Honeywell Sensepoint Manuel utilisateur

2106M0525 Iss 2 Nov 05 1

Sensepoint

Gas Detectors

Technical Manual

2106M0525 Iss 2 Nov 05 2

Safety

2106M0525 Iss 2 Nov 05 3

Ensure that this Technical Manual is read and understand BEFORE installing/operating/maintaining

the equipment.

Pay particular attention to Warnings and Cautions.

All document Warnings are listed here and repeated where appropriate at the start of the relevant

chapter(s) of this Technical Manual. Cautions appear in the sections/sub-sections of the document

where they apply.

WARNINGS

Sensepoint

is designed for installation and use in Zone 1 or 2 hazardous

areas in Europe. Installation must be in accordance with the recognized

standards of the appropriate authority in the country concerned.

Before carrying out any work ensure local regulations and site procedures

are followed. Appropriate standards must be followed to maintain

the overall certification of the detector.

Access to the interior of the detector, when carrying out any work, must only be

conducted by trained personnel. Switch off and isolate the power supply

to the detector when access is required.Take any necessary

precautions to prevent false alarms.

Never attempt to open a junction box/enclosure or replace/refit the sensor

when flammable/toxic gas is present.

The detector must be earthed for electrical safety and to limit the effects of

radio interference. An earth point is provided inside the unit. Ensure that

all screens/armor are grounded at a single earth star point at the controller

or detector - BUT NOT BOTH - to prevent false alarms due to earth loops.

Take care when handling sensors as they may contain corrosive solutions.

Do not tamper or in any way dis-assemble the sensor.

Do not expose to temperatures outside the recommended range.

Do not expose sensor to organic solvents or flammable liquids.

At the end of their working life, sensors must be disposed of in

an environmentally safe manner. Disposal should be according to local

waste management requirements and environmental legislation.

Alternatively, sensors may be securely packaged and returned to

Honeywell Analytics clearly marked for environmental disposal.

Electrochemical cells should NOT be incinerated as they

may emit toxic fumes.

When replacing the gas detector’s junction box ensure that the correct

gas label is affixed to the replacement enclosure.

Safety

Information

2106M0525 Iss 2 Nov 05 4

Honeywell Analytics can take no responsibility for installation and/or use of its equipment if this is

not done in accordance with the appropriate issue and/or amendment of the Technical Manual.

The reader of this Technical Manual should ensure that it is appropriate in all details for the exact

equipment to be installed and/or operated. If in doubt, contact Honeywell Analytics for advice.

The following types of notices are used throughout this Technical Manual:

WARNING

Identifies a hazardous or unsafe practice which could result in

severe injury or death to personnel.

Caution Identifies a hazardous or unsafe practice which could result in minor

injury to personnel, or product or property damage.

Note Identifies useful/additional information.

Every effort has been made to ensure the accuracy of our documents, however, Honeywell Analytics

can assume no responsibility for any errors or omissions in our documents or their consequences.

Honeywell Analytics greatly appreciates being informed of any errors or omissions that may be

found in the contents of any of our documents.

For information not covered in this document, or there is a requirement to send comments/

corrections about this document, please contact Honeywell Analytics.

Honeywell Analytics reserve the right to change or revise the information supplied in this document

without notice and without obligation to notify any person or organization of such revision or change.

If information is required that does not appear in this document, contact the local distributor/agent

or Honeywell Analytics.

Information

Contents

2106M0525 Iss 2 Nov 05 5

Safety 3

Information 4

Introduction 7

General 8

Installation 9

Location 10

Tools 11

Dimensions 11

Mounting 12

Electrical 13

Cabling 13

Power 15

Wiring 15

All Detectors EXCEPT Oxygen 17

Oxygen Detectors ONLY 17

Accessories 19

Fitting an Outer Filter 19

Maintenance 20

Operational Life 21

Sensor Replacement 21

Junction Box Replacement 23

Changing the Outer Filter 26

Fault Finding 27

Parts 28

Sensors 28

Other Parts 29

Accessories 29

Specifications 30

General 30

Detectable Gases 30

Electrical 31

Physical 31

Certification 31

Applicable Standards 31

Environmental 31

Contents

2106M0525 Iss 2 Nov 05 6

Introduction

2106M0525 Iss 2 Nov 05 7

The Sensepoint gas detector consists of a certified enclosure fitted with a replaceable certified gas

sensor that can be used to detect gas indoors or outdoors in ATEX certified hazardous areas in

Europe, and also in safe areas. It is protected against water and dust ingress to IP65 (IP66 with

Weather housing

fitted).

The detector is supplied with one of 3 types of sensor to monitor different gases present in ambient

air:

• Flammable

• Toxic

• Oxygen

Flammable detector (%LEL) — this version measures flammable gas concentrations below the

Lower Explosive Limit (LEL) of the target gas for which it is calibrated. It features a poison-resistant

catalytic pellistor sensor device which forms part of a bridge measuring circuit.

Toxic detector — detects toxic gas, present in ambient air. Detectors measuring gas in parts per

million (ppm) concentrations are available for detecting carbon monoxide (CO), hydrogen sulfide

(H2S), hydrogen (H2), sulfur dioxide (SO2), nitrogen dioxide (NO2), and ammonia (NH3) gas. The

Toxic and oxygen detectors feature a local amplifier for operation as part of a 4-20 mA circuit.

Oxygen detector — measures oxygen deficiency levels in air in percent by volume (%V/V)

concentrations.

