Halma Ampac Orbis IS ORB-OP-52027-APO User manual

Fire detection and evacuation solutions that save lives.
Orbis IS
Product Guide
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Contents
1 Introduction to Intrinsic Safety............................................................................................................ 3
2 Range of Products ............................................................................................................................... 5
3 Features of Orbis IS ............................................................................................................................. 5
4 Choosing a Detector: Q & A................................................................................................................. 6
5 Orbis IS Optical Smoke Detector.......................................................................................................... 9
5.1 Where to use optical smoke detectors.......................................................................................... 9
5.2 How does the Orbis IS optical detector work ................................................................................ 9
5.3 Enviornmental Performance:.......................................................................................................10
5.4 Classification ...............................................................................................................................10
5.5 Technical Data:............................................................................................................................10
6 Orbis IS Multisensor Smoke Detector.................................................................................................11
6.1 Where to use optical smoke detectors.........................................................................................11
6.2 How does the Orbis IS multisensor smoke detector work?...........................................................11
6.3 Enviornmental Performance:.......................................................................................................11
6.4 Technical Data:............................................................................................................................12
7 Orbis IS Heat Detector........................................................................................................................13
7.1 Where to use heat detectors: ......................................................................................................13
7.2 Choosing the correct class of heat detector? ...............................................................................13
7.3 How does Orbis IS heat detectors work?......................................................................................13
7.4 Environmental Performance:.......................................................................................................14
7.5 Technical Data:............................................................................................................................14
8 Orbis IS Base.......................................................................................................................................15
8.1 Installing Orbis IS:........................................................................................................................15
8.2 Fitting Orbis detector heads: .......................................................................................................17
8.3 Orbis LED Status Indication..........................................................................................................17
9 Orbis IS Adaptor .................................................................................................................................18
10 System Design ....................................................................................................................................18
10.1 Types of safety barrier.................................................................................................................18
10.2 Approved safety barriers .............................................................................................................19
10.3 Safety earth.................................................................................................................................20
11 Wiring and cable types.......................................................................................................................21
12 Maximum loading of IS circuit............................................................................................................23
13 Installation .........................................................................................................................................23
14 Remote LED connection .....................................................................................................................23
15 MiniDisc Remote Indicator.................................................................................................................23
16 Servicing.............................................................................................................................................24
17 Achnowledgement .............................................................................................................................24

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1Introduction to Intrinsic Safety
There are many places where an explosive mixture of air and gas or vapour is—or may be—present
continuously, intermittently or as a result of an accident. These are defined as hazardous areas by BS EN
60079, the code of practice for installation and maintenance of electrical apparatus in potentially explosive
atmospheres.
Hazardous areas are common in petroleum and chemical engineering plants and in factories processing and
storing gases, solvents, paints and other volatile substances.
Electrical equipment for use in these areas needs to be designed so that it cannot ignite an explosive
mixture, not only in normal operation but also in fault conditions. There are a number of methods available
to achieve this but one of the most common is intrinsic safety.
Orbis™IS is a range of conventional detectors which has been developed from the standard range of Orbis
smoke and heat detectors.
Orbis IS is a range with modern styling and a TimeSaver IS base. It is electrically compatible with Series 60
intrinsically safe conventional detectors.
Orbis IS is suitable for use in marine and offshore applications as well as in land-based systems and has
been tested and approved to the following standards:
European Standard EN54
Fire Detection and Fire Alarm Systems:
EN54–7: 2000
Optical smoke detector
EN54–7: 2000 & CEA 4021: 2003
Multisensor smoke detector
EN54–5: 2000
Heat detector
Electromagnetic Compatibility
EN61000-6-3
EN50130-4
ATEX-related standards:
BSEN60079–0:2004
IEC60079–0:2004
EN50020:2002 and EN/BSEN/IEC60079–26:2004
Marine type approval standards:
American Bureau of Shipping (ABS)
Rules for Building and Classing Steel Vessels 2006
Bureau Veritas (BV)
Rules for the Classification of Steel Ships 2005
Det Norske Veritas (DNV)
Standard for Certification No 2.4: 2004
Germanischer Lloyd (GL)
Rules for Classification and Construction 2003

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Lloyds Register (LR)
LR Type Approval System
Marine & Coastguard Agency (MCA)
Merchant Shipping (Marine Equipment) Regulations 1999
Detectors have been declared as being compliant with the essential requirements of the EMC Directive
98/336/EEC, the Construction Products Directive 89/106/EEC and the ATEX Directive 94/9/EC. Intrinsic
safety certificates for ATEX is Baseefa 06 ATEX 0007X and for IECEx IECEx BAS 06.0002X.

