Installation Manual

To install the sensor:
1. Remove the sensor cover by pressing the button on the
narrow end.
2. Remove the batteries to access the mounting holes.
3. Mount the sensor base with two #6 flathead screws at the
locations shown in Figure 4 below. If you need to connect
ext
ernal switches, they should be installed at this point.
Use the procedure for connecting external switches.
Figure 4: Mounting hole locations (bottom view)
MOUNTING HOLES
4. Remove the magnet from its base. Line up the arrow on
the magnet with the mark on the sensor.
5. Mount the magnet base no more than 3/8-inch away from
the sensor base. Replace the magnet cover.
6. Re-install the batteries and circuit board; and attach the
sensor cover to the sensor base.
Note: When window or door construction does not allow the
transmitter to be installed next to the magnet, install an
external switch and connect it to the Door/Window Sensor.
Connecting external switches
External switches used with Door/Window Sensors allow you
to protect doors and windows when there is inadequate room
for directly mounting the sensor or when you want to locate the
Door/Window Sensor in an adjacent, but less visible place.
Materials needed
•
Hermetically sealed external switches (sealed reed switch)
that supply a minimum 250-millisecond open or closure on
alarm
• Stranded 22-gauge wire
To install external switches:
1.
Install the external switch according to the manufacturer’s
instructions.
2. Remove the cover and batteries from the Door/ Window
Sensor.
3. Feed the wires on the external switch through the rear
opening at the bottom of the Door/Window Sensor.
4. Attach each wire to one side of the screw terminal. Press
the screw terminal over the wire posts.
5. Mount the sensor.
6. Replace the batteries and sensor cover.
Programming
For complete programming instructions, refer to the NX-Series
Receiver Modules Installation Instructions.
Testing door/window sensors
Testing sensors is recommended after all programming is
completed and whenever a sensor-related problem occurs, to
verify radio signal integrity and confirm control panel
programming and response.
Note: While the sensor test is a valuable tool, it only tests
sensor operation for the current conditions. A sensor test
should be done after any change in environment, equipment,
or programming.
1. Place the system in test mode.
2. Trip the sensor by moving the magnet away from the
sensor and listen for the correct system response. If the
system does not respond, proceed to the Troubleshooting
section.
Troubleshooting
Use the following guidelines if the system does not respond
correctly when the sensor is activated.
• Check programming and re-program sensor into panel if
necessary.
• Use an RF Sniffer (NX-468) test tool to verify that the
sensor is transmitting. Constant beeps from the RF Sniffer
indicate a runaway (faulty) sensor. Replace the sensor.
• Change the position of or move the sensor to another
location and test for correct response.
To reposition a sensor:
1.
Rotate the sensor and test for improved sensor
communication at 90 and 180 degrees from the original
position.
2. If poor communication persists, relocate the sensor as
described below.
To relocate a sensor:
1.
Test the sensor a few inches from the original position.
2. Increase the distance from the original position and retest
until an acceptable location is found.
3. Mount the sensor in the new location.
4. If no location is acceptable, replace the sensor.
2 NX-450, NX
-451 Door/Window Sensors Installation Instructions