Siemens OOH740-A9-Ex User manual

A6V10367521_h_en_--
Building Technologies
2015-02-02 Control Products and Systems
OOH740-A9-Ex
Automatic fire detector
Technical Manual

Legal notice
2
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Legal notice
Technical specifications and availability subject to change without notice.
© Siemens Switzerland Ltd, 2012
Transmittal, reproduction, dissemination and/or editing of this document as well as
utilization of its contents and communication thereof to others without express
authorization are prohibited. Offenders will be held liable for payment of damages.
All rights created by patent grant or registration of a utility model or design patent
are reserved.
Issued by:
Siemens Switzerland Ltd.
Building Technologies Division
International Headquarters
Gubelstrasse 22
CH-6301 Zug
Tel. [phone]
www.siemens.com/buildingtechnologies
Edition: 2015-02-02
Document ID: A6V10367521_h_en_--

3
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Table of contents
1About this document......................................................................................7
1.1 Applicable documents.....................................................................................11
1.2 Download center.............................................................................................11
1.3 Technical terms, abbreviations, and formula symbols......................................12
1.4 Revision history..............................................................................................13
2Safety............................................................................................................14
2.1 Safety instructions..........................................................................................14
2.2 Safety regulations for the method of operation................................................15
2.3 Standards and directives complied with ..........................................................18
2.4 Release Notes................................................................................................18
3Structure and function .................................................................................19
3.1 Setup..............................................................................................................19
3.1.1 Point detector OOH740-A9-Ex with ASAtechnology.........................19
3.1.2 Features of fire detection functionality..............................................21
3.1.3 Features of the 'Technical Ambient Supervision Message'................22
3.1.4 Details for ordering...........................................................................23
3.1.5 Reference to technical manual.........................................................23
3.1.6 Product version ES..........................................................................23
3.2 Function.........................................................................................................24
3.2.1 Parameter sets................................................................................24
3.2.2 Danger levels...................................................................................25
3.2.3 Diagnosis levels...............................................................................25
3.2.4 Automatic recognition of the detector line protocol............................25
3.2.5 Internal alarm indicator.....................................................................26
3.2.6 Connection for external alarm indicators...........................................26
3.2.7 Renovation mode.............................................................................26
3.2.8 Test mode .......................................................................................27
3.2.9 Behavior in degraded mode.............................................................27
3.2.10 Line tester........................................................................................27

4
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
3.3 Accessories....................................................................................................28
3.3.1 Addressable detector base FDB221.................................................28
3.3.2 Collective detector base FDB201.....................................................28
3.3.3 Flat, addressable detector base FDB222 .........................................28
3.3.4 Flat, collective detector base FDB222..............................................29
3.3.5 Base attachment FDB291................................................................29
3.3.6 Base attachment wet FDB295..........................................................29
3.3.7 Sealing element FDBZ295...............................................................30
3.3.8 Designation plate FDBZ291.............................................................30
3.3.9 Designation plate DBZ1193A...........................................................30
3.3.10 Detector locking device FDBZ293....................................................30
3.3.11 Dummy detector FDX291.................................................................31
3.3.12 Detector dust cap FDZ291...............................................................31
3.3.13 Connection terminal DBZ1190-AB ...................................................31
3.3.14 M20 x 1.5 metal cable gland............................................................31
3.3.15 Line adapter (Ex) FDCL221-Ex........................................................32
4Planning........................................................................................................33
4.1 Compatibility...................................................................................................33
4.2 Ambient features............................................................................................33
4.3 Parameter sets for addressed operation .........................................................35
4.3.1 Sensor mode 0 – Multisensor fire detector.......................................35
4.3.1.1 Description ......................................................................................35
4.3.1.2 Use..................................................................................................36
4.3.1.3 Specification....................................................................................37
4.3.2 Sensor mode 1 – Heat detector........................................................38
4.3.2.1 Description ......................................................................................38
4.3.2.2 Specification....................................................................................39
4.3.3 Sensor mode 2 – Smoke detector....................................................40
4.3.3.1 Description ......................................................................................40
4.3.3.2 Specification....................................................................................40
4.4 Parameter sets for collective operation...........................................................41
4.4.1 Replacing existing AlgoRex point detectors......................................41
4.5 Default settings...............................................................................................42
4.6 Technical Ambient Supervision Message........................................................42
4.6.1 Ambient conditions ..........................................................................43
4.6.1.1 Temperature monitoring...................................................................44
4.6.2 Configuration...................................................................................44
4.6.3 Default settings for the 'Technical Ambient Supervision
Message'.........................................................................................44

