Several types of standards need to be followed when testing in a constant temperature and humidity Test Chamber
In the case of the actual operation of the constant temperature and humidity Test Chamber, the actual operation of the appropriate constant temperature and humidity Test Chamber is conducive to the experimenters to obtain scientific research data and information. It is necessary to have a deep understanding of the function and significance of the actual operation of the scientific research constant temperature and humidity Test Chamber. In addition to the actual operation, the constant temperature and humidity Test Chamber should also be tested in full compliance with the following standards.
When conducting the natural environment test for the first time, it is necessary to understand the characteristics of the test product, test standards, test procedures and test skills required for the test, the skills and characteristics of the experimental instruments used, and the structure of mechanical equipment. . Have a certain understanding, especially the actual operation and features of the control panel. It is also necessary to carefully read the actual operation manual of the experimental instrument to prevent misuse from causing abnormal operation of the experimental instrument, thereby destroying the test sample and incorrect test data information.
Secondly, the effective selection of experimental equipment
In order to ensure the normal progress of the test, appropriate test instruments should be selected according to the different conditions of the test samples, and the effective ratio of the test samples to the effective capacity of the test box should be maintained. . For tests involving hot test samples, the volume should not exceed one-tenth of the effective capacity of the Test Chamber. The volume of the unheated test sample should not exceed one-fifth of the effective capacity of the text box.
Secondly, the natural environment test of substances often needs to be registered in the relevant test, which should be appropriately increased according to the test requirements. For example, tap water in the cold and humidity Test Chamber is inevitable, and the resistance should be reduced. Now there is a more economical and convenient mineral water on the market, and its resistance is equivalent to that of pure water.
Application of cold and humidity Test Chamber
The dry bulb temperature abrasive cloth (dry bulb temperature paper) used in the cold and humidity Test Chamber is inevitable. Not all gauze can be replaced, because the air humidity reading is the difference between the root distance and the temperature and humidity. The local atmospheric pressure and wind speed levels at that time are related. The humidity range is related to the flow of water absorbed by the gauze and the volatilization state of the surface. This is directly related to the quality of the emery cloth. Therefore, the climate requires dry-bulb gauze to require a special type of "dry-bulb gauze" woven from linen.
Otherwise, the accuracy of the humidity measurement process, that is, the appropriate ambient humidity, cannot be guaranteed. In addition, the location of the dry bulb temperature emery cloth is clearly specified. Gauze length: 100mm, inseparable from the sensor camera, the camera is 25-30mm away from the environmental humidity cup, and the gauze penetrates into the cup to ensure the accuracy of the machine operation. performance and ambient humidity.
At the same time, properly place the test sample. The test sample should be placed 10 cm above the box wall, and as many samples as possible should be placed on the same plane. The test sample should not block the ventilation holes and air supply outlets, and should keep a certain distance from the temperature and humidity sensor.
Cleaning, maintenance and maintenance methods in daily work
1. Cleaning and maintenance of the external environment of the constant temperature and humidity testing machine shell. 1) The internal residues of the constant temperature and humidity Test Chamber should be removed during operation. 2) The high-low voltage power distribution room should be cleaned at least once a year. When cleaning, you can use a vacuum cleaner to suck up the dust in the room. 3) The exterior of the housing also needs to be cleaned once a year. Scrubbing with soap and liquid is sufficient before cleaning.
2. Inspection and maintenance of the air humidifier of the constant temperature and humidity testing machine. The water storage in the air humidifier should be replaced once a month to ensure that the water body is clean. The humidification basin should be cleaned once a month to ensure smooth water flow.
3. Check the overheating protection device on the constant temperature and humidity testing machine. When the constant temperature and humidity Test Chamber is running, the overheat protection setting should be increased by 20°C~30°C. When the temperature in the test box rises to the overheat protection set value, the power supply system of the electric heater is terminated, the "OVERHEAT" overheat warning light is on, but the cooling fan is still running. If running unattended for long periods of time, try checking for overheating before running. Are protective devices installed correctly? 【Dry bulb temperature overheat protection device is set to 120 ℃】.
4. Dust removal of the cooler of the constant temperature and humidity testing machine. Coolers should be maintained on schedule and monthly. Use a cordless vacuum cleaner to suck off the dust attached to the heat-absorbing wire mesh of the cooler or use a high-pressure gas spray to remove the dust.
5. Disassembly and replacement of the dry bulb temperature detection cloth of the constant temperature and humidity testing machine. The detection cloth is replaced every three months. When removing and replacing, wipe the temperature measuring body [sensor] with a clean towel. When removing and replacing a new test cloth, it should be cleaned first.
