Temperature sensor in the development of the smart refrigerator

Original Six door refrigerator received attention, which is equipped with a new generation of vacuum chamber refrigerator , while the new intelligent vacuum ice greenhouse according to different vegetables, fish and other food ingredients , automatic switching optimal preservation temperature 1 ℃ / -1 ℃ , the eliminating the need for manual adjustment of trouble, easy to enjoy healthy and delicious .Especially in terms of energy saving , a refrigerator dedicated power saving procedure in the case of food preservation does not affect the cooling intensity is slightly weak tone , while the control speed of the compressor . Open the refrigerator door is usually the voice prompts after 1 minute will be shortened to 30 seconds after the prompt , and the LED lights inside the refrigerator will be prompted by the lights dimmed refrigerator door closed as soon as possible . Intelligent memory analysis , and by Camshaft Position Sensor of the refrigerator door opening and closing frequency analysis using household usage, no other family members at night or infrequently used defrost heater operation period , in the period of high frequency , inhibiting due to temperature rise caused by the defrost heater .It is reported that the temperature sensor in the refrigerator works is this : decide whether to open the compressor according to the temperature of the refrigerator and freezer cases , if the freezer temperature is too high , then open the electromagnetic popular V1, close the valve V2, V3, open at the compressor , high temperature high pressure superheated condensed through the condenser , dry filter and dried down the capillary orifice tube , refrigerant vaporized in an evaporator to produce low-pressure low-temperature drying gas . Flows into the refrigerator compartment through the solenoid valves V1 , so rapidly reducing the temperature of the refrigerator , when the compressor temperature reaches the required closed while closing the electromagnetic valve V1. If the freezer temperature is too high , you should open the V2 closed V1, V3. Solenoid valve V3 is mainly used for defrosting the freezer . V3 of the need to open the box , passing through the freezing chamber can be uniform vaporization frost freezer compartment temperature from the compressor outflow pressure gas . To achieve the effect of frost . Generalized frost shorter time , otherwise it will hurt the stored food .Essential quality refrigerator Auto Temperature Sensor performance , and its identification as follows: Since the refrigerator temperature sensor series negative temperature coefficient thermistor , so we can measure the resistance change using the " hand method ." When the hand grip temperature sensor , its resistance varies with temperature , normal to tens of thousands of European Euro . After the hand release , its resistance and recovery. If the holding temperature sensor , the resistance change, or a small range of variation , the temperature sensor is defective and should be replaced.

Automatic building control in sensor applications

For BAS many physical scene is from the sensor to convert to electricity , and then processed ; If you want a variety of power, such as voltage , current, power and frequency converted to a standard analog output signal , to use electricity transmitter . Building automation systems commonly used Crankcase Position Sensor are temperature sensors, humidity sensors, pressure sensors , pressure sensors, antifreeze switches, flow switches , liquid level switchesReal-time monitoring and control system is the control sensor data sources , its stability and accuracy, and precision control results directly affect the control system , but also affect the energy consumption of electrical and mechanical equipment in the building . Engine Water Temperature Sensor selection , the need to measure real-time physical data collected species live , the sensor requires environment , DDC acceptable signal type, measurement range and accuracy , and many other factors to consider . Different measurement objects are: water , steam, air , etc. : Request environment : indoor , air duct, watercourses and so on. Here are several common sensor :Common temperature sensor, temperature sensor for measuring the temperature of the scene . Installation form: indoor and outdoor , duct , immersion , flue type, surface type and so on. Common temperature sensor elements are: silicon material , nickel thermal resistance, heat resistance training , thermal power suits, these elements connected in a bridge -type , once the temperature changes , the bridge voltage signals detected. Since the application on different occasions , the humidity sensor is also divided into common type , the transmission signal indoor, outdoor , duct and also includes an analog signal , such as waterways , common sensing element with platinum resistance, thermal resistance.Humidity sensors are used to measure air humidity. Installation forms are also within the premises , outdoor , duct type. Such capacitive sensors such as humidity sensor , temperature changes caused by changes in the capacitance value , the change signal may be sent. Also a loose polymer resistive humidity sensor measuring element. When the humidity sensor in the air relative humidity , the output signal is generally an analog signal output by the transmitter .

The role of regulating the temperature sensor ? From the pressure cooker ? The electric

Average family pet ? Standing the fog ? 's Is a pressure cooker ? Oe rice cooker , pressure cooker ? Him, but because many No 's have a temperature sensor installed will result in incorrect temperature , of course , in use No to be very safe . Pressure cooker ? Uses the power is ? The temperature sensor of the newly developed product to replace ? From the pressure cooker ? Oe traditional rice cooker .With the rapid development of the temperature sensor industry , ordinary people can study new Crankshaft Position Sensor thermostat adjustable pressure cooker ? 's Electric . This apparatus can continuously adjust the press ? OAS temperature to 100 degrees paragraph can be adjusted continuously , and when more than 100 degrees, can be adjusted continuously. Cook different food choices based on different temperature and pressure ? Es , both to keep the food delicious , but also to save time , energy, security ? Her.Pressure cooker ? 's Generally usually causes the pressure ? Hits a certain level , and other devices through the pressure relief valve ? 's , When steam is discharged , to ensure safe use . The new pressure cooker ? Sealed during the whole process of heating without boiling . the maximum temperature of Engine Water Temperature Sensor may be provided to control the pressure cooker ? electrical under pressure ? limiting the ac ? valve corresponding to the pressure ? nominal boiling point of ? the water regardless of what adjust the temperature , water No boil in the pressure cooker ? 's electric , steam No the leak, en ? there the noise.Factors in the autoclave in the cooking process of food , play a key role in the press ? The steam , vapor , water temperature and cooking time in which the pressure ? The water vapor n ? The ? The directly controlled , but the size press ? the vapor of water vapor , the water temperature has an inherent contact , the electrical or electromagnetic heating, etc. , precise control of steam, the water temperature to control the pressure ? the steam then adequate control of the heating time , the oven can be controlled with precision ? 's to achieve the objective of the temperature sensor . Making use of a new type of temperature sensors , pressure cookers ? Can adjust the cooking temperature . For the safest cooking process , time saving , energy saving , cooking delicious food .

What sensor engineering test requirements

Engineering Test sensor What are the requirements ? Sensor like human sensory organs, we can imagine its importance , so that the process of selection of test sensors is very critical.

First, the technical performance requirements of engineering tests on the sensor , Car Temperature Sensor output of the physical object to be measured is converted into an electrical signal surgery performance following requirements: high sensitivity, wide linear range ; quick response , after fishing , drift ; output signal to noise ratio times high ; stability , good repeatability ; good dynamic performance ; loading effect is low.