5
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
5Mounting/Installation....................................................................................45
5.1 Required space ..............................................................................................46
5.2 Collective and addressable detector base FDB201/221 ..................................47
5.3 Flat detector base FDB202/222 ......................................................................48
5.4 Base attachment FDB291...............................................................................49
5.5 Sealing element FDBZ295..............................................................................50
5.6 Detector locking device FDBZ293...................................................................51
5.7 Designation plate FDBZ291............................................................................52
5.8 Designation plate DBZ1193A..........................................................................52
5.9 Detector dust cap FDZ291..............................................................................53
5.10 Connecting the detector base.........................................................................54
5.10.1 Connection terminal DBZ1190-AB....................................................55
5.10.2 Connection diagram (C-NET-Ex)......................................................56
5.10.3 Connection diagram (collective).......................................................57
6Commissioning.............................................................................................59
7Maintenance / Repair....................................................................................60
7.1 Performance check.........................................................................................60
7.1.1 'Technical Ambient Supervision Message' performance check .........60
7.2 Testing detectors............................................................................................61
8Specifications...............................................................................................62
8.1 Technical data for OOH740-A9-Ex..................................................................62
8.1.1 General (irrespective of the detector line).........................................62
8.1.2 Detector lines...................................................................................63
8.2 Dimensions ....................................................................................................66
8.3 Environmental compatibility and disposal........................................................66
9Annex............................................................................................................67
Glossary.......................................................................................................................68
Index .......................................................................................................................69

6
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02

About this document 1
Applicable documents
7
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
1About this document
Retention and availability
NOTICE
Missing information
Damage due to misuse
●This document must be available in a usable format throughout the entire life
cycle of the product. Keep the document for reference and ensure that it can
be accessed by target groups.
Should you require another copy of this document, please contact the Customer
Support Center, phone [phone].
Goal and purpose
This document contains all the information relating to the automatic fire detector
OOH740-A9-Ex. Following the instructions consistently will ensure that the product
can be used safely and without any problems.
This document is aimed at users who are planning, installing, commissioning,
operating, and maintaining a fire detection installation FS720 or SIGMASYS with a
line card (FDnet/C-NET) with addressed detector lines within the scope of Directive
94/9/EC (ATEX directive) or IECEx.
General knowledge about the structure and function of fire detection installations
FS720 is required in order to understand the information.
The use of peripheral devices on collective detector lines in potentially explosive
atmospheres is described in document 001204.
See chapter 'Applicable documents'.
WARNING
Document A6V10324618 is an integral part of this document.
You must observe
the information in both this document and document A6V10324618!
Before installing the device, you must make yourself familiar with the content of
document A6V10324618 'Planning, Mounting/Installation, Commissioning,
Maintenance of fire detection installations with addressed detector lines in
potentially explosive atmospheres'. You can download the current version of the
document from the Internet, at the address http://siemens.com/bt/download.

1About this document
Applicable documents
8
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Device labeling
Device type OOH740-A9-Ex
Manufacturer Siemens Switzerland Ltd.
Infrastructure & Cities Sector
Building Technologies Division
International Headquarters
Gubelstrasse 22
CH-6301 Zug
Tel. [phone]
www.siemens.com/buildingtechnologies
Year of construction 2014 or later
IECEx scheme Ex ia IIC T4 Ga, Ta = -35…70 °C
Directive 94/9/EC
(ATEX Directive) II 1 G Ex ia IIC T4 Ga, Ta = -35…70 °C
When used in atmospheres at risk of gas explosion:
The automatic fire detector OOH740-A9-Ex must be protected against electrostatic
charging, along with all its accessory parts.
Intended use
The automatic fire detector OOH740-A9-Ex may only be used as follows:
lOn an C-NET-Ex detector line in a fire detection installation FS720 or in
collective mode.
lOn the detector line the automatic fire detector OOH740-A9-Ex must be
installed downstream of a line adapter (Ex) approved in accordance with
national and international regulations or a safety barrier.
– For the C-NET-Ex detector line, this is line adapter (Ex) FDCL221-Ex.
– For a collective detector line, these are safety barriers SB2 or SB3.
Please note the documents listed in the chapter 'Applicable docum
ents'.

