GDS 404 Series, Operating Handbook

Page 1: ... 8178 GDS TECHNOLOGIES LTD FUSION POINT ASH LANE GARFORTH LEEDS LS25 2GA UK www gds technologies co uk This document is not contractual and the equipment specification may be modified at any time without prior notice C922 Manual No 043DIC Issue E v4 GDS404 SERIES OPERATING HANDBOOK ...

Page 2: ...ail and Field Terminals 13 4 Alarm Board Component Layout 14 5 Sensor Termination 15 6 CV Transmitter Toxic Oxygen 16 7 CV Transmitter Flammable 17 8 XDI XDI win 30J Flammable Sensor 18 9 XDI XDI win 30J Toxic Oxygen Sensor 4 3 2 wire sensor 20 10 XDI XDI win 30J Prime Sensor 22 11 XDI XDI win 30J 4 20mA Input 24 SYSTEM DATA Manufacture date Works Order No Sensor type life life life life Gas Range...

Page 3: ...sitioned directly above the panel meter L E L Lower Explosive Level PPM Parts Per Million and Volume each sensor is addressed to indicate its appropriate range MAINS ON LAMP P GREEN indicates that power is being supplied to the control unit When the optional standby battery is fitted loss of mains supply will result in the GREEN Mains ON Lamp changing to RED ALARM LAMPS C1 C2 C3 C4 Lo and Hi RED i...

Page 4: ... screened cable mineral insulated copper sheathed or steel wire armoured maximum cable loop resistance 20 ohms Toxic Oxygen 3 core 0 5 mm screened cable mineral insulated copper sheathed or steel wire armoured maximum cable loop resistance 200 ohms POWER SUPPLY 230 110v AC 50 60Hz or 24v DC 21 30 volts tolerance POWER CONSUMPTION Per channel Normal operating condition 3w Full alarm condition 4 5w ...

Page 5: ... As the gas rises it draws air from the surroundings and creates a turbulence Resulting from this there occurs rapid dilution and unless a sensor is positioned within the plume there will be no initial indication of a leak As gas continues to escape the diluted concentration rises to ceiling level and begins to layer In time the concentration at ceiling level will increase and this in turn will di...

Page 6: ...ere an internal standby battery has been supplied the connectors should be made on JP11 and JP12 Re set alarms by pressing the reset button located on the front panel Allow ten minutes for the sensors to stabilise Select channel 1 and for flammable or toxic sensors adjust meter to read zero by means of appropriate ZERO POTENTIOMETER marked Z on the alarm module or for oxygen sensor adjust the s sp...

Page 7: ... or TP2 on the mother board and sv test point on each sensor board will provide a mV reading proportional to mA s supplied adjustment may be carried out using the sensor volts adjustment potentiometer Alternatively the sensor voltage may be set at the detector head across terminals P and W VQ21 2v VQ23 DCP 2 5v and again use the sensor volts adjust potentiometer 4 20MA OUTPUT ADJUSTMENT Adjustment...

Page 8: ... sensitivity a check on calibration should be carried out TWICE YEARLY MAINTENANCE SCHEDULE 1 All zeros at the control unit to be checked logged and aligned 2 Each detector to be gas tested and reading logged sensitivity checked 3 Field indicators to be tested 4 All alarm set points checked and re aligned 5 Lamp Test 6 All faulty parts replaced where required 7 All filter elements checked and repl...

Page 9: ...ies co uk T E C H N O L O G I E S FAX BACK SHEET 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 Company Name Company Address Tel No Fax No Site Location if different from above Contact Name Product Type if known ...

Page 10: ...n Butane 1 4 Carbon monoxide 10 9 Ethylene 2 3 Heptane 0 85 Hexane 1 0 Hydrogen 4 0 Methane 4 4 Propane 1 7 Pentane 1 1 Toluene 1 0 Xylene 0 9 Table of occupational exposure limits P P M The figures quoted below are taken from guidance note EH40 from the Health and Safety Executive and ACGIH GAS 8 HOUR T W A P P M Hydrogen sulphide 5 Carbon monoxide 30 Sulphur dioxide 2 Nitrogen monoxide 25 Nitrog...

Page 11: ...e Indicator L E L Lower Explosive Limit PPM Parts Per Million vol Volume Hi High Alarm Lo Low Alarm C1 C4 Channel Selection Sensor F Fault Indicator P Power On Green Mains Fail Red Hold Channel Selection Reset Sounder Alarms Test Electronic System Test Fig 1 ...

Page 12: ...easurement units to be selected The options are LEL PPM and VOL and are channel specific See labelling on PCB for correct jumper location Likewise a selection can be made for each of the four channels to show either 1 or 2 decimal places with the jumper on or no decimal places with the jumper off See labelling on PCB for correct jumper location Finally there is a global jumper ON OFF selection for...

Page 13: ...mally 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 Connect leads to JP11 and JP12 ...

