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Honeywell Sensepoint Technical Manual

Gas detector
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Technical Manual
Sensepoint
Gas Detectors
2106M0525 Iss 2 Nov 05
1

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  Summary of Contents for Honeywell Sensepoint

  • Page 1 Technical Manual Sensepoint Gas Detectors 2106M0525 Iss 2 Nov 05...
  • Page 2 2106M0525 Iss 2 Nov 05...
  • Page 3: Safety

    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.
  • Page 4: Information

    Information Information 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.
  • Page 5: Table Of Contents

    Contents Contents Safety Information Introduction General Installation Location Tools Dimensions Mounting Electrical Cabling Power Wiring All Detectors EXCEPT Oxygen Oxygen Detectors ONLY Accessories Fitting an Outer Filter Maintenance Operational Life Sensor Replacement Junction Box Replacement Changing the Outer Filter Fault Finding Parts Sensors Other Parts...
  • Page 6 Contents 2106M0525 Iss 2 Nov 05...
  • Page 7: Introduction

    Introduction Introduction 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).
  • Page 8: General

    Introduction All versions of the detector are designed for connection to a dedicated controller, e.g. Touchpoint or Touchpoint (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 •...
  • Page 9: Installation

    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.
  • Page 10: Location

    IP64 must be achieved. This chapter provides the following information about installing Sensepoint: • locating the detector, see page 10 • tools required, see page 10 •...
  • Page 11: Tools

    • Hex Key, 4 mm (0.16 in.) A/F — for cover fixing screws. • 7 mm (0.28 in.) drill — for mounting holes Note Fixing screws/bolts are not supplied. Dimensions The subsequent diagrams show dimensions for Sensepoint. Note Diagram not to scale 2106M0525 Iss 2 Nov 05...
  • Page 12: Mounting

    The enclosure must be fixed in position using the external mounting lugs and not mounted using any type of cable entry device. Sensepoint should be fitted to a flat firm surface suitable for the unit’s size and weight, e.g. a wall, as follows: Drill two mounting holes in the surface.
  • Page 13: Electrical

    Installation Electrical Caution Cabling and wiring must be in accordance with the recognized standards of the appropriate authority in the host country and meet the electrical requirements of the detector and controller. Cabling Cabling may be SWA cable or conduit run. Wire size 1.0 to 2.5 mm (17 to 14 AWG) max., with suitable M20 explosion-proof gland, or 1/2 in.
  • Page 14 Installation Earth/Ground Point Star Ground/Earth Point Gas Detector Signal Enclosure 2 Enclosure 1 To avoid ground loops ONLY bond cable screens to ground/earth at the detector controller, but both To install cabling use the following procedure: Open the lid of the enclosure. Unscrew the four M4 captive securing screws, using a 4 mm (0.16 in.) A/F hex key wrench.
  • Page 15: Power

    Installation Power The toxic detector requires a power supply of 16-30 Vdc (at up to 30 mA). Ensure that a minimum supply of 16 Vdc is measured at the detector, taking into account the voltage drop due to cable resistance. For example, the nominal DC supply at the control panel has a guaranteed minimum supply of 18 Vdc.
  • Page 16 Installation Toxic/Oxygen Detector Screen (braided wire) Signal (blue) + Supply (red) Flammable Detector Sensitive Element (brown) Earth Terminal Non- Sensitive Center Tap Element (white) (blue) Close the lid of the enclosure and secure it. Cautions Ensure there is no moisture inside the enclosure before closing the lid.
  • Page 17: All Detectors Except Oxygen

    Installation There is a procedure for all sensors except oxygen, and one for oxygen only. The procedure activates the sensor before putting the detector into service. All Detectors EXCEPT Oxygen a. Remove the sensor cap. Unscrew the cap in a counter-clockwise direction. Refer to the following diagram. b.
  • Page 18 Installation d. Remove the supplied RFI screen and inner filter from the packing bag. e. Fit the two components to the sensor. Fit them in the order shown in the diagram. Insert both of them evenly. Push the inner filter into the neck of the sensor body until its locating tags click into place.
  • Page 19: Accessories

