The propane torch detector works by
burning small amounts of R-12. In doing so,
phosgene gas is produced. Phosgene gas can
result in fatal injury; therefore, use this device
in well-ventilated areas only.
The propane flame draws the leaking refrigerant
over a hot copper alloy reactor plate, and a marked color
change of the flame occurs if refrigerant is present.
Figure 13-17.Typical electronic leak detector.
This type of leak detector is the one most widely used
today (fig. 13-17).
The vehicles engine must not be running
when making this test.
PROPANE TORCH DETECTOR
To conduct this test, you should take the following
The propane torch detector shown in figure 13-18
1. Open the propane valve and light the torch.
is still used in the air conditioning field; however, it is
2. Adjust the flame just
rapidly being replaced by electronic devices.
reaction to a cherry-red color.
high enough to heat the
Figure 13-18.Flame type of leak detector.