1. High and low temperature test box It is recommended to put it at a temperature of 8 ℃ ~ 28 ℃, do not have this condition of the laboratory, to be equipped with appropriate air conditioners.

2. Adhere to the professional management and maintenance, conditional units should be sent from time to time to the supplier factory training and learning, in order to obtain professional maintenance, maintenance experience and ability.

3. Fixed every three months to clean the condenser, the use of air-cooled compressor, to regularly check the condensing fan and the decontamination dust to ensure good ventilation and heat transfer performance.

4. For the use of water-cooled compressor cooling, instrumentation World Network pointed out that in addition to the need to ensure that the water pressure and water temperature, but also must ensure that the corresponding flow, and regularly clean the inside of the condenser to obtain its continued Of the heat transfer performance.

5. High and low temperature test chamber but also regular cleaning evaporator, because the sample of the cleanliness of different levels, in the forced air circulation under the action of the evaporator will gather a lot of dust particles and other objects, so regular cleaning.

6. To clean the waterway and humidifier, if the water is not smooth, humidifier scaling will lead to humidifier dry, can damage the humidifier, it is necessary to regularly on the water and humidifier for cleaning.

7. To insist on each test after the temperature set in the vicinity of the ambient temperature, work for about 30 minutes and then cut off the power, and then clean the studio wall. Long-term downtime is not used to regularly every half a month to the product power, power can not be less than 1 hour.
High and low temperature test chamber compressor

The compression ratio is a technical representation of the pressure difference, which means that the absolute pressure at the high pressure side is divided by the absolute pressure on the low pressure side. The compression ratio must be calculated using absolute pressure values. In order to avoid the negative value of the compression ratio calculation, the absolute pressure must be used to calculate the pressure ratio, not the table pressure. The absolute pressure value can be used to make the compression ratio positive value, so it makes sense. There are five major types of compressors used in refrigeration and air conditioning industries: reciprocating, screw, rotary, scroll and centrifugal, where reciprocating is the most widely used compressor for small and medium commercial refrigeration systems. Screw compressors are mainly used for large commercial and industrial systems. Rotary compressors, scroll compressors and reciprocating compressors are mainly used for household and small capacity commercial air conditioning units. Centrifugal compressors are widely used in air conditioning systems for large buildings.