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.