The constant temperature and humidity test chamber has been one of the more common technical conditions for the control of ambient temperature and humidity and the monitoring and analysis of the moisture value of industrial materials. However, among the conventional environmental parameters, humidity is the most difficult to accurately measure. parameter. This is because measuring humidity is much more complicated than measuring temperature, temperature is measured independently, and humidity is affected by other factors such as atmospheric pressure and temperature. In addition, the calibration of humidity is also a problem. The humidity calibration equipment produced abroad is very expensive.
The humidity measurement of the constant temperature and humidity test chamber is divided into two or thirty kinds in principle. But humidity measurement has always been one of the famous problems in the world of metrology. A seemingly simple measure of value, involving quite complex physical-chemical theoretical analysis and calculations, may involve many factors that must be noted in humidity measurement, thus affecting the rational use of the sensor.
There are two main types of humidity measurement schemes for modern constant temperature and humidity test chambers: dry and wet bulb moisture measurement, and electronic humidity sensor moisture measurement. The maintenance of the wet and dry ball moisture measurement method is quite simple. In actual use, it is only necessary to periodically add water to the wet ball and replace the wet ball gauze. Compared with the electronic humidity sensor, the wet and dry ball moisture measurement method does not cause aging, and the accuracy is lowered. The accuracy level of the electronic humidity sensor should be judged in combination with its long-term stability. In general, the long-term stability and service life of the electronic humidity sensor are not as good as the dry-wet ball humidity sensor.
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