Maintenance of constant temperature and humidity test chamber

Constant temperature and humidity test box maintenance and repair constant temperature and humidity test machine is a high temperature, low temperature, damp heat as one of the test boxes - high and low temperature damp heat alternation test box Its repair is more difficult than other environmental test equipment, and it is representative The following is an example of the high and low temperature humid heat alternation test chamber, to talk about the structure of constant temperature and humidity test and some common faults and troubleshooting methods 1、 The construction of constant temperature and humidity test chamber the constant temperature and humidity test chamber is composed of box body, air circulation system, refrigeration system, heating system and humidity control system The air circulation system generally adopts the structure of adjustable air supply direction; the humidification system has two types: Boiler humidification and surface evaporation; the cooling and dehumidification system adopts the refrigeration structure of air conditioning working condition; the heating system adopts two types of structures: Electric fin heating and electric furnace wire direct heating; the temperature and humidity test method adopts the dry and wet ball test method, and also uses the direct measurement method of humidity sensor; The control and display operation interface adopts the methods of temperature and humidity independent and temperature and humidity combination controller 　　 In the wet heat test, the actual humidity will reach 100% or the actual humidity is quite different from the target humidity, the value is much lower The former phenomenon: it may be caused by the drying of gauze on the wet ball sensor, so it is necessary to check whether there is water shortage in the water tank of the wet ball 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 Whether the water supply is normal and whether the water level controller works normally Another possibility is that the wet ball gauze will harden due to the long use time or the purity of the water supply quality, which will make the gauze unable to absorb water and dry As long as the gauze is replaced or cleaned, the above phenomena can be eliminated The phenomenon of the latter is that 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 is normal, and whether the water level in the humidification boiler is normal If all of the above are normal, it is necessary to check the electrical control system, which should be repaired by professional maintenance personnel When the equipment suddenly fails during the test operation, the corresponding fault display prompt and audible alarm prompt appear on the control instrument The operator can quickly check the type of fault according to the chapter of troubleshooting in the operation and use of the equipment, and then ask the professional to quickly remove the fault to ensure the normal test There will be other phenomena in the use of other environmental test equipment, which should be analyzed and excluded specifically The high and low temperature test chamber or constant temperature and humidity test chamber shall be maintained regularly, the condenser of the refrigeration system shall be cleaned regularly, the movable parts shall be lubricated according to the instructions, the electrical control system shall be maintained and inspected regularly, etc., which are essential.