Some common basic troubleshooting methods for high and low temperature testing machines

2020-02-02 00:04:56

1. In the high temperature test, when 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 air circulation is turned on normally. Otherwise, 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.

Second, the low temperature test machine low temperature can not reach the test index, then you have to observe the temperature change, the temperature is very slow, or the temperature has a tendency to rise after the temperature reaches a certain value, the former must check, do low temperature Whether the studio is dried before the test, the studio is kept dry, and then the test sample is put into the working room and then tested. The test sample in the working room is placed too much, so that the wind in the working room cannot be fully circulated. After the reason, it is necessary to consider whether it is a fault in the refrigeration system, so it is necessary to ask the professional staff of Hengtai Fengke to carry out maintenance. 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).

3. When the high and low temperature test machine suddenly fails during the test operation, the corresponding fault display prompt appears on the control instrument 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. The environmental test equipment should also be regularly maintained, the condenser of the refrigeration system should be cleaned regularly, the moving parts should be lubricated according to the instructions, the electrical control system should be regularly maintained and checked, etc. These tasks are essential.

Fourth, the high and low temperature box in the damp heat test, the actual humidity will reach 100% or the actual humidity and the target humidity are very different, the value is much lower, the former phenomenon: may be caused by the drying of the gauze on the wet ball sensor, then To 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 you should check the electrical control system, which should be checked by the professional maintenance personnel of Hengtai Fengke.

5. Solution for over-temperature alarm in the box: The over-temperature protection switch must be set to 180 Â°C to work. Solution for sample over-temperature protection alarm: The device must be fault-checked and the device can operate normally after reset. The sample over-temperature protection is divided into upper limit protection and lower limit protection, and the user can set it as needed. Solution for fan overheat alarm: The device must be allowed to resume operation after troubleshooting.

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