Product Manual

Figure 3-5 Ground Microphone for Streets
Ground Microphone Base for Streets
Figure 3-5 shows a side view of the ground microphone with the three (3)
pronged base for listening on streets, pavement surfaces, or concrete slabs. The
3 prongs should rest firmly on the street's hard surface in order for sound to be
transmitted clearly to the ground microphone's sensor.
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Figure 3-6 Magnet Base for Hydrants and Valves
Magnet Base for Hydrants and Valves
Figure 3-6 shows the magnet base attached to the ground microphone without the
3- pronged base. To remove the 3-pronged base, simply unscrew the base from
the sensor. The magnet base should only be hand-tightened onto the brass screw
thread of the sensor. It should not be left loosely attached since this will create
movement and slight noises.
With the magnet base attached, the user can attach the sensor to cast iron fire
hydrants, iron water mains, iron valves, or steel water pipes and fittings. This will
enable the user to hear the sounds being transmitted through the piping.