In the course of the humidity sensor has several issues deserve attention

In the course of the humidity sensor has the :Select the measurement range and 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 , Shaft Position Sensor technology and computer technology , automatic control technology closely integrated with . 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. Select the same measurement accuracy and measurement range , measurement accuracy of the sensor with the most important indicators. Each increase - percentage points. It is for the sensor to 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 Engine Coolant Temperature Sensor 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 ." Manufacturers often give its humidity sensor segmentation accuracy . In case of low humidity segment ( 0 a 80% RH) was ± 2% RH, and the humidity segment (80-100% RH) was ± 4% RH. And this accuracy is at a specified temperature (such as 25 ℃) value. If used at different temperatures andCar Temperature Sensor. Its indication should also consider the impact of temperature drift . Is known , the relative humidity is a function of temperature , temperature seriously affecting the relative humidity within the specified space . Each change of temperature 0.1 ℃. Will generate 0.5% RH humidity change (error ) . If it is difficult to do using the occasion thermostat , the proposed high measuring precision is inappropriate. Because humidity variations with temperature drift suddenly uncertain , then talk about measuring precision will be moot . 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 ± 3% RH. Above precision humidity sensor . And this corresponds to the temperature sensor. Its 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 the sensor itself .