Halogen Leak Detector

TOOLS REQUIRED
^ J 39400-A Halogen Leak Detector
^ J 39183-C R-134a Manifold Gauge Set
^ J 39500-50 23 Kg (50 lb) Refillable Recovery Tank

The J 39400-A Halogen Leak Detector is the most useful tool in locating refrigerant leaks. The J 39400-A is a small unit which operates on 12 V DC and provides an audible signal which increases in frequency as R-12 or R-134a is detected. There are three settings:
^ R-12
^ R-134a
^ Gross






Use the gross leak setting for isolating very large leaks already found in one of the other two settings.

Ensure that the J 39400-A instrument is properly calibrated according the instrument's instructions. Ensure that the detector is set properly for the type of refrigerant system being tested.






Prior to beginning the test, ensure that the refrigerant system is sufficiently charged for leak testing by measuring the static pressure with a gage set.
Readings in the range 413-689 kPa (60-100 psi) are acceptable to conduct a leak test.






The most common leaks are found at the refrigerant fittings or connections. Leaks can be caused by the following items:
^ Improper torque
^ Damaged O-ring
^ Lack of lubricant on the O-ring
^ Dirt/debris across the O-ring

A small piece of lint from cotton gloves or shop cloths can create a leak path across an O-ring.

The successful use of the J 39400-A and any other electronic leak detector depends on the scan rate. It also depends on carefully following the manufacturer's instructions regarding the following items:
^ Calibration
^ Operation
^ Maintenance

Each joint must be completely circled moving at 1-2 inches per second with the tip of the probe as close to the surface as possible. It must be no more than 1/4 inch away and without blocking air intake. A leak is indicated when the audible tone goes from a steady 1-2 clicks per second to a solid alarm. Adjust the balance knob frequently in order to maintain the 1-2 clicks per second rate.

IMPORTANT: Halogen leak detectors are sensitive to the following items:
^ Windshield washing solutions
^ Solvents and cleaners
^ Adhesives

Clean all of the surfaces in order to prevent a false warning. Ensure that all surfaces are dry since ingestion of liquids will damage the detector. The following items may be tested using this procedure:
^ Low and high side sensors
^ Transducers and switches
^ Evaporator inlet and outlet
^ Accumulator dyer inlet and outlet
^ Condenser inlet and outlet
^ Other connections
^ All brazed and welded areas
^ Areas showing signs of damage
^ Hose couplings
^ Compressor rear head
^ Housing joints

IMPORTANT: Always follow the refrigerant system around in a continuous path so that no areas of potential leaks are missed. Test all of the above areas to ensure that the entire system is leak free, even when a leak was already found.