About this document 1
Applicable documents
9
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Target groups
The information in this document is intended for the following target groups:
Target group Activity Qualification
Product Manager lIs responsible for information passing
between the manufacturer and regional
company.
lCoordinates the flow of information
between the individual groups of people
involved in a project.
lHas obtained suitable specialist training
for the function and for the products.
lHas attended the training courses for
Product Managers.
Project Manager lCoordinates the deployment of all
persons and resources involved in the
project according to schedule.
lProvides the information required to run
the project.
lHas obtained suitable specialist training
for the function and for the products.
lHas attended the training courses for
Project Managers.
Project engineer lSets parameters for product depending
on specific national and/or customer
requirements.
lChecks operability and approves the
product for commissioning at the place
of installation.
lIs responsible for trouble-shooting.
lHas obtained suitable specialist training
for the function and for the products.
lHas attended the training courses for
Product Engineer.
Installation personnel lAssembles and installs the product
components at the place of installation.
lCarries out a performance check
following installation.
lHas received specialist training in the
area of building installation technology
or electrical installations.
Maintenance personnel lCarries out all maintenance work.
lChecks that the products are in perfect
working order.
lSearches for and corrects malfunctions.
lHas obtained suitable specialist training
for the function and for the products.
There are various tasks that may only be performed by qualified persons in
accordance with the national implementation of Directive 2009/104/EC (e.g. in
Germany: Section 2 (7) of the Ordinance on Industrial Safety and Health
(BetrSichV)).
Source language and reference document
lThe source/original language of this document is German (de).
lThe reference version of this document is the international version in English.
The international version is not localized.
Document identification
The document ID is structured as follows:
ID code Examples
ID_ModificationIndex_Language_COUNTRY
-- = multilingual or international A6V10215123_a_de_DE A6V10215123_a_en_--
A6V10315123_a_--_--
Date format
The date format in the document corresponds to the recommendation of
international standard ISO 8601 (format YYYY-MM-DD).

1About this document
Applicable documents
10
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Conventions for text marking
Markups
Special markups are shown in this document as follows:
⊳Requirement for a behavior instruction
1.
2. Behavior instruction with at least two operation sequences
– Version, option, or detailed information for a behavior instruction
⇨Intermediate result of a behavior instruction
⇨End result of a behavior instruction
lNumbered lists and behavior instructions with an operation
sequence
[➙ X] Reference to a page number
'Text' Quotation, reproduced identically
<Key> Identification of keys
Supplementary information and tips
The 'i' sy
mbol identifies supplementary information and tips for an easier way of
working.
See also
2Applicable documents [➙11]

About this document 1
Applicable documents
11
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
1.1 Applicable documents
Document ID Title
001204 Principles, applications, installation, maintenance Fire alarm signal in
areas at risk of explosion
001227 Installation instructions Shunt Zener Diode SB2, SB3
001519 Installation instructions Input / output module DC1192
007228 Data Sheet Test equipment and accessories FDUD291, FDUD292,
FDUD293, RE6, RE7T, RE8ST, RE8STCO, RE10, FDUM291,
FDUM292, FDUL221, Sinteso-Test, FDUD29x-E
008250 Technical Manual Line tester FDUL221
009122 Technical manual Input/output module (transponder) FDCIO223
A6V10208532 Installation Sealing element FDBZ295
A6V10208546 Installation Detector base FDB20x/FDB201-AA, FDB22x/FDB221-AA,
Base attachment FDB291, Detector designation plate FDBZ291,
Dummy detector FDX291
A6V10208552 Installation Detector locking device FDBZ293
A6V10210416 FS720 Fire detection system - Commissioning, Maintenance,
Troubleshooting
A6V10210424 FS720 Fire detection system - Configuration
A6V10260486 Installation Alarm indicators, adapter frame, surface-mounted housing,
indicator housing, incl. washer FDAI92EX, FDAI93EX, AI330,
DCA1191, DJZ1193
A6V10324618 Planning, Mounting/Installation, Commissioning, Maintenance of fire
detection installations with addressed detector lines in potentially
explosive atmospheres
A6V10331076 Installation Base attachment wet FDB295, Detector designation plate
DBZ1193A, Protective cage DBZ1194, EMC-protective cage FDBZ294
A6V10333771 Technical Manual Line adapter (Ex) FDCL221-Ex
A6V10367523 Installation Automatic fire detector OOH740-A9-Ex
A6V10371417 Data sheet Automatic fire detector OOH740-A9-Ex
A6V10414910 Technical manual Zone module, external powered FDCI723
A6V10443621 Modernizing fire detection installations with multiple protocol detectors
in potentially explosive atmospheres
Please also observe the documentation for your fire detection system.
1.2 Download center
You can download various types of documents, such as data sheets, installation
instructions, and license texts via the following Internet address:
http://siemens.com/bt/download
lEnter the document ID in the 'Find by keyword' input box.
You will also find information about search variants and links t
o mobile
applications (apps) for various systems on the home page.

