Bacharach Tru Pointe Manual Do Proprietário

10

False refrigerant indications are usually caused by abnormal changes in 

sensor temperature. These temperature changes are typically due to a sud-

den change in air flow past the sensor, or the sensor being heated or cooled

by an outside source. To avoid false refrigerant indications, DO NOT . . .

• allow the probe tip to become clogged with dirt,

• allow the probe to suck in hot gases.

The following was derived from SAE Surface Vehicle Standard J1628,

Technician Procedure for Using Electronic Refrigerant Leak Detectors for 

Service of Mobile Air-Conditioning Systems:

• The electronic leak detector shall be operated in accordance with the

equipment manufacturer’s operating instructions.

• Leak test with the engine not in operation.

• The air conditioning system shall be charged with sufficient refrigerant

to have a gauge pressure of at least 340 kPa (49 psi) when not in opera-

tion. At temperatures below 15 °C (59 °F), leaks may not be measurable,

since this pressure may not be reached.

• 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.

• Visually trace the entire refrigerant system, and look for signs of air-

conditioning lubricant leakage, damage, and corrosion on all lines, hos-

es, 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.