POWER June 2016 - 20

Ultrasonic Diagnostic Tool
Detects Leaks, Bearing
Wear, and Corona
Discharge
Air leaks cost money. According to the
U.S. Department of Energy (DOE), over
$5 billion per year is spent on energy to
power compressed air systems. The DOE
estimates that optimizing these systems
could improve energy efficiency 20% to
50%, and part of optimization includes
finding and fixing leaks. In addition to
costing money, natural gas and propane
leaks can be dangerous, so finding and
fixing those are even more important.
Noise is always generated when pressurized
systems leak. The problem is that when the
leaks are small, the noise may not be audible
to humans. However, ultrasonic diagnostic
tools, such as the Spectroline MDE-2000NC
Marksman II (Figure 2), can detect low-level
noise from even the smallest leaks. Thus, with
a receiver and a little training, technicians
can find and fix nearly any leak.
Finding Leaks
Finding leaks with the Marksman II is fairly
easy. You simply turn the receiver on,
adjust the volume on the touch control
pad, and scan all suspected leak areas. An
audible alarm intensifies and a series of
LED indicators illuminate on the receiver
as you get closer to the leak.
Noisy environments can make finding
leaks more difficult, but the Marksman II includes
a hollow air probe and noise-canceling
headphones to solve that problem. The
air probe reduces the sensing angle, limiting
the amount of ambient noise that gets
into the receiver. The headphones muffle
the ambient noise and also cut off the audible
alarm, initiating the unit's advanced
heterodyne and sound signature technologies.
When leaks are detected in this state,
a natural sound similar to what you would
expect to hear from a leak is produced.
The tool can also be used to find nonpressurized
leaks, such as leaks that pass around
faulty seals, gaskets, weather stripping,
doors, windows, ductwork, and other enclosures.
To check these types of components,
a technician would place the ultrasonic
emitter that comes with the kit inside the
enclosure. The emitter produces ultrasonic
beeps that are tuned to the frequency of the
receiver. By scanning component seal areas,
the beeping signal will lead to the exact
spot where the leakage is occurring.
Bearing Wear and Electrical Problems
Ultrasonic tools can do more than just
find leaks. The Marksman II can quickly
pinpoint premature component wear using
18
2. Ultrasonic diagnostic tool. The Marksman II is one example of a tool for finding
leaks and more. The kit contains an ultrasonic receiver, ultrasonic emitter, hollow air probe,
contact probe, and noise-canceling headphones. Courtesy: Spectroline
3. Hearing is believing. The contact probe allows faulty bearings or gears to be identified.
Courtesy: Spectroline
the contact probe that comes with the kit.
With the tip of the installed contact probe
touching a motor casing (Figure 3), for example,
technicians can listen for abnormal
or nonrhythmic clicks or grinding sounds.
An irregular noise indicates early-stage
bearing wear or potential gear trouble
long before actual equipment failure.
Ultrasonic tools are especially adept at
picking up the noise associated with poor
electrical connections that produce corona
www.powermag.com
discharge. To identify electrical problems
in breaker boxes, fuse panels, or other
electrical enclosures, a technician would
hold the probe several inches away, scan
around the entire panel, and listen for a
snapping or " frying bacon " sound. The
noise indicates that corona discharge is
an issue in the panel and should be more
thoroughly investigated and fixed. ■
-Aaron Larson is a POWER associate
editor.
POWER | June 2016
http://www.powermag.com

POWER June 2016

Table of Contents for the Digital Edition of POWER June 2016

Contents
POWER June 2016 - Cover1
POWER June 2016 - Cover2
POWER June 2016 - Contents
POWER June 2016 - 2
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