Failure of refrigerant leakage in the test chamber The compressor of the high and low temperature test chamber draws low-temperature and low-pressure refrigerant gas from the intake pipe, and after the motor is driven to drive the piston to compress it, the high-temperature and high-pressure refrigerant gas is discharged to the exhaust pipe. Powering the refrigeration cycle to achieve a compression-condensation-expansion-evaporation (endothermic) refrigeration cycle. If the refrigerant leaks, how to deal with it? First, observe the pressure gauge on the back of the high and low temperature test chamber to see if the pressure is within the normal range. If it is lower than the normal value, it means that the refrigerant leaks. The refrigeration system performs leak detection, inputs high-pressure nitrogen into the copper tube, and uses a combination of a leak detector and soapy water to check for leaks. Usually there is only one leak point, and sometimes there are many leak points, which are relatively rare. After finding the leak point, the leak is welded and sealed by oxygen welding, and then the refrigeration system is filled with nitrogen gas for 48 hours. During the pressure keeping process, the pressure gauge pointer is not changed, indicating that the leak point has been repaired normally and nitrogen is released. The system is filled with environmentally friendly refrigerants R404 and R23, and the refrigeration system can resume normal operation. Both the standard high and low temperature test chambers and the constant temperature and humidity test chambers are cooled by air-cooled compressors. The working principle is the same as that of air conditioning and refrigeration. In the refrigeration process, refrigerant is used for refrigeration. Once the refrigerant leaks, it will The test box is shut down, and the low temperature test and the damp heat test with humidity less than 85% RH cannot be performed.
Student microscope is designed for tertiary institutions and primary and secondary schools, which convenient to observe biological slices, biological cells, bacteria and living tissue culture, fluid precipitation observation and research. It is widely used in teaching demonstration, biochemical experiments, clinical research ect. All products will have been strictly quality checked in factory before packing.
Lab Microscope,Digital Microscope,Monocular Microscope,Biological Microscope
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