Honeywell 705 Series Bedienungsanleitung

Sieger Type 705

CO Sensor and Transmitter for Electrochemical Cells

UL Certiﬁed 00705A1731

Operating Instructions

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

Ensure that you read and understand these Operating

Instructions BEFORE installing or operating any part of the

equipment.

Please pay particular attention to the Safety Warnings.

WARNINGS

1. To maintain safety standards, regular maintenance,

calibration and operation of this equipment by

qualified personnel is essential. Read and understand

this manual completely before operating or servicing

the equipment. If further details are required which

do not appear in this manual contact Zellweger

Analytics Limited or their agent.

2. TheCodeofPracticeregarding'Selection,Installation

and Maintenance of Electrical Apparatus for use in

Potentially Explosive Atmospheres' must be complied

with at all times. Refer to the appropriate local or

national regulations relative to the installation site.

Elsewhere the appropriate local or national

regulations should be used.

3. Operators must be fully aware of the action to be

taken if the gas concentration exceeds an alarm

level.

CAUTION

To maintain safety standards, regular maintenance,

calibration and operation of the equipment by qualified

personnel is essential.

HELPING TO MAKE A SAFER WORLD

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

IMPORTANT NOTICES

1. Zellweger Analytics Ltd 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 manual.

2. The user of this manual should ensure that it is

appropriate in all details to the exact equipment to

be installed and/or operated. If in doubt, the user

shouldcontactZellwegerAnalyticsLimitedforadvice.

3. If further details are required which do not appear in

this manual, contact Zellweger Analytics Limited or

one of their agents.

HELP US TO HELP YOU

Every effort has been made to ensure the accuracy in the

contents of our documents, however, Zellweger Analytics

Limited can assume no responsibility for any errors or

omissions in our documents or their consequences.

Zellweger Analytics Limited would greatly appreciate being

informed of any errors or omissions that may be found in the

contents of any of our documents and to this end we include

a form for you to photocopy, complete and return to us so

that we may take the appropriate action.

HELPING TO MAKE A SAFER WORLD

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

CONTENTS

Section Page

1. INTRODUCTION 7

1.1 General 7

1.2 Principle of Operation 7

1.3 Accessories 8

2. INSTALLATION 12

2.1 Unpacking 12

2.2 Sensor Orientation 12

2.3 Terminal Housings 12

2.4 Cable Connections 13

2.5 Fitting Sensors 14

3. FITTING ACCESSORIES 16

3.1 Collecting Cone 16

3.2 Weather Protection Housing 16

3.3 Sample Flow Housing 16

4. MAINTENANCE 18

4.1 General 18

4.2 Cleaning 18

5. CALIBRATION 19

5.1 General 19

5.2 Cross Interference From Other Gases 19

5.3 Sensor Life 19

5.4 Calibration Procedure 20

6. GASSING THE SENSOR 21

6.1 Equipment Required 21

6.2 Calibration Gassing Procedure 21

7. REPLACEMENT PARTS 22

7.1 Terminal Housings 22

7.2 Maintenance Spares 22

8. TYPE 705 SENSOR ALTERNATIVE SYSTEMS 23

9. SPECIFICATION 25

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

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MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

1.1 GENERAL

TheType705CarbonMonoxideSensorisatoxicgasdetector

certified for installation in a hazardous area. This version

uses an Electrochemical (ECC) Sensor, in conjunction with

an electronic circuit to form a three wire 4 - 20mA transmitter.

The sensor comprises an aluminium housing containing an

Electrochemical Cell with a sintered stainless steel disc

forming the face of the sensor. The housing has a 47mm AF

body with a 3/4 NPT mounting thread at one end and an M36

accessory thread on the other end. A plastic Filter Housing

screws on to the accessory thread and holds a Hydrophobic

Barrier in position when accessories are not fitted. There are

a number of accessories available for the 705 Sensor which

utilise the M36 accessory thread. Refer to Section 8 for

alternative systems to which the 705 Sensor can be

connected.