    To fit all the accessories refer to the instructions supplied with the item, except for fitting outer filters, see the following procedure. Fitting an Outer Filter This procedure applies to all types of Sensepoint gas detector. Refer to the following diagram. Remove the sensor cap (or accessory). Unscrew the cap/accessory in a counter-clockwise direction.
  • Page 20: Maintenance

    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.
  • Page 21: Operational Life

    Maintenance Operational Life The pellistors used in the flammable gas sensor can suffer from a loss of sensitivity when in the presence of poisons or inhibitors, e.g. silicones, sulfides, chlorine, lead or halogenated hydrocarbons. The pellistors are poison resistant to maximize the operational life of the flammable sensor. A typical operating life, subject to the presence of poisons/inhibitors is in excess of 3 years.
  • Page 22: Sensor Replacement

    Maintenance Sensor Replacement Caution ONLY replace a sensor with another of the same type. The gas detector is fitted with a replaceable sensor which has no user-serviceable parts. At the end of the sensor’s life replace it using the following procedure: To change a sensor carry out the following procedure: Isolate all associated power supplies and ensure that they remain OFF during the this procedure.
  • Page 23 Maintenance Grip the sensor collar firmly where it meets the enclosure and unscrew the sensor in a counter-clockwise direction. Refer to the warning about sensor handling and disposal at the start of this chapter. Fit the new sensor by reversing the removal procedure. Check that the replacement sensor is the correct type.
  • Page 24: Junction Box Replacement

    Maintenance Junction Box Replacement This section tells how to: • remove the sensor from the enclosure • replace the existing junction box with a replacement • refit the original sensor to the new box Carry out the following procedure, referring to the previous diagram: Isolate all associated power supplies and ensure that they remain OFF during the this procedure.
  • Page 25 Maintenance Refit the original sensor to the new box. Screw the sensor firmly in a clockwise direction into the enclosure base until tight. Refit the M20 locknut. Caution The locknut must be fitted to maintain certification. Reconnect the sensor wiring at the terminal block. Cautions All conductors must be fully tightened down within the terminals.
  • Page 26: Changing The Outer Filter

    Maintenance Changing the Outer Filter This procedure applies to all types of Sensepoint gas detector. Refer to the following diagram. Remove the sensor cap (or accessory). Unscrew the cap/accessory in a counter-clockwise direction. Remove the outer filter. Discard the old filter.
  • Page 27: Fault Finding

    No adjustments can be made at the detector, only Controller’s user zero at the controller. document Calibration fails at Replace detector See page 22 controller Contact Honeywell Analytics if the problem isn't resolved, see back page for contact information. 2106M0525 Iss 2 Nov 05...
  • Page 28: Parts

    Parts Parts This chapter lists part numbers for spare items and accessories. Sensors Caution ONLY replace a sensor with another of the same type. Gas Type Range Part No. Flammable 0-100% LEL Methane SPSTAXF1SS Toxic 0-50 ppm SPSTAXA1SS Ammonia 0-1,000 ppm SPSTAXA2SS 0-200 ppm SPSTAXC1SS...
  • Page 29: Other Parts

    Parts Other Parts Description Part No. SPSTJB ATEX approved, universal Junction box, complete with labels Accessories Description Part No. Flammable Sensor 02000-A-1635 Weather housing — includes remote gassing Toxic/oxygen Sensor 02000-A-1640 nozzle Collecting cone Flammable Sensor 02000-A-1642 Both detector types 02000-A-1645 Calibration Gas Flow housing...
  • Page 30: Specifications

    Specifications Specifications General Fixed point gas detector for the protection of personnel and plant from flammable, toxic or oxygen gas hazards. Detectable Gases Operating Temperature* Warm-up Gas Type/Gas Ranges (min) Minimum Maximum. 0-100% LEL Flammable <10 C (-40 C (122 Methane Toxic 0-50 ppm...
  • Page 31: Electrical

    Specifications Electrical Flammable Toxic/Oxygen Enclosure 3-wire mV bridge 2-wire loop powered Earth continuity plate 2.9-3.5 Vdc, 0.7 W (max.), 4-20 mA (plus screen), BK4 4-wire Terminal block constant current operation at 16-30 Vdc, 0.9 W 4-wire, 0.5 to 2.5 mm (20 -14 200 mA AWG).
  • Page 32 Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)1245 600560 Fax: +44 (0)1245 808399 Email: sales@keison.co.uk...