The constant temperature and humidity test box is placed in the specified temperature and humidity, to see the product's high temperature resistance, low temperature resistance, and humidity resistance. Then the constant temperature and humidity machine has the functions of heating, cooling, humidifying and dehumidifying.
The constant temperature and humidity test box heating device is the key link for controlling the constant temperature and humidity machine; it is the output voltage to the relay when the controller receives the heating command, about 3-12 volts DC is added to the solid state relay; its AC terminal It is equivalent to the wire being connected; the contactor is also sucked at the same time, the voltage is heated at both ends of the heater, and the heat is brought to the box by the circulating fan to warm the constant temperature and humidity machine, and the temperature reaches your set value quickly. The controller is adjusted by turning on and off the solid state relay; we adjust the heat output by watching the heating output on the screen of the constant temperature and humidity machine; this is the temperature control above 89 degrees, how to control the temperature stability below 89 degrees? The wet machine is on one side through the solid state relay to generate heat; the other is through the compressor refrigeration cycle to achieve dynamic balance; the temperature is constant. The constant temperature and humidity test box cooling is an important part of the constant temperature and humidity machine. It is an important parameter for determining the performance of a constant temperature and humidity machine. It consists of four components: compressor, condenser, throttling device and evaporator. The compressor is the heart of the refrigeration system. It inhales low-temperature and low-pressure gas, turns into high-temperature and high-pressure gas, releases heat by condensing into liquid, and removes heat through the fan. Therefore, the temperature of the constant temperature and humidity machine is caused by hot air, and then throttling to low-pressure liquid. Secondly, it 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 constant temperature and humidity test chamber humidification system 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. The constant temperature and humidity test box dehumidification system is also completed by the refrigeration system, and the evaporator is placed inside the constant temperature and humidity machine; relatively cold, the high humidity gas inside the constant temperature and humidity machine will see the cold object condense into liquid; thus repeating the high humidity of the box There will be very little gas to achieve the purpose of dehumidification.
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