Bosch Security Systems 840LSN Users manual

DS840LSN

EN

Installation Guide

TriTech PIR/Microwave
Intrusion Detector

DS840LSN | Installation Guide | 1. General Information EN | 2

1. General Information

The DS840LSN is a microprocessor-based TriTech
Passive Infrared/Microwave Intrusion Detector.
Patented Passive Infrared and Microwave signal
processing provides excellent catch performance with
freedom from false alarms.

The DS840LSN can communicate and connect to all
LSN Bus Systems.

2. Specifications

Table 1: DS840LSN Specifications

Standby Power

LSN Supply Voltage
LSN Current

Consumption
Alarm Signal

Temperature

Microwave
Frequency

Coverage
Internal Pointability
Cover Tamper
Options

Patents

Compliance

DS840LSN 10.525 GHz (UL Listed)
DS840LSNC 10.588 GHz (UK, France)

Changes or modifications not expressly approved by
Bosch Security Systems can void the user's authority to
operate the equipment.

No internal standby battery. For each
hour of standby time needed, 4 mAh
are required. For UL Listed

Requirements, four hours (16 mAh)
are required.

33 V maximum

4.0 mA

Alarms are reported to the panel via
the LSN Bus.

-40°C to +49°C (-40°F to +120°F).

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

12 m x 12 m (40 ft. x 40 ft.)
+2° to –18° Vertical
Tamper signaling via LSN Bus
B335 Low Profile Swivel Mount

Bracket and B338 Ceiling Mount
Bracket. (The use of brackets may
reduce range and increase dead
zone areas.)

These detectors are covered under
one or more of the following U.S.
patents: #4,660,024, #4,764,755,
#5,077,548, #5,208,567,
#5,262,783, #5,450,062 and
#5,670,943.
Other patents pending.

This device complies with Part 15 of the
FCC Rules and with RSS-210 of Industry
and Science Canada. Operation is subject
to the following two conditions:

(1) This device may not cause harmful
interference, and

(2) This device must accept any interference
received, including interference that may
cause undesirable operation.

3. Mounting

3.1 Mounting Considerations

• Never install the detector in an environment that

causes a constant alarm in one technology; it
should never be left to operate with the LEDs in a
constant flashing green, yellow, or red condition. A
detector with one technology in constant alarm will
cause an alarm output whenever the other
technology alarms. Good installations start with the
LEDs OFF when there is no target motion.

• Point the unit away from outside traffic (for

example, roads, alleys, and parking lots).

Microwave energy will pass through glass
and most common non-metallic
construction walls.

• Avoid direct or indirect sunlight.

• Point the unit away from glass exposed to the

outdoors and objects that may change temperature
rapidly (see Figure 1)

The PIR detector will react to objects
rapidly changing temperature within its
field-of-view.

Figure 1: Avoid extreme temperature change

locations

• Eliminate interference from nearby outside

sources.

• Avoid installations where rotating machines (such

as ceiling fans) are normally in operation within
the coverage pattern (see Figure 2).

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DS840LSN | Installation Guide | 3. Mounting EN | 3

Figure 2: Avoid installing near rotating machines

• Select a location likely to intercept an intruder

moving across the coverage pattern (see Figure 3).

Figure 3: Coverage Pattern

Avoid mounting the detector in locations
(such as above a doorway) where people
can pass in close proximity (0.5 m / 1.5 ft.)
of the detector.

• The surface should be solid and vibration-free.

• Mounting height range is 1.8 m to 2.4 m (6 ft. to

8 ft.). The recommended height is 2.3 m (7.5 ft.).
Mounting height for Pet Applications is 2 m
(6.5 ft.).

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DS840LSN | Installation Guide | 3. Mounting EN | 4

3.2 Mounting the Detector

See Figure 4 for location of features.

1. Remove the cover by inserting a thin flathead

screwdriver into the locking tab hole at the bottom
front of the detector, pressing in, and pulling the
cover up and forward.

