The constant temperature and humidity test box is used to test and determine the parameters and performance of electrical, electronic and other products and data after the temperature environment changes. It can be mainly used in all walks of life, mainly in these areas: aerospace military, automobile spare parts, household appliances, scientific research institutes, inspection and Quarantine Bureau and so on. How to control the temperature and humidity inside the constant temperature and humidity test box? According to the response of technical departments, there are the following functions and methods.

First, the warming ability of the box itself

1: The heating equipment is the key link for the box itself to control the constant temperature and humidity test box.

2: In addition, when the controller receives the warming instructions, it will output voltage to the relay, about 3-12 volts of direct current is added to the solid state relay; its communication terminal is equivalent to wire connection; the contactor also sucks together, the two ends of the heater have voltage to make it heat, through the circulating fan to drive the heat to the box, so that the constant temperature and humidity test machine can be warmed up at the same speed.

3: When the temperature of the machine reaches your set value, its controller is adjusted by switching on and off the solid state relay.

4: When we are making a test stand in the constant temperature and humidity test box, we can see how much energy we need to exert to adjust the calorific value on the screen; this is the temperature control above 89 degrees, and how to control the temperature stability below 89 degrees? The constant temperature and humidity test box is the output of heat generated by solid state relay on one side; the other can be cooled by compressor refrigeration cycle to reach dynamic equilibrium; the temperature is stable.

2. Cooling Ability of Box

1. Cooling ability is an important link in the temperature adjustment of the inner box of constant temperature and humidity test box. It is an important parameter to judge the performance of a constant temperature and humidity machine. It consists of compressor, condenser, saving equipment and evaporator.

2: The compressor of the box machine is the heart of the constant temperature and humidity refrigeration system. It can inhale low temperature and low pressure gas, then turn into high temperature and high pressure gas, then condense into liquid to release heat, and eventually take away heat through the fan. This is why the hot air is under the constant temperature and humidity machine, and then save to low pressure liquid, and secondly. After the evaporator makes him a low temperature and low pressure gas, he can eventually return to the compressor; after the refrigerant absorbs a lot of heat in the evaporator, it can finish the process of gasification and absorb heat, then reach its refrigeration intention, and then it can finish the process of cooling the constant temperature and humidity machine.

Three: Humidifying Ability

The constant temperature and humidity test box is made of high humidity and low humidity through humidification system.

Fourth: Humidity Reduction Ability

The dehumidification system is also completed by the refrigeration system, the first thing is to put the evaporator in the small constant temperature and humidity test box; because it is relatively cold here, the high humidity gas in the constant temperature and humidity test box can understand that the cold object condenses into liquid; after such repetition, the high humidity gas of the box body can understand very little and eventually reach the purpose of dehumidification.