How the high and low temperature test chamber operates

2024-01-05

A high and low temperature test chamber is a testing equipment used to simulate various environmental conditions, including temperature, humidity, pressure, etc. The operating principle is mainly to adjust the temperature and humidity inside the test box through the control system and refrigeration system to achieve the required testing conditions.

1、 Control system

The control system of the high and low temperature test chamber is the core part of the entire equipment, which is responsible for controlling and adjusting the temperature and humidity inside the test chamber. Control systems typically consist of microprocessors, sensors, actuators, etc.

The microprocessor is the core of the control system, which controls the action of the actuator through a program based on the temperature and humidity signals detected by sensors, and adjusts the environmental conditions inside the test box. Microprocessors generally use microcontrollers or PLC controllers, which have powerful data processing and logic control capabilities. They can automatically adjust the operating status of equipment based on user set temperature and humidity values.

Sensors are devices used to detect the temperature and humidity inside the test chamber. They can convert temperature and humidity signals into electrical signals and transmit them to the microprocessor. Sensors generally use sensitive components such as thermistors and humidity sensors, which have the characteristics of high accuracy and good stability.

The actuator is a device used to adjust the environmental conditions inside the test chamber, and it can adjust the operating status of the device according to the instructions of the microprocessor. The actuator generally uses equipment such as heaters, humidifiers, and refrigeration systems, which can automatically adjust the operating status of the equipment based on the temperature and humidity values inside the test box.

2、 Refrigeration system

The refrigeration system is an important component of the high and low temperature test chamber, which can provide a low-temperature environment and lower the temperature inside the test chamber to the required testing conditions. Refrigeration systems generally use compressor refrigeration technology, which produces low temperatures through equipment such as compressors, condensers, and evaporators.

The compressor is the core equipment of the refrigeration system, which can compress the refrigerant into high-pressure gas and deliver it to the condenser. A condenser is a device used to cool high-pressure gas into liquid, which can transfer heat from the gas to cooling water or air. An evaporator is a device used to evaporate liquids into gases, which can absorb the heat inside the test chamber, thereby reducing the temperature inside the test chamber.

The operating principle of the refrigeration system is to adjust the start stop, running time, and operating frequency of the compressor through the control system to achieve the required temperature and humidity values. During the refrigeration process, the refrigerant absorbs heat in the evaporator and turns into gas, which is then transported by the compressor to the condenser. The heat is released to cooling water or air and then turns into a liquid. Finally, the refrigerant absorbs heat again through the evaporator, forming a cyclic process.

3、 Running process

The operation process of a high and low temperature test chamber generally includes the following steps:

1. Connect the power and start the device;

2. The control system automatically adjusts the operating status of the equipment based on the temperature and humidity values set by the user;

3. The refrigeration system automatically adjusts the start stop, running time, and operating frequency of the compressor based on the temperature and humidity values inside the test box;

After the environmental conditions inside the test box reach the required testing conditions, the equipment will automatically stop running;

5. After the experiment is completed, turn off the power, wait for a period of time, then open the door of the test box and take out the sample;

6. Multiple tests can be conducted as needed, and each test requires resetting the temperature and humidity values.

The operation process of the high and low temperature test chamber needs to strictly follow the operating procedures, and regular maintenance and upkeep are required to ensure the normal operation and service life of the equipment.

Pay attention to these points when selecting a cold and hot shock test box