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Gas Measurement Instruments Gascoseeker 2-500, User Handbook Manual, Page: 13 / 89

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Gas Measurement Instruments Gascoseeker 2-500 User Handbook Manual Download Page 13

1

GASCOSEEKER 2-500 USER HANDBOOK

GENERAL

The G.M.I. Gascoseeker 2-500 has been designed as a
replacement for the successful Gascoseeker Mk 2
instrument for the measurement of % LEL and % Volume
Gas.

This handbook describes the operation and user
maintenance of the instrument.
 The instrument has two basic measuring ranges.

•

% LEL

•

% VOLUME GAS

Summary of Contents for Gascoseeker 2-500

Page 1: ...Gascoseeker 2 500 User Handbook...

Page 2: ...l our publications Your comments can be of great value in helping us to improve our customer publications Please send any comments that you have to our Customer Support Department at GMI INSTRUMENT SE...

Page 3: ...be operational differences between the latest product and this manual This Handbook is an important part of the Gascoseeker 2 500 product Please note the following points It should be kept with the in...

Page 4: ...GMI is removed if the warnings are not observed AREAS OF USE Exposure to certain chemicals can result in a loss of sensitivity of the flammable sensor Where such environments are known or suspected i...

Page 5: ...iii REVISION RECORD Date Pages Description Of Change Issue 1 All New User Handbook 26 08 03 Issue 2 36 Revised to include effect 22 01 15 of CN 6445...

Page 6: ...GASCOSEEKER 2 500 USER HANDBOOK iv...

Page 7: ...ANDBOOK CONTENTS COPYRIGHT i LIABILITY i MODIFICATION NOTICES i SOFTWARE i DISPOSAL ADVICE i SAFETY ii AREAS OF USE ii STORAGE HANDLING AND TRANSIT ii REVISION RECORD iii GENERAL 1 LEL 2 Volume Gas 2...

Page 8: ...F OPERATION 5 LEL Range 5 Gas Range 5 LEL Range Display 6 SENSOR LIFE 8 SPECIFICATION 9 OPERATING PROCEDURE 10 CALIBRATION 11 BEFORE USE 12 MEASURE MODE 13 1 Switch ON 13 2 Ready For Use 15 3 Sample S...

Page 9: ...TOR MESSAGES 22 SAMPLE 22 OFF 22 SAMPLE FAULT 22 ZERO FAULT 22 BAT Flashing 22 BAT FAULT 22 ZERO 22 PROBE 23 SAMPLE LINE 29 LEL GAS MEASUREMENTS 30 Relationship of LEL and Methane in Air 30 LEL Lower...

Page 10: ...arrying Straps 43 WAISTBAND HARNESS 46 INSTRUMENT COTTON FILTER 47 FAULT FINDING 49 Fault Finding 52 INSTRUMENT WILL NOT SWITCH ON 52 INSTRUMENT WILL NOT SWITCH OFF 54 BAT FLAG OPERATES AFTER SHORT TI...

Page 11: ...63 BACKGROUND ILLUMINATION DOES NOT OPERATE 64 INSTRUMENT SWITCHES ON AND IMMEDIATELY SWITCHES OFF 65 INSTRUMENT STARTS CORRECTLY BUT SWITCHES OFF WHEN PUMP OPERATED 67 INSTRUMENT DOES NOT OPERATE ON...

Page 12: ...GASCOSEEKER 2 500 USER HANDBOOK x...

Page 13: ...500 has been designed as a replacement for the successful Gascoseeker Mk 2 instrument for the measurement of LEL and Volume Gas This handbook describes the operation and user maintenance of the instru...

Page 14: ...he operating principle is a catalyst reaction and the instrument measures the heat developed by the combustion of the flammable portion of the atmosphere under test Volume Gas The Volume Gas range ind...

Page 15: ...oltage conditions on the sensing elements controls the pump and range selection and displays the result on a solid state analogue and digital display The microprocessor carries out some housekeeping a...

Page 16: ...everyday use Protection for the display is by toughened glass to prevent impact damage and the display itself is mounted on a shock absorbing mounting to prevent damage The instrument is sealed again...