1About this document
Technical terms, abbreviations, and formula symbols
12
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
1.3 Technical terms, abbreviations, and formula
symbols
Term Explanation
AI Alarm indicator
ASA Advanced Signal Analysis
ES Product version
C-NET Addressed detector line
C-NET-Ex Addressed detector line in a potentially explosive atmosphere
downstream of a line adapter (Ex) FDCL221-Ex
K-MK Maximum current connection factor on a collective detector line
LED Light-emitting diode
Symbol Meaning
C
0 Maximum external capacity
C
C Maximum permissible cable capacitance
C
i Maximum internal capacity
I
0 Maximum output current
I
i Maximum input current
L
0 Maximum external inductivity
L
C Maximum permissible cable inductance
L
i Maximum internal inductivity
P
0 Maximum output power
P
i Maximum input power
R
C Resistance of the connection cable
T
aAmbient temperature in a potentially explosive atmosphere
U
iMaximum input voltage
U
m Maximum r.m.s. value of the alternating voltage.
Maximum permissible voltage of an associated item of electrical
equipment without canceling the energy limitation.
U
0 Maximum output voltage
You will find more technical terms in the glossary at the end of this document.
The symbols
used correspond to the EN
60079
-
11 standard.

About this document 1
Revision history
13
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
1.4 Revision history
The reference document's version applies to all languages into which the reference
document is translated.
The first edition of a language version or a country variant may, for example, b
e
version 'd' instead of 'a' if the reference document is already this version.
The table below shows this document's revision history:
Modification index Edition date Brief description
h 2015-02-02 Table listing published language versions corrected; base attachment wet
FDB295 added as optional accessory; sealing element FDBZ295 added; IP
protection category amended in 'Technical data' chapter; editorial changes
g 2014-07-22 Editorial changes
f 2014-05-08 Editorial changes
e 2014-02-04 Changes in chapter: parameter sets for addressed operation; editorial
changes
d2013-04-30 'Technical Ambient Supervision Alarm' added; editorial changes
c 2012-08-17 Labels adapted; Annex added
b 2012-06-15 Editorial changes
a 2012-05-11 First edition
The table below shows the published language versions with the corresponding
modification index:
Modification index en_-- de_-- fr_-- it_-- es_--
h X X X X X
g X X X X X
f – X – – –
e – X – – –
d X X – – –
c – X – – –
b – X – – –
a – X – – –
X = published
– = no publication with this modification index

2Safety
Safety instructions
14
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
2Safety
WARNING
Contradictory safety instructions
Risk of explosion caused by disregarding safety instructions
●Should safety instructions relating to explosion protection contradict other
safety instructions, please observe the safety instructions relating to explosion
protection.
2.1 Safety instructions
The safety notices must be observed in order to protect people and property.
The safety notices in this document contain the following elements:
lSymbol for danger
lSignal word
lNature and origin of the danger
lConsequences if the danger occurs
lMeasures or prohibitions for danger avoidance
Symbol for danger
This is the symbol for danger. It warns of risks of injury.
Follow all measures identified by this symbol to avoid injury or death.
Additional danger symbols
These symbols indicate general dangers, the type of danger or possible
consequences, measures and prohibitions, examples of which are shown in the
following table:
General danger Explosive atmosphere
Voltage/electric shock Laser light
Battery Heat

