Testo 557s Using the pressure leak test set up. DO NOT ! Use refrigerant to perform a leak test.

Testo 557S has a pressure leak test mode that you can turn on and it will graft and monitor the rate of leakage in a system. But you should not use refrigerant as an indicator for looking for leaks is extremely sensitive for every 1° the outside ambient temperature goes up or goes down the pressure in the system will go up or down giving you a false reading For your leak test . it is not a false reading it’s just following the rules of physics the gas laws something you learned in grammar school when the science teacher was talking and then again in junior high school in math and in science class and then again in high school your science teacher and your math teacher both went over pressure and temperature relationship of the gas laws This is why we use dry nitrogen as our to go gas when doing and performing pressure leak test.