CAUTION
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.
CAUTION
This type of leak detector is the one most widely used
today (fig. 13-17).
The vehicle’s engine must not be running
when making this test.
PROPANE TORCH DETECTOR
To conduct this test, you should take the following
actions:
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.
13-18