Page 17: ...0 80 60 40 20 0 LEL Range Display Gas Range On the Gas range the instruments are calibrated for use in METHANE and will give inaccurate results if used in other mixtures In addition the instruments ar...

Page 18: ...ollows in 4 steps SAMPLE 100 80 60 40 20 0 Gas Range Display LEL Range Display On the LEL range the instrument range is displayed in the top right hand corner of the L C D and the digital display will...

Page 19: ...h Instrument Measuring LEL Range The LIQUID CRYSTAL DISPLAY LCD is protected by a toughened glass cover and is weatherproof Backlighting is provided automatically to enable the display to be seen unde...

Page 20: ...on sensitivity or zero Exposure to high concentrations of gas will not damage the elements The sensors are protected from water and dust damage by membrane and cotton filters Provided the instrument...

Page 21: ...e 20 Deg C to 50 Deg C Humidity 20 95 RH non condensing Pressure 950 to 1100 mbar Operating time in excess of 15 hours continuous duty on LR20 batteries at normal ambient temperature Size 180mm x 95mm...

Page 22: ...GASCOSEEKER 2 500 USER HANDBOOK 10 OPERATING PROCEDURE The instrument should always be used as per the operating procedures for the operation being carried out IF IN DOUBT ASK YOUR SUPERVISOR...

Page 23: ...This signifies that the instrument is suitable for use in Methane Natural Gas in air atmospheres Other calibrations are possible but can only be set by competent persons in the instrument workshop Th...

Page 24: ...RO on instrument in clean air Check instrument has correct CALIBRATION for your usage Check instrument has no obvious FAULT condi tions Check CALIBRATION is still valid Check ACCESSORIES Instrument su...

Page 25: ...tch ON OFF MEASURE PUMP ON PUMP OFF ZERO GASCOSEEKER 2 500 Push MEASURE button once to switch ON Instrument performs self check and energises all segments in display Pump also operates for a short per...

Page 26: ...dicates instrument version identifier and software version number V Instrument version Indicates software program version Bar graph indicates battery capacity and background illumination activated 100...

Page 27: ...ady for use indicated by a flashing DIGITAL display 100 80 60 40 20 0 Display flashing 3 Sample Start A single press of the MEASURE button when the pump is stopped starts the pump and draws the sample...

Page 28: ...80 60 40 20 0 4 Sample Finish A single press of the MEASURE button when the pump is running stops the pump and stops sampling OFF MEASURE PUMP ON PUMP OFF ZERO GASCOSEEKER 2 500 Push MEASURE button on...

Page 29: ...ff a To switch off depress MEASURE button twice in rapid succession OFF appears in the display and instrument will shut down To cancel press MEASURE button ONCE OFF MEASURE PUMP ON PUMP OFF ZERO GASCO...

Page 30: ...EEKER 2 500 USER HANDBOOK 18 b Switch OFF is automatic after 30 minutes running OFF appears in the display before automatic switch off To cancel press MEASURE button ONCE 100 80 60 40 20 0 Display fla...

Page 31: ...RO push button once OFF MEASURE PUMP ON PUMP OFF ZERO GASCOSEEKER 2 500 Push ZERO pushbutton once to enter ZERO mode The instrument will enter ZERO mode with similar test sequence to MEASURE mode The...

Page 32: ...program version ZERO but with ZERO flag activated 100 80 60 40 20 0 BAT Background illumination ON Instrument will enter the ZERO mode indicated by ZERO in the status display and zero the instrument a...

Page 33: ...oes not reset the zero and remove the ZERO FAULT or CHECK ZERO flags the instrument should be returned to the service centre for checking The instrument switches OFF automatically from the ZERO mode T...

Page 34: ...the instrument sample flow is incorrect due to sample path blockage or pump failure CHECK ZERO Indication that there may have been a zero shift due to the presence of gas Switch off the instrument and...

Page 35: ...e a short probe with an open end or a long probe with a closed end The filters in the probe should be changed by the operator as required The cotton filter should be changed on a regular basis say onc...

