Analysis of Control Factors for Temperature of Constant Temperature and Humidity Chamber

Constant temperature and humidity test chamber , as its name suggests, as its name: test chamber that can adjust the temperature and humidity to achieve the test effect. Simple high temperature, low temperature, and wet tests can be selected from constant temperature and humidity chambers; if multiple cycles of tests are required, it is convenient for testing, and a programmable constant temperature and humidity test chamber can be selected. The high temperature and low temperature of the constant temperature and humidity chamber are controlled by heating pipes and refrigeration equipment, respectively.

The temperature of the constant temperature and humidity test chamber is controlled mainly by the heating pipe. It is the output voltage to the relay when the controller receives the temperature increase command, about 3-32V DC is added to the solid state relay; its AC terminal is opposite to the wire. The contactor is also sucked together, and there is voltage at both ends to make it heat. The heat is brought to the box by the circulating fan, so that the constant temperature and humidity test chamber is heated up, when the temperature is about to reach the set value; the PID is adjusted by the solid state relay. Controller; we can visually see the heater output rate on the control panel of the test chamber.

The heating pipe in the heating zone of the constant temperature and humidity test chamber is also prone to failure, and the heating wire is prone to blown, and the heating part SSR may be damaged. The processing method is also very simple. Replace the heating wire and the terminal block and replace the SSR .

Refrigeration is an important reference indicator for determining the performance and configuration of a constant temperature and humidity chamber. It consists of a compressor, a spiral high-efficiency refrigerant copper tube, a corrugated fin evaporator, a drying filter, an oil separator, a solenoid valve, etc. The humidification system uses an external boiler steam humidifier to save energy and reduce consumption. It can save 70% energy consumption; it is the process of heating the water into steam by the humidifier to achieve the purpose of humidifying the constant temperature and humidity chamber. In addition to refrigeration, the compressor also has a dehumidification function, which achieves the purpose of reducing humidity by controlling the refrigeration system.

The R404A compressor occasionally has a gas stagnation phenomenon . The reason for the gas stringage may be that the expansion valve of the first stage refrigeration system is too large, and the installation direction of the plate heat exchanger is problematic . This requires the engineer to confirm the repair.

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