The constant temperature and humidity test chamber is a critical tool used to evaluate a product's ability to withstand extreme environmental conditions, such as high or low temperatures and varying levels of humidity. It combines heating, cooling, humidifying, and dehumidifying functions to simulate real-world environments. Understanding how the temperature is controlled within this device can help users better operate and maintain it.
Temperature control in the test chamber is primarily managed through a heating system. When a heating command is issued, the controller sends a voltage signal to a relay, which then activates a solid-state relay with approximately 3–12 volts of direct current. This allows the AC terminal to act like a closed circuit, engaging a contactor and supplying power to the heater. Once activated, the heater generates heat, which is distributed throughout the chamber by a circulating fan, gradually raising the internal temperature to the desired level.
Cooling is equally important in maintaining precise environmental conditions. The cooling system consists of four main components: a compressor, condenser, expansion valve, and evaporator. The compressor plays a central role by drawing in low-temperature, low-pressure refrigerant gas and compressing it into high-temperature, high-pressure gas. This gas then moves to the condenser, where it releases heat and turns into a liquid. The refrigerant then passes through the expansion valve, reducing its pressure and temperature, before entering the evaporator. Here, it absorbs heat from the surrounding air, turning back into a gas and completing the cooling cycle.
Although the mechanisms for heating and cooling differ, both processes are governed by the same control system, which ensures accurate and stable environmental conditions inside the chamber. A clear understanding of these principles not only enhances operational efficiency but also helps in troubleshooting and maintaining the equipment properly.
By mastering the science behind temperature and humidity control, users can make the most out of their constant temperature and humidity test chamber, ensuring reliable and repeatable testing results.
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