Safety 2
Safety regulations for the method of operation
15
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Signal word
The signal word classifies the danger as defined in the following table:
Signal word Danger level
DANGER DANGER identifies a dangerous situation, which will result directly in death or
serious injury if you do not avoid this situation.
WARNING WARNING identifies a dangerous situation, which may result in death or serious
injury if you do not avoid this situation.
CAUTION CAUTION identifies a dangerous situation, which could result in slight to
moderately serious injury if you do not avoid this situation.
NOTICE NOTICE
identifies possible damage to property that may result from non-
observance.
How risk of injury is presented
Information about the risk of injury is shown as follows:
WARNING
Nature and origin of the danger
Consequences if the danger occurs
●
Measures / prohibitions for danger avoidance
How possible damage to property is presented
Information about possible damage to property is shown as follows:
NOTICE
Nature and origin of the danger
Consequences if the danger occurs
●
Measures / prohibitions for danger avoidance
2.2 Safety regulations for the method of operation
National standards, regulations and legislation
Siemens products are developed and produced in compliance with the relevant
European and international safety standards. Should additional national or local
safety standards or legislation concerning the planning, mounting, installation,
operation or disposal of the product apply at the place of operation, then these
must also be taken into account together with the safety regulations in the product
documentation.

2Safety
Safety regulations for the method of operation
16
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Electrical installations
WARNING
Electrical voltage
Electric shock
●Work on electrical installations may only be carried out by qualified
electricians or by instructed persons working under the guidance and
supervision of a qualified electrician, in accordance with the electrotechnical
regulations.
lWherever possible disconnect products from the power supply when carrying
out commissioning, maintenance or repair work on them.
lLock volt-free areas to prevent them being switched back on again by mistake.
lLabel the connection terminals with external external voltage using a
'DANGER External voltage' sign.
lRoute mains connections to products separately and fuse them with their own,
clearly marked fuse.
lFit an easily accessible disconnecting device in accordance with IEC 60950-1
outside the installation.
lProduce earthing as stated in local safety regulations.
Mounting, installation, commissioning and maintenance
lIf you require tools such as a ladder, these must be safe and must be intended
for the work in hand.
lWhen starting the fire control panel ensure that unstable conditions cannot
arise.
lEnsure that all points listed in the 'Testing the product operability' section below
are observed.
lYou may only set controls to normal function when the product operability has
been completely tested and the system has been handed over to the customer.
WARNING
Work carried out by personnel who are not qualified
Risk of explosion
●Work in potentially explosive areas may only be carried out by qualified
specialists or by specially instructed persons, in accordance with the national
and international directives and regulations.
lYou must only mount, install, and test the devices if the atmosphere in the area
is not at risk of explosion.

Safety 2
Safety regulations for the method of operation
17
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Testing the product operability
lPrevent the remote transmission from triggering erroneously.
lIf testing building installations or activating devices from third-party companies,
you must collaborate with the people appointed.
lThe activation of fire control installations for test purposes must not cause
injury to anyone or damage to the building installations. The following
instructions must be observed:
lUse the correct potential for activation; this is generally the potential of the
building installation.
lOnly check controls up to the interface (relay with blocking option).
lMake sure that only the controls to be tested are activated.
lInform people before testing the alarm devices and allow for possible panic
responses.
lInform people about any noise or mist which may be produced.
lBefore testing the remote transmission, inform the corresponding alarm and
fault signal receiving stations.
Modifications to the system design and the products
Modifications to the system and to individual products may lead to faults,
malfunctioning and safety risks. Written confirmation must be obtained from
Siemens and the corresponding safety bodies for modifications or additions.
No changes may be made to devices with EC-type examination certificates.
Modules and spare parts
lComponents and spare parts must comply with the technical specifications
defined by Siemens. Only use products specified or recommended by
Siemens.
lOnly use fuses with the specified fuse characteristics.
lWrong battery types and improper battery changing lead to a risk of explosion.
Only use the same battery type or an equivalent battery type recommended by
Siemens.
lBatteries must be disposed of in an environmentally friendly manner. Observe
national guidelines and regulations.
Disregard of the safety regulations
Before they are delivered, Siemens products are tested to ensure they function
correctly when used properly. Siemens disclaims all liability for damage or injuries
caused by the incorrect application of the instructions or the disregard of danger
warnings contained in the documentation. This applies in particular to the following
damage:
lPersonal injuries or damage to property caused by improper use and incorrect
application
lPersonal injuries or damage to property caused by disregarding safety
instructions in the documentation or on the product
lPersonal injury or damage to property caused by poor maintenance or lack of
maintenance

