Constant temperature and humidity machine (constant temperature and humidity test box | programmable constant temperature and humidity test machine | high and low temperature alternating humidity and heat test box) mainly provides constant humidity and heat, complex high and low temperature alternating test environment and test conditions for electronic parts, industrial materials, finished products in the research and development, production and inspection of each link of the test, suitable for electronic and electrical appliances, communications, chemical, hardware, rubber, toys and other industries. The operation of the constant temperature and humidity machine system is through three interconnected systems: refrigerant circulation system, air circulation system, electrical automatic control system; Refrigerant circulation system, the liquid refrigerant in the evaporator absorbs the heat of the air (the air is cooled and dehumidified) and begins to evaporate, and finally a certain temperature difference is formed between the refrigerant and the air, and the liquid refrigerant is also completely evaporated into low-temperature and low-pressure gas. After being inhaled and compressed by the compressor (pressure and temperature increase), the gaseous refrigerant absorbs heat through the condenser (air cooled/water cooled) and condenses into a liquid. After being throttled through the expansion valve (or capillary), low temperature and low pressure refrigerant enters the evaporator to complete the refrigerant circulation process. Constant humidity Constant humidity machine temperature range :0ºC~150ºC, humidity range :30%~98% RH, according to the test needs can be divided into vertical and desktop two.
Equipment characteristics
★ Perfect modeling design: arc modeling and surface spraying treatment, high texture appearance, and the use of flat no reaction handle, easy to operate, safe and reliable.
★ Large observation window wide and bright vision: using three layers of vacuum coated window and Philips energy-saving fluorescent lamp, no wiper to remove fog, maintain a clear observation effect, you can observe the condition of the test at any time.
★ Water and electricity separation to ensure safety: the humidification system pipeline and power supply, controller, circuit board separation, can avoid due to pipeline leakage and affect the circuit, improve safety.
★ Advanced and reliable refrigeration and control system: the original imported Europe and the United States fully closed compressor, imported environmental refrigerant, the world famous brand of refrigeration devices, the original imported LCD touch screen controller, friendly interface, easy to operate and learn
Technical term
Constant temperature and humidity test chamber (test chamber) closed and box or space, a part of which can meet the specified test conditions.
temperature setpoint The desired temperature set by the test chamber control device.
After achieving temperature stability, the temperature at any point in the chamber of the test chamber.
The temperature of all points in the work room reaches the temperature setting value and is maintained within the given tolerance range.
temperature fluctuation: The difference between the highest and lowest temperature at any point in a workspace during a given interval of time after it has stabilized.
working space A part of the test chamber that can maintain specified conditions within a specified tolerance range.
After the temperature gradient is stabilized, the maximum difference between the average temperature of any two points in the working space is obtained at any time interval.
temperature rate of change The rate of change between two given temperatures measured in the center of the low-pressure chamber workspace, expressed in ° C /min.
After the temperature variation in space is stabilized, at any time interval, the difference between the average temperature in the center of the working space of the low-pressure test chamber and the average temperature at other points in the working room.
Constant temperature and humidity machine limit temperature (
Matters needing attention
Handling of special tests:
1. The machine is equipped with a test hole on the side, which can be used when connecting to the test line in the box.
2. If you want to observe the changes in the box during the test, you can turn on the indoor LIGHT switch and know the changes inside the window.
3. If the machine is running below 0 ° C, it should try to avoid opening the door, because when it is low temperature, if the door is opened, it is easy to cause the internal evaporator and other parts of the ice sealing phenomenon, especially the lower the temperature, the more serious the situation, if it must be opened, it should try to shorten the opening time.
4. When the low temperature operation is completed, be sure to set the temperature condition of 60ºC for drying treatment for about half an hour, so as not to affect the measurement time or icing phenomenon of the next operating condition.
5. The radiator (condenser) of the refrigerator should be maintained regularly and kept clean.
6. The water inlet pipe of the humidifier barrel must be completely discharged of the air retained to prevent water from entering.
★ Special attention: when the machine completes the low-temperature operation, if no. 6 work, it is also necessary to set the normal temperature condition (30±5ºC) so that the temperature in the box is normal temperature when the machine is shut down, so as not to affect the freezing phenomenon caused by the temperature in the box is very low, and the window glass fog phenomenon.
7. During the operation, unless absolutely necessary, please do not open the door, otherwise it may lead to the following adverse consequences:
- It is very dangerous for hot and humid air to rush out of the tank.
- The inside of the door is still holding high temperature causing damage.
- Hot air may trigger a fire alarm and cause misoperation.
8. Please note that the machine must be securely grounded to avoid electrostatic induction.
9. Avoid turning off and on the freezer unit within three minutes.
10. If the heating test material is placed in the box, the test material power control please use the external power supply, do not directly use the local power supply.
11. Circuit breaker, temperature overtemperature protector, to provide the machine test products to the operator's safety protection, so please check regularly.
12. The correct installation of wet gauze can ensure that the correct relative humidity is measured.
13. It is absolutely prohibited to test explosive, combustible and highly corrosive substances.
14. Please read the controller manual and related instructions before operating the constant temperature and humidity machine.
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