Tru Pointe® Ultra
Instruction 28-9000
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Tru Pointe® Ultra
Instruction 28-9000
Electrical Arcing
Electrical arcing is an electric current
fl
ow in air and can be a very destructive and dangerous oc-
currence in electrical systems.
To search for electrical arcing, use the same methods described to search for airborne leaks, but
scan around switches and electrical panels.
NOTE:
Electrical arcing sounds like frying, including the
occasional popping sound.
CAUTION!
Observe all all safety precautions when
working around electrical equipment. Arcing can lead to
explosions.
Electrical Corona
Electrical corona is usually observed in higher voltage systems than electrical arcing. Corona
usually occurs in insulators, substations or transmission towers.
To search for electrical corona, use the same methods described to search for airborne leaks.
NOTE:
Electrical corona sounds like frying or sizzling.
CAUTION!
Observe all safety precautions when
working around electrical equipment.
Operating Tips
1.
If the test area is large, remove the nose cone. Without the nose cone the detec-
tion area of the Tru Pointe
®
Ultra increases from 15° to 90°.
2.
If the leak is in a tight, or inaccessible area, use the supplied 1/4” tubing to deter-
mine the leak location. Longer sections of 1/4” tubing can be used at the expense
of sensitivity.
3.
Use as much pressure in the system as is safely possible to facilitate locating the
leak.
Using the Touch Probe
The patented Touch Probe accessory is a device that converts solid-borne sounds into airborne
sound the Tru Pointe
®
Ultra can detect. For example, the sound of an internal leak in a water
valve will travel to its surface. Touching the surface of the valve with the Touch Probe transfers
the ultrasound into the probe and converts it to airborne ultrasound.
To install the Touch Probe:
1.
Unscrew the nose cone from the Tru Pointe
®
Ultra.
2.
Screw the Touch Probe onto the sensor.
3.
The Tru Pointe® Ultra is now ready to detect solid-borne sound.
Thermal Expansion Valves (TXV)
The following steps can be used to detect leaks in a TXV using the Touch Probe.
1.
Have a glass of ice water ready.
2.
Remove the TXV capillary tube.
3.
Rest the Touch Probe of the Tru Pointe
®
Ultra on the TXV and listen. Hold the
capillary. The TXV should open and the sound of
fl
owing refrigerant should be
heard.
4.
Place the capillary in the ice water. The TXV should close and the refrigerant
fl
ow
diminishing should be heard. If the
fl
ow binds or makes too much noise, there
may be a problem with the system.
