Bosch Appliances Home Security System DS938Z User Manual

Ceiling Mount  
PIR Detector with Self-Test  
DS938Z  
en Installation Guide  
Reading Bosch Security Systems, Inc. Product Date Codes  
For Product Date Code information, refer to the Bosch Security Systems, Inc.  
© 2012 Bosch Security Systems, Inc. 130 Perinton Parkway Fairport, NY 14450  
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If the time period selected has elapsed from the last alarm, the LED will  
1 Overview  
ash two times and the Trouble Output will activate.  
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.  
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 veries that the  
unit is operational and avoids nuisance trouble conditions caused by holi-  
days, vacations, etc.  
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 eld of  
coverage.  
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.  
The coverage pattern consists of sensor zones arranged to form a circular  
coverage pattern.  
Using Motion Analyzer II circuitry, the detector must 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 nger do not  
constitute motion and are ignored. This “catch sensitivity” may be changed  
in the 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.  
Specications  
NOTICE!  
Dimensions 3.5 in. x 5.25 in. (8.9 cm x 13.3 cm)  
(HxDia)  
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.  
Input  
6.0 to 15.0 VDC; 5 mA standby, 20 mA in alarm with LEDs enabled. Use only an Approved  
Limited Power Source.  
Power  
Alarm Relay Silent-operating Form “C” relay. Contacts rated <100 mA, 25 VDC, 2.5W maximum, <20  
Ohm closed for DC resistive loads.  
TOP VIEW  
A
SIDE VIEW  
AR8-13  
Tamper  
Contacts rated at 28 VDC, 125 mA maximum, <1 Ohm. Connect tamper circuit to a 24-  
hour protection circuit.  
A
P
B
B
P
O
C
O
C
Trouble  
Output  
Maximum current load is 25 mA.  
D
N
N
D
E-4  
M-4  
M
E
M-3  
M-2  
M-1  
5
E-1  
E-2  
E-3  
Optional  
TC6000 test cord.  
M
E
Accessory  
L
F
G
L
K
F
J
H
A R 8 - 1 3  
I
K
G
J
H
I
1
2
3
4
5
4
3
2
1
Figure 7.1: Mirror module to pattern reference  
NOTICE!  
When attempting to remove any masking, many adhesives will either  
destroy the mirror surface or leave enough residue behind to reduce  
coverage performance.  
10 © 2012 Bosch Security Systems, Inc.  
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6.2 False Alarm Prevention  
2 Mounting  
Turn on all heating and cooling sources that would normally be in opera-  
tion during times of protection. Stand away from the unit and outside the  
coverage pattern, then monitor the background noise for at least three  
minutes.  
Select a location likely to intercept an intruder moving beneath and across  
the coverage pattern. Refer to Figure 2.1. Recommended mounting height  
range is 8 to 18 feet (2.4 to 5.5 m).  
The 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 sys-  
tems).  
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.  
30 ft  
26 ft  
30 ft  
26 ft  
20 ft  
13 ft  
7 ft  
0 ft  
7 ft  
13 ft  
20 ft  
9 m  
30 ft  
8 m  
6 m  
4 m  
2 m  
0 m  
2 m  
4 m  
6 m  
26 ft  
20 ft  
13 ft  
7 ft  
6.3 Coverage Margin  
Again walk across the farthest edge of required coverage.  
≤5.5 m  
4.6 m  
≥4.0 m  
≤18 ft  
15 ft  
≥13 ft  
AR13-18  
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.  
0 m  
0 ft  
0 ft  
≤4.0 m  
3.0 m  
≤13 ft  
10 ft  
7 ft  
AR8-13  
4 m  
≥2.4 m  
≥8 ft  
13 ft  
20 ft  
When testing is completed, remove the TC6000 Test Cord, and twist-lock  
the cover into place.  
0 m  
0 ft  
8 m  
6 m  
4 m  
2 m  
0 m  
2 m  
6 m  
8 m  
9 m  
9 m  
8 m  
9 m  
26 ft  
30 ft  
6.4 Supervision Feature  
Figure 2.1: Coverage Pattern  
The DS938Z performs several supervision features that, combined with  
the advanced motion detection capabilities of the detector, provide an ex-  
tremely high level of security. A supervision trouble condition is indicated  
at the detector by the Alarm/Test LED (see the Supervision Display Chart).  
1. Remove the base from the enclosure by pressing the two enclosure re-  
lease tabs inward while lifting the enclosure away from the base. Refer  
to Figure 2.2.  
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.  
Enclosure release tabs  
The supervision features function as follows:  
Test lead  
cutout  
Interface connector  
LED  
CAUSE  
Optical module  
ON  
Unit alarm  
Cover twist tabs (4)  
Enclosure release openings (2)  
2 Flashes  
4 Flashes  
Motion monitor time out  
PIR self-test failure  
Anti-vandal  
locking screw  
holes (2)  
PIR: The operation of the PIR is electronically checked approximately ev-  
ery 12 hours. If the PIR fails, the Alarm/Test LED will ash four times and  
the Trouble Output will activate.  
Interface  
pins  
Figure 2.2: Opening cover  
Motion Monitor Supervision: This feature veries 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 con-  
dition 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.  
NOTICE!  
Slightly rock the enclosure side-to-side during removal to overcome the  
friction caused by the base-to-enclosure terminal pins.  
