Electronic Leak Detector
The three most commonly used types of electronic leak detectors are the electrochemical sensor, ultrasonic, and dielectric. The electrochemical sensor consists of a ceramic layer covered with reactive element high temperature built-in heating element. Cm. Fig. 12-59. Contact with a halogen-bearing gas causes an electric current flows in the collection of the electrode. No need to reset detector for different refrigerants. These sensors provide such answers CFCs, I-ICFCs, HFCs, and refrigerant mixtures. Thus, the operator does not need to determine refrigerant is used. Dielectric leak detector operation principle is based on various heat conductivity of different gases. Some detectors on the basis of the dielectric difference gases. Gases pass between the plates of a capacitor. Gases act as a dielectric (insulator) for each capacitor. Different frequency oscillator indicate a leak.
In operation, the detector is enabled and configured in a normal atmosphere. Leak probe then moved surfaces suspected leak. If there is even a tiny refrigerant leakage refers to the tip.
New pair of change of resistance in the circuit. Detector gives a shrill sound or light flashes, or both.
Electronic detector is probably the most sensitive of any leak detection devices. It detects all halogenated refrigerants, except for the R-14. Electronic leak detector should not be used in areas containing explosive or flammable vapours. He uses transistorized scheme is powered from the battery. The plastic tip protection should be used only in situations that may contaminate the sounding Board.
When using an electronic leak detector to minimize the drafts. Disabling fans or other devices that cause the movement of the air. Always place the sniffer below suspected leak. Because it is heavier than air, refrigerant drifting down.
Move the tip slowly, at a rate of one centimeter per second. (This may be moving Council inch after each "thousand" word count). The Council adjusted in the atmospheric air will be only the humming. The device will squeal when the Council sniffing refrigerant. Remove the plastic tip and clean it before each use. In order to avoid clogging with dirt and lint.
Units that are sensitive to many types of refrigerants including R-134a, R-12, R-22 and R-500.
Ultrasonic leak detectors, were also widely used in the industry. These units use headphones and portable hand-held detector. Ultrasonic frequency sound waves that are beyond the human hearing. Ultrasonic leak detectors detect the sound, that steam does, he comes out of the system under pressure...
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Industrial