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.