High and low temperature test box basic troubleshooting method
According to the basic troubleshooting method for high and low temperature test cases, Beijing Hongda Tianmian made the following analysis:
First, the high and low temperature test box In the high temperature test, if the temperature change does not reach the test temperature value, you can check the electrical system and eliminate the fault one by one. If the temperature rises very slowly, it is necessary to look at the wind circulation system to see if the adjustment baffle of the wind circulation is normal. Conversely, check the motor of the wind circulation and check whether the operation is normal. If the temperature overshoots badly, then you need to set the PID setting parameters. If the temperature rises directly, over-temperature protection, then the controller fails and the control instrument must be replaced.
2. When the high-low temperature test box suddenly fails during the test operation, the control instrument displays a corresponding fault indication and a voice alarm. The operator can quickly check which type of fault belongs to in the troubleshooting chapter of the operation of the equipment, and then the professional can quickly eliminate the fault to ensure the normal operation of the test. Other environmental test equipment will have other phenomena in use, it must be specific phenomena, specific analysis and exclusion. The environmental testing equipment should also be regularly maintained. The condenser of the refrigeration system should be regularly cleaned. For the moving parts, lubrication should be performed according to the instructions, and the electrical control system should be regularly maintained and checked. These tasks are indispensable.
Third, the high and low temperature test chamber can not reach the low temperature test index, then you have to observe the temperature changes, the temperature drop is very slow, or the temperature rises after a certain temperature, the former must check, do low temperature Whether the studio is to be dried before the test, so that the studio is kept dry, and then the test sample is put into the work chamber and then tested. Whether the test sample in the work chamber is placed too much and the wind in the work chamber cannot be sufficiently circulated, and the above is excluded. After the reasons, it is necessary to consider whether it is a fault in the refrigeration system. In this case, it is necessary to ask professionals of Hengtai Fengke to carry out maintenance. The latter phenomenon is caused by the poor use environment of the equipment. The ambient temperature of the equipment and the location of the equipment (the distance between the cabinet and the wall) must meet the requirements (both are specified in the equipment operating instructions).
Fourth, high and low temperature box in the heat test, the actual humidity will reach 100% or the actual humidity and the target humidity is very different, the value is much lower, the former phenomenon: may be caused by dry gauze wet bulb 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. The water level controller water supply system checks whether the water supply is normal and whether the water level controller is working properly. Another possibility is that the wet ball gauze may cause the gauze to become hard due to the long use time or the purity of the water supply, so that the gauze cannot absorb moisture and dry, and the above phenomenon can be eliminated only by replacing or cleaning the gauze. The latter phenomenon is mainly because the humidification system is not working. Check the water supply system of the humidification system. Whether there is a certain amount of water in the water supply system. Control whether the water level of the humidifying boiler water level is normal and whether the water level in the humidifying boiler is normal. If all of the above are normal, it is necessary to check the electrical control system. This requires the maintenance personnel of Beijing Hongda Tianji to conduct maintenance.
Commercial Vehicle Oil Filters
During the working process of the engine, metal debris, dust, oxidized carbon deposits and gelatinous sediments and water are constantly mixed with lubricating oil. The function of the oil filter is to filter out these mechanical impurities and colloids, keep the lubricating oil clean and extend its service life. The oil filter should have strong filtration ability, small flow resistance, long service life and other properties. The general lubrication system is equipped with several filters with different filtration capacities -- filter, coarse filter and fine filter, respectively in parallel or series in the main oil channel. (In series with the main oil channel is called the full flow filter, engine work when the lubricating oil is filtered through the filter; In parallel with the shunt filter). The coarse filter is in series in the main oil passage, for full flow; The fine filter is in parallel in the main oil passage, and it is a shunt type. Modern car engines are generally provided with only a filter and a full flow oil filter. The coarse filter is used to filter the impurities with particle size above 0.05mm in the oil, and the fine filter is used to filter the fine impurities with particle size above 0.001mm.
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