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2Range of Products
Orbis IS comprises an optical smoke detector, a multisensor smoke detector, heat detector classes A1R,
A1S, A2S, BR, BS, CR and CS and a standard electronics-free base
3Features of Orbis IS
Orbis IS incorporates entirely new designs, both mechanical and electronic. The aim has been to make
installation quicker, enhance the reliability of detection and reduce the incidence of false alarms.
Orbis IS features:
•Modern styling
•TimeSaver Base® designed for fast installation and cable termination
•Wide operating temperature range
•StartUp™for fast commissioning
•DustDefy™housing which limits ingress of dirt into detector
•New optical sensor for high reliability, reduced false alarm and insect related problems
•New multisensor smoke detector for detecting fast-burning fires
•Algorithms for transient rejection
•Chamber designed to inhibit dirt penetration and thus reduce false alarms
•Automatic drift compensation with DirtAlert® warning
•FasTest® which reduces the time taken to test detectors
•Optional flashing LED to indicate normal operation
•SensAlert® is a safety feature. In the unlikely event of incorrect detector operation a yellow LED
flashes once a second.

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4Choosing a Detector: Q & A
What types of detector are available in the Orbis IS range?
An optical detector, a multisensor smoke detector and seven classes of heat detector.
How can I tell the Orbis IS range from standard Orbis detectors?
Orbis IS detectors have a printed legend around the lid which identifies them and provides information as
to their classification. They must be used with a certified Orbis IS mounting base which also bears a printed
legend.
The Orbis IS range does not include an ionisation smoke detector. Why is this?
Ionisation detectors have been in use for many years as extremely reliable smoke detectors and standards
such as EN54 recommend both ionisation and optical detectors as good general purpose smoke detectors.
Ionisation detectors, however, use a tiny radioactive foil. Although they are entirely safe to use, ionisation
detectors are subject to strict regulations concerning transport, storage and disposal. Thus it is becoming
increasingly difficult to transport and hence use Ionisation detectors. Advances in optical technology mean
that optical or multisensor detectors can now be used where previously ionisation detectors would have
been fitted.
Should I use optical detectors to detect smoke in all applications?
As stated, optical detectors have long been recommended as good general purpose smoke detectors.
Laboratory tests have been carried out to compare the performance of optical detectors in the standard
test fires described in the European standard EN54–7: 2000. The results of these tests are given in Figure 1.
The graph shows the acceptable response in terms of smoke density which is given as ‘m’ on the y axis.
Detectors must respond before the end of test which is an ‘m’ value of 2. The performance of Orbis IS
detectors is given as a solid line which shows how evenly the optical detectors respond to the test fires. If
detectors respond too quickly (the lower shaded portion of the graph) they may be too sensitive and hence
likely to generate false alarms. If detectors respond too slowly (the upper shaded portion) they are in
danger of not changing to the alarm state before the end of test. An even response in the centre is the ideal
response.
When would I use a multisensor?
Multisensor smoke detectors have a heat sensing element which makes them more sensitive if a fire
develops heat as well as smoke. This speeds up the response of the detector in certain fires where heat is
generated rapidly, for instance in test fire TF5, which is an open, flaming liquid fire in which n-heptane is
burned.
Multisensor smoke detectors are recommended for open flaming fire risks. If there is any doubt as to
whether an optical detector or a multisensor smoke detector should be used it is wise to fit a multisensor
smoke detector.
Where would there be a need to install heat detectors?
Heat detectors could be used if it is not possible to use smoke detectors. This will be the case where normal
industrial processes produce substances which could be mistaken for smoke by a smoke detector, e.g. flour

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mills, textile mills or chemical stores. The type of substance encountered here would cause frequent false
alarms if smoke detectors were fitted, so a heat detector is used instead.
Figure 1 - Orbis Optical Detector Response to Test Fires
Figure 2 - Comparisons of Response between Orbis Optical & Multisensor
How are heat detectors classified?
EN54–5: 2000 classifies heat detectors according to the ambient temperature in which they will be working.
An additional classification may also be applied to heat detectors in that they may be tested as ‘static’
detectors (changing to alarm at a preset temperature) or ‘rate-of-rise’ (changing to alarm at a preset
increase of temperature).
All Orbis IS heat detectors are tested and classified as either static or rate-of-rise.

