China Test Machine, usually simply referred to as constant temperature and humidity machine, is a kind of equipment that can provide a controllable temperature and humidity environment. It is applicable to conducting various physical and chemical performance tests on materials, electronic components, finished products, etc. in a simulated environment, especially tests for high temperature resistance, low temperature resistance, and damp heat. Due to its wide application, the constant temperature and humidity testing machine has become the standard equipment on many laboratories and production lines.

The core of the China Test Machine lies in its complex control system and sensors. Its working principle mainly includes the following aspects:

Temperature control is one of the core functions of the China Test Machine. The equipment is equipped with a high-performance heating system and a cooling system inside. The heating system usually relies on electric heaters to heat the air or samples, while the refrigeration system uses compressors to cool, removing the heat from the air. Through high-precision temperature sensors, the real-time temperature is compared with the set temperature. The control system adjusts the heating or cooling intensity based on the difference to achieve and maintain the set temperature.

Humidity control is also an indispensable part. The humidity level inside the equipment is regulated by humidifiers and dehumidifiers. Humidifiers usually increase the moisture content in the air through steam or ultrasonic humidification, while dehumidifiers reduce the environmental humidity by means of condensation and adsorption. The humidity sensor monitors the relative humidity in the air in real time, and the control system achieves precise humidity control by adjusting the working states of the humidifier and dehumidifier.

Modern China Test machines are equipped with automatic control systems, which are usually precisely controlled through microcomputers or PLCS. Users can freely set the required temperature and humidity curves through the display screen, and the equipment will automatically operate according to the set program. This intelligent control not only enhances the efficiency of the equipment but also significantly reduces the errors caused by human operation.