290A1080B
ADJUSTMENT
SCREW
ALLEN HEAD
ADJUSTMENT SCREWS
(FOR SOFTER SOUND LEVEL, TURN CLOCKWISE)
FEDERAL SIGNAL CORPORATION
Electrical Products Division
EXTERNAL VOLUME ADJUSTMENT FOR
THE MODEL 350 VIBRATORY HORN
(NOT FOR USE WITH THE 450 VIBRATORY HORN)
Vibratory horns are shipped with the volume set for maximum sound
output. However, the sound level can be reduced to any desired level
with the 3/32" hex socket set screw provided. If the horn is a Model
350, install the screw at the location shown in the figure.
Before installing the set screw, thread hex washer head thread forming
screw into the appropriate hole on the front of the horn. Remove the
thread forming screw, and thread the set screw into the threaded hole.
Use a 3/32 hex key wrench to rotate the set screw clockwise until the
desired sound level is reached.
8435A536E
Rev. E Printed 6/04
Printed in U.S.A.
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