It has already entered deep winter, and we are familiar with the need for maintenance of high and low temperature test chambers at room temperature. In cold winter, the high and low temperature test chambers need more maintenance.
Therefore, the winter maintenance measures for high and low temperature chambers are mainly focused on the following four aspects: selection measures, thermal insulation measures, heat tracing measures and maintenance measures.
1. Model Selection
Select the instrument with thermal insulation device. According to the type and purpose of the instrument and the geographical location to be installed, put forward the requirements for thermal insulation and antifreeze of the instrument, and then submit it to the manufacturer for treatment. In some places in the north, the temperature difference between day and night is too large, and it can reach more than - 20 degrees at night.
2. Thermal insulation measures
Thermal insulation materials shall be used for insulation, that is, thermal insulation materials shall be used to wrap the parts of the instrument that are easy to freeze or are afraid of freezing. When winter comes, check and drain frequently to prevent damage of packaged insulation materials.
3. Heat tracing measures
The steam tracing measure is to use pipe steam heating for insulation. The steam does not need to be too hot. The heat preservation steam volume can be adjusted according to the weather temperature changes. If the temperature is too high or too low, the condensate in the transmitter impulse pipe will vaporize and affect the transmitter operation. At the same time, check whether the steam insulation pipeline is unblocked or blocked before steam transmission in winter.
Secondly, electric heating belt measures are taken: electric heat tracing insulation technology is a new heating technology that directly converts electric energy into heat energy. Add thermal insulation cable, wind the tracing band on the instrument or stick it inside the instrument cabinet.
4. Maintenance measures
① The installation site shall be reasonably selected for installation measures: dry place without rain and snow leakage.
② If conditions permit, special personnel shall be assigned to conduct technical confirmation and disposal on whether the insulation materials are damaged and whether the steam pipeline is blocked every day.
③ Alarm measures If conditions permit, small audible and visual alarm devices in the state of steam leakage or power failure can be installed to facilitate the discovery and timely treatment of hidden dangers of thermal insulation and antifreeze measures.
④ Patrol inspection measures shall be regularly carried out by the person in charge of regional instrument maintenance according to the scheduled patrol route. During the patrol inspection, check whether the insulation pipeline valve is normal, whether the insulation chamber is normal, whether the drainage device is normal, whether the insulation material package is intact, and whether the electric tracing power supply components are normal. Focus on the inspection of the instruments of the devices that are easy to freeze, make the inspection records, carry out the dry, complete and clean maintenance of the instruments and their thermal insulation and antifreeze measures, and timely solve the thermal insulation and heat tracing problems that occur on the site.
⑤ Prevent the water from circulating due to icing.
a. Use high-purity refrigerant. If the refrigerant is filled with too much water, it will cause ice blockage.
b. Check whether the drying filter is aging. If it is aging, replace it in time, otherwise it will lose its proper drying and water absorption function and cause icing.
C. Check and maintain the water storage in the humidifier, which shall be replaced once a month to ensure clean water quality. The humidification water pan shall be cleaned at least once a month to ensure smooth water flow.
At the same time, it is dry and dry in winter. The circuit control system and some components of the test equipment are easily affected by static electricity, which may affect the test results, or cause static breakdown and make the equipment unable to operate. During the normal maintenance of the test chamber, you should also pay attention to taking anti-static measures for your equipment to reduce the occurrence of static electricity. The following methods can be referred to:
1. Maintain the humidity of the environment of the test chamber: generally, static electricity is caused by the drying of the component surface. Increasing the humidity of the laboratory environment can reduce the probability of static electricity. When increasing the ambient humidity, pay attention to that the humidity should be within the specified range.
2. Hand washing is required before operating the equipment. If the staff directly operate the equipment with dry hands, static electricity may be caused. In addition, operators can also wear anti-static bracelets to avoid static electricity.
3. Ensure that the equipment is well grounded. This is because when the equipment is running, there will be friction in one way or another. The friction process may produce static electricity. When the equipment is well grounded, even if there is a small amount of static electricity, it will quickly disappear through the ground wire.
At the same time, if there is no dust on the circuit of the test chamber, a large area of electrostatic breakdown will occur and cause a fault when encountering static electricity. Therefore, we hope that you can avoid the occurrence of static electricity through the above methods. At the same time, the maintenance of the equipment should also be continued to avoid a large amount of dust adhering to the equipment and components.
To sum up, in winter, in addition to the impact of low ambient temperature on equipment and components, the test equipment should also be protected against static electricity and preventive measures should be taken as early as possible. Only by protecting the test chamber equipment from all aspects can we accept the test of cold winter and facilitate our reliability testing.
