The temperature range of domestic high and low temperature damp heat test chambers typically spans from -80°C to +150°C, with common options including -60°C to +150°C, -40°C to +150°C, and -20°C to +150°C. For special high-temperature applications, some models can reach up to 180°C. The refrigeration system in these chambers is generally divided into two types: single-stage refrigeration and cascade refrigeration. A single-stage refrigeration system allows the chamber to achieve a minimum temperature of -20°C, while a dual-stage or cascade system can go as low as -80°C. This system uses two separate single-stage refrigeration units, operating in an overlapping manner to ensure efficient cooling across a wide temperature range.
Heating in these test chambers is typically provided by nickel-chromium alloy heating elements, which are controlled using solid-state relays to regulate heat output accurately. Once the chamber reaches the desired temperature and stabilizes, the heater remains active to maintain the set point.
Regarding humidity control, most domestic and international high and low temperature damp heat test chambers offer a relative humidity range of 30% to 98% RH. However, if the chamber lacks a dehumidification system, the humidity range is usually limited to 85% to 98% RH, making it suitable only for high-humidity testing. These models tend to be more cost-effective. It's important to note that humidity specifications should always include the corresponding temperature range, as relative humidity is directly influenced by temperature. At higher temperatures, the same amount of moisture results in lower relative humidity.
The humidification system consists of a humidifier, water management components, and temperature sensors. The water used for humidification must be pure and soft, so filters and demineralizers are often installed in the water supply line. A common method for measuring humidity is the dry and wet bulb hygrometer, which provides accurate readings based on the difference in temperature between the two bulbs.
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