Common methods of composition r404a refrigerant leak detectionVisual leak detection When you notice a trace of oil somewhere in the system, this may be the leak point. Visual leak detection is easy and cost-free, but it has major defects. Unless the system suddenly breaks a large leak point, and the system leaks a liquid colored medium, visual leak detection cannot be located.soapy water leak detectionFill 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 the most common leak detection method in roadside repair shops at present, but the human arm is limited, the human vision range is limited, and many times the leak point cannot be seen at all.Nitrogen water leak detectionFill the system with 10-20kg\/cm2 pressure nitrogen, immerse the system in water, and 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 more damage to the system. If the damage is large, the labor intensity of leak detection is also very large, which will increase the cost of maintenance and repair.halogen lamp leak detectionIgnite the leak detection lamp and hold the air pipe on the halogen lamp. When the nozzle is close to the leakage of the system, the color of the flame changes to purple-blue, which means that there is a large amount of leakage here. In this way, there is an open flame, which is not only very dangerous, but also the combination of the open flame and the refrigerant 507 will produce harmful gas, and it is not easy to accurately locate the leak point. So this method is hardly used now, and if you can see it, it is probably in the stage of uncivilized society.Gas differential pressure leak detectionUsing the air pressure difference inside and outside the system, amplify the pressure difference through the sensor, and express the leak detection result in the form of digital or sound or electronic signal. This method can only "qualitatively" know whether the system is leaking and cannot find the leak point accurately.