Followed by the selection principle of the sensor is divided into several, according to the measurement mode selected in engineering test against working conditions, work the measured object , choose different measurement methods . If contact with the non-contact measurement ; destruction and non-destructive measurement ; online and offline measurement. Different measurement methods , the selected Shaft Position Sensor is also different. For non- contact measurement , the choice of capacitive, eddy current non -contact sensor is more appropriate. For non- destructive measurement that is non-destructive testing , use of ultrasonic , acoustic emission sensors, such as more convenient. Choose different measurement requirements according to the requirements of the selected sensor measurement is not the same . Such as eddy current displacement sensors and variable capacitance sensor pole pitch , are non- contact measurement of micro-displacement sensor , although the sensitivity of the former without the latter is high, but the stability of the former better than the latter. Thus , we must consider the selection of the specific measurement requirements . By using the method of election , breed quickly sensing technology developed in recent years , the sensor specifications very numerous. Every year, many new sensor types appear , which provides a lot of convenience for the selection of the sensor. When selected , requires easy to use as possible , even in the installation, commissioning and maintenance. For example , the rotary shaft of the test structure used with the touch sensor needs to use slip rings or telemetry device , and the use of non-contact sensor is more convenient.

Humidity sensor has the following characteristics

Humidity sensor has the following characteristic1 , precision accuracy and long term stability of the humidity sensor should reach ± 2% ~ ± 5% RH, hard to reach this level of use as measuring instruments , humidity sensors to achieve ± 2% ~ ± 3% RH accuracy is relatively difficult, given the characteristics of the product information usually is at room temperature (20 ℃ ± 10 ℃) and the clean gas measurement. In actual use, due to dust, oil slicks and harmful gases , use over time may deteriorate accuracy down to the level of accuracy of the humidity Crankshaft Positioning Sensor to determine the long-term stability of their combination , in general , and the use of long-term stability life is a top issue affecting the quality of the humidity sensor , the annual shift of control in 1% RH level products rarely , usually within ± 2% , or even higher.
2, the temperature coefficient of the humidity sensor and humidity sensor in addition to the environmental moisture-sensitive , but also sensitive to temperature , the temperature coefficient is generally in the 0.2 ~ 0.8% RH / ℃ range, and some of the humidity sensor at different relative humidity , there are differences in temperature coefficient . Drift nonlinearity, which requires additional temperature compensation in the circuit. Humidity Crankshaft Positioning Sensor using SCM software compensation , with or without temperature compensation is not guarantee the accuracy of the whole temperature range , the linearization curves humidity sensor drift compensation directly affect the results , nonlinear drift compensation is often no better results only the use of hardware temperature compensation will obtain the true follower of the compensation effect . Humidity sensor operating temperature range is also an important parameter. Most humidity sensor is difficult to work in more than 40 ℃.
3 , when applying a direct voltage supply of metal oxide ceramic humidity sensors , and polymer materials such as lithium chloride humidity will cause performance changes, or even fail , so these can not be the humidity sensor with a DC voltage or a DC component AC voltage. Must be AC powered.
4 , interchangeability Currently , the humidity sensor interchangeability difference in the prevalence of the phenomenon , the same type of sensor is not interchangeable , seriously affected the results, to maintenance, testing increased the difficulty , some manufacturers have made efforts in this regard , ( but still very poor interchangeability ) achieved good results .
5 , the humidity correction correction correction temperature and humidity is much more difficult than that . Temperature calibration is often used as a standard to a standard thermometer , and humidity calibration standard is more difficult to achieve , wet and dry bulb thermometer and hygrometer some common pointer is not used for calibration , the accuracy can not be guaranteed , because of its environmental requirements very stringent conditions are , in general , ( preferably under conditions suitable humidity ) in the absence of the test sound device , usually a saturated salt solution with a simple test method , and the measured temperature.

Sensor characteristics

Sensor means able to feel a predetermined physical quantity , according to certain rules to convert the device or the device may be the input signal. Simply put , the non-power Engine Water Temperature Sensor is converted into electricity devices.
Sensor sensitive element usually consists of the conversion element and the measuring circuit of three parts .
1 ) , can feel the sensitive element is the direct ( or response ) was measured part , is about to be measured by conversion into the sensitive element of the Car Temperature Sensor has to be measured to determine the relationship of non-electricity or other amount .
2 ) , then the above-mentioned non-electricity conversion device converts electrical parameters .
3 ) , the effect of the measurement circuit is to convert the electrical parameters of the input element is processed into a voltage , current or power frequency can be measured in order to display, record , control and processing section.

Speed ​​Sensor

Electric vehicle speed sensor is more important sensors are also more sensor applications. By definition , speed sensors are used to measure the speed sensor is divided into speed sensor, speed sensor, wheel speed sensors. Speed ​​Crankshaft Sensor Replacement are used for electric cars motor rotation speed is detected. There are three commonly used speed sensor , namely electromagnetic induction speed sensor , speed sensor photoelectric sensors , Hall-effect speed sensor , are using non-contact measuring principle, in order to enhance detection of security, improve the detection accuracy . The vehicle speed sensor for measuring the speed of electric cars . Speed Car Temperature Sensor signal is mainly used for the dashboard speedometer display and the engine idling , the electric vehicle acceleration during the control. Currently the vast majority of China's electric car speedometer on a car forum selection are converted into speed speed speed of the car . In the case of this car braking , skidding , and the forum because of old and new , friction , road , tire pressure , etc., causing the outer circumference of the level of change will cause the error is too large , or even not work , there are electromagnetic induction speed sensor , photoelectric type, variable reluctance and Hall -style concentration. Generally using electromagnetic induction and the Hall speed sensor on electric vehicles.

How to use the temperature sensor to the motor, to control the motor start and stop

The temperature sensor is generally a thermocouple type, directly connected tothe input end of the controller can be, about a hundred block controller can buydigital display type, it can be a temperature calibration, can set the temperaturecontrol point, Cooling Temperature Sensorsee the manual controller can be, generally have one or twoindependent contact (normally open and normally closed), contact power Car Temperature Sensorsupplycontactor coil power by temperature controller, it can control the motor, if you are using a single-phase motor, power is small, even can directly to the power supply via a temperature controller contact power supply to the motor.

Motor comes with temperature sensor

General 220V motor or transformer with a PTC device controller, this element isbound in the bridge line of stator winding temperature of Coolant Temperature Sensor60 degrees, the general election, the motor winding temperature exceeds the value of the element isautomatically disconnected, and then the lead wire is connected with the control circuit, the effective protection of large motor, but not found have installed,because in the circuit has a thermal relay protection will be delayed for a period ofprotection, motor Car Temperature Sensoroverload, if you installed him, occasionally a pulse will cause the motor to stop rotating, actually does not affect the normal operation of the motor,in a complete chain circuit will result in The loss outweighs the gain. effect. If you want to monitor the motor temperature, a temperature detection facilities.

