This paper mainly introduces how to check whether there is leakage when using refrigerant.

Visual leak detection

   when oil stains are found somewhere in the system, this may be the leakage point.

   visual leak detection is simple and easy, without cost, but it has great defects. Unless the system suddenly breaks the big leak point and the leakage of the system is liquid colored medium, the visual leak detection can not locate.

Leak detection with soapy water

   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 a very common leak detection method in roadside repair shops, but people's arms are limited, and people's vision range is limited, and most of the time, there is no leakage point

Leak detection with nitrogen water

   fill the system with 10-20kg / cm2 pressure nitrogen and immerse the system in water. The bubbling point is the leakage point. This method is essentially the same as the previous soap 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, resulting in the corrosion of the materials in the system. At the same time, the high-pressure gas may cause greater damage to the system, and the labor intensity is also great when leak detection is carried out, which makes the cost of maintenance and repair increase.

Halogen lamp leak detection

   light the leak detection lamp and hold the air pipe on the halogen lamp. When the pipe orifice is close to the leakage of the system, the flame color changes to purple blue, which indicates that there is a large amount of leakage. In this way, there is open fire, which is not only very dangerous, but also harmful gas will be produced by the combination of open fire and refrigerant. In addition, it is not easy to accurately locate the leakage point. So this method is rarely used now, if you can see, it may be in the stage of uncivilized society.

Leak detection by differential pressure of gas

   the pressure difference inside and outside the system is used to amplify the pressure difference through the sensor and express the leakage detection results in the form of digital or sound or electronic signal. This method can only "qualitatively" know whether the system is leaking, but can not find the leak point accurately.