Electronic Leak Detectors

Electronic Halogen Leak Detector:

Electronic leak testers can accurately locate leaks in areas that are difficult to test with liquid leak detectors due to poor visibility or inaccessibility.

J 39400 is a small unit which operates on 12 volts DC and provides an audible signal which increases in frequency as R-12 or R-134a is detected. The unit has three settings: one for R-12, one for R-134a and GROSS. The gross setting is for locating the source of very large leaks already found at one of the other low settings.

Care must be taken that the detector is properly calibrated following instructions included with the unit and that the detector is used at the correct setting for the type of refrigerant in the system being tested.

The successful use of J 39400 or any other electronic leak detector depends greatly upon the scan rate and upon carefully following the manufacturer's instructions regarding calibration, operation and maintenance.

During testing, each joint must be circled completely moving the detector probe at 1-2 inches per second with tip of the probe as close to the surface as possible, but no more than 1/4 inch away and without blocking probe tip air intake. A leak is indicated when the audible tone goes from a steady 1-2 clicks per second to a solid alarm. The balance knob should be adjusted frequently to maintain the 1-2 clicks per second rate.

NOTE: Halogen leak detectors are sensitive to windshield washing solutions, many solvents and cleaners, and some adhesives used in the vehicle. Care should be taken to prevent a false warning by making sure surfaces are clean. Also, surfaces should be dry since ingestion of liquids will damage the detector.

- To assure no gases are present that may cause a false warning, blow out engine compartment with an air hose prior to testing.

- When using halogen leak detectors, remember that R-12 is heavier than air. Therefore, very small leaks may be detectable only if the detector tip is held BELOW the joint or other area being tested.

WARNING: Care should be taken to avoid personal injury which could occur due to touching a hot engine during testing. Test should be done with the engine OFF and as cool as possible. Do no operate the detector in a combustible atmosphere since its sensor operates at high temperature.