Megger 569001 Specifications

Ultrasonic Leak and Corona Detector

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Features compact long-distance
directional pickup

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Locates gas leaks and corona within
inches of the source

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Lightweight for easy use, even in remote
field locations

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Insensitive to high ambient audible noise
levels

Ultrasonic Leak and Corona Detector

DESCRIPTION

The Ultrasonic Leak and Corona Detector is a low-cost,
portable system that receives air-borne ultrasonic signals,
converts them to the audible range, amplifies them and
displays the output visibly on a meter and audibly through
a speaker or headset. The system is designed for locating
gas leaks and electrical corona sources, all of which emit
strong ultrasonic signals that are inaudible to the unaided
human ear. Variously shaped collectors facilitate quick
location of ultrasonic sources; in particular, the new
directional pickup horn allows pinpointing of
discharges in high-voltage equipment while the operator
remains at a safe distance.

The ultrasonic detection system shown above consists of
the instrument with indicator and speaker, plug-in
ultrasonic transducer probe, directional pickup horn
attachment, sound concentrator attachment and a headset.
A carrying case is included.

Using the Detector

With the transducer probe plugged into the instrument, the
operator can immediately locate many ultrasonic sources
by scanning with the transducer probe held as a flashlight
and using the speaker or meter to detect maximum
emissions. For greater sensitivity, or to further pinpoint a
distant source, the operator simply slips the directional
horn over the transducer. The focus is now greatly
concentrated, permitting source location to within a
1-ft (0.3-m) circle at 30 ft (9 m). If the source can be
approached, the rubber sound concentrator is slipped over
the transducer probe, pinpointing a source to within its tip
diameter of about 0.5 in. (13 mm).

Pickup Horn Operation

The pickup horn
amplifies signals
originating within
the response beam
and rejects others.

The ultrasonic transducer in the probe responds primarily
to a 35- to 45-kHz bandwidth—a range found most useful
for the tests described here. The transducer is very
insensitive to audible sounds, allowing use of the
detection system in areas with high audible background
noise levels.

The output meter, for indicating ultrasonic sound intensity,
is calibrated with a 0-to-10 linear scale, showing relative
level. Power is from a 9-volt transistor battery, and a single
on-off volume-control switch is provided.

APPLICATIONS

The Ultrasonic Leak and Corona Detector is useful
wherever electrical or pressurized equipment is used.
Applications include preventive maintenance in plants and
utilities to locate poor or arcing connections, switches,
faulty insulators, lightning arresters, power supplies,
motors and radio frequency interference sources. In the
test laboratory, the set is useful in performing high-pot
tests on components of all sizes and for high-voltage
equipment tests. Early detection of leaks by preventive
maintenance checks in compressed air systems, boilers and
air-conditioning equipment will provide savings in reduced
equipment replacement and downtime.

RESPONSE
BEAM

PICKUP HORN

TRANSDUCER

Ultrasonic Leak and Corona Detector

For Leak Detection

Where gas or air leaks produce a turbulence that creates
sonic energy, the ultrasonic detector can detect a 0.002-in.
(0.05-mm) diameter leak at 5 ft (1.5 m) with only 10-psi
pressure. The instrument can also be used to detect leaks
in vacuum systems, and to detect leakage of poisonous,
noxious, explosive or expensive gases in gas pressure
systems.

For Corona Detection

The ultrasonic detector is most useful for locating corona
sources that are exposed directly to the surrounding air,
such as on terminations, high-voltage bus systems,
bushings and transformers. The detector is excellent for
patrolling pole lines and checking all kinds of electrical
equipment for leaky insulators and faulty connections. It is
invaluable in research and development work for locating
points of excessive stress on small electrical components
and assemblies, as well as on very large equipment. The
detector is ideal for finding and cleaning up corona
discharge points on the high-voltage test floor. When used
for locating corona discharge, all suitable safety
precautions must be taken to avoid electric shock.

Features and Benefits

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Locates leaks and corona within inches of the source

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Simple and foolproof to operate

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Lightweight for easy use, even in remote field locations

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Unique directional horn extends distance ranges to
detect ultrasonics in various locations; operator uses
pistol grip and peep sight to aim at the source.

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Insensitive to high ambient audible noise levels

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Solid-state circuitry designed for high reliability, long life
and low maintenance

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Battery-powered; uses one 9-volt transistor battery

Specifications

Construction: Rugged anodized aluminum chassis protected by
a leather case
Circuitry: Solid-state heterodyne receiver with single on-off
switch and volume control
Frequency Response: Frequencies between 35 and 45 kHz are
amplified and converted into audible sounds, while sounds within
the frequency range of the human ear are not detected.
Meter: Ultrasonic intensity is indicated on a 0-to-10 linear scale
showing relative level.

Battery

9-volt Eveready No. 216 (NEDA 1604) in quick-access
compartment
Battery life is approximately 75 hours.

Dimensions (including case)

12 H x 17 W x 5 D in.
(305 H x 432 W x 127 D mm)

Weight

5.5 lb (2.5 kg)
Weight figure includes detector, transducer probe, directional
horn, sound concentrator, headset, battery and case.

Locating a leak in an air pressure
tank

The detector is excellent for
patrolling pole lines.