Optional temperature and humidity sensors , note range, the measurement accuracy selection

Optional temperature and humidity sensors need to pay attention to measurement range , measurement accuracy of selection ; while also taking into account the time drift and drift and other key factors. Other, The humidity sensor non- sealing , to protect the measurement accuracy and stability , should be avoided in acidic, alkaline , and an atmosphere containing organic solventsBe used. How to buy See article detailed analysis.1 Select the measurement rangeAnd 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 controlThe generally do not need all wet process (0-100% RH) measurements.2 Select the measurement accuracyAccuracy is the most important indicator of the humidity sensor , each increase - percentage points , it is the humidity sensor to a higher level , or even onA grade. To achieve different accuracy because its manufacturing costs vary widely , the price is also very different. Therefore, the user must be tailored, notShould the blind pursuit of "high, fine, sharp ." As at different temperatures andhumidityCamshaftPositioning Sensor, which shows the value of the temperature drift effects should also be considered . As we all know ,Relative humidity is a function of temperature , temperature of seriously affecting the relative humidity within the specified space . Each change of temperature 0.1 ℃. Will generate 0.5% RH humidityChange ( error). If it is difficult to do using the occasion thermostat , theproposed high measuring precision is inappropriate.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 fineIndeed controlled constanttemperature 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. The accuracy better than ± 2% RH sensor calibration requirements but even the standard humidity generator is also difficult to do , not to mention Position Sensor itself . Relative humidityMeasuring instruments , even at 20-25 ℃ under 2% RH to achieve the accuracy is still very difficult. Product information is usually given characteristics at room temperature ( 20℃ ± 10 ℃) and the clean gas measurements .3 Consider when the drift and driftIn actual use, due to dust, oil and of harmful gases , use over time , produce electronic humidity sensor aging, precisionDecline in electronic humidity sensor drift is generally within ± 2% or even higher . Under normal circumstances , the manufacturer would have marked a second calibrationEffective use of time is 1 or 2 years , due for re-calibration.