Bosch DS240 User Manual download pdf

Installation Instructions

DS240 and DS241

Long Range Beam Smoke Detectors

1.0 Description

The DS240 and DS241 are long range projected beam type smoke

detectors which consist of a separate transmitter and receiver. Internal

pointability provides coverage flexibility without the need for brackets.

Automatic Signal Synchronization and Range Adjustment reduce

installation costs. Selectable sensitivity and alarm response time

provide installation flexibility.

2.0 Specifications

• Operating Voltage: DS240: 18.0 VDC to 32.0 VDC

DS241: 10.2 VDC to 15.0 VDC

• Standby Current: DS240: Receiver: 45 mA @ 24.0 VDC

Transmitter: 20 mA @ 24.0 VDC

DS241: Receiver: 50 mA @ 12.0 VDC

Transmitter: 20 mA @ 12.0 VDC

• Receiver Alarm

Current: DS240: 60 mA @ 24.0 VDC

DS241: 75 mA @ 12.0 VDC

• Range (distance

between transmitter

and receiver): 30 ft to 350 ft (9 m to 107 m)

• Spacing (distance

between systems): Allow no more than 60 ft (18 m) between

systems. Sixty foot spacing is confirmed

by Underwriters Laboratories, Inc. testing.

• Pointability: Internally pointable optics for ±90°

horizontal, and ±10° vertical adjustment.

• Sensitivity: Field selectable for 20, 30, 40, 50, 60, or

70 percent beam obscuration.

• Alarm Contacts: Normally Open contacts rated 1 A,

60 VDC maximum for DC resistive loads.

Do not use with capacitive or inductive

loads.

• Trouble Contacts: Normally Closed contacts rated 1 A, 60 VDC

maximum for DC resistive loads. Do not

use with capacitive or inductive loads.

• Aux. Alarm

Contacts: Form "C" (NO, C, NC) contacts rated 1 A,

60 VDC maximum for DC resistive loads.

Do not use with capacitive or inductive

loads.

• Tamper: Receiver: Access door tamper switch in

series with trouble contacts.

Transmitter: Upon cover’s removal, cover

tamper switch interrupts

transmission.

• System Signaling: Conventional 4-wire system. Not for use

with systems that incorporate an alarm

verification feature.

• Signal Delay: Fire: Selectable 30 sec or 5 sec

Trouble: 20 ± 2 sec

• Temperature: The storage and operating temperature

range is -22°F to +130°F (-30°C to +54°C).

For UL Listed installations, the range is

+32°F to +130°F (0°C to +54°C).

• Mounting: The units are designed to be mounted to

4 in. (10 cm) square or octagonal

electrical boxes (not supplied).

• Listings and

Approvals: UL S3019

ULC CS692

MSFM Permit #1943

NY City MEA Acceptance #MEA274-93-E

CSFM #7260-1062:106

FM Job #OX2A9.AY



• Standard

Accessories: DIS2000 Remote Test/Indicator Plate and

Test Cable

• Options: DIS240 Remote Indicator Plate, TK240

Field Test Kit, AL240 Alignment Light, and

TC2000 Test Cord.

3.0 Principle of Operation

Each DS240 or DS241 beam smoke detector has a separate

transmitter and receiver. The transmitter transmits an invisible infrared

beam of a specific frequency and intensity. The receiver detects, then

measures the beam’s intensity (see

Figure 1

Figure 1 - Infrared Transmission

As the beam is obscured by smoke, the receiver senses a decrease

in the signal strength and measures that decrease. The receiver

compares the signal level with two preset thresholds: an alarm

threshold which is set using the sensitivity switch and a trouble

threshold which is preset at approximately 10%. If the signal falls

below the alarm threshold for the programmed alarm period, the

receiver signals an alarm (see

Figure 2

Figure 2 - Beam Obscuration

If the signal falls below the trouble threshold for more than 20 sec,

such as might happen if the beam is blocked by a foreign object, the

receiver signals a trouble condition (see

Figure 3

Figure 3 - Beam Blockage

The receiver automatically compensates for the gradual loss of signal

due to dust/dirt build-up on the cover. After 50 percent of the signal is

lost, the receiver will indicate a trouble. When the dust/dirt build-up is

cleaned or the blockage is removed, the detector automatically goes

back to its normal operation level.

A trouble will be indicated at the receiver if the beam strength is

increased by more than 20% for greater than 20 sec. Causes include

improper initial alignment or the removal of a partial beam blockage

at the time of alignment. Preform a fine-tune alignment (see

Section

7.3 Fine Tune Alignment

on page 6).

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Summary of Contents

Page 1 - 3.0 Principle of Operation

Installation InstructionsDS240 and DS241Long Range Beam Smoke Detectors1.0 DescriptionThe DS240 and DS241 are long range projected beam type smokedete

Page 2

Page 3 - 5.0 Mounting

Page 4 - Figure 8

Page 5 - Figure 9

Page 6 - 8.0 Other Information

Page 7 - Figure 19

Page 8

Page 9 - 9.0 Troubleshooting

Page 10

Page 11

Related models: DS241

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Bosch DS240 User Manual

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Summary of Contents

Related models: DS241

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