Lab Three-Combination Test Chamber Low Pressure Test Guide
Sep 13, 2025
The core system of the three-combination test chamber mainly consists of a pressure-bearing test chamber, a vacuum system, a special temperature and humidity control system, and a high-precision collaborative controller. Essentially, it is a complex set of equipment that highly integrates a temperature/humidity environment chamber, a vibration table, and a vacuum system (highly simulated). The process of conducting low-pressure tests is a precise collaborative control process. Taking the low-temperature - low-pressure test as an example, its test process is as follows:
1. Preparation stage: Firmly install the sample on the vibrating table surface inside the box (if vibration is not required, install it on the sample rack), close and lock the box door to ensure that the high-strength sealing strip is effective. Set the complete test program on the control interface, including:Pressure curve, temperature curve, humidity curve and vibration curve.
2. Vacuuming and cooling: The control system starts the vacuum pump set, and the vacuum valve opens to begin extracting the air inside the box. Meanwhile, the refrigeration system started to work, sending cold air into the box, and the temperature began to drop. The control system will dynamically coordinate the pumping speed of the vacuum pump and the power of the refrigeration system. Because when the air becomes thinner, the efficiency of heat conduction is greatly reduced, and the difficulty of cooling will increase. The system may not fully cool down until the air pressure drops to a certain level.
3. Low-pressure/low-temperature maintenance stage: Once both the pressure and temperature reach the set values, the system enters the maintenance state. As there is extremely tiny leakage in any box, the pressure sensor will monitor the air pressure in real time. When the air pressure exceeds the set value, the vacuum pump will automatically start to pump a little, maintaining the pressure within a very precise range.
4. Humidification is the most complex step. If it is necessary to simulate high humidity in a high-altitude and low-pressure environment, the control system will activate the external steam generator, and then slowly "inject" the generated steam into the low-pressure box through a special pressurization and metering valve, and the humidity sensor will provide feedback control.
5. After the test period ends, the system enters the recovery stage. The controller slowly opens the pressure relief valve or air injection valve to allow dry filtered air to slowly enter the box, enabling the air pressure to steadily return to normal pressure. When both the air pressure and temperature stabilize at room temperature and normal pressure, the controller will send a signal to indicate the end of the test. The operator can then open the box door and take out the sample for subsequent performance testing and evaluation.
The low-pressure test of the three-combination test chamber is a highly complex process, which relies on the precise coordination of its pressure-resistant chamber, powerful vacuum system and temperature and humidity control system specially designed for low-pressure environments. It can truly simulate the harsh tests that products simultaneously endure in high-altitude, high-altitude and other environments, including severe cold, low oxygen (low air pressure), and humidity. It is an indispensable key testing device in fields such as aerospace, military industry, and automotive electronics.
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