Learn Mode DS926
Ceiling Mount PIR Sensor
Learn Mode DS926 Ceiling Mount PIR Sensor
Document Number: 46-724 Rev. B
August 1996
60-592
INSTALLATION
INSTRUCTIONS
About This Document
This document describes the operation, installation,
and testing of the Learn Mode DS926 Ceiling Mount
PIR Sensor.
Figure 2 . Top View of Coverage P attern
Tools Needed
Product Summary
The DS926 design is based on the thermodynamic
principle that all objects emit infrared energy; that is,
the warmer the object, the more infrared energy it
emits. By using two balanced sensing elements of
opposite polarity (dual elements), the unit detects
change in infrared energy that occurs when a target
passes through its coverage pattern.
The coverage pattern consists of 30 sensor fingers in a
360° circular pattern, grouped by opposite polarity
into pairs or zones for target detection (see Figure 1
and Figure 2).
ν
ν
ν
Small pocket screwdriver
Screws and anchors (included)
Magnet, for activating the walk-test mode (not
included)
Installation Guidelines
Use the following guidelines when installing the sensor:
ν Select a location that is most likely to detect an
intruder moving beneath and across the coverage
pattern.
ν Avoid locations where there is direct exposure to
sunlight, and direct hot and cold drafts such as
those from heating/air-conditioning vents.
ν Be sure the mounting surface is solid and vibration free.
Note:
ν
Figure 1. Side View-Cross Section of Two Z ones
Ceiling tiles (for suspended ceilings) must be
secured if the ceiling is used as an air return
for HVAC systems.
Mount the unit on ceilings that are 7-12 feet high
(see Figure 1 for mounting height vs. coverage).
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Learn Mode DS926 Ceiling Mount PIR Sensor
Mounting the Sensor
The sensor can be surface-mounted using the attached
base or flush-mounted to a round plastic gang box
without the attached base. This section describes both
mounting methods.
2)
3)
Turn the screwdriver and the cover will lift and
separate partially from the base. Finish removing
the cover with your hand and set it aside.
Locate the holding tabs that secure the circuit
board holder to the base (see Figure 5).
Surface Mounting
1)
Remove the sensor cover from the base by inserting a small pocket screwdriver into one of the
slots at the seam where the two parts are joined
(see Figure 3).
Figure 5. Holding Tab Locations
Figure 3. Slot Location
2)
3)
Turn the screwdriver and the cover will lift and
separate partially from the base. Finish removing
the cover with your hand and set it aside.
Place the sensor base at the ceiling mounting location and mark at least two mounting holes (see
Figure 4).
Figure 4. Mounting H ole L ocations
4)
5)
4)
Install the anchors at the mounting hole marks.
Place the sensor base on the ceiling so the mounting holes line up with the anchors, and install the
screws.
Figure 6. Separating the Sensor Base and th e
Circuit B oard Holder
5)
6)
Flush Mounting
1)
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Remove the sensor cover from the base by inserting a small pocket screwdriver into one of the
slots at the seam where the two parts are joined
(see Figure 3).
Holding the sensor with both hands, use your
thumbs to push two holding tabs outward, while
at the same time using your fingers on the back of
the sensor to push the circuit board holder toward
you (see Figure 6).
Turn the sensor around and repeat step 4. The
sensor base and the circuit board holder should
be separated.
Mount the circuit board holder to a round plastic
gang box.
WARNING: Do not flush mount the sensor to metal gang
boxes; otherwise, the sensor’s transmitting
range is greatly reduced.
Learn Mode DS926 Ceiling Mount PIR Sensor
Setting the Sensitivity
This section describes how to set the sensor sensitivity
based on the noise conditions of the sensor location.
1)
Locate the sensitivity pins (see Figure 7).
1)
2)
3)
4)
Activate the walk-test mode by placing a magnet
next to the walk-test reed switch (see Figure 7).
The red walk test LED lights indicating the 75-second walk-test timer is activated.
Attach the sensor cover to the sensor.
Determine the edge boundaries of the protection
pattern by walk testing from all directions. Each
time the unit is tripped, the LED lights and the
timer resets, starting a new 75-second test period.
If necessary, the pattern can be adjusted ±15° by
rotating the lens with a small pocket screwdriver
inserted in the lens notch (see Figure 8).
Figure 7 . Sensor Component Locations
2)
Select a sensitivity setting by placing the shorting
cap on the appropriate pins, as described in Table
1.
Figure 8 . Len s Notch Location
Programming
Table 1. Sensitivity Settings
Sensitivity
Setting
Application
Standard
Used (and recommended) for normal installations. Setting tolerates
environmental extremes.
Intermediate
Used for locations where intruders cross only a small portion of
the protected area. Setting tolerates normal environmental disturbances.
High
Used only for extremely quiet and
stable environments for fast sensor response.
The following steps describe the general guidelines for
programming (learning) the sensor into panel memory.
Refer to the specific panel installation instructions or
reference manual for complete programming details.
1) Set the panel to the program mode.
2) Proceed to the LEARN SENSORS menu.
3) Select the appropriate sensor group and sensor
number assignments.
4) When prompted by the panel to trip the sensor,
activate the sensor tamper switch by removing the
sensor cover.
5) Exit program mode.
Testing
The following steps describe the general guidelines for
testing the sensor. Refer to the specific panel installation instructions or reference manual for complete testing details.
Walk Testing the Sensor
1)
2)
This section describes how to walk test the sensor to
determine the coverage area.
3)
Set the panel to the dealer sensor test mode.
Trip the sensor by walking across the coverage
pattern.
Listen for interior siren beeps to indicate how
many rounds the panel receives from the sensor.
You should hear 6 to 8 beeps.
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Learn Mode DS926 Ceiling Mount PIR Sensor
Note:
To help extend battery life, the sensor has a
lock-out timer that prevents it from transmitting
more than once within a 3-minute period.
Specifications
If there is no response from the sensor during
a sensor test, clear the area for at least three
minutes, then trip the sensor by walking
across the coverage pattern.
Compatibility: All Learn Mode panels
Replacing the Sensor Battery
Power Source: One - 3.6 VDC Saft 1/2 AA Lithium
Battery
Operating Temperature: 32°F - 120°F
Dimensions: 4.58” (diameter) x 1.0” (depth)
Notices
This section describes how to change the sensor battery.
1)
2)
3)
Remove the sensor cover from the base by inserting a small pocket screwdriver into one of the
slots at the seam where the two parts are joined
(see Figure 3).
Remove the existing battery from the battery
holder, noting the battery’s positive (+) end.
Install the new battery with the positive end in
the same position as the old battery.
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions:
1) This device may not cause harmful interference.
2) This device must accept any interference received, including interference that may
cause undesired operation.
Changes or modifications not expressly approved by Interactive Technologies, Inc. can
void the users’ authority to operate the equipment.
WARNING: Install only the same size and type battery.
Do not substitute a different size or type battery.
4)
Test the sensor as described in the section “Testing.”
Lithium Battery Disposal
Lithium batteries that are no longer usable are considered hazardous waste. Contact your local city government for hazardous waste disposal laws.
ITI is a registered trademark of Interactive Technologies, Inc.
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