Product Manual

Section I
Sensor Damage and Personal Safety Precautions
WARNING!
The LD-12 can damage human hearing if it is used improperly. Always follow
these procedures for safe use:
1. Turn the amplifier volume down to twenty-five percent (25%) or
less before putting on the headphones.
2. Position the ground microphone (or sensor with magnet base)
firmly on the street or other listening surface before depressing the
mute switch.
3. Keep the ground microphone (or sensor with magnet base) and
the cable wires completely stationary whenever the mute switch is
depressed.
4. Turn up the amplifier volume to higher levels only when every-
thing is stationary and the mute switch is depressed.
5. Release the mute switch before moving the ground microphone (or
sensor with magnet base) or before attaching hydrant wrenches,
valve keys, or other tools to the piping system.
WARNING!
The LD-12 sensor inside the ground microphone is a ceramic piezo-electric
element. It can be broken if it is dropped onto concrete or other hard surfaces
from only 18 to 24 inches or if it is physically shocked in some other way. If the
piezo-electric element is broken due to harsh treatment, it must be replaced at the
owner's expense, and it will not be covered under the LD-12's warranty. The LD-
12 sensor is covered under the LD-12's warranty against manufacturing defects
and against failures during ordinary use and handling.
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