2Safety
Standards and directiv
es complied with
18
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Disclaimer
We have checked that the content of this document matches the hardware and
software described. Despite this, we cannot rule out deviations and cannot
therefore assume liability for them matching completely. The details in this
document are checked regularly and any corrections needed included in
subsequent editions.
We are grateful for any suggestions for improvement.
2.3 Standards and directives complied with
A list of the standards and directives complied with is available from your Siemens
contact.
2.4 Release Notes
Limitations to the configuration or use of devices in a fire detection installation with
a particular firmware version are possible.
WARNING
Limited or non
-
existent fire detect
ion
Personal injury and damage to property in the event of a fire.
●Read the 'Release Notes' before you plan and/or configure a fire detection
installation.
●Read the 'Release Notes' before you carry out a firmware update to a fire
detection installation.
NOTICE
Incorrect planning and/or configuration
Important standards and specifications are not satisfied.
Fire detection installation is not accepted for commissioning.
Additional expense resulting from necessary new planning and/or configuration.
●Read the 'Release Notes' before you plan and/or configure a fire detection
installation.
●Read the 'Release Notes' before you carry out a firmware update to a fire
detection installation.

Structure and function 3
Setup
19
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
3Structure and function
3.1 Setup
3.1.1 Point detector OOH740-A9-Ex with ASAtechnology
View of point detector OOH740-A9-Ex
Properties
lSignal processing with ASA technology
lCan be used either addressed to the C-NET-Ex detector line or to collective Ex
detector lines
lCan be set as neural fire detector, wide-spectrum smoke detector or heat
detector on the software side
lSelectable detection behavior thanks to application-specific ASA parameter
sets
lAdjustable monitoring of ambient temperature based on hysteresis. The
configuration is set with the 'Cerberus-Engineering-Tool' software.
lIndication of the condition (alarm, localization or test) by means of a red LED
lMounting on the C-NET-Ex downstream of a line adapter (Ex) FDCL221-Ex
lWith collective detector lines, mounting downstream of an input/output module
DC1192 or FDCIO223 or a zone module FDCI723 and a safety barrier SB2 or
SB3
FDCL221-Ex
C-NET-Ex
FC72x
C-NET
Area not at risk Ex area
Use of several point detectors OOH740-A9-Ex on the C-NET-Ex downstream of a line
adapter (Ex) FDCL221-Ex

3Structure and function
Setup
20
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
Setup of the point detector
The point detector OOH740-A9-Ex has two optical and two thermal sensors.
1
2
3
4
1
Heat sensors
3
Forward scatterer
2
Backward scatterer
4
Labyrinth
The detector has a sophisticated opto-electronic measuring chamber with two
optical transmitters, an optical receiver, and two thermal sensors.
The transmitters illuminate the smoke particles from different angles. One sensor
acts as forward scatterer, the other as backward scatterer. The scattered light then
hits the receiver (photodiode) and generates a measurable electric signal.
The combination of a forward and backward scatterer facilitates an optimum
detection and the differentiation of light and dark particles, which leads to a
homogenous response behavior and optimizes the differentiation of wanted signals
and deceptive phenomena.
In addition, the heat sensors make it possible to detect fires without smoke
generation.
The combination of optical and thermal sensor signals optimizes detection
reliability. This has the following advantages:
lEarly detection of all types of fire, whether they generate light or dark smoke, or
no smoke at all.
lThe multisensor fire detector can be operated at a lower sensitivity level and
thus achieves a higher immunity against false alarms, which can be caused by
cold aerosols (e.g., by smoking). In the case of an open fire, the smoke
sensitivity is heightened by the temperature increase, which means that a
detection reliability level that is comparable to that of the wide-spectrum smoke
detector can be achieved.
The detector can also be used purely as an optical smoke detector or purely as a
heat detector. This is determined by selecting one of the following sensor modes:
lSensor mode 0: Application as neural fire detector
lSensor mode 1: Application as heat detector
lSensor mode 2: Application as smoke detector
See also
2Applicable documents [➙11]