Ran

Ultrasonic sensors and sonar sensor is a sensor that you

Sonar sensors directly detect and identify underwater objects and underwater contours , sonar sensor sends an acoustic signal , when faced with an object will reflect back and wave reflection time basis to calculate its distance and position of the ultrasonic Crank Shaft Position Sensoris the use of ultrasound characteristics developed from the sensors. Ultrasound is a mechanical vibration frequency higher than the acoustic waves from the transducer excitation voltage wafer vibration occurs , and it has high frequency, wave length, the diffraction of small, especially good directivity , to be directed rays propagation characteristics. Sonar Coolant Temperature Sensor are used to detect biological , such as what is used to detect underwater creatures, biological body much like. Often ask you heard a device for detecting monsters that sonar sensors. Ultrasound for liquids, solids penetration ability is high, particularly in the sun opaque solid , which penetrate the depth of tens of meters . Ultrasonic encounter impurities or sub- interface will produce significant reflex reflector formed into echo , hit moving objects can produce Doppler effect. Therefore, ultrasonic testing is widely used in industrial, defense , biomedical and other aspects . Ultrasonic sensors are developed from the use of ultrasonic sensor characteristics . In industry, the typical application of ultrasonic NDT and metal ultrasonic thickness two kinds . Ultrasonic sensors in medical applications primarily to diagnose disease , it has become an indispensable clinical diagnostic methods . Ultrasonic position sensing sensors can resolve the difficulties encountered , any material capable of detecting the target object . These products can be in a dry, dusty environment of normal operation. Target object presence detection , accurate distance measurements or traces. In other detection techniques in times of difficulties , and more able to demonstrate the superiority of the product , for example, when the object to be detected as follows : clean or luminous object , mist or gas filled objects , spraying of liquids.

Flush diaphragm pressure sensor liquid level sensor is an extension

We heard flush diaphragm type pressure sensor, but seldom hear flush diaphragm type liquid level sensor inputs , in fact, if we can understand the pressure Car Temperature Sensor and level sensors relationship , think flush diaphragm type liquid level sensor is not surprising , in fact, flush diaphragm type liquid level sensor and flush diaphragm pressure sensor is the same reason .

Flush diaphragm type liquid level sensor uses 316 stainless steel full seal welded , compact, compact , good moisture resistance and excellent media compatibility. Diaphragm -type liquid level Coolant Temperature Sensor are generally more applications in the medical industry , the industry also has a certain application , widely used in metallurgy , chemical industry, food and beverage, fruit juice, canned food, granular flow , consistency large , high viscosity liquid height measurements.

Flush diaphragm level sensor prices are generally more expensive , this is understandable, because flush diaphragm type pressure sensor pressure sensor than the average price should be much more expensive , so flush diaphragm type liquid level sensor price than the price of an ordinary pressure sensors much more expensive , generally in about 2-3 times look.

As technology advances , more and more manufacturers will produce flush diaphragm type sensor , once the supply and demand imbalance , when flush diaphragm type liquid level sensor also with the price change, and flush diaphragm lower level sensor is based on a new class of products for the market.

How to install vibration velocity sensors

Speed ​​sensor vibration velocity sensor , the vibration velocity is typically used to measure the vibration of the bearing , but there are a few cases in the shaft for measuring vibrations. How to install vibration velocity sensors do ? In the measurement of vibration velocity , if sensor is installed incorrectly or is not securely installed , themeasurement results will cause distortion due to vibration or damage caused by the speed sensor . So we
have to consider a good choice for vibration velocity sensor is installed. When the speed sensor is used to measure shaft vibration when installed in the field are usually taken with the hand , sticky water plasticine magnetic disk fixed , bolted in several ways . In the temporary vibration measurement , in most cases, hand sensors way , this method measured flexible , easy to use , especially when the number of the lack of vibration velocity sensors and sensor interchangeability bad, has a special advantage ; And this the disadvantage is that the test measurement error is relatively large, and the intensity of work is relatively large . Current speed sensor when measuring the vibration velocity , usually people will use Auto Temperature Sensor fixing screws directly on the bearing , not only can reliably measure the bearing at the top of the vibration in three directions , but also can be measured in two directions perpendicular to the plane of vibration this method is the best way to install the measure . Also has a different installation methods , due to the installation of the various conditions to determine that we have a good effect on manually installing a useful little plasticine paste Crankcase Position Sensor is also more convenient , you need to note that plasticine vibration velocity sensors can not be pasted into the vertical plane , and can only be fixed on a horizontal surface , as affected by temperature adhesive force , high temperature and the lower the adhesive strength will be significantly reduced, so it is not suitable for fixing the high temperature high pressure turbine rotor and reel measuring wheel speed Crankshaft Positioning Sensor bearing ; winter cold start , the bearing temperature is too low and it is not used . There is a similar permanent magnet sucker fixed speed sensor mounting , etc., when we observe the installation follow the rules is to measure the needs , the need to make sense of your environment changes , so that the vibration velocity sensor mounted only purpose is to more has the effect of reducing unnecessary errors.

What are static load cell features

The operating characteristics of the sensor by means of its static and dynamic characteristics reflected directly measuring system input is not constant over time and the system is present between the input and output static characteristics is the relationship . The static characteristics of the weighing sensor is divided into five parts. - Weighing Sensor Static One is repeatability, reproducibility refers to the so-called sensor input for full scale in the same direction repeatedly changed, the resulting curve degree of inconsistency . In those who are weighing sensor sensitivity and linearity, sensitivity sensor static characteristics is an important indicator . Which is defined as the amount of output incrementincrement causes the ratio of the corresponding input increment . S is a sensitivity. The linearity of the sensor is output and input of the actual relationship between the degree of the curve -fit straight line deviation . Defined as the whole range of the actual characteristic curve and the maximum deviation between the fitted line with the full-scale value of theratio of the output value . Static characteristics of the load cell is important to drift, the same amount of the input , Crankshaft Sensor output varies with time , this phenomenon is called drift, and other similar weighing sensor drift mainly generated by Car Temperature Sensor is the sensor their structural parameters and application ambient temperature , humidity and other effects .Weighing sensor input changes from small to large and from large to small input and output characteristic curve during the input phenomenon does not overlap a static characteristic is the sensor end , the input signal for the same size , Motor Position Sensor output signal of the positive and negative stroke not of equal size , this difference is called hysteresis difference . - Static characteristics of the load cell refers to the static input signal , the output of the load cell and the input of a relationship between . Because when both input and output , and time-independent , so that the relationship between them , the static characteristics of the load cell can be a free time variable algebraic equations , or-axisinput,theoutputofitscorresponding volume plotted as the ordinate andcharacteristic curvesdescribed.Characterization of the sensor static characteristics of the main parametersare:repeatability, sensitivity, linearity. Then the impact of the load cell measuring effects and selection of the key elements of that is that a few key points

