Tracer TP-9367 Marksman II AM12002 - Manual (Page 11)

11
HIGH NOISE ENVIRONMENTS
In noisy environments, it may be necessary to “tune out” unwanted
signals from other areas close to where you are scanning for leaks
or defects. Begin by attaching the air probe extension over the
nose piece. When the extension is attached, the sensing angle of
the instrument is reduced, increasing the directional capability and
reducing the effects of the adjacent noise sources. This allows the
probe to become more directional.
If you suspect that your reading originates from a source other than
what you are scanning, point the probe toward the other suspected
source (it may be a compressor V-belt, discharging steam line,
etc.) and slowly decrease the sensitivity until the alarm stops. Turn
the probe back toward direction of the suspected leak or defect and
continue to scan. This step may have to be repeated as you move
around to other locations in search of leaks or defects.
If the probe is close to the internal moving parts of the equipment
and the alarm sounds, push the rubber probe against the housing
of the equipment. If the alarm still sounds, internal friction of
moving parts, not a leak source, may be causing the alarm.
TYPICAL SCANNING METHODS/TIPS
The Marksman II provides information in two ways: qualitative,
through the ability to “hear” the signature ultrasounds produced by
various types of equipment, and the ability to see the feedback
level on multiple LEDs.
The air and contact probes are used to optimize the response
depending on the type of inspection being performed. The air
probe is best used for detecting ultrasounds associated with a
pressure leak or an electrical corona, while the contact probe is
best used to detect the ultrasounds generated from within a casing
such as in a gear, bearing, pump, valve or steam trap housing.