Bosch DS940, DS940T Installation Instructions Manual

DS940/DS940T

Passive Infrared Detector

Installation Instructions

1.0 Description

The DS940 is a high performance Passive Infrared (PIR) Motion Sensor which uses advanced signal processing to provide outstanding
catch performance and unsurpassed false alarm immunity. It is designed to detect movement in the interior of a structure by sensing the
Infrared energy emitted from the human body as it moves across the sensor’s field of view. When motion is detected the unit sends an alarm
signal to the control panel.

2.0 Specifications

• Input Power: 9-15 volts DC

• Current Draw: 17 mA @ 12 VDC (standby and maximum)

• Standby Power: No internal standby battery. For UL Listed Prod-

uct Installations, 4 hours (68 mAh) standby
power must be provided by the control unit or

by a Listed burglary power supply.

• Relay Form “A” Normally Closed (NC) contact set
rated for 125 mA@ 28 volts maximum DC, 18
volts maximum AC for resistive loads.

• Tamper: (DS940T only) Normally Closed (with cover on).
Contacts rated at 28 VDC, 125 mA max. Con­nect tamper circuit to a 24hr. protection circuit.

3.0 Installation

3.1 Remove the cover using a

small flat-blade screwdriver.

Bottom of Detector

3.2 Press the vertical adjust

tab toward the side of the

case and lift out the board.

• Temperature: -20° to +120°F (-29° to +49°C).

For UL Listed installations, the temperature
range is +32°F to +120°F (0°C to +49°C).

• Humidity: 0 - 85% non-condensing.

• Dimensions: 3 in. x 2.25 in. x 1.5 in. (HxWxD)
(7.6 cm x 5.7 cm x 3.8 cm)

• Options: B335 Swivel Mounting Bracket. Use of this
bracket may decrease the PIR range and in­crease dead zones.

• 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/

.

3.3 Select a mounting location.

Mount the sensor where an
intruder will most likely cross
through the coverage pattern.

LED

ON

3.3.

3.4 Avoid.

3.3.

Direct Hot or
Cold
Drafts

Air
Conditioning

Outlets

Insert screwdriver here or here

Windows

and

Uninsulated

Walls

Moving Objects

Heat
Sources

Direct Sunlight

Mounting
Outdoors

Pets

7.5-9ft

3.3.

3.5 Position the detector at the correct height.

3.3.

7.5 - 9 ft.

(2.25 - 2.7 m)

Mount the detector 7.5 - 9 feet

(2.25 - 2.7 meters) above the floor

3.6 Mount the unit, using the appropriate
mounting holes.

Thinwall knockouts

for wiring

Corner Mount

Note:To avoid possible

circuit board
damage, use
only the
mounting
hardware
provided in the
appropriate
punch-out
mounting holes.

Be sure the vertical adjust tab
aligns with the correct mounting
height.

7.5-9ft

LED

ON

3.8 Wire the Detector.3.7 Install the board into the case.

9-15
VDC

-

Alarm

Contacts

+

(DS940T

only)

Tamper

Contacts

Surface

Remove

Mount

Areas

if using the

B335 Bracket

Don't overtighten the mounting screws
Cover may not attach correctly

3.9 Select LED Operation

LED

ON

7.5-9ft

ON

ON

7.5-9ft

N

ormally Closed (NC) contacts

3.10 If look-down is desired, peel away the look-down
mask. Do not remove the clear plastic lens.

LED

ON

7.5-9ft

LED

ON

OFF

4.0 Walk test the detector. This test should
be performed at the time of installation and
annually thereafter .

This detector contains an environmental
stabilization circuit which requires
approximately 2 minutes after initial
power-up to warm up. During this time
the detector will not respond to any
movement.

Please wait 2 minutes after initial power-

up to perform any walk tests.

© 2011 Bosch Security Systems, Inc.
130 Perinton Parkway, Fairport, New York 14450
www.boschsecurity.com

5.0 Coverage Patterns

Meters

0

20

1

2

10

0

10

10

20

Feet

0

10

11

20

Peel away

the mask

Meters

0

10

7.5

0

0

Feet

Look
Down

Although generally not required, if

12

masking is desired, the lens diagram

6

67­77

56­66

45­55

2010

34­44

23­33

30

shows the appropriate areas to be

3

4

5

6

7

8

9

30

masked (see shaded area on the
DS940 lens diagram). Use an
opaque material (such as, electrical
tape) to mask the desired areas.

1 234567891011

0

12 22
23 33
34 44
45 55
56 66

67 77

DS940 Lens
(inside view)

40

6

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