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. Special requirements may allow for temperatures up to 180°C. The refrigeration system in these chambers can be either a single-stage or cascade system. A single-stage refrigeration system is capable of reaching as low as -20°C, while a dual-stage (or cascade) system can achieve temperatures as low as -80°C. This system works by combining two separate refrigeration units, effectively overlapping their cooling ranges to provide more extreme low-temperature performance.
Heating elements in these test chambers are usually made of nichrome alloy resistance wires, which generate heat efficiently. Solid-state relays are used to control the power output of the heaters, ensuring precise temperature regulation. When the chamber reaches the desired temperature, the heater remains active to maintain stability.
Regarding humidity, most high and low temperature damp heat test chambers, both domestically and internationally, offer a humidity range of 30% to 98% RH. However, if the chamber lacks a dehumidification system, the humidity range is typically limited to 85% to 98% RH, making it suitable only for high-humidity testing. These models are generally more affordable. It's important to note that the humidity specification should always be accompanied by the corresponding temperature range, as relative humidity is directly affected by temperature. At higher temperatures, the same amount of moisture results in lower relative humidity.
The humidification system includes a humidifier, water management components, and a temperature sensor. The water used for humidification must be pure and softened, so filters and demineralizers are often installed in the water line. A common method for measuring humidity is using a dry and wet bulb hygrometer, which provides an accurate reading based on the difference in temperature between the two bulbs.
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