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49391

Revision 3

Gasurveyor 700

USER MANUAL

Figure 81: Bump Test - Purge

Note: The following gas concentrations are suggested if no other requirements are
specified by local regulations and/or internal company procedures:

•

Flammable ppm

•

Flammable %LEL

•

Flammable Volume

•

Oxygen

•

Carbon Monoxide (CO)

•

Hydrogen Sulphide (H

4550ppm
50% LEL
100% Volume
18% Volume
500ppm
50ppm

7.3. Automatic Bump Test

For details on automatic bump testing using the GDUnet station, please refer to the following
documents:

•

GDUnet User Handbook

- part no. 14765

•

FlexiCal Plus User Handbook

- part no. 99551

Figure 82: GDUnet Station

Содержание Gasurveyor 700

Страница 1: ...User Manual 49391 Revision 3 Gasurveyor 700 IR gas detector with Natural Gas discrimination ...

Страница 2: ...r use only with the Gasurveyor 700 Portable Gas Monitor or the monitor LIABILITY Every care has been taken in the preparation of this user guide but the Company does not accept any responsibility for errors or omissions and their consequences Information in this user guide is subject to change without notice This user manual does not constitute a specification or basis for a contract Piped natural...

Страница 3: ... Sulphur Environmental factors may affect sensor readings This includes changes in pressure humidity and temperature Note that both pressure and humidity changes can also affect the amount of oxygen present in the atmosphere Do not use the monitor in a potentially hazardous atmospheres containing greater than 21 oxygen WARNING ANY RAPID UPSCALE READING FOLLOWED BY A DECLINING OR ERRATIC READING MA...

Страница 4: ...3 2 6 Display 14 2 6 1 Soft Keys 14 2 6 2 Status Bar 15 3 Operation 16 3 1 Operating Procedure 16 3 2 Quick Configuration Display 16 3 3 Switching the Monitor ON Warm up Sequence 16 3 3 1 Monitor Identification 17 3 3 2 Date Time 17 3 3 3 Bump Due Date 17 3 3 4 Calibration and Service Due Dates 18 3 3 5 Soundness Test 19 3 3 6 Alarm Levels 20 3 3 7 Sensors Zero Check 21 3 4 Switching the Monitor O...

Страница 5: ...s 31 4 4 2 Features 31 4 4 3 Display 32 4 4 4 Soft keys Functions 32 4 4 5 Logging 33 4 5 Pipeline Gas Test PGT 33 5 Alarms 35 5 1 Instantaneous Gas Alarms 35 5 2 Time averaged Toxic Gas Alarms 36 5 3 Ticker Geiger Gas Alarm 36 5 4 Available Gas Alarms 36 5 5 Gas Alarms Examples 36 5 6 Gas Alarm Options 37 5 6 1 Alarm Intensity 37 5 6 2 Latching Non Latching 38 5 6 3 Muting 38 5 7 Warnings Fault A...

Страница 6: ...lter Replacement 46 6 5 Screen Contrast Adjustment 47 7 Bump Test 48 7 1 Manual Bump Test LEL only 48 7 2 Manual Bump Test all ranges 50 7 3 Automatic Bump Test 51 8 Calibration 52 8 1 Calibration Validity 52 8 2 Field Calibration 52 8 3 Manual Calibration 55 8 3 Automatic Calibration 55 9 Accessories 56 9 1 Consumables 56 9 2 Accessories 56 9 3 Software 56 10 Monitor Specifications 57 1 1 Technic...

Страница 7: ...49391 Revision 3 7 Gasurveyor 700 USER MANUAL Page intentionally left blank ...

Страница 8: ...r must be regularly serviced and calibrated by fully trained personnel in a safe area Only Teledyne GMI replacement parts should be used Substitution of components may impair intrinsic safety If the monitor detects gas follow your own organization s procedures and operational guidelines Any right of claim relating to product liability or consequential damage to any third party against Teledyne GMI...

Страница 9: ...ère testez la réaction de l appareil en utilisant une concentration connue en méthane correspondant à 25 50 de la lecture à fond d échelle La précision doit se situer entre 0 et 20 de la valeur réelle La précision peut se corriger en étalonnant l appareil voir Chapitre CALIBRATION CAUTION Any rapid up scale readings followed by a declining or erratic reading may indicate a gas concentration beyond...

