TIF IR-1 Infrared Refrigerant Leak Detector - Manual (Page 6)

D. Move the tip back to, and past, the first leak spot noted.
When the IR-1 indicates a second change, note that spot
on the line. The leak will be near the midpoint of the two
noted change spots.
NOTE: If the tip is held at a detected leak for more than five
seconds, the IR-1 will not detect a change.
E. The IR-1 is sensitive and can take up to 30 seconds to
clear after detecting a small amount of contaminate.
Typically, it will clear in 2 to 15 seconds.
SAE J2791 false-Trigger Test Results
Chemical Detection
Time to
Clear
(seconds)
Windshield washer solvent Yes 6
Ford spot and stain remover No -
Ford rust penetrant and inhibitor Yes 5
Ford gasket and trim adhesive Yes 6
Permatex Natural Blue cleaner and degreaser No -
Ford brake parts cleaner Yes 6
Ford clear silicone rubber No -
Motorcraft G-05 antifreeze / coolant No -
Gunk Liquid Wrench No -
Ford pumice / lotion hand cleaner No -
Ford Motorcraft DOT-3 brake fluid No -
Ford spray carburetor tune-up cleaner Yes 5
Ford silicone lubricant No -
Dexron automatic transmission fluid No -
Mineral engine oil No -