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 holi- days, vacations, etc.
7 Optical Module
7.1 Optical Module Masking
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
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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.
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
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 remain- ing 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.
Specifications
Dimensions | 3.5 in. x 5.25 in. (8.9 cm x 13.3 cm) |
(HxDia) |
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Input | 6.0 to 15.0 VDC; 5 mA standby, 20 mA in alarm with LEDs enabled. Use only an Approved |
Power | Limited Power Source. |
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Alarm Relay | |
| Ohm closed for DC resistive loads. |
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Tamper | Contacts rated at 28 VDC, 125 mA maximum, <1 Ohm. Connect tamper circuit to a 24- |
| hour protection circuit. |
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Trouble | Maximum current load is 25 mA. |
Output |
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Optional | TC6000 test cord. |
Accessory |
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10 © 2012 Bosch Security Systems, Inc. | F.01U.263.663 01 05.2012 3 |