Select the humidity sensor measurement accuracy

And the same 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 humidity sensors only a few dollars, and one for the entire wet process of calibration and Camshaft Positioning Sensor 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 . Such as the low temperature section ( 0 a 80% RH) was ± 2% RH, and the humidity sections (80-100% RH) was ± 4% RH. And this accuracy is at a specified temperature (such as 25 ℃) value. If used at different temperatures and humidity sensors. 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 Car Temperature 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. 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 . 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, when considering the Crank Shaft Position Sensor drift and drift
Almost all of the sensors are present when the 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.