Bosch DS938Z User manual

Installation Instructions
DS938Z Ceiling Mount
Passive Infrared Intrusion Detector with Self-Test
Trademark names are used throughout this document. In most cases,
these designations are claimed as trademarks or registered trademarks in
one or more countries by their respective owners. Rather than placing a
trademark symbol in every occurrence of a trademark name, Bosch
Security Systems, Inc. (hereinafter referred to as Bosch) uses the
names only in an editorial fashion and to the benefit of the trademark
owner with no intention of infringing the trademark.
1.0 General Description
The DS938Z is a high performance passive infrared intrusion detector. It is
equipped with advanced PIR detection and supervision circuits and is
designed 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 field
of coverage.
The coverage pattern consists of sensor zones arranged to form a
circular coverage pattern.
Using Motion Analyzer II circuitry, the detector must first see a change in
infrared energy in one zone followed by a change of energy in the
remaining zone. Therefore, disturbances that occur in only one finger do
not constitute motion and are ignored. This “catch sensitivity” may be
changed in the field 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.
2.0CertifcationsandApprovals
3.0Specifications
•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.
NOTE: For UL Certificated installations, the coverage is 360° by 54 ft.
(16.5 m) when mounted from 10 to 13 ft. (3.1 to
4.0 m) using the AR8-13 Array and when mounted from
15 to 18 ft. (4.6 to 5.5 m) using the AR13-18 Array.
• Input Power: 6.0 to 15.0 VDC; 18 mA.
•Standby Power: There is no internal standby battery. Connect to
DC power sources capable of supplying standby power if
primary power fails. Eighteen mA-H required for each hour of
standby time needed. Four hours (72 mA-H minimum) are
required for UL Certificated installations.
•Alarm Relay: Silent operating Form “C” relay. Contacts rated
125 mA, 28 VDC maximum for DC resistive loads. Do not use
with capacitive or inductive loads.
•Tamper: Normally Closed (with cover in place) tamper switch.
Contacts rated at 28 VDC, 125 mA maximum.
•Trouble Output: A solid state open collector conducts to
terminal 1 (-) when the detector is in a trouble condition.
Maximum current load is 25 mA.
•Temperature: The storage and operating range is -20° to
+120°F (-29° to +50°C). For UL Certificated installations, the
range is +32° to +120°F (0° to +50°C).
•Sonalert Connector: Using a Sonalert type sounder (low
voltage) will provide an audible tone when the unit is in alarm.
Use of the sounder is intended only as an aid for walk testing
during installation.
Sonalert is a registered trademark of Mallory Sonalert Products, Inc.
•Optional Accessory: TC6000 Test Cord.
Mounting Base
REAR WIRE
ENTRANCE
WIRE
TIE-DOWNS (2)
TERMINAL
STRIP
INTERFACE
PINS
MOUNTING
SLOTS (4)
18
Top View of Enclosure
with Cover Removed
AR8-13
AR8-13
ALARM/TEST LED
INDICATOR (3)
SOUNDER
NOISE
VOLTAGE
CONFIGURATION
SWITCHES
COVER
TAMPER
MODULE TABS (2)
OPTICAL
MODULE
ON
OFF
TEST LEAD
CUTOUT
ANTI-TAMPER SCREW HOLE
RE UIRED FOR EN50131
INSTALLATIONS
ANTI-TAMPER SCREW HOLE
RE UIRED FOR EN50131
INSTALLATIONS
Region Certification
Europe CE 89/336/EEC,
EN55022: 1998 +A1:2000 +A2:2003,
EN50130-4: 1996 +A1: 1998 +A2: 2003,
EN61000-4-2: 1995 +A1:1998 +A2: 2001,
EN61000-4-3: 2002 +A1: 2003,
EN61000-4-4: 1995 +A1:2000 +A2: 2001,
EN61000-4-5: 1995 +A1: 2001,
EN61000-4-6: 1996 +A1:2001 +A2: 2001,
EN61000-4-11:1994 +A1: 2001,
EN60950-1: 2001 +A11: 2004
EN50131-1, Grade 2
EN50131-2-2, Grade2
Environmental Class II
Poland TECHOM 98/07 Klasy"C"
USA UL ANSR: Intrusion Detection Units (UL639)
Sweden INTYG 04-683

Page 2 © Bosch Security Systems, Inc. 2011 DS938Z Installation Guide
4.0Mounting
Select a location likely to intercept an intruder moving across the
coverage pattern (review patterns on page 2). The recommended
ounting height is 8 to 18 ft. (2.4 to 5.5 m).
