Special Information for Automotive Technicians
INFICON’s D-TEK Refrigerant Leak Detector Model #703-005-GX is
designed certified by MET Laboratories, Inc. to meet SAE J1627,
“Rating Criteria for Electronic Refrigerant Leak Detectors” for R12,
R22, and R134a. The following SAE Recommended Practice
applies to this instrument and to the use of generally available
electronic leak detection methods to service motor-vehicle passen-
ger-compartment air-conditioning systems.
1. The electronic leak detector shall be operated in accordance
with the equipment manufacturer’s operating instructions.
2. Leak test with the engine
not
in operation.
3. The A/C system shall be charged with sufficient refrigerant to
have a gage pressure of at least 340 kPa (50 PSI) when not in
operation. At temperatures below 15˚C (59˚F) leaks may not be
measurable, since this pressure may not be reached.
4. Take care not to contaminate the detector probe tip if the part
being tested is contaminated. If the part is particularly dirty, it
should be wiped off with a dry shop towel or blown off with shop
air. No cleaners or solvents shall be used, since many elec-
tronic detectors are sensitive to their ingredients.
5. Visually trace the entire refrigerant system, and look for signs of
air conditioning lubricant leakage, damage, and corrosion on all
lines, hoses, and components. Each questionable area shall be
carefully checked with the detector probe as well as all fittings,
hose-to-line couplings, refrigerant controls, service ports with
caps in place, brazed or welded areas, and areas around
attachment points and hold-downs on lines and components.
6. Always follow the refrigerant system around in a continuous path
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