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Electric Lock Selection
Electric lock selection is important to obtain best
results from the Securitron TSB. The product allows
silent and immediate egress without the mechanical
action of traditional exit devices which require periodic
maintenance and replacement. Having no moving
parts, the Securitron TSB possesses an extended
operating life. The product was designed for use with
Securitron's Magnalock. The Magnalock secures the
door with magnetic force only and therefore has no
Operational Security Considerations
Typical use of the Securitron Touch Sense Bar provides
free egress from the interior protected area. The
electric lock secures against unauthorized entry. It
is of important concern that persons on the outside
cannot activate the bar from the outside. This is a
common problem with other interior release devices.
For instance, if a panic bar with switch is used, it is
possible to trip it from the outside if the intruder can
introduce a coat hanger in between the door and
frame. Aluminum frame glass doors tend to allow this
more than other types. Similarly, microwave detectors
used on the inside can sometimes be activated
from the outside if the door is vibrated strongly.
The Securitron Touch Sense Bar is more secure with
respect to the outside. To assure this, however, the
user must be made aware of certain operational
characteristics. The sensor functions by setting up
an oscillating electric field which conforms along any
metal surface that contacts the sensor's antenna wire.
In the Securitron Touch Sense Bar it is the bar itself
that carries the field. The electric field is disturbed by
the near proximity of ionized fluids within the body,
which form a conductive mass. It is this mass that the
bar detects. As a proximity device the bar is sensitive
to the closeness of the mass. For example, if a person
Sensor Replacement
1
REMOVE THE END CAP on the sensor side. Remove
the cable connector from the circuit board.
2
REMOVE THE TWO SCREWS that connect
the end piece to the aluminum bar.
NOTE: that this will free the ring terminal that is
soldered into the board on the pad marked, "bar". This
ring terminal is the way the sensor makes contact with
the bar. Slide the complete end piece out of the bar.
3
With the end piece now loose in your hand, PUSH
the circuit board farther into the end piece. The
direction is as if you were pushing it into the bar.
There will be some resistance from the wires that
connect the backup switch to the circuit board.
Push it only far enough to completely reveal
the rectangular body of the backup switch.
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possibility of jamming and thereby denying egress. The
Magnalock also has internal electronics which allow it
to release very rapidly. When used with the Securitron
TSB, which is also a fast device, exit is immediate and the
impression a person exiting gets is that the door is not
locked at all. Other magnetic locks generally operate
significantly more slowly than the Magnalock. This
makes egress less convenient as a person must pause
somewhat after touching the bar until the door releases.
wearing gloves touches the bar with his finger tip,
the door will generally not release. When the gloved
hand is wrapped around the bar in normal use, the
door will release because the conductive mass of
the hand is in much closer contact with the bar.
The main security concern regarding outside entry
is if a person could introduce a metal wire from the
outside and make metal to metal contact with the
bar. The field could then propagate along the wire
and be activated by the intruder's hand. In practice,
this is unlikely. The bar is anodized and therefore
insulated so it will not make contact with the wire. The
intruder would have to scratch away the anodization
which requires both effort and knowledge. Also
the field propagates weakly along a thin wire.
If, however, high security from the outside is critical
in the application, two steps should be taken.
1
The sensitivity of the bar should be set as low as
satisfies the exit performance requirements.
2
The insulation on the bar should be increased by
painting it. This significantly increases resistance
to scratching. Electrostatic (powder coat) paint
is recommended for greatest toughness.
4
UNSCREW the cap that holds the backup switch
to the end piece. Push up the freed backup switch.
Now the complete sensor + backup switch can
be slid away from the end piece by continuing
to slide the board in the same direction.
5
To INSTALL the new sensor assembly,
reverse the procedure detailed above.
NOTE: that the wires that connect the backup push button
to the circuit board must be folded over in the center of the
board- inside of the potentiometer. If the wires are allowed
to fold outside the potentiometer, they will block access
to it and the board will not be able to slide fully forward.
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