0
10 10 20 20 30 Feet 30
0
10
15
AR13-18 SIDE VIEW (Cross Section of 2 Opposite Zones)
0
33 66 9 Meters 9
0
3
4.6
0
10 10 20 20 30 Feet 30
0
10
AR8-13 SIDE VIEW (Cross Section of 2 Opposite Zones)
0
33 66 9 Meters 9
0
3
0369 Meters 3 6 9
0
10
20
30
10
20
30
TOP VIEW
NOTE: The mounting surface should be solid and vibration free (e.g.,
drop tiles should be secured if the area above the tiles is used
as an air return for HVAC systems).
• Do not mount near air handling system outlets, or in areas of
extreme drafts.
• Remove the cover by turning it 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 the base-to-enclosure terminal
pins.
• Route wiring as necessary to the rear of the base and through
the center hole.
NOTE: Be sure all wiring is unpowered (de-energized) before routing.
• Firmly mount 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 or square electrical boxes.
NOTE: The DS938Z base will not completely cover a four inch
square box. Where aesthetics are important, a four inch
octagonal box is recommended.
HINT: Mounting to removable ceiling tiles is not recommended unless a
sandwich is made of the base, ceiling tile, and a back plate behind
the tile. Covers used for four inch octagonal and square boxes
make a suitable back plate (when used with bolts and wing nuts,
as an example).
5.0 Selecting the Optical Module (AR8-13 or AR13-18)
• Replace the enclosure onto the base.
• For ceilings between 8 and 13 ft. (2.4 and 4.0 m) from the floor,
use the optical module marked AR8-13. This marking can be
found next to the two optical module tabs.
For ceilings between 13 and 18 ft. (4.0 and 5.5 m) high, use the
optical module marked AR13-18.
To replace an optical module, push the optical module tabs
towards the center until the module snaps free of the circuit
board. Holding the new module by the tabs, snap the new
module into place.
Avoid fingerprints on the mirrored surfaces. Should the mirrored
surfaces become soiled or otherwise marked, they can be
cleaned using a soft, clean cloth and any commonly available,
mild window cleaner.
6.0 Wiring
CAUTION: ONLYAPPLYPOWERAFTERALLCONNECTIONS
HAVEBEENMADEANDINSPECTED.
NOTE: Do not coil excess wiring inside unit.
– +
RELAY
12345678
6 to 15
VDC Alarm
INTERFACE
PINS
KEY GUIDE
TAMPER
•Terminals 1 (-) & 2 (+): Power limits are 6 to 15 VDC. Use no
smaller than #22 AWG (0.8 mm) wire pair between the unit and
the power source.
•Terminals 3, 4, & 5: Alarm relay contacts rated 125 mA, 28 VDC
maximum for DC resistive loads. Use terminals 4 & 5 for
Normally Closed circuits. Do not use with capacitive or inductive
loads.
•Terminals 6 & 7: Normally Closed tamper contacts rated at
28 VDC, 125 mA.
•Terminal 8: Trouble Output.
7.0 Configuration Switch Settings
The DS938Z has several features that are controlled using the
configuration switches.
1 ON = LED ON
1 OFF = LED OFF
2 ON and 3 OFF = High
2 OFF and 3 ON = Intermediate
2 ON and 3 ON = Standard
4 ON and 5 OFF = 4 Day Motion Monitor
4 OFF and 5 ON = 30 Day Motion Monitor
4 OFF and 5 OFF = Motion Monitor Disabled
ON
OFF
O
N
1 2 3 4 5
7.1LEDOperation(S1)
•ON: Allows the Alarm/Test LED to operate when activated by
motion.
•OFF: The LED will not operate on alarm activation, but will
indicate a supervision trouble condition.
INTERFACE
PINS
ANTI-VANDAL
TIE-DOWN SCREW
HOLE (2)
ENCLOSURE RELEASE
OPENINGS (2) Base
COVER TWIST
TABS (4) Cover
INTERFACE
CONNECTOR
ENCLOSURE
RELEASE TABS
OPTICAL
MODULE
TEST LEAD CUTOUT
Enclosure

DS938Z Installation Guide © Bosch Security Systems, Inc. 2011 Page 3
7.2 Sensitivity Mode (S2 and S3)
Sensitivity modes depend on the type of coverage desired and the
installation environment.