Mount the unit with the terminal block up.

2. Remove the circuit board from the base by pulling

outward slightly on one of the Circuit Board
Locking Tabs (7).

Do not touch the mirror surface.
If you have touched the mirror surface

accidentally, be sure to carefully clean wipe
off fingerprints with a clean cloth and a mild
non-abrasive cleaning solution.

Figure 4: Location of Features

3. Remove the Mirror Assembly (9).

Carefully press with two fingers on the top end of
the mirror assembly (9) and slide it out of the
spring loaded tracks (11).

4. Break away the needed Wire Knockouts for the

wire entrance (4).

5. Open two holes for surface or corner mounting

(13).

6. Mark the location for the mounting screws using

the enclosure as a template.

7. Pre-start the mounting screws.

8. Route wiring as necessary (see Section 4. Wiring).

Route to the rear of the base and through the wire
entrance. Make sure all wiring is unpowered

before routing.

9. Securely attach the base to the mounting surface.

10. Return the circuit board to the base.

11. Install the mirror using settings in Table 3.

1 2

11

3

6

8

13 13

4 4

5

13

1 - Inside view (circuit board and mirror assembly

mounted)

2 - Inside view (no circuit board and mirror assembly

mounted)
3 - Microwave Range Adjustment
4 - Wiring Knockouts
5 - Terminal Block (T-strip)
6 - LEDs (green, yellow, red)

14

13

77

8

9

10

11

7 - Circuit Board Locking Tab (One on each side)
8 - Tamper Switch
9 - Mirror Assembly
10 - Microwave Board
11 - Mirror Tracks (2)
12 - Bracket Mounting Hole
13 - Mounting Hole Knockouts
14 - Cable Tie Strain Relief

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DS840LSN | Installation Guide | 4. Wiring EN | 5

4. Wiring

Apply power ONLY after all connections
have been made and inspected. Do NOT
coil excess wiring inside the detector.

Figure 5: DS840LSN Terminals

1 2 3 4

1 - aLSN1 & bLSN1: coming from the preceding

LSN element. Shielded cable is recommended

for bus connections
2 - aLSN2 & bLSN2: going to the next LSN

element. Shielded cable is recommended for

bus connections.
3 - 5 & 6: Spare terminals.
4 - 7: Connection for ground wire from shielded

cable.

Do not coil excess wire inside the
enclosure.

Plug the wire entrance hole with the foam
plug provided after all wiring connections
have been made.

5. LED Operation

The detector uses 3 colored LEDs to indicate the
various alarm and supervision trouble conditions that
that exist. See Table 2.

Table 2: Status of LEDs

Walk
Test
Status Condition Red Yellow Green

Disabled All Off Off Off
Enabled

Power-Up Sequential Green, Yellow, Red

Flashing
Dual Alarm Flashing Off Off
Microwave

Alarm

PIR Alarm Off Off Flashing

No Activity Off Off Off

Off Flashing Off

During walk testing, the LEDs light for the first
technology (microwave or PIR) and then light red to
indicate a detector alarm. The LEDs will not indicate
activation of the second technology with color.

If the detector experiences a Microwave or PIR self-test
failure, it is in need of replacement.

6. Mirror Alignment

1. Select the vertical mirror angle from Table 3 to

match the mounting height and desired maximum
coverage.

Table 3: Broad Coverage Mirror

Maximum Coverage DistanceMounting

Height

2.0 m (6.5 ft.)

2.3 m (7.4 ft.)

2.6 m (8.5 ft.)

* = Required Settings for Pet Applications

2. The angle adjust markings are on the mirror. Push

in on the bottom or top of the mirror assembly to
position the angle hash marks with the markers on
each side of the frame (Figure 6) based on the
values in Table 3.

7.5 m (25 ft.) 12 m (40 ft.)

-6° * -4° *

-10° -8°

-12° -8°

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