Honeywell 705 Series Operating Instructions Manual
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Honeywell 705 Series Operating Instructions Manual

Honeywell 705 Series Operating Instructions Manual

H2s sensor and transmitter for electrochemical cells ul certified
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Operating Instructions
Sensors Type 705
H 2 S Sensor and Transmitter for
Electrochemical Cells Ul Certified
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  • Page 1 Operating Instructions Sensors Type 705 H 2 S Sensor and Transmitter for Electrochemical Cells Ul Certified...

  • Page 2: Man0362.P65 Issue 03, Mar

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 HELPING TO MAKE A SAFER WORLD 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 To maintain safety standards, regular maintenance, calibration and operation of this equipment by...

  • Page 3: 00705M5001

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 HELPING TO MAKE A SAFER WORLD IMPORTANT NOTICES Zellweger Analytics Limited 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.

  • Page 4: Table Of Contents

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 CONTENTS INTRODUCTION General Principle of Operation Accessories INSTALLATION Unpacking Sensor Orientation Terminal Housings Cable Connections Fitting Sensors FITTING ACCESSORIES Collecting Cone Weather Protection Housing Sample Flow Housing MAINTENANCE General Cleaning CALIBRATION General Cross Interference From Other Gases Sensor Life Calibration Procedure...
  • Page 5 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001...

  • Page 6: Introduction

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 1. INTRODUCTION 1.1 GENERAL The 705 ECC Sensor (Figure 1) is a hydrogen sulphide toxic gas detector certified for installation in a hazardous area. This version uses an electrochemical sensor, in conjunction with an electronic circuit to form a 2-wire 4 - 20mA transmitter.

  • Page 7: Principle Of Operation

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 1. INTRODUCTION 1.2 PRINCIPLE OF OPERATION The sensor contains an Electrochemical Cell which generates an electrical current in proportion to gas concentration within the cell. Since the current output from the cell is in microamps, this is amplified and processed by the electronics in the terminal enclosure.
  • Page 8 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 1. INTRODUCTION 42mm Nozzle 6.35 O/D 77.6mm 165mm Figure 2 Collecting Cone 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 vertical to 30°...
  • Page 9 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 1. INTRODUCTION 50.8mm Dia 51.0mm 25.5mm Figure 3 Weather Protection Housing 1.3.4 Sample Flow Housing A Sample Flow Housing provides a facility to allow sampling of a closed system by means of two pipelines. The flow housing is fitted to the sensor accessory thread by a locking ring that enables the housing to be removed without disconnecting the pipeline.
  • Page 10 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 1. INTRODUCTION 1.3.5 Gassing Point Assembly The Gassing Point Assembl assembly can be fixed in a convenient position and permanently connected by suitable tubing to an inaccessible sensor, thus simplifying the application of test gas when checking sensor calibration. A DIN Rail Mounting Assembly (00785-A-0069) is available to enable five gassing point assemblies to be mounted side by side.

  • Page 11: Installation

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 2. INSTALLATION WARNING The Code of Practice regarding ‘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.

  • Page 12: Cable Connections

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 2. INSTALLATION Cable Entry Conduit Cable Entry Conduit Adalet X1HFC3L Killark Box with Terminal Housing 705 Sensor Figure 6 Terminal Housings 2.4 CABLE CONNECTIONS The sensor is connected by three wires to the terminals on the pcb: Connections Colour Code...

  • Page 13: Fitting Sensors

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 2. INSTALLATION Connection Terminals Span Zero Offset RFI Shield Plate Controls and Connections Figure 7 Circuit Board Assembly Connections 2.5 FITTING SENSORS WARNINGS Before installing the sensors, isolate the power supply by disconnecting or removing the associated control module from the installation.
  • Page 14 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 2. INSTALLATION When fitting a sensor to a metal thread, it is recommended that the mounting thread should be coated with an approved anti-seize compound, such as a light petroleum grease. Refer to Section 8 for alternative systems to which the sensor can be connected.

  • Page 15: Fitting Accessories

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 3. FITTING ACCESSORIES 3.1 COLLECTING CONE (00780-A-0032) To fit the Collecting Cone Assembly to a sensor, carry out the following: Remove the Filter Housing and gasket from the sensor. Fit the Hydrophobic Barrier, ensuring that the white surface faces away from the sinter.
  • Page 16 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 3. FITTING ACCESSORIES Fit the Hydrophobic Barrier, ensuring that the white surface faces away from the sinter. Screw the Sample Flow Housing on to the sensor and tighten with a 40mm A/F spanner. Set the sample flow rate to 1.5 ±...

