Several common maintenance methods for high and low temperature testing machines
1. High and low temperature testing machine equipment 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.
two,. When the high and low temperature test equipment 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 belongs to the fault diagnosis chapter in 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 indispensable.
Third, the low temperature test instrument 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 should 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 chamber cannot be fully circulated. After the cause, it is necessary to consider whether it is a fault in the refrigeration system, so it is necessary to ask the professional of the manufacturer for 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 back of the cabinet and the wall) must meet the requirements (as specified in the operating instructions for the equipment).
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 ball gauze will be hardened due to the long use time or the purity of the water supply, so that the gauze can not absorb moisture and be 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.
The high and low temperature box is applied to the electronic universal testing machine for the mechanical property testing of materials in high and low temperature conditions. More high and low temperature electronic universal testing machines are available.
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