•Standard Sensitivity: Tolerates environment extremes on this
setting, but requires the largest amount of intruder motion to
achieve an alarm.
•Intermediate Sensitivity: The recommended setting for most
installations. Use in locations where an intruder is expected to
cover only a small portion of the protected area. Tolerates
normal environments on this setting. The detector is shipped
inIntermediateSensitivity mode.
•High Sensitivity: The setting for fast response to intruder
signals. For use only in extremely quiet environments where
ceiling drafts, and thermal and illumination transients are not
anticipated.
If both switches are in the OFF position, the unit will default to the
Intermediate setting.
NOTE: Although the sensitivity modes provide different degrees of
tolerance to environmentally caused alarms, the installer should
assure peak background noise voltage readings do not exceed
±0.15 VDC. (See Section 8.0 Final Tests).
7.3 Motion Monitor (S4 and S5)
Set switches S4 and S5 for the desired Motion Monitor time (see
Section 9.0 Supervision Features). The detector is shipped with
the Motion Monitor feature disabled.
7.4SignalGain
The DS938Z 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 60 ft. (18.3 m) in diameter. The DS938Z is shipped in this
setting. If the gain select jumper is missing, the unit will default
to High Gain.
•Low Gain: Recommended for applications where the area to
be covered is 40 ft. (12.2 m) or less in diameter and for
applications where High Gain may be too sensitive for
environmental extremes.
NOTE: Setting the DS938Z for Low Gain reduces the coverage area to
40 ft. (12.2 m) in diameter.
8.0 Setup and Walk Testing
• Attach a TC6000 Test Cord to the Noise Voltage terminals.
Since the outside terminals are common, polarity is not
important and the black lead may be toward or away from the
optical module.
• Attach a Sonalert to the sounder pins at this time if one will be
used during walk testing.
NOTE: The use of a Sonalert type device (sounder) will provide an
audible tone during the time the unit is in alarm. Of the three
available connector pins, the center pin is positive (+) with
respect to either outside pin (outside pins are common (-)).
•Place the cover on the unit, and twist-lock it clockwise into
place.
NOTE: Be sure the TC6000 and Sonalert leads are dressed through the
cutout.
• Apply power to the unit.
•Wait at least two minutes, after applying power, to start walk
tests.
NOTE: Walk testing should be done across the coverage pattern as
shown.
• The edge of the coverage pattern is determined when the Alarm/
Test LED indicator (and optional Sonalert®, if installed) first turns
on.
• Walk test the unit from all directions to determine the
boundaries.
• After completion of the walk tests, remove the Sonalert®(if
installed).
9.0 Final Tests
9.1 Noise Measurement
NOTE: Meter readings are very important in determining background
disturbance levels and catch margin sensitivity.
• Connect a 20,000 ohm/volt (or greater) DC VOM to the Noise
Voltage connector using the TC6000 as shown. Set meter scale
for about 3.0 VDC.
• The base reference level for reading background noise or target
voltages is approximately 2.0 VDC. Installations in quiet
environments, therefore, will result in a steady meter reading
between 1.9 and 2.1 VDC. Look for areas and sources of thermal
disturbances if the meter fluctuates greatly.
9.2 False Alarm Prevention
• Turn on all heating and cooling sources that would normally be
in operation during times of protection. Stand away from the unit
and outside the coverage pattern, then monitor the background
noise for at least three minutes.
Readings should not deviate from the reference level more than
±0.15 VDC. For readings outside these limits; eliminate the
cause, rotate the unit slightly, or mask out the mirror segment(s)
looking down at the thermal disturbance.
9.3 Coverage Margin
• Again walk across the farthest edge of required coverage.
A minimum voltage change of 1.0 VDC from the reference level is
required in the wintertime when the background temperature is
cool. This will make up for summertime, when the background is
warmer. If testing the unit in the summertime, the minimum
recommended voltage change is 0.75 VDC.
• When testing is completed, remove the TC6000 Test Cord, and
twist-lock the cover into place.
