6
Model 2 is approximately 910 feet (278m).
Wind speed and direction often affect the propagation of sound from the siren. Consequently, the
direction of the prevailing wind may also be a factor to consider when selecting the installation site(s) of a small, one or
two-siren system. For example, if the prevailing wind is from the west, it may be desirable to install the siren toward
the western edge of the area to be covered.
Other factors to consider before selecting the installation site include the availability of electrical power, the
ease of installation and maintenance, and the height of surrounding obstructions.
3-2.
PHYSICAL INSTALLATION
WARNING
Moving parts could cause severe cuts or amputation. DO NOT reach into the siren openings.
A.
GENERAL
Most siren installations are one of two types; Pole Mount or Flat Surface Mount. These two configurations
make it possible to install a siren in almost any situation. If neither of the installations in this paragraph is suitable,
modification of one of the configurations described may be necessary. Contact the factory for further assistance.
A siren is typically installed 35 to 40 feet above the ground. If the installation is less than 35 feet above the
ground, the sound intensity at close range may increase, but the effective range of the siren may be reduced.
Conversely, if the siren is located more than 40 feet above the ground, the effective range of the siren may increase, but
the sound may skip over areas closer to the siren. These variables may make it desirable to test the sound coverage of
the siren at various heights and locations whenever possible. ALWAYS insure that the air intakes are clear when the
siren is being tested and when it is installed at its final location.
1. Model 2 (Pole Mounting)
A Model PMS Pole Mounting Stand is required when mounting the Model 2 on a utility pole.
The PMS consists of a mounting plate, three angle iron legs, six 1/2"-13 x 2" hex head cap screws, six
1/2"-13 nuts, and six 1/2" lock washers.
(a) Uncrate the siren and remove the siren from the shipping base.
(b) Attach the cast iron legs of the siren mechanism to the mounting plate using 3/8" lock-
washers, nuts, and bolts through the 3 slots in the mounting plate (see figure 3-1).
(c) Set the siren housing over the siren mechanism on the mounting plate. Center the housing
over the mechanism. Attach the housing to the plate using aluminum clips, 1/4" lock-washers, nuts,
and bolts through the three 3/8" diameter holes (see figure 3-1 and figure 5-8).