How long can the displacement sensor life

We live in an age of advanced science and technology , should be carried out in various fields necessary for detection and analysis . Displacement sensor applications are increasingly widespread . That how to make it last longer displacement sensor ? Both methods are based on the piezoelectric power generator , a micro- electromechanical systems (MEMS) cantilever converted into electrical energy to mechanical motion , and the motion of the cantilever can be driven in different ways . One is with a radioisotope , and another vibrationcollected with the environment . All self-powered communication nodes must maintain their memory state , periodically send its status . This requires 0.1 microwatts to 1 milliwatt of power. Cornell University researchers with a small amount of nickel -63 (Ni-63) to join its radioisotope neutrons in the nucleus made ​​of a piezoelectric generator. It can be a beta particle radiation harmless to maintain every 3 minutes 5mW RF pulses . Up to 100 years of its life . Netherlands an Imac nanoelectronics research center created a wireless , autonomous temperaturesensor. Nitrogen compound aluminum vibration collector. Displacement vibration energy collected by Shaft Position Sensor generally require a specific vibration frequency of 1 micron . The sensor can measure
the temperature every 15 seconds , and the data to the base station of more than 15 m . However, the sensor can not be packaged under atmospheric pressure , vacuum packaging in order to be up to 85 micro watts. Both programs are considered to be the original innovation, especially in the industrial sector after promising a program that is promising . This reminds me of the importance of interdisciplinary . In China, it was also studied low -power sensors,self-powered sensors, Crank Position Sensors nodes. However, people were asked to engage in computer power plus local power control , engage people to lower the voltage electronics , modify the circuit , who were asked to engage in strategic research needs of people who engage inmaterial made ​​of certain materials CMOS process modifications . All of these ideas are good , that is, as stated above do not form a Camshaft Position Sensorsolutions and experimentally demonstrate its feasibility. Our old gave me a feeling of floating on top , or nowhere near enough analogy something more , something to talk about on paper more. Recently, I reviewed adomestic article about software fault tolerance. His talk about the real software fault-tolerant technology, but between the methods to study various software fault-tolerant scheduling algorithm . You did not study a software fault-tolerant way , how do you choose , scheduling it ? On paper can only be empty talk

For you to resolve the five sensor software technology

Digital sensor has a strong anti-interference ability , signal transmission distance , goodstability of these advantages, because it is being used to digital information technology into the sensor , and Cooling Temp Sensor software technology levels are therefore plays an important role inside . Under normal circumstances we have five kinds of software technology , give you a brief introduction below : scale conversion technologies: analog signal by the analog-digital conversion obtained after a series of digital , it must be converted with dimensionless data to calculate , display, which need to use scale conversion technologies. Digital zeroing technique : using a variety of procedures to achieve zero drift , gain, offsetcalibration drift . Digital filtering techniques : Car Temperature Sensor analog output signal, the analog-digital conversion into the microprocessor , the normally sharp pulse entering into therandom noise and the like , must be weakened and filter , the digital filter technology to solve this shortcoming . Temperature compensation : Expression temperature established mathematical model , with the difference between the other mathematical processing method , temperature compensation can be effectively achieved , depending on the effect of temperature on Auto Temperature Sensor output size. Nonlinear compensation technique : the measured characteristic curve, piecewise interpolation , if the interpolation points is reasonable and sufficient , excellent linearity can be obtained . Integrated use of these five sensor software technology , for the design of the sensor is also helpful, software is the core, the hardware is the foundation, both have to take into account

Sensor type and application conditions , you should follow the recommended calibration method

The method of calibration . Taking into account all the factors , such as sensor type and application conditions , you should follow the recommended calibration method : According to the operator's judgment , gas sensors surrounding gas is fresh , there is no abnormalcondition exists , then, the instrument indication near zero ( reading ) , zero setting process can be skipped. When in doubt , use a plastic bag aroundCamshaft Position Sensor to get some considered to be " fresh " air. This is a very quick and easy process . This method for the difference between true and false alarm warning is very effective . There is an advantage that the compressed air , the gas in the bottle is easy to control and easy to carry . The device is easy and convenient to get air . Such a small amount of air in the meaning of hydrogen and nitrogen , carbon monoxide , carbon dioxide and some other interfering gases . However , this gas is characterized by low humidity , the solution used in the sampling system with activated carbon filters are used to filter out unwanted wet gas in the gas and water vapor. After this process , we can use the gas for various types Car Temperature Sensor calibration . However, it should be noted that carbon monoxide gas and not through a filter with activated carbon and filtered . Therefore, the rule states: cylinders of carbon monoxide gas with the surrounding environment must be the same content . In addition , the use of soda ash filter can filter out carbon monoxide. Since the sampling system using the soda ash line filter can filter out although an oxygen gas is usually very pure man , but it can not be used for solid-state Engine Water Temperature Sensor and
photoionization detectors, because such sensors require the gas contained in the sampling some water vapor. A simple way to solve this problem is to use the sampling system pipeline damp tissue paper . Its role is to make the wet stream sample , the sensor has sufficient water vapor. Another option of using NAFION tube

Explosion-proof sensor works is what Source: Sai Siwei Posted at 2013-6-25 Sensor Networks

For the use of sensors in explosive situations , in order to avoid an explosion, usually chosen with explosion-proof requirements. Explosion-proof sensor has the following three main methods , namely, control explosive gases, control limits and control detonated explosive source following these three methods work done under a brief introduction : 1, control explosive gas works in a sealed explosion-proof cabinets , full of clean gas without explosive gas or inert gas , and keep the box outside the box pressure slightly above atmospheric pressure , the sensor is installed in the box . Type represents a positive pressure -proof method Exp. 2, the control principle is based on the explosion limits Exd GB , Crank Position Sensor housing is designed to flameproof standard housing , instrument design standards by flameproof housing , according to standard sternly design, manufacture and assembly of all management approach to the implementation process , within the housing so that the explosive attack risk Buzhi Yu stimulate housing outer gas explosion. Explosion -proof approach to the design and manufacturing standards extremely harsh, and assembly, wiring and maintenance procedures are very strict. The approach determines the flameproof electrical equipment , instrumentation often very strict operation should power outages , etc., but many cases are also the most useful approach. 3, the control detonation source works by applying barrier to isolate wiring from Engine Temperature Sensors is processed in electricity distribution , will be supplied to the electric field sensors energy can neither be restricted enough to detonate a spark occurs , the instrument can happen enough to detonate exterior temperature rise within safe limits . In accordance with international norms and norms of the country , when the safe side of the gate area of the connected equipment safely attack any obstacle , the real safe way to ensure that the risk -site explosion -proof safe. Need to remind you to consider in choosing the sensor due to the use of different occasions and configuration , on-demand options intrinsically safe , explosion-proof Crankshaft Positioning Sensor and instrumentation , but also to the supplier needs to Ex- certification.

Dynamic torque sensor installation

Dynamic torque sensor installation:1, the use of the environment: Car Sensors should be installed in an ambient temperature of 0 ℃ ~ 60 ℃, relative humidity less than 90%, non-flammable and explosive chemicals environment. Should not be installed in the strong electromagnetic interference in the environment. 2, Installation: (1) Horizontal mounting: (2) vertical mounting: 3, Connection: Engine Water Temperature Sensor with power equipment, the connection between the load equipment (1) flexible pin coupling connection, this connection structure simple, easy processing, easy maintenance. Trace caused to compensate for shaft misalignment relative offset, and can play a minor role in damping. For medium load, high-speed operation starting Car Temperature Sensor, the working temperature -20-70 ℃. (2) rigid coupling connection which forms a simple structure, low cost, no compensation performance, not buffer damping of high mounting accuracy of the two axes. For vibration small working conditions.

