Interlogix NX-450, NX-451 Specsheet

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NX-450, NX-451 Door/Window Sensors
Installation Instructions

Product summary

The NX-450 (white) and NX-451 (brown) Door/Window
Sensors (60-670-95R) can be installed on doors, windows, or
many other objects that open and close. The sensors transmit
signals to the control panel when a magnet mounted near the
sensor is moved away from or closer to the sensor.

The sensors include an input that accepts external hardwired
devices such as flush-mounted door/window contacts

Figure 1: NX-450, NX-451 Door/Window Sensor

Installation

• Avoid mounting sensors in areas where they will be
exposed to moisture or where the operating temperature
(10°-120°F) will be exceeded.

• Use spacers (not included) to keep sensors and magnets
away from metal or metallic surfaces such as foil
wallpaper.

Figure 2: Sensor and magnet locations

Sensor

Magnet

Installation guidelines

• Mount the sensor on the door frame and the magnet on
the door (see Figure 2 below). If the sensor is to be used
on do

uble doors, mount the sensor on the least-used door

and the magnet on the other door.

• If possible, locate sensors within 100 ft. of the panel. While
a transmitter may have a range of 500 ft. or more out in
the open, the environment at the installation site can have
a significant effect on transmitter range. Sometimes a
change in sensor location can help overcome adverse
wireless conditions.

• Make sure the alignment arrow on the magnet points to
the alignment mark on the sensor (see Figure 3 below).

•

Place sensors at least 5 inches above the floor to avoid

damaging them.

P/N 466-13

03-CDX • REV C • January 2011 1

Figure 3: Sensor and magnet alignment

Doorframe

2 - AAA Batteries

Materials needed

• #6 flathead screws

• Screwdriver or brad driver

Align Arro
and Mark

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.

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.

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.

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