The constant temperature and humidity weighing test chamber is a device used to simulate various environmental conditions and conduct weighing tests simultaneously. It combines the functions of a constant temperature and humidity test chamber and weighing equipment, mainly used for weighing and testing items under specific environmental conditions to ensure the accuracy and reliability of measurement results.
The working principle of the constant temperature and humidity weighing test chamber mainly includes temperature control, humidity control, and the synergistic effect of the weighing system.
Temperature control: The constant temperature and humidity weighing test chamber adjusts the temperature inside the chamber through a cooling and heating system. When the temperature inside the box is higher than the set temperature, the fully enclosed refrigeration compressor unit starts working to reduce the temperature; When the temperature is lower than the set temperature, the heating device works to increase the temperature. The temperature control system adopts PID control, which monitors temperature data in real time through sensors and dynamically adjusts the switch status of heating and cooling equipment to maintain temperature stability.
Humidity control: Humidity control includes two processes: humidification and dehumidification. When the humidity inside the box is lower than the set value, the temperature and humidity sensor will transmit a signal to the microcomputer automatic control screen, and start the ultrasonic humidifier and centrifugal fan for humidification; When the humidity is higher than the set value, start the refrigeration system for dehumidification. Humidification is achieved through ultrasonic humidifiers, while dehumidification is achieved through condensation of moisture on the evaporator surface of the refrigeration system or adsorption of desiccants.
Weighing system: The weighing system is independent of the temperature and humidity control system and is responsible for measuring and recording weight changes during the testing process. The weighing sensor converts the weight signal into an electrical signal and transmits it to the weighing display for display and control.
Precautions during the experimental process:
Avoid frequent opening of doors to avoid affecting the stability of temperature and humidity inside the box.
The samples should be evenly distributed to avoid obstructing air circulation.
The parameter settings should first adjust the low temperature, then increase it to the desired temperature, and set the constant temperature first before setting the humidity.