Europark Oost 24
Tel : ++32 3 766 02 02
E-mail : [email protected]
9100 Sint-Niklaas – Belgium
Fax : ++32 3 766 10 67
10
Operating tips
The following section includes several general operating tips, and the SAEJ1628
recommended procedure for leak detection.
1.
Adjust the sensitivity up, only when a leak cannot be found. Adjust the sensitivity down
only when resetting the unit does not allow you to „home in‟ on the leak.
2.
In areas that are heavily contaminated with gas, the unit may be reset to block out
ambient concentrations of gas. The probe should not be moved while the unit is being
reset. The unit can be reset as many times as needed.
3.
In windy areas, even a large leak can be difficult to find. Under these conditions, it is
best to shield the potential leak area.
4.
Be aware that the detector may alarm if the sensing tip comes in contact with
moisture and/or solvents. Therefore, avoid contact with these when leak checking.
SAE J1628 Recommended Procedure
NOTE: On Automotive A/C Systems leak test with the engine not in operation.
1.
The air conditioning or refrigeration system should be charged with sufficient
refrigerant to have a gauge 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.
2.
Take care not to contaminate the detector probe tip if the part being tested is
contaminated. If the part is particularly dirty, or condensate (moisture) is present, it
should be wiped off with a dry shop towel or blown off with shop air. No cleaners or
solvents should be used, since the detector may be sensitive to their ingredients.
3.
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 should 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.
4.
Always follow the refrigerant system around in a continuous path so that no areas of
potential leaks are missed. If a leak is found, always continue to test the remainder
of the system.
5.
At each area checked, the probe should be moved around the location, at a rate no
more than 25 to 50 mm/second (1-2 in/second), and no more than 5 mm (1/4 in) from
the surface, completely around the position. Slower and closer movement of the
probe greatly improves the likelihood of finding a leak (see fig.7). Any increase in
beep rate is indicative of a leak.