The detector gas type is shown on a label on the enclosure’s lid.

Terminal Block

Earth

Terminal

Earth Plate

Mounting Lug

½”

Cable Entry

NPT

M20

Cable Entry

3/4” Cable EntryNPT

Sensor

Enclosure

Base

(GRP)

Sensor

Lock Nut

Lid Captive

Securing Screws

(4 off)

Cover

Gasket

Earth Continuity

Plate

Introduction

2106M0525 Iss 2 Nov 05 8

All versions of the detector are designed for connection to a dedicated controller, e.g. Touchpoint1

or Touchpoint4(contact your distributor for details).

The detector’s construction allows unit dismantling for:

• gas sensors to be easily changed

• cabling to be routed and terminated

• commissioning/maintenance

• accessories to be fitted

The detector’s screw-in sensor cannot be repaired but is replaced as a complete unit.

The certified enclosure acts as a junction box and is fitted with 3 cable entries and a 4-wire terminal

block. The gas sensor is fitted to a tapped hole in the enclosure and is secured with a locknut.

The enclosure features a hinged lid that facilitates installation by a single technician when making

electrical connections/changing the sensor.

The terminal block is used to connect sensor power/signals to an external controller. The three cable

entry positions are fitted with approved seals. An earth continuity plate with earth terminal is fitted

for added RFI protection.

All the detector types can be fitted with a range of accessories, e.g. filter, weather housing, collecting

cone, and calibration gas flow adaptor.

Proper consideration must be made when locating the detector to ensure trouble free operation

throughout its life.

General

This document consists of the following chapters:

• Introduction

• Installation, see page 9

• Maintenance (including fault finding), see page 20

• Parts, see page 28

• Specification, see page 30

• Certification, see page 33

Installation

2106M0525 Iss 2 Nov 05 9

WARNINGS

Sensepoint

is designed for installation and use in Zone 1 or 2 hazardous

areas in Europe. Installation must be in accordance with the recognized

standards of the appropriate authority in the country concerned.

Before carrying out any work ensure local regulations and site procedures

are followed. Appropriate standards must be followed to maintain

the overall certification of the detector.

Access to the interior of the detector, when carrying out any work, must only be

conducted by trained personnel. Switch off and isolate the power supply

to the detector when access is required.Take any necessary

precautions to prevent false alarms.

Never attempt to open a junction box/enclosure or replace/refit the sensor

when flammable/toxic gas is present.

The detector must be earthed for electrical safety and to limit the effects of

radio interference. An earth point is provided inside the unit. Ensure that

all screens/armor are grounded at a single earth star point at the controller

or detector - BUT NOT BOTH - to prevent false alarms due to earth loops.

Take care when handling sensors as they may contain corrosive solutions.

Do not tamper or in any way dis-assemble the sensor.

Do not expose to temperatures outside the recommended range.

Do not expose sensor to organic solvents or flammable liquids.

At the end of their working life, sensors must be disposed of in

an environmentally safe manner. Disposal should be according to local

waste management requirements and environmental legislation.

Alternatively, sensors may be securely packaged and returned to

Honeywell Analytics clearly marked for environmental disposal.

Electrochemical cells should NOT be incinerated as they

may emit toxic fumes.

When replacing the gas detector’s junction box ensure that the correct

gas label is affixed to the replacement enclosure.

Cautions The detector’s enclosure is suitable for installation within an

explosive atmosphere as described in EN50014.

Installation must be in accordance with EN60079 and current wiring

regulations of the country where the enclosure is installed.

The marking on the detector cover label must match the ambient

temperature where the enclosure is installed.

The detector enclosure is manufactured from glass-filled polyester

(GFP) and fitted with stainless steel cover fixing screws, neoprene (or

silicone) ‘O’ ring, and brass earth screws.

Installation

2106M0525 Iss 2 Nov 05 10

Contact with aggressive substances may affect the performance of

these materials.

The detector is intended for use under normal industrial conditions

and must not be installed in an area where extreme vibration may

occur.

The enclosure has been tested to IP66 and with the cover fully

tightened down and the use of suitable cable entry devices will

maintain this protection under normal working conditions, however a

minimum protection of IP64 must be achieved.

This chapter provides the following information about installing Sensepoint:

• locating the detector, see page 10

• tools required, see page 10

• detector dimensions, see page 11

• mounting the detector, see page 11

• cabling, see page 13

• power, see page 15

• wiring, see page 15

• fitting accessories, see page 19

Location

Honeywell can be installed indoors or outdoors.

The following sources give guidance when installing gas detectors:

• EN50073:1999 Guide for selection, installation, use and maintenance of apparatus for the

detection and measurement of combustible gases or oxygen

• International codes of practice

• specifications defining minimum gas detection requirements for specific applications

published by regulatory bodies

Mount the detector where gas is most likely to be present, noting the following points:

• for lighter-than-air gases mount the detector at a high level and preferably with the Collecting

Cone accessory fitted

• mount at a low level for heavier-than-air gases

• if installed outdoors always consider possible damage caused by natural events, e.g. rain or

flooding

• Ensure that a Weather Cover is fitted.

• ensure ease of access to the unit for commissioning and maintenance

• consider how escaping gas may behave due to natural or forced air currents

• check any associated process line conditions — gases may be normally heavier than air, but

if released from a process that is at an elevated temperature and/or under pressure, the gas

may rise rather than fall

• Document the agreed location of detectors

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