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Special Information For Automotive Technicians
INFICON's TEK-Mate Refrigerant Leak Detector Model #705-202-G1 is
design 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 passenger
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 gauge pressure of at least 50 PSI (340 kPa) when not in
operation. At temperatures below 59 ˚F (15 ˚C) 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 electronic
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.
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