One of the hottest questions at the moment is why the temperature and humidity Test Chamber will not be cooled, which has troubled many users. The Test Chamber at constant temperature and humidity is to simulate the adaptability of the product in an alternating thermal environment of high temperature, low temperature and humidity. The temperature and humidity required by the customer need to be provided in the test room with constant temperature and humidity. If the temperature is too high or too low, it will affect the product test. A constant temperature and humidity test will be carried out. The box has automatic heating, cooling, humidifying and dehumidifying functions. Constant temperature and humidity Test Chamber
The heating device is the main equipment to control the temperature. When the control system receives the heating command, the heating device will output DC voltage to the relay and solid state relay. The AC terminals are equivalent to wire connections, and the controller is qualified. Plus switch control with solid state relays.
The cooling rate is an important parameter to judge the performance of the constant temperature and humidity Test Chamber. The cooling temperature is composed of four main parts: compressor, condenser, throttling device and evaporator. In order to solve everyone's troubles as soon as possible, the following small series will discuss this issue with you.
Factor one:
1. Whether the temperature of the equipment is constant. If it is not maintained for a long time, it is necessary to first check whether the refrigeration compressor can be started normally during the operation of the test equipment, and whether the compressor can be started during the operation of the test equipment. each compressor. The wiring is normal and there is no problem with the electrical appliances.
2. If there is no problem with the electrical system, please check the refrigeration system of the equipment. First of all, the low-temperature compressors of the two groups of refrigeration units, the discharge pressure and the suction pressure are all lower than normal pressure, and the suction pressure is in a vacuum state, which indicates that the refrigerant in the compressor is insufficient.
Factor two:
1. The cause of the failure has not been determined. The cause of the failure is further determined in combination with the control process of the constant temperature and humidity equipment. The equipment has two sets of refrigeration units.
2. One is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two sets of units will work simultaneously. If there is no temperature instability, the cooling rate will slowly decrease. In the temperature maintenance stage, once the auxiliary unit stops working and the main unit has no cooling effect, the air in the working room will rise slowly. When the temperature reaches a certain level, the control system will start the cooling of the auxiliary unit and then stop the auxiliary unit. run so that the operation will fail.
