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Core characteristics and working principle of double-layer constant temperature and humidity test chamber

View detailed information from:Internet Published on:2025-11-21

The double-layer constant temperature and humidity test chamber is an efficient environmental simulation testing equipment, featuring an independent dual-chamber structure, high-precision control, large capacity, rapid temperature change rate, programmable control, and safety protection. It is widely used in various industries such as electronics and automotive, and can meet the product testing needs in complex environments. The following is a detailed introduction to the double-layer constant temperature and humidity test chamber:
1. Core Features
Independent dual-cabin structure
A double-layer constant temperature and humidity test chamber typically consists of two independent test chambers, one above the other, each equipped with its own temperature and humidity control system. This design allows users to conduct tests under two different environmental conditions simultaneously (such as one chamber simulating high temperature and high humidity, while the other simulating low temperature and low humidity), or to perform comparative tests on samples from the same batch, significantly enhancing testing efficiency.
high-precision control
Utilizing advanced control systems and sensor technology, precise control over temperature and humidity is achieved. The temperature control accuracy can reach ±0.5℃, while the humidity control accuracy is ±2%RH, ensuring the accuracy and reliability of test results.
Large capacity and flexibility
The dual-chamber design not only expands the testing capacity but also allows for flexible adjustment of the chamber space according to sample size. For instance, the upper chamber can be designed with a larger space to accommodate large samples, while the lower chamber is used for testing small samples, achieving efficient space utilization.
Rapid temperature change rate
Equipped with advanced heating and cooling systems, it can achieve rapid temperature change rates, shorten testing cycles, and improve overall efficiency.
Programmable control
Supports multi-segment temperature and humidity curve programming, allowing users to customize test programs according to actual needs, enabling automated testing and management.
safety protection
Equipped with comprehensive safety features such as overheat protection, overload protection, and short circuit protection, ensuring the safety and stability of the testing process.
II. Working Principle
temperature control
Temperature rise process: The control system activates the heating element and simultaneously monitors the temperature in real-time using a Pt100 platinum resistance sensor. When the temperature approaches the set value, the heating power is reduced to avoid overshoot.
Cooling process: The compressor starts, and the refrigerant absorbs heat and vaporizes in the evaporator, reducing the air temperature; the condenser dissipates the heat outside the box. The PID control algorithm dynamically adjusts the heating/cooling power according to the temperature deviation to achieve stable temperature control.
humidity control
Humidification process: The humidity inside the box is directly increased by generating steam through heating water with electrodes (steam humidification), or by adjusting the evaporation rate through the temperature of the heating plate and the fan speed (shallow water plate humidification).
Dehumidification process: The water vapor in the air is condensed into water by the low temperature of the evaporator (refrigeration dehumidification), or the dehumidification efficiency is improved under low humidity requirements through the physical adsorption principle (molecular sieve dehumidification). The humidity sensor monitors the humidity in real time, and combines the temperature compensation algorithm to ensure control accuracy.

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