Some common faults and troubleshooting methods for high and low temperature alternating heat and humidity test chamber

Some common faults and troubleshooting methods for high and low temperature alternating heat and humidity test chamber

In the daily life of high and low temperature alternating heat and humidity test chamber, if there are some faults in use, how to urgently eliminate the fault!

â—†High and low temperature alternating heat and humidity test chamber In the high temperature test, if the temperature change does not reach the test temperature value, the electrical system can be inspected and the faults can be eliminated one by one. If the temperature rises very slowly, it is necessary to check the air circulation system to see if the regulating baffle of the wind cycle is normal. On the contrary, check whether the motor of the wind cycle is running normally. If the temperature is too high, you need to set the PID setting parameters. If the temperature rises directly and the temperature is over-protected, then the controller fails and the control instrument must be replaced.

â—†The low temperature and low temperature alternating heat and humidity test chamber can not reach the test index, then you must observe the temperature change, the temperature drop is very slow, or the temperature has a rising trend after the temperature reaches a certain value, the former should check it. Whether to dry the working chamber before the low temperature test, keep the working chamber dry, and then put the test sample into the working room and then test it. If the test sample in the working room is placed too much, the wind in the working room cannot be fully circulated. After eliminating the above reasons, it is necessary to consider whether it is a fault in the refrigeration system. The rotor pump should be inspected by professional personnel of the manufacturer. The latter phenomenon is caused by the poor use of the equipment. The ambient temperature at which the equipment is placed and the location where it is placed (the distance between the rear of the cabinet and the wall) must meet the requirements (as specified in the operating instructions for the equipment).

â—†High and low temperature alternating heat and humidity test chamber In the damp heat test, the actual humidity will reach 100% or the actual humidity will be very different from the target humidity. The value is much lower. The former phenomenon may be caused by the drying of the gauze on the wet bulb sensor. Then, check whether there is water shortage in the water tank of the wet bulb sensor. The water level in the water tank is automatically controlled by a water level controller. Check whether the water supply system of the water level controller is normal and the water level controller works normally. Another possibility is that the wet gauze is hardened due to the long use time or the purity of the water supply, so that the gauze becomes hard and the gauze can not absorb moisture and is dry. The above phenomenon can be eliminated by replacing or cleaning the gauze. The latter phenomenon is mainly because the humidification system does not work. Check the water supply system of the humidification system, whether there is a certain amount of water in the water supply system, whether the water level control of the humidification boiler water level is normal, and whether the water level in the humidification boiler is normal. If everything above is normal, then check the electrical control system, which should be repaired by professional maintenance personnel.

â—†When the equipment suddenly fails during the test operation, the corresponding fault display prompt appears on the control meter and there is an audible alarm prompt. The operator can quickly check which type of fault is involved in the troubleshooting chapter of the operation of the equipment, and then ask the professional to quickly eliminate the fault to ensure the normal operation of the test. Other environmental testing equipment will have other phenomena in use, and it will be specific phenomena, specific analysis and elimination.

1. Be sure to check that the water level of the water tank is not too high or too little before doing the test. If the water overflows the water trap or is too low, the wet bulb test cloth absorbs water abnormally, which affects the accuracy of the wet bulb. The water level is about six minutes. The water level of the water reservoir can be adjusted to adjust the level of the water tank. It is necessary to check almost every two or three tests and add water. You can see the water pipe in front to replenish water. Without water, the machine will alarm and stop working.

2. If the machine is running below 0 °C, it should try to avoid opening the door. Because when the temperature is low, if the door is opened, the internal evaporator and other parts will be sealed. Especially the lower the temperature, the more serious the situation is. If you must open it, you should try to shorten the opening time.

3. When the low temperature operation is completed, be sure to set the temperature condition at 60 ° C for about half an hour to avoid affecting the measurement time or icing phenomenon of the next working condition.

4. The radiator (condenser) of the freezer should be regularly maintained and kept clean.

5. When the humidifier is filled into the water pipe, the remaining air must be completely discharged to prevent water from entering.

Special attention: When the machine finishes the low temperature operation, be sure to set the normal temperature condition (30±5°C) so that the temperature inside the box is normal temperature when the machine is stopped, so as not to affect the icing phenomenon caused by the low temperature inside the box, and the window glass. Fogging phenomenon.

6. During operation, please do not open the door unless absolutely necessary, otherwise the following adverse consequences may result:

- High temperature moisture is dangerous outside the box.

- The inside of the door is still holding high temperature and causing injury.

- High temperature air may trigger a fire alarm and cause malfunction.

7. Please note that the unit must be grounded safely and reliably to avoid static induction.

8. Avoid turning off and turning on the freezing unit within three minutes.

9. If the sample is placed in the box, please use the external power supply for the sample power control. Do not use the unit directly.

10. Circuit breaker, temperature over-temperature protector, provide the test products of this machine and the operator's safety protection, so please check regularly.

11. Properly install the gauze of the wet ball to ensure the correct relative humidity.

12. It is absolutely forbidden to test explosive, flammable and highly corrosive substances.

13. Please read the controller manual and related manual before operating.