Bosch MX938I Specsheet
Intrusion Alarm Systems | MX938i Multiplex Intrusion Detector
MX938i Multiplex Intrusion Detector
www.boschsecurity.com
u Interchangeable optical modules
u Selectable sensitivity
u Selectable signal gain
The MX938i is a ceiling-mount PIR intrusion detector
that provides a 360° coverage pattern consisting of 64
zones grouped into 16 barriers, with one additional
zone looking straight down from the unit (sabotage).
Through the use of interchangeable optical modules,
the detector can be mounted on ceilings from 2.4 m
(8 ft) to 5.5 m (18 ft) high.
It is designed to connect to the multiplex bus of a
control panel and optionally to an auxiliary 12 VDC
power source. It is compatible with DS7400Xi Series
Control Panels with a DS7430 or DS7436 Multiplex
Expansion Module or with GV2 and G Series Control
Panels with a D8125MUX Module installed.
Notice
The DS7400Xi Series Control Panels require ROM
version 1.07 or greater.
Functions
Interchangeable, Pointable Mirrors
The detector comes with two optical modules:
• AR8-13: For ceilings between 2.4 m (8 ft) and 4.0 m
(13 ft) high
• AR13-18: For ceilings between 4.0 m (13 ft) and 5.5 m
(18 ft) high
u Internal tamper switch
Selectable Sensitivity
• Standard: Recommended setting for maximum false
alarm immunity. Tolerates environment extremes on
this setting. Not recommended for Long Range or
Barrier type patterns. The detector is shipped in
Standard Sensitivity mode.
• Intermediate: Recommended setting for any location
where an intruder is expected to cover only a small
portion of the protected area. Tolerates normal
environments on this setting. This setting will improve
your intruder catch performance.
• High: Fast response to intruder signals. For use in
quiet environments where thermal and illumination
transients are not anticipated.
Signal Gain
The MX938i permits selection of the signal gain
depending upon the environment to be protected. The
gain select jumper is located under the optical
module.
• High Gain: Recommended for large coverage
applications up to 18.3 m (60 ft) in diameter. The
MX938i is shipped in this setting. If the gain jumper is
missing, it will default to high gain.
• Low Gain: Recommended for applications where the
area to be covered is 12.2 m (40 ft) or less in
diameter and for applications where the HIGH signal
gain setting may be too sensitive for environmental
extremes.
0 m
9 m
9 m
0 ft
30 ft
30 ft
30 ft
0 ft
10 ft
9 m
0 m
3 m
30 ft
9 m
0 ft
0 m
0 ft
30 ft
30 ft
0 ft
10 ft
15 ft
0 m
9 m
9 m
0 m
3 m
4.5 m
2 | MX938i Multiplex Intrusion Detector
Notice
Setting the MX938i for the LOW signal gain setting
reduces the coverage area to 12.2 m (40 ft) in
diameter.
Internal Tamper Switch
The internal tamper switch sends a signal to the
panel's multiplex bus for display at the keypads when
the detector's cover is removed.
Certifications and approvals
Europe
Region Certification
USA UL ANSR: Intrusion Detection Units
(UL639)
China CCC MX938i: 2002031901000002
Installation/configuration notes
AR13-18 Side View - This view shows a cross section of
two opposite zones.
Coverage Information
The recommended mounting height range is 2.4 m
(8 ft) to 5.5 m (18 ft). The pattern consists of 64 zones
grouped into 16 barriers, with one additional zone
looking straight down from the unit (sabotage). Each
barrier is 9.2 m (30 ft) long and 1.3 m (4.4 ft) wide at
9.2 m (30 ft).
There is a choice of two optical modules depending on
ceiling height. These choices provide 360° by 18.3 m
(60 ft) diameter coverage when mounted on 2.4 m
(8 ft) to 5.5 m (18 ft) high ceilings.
Wiring Considerations
Do not use shielded cable. Use wire that is no smaller
than 0.8 mm (22 AWG) to connect the detector to the
control panel.
Top View
360° x 18.3 m (60 ft) Diameter
AR8-13 Side View - This view shows a cross section of
two opposite zones.
Technical specifications
Environmental Considerations
Temperature
(Operating):
-29°C to +49°C (-20°F to +120°F). For UL Listed
Requirements, the temperature range is 0°C to
+49°C (+32°F to +120°F).
Power Requirements
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 is required.
Voltage (Input): 12 VDC from panel's MUX bus and
optionally from an auxiliary power supply.
Current Draw (two-wire):
LED Off: < 350 µA draw on MUX bus
In Alarm; LED On: 2 mA draw on MUX bus
Current Draw (four-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
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