Page 36: ...should not be used without the probe and its filters in place The probe filters help maintain a clean flow path and properly used prevent the ingress of water into the instrument itself Should water...

Page 37: ...DBOOK 100 80 60 40 20 0 Display flashing SAMPLE FAULT 1 Check to ascertain whether water has entered the probe 2 Disconnect probe sample line from instrument 3 Remove probe handle from probe end 4 Rem...

Page 38: ...robe end 6 With the inlet side of filter i e non label side of filter facing downwards tap out any water and ensure the filter is not contaminated with dirt 7 Check sample line is clear of water befor...

Page 39: ...Replace hydrophobic filter ensuring that you replace it in the same way as it was before i e label on filter against label on probe handle 9 Fit new cotton filter into probe handle 10 Reassemble prob...

Page 40: ...ng to ensure that filter is clear 100 80 60 40 20 0 Sample flag operates with MEASURE button and no SAMPLE FAULT flag flashing SAMPLE If SAMPLE FAULT continues to activate fit a new hydrophobic filter...

Page 41: ...of sample line attached The sample line is connected to the right hand inlet nozzle of the instrument The sample line fits easily over the male spigot of the inlet nozzle Make sure that the sample li...

Page 42: ...pper Explosive Limit i e the highest concentration of METHANE NATURAL GAS in air that can cause an explosion Again this figure is gas specific and is approximately 15 Gas for METHANE NATURAL GAS Note...

Page 43: ...is handbook relates to a METHANE NATURAL GAS in Air mixture only as the presence of other gases can have a significant effect on the explosivity of the mixture The relationship between LEL and METHANE...

Page 44: ...icator bar graph to 100 3 Partially used cells will not achieve the battery reset function and will result in less usage from partially used cells Do not mix new and old cells 4 15 hours operational l...

Page 45: ...be typically 1 2 hours life left for operation at normal temperature when alkaline cells are used 8 BAT warning flag is a warning the instrument may continue to be used until it switches off automatic...

Page 46: ...ly observing the and markings on the battery and the instrument ALWAYS Replace the whole set of batteries at one time taking care not to get old and new batteries or batteries of different types mixed...

Page 47: ...ecure when replacing batteries and before instrument use Spare batteries can be kept in the carrying case for field replacement NEVER Use or handle batteries which are physically damaged leaking or he...

Page 48: ...ou can only use the following approved Alkaline Batteries Duracell Industrial ID1300 Size D LR20 Duracell Procell MN1300 Size D LR20 Ever Ready Energiser Size D LR20 The Gascoseeker 2 500 contains fou...

Page 49: ...37 GASCOSEEKER 2 500 USER HANDBOOK 4 Remove battery cover...

Page 50: ...GASCOSEEKER 2 500 USER HANDBOOK 38 5 Remove old batteries 6 Check battery compartment for damage to spring contacts or corrosion on springs...

Page 51: ...r 4 batteries with new units Observe correct polarity with indicator marked in battery compartment base 8 Replace base plate and fasten base screws 9 Check that instrument switches ON battery indicato...

Page 52: ...utlet It will not connect to the inlet Ensure that the bulb has an adaptor fitted The bulb should be checked periodically to ensure that it is functioning correctly Place finger over inlet hole in bul...

Page 53: ...Absence of SAMPLE flag on display 3 Flashing SAMPLE FAULT on display If these cannot be cleared by New batteries Switching instrument OFF and ON again Operation of MEASURE button to operate pump Check...

Page 54: ...not be leak free however this should not affect instrument performance Aspirate sample through instrument as desired Remember that display may be flashing since this is an indication of pump not runni...

Page 55: ...der pad and D shaped loops for attachment of a waistband harness where desired The waistband harness is not supplied with the instrument as standard but is available as an accessory To affix to instru...

Page 56: ...GASCOSEEKER 2 500 USER HANDBOOK 44 Strap can be adjusted to length by means of buckle Pull strap upwards until strap clip locates firmly on stainless steel boss with sharp click...

Page 57: ...45 GASCOSEEKER 2 500 USER HANDBOOK Excess strap length can be clipped into open slot on top of strap clips...