10.0Supervision Features
The DS938Z performs several supervision features that, combined
with the advanced motion detection capabilities of the detector,
provide an extremely high level of security. A supervision trouble
condition is indicated at the detector by the Alarm/Test LED (see
the Supervision Display Chart).
• The LED indicates the cause of the supervision trouble using
coded pulses. The supervision trouble signal activates the
Trouble Output available at terminal 8, which should be
connected to a 24-hour zone.

© Bosch Security Systems, Inc. 2011
130 Perinton Parkway, Fairport, New York, USA 14450
www.boschsecurity.com
3/11
DS938Z Installation Guide
P/N: F01U089246-03 Page 4
The supervision features function as follows:
Supervision Display Chart
LED
ON
2 Flashes
4 Flashes
CAUSE
Unit Alarm
Motion Monitor Timeout
PIR Self-test Failure
•PIR: The operation of the PIR is electronically checked
approximately every 12 hours. If the PIR fails, the Alarm/Test
LED will flash four times and the Trouble Output will activate.
•Motion Monitor Supervision: This feature verifies that the
detector has a clear view of the detection area and has not been
blocked. When selected using switches S4 and S5, a
supervision timer is activated. A trouble condition will be
indicated if the detector has not alarmed at least once during
the selected time period (this feature can be disabled by placing
both switches in the Off position). The time period selected
should be long enough to allow adequate time for holiday
weekends.
Refer to Section 6.0 (Configuration Switch Settings) for proper
switch settings.
If the time period selected has elapsed from the last alarm, the
LED will flash 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
verifies that the unit is operational and avoids nuisance trouble
conditions caused by holidays, vacations, etc.
11.0 Other Information
11.1Anti-vandalTie-down
• After the cover has been installed and twisted into place, the
entire assembly can be secured together using the supplied
anti-vandal screws. There are two of them; one for each side
(see drawings on page 1 for the location of the screw holes).
11.2 Anti-tamper Screws for EN50131 Applications
• After the enclosure assembly has been installed to the mount-
ing base, the entire assembly can be secured together using
the supplied anti-tamper screws. The anti-tamper screws are
required for EN50131 applications. There are two of them; one
for each side (see drawings on page 1 for the location of the
screw holes).
11.3 Optical Module Masking
• Peel-off masks are provided with the unit for each segment of
the optical 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.
• 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. Use Section 13.0 (DS938Z
Mirror Module to Pattern Reference) to identify mirror segments
and zones.
11.4 Maintenance
• At least once a year, the range and coverage should be checked
according to Sections 7.0 and 8.0 (Setup and Walk Testing and
Final Tests).
• To ensure continued daily operation, the end user should be
instructed to daily walk through the far end of the coverage
pattern. This assures an alarm output prior to arming the
system.
11.5 Reading Bosch Security Systems, Inc. Product Date Codes
For Product Date Code Information. refer to the Bosch Security
Systems, Inc. Web site at: http://www.boschsecurity.com/
datecodes.
12.0 Typical Placements to Achieve Coverage
13.0 Optical Masking to Avoid Environmental Problems
321 123
4
5
BASEBOARD HEAT
AR8-13
4321 5 432 1
MASK 3
SECTORS
AR8-13
4321 5 432 1
MASK 15
SECTORS
WINDOW
1123
4
5
14.0 DS938Z Mirror Module to Pattern Reference
M-4
AR8-13
D
432143125
ABP C
E
F
G
H
I
J
N
O
K
L
M
AB
C
D
E
F
G
H
I
J
K
L
M
N
O
P
TOP VIEW
M-3 M-2 M-1 E-1 E-2 E-3
E-
4
5
SIDE VIEW
NOTE: 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. When
replacing the mirror, make sure it is facing the same direction as
before it was removed.
Before attempting any masking, be sure the chosen mirror
surface is the correct one. When attempting to remove any
masking, many adhesives will either destroy the mirror surface or
leave enough residue behind to reduce coverage performance.
When disabling the look-down segment, do not mask segment 5
directly as this will disable the entire detector. Instead, mask the
segment on the dome directly below segment 5.
Avoid soiling or leaving fingerprints on the mirror surfaces.
Should they become soiled or otherwise marked, they can be
cleaned using a soft, clean cloth and any commonly available mild
window cleaner.
Drawings are not to scale and are intended as
pattern identifiers only.