2. Open the cover by turning counterclockwise.  
Refer to Section 4.0 Feature Selection for proper switch settings.  
3. Route wiring as necessary to the rear of the base and through the cen-  
ter hole. Refer to Figure 2.3.  
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NOTICE!  
CAUTION!  
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 connec-  
tor pins, the center pin is positive (+) with respect to either outside pin  
(outside pins are common (-)).  
Be sure all wiring is unpowered (de-energized) before routing.  
ANTI-T AMPER SCREW HOLE  
REQUIRED FOR EN50131  
INST ALLA TIONS  
Use of the sounder is intended only as an aid for walk testing during  
installation.  
ALARM/TEST LED  
INDICATOR (3)  
SOUNDER  
TEST LEAD  
CUTOUT  
NOISE  
VOLTAGE  
TERMINAL  
STRIP  
REAR WIRE  
ENTRANCE  
3. Place the cover on the unit, and twist-lock it clockwise into place.  
NOTICE!  
LO  
HI  
Be sure the TC6000 and Sonalert leads are dressed through the cut-  
out.  
WIRE  
TIE-DOWNS (2)  
MOUNTING  
SLOTS (4)  
INTERFACE  
PINS  
GAIN SELECT  
JUMPER  
COVER  
TAMPER  
4. Apply power to the unit.  
CONFIGURATION  
SWITCHES  
5. Wait at least two minutes, after applying power, to start walk tests.  
Mounting Base  
ANTI-TAMPER SCREW HOLE  
REQUIRED FOR EN50131  
INSTALLATIONS  
Top View of Enclosure  
with Cover and Optical Module Removed  
NOTICE!  
Walk testing should be done across the coverage pattern as shown.  
Figure 2.3: Overview  
4. 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 4-inch octagonal or square electrical  
boxes.  
6. The edge of the coverage pattern is determined when the Alarm/Test  
LED indicator (and optional Sonalert®, if installed) rst turns on.  
7. Walk test the unit from all directions to determine the boundaries.  
8. After completion of the walk tests, remove the Sonalert® (if installed).  
NOTICE!  
The DS938Z base will not completely cover a 4-inch square box. Where  
aesthetics are important, a 4-inch octagonal box is recommended.  
6 Final Tests  
6.1 Noise Measurement  
NOTICE!  
NOTICE!  
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 4-inch octagonal and square boxes make a suitable  
back plate (when used with bolts and wing nuts, as an example).  
Meter readings are very important in determining background distur-  
bance levels and catch margin sensitivity.  
1. 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.  
3 Wiring  
2. The base reference level for reading background noise or target volt-  
ages 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  
uctuates greatly.  
CAUTION!  
Only apply power after all connections have been made and inspected.  
Do not coil excess wiring inside detector. Use no smaller than #22  
AWG (0.8 mm) wire in the terminal strip.  
8 © 2012 Bosch Security Systems, Inc.  
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Standard Sensitivity: Tolerates environment extremes on this setting,  
but requires the largest amount of intruder motion to achieve an alarm.  
KEY GUIDE  
INTERFACE  
PINS  
Intermediate Sensitivity: The recommended setting for most instal-  
lations. 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 in Intermediate Sensitivity mode.  
1
2
3
4
5
6
7
8
+
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.  
6 to 15  
VDC  
Alarm  
RELAY  
TAMPER  
Figure 3.1: Wiring to terminals  
If both switches are in the OFF position, the unit will default to the inter-  
mediate setting.  
Terminals 1 (-) & 2 (+): Power contacts.  
Terminals 3 (NO), 4 (C), & 5 (NC): Alarm relay contacts. Use terminals 4  
& 5 for Normally Closed circuits. Do not use with capacitive or inductive  
loads.  
NOTICE!  
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).  
Terminals 6 (T) & 7 (T): Normally Closed tamper contacts.  
Terminal 8 (TR): Solid state Trouble output. Shorts to ground (-) when the  
detector is in a Trouble condition.  
4.3 Signal Gain  
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. Refer to Figure 2.3.  
4 Feature Selection  
The DS938Z has several features that are controlled using the conguration  
switches.  
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.  
4 ON and 5 OFF  
4 OFF and 5 ON  
4 OFF and 5 OFF = Disabled  
=
=
4 Day  
30 Day  
Motion  
Monitor  
Low Gain: Recommended for applications where the area to be cov-  
ered is 40 ft. (12.2 m) or less in diameter and for applications where  
High Gain may be too sensitive for environmental extremes.  
2 ON and 3 OFF = High  
2 OFF and 3 ON = Intermediate  
2 ON and 3 ON = Standard  
Sensitivity  
1 ON  
1 OFF  
=
=
ON  
OFF  
NOTICE!  
Setting the DS938Z for Low Gain reduces the coverage area to 40 ft.  
(12.2 m) in diameter.  
OPEN  
5 Setup and Walk Testing  
Figure 4.1: Selecting features  
1. 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.  
4.1 LED Operation  
ON:  
Allows the Alarm/Test LED to operate when activated by  
2. Attach a Sonalert to the sounder pins at this time if one will be used  
during walk testing.  
motion.  
OFF: The LED will not operate on alarm activation, but will  
indicate a supervision trouble condition.  
4.2 Sensitivity Selection  
Sensitivity modes depend on the type of coverage desired and the installa-  
tion environment.  
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