SubSurface Leak Detection LD-12 Professional's Plus User manual

LD-12 Professional’s Plus
Water Leak Detector
Operating Instructions
Headphones Jack
LD-12
Quick Reference
Guide
WARNING! Do not drop the sensor hard on to
asphalt, concrete, valves, or other surfaces from
2-3 feet or more. The sensor has a piezo electric
ceramic element, and it can be broken by hard
drops or harsh treatment.
3. There are 3 Low Filters and 3 High Filters.
The LD-12 user hears all of the sounds between
the two filters that are ON. All sounds that are in
frequencies lower or higher are filtered out.
6.
The meter on the amplifier is used for comparing
the loudness at different locations when the user’s
hearing can not tell which location is louder.
Adjust the Volume Control to move the meter needle
to a midrange position. Then compare meter
readings at different locations.
8.
The Limitter Switch
cuts off all sounds
greater than 110 dB
in the ON position.
The Filter-Thru
Switch bypasses
all of the filtering
in the ON position.
7.
The headphones jack is “power switched”.
If the headphones are not plugged in, the
amplifier’s power does not go ON:
5.
The amplifier has a large Meter Display, Volume
Control, Adjustable Filters, ON/OFF Power Switch,
Battery Power Switch, and a Light Switch:
4.
LD-12 Professional’s Plus Water Leak Detector
includes accessories for water leak “pinpointing” and
water leak “surveying”:
1.
Sensor
Cable
Jack
WARNING! The LD-12 is very sensitive and can
damage hearing if not used properly. Keep the sensor
motionless when the Mute Switch is depressed, and
keep the Volume below 25% when attaching to a
hydrant, meter, or valve that may be very loud.
2.
Ground Miking to pinpoint a leak in a
hydrant line
Leak Surveying by listening at a
hydrant with magnet base
Leak Surveying by listening at a
meter with contact rod
Standard Accessories
for LD-12
Amplifier
Side
View
Amplifier Top View Volume
Control
ON/OFF
Power
Meter
Display
Adjustable Filters Battery Power
Amplifier with Meter Display and Filter Controls
Ground Microphone and Handswitch (Mute)
Aviation-Grade Stereo Headphones
Heavy-Duty ABS Plastic Carrying Case
Magnet Base
3-Section Contact Rod
Nut Driver (to remove base)
Instruction Manual (not shown)
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2
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7

The sounds of leaks in pressurized water pipes can
travel for hundreds (even thousands) of feet in every
direction down the mains and services. If there is no
evidence of the leak, then compare the loudness
of the leak sounds at the meters, valves, and hydrants:
When you have found the two meters, valves, or
hydrants with the loudest leak sounds, you are ready
to begin the final "pinpointing". First, mark the exact
location of the pipe between the two loudest valves,
meters, hydrants, etc. with a pipe locator.
Then listen every 2-3 feet directly over the pipe.
Always check for other underground utilities like gas lines or cables
before pushing bars or rods into the ground over the pipe.
Use the magnet base on the sensor. Listen on the bar close to the
ground (less wind). Compare the loudness at all the bars with your
hearing and with the Meter Display.
Listen here to hear only outside noises.
1. Listen directly over the pipe between these two
loudest locations. Use your hearing and the meter
to determine exactly where the leak sound is loudest:
2.
With the boring bars (or push rods) touching the pipe
at 2 or 3 locations, compare the loudness of the leak:
4.
If the pipe is under soft ground or loose fill and if it
is not too deep (only 3-5 feet), then using boring bars
or push rods may be effective. Touch the pipe if
possible, but if the pipe is deep or the soil is rocky,
try to get the bars in firmly at least 2-3 ft deep.
3.
The Low and High Filters are used to filter out outside
noises of wind, traffic, A/C hum, etc. If you encounter
these interferences, try the 200 Hz filter or 400 Hz filter
while listening on the same surface but 15 feet away
from the water lines:
5.
Use the 3-pronged base plate to listen directly over
the pipe beneath asphalt streets or concrete slabs.
If one bar is louder, then it is closer to the leak.
Move the other bars closer to the loudest bar and
listen again. Keep moving the bars until they are
only 5-10 ft apart and center bar is loudest. Dig.
If the filter removes the outside noise, then listen
over the pipe again and re-adjust the Volume.
Water Leak
Meter
Touch the
Pipe
Iron
Boring Bar
or Steel
Push Rod
Sensor
with
Magnet
Base
Meter Meter
Water Leak
MeterMeter Meter
Water
Pipe
15 feet
Water
Main
Hydrant
Hydrant
Service Lines
Leak
Meter Meter Meter
Meter Meter Meter
Hydrant
Valve
Hydrant
Valve
Main
Valves
Main
Valves
Water
Main
LD-12 Professional’s Plus
Water Leak Detector
How to Pinpoint Water Leaks
LD-12
Quick Reference
Guide