How to control the internal temperature and humidity of the constant temperature and humidity test chamber

The constant temperature and humidity test chamber refers to the product placed at the specified temperature and humidity to see the product's high temperature resistance, low temperature resistance, and humidity resistance.

The constant temperature and humidity test chamber has four capabilities:

First, heating capacity

1. The heating device is the key link for controlling the 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. The voltage causes it to heat up, and the heat is brought to the tank by the circulating fan to warm the constant temperature and humidity tester.

3, that temperature reaches your set value quickly; the controller is adjusted by switching on the solid state relay

4, we in the constant temperature and humidity test box to see how much heating output on the screen to adjust the heat; 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 based on the heat output of the solid state relay on one side; the other is cooled by the compressor refrigeration cycle to achieve dynamic balance; the temperature is constant.

Second, cooling capacity

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, emits 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.

Third, the humidification capacity

The humidification system of the constant temperature and humidity test chamber is substantially the same as the heating system; it is a process in which the heater heats the water into a steam; the purpose of humidifying the constant temperature and humidity machine is completed.

Fourth, the ability to reduce humidity

The dehumidification system is also completed by the refrigeration system, and the evaporator is placed in the 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 a liquid; thus the high humidity gas of the repeated box will be very Less, achieve the purpose of reducing humidity.