Introduction and use of pressure sensors Precautions

In daily life use and purchase pressure sensors require all it has a certain understanding, particularly when in use, if there is no understanding of good note, it is easy to cause the machine to malfunction or damage to the sensor from occurring, or is causing measurement accuracy decreased or even data is wrong. Pressure sensors, that is, when sensing the pressure, the pressure can be utilized to convert the sensor output signal, which is based on this principle manufactured piezoelectric effect, generally, piezoelectric sensors can measure only dynamic pressure can not be applied in a static measurement occasions, this is because when subjected to mechanical force generated when the role of the charge only in the loop when it has infinite input resistance, this time can be preserved. In everyday industrial practice, Engine Temp Sensor has become a very widely used sensors, many industries in order to control quality of the environment inside, have invested heavily use it. Polarization effect of the pressure sensor is based on developed. Well, this polarization effect is how it goes? Crystal, I believe we are all familiar with it. Crystals are anisotropic, not a crystal it is isotropic. When a crystal of some media in a certain direction by the action of mechanical force causing it to change the shape of, this will form a polarization effect . When the mechanical external force disappears, the crystal will return to the original uncharged state. The so-called polarization effect refers to the time when subjected to mechanical force, a number will appear inside the crystal or live effectMany industries in the use of Camshaft Positioning Sensor unit when there will be a big problem, so you understand it well before using in the course of matters that need attention. First, to avoid corrosion and temperature transmitter with having contact with the medium in order to avoid excessive damage to it; pressure guide tube mounting position preferably in the temperature fluctuations smaller occasions; in the measurement of some of the media has a high temperature, it must be connected to the condenser, it is because you want to avoid the transmitter to work when the temperature exceeds a certain limit; want to keep the catheter in the unobstructed; when used in the cold winter, if the transmitter is installed outdoors, then have a good antifreeze measures be taken, which is to prevent impulse mouth for the sake of the liquid causes freezing because its volume swell up, so easy to damage the sensor; when the user terminal, the cable should wear over waterproof connector or is it about sex tube and then sealed to tighten the nut, it is possible to prevent liquid from leaking into these things through the cables inside the housing of the transmitter. Now speaking about the measurement of liquid pressure and gas pressure precautions, we have to distinguish clearly. Measuring fluid pressure, when the pressure taps must be open in the flow line where the side surface, which is to prevent dross precipitated sake, there is installed at this time where the transmitter should prevent other liquids, shock, because Cooling Temperature Sensor excessive damage. In the measurement of gas pressure when the pressure port must be open in the top position of the pipeline process, note that this is the time with the measuring fluid pressure difference, then the transmitter must be installed in the upper part of the process piping, which is convenient have accumulated liquid may be easily injected into the flow line to go .....

The advantage of digital load cell

First, the transmission distance, communication speed, the effect is significant anti-cheating traditional analog load cell output signal is small , typically millivolts during transmission due to cable resistance effects , there is loss of signal , but also susceptible to ambient interference , it is not for long-distance transmission. Its signal cheating a lot, usually difficult to control. The digital load cell signal output is digital, not only a high level , the impact of interference is very small, and it is the use of field bus technology, communication speed is super fast , but also with a communication error correction function, due to the confidentiality of communications protocols , cheating is basically impossible , so get a high data reliability . Second, anti-interference ability , high reliability, good lightning performance analog sensor output from the instrument power supply , power quality affected by the instrument . Between them susceptible to electromagnetic interference and surges. Instability of the power supply of Shaft Position Sensor output is also great, likely to cause instability in the output , the high voltage transient will cause the sensor damage. Digital sensor with a new welding manufacturing technology, which is also filled with helium safety protection circuit , a very high degree of protection . In order to prevent lightning surge interference , which uses the output voltage of the instrument reprocessing meet the sensor supply voltage requirements , so that the output signal becomes stable , the sensor will not be damaged . Three , eliminating calibrated load cell to get the scene, there is no suitable counterweight system calibration is generally difficult , if not then its calibration , the error will be great. Engine Coolant Temp Sensor during the live connection has loss, so must be carried out on-site calibration . And now digital sensors can dispense the job , because it has been used in the production of standard dynamometer was calibrated , and its output is the corresponding standard values ​​. Since it does not substantially project in the transmission loss, so the read value is the actual measurement value , so it can save the calibration of the link. Fourth, you can work uninterrupted digital sensor error function it has a fault , once fails, it will output the signal to the instrument , the instrument signal is received , you can abandon its value , to automatically start uninterrupted work, can still guarantee a certain accuracy , the user can always know which sensor needs to be replaced , will not cause the production stagnant . Coolant Temperature Sensor can not meet that requirement , once the fault will cause production downtime , affecting plant efficiency. Five , easy maintenance, low overall cost of using digital load cell with a standard cable plug, both to ensure the protection level, and the replacement of the sensor or the cable is very convenient, but because of its digital output , without the impact of cable length . The analog temperature compensation of the sensor it is together with the cable , the cable will be connected after damage caused by errors , so many sensors are connected together with cable , replacement when it need to re- stringing , very inconvenient to use . It now appears that , although the digital sensor more than analog sensor circuit board , but not in the course of calibration , commissioning time will be greatly reduced , higher reliability , but also has a self- diagnostic function, can not be shut down for some production units , it also ensures uninterrupted work , saving production costs, so in general, it uses the overall cost is lower than the analog sensors .

How to select the flow sensor

Liquid density sensor means can feel liquid density , and it can be converted into an output signal that can be used sensors, liquid density sensor can be divided into six categories: capacitive, ultrasonic , tuning fork , resonant , radiation type and vibrating tube liquid Shaft Position Sensor . Capacitive liquid density sensors it is not based on the same liquid sample , the standard different buoyancy body , this will lead to an object connected with standard two capacitance change in the distance between the plates , and resultant capacitance changed. Because different liquid density sensor for different occasions , so in practical application , it should be depending on the nature of the liquid to be measured also on the measurement accuracy requirements, and so the situation and the choice of suitable sensors. Ultrasonic Density sensors it is higher than the frequency of the ultrasonic mechanical waves of 20kHz and an ultrasonic wave only may be in the form of propagation in a liquid medium . It is for the phase , frequency, speed and attenuation properties of the medium will be subject to impact , so, it can be based on the ultrasonic propagation properties and some of the correspondence between the density of the liquid to measure the density of the liquid . Its main advantages are: it can achieve non-contact measurement, the measurement accuracy is relatively high, relatively fast response ; and it has no moving parts , so the stability of the measurement is better ; it is not radioactive , there is no harm to the human body . The disadvantage is that there are impurities in the liquid medium , for example , bubble can lead to severe attenuation of the ultrasonic signal ; precision measurements in viscous media , the need to consider the impact of medium viscosity ; it will make some measurements lead to instability .Auto Temperature Sensor it is based on the liquid density in the liquid , the mass of small tuning fork vibrates, its inherent frequency change , so to measure the density of the liquid . To obtain high accuracy measurement results , it is necessary to detect the resonant frequency when the change is small , it is necessary to design rational vibrating unit , so that the vibration unit can be a relatively high mechanical quality factor . Fork usually made ​​of glass or stainless steel . Resonant resonant liquid density sensor measuring principle is based on the vibration characteristics of a harmonic oscillator to work . In operation, the resonator can be equivalently used as a single degree of freedom system , with the natural frequency of the vibration , the natural frequency of the system with the system is only the equivalent elastic modulus and the equivalent mass . Resonant liquid density sensor measuring principle is the liquid through the system and the elastic contact with sensitive components cause changes in the system of equivalent mass , resulting in changes in the natural frequency of the system . Measuring system according to a fixed frequency variation can know the density of the liquid to be measured . Liquid Density Sensor ray rays Liquid Density Sensor The main disadvantages are: it is not very high resolution ; it needs a relatively long time have stability ; It requires radioactive ray source . Its advantages are: the liquid flow sensor does not generate resistance to the flow size is not limited, and it can measure the density of the multiphase fluid ; when it is not in contact with the measurement of the liquid under test , it can be realized non-contact measurement . Liquid Cooling Temperature Sensor vibrating tube vibrating tube type liquid density sensor can reasonably be arranged drive member , to allow the inside tube vibration in the same plane , it is the measured density of the liquid flowing in the tube the average mass density . The sensitive element is that it uses a long tube vibration , its length is about 20 times the diameter .

