11
500-17700, Rev D
Replace the Sensor
1. REMOVE two screws holding the plaque and SLIDE out the plaque.
2. REMOVE two large flathead Phillips machine screws and carefully
REMOVE the aluminum handle from the plastic base.
NOTE:
As aluminum handle is removed, it is connected to the base
via a ring terminal with brown wire screwed into the handle and
soldered into the sensor circuit board.
3. UNSCREW ring terminal from the handle and SET the handle aside.
4. Remove two Phillips machine screws holding the board to the base,
and REPLACE the board.
5. SECURE the board to the base using two Phillips machine screws.
6. GET the handle and SCREW the ring terminal to it.
7. ATTACH the aluminum handle to the plastic base using the two large
flathead Phillips machine screws.
8. ATTACH the plaque with the two holding screws.
Operational Security Considerations
The TSH provides free egress from the interior protected area, while the
electric lock secures against unauthorized entry from outside. It is
important to note that persons on the outside cannot activate the interior
release device 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 a would-be 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 TSH is more secure with
respect to the outside. To ensure this security, the user must be made
aware of the following operational characteristics:
1. 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 TSH, it is the handle itself that carries this field. The
electric field is disturbed by the near proximity of ionization from within
the body, which forms a conductive mass. It is this mass that the
sensor detects. As a proximity device, the handle is sensitive to the
closeness of the mass. For example, if a person wearing gloves
touches the handle with a finger tip, the door will generally not
release. However, if a gloved hand is wrapped around the handle in
normal use, the door will release because the conductive mass of the
hand is in much closer contact with the handle.
