Similarities and differences between high and low temperature alternating damp heat test box and hig

High and low temperature alternating damp heat test chamber and high and low temperature test chamber, the performance of these two equipment is basically the same, but the control method is different. The purpose is to make the product through the repeated cycle process of temperature from normal temperature to low temperature to high temperature, pretreating the product and its contents, and then performing routine tests to assess the product passing through different circulation environments. Different changes in humidity, after simulating various climates or extreme climates, the product's ability to withstand various environments.　　

The difference between the high and low temperature alternating damp heat test box and the high and low temperature test box is mainly in the control part. The control part of the high and low temperature test box is mainly controlled by a digital display instrument, while the high and low temperature alternating damp heat test box is controlled by a programmable controller. Yes, digital display instruments are generally controlled manually, and the commands that can be executed are generally single, while the programmable controller is fully automatic. You can set the parameters to be set and the number of tests in advance, and then follow the settings The program works. Their cabinet structure is basically the same, and the technical parameters are also the same.

The principle of high and low temperature alternating damp heat test chamber:

The high and low temperature alternating damp heat test chamber is composed of a refrigeration system, a heating system, a control system, a temperature system, an air circulation system, and a sensor system. The above systems are divided into two aspects: electrical and mechanical refrigeration. The following is a preliminary description of the working principles and working processes of several major systems.

1. Humidity system: The humidity system is divided into two sub-systems: humidification and dehumidification.

2. Control system: The control system is the core of the comprehensive test box, which determines the temperature rise rate and accuracy of the test box and other important indicators.

3. Heating system: Compared with the refrigeration system, the heating system of the test chamber is relatively simple. It is mainly composed of high-power resistance wire. Due to the higher heating rate required by the test box, the heating system power of the test box is relatively large, and a heater is also provided on the bottom plate of the test box.

4. Refrigeration system: The refrigeration system is one of the key parts of the comprehensive high and low temperature alternating damp heat test chamber. Generally speaking, the refrigeration methods of high and low temperature alternating damp heat test chambers are mechanical refrigeration and auxiliary liquid nitrogen refrigeration. Mechanical refrigeration adopts vapor compression refrigeration, which are mainly composed of compressor, condenser, throttling mechanism and evaporator.

6. Air circulation system: The air circulation system generally consists of a centrifugal fan and a motor that drives its operation. It provides circulation of air in the test chamber.

7. Sensor system: The sensors of the test chamber are mainly temperature and humidity sensors.