How to install vibration velocity sensors

Speed ​​sensor vibration velocity sensor , the vibration velocity is typically used to measure the vibration of the bearing , but there are a few cases in the shaft for measuring vibrations. How to install vibration velocity sensors do ? In the measurement of vibration velocity , if sensor is installed incorrectly or is not securely installed , the measurement results will cause distortion due to vibration or damage caused by the speed sensor . So we have to consider a good choice for vibration velocity sensor is installed. When the speed sensor is used to measure shaft vibration when installed in the field are usually taken with the hand , sticky water plasticine magnetic disk fixed , bolted in several ways . In the temporary vibration measurement , in most cases, hand sensors way , this method measured flexible , easy to use , especially when the number of the lack of vibration velocity sensors Engine Temperature Sensor interchangeability bad, has a special advantage ; And this the disadvantage is that the test measurement error is relatively large, and the intensity of work is relatively large . Current speed sensor when measuring the vibration velocity , usually people will use Engine Temp Sensor fixing screws directly on the bearing , not only can reliably measure the bearing at the top of the vibration in three directions , but also can be measured in two directions perpendicular to the plane of vibration this method is the best way to install the measure . Also has a different installation methods , due to the installation of the various conditions to determine that we have a good effect on manually installing a useful little plasticine paste the speed sensor is also more convenient , you need to note that plasticine vibration velocity sensors can not be pasted into the vertical plane , and can only be fixed on a horizontal surface , as affected by temperature adhesive force , high temperature and the lower the adhesive strength will be significantly reduced, so it is not suitable for fixing the high temperature high pressure turbine rotor and reel measuring wheel Car Temperature Sensor bearing ; winter cold start , the bearing temperature is too low and it is not used . There is a similar permanent magnet sucker fixed speed sensor mounting , etc., when we observe the installation follow the rules is to measure the needs , the need to make sense of your environment changes , so that the vibration velocity sensor mounted only purpose is to more has the effect of reducing unnecessary errors

What are the application Humidity Sensor

Humidity sensor is able to feel the water vapor content in the gas and used to convert the output signal of the sensor. With the realization of modernization , it is difficult to find a field unrelated to the humidity , the humidity sensor for measuring or controlling the relative humidity of the gas or absolute humidity, dew point and so on. Can indirectly control the temperature . Below its typical application for an introduction. ( A ) in the humidity measurement system application ( a ) below 70 ℃ ( normally at -40 ℃ above ) , if relatively clean environment , the use of polymer sensors, polluting the use of ceramic sensor ( heating washing of regeneration type ) . Heating the cleaning process as it exists , can not be continuously measured , and the large energy consumption (1 ~ 10W). However, long life, use the optional heated sensor clean cycle is longer , such as chlorine oxy apatite Camshaft Positioning Sensor , 2 ~ 3 months wash , in addition, internal heat than the outer heat and low energy consumption . ( 2 ) In the range of 70 ~ 100 ℃ measured humidity , washing with a heating ceramic sensor , to improve the accuracy of linear and temperature compensation. In order to achieve more accuracy will have with the microcomputer. In hot and humid heat required frequent cleaning, such as more than 80% RH , the need to 30S cleansing once daily, preferably equipped with automatic cleaning device heating . ( 3 ) in the range of 100 ~ 150 ℃ humidity measured in the international community , mostly made ​​of ceramic Camshaft Position Sensortemperature and humidity instrument . ( Two ) in the industrial automatic control application process in order to improve product quality and energy , usually in the product drying system , humidity control reactors , boilers, water vapor leak detection, integrated circuits or the head of the air-conditioning plant mostly using ceramic Crankshaft Sensor Replacement control ; variety of air conditioning systems, medical systems and humidity control can be polymeric or ceramic humidity sensor . ( Three ) in a steam leak detection systems used in thermal power stations , nuclear power plants, steam locomotives , boilers and other high temperature and pressure equipment , in order to prevent leakage, prevent accidents , humidity sensor can be used for leak detection . ( Four ) in the other systems used in home appliances dew condensation detection sensor can be used as tape recorders , car windows, condensation , frost detection. Humidity sensor applications driving the need for microelectronic circuit package failure mechanism analysis , due to IC failure and humidity have a great relationship .

How to correctly judge the photoelectric sensor output no signal

Photoelectric sensor is a photoelectric sensor element as a sensing element , widely used in the automation field . Photoelectric sensors for material handling, error detection , process manufacturing automation, object detection can also be used over long distances or fault is detected. Photoelectric sensors detect the distance of the object has a unique advantage , but in the specific use of the environment, there will be some technical problems , which we need methodical technical judgment. In the application of photoelectric sensors to detect objects in the distance , a lot of users will encounter problems when using photoelectric sensors to detect objects is no output signal after , making it impossible for subsequent data analysis. Most people see no signal sensor output may often be some wrong judgment , such as some people on the direct determination of the sensor bad reason. But the reason is not all like that, photoelectric sensor detects an object after no output , there may be many reasons , we need to do it step by step investigation . The first thing to consider is wiring or configuration problems . For beam photoelectric sensor must be cast by the light unit and a light unit used in combination with both ends requires power ; while retroreflective type sensor probe and must be retroreflective sheeting used in combination ; same time, the user must provide a stable power supply to the sensor , if it is DC power supply , you must confirm the positive and negative , should the positive and negative connection error will cause the output signal is not . The reason analysis is to consider photoelectric sensor itself , we also need to consider the problem is to detect the location of objects , if the detected object is not in the detection area , so that the detection is futile. Test object must be detected in the sensor area , that is, can sense the optical range. Secondly, we must consider the optical axis of Crankcase Position Sensor there is no alignment problem , on the radio type of light-emitting portion and a light receiving unit must be aligned with the optical axis , the corresponding portion of the retroreflective Camshaft Position Sensor must be aligned with the optical axis and the reflector . The same should also consider whether the detected object is the standard sensing object or minimum standard sensing object , object detection can not detect an object less than the minimum standard , thus avoiding lead shot , reflective not well detect transparent objects , like a reflection on detecting the color of objects is required, the deeper the color , the more recent detection distance . If the above conditions can be excluded to make it clear , we need to do is to detect environmental disturbances . Such as light intensity can not exceed the rated range ; if there is dust environment of the scene , we need our regular cleaning optical sensor probe surface ; or Crankshaft Position Sensor close fitting , mutual interference ; there is a relatively large impact that electrical interference , if surrounded power equipment , interference must have the appropriate anti-jamming measures . If you have done the above one by one investigation , these factors can be explicitly excluded or no signal output , it is recommended to return factory testing to determine .