  • Page 17: Maintenance

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 4. MAINTENANCE 4.1 GENERAL Maintenance consists of cleaning the sensor and accessories, replacing gasket and the Hydrophobic Barrier and gassing the sensor when testing the system. CAUTIONS The ECC cell contains a small quantity of acid. It is therefore necessary to comply with the current waste disposal regulations, either local or national, when disposing of a sensor.

  • Page 18: Calibration

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 5. CALIBRATION 5.1 GENERAL When testing and calibrating a gas detection system, the sensors must be gassed in accordance with the practice recommended for the particular installation. The sensor should be calibrated with hydrogen sulphide using the procedures detailed in Section 6.

  • Page 19: Calibration Procedure

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 5. CALIBRATION 5.4 CALIBRATION PROCEDURE Note: This procedure will produce an upscale output signal which may activate alarms if fitted. Refer to the Warnings in Installation section of the manual before proceeding. Allow a minimum warm-up period of 1 hour after applying power before carrying out this procedure.

  • Page 20: Gassing The Sensor

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 6. GASSING THE SENSOR 6.1 EQUIPMENT REQUIRED To test and calibrate the gas detection system, the following items are required: A suitable Calibration Gas Test Kit and a bottle of the appropriate test gas. Where the sensor accessories are not fitted, a Sample Flow Housing will be required for accurate sensor calibration.
  • Page 21 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 6. GASSING THE SENSOR CAUTION On Weather Protection Housings, upward pressure on the gassing nozzle forces the nozzle against the hydrophobic barrier. Do not rotate the nozzle when fitting the pipeline as this may cause damage. Open the valve of the calibration gas test kit and set the flow rate to 1.5 ±...

  • Page 22: Replacement Parts

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 7. REPLACEMENT PARTS Note: When ordering replacements parts, always quote the complete part number. Where a part number is not listed or known, state the type, material, cable entry size and other relevant details. 7.1 TERMINAL HOUSINGS Part No.

  • Page 23: Type 705 Sensor Alternative Systems

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 8. TYPE 705 SENSOR ALTERNATIVE SYSTEMS TOXIC SYSTEMS SAFE AREA HAZARDOUS AREA ASSEMBLY : 00705-A-1762 CONTROL SYSTEM 5700 TOXIC SENSOR CONTROL TRANSMITTER 00705-A-1730 CARDS 00705-A-1760 05700-A-0401 05700-A-0409 05700-A-3000 INTERFACE CARDS 05700-A-0950 05700-A-0951 05700-A-0952 05700-A-0953 INTERFACE...

  • Page 24: Specification

    MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 9. SPECIFICATION CERTIFICATION APPROVALS Certified for Class 1, Division 1, Groups B, C and D POWER REQUIRED 16 - 35V d.c (24V nominal). LINE RESISTANCE/LOAD RESISTANCE The graph shows the maxomum resistance allowed (cable + load), for various values of supply voltage, between the power supply and the 705 Sensor.
  • Page 25 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 9. SPECIFICATION ADALET X1HFC3L Dimensions: 115mm x 130mm x 88mm. Weight: 1.2kg. OPERATING RANGE 0 to 50ppm H ANALOGUE OUTPUT 4 - 20mA two wire. The ‘sensing resistor’ can be either connected between the fuse supply and the sensor (sinking current) or connected between the sensor and 0V (sourcing current).
  • Page 26 MAN0362.P65 Issue 03, Mar 01 705 Sensor 00705M5001 9. SPECIFICATION HUMIDITY Range: 0 to 90% RH non-condensing. Prolonged operation below 20% RH can reduce operating life of the cell. OVERALL DIMENSIONS AND WEIGHTS Sensor: Dimensions: 8mm x 55mm (47.2mm across flats). Weight: 270g.
  • Page 27 Thank you for reading this data sheet. Please contact us for a quotation: Head Office (UK) Switzerland Office P.O. Box 2124 Zugerstrasse 46 Chelmsford 6314 Unterägeri Essex CM1 3UP England Switzerland Tel: +44 (0)1245 600 560 Tel: +41 41 541 5877 Fax: +44 (0)1245 600 030 Fax: +41 41 541 5878 Email:...

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