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• Rotate the Filter switch all the way counter-clockwise so that the knob is pointing down,
towards the six o’clock position. No filter selected.
• Rotate the Coarse Sensitivity switch counter-clockwise to position L.
• Rotate the Fine Sensitivity switch counter-clockwise to position 0.
• Put on the headphones. You should immediately note the sounds from the Pickup.
• Press the Mute button to disengage the headphones.
NOTE: As you move the Pickup from one location to the next, it is suggested that you mute, in case the very
sensitive Pickup is bumped or banged into something creating a very loud condition in the headphones.
You are ready to begin the leak detection survey.
With the Pickup placed on the surface to be investigated, begin to adjust the "COARSE"
and "FINE SENSITIVITY" controls. Starting at the COARSE setting L, adjust the FINE setting
knob clockwise. If leak is not heard, or is not loud, move COARSE setting to M, and start FINE
setting at 0 again. If necessary, move COARSE to H, and adjust FINE from 0 again. Move the
sensitivity controls until the meter indicates somewhere in the upper two-thirds of its scale and
note the sounds heard in the headphones. If a leak is heard, the filter switch may be rotated to
a position which accentuates the leak and reduces background noise. Filters 1 through 11.
When moving the Pickup or during periods of excessively high background noise, it is possible
to mute the detector without disturbing the sensitivity controls by pushing the MUTE button on
the control panel.
When listening for sounds on an exposed pipe, screw the pointed probe into the bottom of the
Pickup and hold the point firmly against the pipe. Underground leaks can often be detected
more easily by pushing the pointed probe into the ground. When listening for leaks on flat
surfaces, the probe is removed, and the Pickup is placed on the surface with the three spikes
supporting it.
It is possible to familiarize oneself with the sound of a water leak by listening on a water line
and slowly turning on a faucet so that a small amount of water is discharging from it. By
alternately turning the water "on" and "off" the characteristic high-pitched hissing sound can be
heard and distinguished from other sounds on the line.
4. LEAK DETECTION METHODS
The general locality of the water leak may be indicated by a metered loss, damp spots, or
surface water. Since water from an underground leak usually travels a considerable distance
before appearing at the surface its presence usually only indicates the general area of a leak.
To narrow down the search for the leak, take readings with the leak detector on all exposed
portions of the system (fireplugs, meter boxes, valves) in the suspected area. When taking