This article mainly introduces what methods can be used to check for leakage when refrigerant is used.
Visual inspection for leak detection
When oil stains are found somewhere in the system, this may be a leakage point.
Visual leak detection is simple and easy, without cost, but has big defects. Unless the system suddenly breaks and the system leaks large leaks, and the system leaks liquid colored media, the visual leak detection cannot be located.
Soap water leak detection
Fill the system with 10-20kg/cm2 pressure nitrogen, and then apply soapy water to all parts of the system. The bubbling point is the leakage point. This method is currently a very common leak detection method in roadside repair shops, but the human arm is limited, and the human vision range is limited, and in many cases the leak is not seen at all.
Nitrogen water leak detection
Fill the system with 10-20kg/cm2 pressure nitrogen, immerse the system in water, the bubbling point is the leakage point. This method is essentially the same as the previous soapy water leak detection method. Although the cost is low, it has obvious disadvantages: the water used for leak detection is easy to enter the system, causing the materials in the system to be corroded, and the high-pressure gas may also cause damage to the system. Large damages, labor intensive during leak detection, which increases the cost of maintenance and repair.
Halogen lamp leak detection
Ignite the leak detection lamp and hold the air tube on the halogen lamp. When the nozzle is close to the system leakage, the flame color changes to purple blue, which means that there is a large amount of leakage. This method produces open flames, which is not only dangerous, but the combination of open flames and refrigerants will produce harmful gases, and it is also difficult to accurately locate leaks. So this method is hardly used by anyone now. If you can see it, it may be in the stage of non-civilized society.
Gas differential pressure leak detection
Using the pressure difference between the inside and outside of the system, the pressure difference is amplified by the sensor, and the leak detection result is expressed in the form of digital or sound or electronic signals. This method can only "qualitatively" know whether the system is leaking and cannot accurately find the leak point.