1. The heating device is the key link for controlling the small constant temperature and humidity test chamber.

2. It is the controller that outputs the voltage to the relay when it receives the temperature rise command. About 3-12 VDC is added to the solid state relay; its AC terminal is equivalent to the wire connection; the contactor is also attracted at the same time, and the heater has both ends. The voltage causes it to heat up, and the heat is brought to the tank by the circulating fan to heat the constant temperature and humidity tester.

3. When the temperature reaches your set value quickly; the controller is adjusted by turning on and off the solid state relay.

4. We adjust the heat output by watching the heating output on the screen in the constant temperature and humidity test chamber; this is the temperature control above 89 degrees, how to control the temperature stability below 89 degrees? The constant temperature and humidity test chamber is on one side through the solid state relay How much heat is generated; the temperature is reached by the compressor refrigeration cycle to achieve dynamic equilibrium; the temperature is constant.

1. The important part of the constant temperature and humidity test chamber is an important parameter for judging the performance of a constant temperature and humidity machine. It consists of four major components: compressor, condenser, throttling device and evaporator.

2, the compressor is the heart of the refrigeration system, it inhales low-temperature and low-pressure gas, becomes high-temperature and high-pressure gas, releases heat by condensing into liquid, and removes heat through the fan, so the temperature of the constant temperature and humidity machine is caused by hot air, and then by throttling The low-pressure liquid passes through the evaporator to become a low-temperature low-pressure gas and finally returns to the compressor; the refrigerant absorbs heat in the evaporator to complete the gasification process and absorbs heat, thereby achieving the purpose of cooling, and completing the cooling process of the constant temperature and humidity machine.

The process of humidification is to increase the partial pressure of water vapor. The initial humidification method is to spray water to the test chamber wall, and the water surface saturation pressure is controlled by controlling the water temperature. The water on the surface of the tank wall forms a large surface on which the water vapor pressure is added to the tank by means of diffusion to increase the relative humidity in the test chamber. This method appeared in the 1950s.

The dehumidification system is also completed by the refrigeration system, and the evaporator is placed in the small constant temperature and humidity test chamber; relatively cold, the high humidity gas in the constant temperature and humidity test chamber will see the cold object condense into liquid; thus repeating the high humidity gas of the tank Rarely, to achieve the purpose of dehumidification.