Important sensor system for constant temperature and humidity test chamber
The constant temperature and humidity test chamber is specially designed for temperature and humidity test. It has high technical requirements for temperature and humidity testing. The precise sensor system has become an indispensable part of the constant temperature and humidity test chamber to ensure temperature and humidity. The accuracy and timeliness of the information, the sensor test system of the test box mainly refers to the temperature and humidity sensor.
Temperature sensors are divided into resistors and thermocouples. The domestic constant temperature and humidity test chamber mostly uses platinum resistance. PT100, its temperature measurement accuracy is high, the performance is stable, and the range can reach -200 °C - +650 °C, but its cost is higher. Thermocouples use a method to measure the value of the thermoelectromotive force. The temperature range is wider up to +1800 °C, with high precision. It can be remote, multi-point, centralized monitoring and automatic control, but its free end requires temperature compensation. And the measurement accuracy in the low temperature and normal temperature range is relatively low.
The humidity measurement methods of the constant temperature and humidity test chamber are dry and wet ball test method and electronic sensor test method. The wet and dry ball moisture measurement method is relatively widely used, and the maintenance is relatively simple. During the use process, it is only necessary to regularly add water to the wet ball and periodically replace the wet ball gauze. There is no strict limit on humidity, and testing in high temperature environments will not cause damage to the sensor. Will be affected by external conditions, if not meet the requirements, will affect the measurement accuracy. The electronic sensor moisture measurement method has higher accuracy and faster response. It is susceptible to dust, oil, etc., and will easily cause aging and deterioration of accuracy. There is a requirement for the humidity of the use environment, which may cause damage if it exceeds the specified humidity.
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