Ultrasonic Leak Detector

^ The ultrasonic leak detector is housed in the foam insert in the tester case.

^ Check the 9V battery in the detector for proper installation. The LED will indicate power.

^ Connect the headset to the ultrasonic leak-detector by inserting the headset plug into the socket in the detector.

^ Depress the on/off button to switch on the detector.

^ There is a volume control built into the cable between the headset and the detector. Set the volume control at maximum.

^ Test the detector by making a small noise, e.g. rubbing fingers together, in front of the detector.

^ Adjust the volume control to allow the wearing of the headset without hearing discomfort.

Note:
The inaudible vibrations caused by an escape of gas are translated into sound by the detector, so that the leak can be traced.

^ Point the detector at the suspected leak, keeping within an 1/2 in. to 2 in. radius of that area.

^ The hissing noise should rise and fall in volume as the detector passes over the leak.

^ If a leak is found, repair1 and then recheck the system for further leaks.

Note:
Gas pressure in the EVAP system must be maintained during the test for leaks since low gas pressure could inhibit leak detection.