What temperature control features does a thermostatic test chamber offer? A constant temperature and humidity test chamber is designed to expose products to specific environmental conditions, testing their resistance to high temperatures, low temperatures, and humidity. As such, these chambers are equipped with the ability to heat, cool, humidify, and dehumidify, ensuring accurate and reliable simulation of real-world environments.
Cooling is a critical function within a constant temperature test chamber and plays a key role in determining its overall performance. The cooling system typically includes four main components: a compressor, condenser, expansion valve, and evaporator. The compressor acts as the heart of the refrigeration system, drawing in low-temperature, low-pressure gas and compressing it into high-temperature, high-pressure gas. This gas then releases heat through the condenser, turning into a liquid. The cooled liquid passes through the expansion valve, reducing its pressure, and enters the evaporator where it absorbs heat from the surrounding air, turning back into a low-temperature, low-pressure gas. This cycle continues, allowing the chamber to maintain precise temperature control.
Heating is another essential component of temperature regulation in a thermostatic test chamber. When the controller receives a heating command, it sends a voltage signal (typically 2–13 VDC) to a solid-state relay. This activates the relay, which in turn powers the heater via a contactor. The heat generated by the heater is then distributed throughout the chamber by a circulating fan, quickly raising the internal temperature to the desired level. For temperatures above 89°C, the system uses on-off control via the solid-state relay. However, for more stable control below 89°C, the system balances heat output from the heater with cooling provided by the refrigeration cycle, maintaining a consistent temperature.
The dehumidification process is also managed through the refrigeration system. The evaporator, located inside the chamber, is kept at a lower temperature than the surrounding air. As a result, moisture from the air condenses on the evaporator's surface, effectively removing humidity from the chamber. This continuous process helps achieve and maintain the desired humidity levels.
HUMGINE offers a wide range of testing equipment, including high and low temperature damp heat test chambers, constant temperature and humidity chambers, nitrogen-filled vacuum ovens, high-temperature vacuum drying ovens, low-temperature test boxes, vacuum defoaming units, AB glue defoamers, and drying cabinets. These devices are ideal for various industries requiring rigorous environmental testing.
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