On the humidity sensor applications

Currently on the market humidity sensor applications is also increasing. Humidity sensors are used to measure or control the relative humidity of the gas or absolute humidity, dew point and so on. Can indirectly control the temperature . ( A ) in the humidity measurement system application ( a ) below 70 ℃ ( normally at -40 ℃ above ) , if relatively clean environment , the use of polymer sensors, polluting the use of Camshaft Position Sensor ( heating washing of regeneration type ) . Heating the cleaning process as it exists , can not be continuously measured , and the large energy consumption (1 ~ 10W). However, long life, use the optional heated sensor clean cycle is longer , such as chlorine oxy apatite ceramic sensor , 2 ~ 3 months wash , in addition, internal heat than the outer heat and low energy consumption . ( 2 ) In the range of 70 ~ 100 ℃ measured humidity , washing with a heating Engine Coolant Temp Sensor , to improve the accuracy of linear and temperature compensation. In order to achieve more accuracy will have with the microcomputer. In hot and humid heat required frequent cleaning, such as more than 80% RH , the need to 30S cleansing once daily, preferably equipped with automatic cleaning device heating . ( 3 ) in the range of 100 ~ 150 ℃ humidity measured in the international community , mostly made ​​of ceramic Automotive Temperature Sensors temperature and humidity instrument . ( Two ) in the industrial automatic control application process in order to improve product quality and energy , usually in the product drying system , humidity control reactors , boilers, water vapor leak detection, integrated circuits or the head of the air-conditioning plant mostly using ceramic humidity sensor control ; variety of air conditioning systems, medical systems and humidity control can be polymeric or ceramic humidity sensor . ( Three ) in a steam leak detection systems used in thermal power stations , nuclear power plants, steam locomotives , boilers and other high temperature and pressure equipment , in order to prevent leakage, prevent accidents , humidity sensor can be used for leak detection . ( Four ) in the other systems used in home appliances dew condensation detection sensor can be used as tape recorders , car windows, condensation , frost detection.

Automobile engine temperature sensor

Car engine is a one of the most important car , its temperature for a car 's fuel consumption also has a decisive influence . Not to say that high temperatures will fuel more, in fact, the temperature is too low will lead to an increase in fuel consumption . Car engine work required to have normal temperatures ( 80 to 90 ) , Camshaft Positioning Sensor on the engine is particularly important. If the temperature is too high , the engine cooling system can automatically change the cooling water , increase the heat , remove excess heat ; Conversely, reducing the circulation of cooling water to maintain the necessary temperature . To achieve the main components of the cycle automatically change the engine Crankshaft Sensor Replacement, thermostat valve thermostat and magnetic fan. Cold start , the magnetic fan is stopped , the thermostat valve is in the down state , the engine coolant in the engine water jacket only in small cycles , easy to heat , while computers were affected Camshaft Position Sensor temperature index , will be issued to increase fuel injection, increasing the idle valve opening instruction , increase the engine speed is conducive to allow the engine to heat up quickly ; temperature is normal , the fuel injection quantity and idle valve opening are restored to normal. When the temperature exceeds 80 to 90 degrees ( of the vehicle slightly different) , the thermostat valve is opened , the engine water jacket through which coolant flows through the radiator thermostat valves bigger radiator circulation of air generated by the vehicle flow , away a lot of heat , to maintain normal temperature of the coolant . Slow or even stop , but if the speed does not stall , no flow of air to help dissipate heat , the engine will quickly heat up, then issued a directive to the magnetic temperature sensor helps radiator cooling fan starts .

Capacitive oil sensor line

Currently online oil pollution sensor is still in trial stage theory , the use of capacitive measurement method, ie detection software support, integrated by measuring the change in dielectric constant of oil to determine the extent of contaminated oil . Its working principle is: the oil as a dielectric , as new oil, and the oil 's dielectric constant is different when the oil change will cause a change in Crankcase Position Sensor via C / V conversion put this slight change frequency demodulation of the DC signal, the data acquisition circuit samples pre- amplification , A / D converter , sent to the microcontroller after the class consisting of hardware and software data processing system . System based on test data, analysis calculated determination of various types of oil pollution in the upper and lower threshold level target value by including algorithms for intelligent analysis and processing procedures , by the LCD Monitor Report User quantitative ( pollution index value ) and qualitative ( well, available , scrapped ) test results. Because the causes of oil pollution and environmental factors more complex , so the principle of Engine Water Temperature Sensor in the production practice has not been very good application. For example : As the engine piston blow-by , the delay of fuel injection causes the exhaust gas treatment system of exhaust gas into the cylinder , or a leak in the high pressure common rail diesel standard 2 contaminated oil, will cause the viscosity of the oil drop , but the oil dielectric no effect on dielectric constant and density .

Describes the characteristics of the thermocouple temperature sensor

Temperature sensor using the current very high rate in the industrial production , industrial development and use Crankshaft Positioning Sensor is currently running efficiency is very convenient to use the industrial automation , the temperature sensor is currently preferred product the thermocouple , the thermocouple is a a sensor measuring temperature , and thermal resistance are the same as the Camshaft Positioning Sensor , the two different materials a and B conductors or semiconductors welded together to form a closed loop, when two conductors a and B attachment between points 1 and 2 when the temperature difference between the two will generate an electromotive force , and thus forming a loop of current, a phenomenon known thermoelectric effect . Is called the Seebeck effect . Thermocouple probe is to use this effect to work . First, the nature of the signal , the thermal resistance is the resistance itself , temperature changes, the thermal resistor to generate positive or negative change in resistance ; the thermocouple, the induced voltage changes, he is changed with temperature . Second, Engine Water Temperature Sensor detect the temperature range is not the same, the general resistance test temperature range 0-150 ° , the maximum measuring range of up to 600 degrees ( of course, negative temperature can be detected ) . Third, from the material of resistance, which is a metal material having a metallic material changes in temperature-sensitive , bimetallic thermocouple materials , both of two different metals , due to temperature changes in the two wires of two different end generates a potential difference . Four , PLC corresponding thermal resistance and thermocouple input module is not the same , this sentence is not a problem , but generally have direct access to the PLC 4 ~ 20ma signals, and thermal resistance and thermocouple generally with transmitter only access PLC. If you do not have access to the DCS , then use the transmitter up ! Thermal resistance is the RTD signal , thermocouple is TC signal ! Five , PLC also has RTD and Thermocouple modules can be directly input resistance and thermocouple signals. Six , thermocouple J, T, N, K, S and other models , there are specific resistance expensive , there are also cheaper than the resistance , but the count compensation wire , thermocouple total cost will be high .

