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RELIABILITY WIRE
- by
www.ReliabilityDirect.com |
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Vibration,
Balancing, Alignment, Ultrasound, Oil Analysis & more...
Volume 7, Issue # 1
- May, 2006 |
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In This Issue |
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New
Products: Check
out the largest
e-catalog for Condition Monitoring
Ask The Expert: How do Ultrasonic Leak
Detectors work?
What's
Hot: Seriously
Cool tools for Less than $1,000.00!
Visit our
Suite of PdM
Websites:
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New Products:
What's New at the Largest e-Catalog for
Condition Monitoring |
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The
ThermoHAWK™ Series
non-contact, pen-sized IR thermometers are extremely compact with
Keychain attachment and digital display
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Easy-Laser BTA Digital 2 is the perfect tool for accurate sheave
and pulley alignment. Mounted in a few seconds, immediately showing
the offset and angle between the sheaves/pulleys, making it very
easy to correct the misalignment with a "live" digital readout.
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The
Ex-GSM 01 Cellular Phone is FM Certified for use in Class I Div
2 environment.
The Ex-GSM 01 supports the GSM standard for wireless communication,
such as calls, messaging and browsing. The integrated push-to-talk
function provides direct voice communication comparable to two-way
radios (depending on your network operator or service provider). The
included headset HS-8 allows hands-free conversation inside and
outside the Ex-hazardous area.
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EXTECH 382075 3-Phase True RMS Clamp-On Power Analyzer
Measures, computes, and displays 3-Phase
Power on balanced or unbalanced loads.
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Ask The Expert:
How do Ultrasonic Leak Detectors work?
Courtesy of Superior Signal, Inc.
- makers of the AccuTrak series of leak detectors. |
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The
principle of operation of
ultrasonic leak
detectors is based on turbulent flow. For a leak to happen there
must be an opening in the system that carries a gas or fluid. Normally,
these openings are not clean smooth holes, but passages through cracks
with many jagged edges and internal chambers. Fluid or gas escaping
through an "orifice" like this, is forced into turbulence (random
circular-like motions).
Turbulent flow has a high content of ultrasound. This is sound which is
above the human hearing range, but can be heard with the detector, and
traced to its source. It is important to remember that a piece of
straight tubing connected to a gas supply and left free to exhaust into
the atmosphere will not generate sound if the volume of gas through it
is such that turbulence does not take place. Yet for that same flow, an
opening as small as 0.005 of an inch could generate enough sound to be
heard several feet away.
The intensity of sound generated at a leak is a very complex function of
the viscosity, the temperature, the speed the fluid is moving, the
Raynolds number, the pressure differential across the leak, and the
physical dimensions and characteristics of the orifice. This is why it
is possible for a smaller leak to generate more sound than a larger one.
Ultrasonic leak detectors "hear" leaks, therefore the sensitivity can
not be accurately stated in terms of cc/sec, parts per million, or
ounces per year. The proper specification for these types of detectors
is decibels. The amount of sound pressure created by the leak will
determine its ability to be detected ultrasonically.
When comparing to gas specific detectors which are extremely sensitive,
remember, the instrument was tested under controlled laboratory
conditions, and the ability to actually locate small trace gases,
especially in a windy outdoor environment is extremely limited. It is
physically impossible for an ultrasonic detector to locate a leak such
as .5oz per year because there is no turbulent gas flow involved. A leak
of .5 oz. per year is equivalent to a loss of 1 pound in 32 years!
Realistically, an ultrasonic detector will detect most of the leaks you
encounter on a regular basis. It is the only instrument which will
pinpoint a vacuum leak, or detect any pressurized gas in any system. It
is also more accurate for detecting larger leaks because its sensor will
not become saturated or false alarm from the presence of gas in the
atmosphere. Because ultrasonic detectors do not "sniff" out the gas,
they can easily locate a leak under windy conditions. |
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What's Hot:
Seriously Cool Tools for
less than $1,000.00 |
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The
RH101 monitors Relative Humidity and Temperature in factories,
clean rooms, offices, and greenhouses.
Takes non-contact Infra Red surface temperature measurements in hard
to reach areas such as heating and air conditioning ducts.
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The
EX-470 is a combination
True RMS
Autoranging Multimeter and IR Thermometer.
Download Demonstration Video
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Easy-Laser® BTA compact is the perfect tool for sheave and
pulley alignment. Mounted in a few seconds, the laser line projected
onto the targets allows you to quickly ascertain and correct the
misalignment.
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Oil Safe® is the professional lubricant storage and dispensing
system that makes topping up and re-filling easier, faster, safer
and cleaner.
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The
H-4 DC Safety
Lamp
is a powerful flashlight certified for
use in explosive-hazardous areas.
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May Contest:
Answer and you may win a
ThermoHAWK IR Thermometer! |
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SKF has introduced a new improved
performance automatic lubricator. The new
System 24
offers:
- Increased reliability at high
temperatures
- Intrinsically Safe for use in
hazardous areas (including mines)
- Easy to remove end cap
- Simpler installation
- Flexible time setting period
ranging from 1to 12 months.
- Offer in two sizes: ___ ml and
___ ml
Send your answer to
dgallagher@reliabilitydirect.com: Subj: May Contest |
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