Page 58: ...GASCOSEEKER 2 500 USER HANDBOOK 46 WAISTBAND HARNESS The waistband harness is supplied as an accessory The waistband harness is attached to the instrument using the D clips on the shoulder harness...

Page 59: ...where the instrument is to be used without the probe handle provision is made within the instrument to incorporate a separate cotton filter This should not be used with a cotton filter in the probe h...

Page 60: ...cing The cotton filter in instrument should be removed after use This filter should not be used with the normal probe since it already incorporates a cotton filter and two filters in the line can affe...

Page 61: ...checking and if necessary repair There are a number of faults which can be checked and rectified by the user before sending to the instrument workshop Instrument will not switch ON SEE PAGE 52 NO YES...

Page 62: ...indicate 100 after fitting new batteries SEE PAGE 58 NO YES Does the SAMPLE FAULT keep operating SEE PAGE 59 NO YES Does the ZERO FAULT flag operate SEE PAGE 61 NO YES Does the CHECK ZERO flag operate...

Page 63: ...tart correctly but switches OFF when pump is operated NO Does instrument not operate on Depot Checker SEE PAGE 68 NO YES SEE PAGE 67 YES Is the gas response slow SEE PAGE 70 NO YES Does the instrument...

Page 64: ...in the instrument ACTION FIT BATTERIES ARE BATTERIES OPERATIONAL Check and make sure that only fresh new alkaline batteries are used Batteries which have been used in other equipment should not be us...

Page 65: ...loth do not use solvents contact cleaners grease etc If in doubt return instrument to workshop for checking If battery has leaked causing contamination of contacts instrument should be returned to wor...

Page 66: ...ked or is connected to an alarm unit In the communications mode the 30 minute time is inhibited and the instrument will continue to run until switched off manually or until the batteries are exhausted...

Page 67: ...although the batteries will operate below freezing their operating time can be substantially reduced Keep spare batteries at room temperature for a few hours if you are using the instrument below free...

Page 68: ...FOUR BATTERIES OF THE SAME MAKE AND TYPE All four batteries should be replaced at one time with new cells of the same make and type DO NOT MIX BATTERY TYPES ACTION REPLACE ALL FOUR CELLS WITH NEW LR2...

Page 69: ...s ACTION CHECK WHEN BATTERIES ARE CHANGED IS INSTRUMENT SWITCHED OFF MANUALLY OR LEFT TO SWITCH OFF AUTOMATlCALLY AFTER USE The instrument switches off automatically after 30 minutes running to conser...

Page 70: ...use the instrument to malfunction and may in themselves be dangerous in gaseous atmospheres ACTION REPLACE ALL CELLS WITH FOUR NEW LR20 ALKALINE BATTERIES HAVE BATTERIES BEEN KEPT AT LOW TEMPERATURE F...

Page 71: ...instrument ACTION ENSURE THAT LR20 ALKALINE BATTERIES ARE FITTED SAMPLE FAULT KEEPS OPERATING IS THERE WATER IN PROBE OR SAMPLE LINE When the filters in the probe are blocked with water the SAMPLE FA...

Page 72: ...TACHED It may be necessary to switch the instrument OFF and ON again to enable the flow sensor to initiate the test conditions at start up which include the back pressure of the sample line and probe...

Page 73: ...mp causing a SAMPLE FAULT ACTION CHECK OPERATION AT AMBIENT TEMPERATURE REPLACE BATTERIES WITH ONES KEPT AT AMBIENT CHECK FILTERS AND REPLACE AS NECESSARY ZERO FAULT FLAG OPERATES HAS INSTRUMENT BEEN...

Page 74: ...false zero in the zero check sequence ACTION CHECK FILTERS FOR CONTAMINATION CHANGE IF NECESSARY REMOVE SAMPLE LINE AND PROBE SWITCH INSTRUMENT OFF INITIATE A ZERO SEQUENCE IN FRESH AIR HAS INSTRUMENT...

Page 75: ...WAS INSTRUMENT LAST ZEROED The instrument should be zeroed at regular intervals e g once per day or before use if it has not been used for several days ACTION INITIATE ZERO SEQUENCE IN FRESH AIR HAS...

