High and low temperature alternating heat and humidity test chambers and high and low temperature test chambers, the performance of these two devices is basically the same, but the control methods are different, users can purchase separately according to different requirements.
The difference between the high and low temperature alternating heat and humidity test chamber and the high and low temperature test chamber is mainly in the control part. The control part of the high and low temperature test chamber is mainly controlled by the digital display instrument, and the high and low temperature alternating heat and humidity test chamber is controlled by the programmable controller. The digital display instruments are generally controlled manually. The commands that can be executed are generally single, and the programmable controller is fully automatic. You can set the parameters to be set and the number of tests in advance, and then set them according to the settings. The program works. Their cabinet structure is basically the same, and the technical parameters are the same.
The principle of high and low temperature alternating heat and humidity test chamber:
The high and low temperature alternating heat and humidity test chamber is composed of a refrigeration system, a heating system, a control system, a temperature system air circulation system, and a sensor system, and the above systems belong to two major aspects of electrical and mechanical refrigeration. The following describes the working principle and working process of several major systems.
1. Humidity system: The humidity system is divided into two subsystems: humidification and dehumidification.
2. Control system: The control system is the core of the comprehensive test chamber, which determines the important parameters such as the heating rate and accuracy of the test chamber.
3. Heating system: The heating system of the test box is relatively simple compared to the refrigeration system. It mainly consists of high-power electric resistance wire. Because the heating rate required by the test box is large, the heating system of the test box has relatively large power, and the bottom plate of the test box is also provided with a heater.
4. Refrigeration system: The refrigeration system is one of the key parts of the integrated high and low temperature alternating heat and humidity test chamber. Generally speaking, the refrigeration modes of the high and low temperature alternating heat and humidity test chambers are mechanical refrigeration and auxiliary liquid nitrogen refrigeration, and mechanical refrigeration uses vapor compression refrigeration, which mainly consists of a compressor, a condenser, a throttle mechanism and an evaporator.
5, air circulation system: air circulation system generally has a centrifugal fan and a motor that drives its operation. It provides a circulation of air inside the test chamber.
6. Sensor system: The sensors in the test chamber are mainly temperature and humidity sensors.
High-low temperature alternating heat and humidity test chamber The purpose of the experiment is to pre-process the product and the contents through repeated cycles of temperature from normal temperature to low temperature to high temperature, and then carry out routine tests to check that the products are in different circulation. surroundings. Different changes in humidity, after simulating various climates or extreme climates, the ability of the product to withstand various environments.
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