Human survival and social activities are closely related to humidity. With the realization of modernization, it is difficult to find a field that has nothing to do with humidity. Due to different application fields, the technical requirements for humidity sensors are also different. So what should you pay attention to when choosing a humidity sensor?
1. Select the measurement range
As with measuring weight and temperature, the humidity sensor is selected first to determine the measurement range. In addition to meteorological and scientific research departments, temperature and humidity measurement and control generally do not require full wet range (0-100% RH) measurement.
2. Select measurement accuracy
Measurement accuracy is the most important indicator of the humidity sensor. For every percentage point increase, it is the last step for the humidity sensor, or even the previous level. Because of the different precisions, the manufacturing costs vary widely, and the selling price is far from the same. Therefore, the user must tailor the clothes, and should not blindly pursue "high, fine, sharp".
If the humidity sensor is used at different temperatures, the indication will also take into account the effects of temperature drift. It is well known that relative humidity is a function of temperature, which severely affects the relative humidity within a given space. The temperature changes by 0.1 °C. A humidity change (error) of 0.5% RH will be produced. In the case of use, if it is difficult to achieve constant temperature, it is not appropriate to propose excessive humidity measurement accuracy.
In most cases, the accuracy of ±5% RH is sufficient if there is no precise temperature control or if the space being tested is unsealed. For areas requiring precise control of constant temperature and constant humidity, or where it is necessary to track and record humidity changes at any time, select a humidity sensor with an accuracy of ±3% RH or higher.
The requirement that the accuracy is higher than ±2% RH may be difficult to achieve even the standard humidity generator of the calibration sensor, not to mention the sensor itself. Relative humidity measuring instruments, even at 20-25 ° C, to achieve 2% RH accuracy is still very difficult. The characteristics given in the general product data are measured at room temperature (20 ° C ± 10 ° C) and clean gas.
1. Select the measurement range
As with measuring weight and temperature, the humidity sensor is selected first to determine the measurement range. In addition to meteorological and scientific research departments, temperature and humidity measurement and control generally do not require full wet range (0-100% RH) measurement.
2. Select measurement accuracy
Measurement accuracy is the most important indicator of the humidity sensor. For every percentage point increase, it is the last step for the humidity sensor, or even the previous level. Because of the different precisions, the manufacturing costs vary widely, and the selling price is far from the same. Therefore, the user must tailor the clothes, and should not blindly pursue "high, fine, sharp".
If the humidity sensor is used at different temperatures, the indication will also take into account the effects of temperature drift. It is well known that relative humidity is a function of temperature, which severely affects the relative humidity within a given space. The temperature changes by 0.1 °C. A humidity change (error) of 0.5% RH will be produced. In the case of use, if it is difficult to achieve constant temperature, it is not appropriate to propose excessive humidity measurement accuracy.
In most cases, the accuracy of ±5% RH is sufficient if there is no precise temperature control or if the space being tested is unsealed. For areas requiring precise control of constant temperature and constant humidity, or where it is necessary to track and record humidity changes at any time, select a humidity sensor with an accuracy of ±3% RH or higher.
The requirement that the accuracy is higher than ±2% RH may be difficult to achieve even the standard humidity generator of the calibration sensor, not to mention the sensor itself. Relative humidity measuring instruments, even at 20-25 ° C, to achieve 2% RH accuracy is still very difficult. The characteristics given in the general product data are measured at room temperature (20 ° C ± 10 ° C) and clean gas.
Alumina Ceramic,Alumina Ceramic Ring,99 Alumina Ceramic Ring,Corrosion Resistance Of Alumina Ceramic Ring
Yixing Guanming Special Ceramic Technology Co., Ltd , https://www.guanmingceramic.com