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Installation Instructions
for the MX938i
Ceiling Mount Multiplex
PIR Intrusion Detector
1.0 Specifications
• Input Power: Connects directly to the Multiplex Bus of the
Control Panel and optionally to an auxiliary
12 VDC source.
• Current Draw:
2-Wire:
LED Off: < 350 µA draw on Mux Bus.
In Alarm; LED On: 2 mA draw on Mux Bus.
4-Wire:
LED Off: < 350 µA draw on Mux Bus.;
0 mA draw on Aux. power.
In Alarm; LED On: < 350 µA draw on Mux Bus;
3 mA draw on Aux. power.
• Standby Power: There is no internal standby battery. Connect
to DC power sources capable of supplying
standby power if primary power fails. For each
hour of standby time needed, 350 µAh are
required.
For UL Listed Requirements, four
hours (1400 µAh) minimum are required.
• Coverage: 360° by 60 ft. (18.3 m) diameter coverage
when mounted on 8 to 18 ft. (2.4 to 5.5 m)
high ceilings. Pattern consists of 64 zones
grouped into 16 barriers, with one additional
zone looking straight down from the unit
(sabotage). Each barrier is 30 ft. (9.2 m) long
and 4.4 ft. (1.3 m) wide at 30 ft. (9.2 m).
Choice of two optical modules depending
on ceiling height.
For UL Listed
Requirements, the coverage is 360° by 54 ft.
(16.5 m) when mounted 10 to 13 ft. (3.1 m to
4.0 m) using the AR8-13 array and when
mounted from 15 to 18 ft. (4.6 m to 5.5 m)
using the AR13-18 array.
• Sensitivity: Selectable for Standard, Intermediate or High.
• Tamper: A tamper condition is signaled through the
Multiplex Bus and displays at the system
keypads.
• Temperature: The storage and operating temperature
range is -20°F to +120°F (-29°C to +49°C).
For UL Listed Requirements, the
temperature range is +32°F to +120°F (0°C
to 49°C).
• Control Panel
Requirements: DS7400, DS7400X, or DS7400Xi Control
Panel with a DS7430 or DS7436 Multiplex
Expansion Module. DS7400 and DS7400X
require ROM version 1.07 or greater. The
9000 Series Control/Communicators with
D8125MUX Module installed.
• Patents: This device is covered under one or more of
the following U.S. patents: #4,764,755,
#5,268,668, and #5,302,941.
2.0 Control Panel Programming
Refer to the multiplex programming section of your Control Panel
Reference Guide for information on programming multiplex zones
for this device.
3.0 Mounting
Avoid
Direct or
reflected
sunlight
Moisture
Moving objects
Hot or cold air
directed onto
sensor
Mounting Outdoors
Pets or animals
Rear Wire
Entrance
Te rm ina l
Strip
Interface
Pins
Mounting
Slots (4)
Wire
Tie-Downs (2)
Mounting Base
Walk Test/Alarm
LED Indicator (3)
Sensitivity
Jumper
Cover
Ta mp er
Te rm in al
Strip
Signal
Gain
Jumper
LED
Operation
Jumper
Top View of Enclosure
with Cover Removed
Module Tabs (2)
AR8-13
Address
Switches
Optical Module
with Cutaway to
show Circuit
Board detail
IMPORTANT
The mounting surface should be solid and vibration free
(i.e., drop tiles should be secured if the area above the
tiles is used as an air return for HVAC systems).
• Select a location that is most likely to intercept an intruder moving
across the coverage pattern. The recommended mounting height
range is 8 to 18 ft. (2.4 to 5.5 m).
• Remove the cover by turning counterclockwise.
• Remove the base from the enclosure by pressing the two
enclosure release tabs inward while lifting the enclosure away
from the base.
Hint: Slightly rock the enclosure side-to-side during removal,
to overcome the friction caused by base-to-enclosure
terminal pins.
• Route wiring as necessary to the rear of the base and through
the center hole.
Be sure all wiring is unpowered (de-energized) before
routing.
• Securely attach the base. Depending on local regulations, the
base may be directly surface mounted using anchors, mollies
or wing-nuts, or may be mounted to standard four-inch octagonal
and square electrical boxes.
NOTE: The MX938i base will not completely cover a four-inch
square box. Where aesthetics are important, a four-inch
octagonal box is recommended.