The constant temperature and humidity test chamber is used to test and determine the parameters and performance of electronic components such as electrical, electronic and other products and materials after high temperature, low temperature, damp heat or constant temperature environment changes.
It can be mainly used in various industries, here mainly talk about these aspects: aerospace military, auto parts, household appliances, scientific research institute, inspection and quarantine bureau and other necessary testing equipment. How is the temperature and humidity inside the constant temperature and humidity test chamber controlled? According to the response of the technical department, there are the following major functions and methods.
One: the heating capacity of the cabinet itself
1: The heating device is the key link that the box itself can control whether the constant temperature and humidity test box has the function of heating up
2: In addition, it is mainly that the controller will output a voltage to the relay when it gets the temperature increase command, about 3-12 volts DC is added to the solid state relay; its AC terminal is equivalent to the wire connection; the contactor also pulls in at the same time There is voltage at both ends of the heater to make it heat, and the heat is brought into the box by the circulation fan, so that the constant temperature and humidity testing machine can heat up at a speed
3: Wait for the temperature of the machine to reach your set value; then his controller is adjusted by adding on and off the solid state relay.
4: When we are doing the test machine in the constant temperature and humidity test chamber, see how much heating is required on the screen to adjust his calorific value; this is temperature control above 89 degrees, how to control the temperature stability below 89 degrees?
The constant-temperature and constant-humidity test chamber is used to generate heat through the solid state relay on one side; in addition, it can also be cooled by the compressor refrigeration cycle to achieve dynamic balance; the temperature is constant.
Two: the cooling capacity of the cabinet
1. The cooling capacity is an important part of the temperature regulation in the constant temperature and humidity test chamber. This is an important parameter to determine the performance of a constant temperature and humidity machine. It includes a compressor, a condenser, a throttle device, The evaporator is composed of four important parts.
2: The compressor of the box machine is the heart of the constant temperature and humidity refrigeration system. It can suck low-temperature and low-pressure gas, which can become high-temperature and high-pressure gas, and then release heat by condensing into liquid, and finally take away the heat through the fan. Such a process, which is why the constant temperature and humidity machine is under the hot air, and then throttled to a low pressure liquid, followed by an evaporator to make him a low temperature and low pressure gas, and finally can return to the compressor; refrigerant in the evaporator After absorbing a large amount of heat, wait for the completion of the gasification process to absorb heat again, and then achieve its cooling purpose, so that the cooling process of the constant temperature and humidity machine can be completed.
Three: humidification capacity
The constant temperature and humidity test chamber uses a humidification system to carry out high humidity and low humidity in the chamber.
Four: dehumidification capacity
The dehumidification system is also completed by the refrigeration system. First of all, the evaporator must be placed in a small constant temperature and humidity test chamber; because it is relatively cold, the high humidity gas in the constant temperature and humidity test chamber will meet the condensation of cold objects into liquid; Such repeated high humidity gas in the cabinet will be very little, and eventually the purpose of dehumidification can be achieved.
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