PCM-2 Manual.pdf - Voss Associates

Access Control Option (PCM2 OPT5)
The access control option is a modular system of two (entry and exit, Option 5) or
one (exit only, Option 5A) hinged and locking gates which are mechanically and
electronically integrated into the PCM-2 to control personnel egress from and/or
ingress into the monitor. The system consists of the exit and/or entry gates
supported by a rugged frame with ceiling and base assemblies which match and
mount directly to the front of the PCM-2 unit. Standard system features include
500 lb electro-magnetic gate locks, thrust bearing supported swinging tubular steel
and powder coated gates, dampened gas cylinder gate return springs, emergency
exit gate lock override switch bar, audible emergency exit gate lock override
alarm and custom programmable relock/alarm time delay relay. Optional features
include audible/visual remote exit gate lock override alarm, roof-mounted local
exit gate lock override alarm strobe beacon and a remote "pull-station" for
centrally unlocking the exit gates of one or multiple PCM-2 access control unit(s).
System Operation
Personnel access through the unit is controlled by the PCM-2's main computer by
continuously monitoring contamination measurement status and assigning gate lock
commands accordingly. For example, a user enters the PCM-2 from the left-hand
side of the unit in its "ready to measure" condition through a normally unlocked
entry gate while the he/she is prohibited from exiting the unit to the right by a
normally locked exit gate. Then the user undergoes the normal measurement
cycle in both face-in and face-out body positions. If the PCM-2 posts a
contamination alarm for either of the measurements the entry and exit gates will
remain unlocked and locked respectively, allowing the user to go back to the left
through the entry gate only for frisking and/or decontamination procedures.
Conversely, if the PCM-2 posts the "All Clear, OK to Exit" display after the
measurement cycle, the entry and exit gates are simultaneously locked and
unlocked respectively and the user can then exit the unit through the exit gate to
leave the facility. In the latter "All Clear" scenario the entry gate is locked in
order to disallow potential "tailgaters" (i.e. those users who might try to slip
through the unit unmeasured on the heels of the previous uncontaminated user).
For access control units configured with exit gates only (Option 5A), this
automatic tailgating safeguard can obviously not be realized.
The PCM-2 commands the exit gate lock to be energized (locked) continuously
while the unit is turned on and operational in any mode other than when posting
the "All Clear" instrument status. The exit gate is therefore unlocked whenever
the instrument is intentionally turned off or whenever electrical power is otherwise
interrupted (i.e. in the case of a power outage). The entry gate is only locked
during the brief" All Clear" instrument status periods when in use.
----------------_ .._-----------_._-_._--_._---­
PCM2.MANI REV AI April 1995 17-29