2.12 BALANCED MAGNETIC SWITCH (BMS)
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NOTE: Determine the type, number, and locations of
BMS's and show them on the drawings.
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Provide BMS detectors as shown on the drawings. The BMS shall detect a
6 mm
1/4 inch
of separating relative movement between the magnet and the switch
housing. Upon detecting such movement, the BMS shall activate and generate
an alarm. BMS detectors shall meet the following requirements:
2.12.1 BMS Subassemblies
The BMS shall consist of a switch assembly and an actuating magnet
assembly. The switch mechanism shall be of the balanced magnetic type or
triple-biased reeds to provide detection of tamper attempts. The switches
shall provide supervision and pry tamper capability. Each switch shall be
provided with an overcurrent protective device, rated to limit current to
80 percent of the switch capacity. Switches shall be rated for a minimum
lifetime of 1,000,000 operations. The magnet assembly shall house the
actuating magnet.
2.12.2 Housing
The housings of surface mounted switches and magnets shall be made of
nonferrous metal and shall be weatherproof. The housings of recess mounted
switches and magnets shall be made of nonferrous metal or plastic.
2.12.3 Remote Test
A remote test capability shall be provided. The remote test shall be
initiated when commanded by the alarm annunciation system. The remote test
shall activate the sensor's switch mechanism causing an alarm signal to be
transmitted to the alarm annunciation system. The remote test shall
simulate the movement of the actuating magnet relative to the switch
subassembly.
2.12.4 Access/Secure
The BMS and all access/secure equipment for ACP facilities shall be
provided by the contractor and wired to the local interface point at the
ACP for the Installation's CSMS as shown on the drawings.
2.13 DURESS ALARMS
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NOTE: Determine the type, number, and locations of
duress alarms and show them on the drawings. Edit
out the appropriate subparagraphs below for the
types not required.
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Duress alarm switches shall provide the means for an individual to covertly
notify the alarm annunciation system that a duress situation exists.
Provide the number and type(s) of the following Duress Alarms as required
on the drawings:
SECTION 34 41 26.00 10 Page 39