AVO 569001 User manual

Instruction Manual
AVTM56-9J Rev. A
For the
Ultrasonic Corona
and Leak Detector
Catalog Number 569001
and Accessories
P.O. BOX 9007, VALLEY FORGE, PA 19485-1007 ! 1-800-723-2861

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Instruction Manual 56-9J
for the use of
ULTRASONIC CORONA
and LEAK DETECTOR
Catalog Number 569001
AVO International
P.O. Box 9007
Valley Forge, PA 19485-1007

TABLE OF CONTENTS
FIG. 1: ULTRASONIC CORONA AND LEAK DETECTOR CAT. NO. 569001 ..a1
FIG. 2: ACCESSORY ITEMS. ...........................................................................a2
INTRODUCTION ............................................................................................... A1
SAFETY PRECAUTIONS .................................................................................. B1
RECEIVING INSTRUCTIONS ........................................................................... C1
DESCRIPTION AND SPECIFICATIONS........................................................... D1
OPERATION...................................................................................................... E1
APPLICATION ....................................................................................................F1
MAINTENANCE................................................................................................. G1
WARRANTY AND REPAIRS ............................................................................. H1

a1
FIGURE 1: ULTRASONIC CORONA AND LEAK DETECTOR CATALOG NO. 569001

a2
Contact Probe, Catalog No. 569001-8
FIGURE 2: ACCESSORY ITEMS.
Ultrasonic
Tone Generator,
Catalog No.
569001-7

A1
Section A
INTRODUCTION
Electrical discharges from a high voltage terminal to the air (corona) or along an
insulated surface generate acoustical signals. Over a wide range of
circumstances a significant portion of the generated signal energy will have
frequencies above the range of the human ear. This is the ultrasonic frequency
range and may be used to detect the presence of corona or surface discharge
with the advantage that audible background noise is excluded.
Corona and surface discharge are localized to small areas relative to the total
size of the equipment. The Biddle Cat. No. 569001 Ultrasonic Corona and Leak
Detector is equipped with a highly directional horn to permit the user to localize
the source of the electrical discharge while remaining at a safe distance from the
electrical terminals. This directional property also increases the sensitivity of the
detector and tends to exclude any ultrasonic signals not related to the test in
progress. The Cat. No. 569001 is effective in locating corona on insulators,
bushings, and potheads in energized circuits such as utility poles, non-enclosed
switchgear, bus bars or transformers and aids in isolating multiple sources
located on the equipment under test. It is also useful in checking insulation test
setups for either ac or dc to determine if corona is present on the test terminals.
Pinpointing such corona and demonstrating its reduction will usually result in
considerable saving of testing time and assist in obtaining reliable results.
The Detector is designed for easy use. It is supplied in a compact light-weight
carrying case; it operates on a single transistor battery and is quickly ready for
service in the field or on the test floor.
In addition to detecting corona sources, the Detector is an excellent tool for
locating gas leaks and other sources of ultrasound.

A2
Section A
INTRODUCTION (Cont’d.)
When ultrasound is generated in parts of a container or assembly, the surfaces
of the container usually transmit the ultrasonic sound but may not radiate
effectively. For such cases the Cat. No. 569001-8 Contact Probe accessory is
available. This probe makes direct contact with the surface to detect the
ultrasound, similar to the action of a stethoscope. The contact probe is used to
identify such problems as defective bearings or gears, or leaking steam traps.
Ultrasonics can also be used to detect leaks in a sealed container before it is
filled. (This can be a significant cost saving.) The container can be considered, in
the general sense, as any enclosure where a leak may be damaging. For such
applications, the Cat. No. 569001-7 Ultrasonic Transmitter is available. In effect,
the transmitter is sealed in the enclosure or container while it is transmitting.
Since ultrasonic sound will escape through remarkably small openings, the
detector is used to scan the outside to locate the leak.