Page 14: ... Oxygen Alarm Set Low Low Alarm LL Time delay to alarm T1 10 secs T2 30 secs When used with GDS300 Flow sample systems FS SENSOR SELECTION 24v 4 20mA input P Pellistor mV input 4 20MA OUTPUT TP3 TP4 CALIBRATION TP1 TP2 ADJUSTMENTS Potentiometer RV1 Sensor Zero Potentiometer RV2 Sensor Calibration Potentiometer RV3 4 20mA signal output 4mA adjust Potentiometer RV4 4 20mA signal output 20mA adjust P...

Page 15: ... Unit Transmitter W Y P 24V OV SIG Sensor Sensor Sensor TOXIC SENSOR CELL OXYGEN P W Y P Y Fig 5 RED ident R flammable YELLOW ident Y toxic BLUE ident B oxygen GREEN ident G others W Y P W Y SIG P Fig 4 W Y P 24V Hi Lo Ov 4 20mA Panel W Y P 24V OV SIG Panel IR Transmitter W Y P 24V Hi Lo Ov 4 20mA W Y P W Y SIG P Panel 2 wire sensor Transmitter Panel Combi direct sensor Transmitter Panel Combi dir...

Page 16: ...el and the sensor is to be calibrated for Methane which has an L E L of 5 vol when using 1 Methane in air test gas 20 L E L a reading of 7 2mv 7 2mA would be required Where a Digital panel meter is fitted the display may be adjusted by using the DPM S potentiometer span ADDITIONAL RELAY BOARD ALARM TRIP POINT ADJUSTMENT This level will normally be set at 20 of the range reading i e 7 2mA 1 Connect...

Page 17: ...ircuit board 4 For oxygen level monitoring remove the sensor terminal connector from the PCB J4 and adjust the 4mA potentiometer for 4mA 4mv Reconnect the cell and allow reading to stabilise adjust the DVM reading for 17 3mA 20 8 Vol ambient oxygen using the 20mA potentiometer Where a Digital panel meter is fitted readings should be taken directly from the readout and if required adjusted using th...

Page 18: ...a duplicate address is detected F indicates a fault present I shows that this sensor has its alarms inhibited under the O H L the v represent the direction of the alarms L is falling and H and O are rising A under the letter s OHLDFI represents a detected state so in this example the sensor would be in high alarm and a fault present Gas val 35 6 represents the value of the gas present at the senso...

Page 19: ... when this reaches 0 the next menu is displayed This timer is 15 seconds approximately and is reset back each time a magnet is near Waiting till timeout is acceptable but this timeout can be speeded up by placing a magnet near to the centre position SPAN is the next part of the menu and gas should be applied to the sensor at this time The left magnet increases the gain and the right magnet reduces...

Page 20: ... Press A to change the address of this sensor if required d Press N to select the number of decimal places to 1 or 2 ie dp 1 or dp 2 e With no gas applied and 4mV measured at test pins TP8 TP9 press Z to zero the gas reading see note f Then apply span gas and press S to enter span mode optain correct mV reading for test gas used by adjusting 20mA pot The displayed reading can be made HIGHER by pre...

Page 21: ...et turns it off With no magnets present the display will return to normal after a few seconds timeout The right magnet allows the CAN address of the sensor to be changed WHEN the ADDRESS menu is displayed with a prompt to remove the magnet and then the display shows the address and that the right magnet will decreases it whilst the left magnet will increase it This is then stored in internal non v...

Page 22: ... shows that this sensor has its alarms inhibited under the O H L the v represent the direction of the alarms L is falling and H and O are rising A under the letter s OHLDFI represents a detected state so in this example the sensor would be in high alarm and a fault present Gas val 35 6 represents the value of the gas present at the sensor head Pressing R on the PC causes a reset to occur Gas type ...

Page 23: ...ight magnet to decrease to achieve a zero reading on the display A timer is displayed on the LCD and when this reaches 0 the next menu is displayed This timer is 15 seconds approximately and is reset back each time a magnet is near Waiting till timeout is acceptable but this timeout can be speeded up by placing a magnet near to the centre position SPAN is the next part of the menu and gas should b...

Page 24: ...Addressable 4 20mA Input 24 Hi Lo 0v 4 20mA 24 Hi Lo 0v 4 20 IN SO SK 4 20 IN SO SK 4 20 IN J10 J10 J10 Command Use A Set CAN address Sets the CAN address G Select gas type Select the gas type from a list Z Zero Press when no gas on sensor to give zero S Span Use when calibration gas applied H and L change reading D Enter calibration date Enter the calibration date Y Toggle auto zero Auto zero is ...

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Page 28: ...3 286 0166 F 0113 287 8178 GDS TECHNOLOGIES LTD FUSION POINT ASH LANE GARFORTH LEEDS LS25 2GA UK www gds technologies co uk This document is not contractual and the equipment specification may be modified at any time without prior notice ...