Mini Shock/Vibration Detector
(490-0521)                  Hints and Tips            Faxback Doc. # 14529

The principle of operation is that inside the unit, there is a spring
contact which either touches (normally closed) or untouches (normally
open) a metal contact pipe.  When the unit is vibrated, the spring contact
will move and momentarily switch the circuit from closed to open and/or
vice-versa and trigger the alarm.

This is normally a closed device that will show an open if tampered with,
if the cover is open, or if the circuit has been tripped.


There are three screws on this unit--two are for connection to a normally closed loop on your alarm system and the third screw is for sensitivity
setting.  In its initial setting, it corresponds to a contact pressure of
approximately 1 gm.  If it is turned, the following are the approximate
settings--

   45 degrees....6 gm pressure
   90 degrees....11 gm pressure
   135 degrees...16 gm pressure
   180 degrees...21 gm pressure


(IR/ir-04/29/96)