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So what is the best way to choose a heat detector?
To make things easier we have produced a flow chart to help you decide.
Figure 3 –Choosing a Heat Detector

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5Orbis IS Optical Smoke Detector
5.1 Where to use optical smoke detectors
Optical smoke detectors have always been recognised as good
detectors for general use. They are regarded as particularly suitable
for smouldering fires and escape routes.
The performance of Orbis IS optical detectors is good in black as
well as in white smoke. In this respect Orbis IS is different from
traditional optical smoke detectors which perform far better in
white smoke than in black. Orbis IS optical detectors are also
designed to reduce significantly the incidence of false alarms
through over-sensitivity to transient phenomena.
Item No
Part No
Description
201-0604
ORB-OP-52027-APO
Orbis I.S. Optical Smoke Detector
Orbis IS optical detectors are recommended for use as general purpose smoke detectors for early warning
of fire in most areas.
The sensing technology in the Orbis IS optical smoke detector is significantly different in design from
previous optical detectors. A full description is given in the section ‘How do Orbis optical smoke detectors
work?’ but the advantages of this system and its associated algorithms are:
•Improved sensitivity to black smoke
•Compensation for slow changes in sensitivity
•Extra confirmation of smoke before alarm signal given
The algorithms are used to verify signals from the sensing chamber, to filter out transients and to decide
when the detector should change to the alarm state. All this combines to increase detection reliability and
reduce false alarms.
5.2 How does the Orbis IS optical detector work
The Orbis Optical IS smoke detector operates on the well established light scatter principle. The remarkable
optical design of the Orbis IS optical smoke detector allows it to respond to a wide spectrum of fires.
The sensing chamber of the Orbis IS optical smoke detector contains an optical sensor which measures
back-scattered light as well as the more usual forward scattered light. Sensitivity to black smoke is greatly
improved. The detector is calibrated so that it is highly reliable in detecting fires but is much less likely to
generate false alarms than ionisation smoke detectors.
The stability of the detector–high reliability, low false alarm rate–is further increased by the use of
algorithms to decide when the detector should change to the alarm state. This removes the likelihood of a
detector producing an alarm as a result of smoke from smoking materials or from another non-fire source.
The sensing chamber has been designed to keep out dust and other airborne contaminants.

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5.3 Enviornmental Performance:
The operating temperature for intrinsically safe detectors is restricted by the gas temperature class. See
technical data for full details.
5.4 Classification
II 1G Ex ia IIC –40°C<Ta<+40°C(T5)
–40°C<Ta<+60°C(T4)
BASEEFA Certificate Number
ATEX - Baseefa 06 ATEX 0007X
IECEx - IECEx BAS 06.0002X
5.5 Technical Data:
Specifications are typical and given at 23°C and 50% relative humidity unless specified otherwise.
Detector operating
principle:
Photo electric detection of light scattered by smoke particles over a wide range
of angles. The optical management comprises an infra-red emitter with a prism
and photo-diode at 90° to the light beam with a wide field of view. The
detectors microprocessor uses algorithms to process the sensor reading.
Sampling frequency:
Once every 4 seconds
Supply voltage:
14-28V dc
Supply wiring:
2 wires, polarity sensitive
Polarity reversal:
Not allowed
Power-up time:
<20 seconds
Minimum detector
active voltage:
12V dc
Switch-on surge current:
105µA at 24V dc
Quiescent current:
85µA at 24V dc
Alarm load:
325Ωin series with 1.0V drop
Material:
Detector and base moulded in white polycarbonate
Alarm Indicator:
Integral indicator with 360° visibility
Dimensions and weight
of detector:
100mm diameter x 42mm H
75g
Dimensions and weight
inc base:
100mm diameter x 50mm H
135g
Operating and storage
temperature:
-40°C to +70°C
Operating temperature is restricted by the intrinsic safety gas classification.
Class T5: - 40°C to +40°C Class T4: - 40°C to +60°C
The detector must be protected from conditions of condensation or icing.
Humidity:
0% to 98% relative humidity (no condensation)
Wind speed:
Unaffected by wind
Atmospheric pressure:
Insensitive to pressure
IP rating:
23D to EN60529:1992*
Electromagnetic
compatibility:
The detector meets the requirements of BS EN61000-6-3 for emissions and BS
EN50 130-4 for susceptibility.
* The IP rating is not a requirement of EN54-7: 2000 since smoke detectors have to be open in order to
function. An IP rating is therefore not as significant as with other electrical products.