Barometric altitude sensor Features

Barometric altitude sensor is a change in the use of pressure sensors to measure the height of a. When measuring the height advantage of the processor because of the need to get through a formula to calculate the height values, so in the general election when Shaft Position Sensor output digital signals are used to. HM products mainly used in floor outdoor climbing altimeter GPS positioning tables, outdoor climbing phones, hunting cameras, parachutes, meteorological equipment and other fields. Main features: barometric Auto Temperature Sensor is achieved by changes in air pressure Camshaft Position Sensor to measure the height, so the measurement process from the impact of obstacles, measure the height range, easy to move, can be an absolute altitude measurements and relative height measurements. By pressure and temperature to calculate the height errors are relatively large, especially in the near-surface measurement, by the wind, humidity, dust particles and other effects, a high degree of accuracy of measurement. Very much affected, at high altitude measurement accuracy has improved.

Temperature sensor in the engine room applications

Temperature sensor in the engine room applications, primarily for monitoring a program on the host reaches a certain value after the alarm application program has a great advantage, and spread to a number of areas .
Room temperature and humidity as computer equipment normal operation of the necessary conditions , we must in the engine room of a reasonable location to install temperature and humidity Cooling Temperature Sensor , in order to achieve the temperature and humidity for 24 hours real-time monitoring , and can be in the control room to monitor the host real-time display of each location of temperature and humidity measurements. Once a value in excess of the preset upper and lower limits of temperature and humidity in the monitoring host location by changing the value of the corresponding color alarm . In the overall monitoring of the entire Crankcase Position Sensor and humidity conditions in the new fan inlet and the main air conditioner return air, humidity and temperature transmitters were installed to detect the temperature and humidity. Except for the room temperature and humidity monitoring surveillance , but also can be widely used as bio-pharmaceuticals , sterile room, clean room , telecom banks, libraries , archives, Museum, intelligent buildings and other industries need a place to monitor temperature and humidity and fields. Application advantages open communications protocol, system expansion . Configuration software interface, system stability is guaranteed. Software feature-rich, practical, convenient maintenance and feature upgrades . Using high temperature and humidity transmitter, high accuracy and stability . Digital signal transmission, wiring convenience , the signal transmission distance .

Automobile engine temperature sensor

Car engine is a one of the most important car , its temperature for a car 's fuel consumption also has a decisive influence . Not to say that high temperatures will fuel more, in fact, the temperature is too low will lead to an increase in fuel consumption . Car engine work required to have normal temperatures ( 80 to 90 ) , Coolant Temp Sensor on the engine is particularly important. If the temperature is too high , the engine cooling system can automatically change the cooling water , increase the heat , remove excess heat ; Conversely, reducing the circulation of cooling water to maintain the necessary temperature . To achieve the main components of the cycle automatically change the engine temperature Coolant Temperature Sensor, thermostat valve thermostat and magnetic fan. Cold start , the magnetic fan is stopped , the thermostat valve is in the down state , the engine coolant in the engine water jacket only in small cycles , easy to heat , while computers were affected Crankshaft Sensors temperature index , will be issued to increase fuel injection, increasing the idle valve opening instruction , increase the engine speed is conducive to allow the engine to heat up quickly ; temperature is normal , the fuel injection quantity and idle valve opening are restored to normal. When the temperature exceeds 80 to 90 degrees ( of the vehicle slightly different) , the thermostat valve is opened , the engine water jacket through which coolant flows through the radiator thermostat valves bigger radiator circulation of air generated by the vehicle flow , away a lot of heat , to maintain normal temperature of the coolant . Slow or even stop , but if the speed does not stall , no flow of air to help dissipate heat , the engine will quickly heat up, then issued a directive to the magnetic temperature sensor helps radiator cooling fan starts .

How to choose the correct humidity sensor

Human survival and social activities and humidity are closely related, it is important to measure the humidity , the humidity sensor and thus also the birth , it can feel the water vapor content of the gas , which can be converted to an output signal . Today , it is difficult to find an area on humidity , the following describes some of the problems the humidity sensor . A Select the humidity sensor measuring range selection Camshaft Sensors measuring range and measuring weight, temperature , the choice of the humidity sensor must first determine the range of measurement. In addition to weather , research departments, to engage in temperature and humidity monitoring in general do not need all wet process (0-100% RH) measurements. In today's information age , sensor technology and computer technology , automatic control closely with Zhu surgery . The purpose is to control measurement , measurement range and control of the use of collectively . Of course, do not need to engage in monitoring and control system applications are concerned, directly select universal moisture meter on it. Here are some of the application areas of the humidity sensor temperature and humidity of the different requirements for users' reference ( see Table 1 ) . Users need to raise production Crank Position Sensors measuring range , the manufacturer to ensure that users in the use of priority within the consistent performance of Engine Coolant Temperature Sensor , and seek a reasonable cost performance , in terms of both sides is a complementary thing. Second, select the humidity sensor measurement accuracy and measurement range , as the measurement accuracy of the sensor with the most important indicators. Each increase - percentage points. For sensors, is on a higher level , or even on the next level . To achieve different accuracy because its manufacturing costs vary widely , the price is also very different. For example imports an inexpensive humidity sensors only a few dollars, and one for the entire wet process of calibration and humidity sensors to a few hundred dollars , a difference of nearly a hundred times . Therefore, the user must be tailored , not the blind pursuit of "high, fine, sharp ." So first of all to control humidity temperature control is good , this is the large number of applications are often temperature and humidity - sensor integration and not simply because of the humidity sensor . In most cases, if there is no precise temperature control means , or a non- sealed space is measured , ± 5% RH of accuracy is sufficient . For applications requiring precise control of temperature and humidity of the local space , or need to keep track of changes in humidity recording of the occasion, and then use more than ± 3% RH humidity sensor accuracy . And this corresponds to the temperature sensor whose measurement accuracy ± 0.3 ℃ above shall be sufficient , at least ± 0.5 ℃ for . The accuracy better than ± 2% RH sensor calibration requirements but even the standard humidity generator is also difficult to do , not to mention Crankshaft Positioning Sensor itself . National Research Center humidity chamber article that : "Relative humidity measuring instruments , even at 20-25 ℃ under 2% RH to achieve the accuracy is still very difficult ." Third, consider the humidity sensor and temperature drift almost all sensors drift exists drift and drift . As the humidity sensor must be in contact with water vapor in the atmosphere , it is not sealed. This determines its stability and longevity is limited. Under normal circumstances , the manufacturer may indicate a second calibration of the effective use of time is 1 or 2 years , expires responsible for re-calibration. Please consider the user in selecting a good future sensor recalibration of channels , not freeloaders or superstitious foreign goods while ignoring the service asked genus.