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GDS 404 Series Operating Handbook

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T E C H N O L O G I E S
C922
Manual No. 043DIC
Issue E.v4
GDS404
SERIES
OPERATING HANDBOOK
This document is not contractual and the equipment specification may be modified at any time without prior notice.
E:
sales@gds-technologies.co.uk
T:
0113 286 0166
F:
0113 287 8178
www.gds-technologies.co.uk
GDS TECHNOLOGIES LTD
|
FUSION POINT
|
ASH LANE
|
GARFORTH
|
LEEDS
|
LS25 2GA
|
UK

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  • Page 1 SERIES OPERATING HANDBOOK This document is not contractual and the equipment specification may be modified at any time without prior notice. sales@gds-technologies.co.uk 0113 286 0166 0113 287 8178 www.gds-technologies.co.uk GDS TECHNOLOGIES LTD FUSION POINT ASH LANE GARFORTH LEEDS LS25 2GA...

  • Page 2: Table Of Contents

    Contents Description ..................................3 Technical Specification ................................. 4 Installation...................................5 Commissioning ..................................6 Service - routine attention ..............................8 Fax back sheet for service / maintenance plan ........................9 Table of lower explosive limits .............................10 Table of occupational exposure limits - P .P .M........................10 ILLUSTRATIONS Front View - Controls ..............................

  • Page 3: Description

    Description The GDS 404 is a multi channel combustible and toxic gas monitor, which can accommodate up to 4 sensor channels housed in wall mounting enclosure. Sensors may be added or removed as required, but should be carried out with the power to the unit switched off. Each sensor continuously monitors for gas, with the digital display sequentially sampling each sensor reading.

  • Page 4: Technical Specification

    Technical Specification NUMBER OF CHANNELS ONE, TWO, THREE OR FOUR CHANNELS OUTPUTS Common Relays - user selectable High alarm RL2 - D.P .C.O. normally energised or de-energised - factory set de-energised Latched or unlatched - factory set latched Low alarm RL1 - D.P .C.O. normally energised or de-energised - factory set de-energised Latched or unlatched - factory set latched Fault alarm RL3 - S.P .C.O.

  • Page 5: Installation

    Installation The GDS 404 Series control instrumentation is designed for installation in a safe area only. Siting of the instrument should be chosen with regard to the following points: (a) Cable within the enclosure should be cut back to the minimum length and having been terminated should be kept away from electronic components and the ribbon cable.

  • Page 6: Commissioning

    POISONING OF CATALYTIC SENSORS Catalytic elements used in flammable gas sensors are liable to be rendered inactive due to ‘poisoning’ by certain groups of compounds. In general contact with any gaseous compound capable of producing an involatile residue upon heating is to be avoided.
  • Page 7 ALARM LEVEL ADJUSTMENT 1. Alarm levels may be adjusted as follows: - For toxic/flammable gases zero the instrument in clean air using the zero potentiometer (for ambient oxygen monitoring the meter should be adjusted to read 20.8 using the s-span potentiometer). 2.

  • Page 8: Service - Routine Attention

    Service – routine attention The owner or occupier of the premises should place the supervision of the system in the charge of a responsible executive whose duty it should be to ensure the day to day operation of the system and to lay down the procedure for dealing with a gas alarm or fault warning.

  • Page 9: Fax Back Sheet For Service / Maintenance Plan

    T E C H N O L O G I E S SERVICE / MAINTENANCE PLAN GDS Technologies can offer comprehensive maintenance & service cover on all of your gas detection systems. Should you require further details, please complete and fax / return this document for an immediate response.

  • Page 10: Table Of Lower Explosive Limits

    Table of lower explosive limits - L.E.L. The figures quoted below are taken from British Standards Institute publication BS EN 60079-20-1:2010 and show the L.E.L. of some of the more common gases and vapours: L.E.L. % VOLUME Acetone ................2.5 Ammonia .....

  • Page 11: Fig. 1

    Fig. 1 %LEL %VOL TEST RESET HOLD Range Indicator L.E.L. Lower Explosive Limit Parts Per Million % vol. % Volume High Alarm Low Alarm Channel Selection (Sensor) Fault Indicator Power On (Green) Mains Fail (Red) Hold Channel Selection Reset Sounder/Alarms Test Electronic System Test...

  • Page 12: Display Boards

    Fig. 2 Display Boards On the original display board “A” the channel numbers are ordered (1…2…3…4) but on the new compact display board “B” the channel numbers are ordered (4…3…2…1). All functions are the same with either display board. For Channel Numbers 1-4 jumper section allows the LED indicating the gas measurement units to be selected. The options are %LEL, PPM and %VOL and are channel specific.

