Tube Leak Detectors

To check tubes for leaks the adjustment screw should be set at maximum sensitivity. To set the adjustment screw for maximum sensitivity:
1)	Plug the vacuum inlet and pull the air supply trigger.
2)	Back cut the adjustment screw until a maximum vacuum is seen. (Approx. 18" of Hg.)
3)	Turn the screw in until a vacuum drop of 1" occurs.
4)	Tighten the nylon nut to prevent any air leaks from giving false leakage readings. The tool is now at its maximum sensitivity setting
Plug one end of tube with a rubber tube plug of correct size. Put the VLD in the other end of tube. Pull the air supply trigger. MAINTENANCE: Clean the inlet screen, orifice, or ejector if they become clogged. This is necessary when the tool no longer produces a normal reading. Do not blow compressed air into the vacuum inlet. This will damage the vacuum gauge. When reassembling be sure to use thread sealing compound, or tape on the gauge and ejector threads to prevent vacuum leaks.