Страница 10: ...IECEx Ex db ia IIC T4 Gb 20o C Ta 50o C Ex db ia IIB T3 Gb 20o C Ta 50o C IECEx SIR 15 0105X CSA Class I Div 1 Groups A B C and D T4 Class I Zone 1 AEx db ia IIC T4 Gb Ex db ia IIC T4 Gb Class I Div 1 Groups C and D T3 Class I Zone 1 AEx db ia IIB T3 Gb Ex db ia IIB T3 Gb China Ex d ia IIC T4 Gb Ex d ia IIB T3 Gb when fitted with semiconductor PPM sensor GB 3836 1 2010 GB 3836 2 2010 GB 3836 4 201...

Страница 11: ...trial or X Power DURACELL Industrial or Procell PANASONIC Evolta CAUTION Remove batteries if the monitor will be stored for longer than 3 months 1 2 4 Equipment Parameters GS700 Instrument Um 6 78V Rechargeable Battery part number 49221 Temperature Range 20o C Ta 50o C GS700 Charger Um 250V Uo 6 78V Temperature Range 20o C Ta 44o C ...

Страница 12: ... large display 2 2 Key Features Infrared Technology Natural gas discrimination GPS optional Bluetooth and IrDA communication Leak detection from PPM to Volume gas Flexible configuration gas ranges modes of operation Compatible with the GDUnet Teledyne GMI Auto Calibration System 2 3 Monitor Ranges The following ranges are available in the GS700 0 10 000 ppm Flammable 0 100 LEL Flammable 0 100 VOL ...

Страница 13: ...nitoring in potentially hazardous areas Purge Used in gas and air purging applications Search Used to quickly find small leaks using a semiconductor sensor and fast pump Note Pipeline Gas Test is an optional feature When configured it can be active in ALL modes of operation except for CSM 2 5 Monitor Construction Figure 1 GS700 Right View Figure 2 GS700 Left View Harness Clip Semiconductor Probe C...

Страница 14: ...ut this user guide to illustrate the main display 2 6 1 Soft Keys The GS700 has 4 soft keys performing different operations depending on mode and function Figure 5 Soft keys If no on screen label is available the soft keys will be referred to as B1 B2 B3 and B4 as shown in Figure 5 Soft Keys Visual Alarm Visual Alarm Soft Keys Display Soft Key Options Status Bar Gas Readings Information Window 1 G...

Страница 15: ...cation Solid the location of the monitor has been found Pump The pump is operating at high speed Geiger audible visual alarms off The audible and visual alarms are switched off when using the Geiger feature in Search mode Geiger audible alarm on visual alarm off The audible alarm is active when using the Geiger feature in Search mode Geiger audible alarm off visual alarm on Visual alarms are activ...

Страница 16: ...ges are operational There are no fault indications 3 2 Quick Configuration Display This feature allows configuration information to be viewed without fully switching the monitor ON see Figure 7 Quick Configuration Display With the monitor OFF press B2 for one second The monitor will display Flammable gas calibration List of sensors fitted Due dates service calibration bump Is GPS enabled Figure 7 ...

Страница 17: ...igure 10 Warm up Due Dates Verify they are correct as they are used with datalogging Figure 10 Warm up Due Dates 3 3 3 Bump Due Date Bump Due date is displayed below the Time Date as shown in Figure 10 Warm up Due Dates The interval can be set from 1 to 30 days This feature can be configured to operate in four ways 1 Bump Due disabled no date is displayed The monitor does not require a valid Bump ...

Страница 18: ...ibration Due date is automatically updated when all ranges of the monitor are successfully calibrated The monitor has five options to alert the user when calibration or service is overdue 1 Calibration Service Due disabled no date is displayed The monitor does not require a valid calibration or service to operate 2 Calibration Service Due enabled if overdue monitor is switched off 3 Calibration Se...

Страница 19: ...A soundness test verifies the monitor and probe are not leaking Note Soundness Test is an optional feature that can be requested during the monitor procurement If enabled the check can be set to operate once a day or with each power up When the Soundness Test screen is displayed as shown in Figure 14 Soundness Test block the gas inlet sample path for 5 seconds Figure 14 Soundness Test If the monit...

Страница 20: ...ponsibility of the user to ensure that the alarm set points are appropriate for the safe operation and legal requirements of the country industry in which the instrument is being used Note Alarm set points are configured during the monitor procurement 3 3 7 Sensors Zero Check At the end of warm up each sensor is zeroed as shown in Figure 18 Warm up Sensor check Figure 18 Warm up Sensor check A suc...