  • Page 13: Mother Board Detail And Field Terminals

    Fig. 3 Mother Board RELAY SELECTION Common High Relay - Normally energised/Normally de-energised - (J3) Common Low Relay - Normally energised/Normally de-energised - (J1) Common Fault Relay - Normally energised/Normally de-energised - (J5) Channel relays (1-4) A/B (Lo/Hi) see alarm board page 14 SOUNDER PERMANENT MUTE JP10 remove STANDBY BATTERY...

  • Page 14: Alarm Board - Component Layout

    24v (4/20mA input) P - Pellistor (mV input) 4~20MA OUTPUT TP3/TP4 CALIBRATION TP1/TP2 ADJUSTMENTS Potentiometer Sensor Zero Potentiometer Sensor Calibration Potentiometer 4~20mA signal output - 4mA adjust Potentiometer 4~20mA signal output - 20mA adjust Potentiometer GDS 404 display span (factory set) Potentiometer Sensor Supply...

  • Page 15: Sensor Termination

    Fig 4 Fig. 5 Fig 4 3 WIRE SENSOR mV - pellistor / CV / IR Combi direct sensor Panel Panel sensor Transmitter Transmitter SENSOR – 3 WIRE +24V Gas Detector Detector Head Y SIG Control Unit mV (pellistors) or 3 wire CV Y SIG Sensor 4~20mA...
  • Page 16 TRANSMITTER No C Nc Output Signal JP1 Jumpers AD 2 Wire Adjust no 4~20mA Alarm signal Field Terminals to ON/Zero GDS alarm unit D C B A Sensor ZERO Relay JP1 Jumpers DB Volts 3 Wire 20mA Sink Relay Sensor...

  • Page 17: Cv Transmitter - Toxic Oxygen

    Powered Alarm Test Points FIELD TERMINALS TO GDS ALARM PANEL TRANSMITTER JPI Jumpers DB Relay Field Terminals 3 Wire Sensor to GDS Alarm Unit Sink Terminal 20mA Relay W Y R Sounder JPI Jumpers AC Output 3 Wire Sensor Source...

  • Page 18: Xdi-Xdi Win / 30J Flammable Sensor

    PC or laptop (dedicated) 12. When using a PC press (S) to enter span mode and using Hyperterminal (download from GDS website) (H) or (L) adjust the reading to 56% LEL. 13. Press (space) to exit span and then (X) to exit the calibration Set up procedure: mode.
  • Page 19 An amber LED on the front panel under the (RV4) SEM-1 4v/170mA LCD flashes when the sensor is inhibited. When all magnets are GDS PRIME 4v/125mA removed, the display will revert to normal operation. Span CAT335C 2.5v/335mA...

  • Page 20: Xdi-Xdi Win / 30J Toxic/Oxygen Sensor - 4/3/2 Wire Sensor

    Press ‘A’ to change the address of this sensor if required PC or laptop (dedicated) d. Press ‘N’ to select the number of decimal places to 1 or Hyperterminal (download from GDS website) 2, (ie: dp=1 or dp=2) Set up procedure: e.
  • Page 21 End-of-line Jumper FIELD TERMINALS 4-20mA Test Jumper T E C H N O L O G I E S 24V Can+ Can- OV 4-20mA Addressable 4-20op Test Points Sensor Control Unit Technical Sheet 4-20 ref C894 Using magnets (set up) OV 4-20 4-20mA SInk/Source The Combi sensors which have an LCD display fitted also...

  • Page 22: Xdi-Xdi Win / 30J Prime Sensor

    PC or laptop (dedicated) 12. When using a PC press (S) to enter span mode and using Hyperterminal (download from GDS website) (H) or (L) adjust for the correct reading. 13. Press (space) to exit span and then (X) to exit the calibration Set up procedure: mode.
  • Page 23 T E C H N O L O G I E S Technical Sheet ref C1698B End-of-line Jumper Using magnets (set up) FIELD TERMINALS The Combi sensors which have an LCD display fitted also Removing both magnets as instructed on the LCD presents the 4-20mA Test Jumper incorporate 3 reed switches which can be activated using external...

  • Page 24: Xdi-Xdi Win / 30J 4~20Ma Input

    an+ Can- OV 4-20mA 4-20op Test Points Addressable /Source Sensor Control Unit 4-20 Fig. 11 XDI-XDIwin – 15/30J 4~20mA mitting LED OV 4-20 4-20mA SInk/Source CAN 1 or 2 T E C H N O L O G I E S 4~20mA INPUT 4~20mA CAN Transmitting LED...
  • Page 28 This document is not contractual and the equipment specification may be modified at any time without prior notice. sales@gds-technologies.co.uk 0113 286 0166 0113 287 8178 www.gds-technologies.co.uk GDS TECHNOLOGIES LTD FUSION POINT ASH LANE GARFORTH LEEDS LS25 2GA...

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