Note: New sensors are despatched with a protection disc

in place of the Hydrophobic Barrier. This disc should

not be removed until the sensor is installed or

commissioned.

1.2 PRINCIPLE OF OPERATION

ThesensorcontainsanElectrochemical Cell. Electrochemical

Cells are dynamic devices which generate a current in

proportion to gas concentration within the cell. As the current

output from the cell is in microamps, it is amplified and

processed by the electronics in the terminal enclosure. The

resulting signal in the range 4 - 20mA (representing

0 - 500ppm CO) can then be connected to equipment in the

safe area to provide alarm and concentration indications.

1. INTRODUCTION

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

1.3 ACCESSORIES

1.3.1 General

The following accessories are available for use with the

sensors:

a. Collecting Cone (Figure 2).

b. Weather Protection Housing (Figure 3).

c. Sample Flow Housing (Figure 4).

d. Hydrophobic Barrier.

e. Gassing Point Assembly (Figure 5).

1.3.2 Collecting Cone

The detection of a lighter than air gas is enhanced by the use

of a Collecting Cone. The cone fits onto the sensor accessory

thread in place of the Filter Housing and retains the

Hydrophobic Barrier.

1. INTRODUCTION

Figure 1 Type 705 Sensor and Filter Housing

Mounting Thread

Accessory Thread

Sintered Disc

Hydrophobic Barrier

(fit white side out)

Filter Housing

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

A nozzle on the cone permits gassing of the sensor with the

cone in position. The test gas is applied either direct to the

nozzle or via a permanently connected pipeline when the

sensor is fitted in an inaccessible location.

Figure 2 Collecting Cone

Nozzle

6.35 O/D 77.6mm

165mm

42mm

1.3.3 Weather Protection Housing

The Weather Protection Housing, fitted to a sensor installed

in an exposed location, affords protection from driving rain

from the vertical to 30° below the horizontal. When mounted

close to the ground, protection is afforded from heavy rain

rebounding off the ground. It also reduces contamination

from industrial waste and enables the application of a test

gas in high wind speeds without significant error.

The housing is fitted to the sensor accessory thread in place

of the Filter Housing and retains the Hydrophobic Barrier.

Incorporated in the housing is a nozzle to facilitate gassing

the sensor with the Weather Protection Housing in position,

either by direct application to the nozzle or via a permanently

connected pipeline. The nozzle is free to rotate within the

housing to allow removal from the sensor without

disconnecting a permanently connected pipeline, when

changing the Hydrophobic Barrier and cleaning the sensor.

1. INTRODUCTION

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

00705M5003

1.3.4 Sample Flow Housing

A Sample Flow Housing provides a means to sample gas

from a closed system, via two pipelines. The flow housing is

fitted to the sensor accessory thread by a locking ring,

enabling removal of the housing without disconnecting the

pipeline. The Hydrophobic Barrier is retained by the housing

and interfaces with a gasket bonded to the housing.

1. INTRODUCTION

Figure 4 Sample Flow Housing

61mm

45mm

31mm

30mm

Figure 3 Weather Protection Housing

50.8mm Dia

25.5mm

51.0mm

MAN0364.P65 Issue 03, Mar 01 705 Sensor CO

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1.3.5 Gassing Point Assembly

This assembly can be fixed at a convenient position and

permanently connected by suitable tubing to an inaccessible

sensor, thus simplifying the application of a test gas when

checking the sensor calibration. A DIN rail mounting

assembly (00785-A-0069) is available to enable five Gassing

1. INTRODUCTION

Point Assemblies to be mounted side by side.

1.3.6 Hydrophobic Barrier

The Hydrophobic Barrier consists of a layer of stainless

steel mesh with a rubber rim, with a Hydrophobic Barrier of

PTFE bonded onto its surface. This MUST be fitted with the

white surface facing outwards.

25mm

Gassing Tube Cap

Stainless Steel

Tube

120mm Dia

Yellow Nylon Block

70mm x 38mm x 19mm

Figure 5 Gassing Point Assembly

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