In order to ensure the accuracy of temperature and humidity test, China has developed temperature test equipment (such as High and Low Temperature Dampening Tester, high and low temperature impact test box, low temperature cold test) in the 1980s Box, etc.), humidity test equipment (such as High and Low Temperature Dampening Tester, high temperature and humidity test chamber, etc.) test methods national standards and technical conditions of national standards; in 2003 developed environmental testing equipment temperature and humidity calibration norms. With the release of these standards, and further led the High and Low Temperature Dampening Tester and other equipment development.
At the same time, with the development of computer networks, High and Low Temperature Dampening Tester, etc. to further achieve a programmable automation, can be connected to the computer's remote operation.
The development of the network in the 21st century did not only stay in the PC client, more to the mobile phone smart mobile side, the phone gently set the hotel, ordering, booking tickets and other life services can be achieved. So, we can be sure that in the near future, industry can also be so easy to move to our fingertips. For example, the future of high and Low Temperature Dampening Tester control can be carried out at the remote end of the phone, we are not in the office, but at home, in the car, in the travel can be achieved remote control, observe the progress and results of the test, To carry out the corresponding data processing and other operations to improve the efficiency of the test, to further shorten the product development and production cycle.
Of course, these are only ideas, but we believe that in the near future, these will certainly be achieved, but also may be more powerful than these features.
High and Low Temperature Dampening Tester requires a very wide temperature range to achieve a very wide range of humidity, usually when the test box required to run the humidity value, as long as its moisture is higher than the atmosphere, the low moisture content to use humidification , Otherwise use dehumidification.
Humidification method has steam humidification method (steam humidification), supercooled steam humidification method (spray, ultrasonic spray), surface moisture diffusion dew point method, these humidification methods are more mature, the test box can be used, dehumidification method Low temperature dehumidification method, solid moisture absorption dehumidification method, commonly used solid moisture absorbent with molecular sieve, phosphorus pentoxide, calcium oxide and lithium bromide. These substances have very low surface water vapor pressure, generally dozens of PPM can achieve very low humidity, such as molecular sieve can achieve dew point temperature -70 degrees to 10 degrees relative humidity of about 0.5% R.H. The commercial solid moisture absorption equipment has a rotor dehumidifier, it has a strong dehumidification capacity and regeneration capacity, but it is very expensive, the installation is not convenient to meet the 10 degrees 5% RH humidity, low temperature dehumidification to use -35 The following table cooler, in the dehumidification process in the surface cooler will water coagulation into a frost, fortunately the device is still a high degree of testing, can take the vacuum This design provides a possible, before doing low humidity, the first equipment Vacuum, and then filled into the box with the standard humidity of the gas, High and Low Temperature Dampening Tester can be maintained near the standard humidity in the state.
High and Low Temperature Dampening Tester In practice, the refrigeration system in the event of capillary clogging, evaporator and condenser and connecting pipe rupture or Weld, resulting in refrigerant leakage, replacement of the compressor, etc., are required to system vacuum operating. "Self-evacuation method" in the actual maintenance is very practical (especially when the door repair), but its operation skills are very strong, the operation has a certain degree of difficulty.
1, preparation tools and materials: a multimeter 1, test pen 1, a combination of screwdriver set, needle nose clamp l, vacuum pressure gauge 1, B-12 cylinder 1, about 500g refrigerant, , A set of welding tools, continued with a number of copper.
2, High and Low Temperature Dampening Tester treatment process tube: first in the distance from the compressor repair process tube sealing mouth about romm with cutting knife tube wall about 2/3 thickness, with less sandpaper around the cut, so that the surface clean To be welded And then use the tip of the nose to clamp the sealing end of 10 ~ or so, slow operation so that the copper tube at the incision appears small cracks, so that the refrigerant slowly gas leaks (to prevent the oil out of the system caused by oil), and finally High and Low Temperature Dampening Tester The end of the seal is removed. A diameter of 6mm, wall thickness of 0.5mm, length of 150 ~ about one end of the copper tube expanded into the diameter of 6.1 ~, depth 6mm shape, set the man after connecting nut, the other end into a bell mouth and the compressor repair process Tube welding.