Filter
Top Products
10 © 2012 Bosch Security Systems, Inc.
If the time period selected has elapsed from the last alarm, the LED will
fl ash two times and the Trouble Output will activate.
Setting the Motion Monitor timer to shorter periods can be used to force a
protection walk test of remotely located zones.
It is recommended that the 30 day timer be selected. This verifi es that the
unit is operational and avoids nuisance trouble conditions caused by holi-
days, vacations, etc.
NOTICE!
When attempting to remove any masking, many adhesives will either
destroy the mirror surface or leave enough residue behind to reduce
coverage performance.
AR8-13
AR8-13
D
432143125
A
B
P
C
E
F
G
H
I
J
N
O
K
L
M
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
TOP VIEW
M-
4
M-3 M-2 M-1 E-1 E-2 E-3
E-4
5
SIDE VIEW
Figure 7.1: Mirror module to pattern reference
7 Optical Module
7.1 Optical Module Masking
Peel-off masks are provided with the unit for each segment of the opti-
cal module to allow for customized coverage, or to block out areas of
objects that may cause thermal disturbances. The mask is self-adhesive
and pre-cut in the shape of the optical module.
The location of the zone to be masked depends on the position of the
detector. Therefore, determine the mirror surface to be masked before
removing the mirror from the detector.
To block out a particular zone or group of zones, peel off a section of
the mask that corresponds to the appropriate zone, and stick it on the
mirror segment. Before attempting any masking, be sure the chosen
mirror surface is the correct one. Refer to Figure 7.1 to identify mirror
segments and zones.
NOTICE!
When disabling the look-down segment, do not mask segment 5 direct-
ly as this will disable the entire detector. Instead, mask the segment on
the dome directly below segment 5.
F.01U.263.663 | 01 | 05.2012 | 3
1 Overview
The DS938Z is a high performance passive infrared intrusion detector. It is
equipped with advanced PIR detection and supervision circuits and is de-
signed to provide an alarm condition upon detection of an intruder passing
through its area of coverage.
Employing balanced dual-opposed sensing elements, the DS938Z passive
infrared (PIR) detector makes use of the fact that all objects give off (emit)
infrared energy, and that the warmer an object is, the greater the amount
of infrared energy given off. The DS938Z uses PIR receiver technology
designed to detect the change in infrared energy caused when a target of a
different temperature from a stable background passes through its fi eld of
coverage.
The coverage pattern consists of sensor zones arranged to form a circular
coverage pattern.
Using Motion Analyzer II circuitry, the detector must fi rst see a change in
infrared energy in one zone followed by a change of energy in the remain-
ing zone. Therefore, disturbances that occur in only one fi nger do not
constitute motion and are ignored. This “catch sensitivity” may be changed
in the fi eld by the installer to provide the degree of sensitivity required by
the installation.
Self-test and supervision circuits provide reliable operation in a variety of
installation environments. The result is a highly advanced detector offering
superior performance with freedom from false alarms.
Specifi cations
Dimensions
(HxDia)
3.5 in. x 5.25 in. (8.9 cm x 13.3 cm)
Input
Power
6.0 to 15.0 VDC; 5 mA standby, 20 mA in alarm with LEDs enabled. Use only an Approved
Limited Power Source.
Alarm Relay Silent-operating Form “C” relay. Contacts rated <100 mA, 25 VDC, 2.5W maximum, <20
Ohm closed for DC resistive loads.
Tamper Contacts rated at 28 VDC, 125 mA maximum, <1 Ohm. Connect tamper circuit to a 24-
hour protection circuit.
Trouble
Output
Maximum current load is 25 mA.
Optional
Accessory
TC6000 test cord.