hazardous areas(orbisxp95is) new

7/31/2019 Hazardous Areas(OrbisXP95IS) NEW

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Fire detection forhazardous areas


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Equipment for Hazardous Areas

Electrical equipment for these areas needs to be designed sothat it cannot ignite an explosive mixture, not only in normaloperation but also in fault conditions.

There are a number of methods available to achieve this, forexample

oil immersion pressurised apparatus

powder filling

the two in most common use are

flameproof enclosures

intrinsic safety


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Equipment for Hazardous Areas

Flameproof equipment is contained in a box so strong that aninternal explosion will neither damage the box nor betransmitted outside the box. The surface must remain coolenough not to ignite the explosive mixture.

When flameproof equipment is interconnected, flameproofwiring must be used. This method is most valuable when highpower levels are unavoidable but it is not acceptable for areas inwhich an explosive gas/air mixture may be continuously presentor present for long periods.


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Detectors for Hazardous Areas

For this reason Apollo fire detectors are made intrinsicallysafe rather than flameproof.

Intrinsically safe equipment operates at such low power andwith such small amounts of stored energy that it is incapableof causing ignition

In normal conditions With a single fault (for ib classification)

With any combination of two faults (for ia classification)

In any of these conditions every component must remain coolenough not to ignite the gases for which it is approved.


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Ex i

Advantages of Intrinsic Safety> Least expensive no requirement for lockable fused isolators,

protected cable, special glands> Simple apparatus permits the use of normal industrial

devices if they are non-energy storing

> Fault tolerant the only technique which stays safe afterfaults develop in cables and fallible

components> Live maintenance the only technique which permits live

working without gas clearance certificates

> Unarmoured cable system is electrically not mechanically

protected> Safe for personnel extra low voltages and currents

> Safest technique only technique permitted for Zone 0


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Intrinsically Safe System Definition

A system comprising apparatus andinterconnecting wiring in which any spark orthermal effect in any part of the system intendedfor use in hazardous areas is incapable of causingignition.


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Basic Objectives of IS Design

Limit Stored Electrical Energy

Limit Surface Temperature

This is achieved by

Limiting Current

Limiting Voltage


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Both sources of Ignition MUST be considered

Spark

HotSurface

Ignition Sources


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Requirement for EquipmentClassification

Note: Apparatus Group = Gas Group

Equipmentis classified according to:

Temperature

Classification

Its maximum surface temperature

The maximum spark energy it can produce

ApparatusGroup


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Requirement for PlantClassification

Plant and Installationare classified according to:

AreaClassification

The probability that the Hazardous

Atmosphere will be present

Gas ClassificationTemperature Classification

The nature of the Hazardous Atmosphere


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Gas IgnitionTemperature

ApparatusTemperatureClassification

700

600

500

400

300

200

100Carbon Disulphide 100

Diethyl Ether 170

Cyclohexane 259

Butane 365

Ethylene 425Propane 470

Hydrogen 560Methane 595

Ammonia 630

Carbon Disulphide 100

Diethyl Ether 170

Cyclohexane 259

Butane 365

Ethylene 425Propane 470

Hydrogen 560Methane 595

Ammonia 630

T1 - 450

T2 - 300

T3 - 200

T4 - 135T5 - 100T6 - 85

T1 - 450

T2 - 300

T3 - 200

T4 - 135T5 - 100T6 - 85

T2 - 300

Gas/Equipment Compatibility


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Area Classification in IEC/EuropeanCountries

Areas are classified with regard to the probability of a potentiallyexplosive atmosphere being present and the length of time for which itis likely to exist

Zone 0

Category 1*

an explosive gas-air mixture is continuously

present or present for long periods

Zone 1

Category 2*

an explosive gas-air mixture is likely to occur in

normal operation

Zone 2

Category 3*

an explosive gas-air mixture is not likely to occurin normal operation, and if it occurs it will exist

only for a short time

* Refers to ATEX Directive


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Bund wall

Tank ventsArea Classificationfor a fixed-rooftank with heavierthan air vapour Zone 1

Zone 0

Zone 2

Flammable liquid

Area Classification Example


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Intrinsic Safety Categories

"Faults" are those in components upon whichsafety of the installation depends

Ex iaIntrinsically safe

with twofaults

Zones 0, 1 and 2

Ex ibIntrinsically safe

with onefault

Zones 1 and 2

Intrinsic safety is the only protection concept whichconsiders failure of the field wiring


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ATEX Classification

II 1 G

Equipment Groupand Category

Type of ExplosiveAtmosphere

G - gas, vapours ormists

D - dusts


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ATEX Classification

Ex ia IIC T5

ZoneClassification

Temperatureclassification(at ambienttemperature


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Orbis Intrinsically Safe Range

ATEX certified to ll 1 G Ex ia IIC T5 (T4 at Ta 40-60C)

optical detector

multisensor detector

range of heat detectors

unique base


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XP95 Hazardous Area Equipment

ATEX certified to ll 1 G Ex ia IIC T5 (T4 at Ta 40-60C)

ionisation detector

optical detector

heat detector

unique base

manual call points


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XP95 IS Manual Call Point XP95 IS Manual Call Point

55100-940 (red)

XP95 IS Manual Call Point

55100-942 (yellow)

XP95 IS Manual Call Point 55100-944 (blue)

IP67 rating

Compliant with EN54-11

Complies with ATEX directives 94/9/EC


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XP95 Safe Area Equipment

single channel protocol translator

dual channel protocol translator

These devices are for use in the designated safe area inconjunction with appropriate safety barriers/isolators


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XP95 Intrinsically Safe

low-profile design

pure white finish

high environmental performance

polarity sensitive easy to install

smooth action base

easy to clean

ATEX approved


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XP95 Intrinsically Safe

alarm flag and address for fast alarm reporting

automatic addressing with patented XPERT card

electronics-free base

digital transmission of data compatible with standard XP95 and Discovery


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14 - 18 V DC

0 1 06 V

IS Voltage Pulse Polling


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IS Current Pulse Response

14 - 18 V DC

6 V

0 110 mA


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Analogue to Digital (A/D)Conversion

Y-axisIonisation: voltage increaseOptical: obscuration %/mTemperature: increase

Y

XX-axis = digital count from analogue detector

45 550 25


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Control Panel Response TypicalThresholds

Fire

Pre-alarm

Normal

Fault

Digitalcount

55

45

8

0


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Wiring of XP95 IS Circuit toBS5830


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Typical Loop Configuration


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Using Dual Channel ProtocolTranslator


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Using Dual Channel ProtocolTranslator


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DIN Rail Interface Enclosure


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Control Equipment

40+ panels to choose from

wide choice to suit any application

built-in compatibility

technical assistance from Apollo engineers proven protocol

assured availability


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Marine Approvals

Both the Orbis IS and the XP95 IS ranges are approved by the

following authorities

Lloyds Register

Marine and Coastguard Agency

American Bureau of Shipping

Bureau Veritas

Det Norske Veritas

Germanischer Lloyd

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