Page 76: ...NTLY LOW The background illumination will only be initiated when the ambient lighting is sufficiently low that the scale cannot be read ACTION ENSURE THAT AMBIENT LIGHT IS LOW ENOUGH IN AREA OF INFRAR...

Page 77: ...the BAT FAULT flag ACTION REPLACE BATTERIES WITH NEW LR20 ALKALINE BATTERIES ARE BATTERIES OF THE CORRECT TYPE Only good quality alkaline batteries of the LR20 type should be used do not mix types of...

Page 78: ...and automatic shutdown ACTION CHECK FILTERS AND SAMPLE LINE ARE CLEAR REPLACE BATTERIES IF NECESSARY DOES INSTRUMENT COMPLETE ZERO SEQUENCE If the instrument has a ZERO FAULT above a certain level or...

Page 79: ...TERS CLEAR Low batteries used in low temperatures with a blocked sample line or filters may reduce battery voltage below the automatic switch off point thus causing the instrument to switch OFF ACTION...

Page 80: ...on the DEPOT CHECKER If other instruments operate correctly on checker then DEPOT CHECKER is probably correct ACTION TRY OTHER INSTRUMENT ON CHECKER IF SATISFACTORY WAIT 5 MINUTES AND TRY AGAIN REPORT...

Page 81: ...ND INFRARED LINK WITH DRY CLOTH ENSURING ANY DEBRIS IS REMOVED FROM OPTICAL RECESS ON LINK DO NOT WIPE MATERIAL INTO RECESS RATHER BLOW IT OUT HAVE YOU FOLLOWED THE DEPOT CHECKER INSTRUCTIONS Instrume...

Page 82: ...TRUMENT FOR THE GAS YOU ARE USING IF IN DOUBT ASK SUPERVISOR ARE THE BAT OR BAT FAULT FLAGS ACTIVATED If the batteries are low the pump flow rate may be reduced and hence the response time reduced ACT...

Page 83: ...E BATTERIES WITH NEW LR20 CELLS WHICH HAVE BEEN KEPT AT AMBIENT TEMPERATURE INSTRUMENT DOES NOT CHANGE RANGE DOES THE INSTRUMENT COMPLETE THE MEASURE AND ZERO START UP SEQUENCES CORRECTLY If the instr...

Page 84: ...ACTION SWITCH OFF INITIATE ZERO SEQUENCE IN FRESH AIR SWITCH ON USING MEASURE BUTTON CHECK FOR RANGE CHANGE AND RETURN TO SUPERVISOR IS THE INSTRUMENT BEING USED TO MEASURE METHANE Since the LE L and...

Page 85: ...ot be able to correct and may give inaccurate readings Thus the display is blanked to prevent incorrect use Normally a ZERO FAULT flag would also be initiated ACTION SWITCH OFF INITIATE ZERO SEQUENCE...

Page 86: ...GASCOSEEKER 2 500 USER HANDBOOK 74...

Page 87: ...APH ON BAT TERY TEST DOES NOT INDICATE 100 A 58 BAT Flashing 22 BAT FAULT 22 BAT FLAG OPERATES AFTER SHORT TIME 55 BATTERIES DO NOT GIVE LONG USE 56 BATTERY LIFE 32 Battery Replacement 36 Battery Safe...

Page 88: ...OT CHANGE RANGE 71 INSTRUMENT DOES NOT OPERATE ON DEPOT CHECKER 68 INSTRUMENT STARTS CORRECTLY BUT SWITCHES OFF WHEN 67 INSTRUMENT SWITCHES ON AND IMMEDIATELY SWITCHES OFF 65 INSTRUMENT WILL NOT SWITC...

Page 89: ...t Battery 36 REVISION RECORD iii S SAFETY ii SAMPLE 22 SAMPLE FAULT 22 SAMPLE FAULT KEEPS OPERATING 59 Sample Finish 16 SAMPLE LINE 29 Sample Start 15 SENSOR LIFE 8 SOFTWARE i SPECIFICATION 9 STORAGE...

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