The three major systems and cleaning and maintenance of the constant temperature and humidity test chamber

 When buying a product, we must understand its composition clearly; and after the purchase, if we need to make it serve us better, then we must do a good job of cleaning and maintenance, so today we will take a look at constant temperature and humidity The three major systems and cleaning and maintenance of the test chamber.

1. Cleaning and maintenance of constant temperature and humidity test chamber

1. Cleaning and maintenance inside and outside the cabinet: In order to ensure the accuracy of the test results, the internal impurities should be removed before the constant temperature and humidity test cabinet is operated. At the same time, it should be cleaned at least once a year in the power distribution room. A vacuum cleaner can be used for cleaning. Just suck up the dust in the room!

2. Humidifier inspection and maintenance: The water in the humidifier should be replaced monthly to ensure clean water quality. At the same time, the humidification water tray should be cleaned monthly to ensure smooth water flow!

3. Condenser dust removal: The condenser in the constant temperature and humidity test chamber should be cleaned and maintained monthly, and the condenser radiating mesh should be vacuumed or sprayed with high-pressure air!

4. Inspection of overheating protection device: The overheating protection device should work at a high temperature of 20℃~30℃. When the test room temperature rises to the over-temperature protection setting value, the heater will immediately stop working, but the over-temperature warning light is always on, the fan is still running, and it works for a long time unattended, and the over-temperature protection should be checked before operation Device!

2. System composition of constant temperature and humidity test chamber

1. The air circulation system of the constant temperature and humidity test chamber: the centrifugal fan is responsible for sucking in the air from the return air outlet, and the air passes through the evaporator, humidifier, and electric heater. The sent air is mixed with the air in the space and returned to the return air vent, and then circulates until the test temperature is stable.

 2. Constant temperature and humidity test chamber electrical automatic control system: This part includes the power supply part and the automatic control part.

The power supply part automatically controls the compressor, fan, electric heater, humidifier and other power supply systems through the contactor, and the temperature and humidity control part and fault protection part of the power supply system also pass. Temperature and humidity control, through the temperature and humidity controller, the temperature and humidity of the return air are compared with the temperature and humidity set by the test, so that the compressor, humidifier, electric heating and other components can automatically cool down, heat up, and dehumidify to achieve a constant temperature. wet.

3. Compressor refrigeration cycle in the constant temperature and humidity test chamber: the liquid refrigerant in the evaporator absorbs the heat of the air (the air is cooled and dehumidified) and starts to evaporate, causing the refrigerant to form a certain temperature difference with the air, and the liquid refrigerant completely evaporates Become a gas, and then sucked and compressed by the compressor (increase pressure and temperature), the gas refrigerant absorbs heat through a condenser (air-cooled/water-cooled) and condenses into a liquid. The refrigerant cycle process is completed by the throttling of the expansion valve (or capillary tube) into the low-temperature and low-pressure refrigerant entering the evaporator.