Goldak 777-A User manual

INNOVATING UNDERGROUND LOCATING
Model 777-A Leak Detector
PIN-POINT LOCATING
Pin-Point Underground
Leaks with Industry’s
Most Accurate and
Proven Leak Detector.
Plumbers, contractors, water works personnel, and
plant maintenance people have continually sought
specialized equipment and improved techniques for
detecting and pinpointing underground water leaks.
The Model 777-A leak detector meets this require-
ment in a simple and efficient manner, utilizing the
proven theory that leaks in water systems under
pressure create mechanical vibrations that travel
along the pipe and at right angles to it (to the sur-
face). The operator simply touches the microphone
probe to the pipe being tested and to all exposed fit-
tings, such as hydrants,shut-offs, valve stems, water
meters,faucets, etc.The microphone converts
these mechanical vibrations to electrical impulses
that are then amplified and displayed on the meter
as the “sounds” of the leak can be heard in the
headphones. The water leak is then localized by
comparing readings and sounds from a series of
detection points on the water system. Pinpointing is
accomplished by reading through the
pavement or floor using the ultra sensitive micro-
phone.
OUTSTANDING FEATURES
!Aluminum instrument housing contains circuitry,
controls and meter. Weight: 2.5 lbs
Dimensions: 3” x 6” x 10”, Batteries: 6 “AA”
!Ultra sensitive microphone to detect a wide
range of water leak sounds and convert them
into electrical impulses which are then amplified
and displayed
!Large sensitive meter to display leak “sounds”
and indicate battery condition
!Padded stereo headphones to reproduce leak
sounds and effectively shut out external noises.
!Wide-range controls to adjust amplifier gain,
meter sensitivity and filter frequency (filter range:
20 Hz - 500 Hz on “Lo”, 20 Hz - 3.5 KHz on “Hi”)
!Hi-impact foam lined plastic carrying case
(20” x 16” x 8”)
PIN-POINT LEAK DETECTION
RATED #1 FOR
RESIDENTIAL AND COMMERCIAL
SLAB LEAKS

TECH SPECS
Goldak, Inc.
15835 Monte St., Unit 104 !Sylmar, CA 91342
818/367/0149 !818/833/7694 fax !www.goldak.com
The Model 777-A leak detector is a light, durable, sensitive instrument which will quickly provide accurate
leak locations and eliminate false indications and “dry” holes. In the design of
the Model 777-A careful consideration has been given to the sounds, frequencies,and critical characteristics
of underground water leaks. The frequency filter control on the instrument
control panel enables the operator to properly match the instrument to the specific frequency of the water
leak being detected. By designing a sensitive audio circuit the sounds of the water leak are accurately recon-
structed to further assist the operator in quickly pinpointing sub-
surface water leaks.
777-A LEAK DETECTOR SPECIFICATIONS
DIMENSIONS
L 6” x H 10” x W 3”
OPERATING WEIGHT
2.5 lbs.
SHIPPING WEIGHT
16 lbs.
FREQUENCY FILTER RANGE
20 Hz - 500 Hz on “Lo”
20 Hz - 3.5 KHz on “Hi”
BATTERIES
6 “AA” Alkaline Batteries
STANDARD ACCESSORIES
Stereo Headphones
Ultra Sensitive Microphone
Mic Probe
Bell Housing
Carrying Case
Operating Manual
WARRANTY
One year on manufacturing defects
and workmanship
LEAK DETECTION PROCEDURE EXAMPLE
LEGEND
–Buried water pipe
Above ground or accessible
–direct contact points (angle
stops, hosebibs, valves etc.)
Leak intensity
–(Meter readings)
–Surface readings
1. Start by taking direct contact readings at all
available fittings. Observe the meter and listen
for leak sounds in the headphones.
2. Work toward maximum readings. For example,
the direct contact reading at point 3 shows
a leak intensity of 22 on the meter. Point 4
indicates 43, suggesting that point 4 is closer
to the leak.
3. From the direct contact readings it can be
concluded that the leak lies somewhere
between point 5 (meter reading 47) and point
6 (meter reading 54).
4. To pinpoint the leak it is necessary to take a
series of surface readings.For more accurate
results the surface reading points should be
directly over the leaking pipe.It is recommend-
ed that the pipe be traced and marked using
either the Model 5600-SI or the Model 4400
pipe locator. The surface readings can be taken
with the microphone placed directly on the
surface or with the microphone bell accessory
attached. Again,work along the pipe toward
maximum readings.
5. The peak meter reading and the highest leak
sound will occur directly over the water leak
regardless of where the water might be show-
ing on the surface.