Страница 21: ...ult is detected the monitor should be restarted in fresh air If the fault persists recalibrate the monitor If that fails return the monitor to a Teledyne GMI approved service center Note If a Zero Fault exists the monitor can still be used to detect and alarm on all the other ranges fitted 3 4 Switching the monitor OFF To switch off the monitor press and hold B1 for 3 seconds A countdown from 3 to...

Страница 22: ...n be available in all modes of operation except for CSM Note Mode names and their on screen sequence can be modified during the monitor procurement To change the mode of operation press the Mode button This will open the mode selection screen as shown in Figure 22 Mode Selection Figure 22 Mode Selection Once the mode is selected its short name will be displayed in the status bar as shown in Figure...

Страница 23: ...nt 4 1 1 Available Ranges 0 10 000 ppm Methane Semiconductor sensor 0 10 000 ppm Flammable IR sensor 0 100 LEL Flammable 0 100 Volume Flammable 0 25 Volume Oxygen O2 0 1 000 ppm Carbon Monoxide CO 0 100 ppm Hydrogen Sulphide H2 S 4 1 2 Features Gas Leak Outdoors GLO Indoors GLI modes features Barhole testing GLO mode only Audible visual gas alarms optional Pump control Manual automatic datalogging...

Страница 24: ...de Refer to Section 4 1 6 Barhole Testing for more details PGT Enter Pipeline Gas Test PGT mode Refer to Section 4 5 Pipeline Gas Test PGT for more details Log Perform a manual log of all the monitor readings Range Change the gas range visible on the main section of the display as shown in Figure 26 Change Range Figure 26 Change Range 1 CAUTION Always zero the monitor in fresh air 4 1 5 Logging By...

Страница 25: ... pump control are disabled during a barhole test To perform barhole testing 1 Ensure mode is Gas Leak Outdoor GLO 2 Press B H button as shown in Figure 27 B H button Figure 27 B H button 3 Press Yes button to start new series of readings Press No button to continue with a previous series Figure 28 Barhole Screen 1 Yes button clears the current barhole series and starts new one with Barhole number ...

Страница 26: ...le test is initiated a timer will commence and the gas reading will be displayed as shown in Figure 31 Barhole Screen 4 After sampling is completed the peak and sustained readings are displayed as shown in Figure 32 Barhole Screen 5 Note Barhole sampling time can be set during the monitor procurement from 10s to 60s By default this value is set to 15 seconds Figure 31 Barhole Screen 4 Test can be ...

Страница 27: ...ill be displayed with the next available barhole number as shown in Figure 30 Barhole Screen 3 To repeat overwrite a barhole test 1 Navigate to the barhole test you wish to repeat using and buttons 2 Press Start button to initiate the test 3 An overwrite confirmation screen will appear as shown in Figure 34 Barhole Overwrite Press Yes button to continue with the barhole test or No to return to pre...

Страница 28: ...nce signal Gas readings alarm set points viewer 4 2 3 Display Figure 35 Typical Confined Space Monitor CSM display 4 2 4 Soft keys Functions Button Action Log Perform a manual recording of all the monitor readings View Open gas readings alarm set points viewer Refer to Section 4 2 6 Gas Readings Alarm Set points Viewer for more details Note For safety reasons the monitor cannot be zeroed in the CS...

Страница 29: ...s Min Current STEL exposure STEL Current LTEL exposure LTEL HiHi alarm set points HiHi Alm Hi Lo alarm set points Hi Lo Alm LoLo alarm set points LoLo Alm STEL alarm set points STEL Alm LTEL alarm set points LTEL Alm Live readings CSM Figure 36 CSM Gas Readings Alarm Set points Viewer Press the Clear button to re sets the Maximum and Minimum values back to 0 3 Press Live button to return to normal...

Страница 30: ...Display Figure 37 Typical Purge display 4 3 4 Soft keys Functions Button Action Pump Switch the pump ON OFF Monitor functionality is disabled when the pump is OFF as shown in Figure 38 Pump OFF Figure 38 Pump OFF Zero1 Zero all gas ranges PGT Enter Pipeline Gas Test PGT mode Refer to Section 4 5 Pipeline Gas Test PGT for more details Log Perform a manual recording of all the monitor readings ...

Страница 31: ...very minute is active for all ranges 4 4 Search In this mode the GS700 is used for rapid leak detection Note Search mode is only available for monitors equipped with the PPM Flammable range 4 4 1 Available Ranges 0 10 000 ppm Methane Semiconductor sensor 0 10 000 ppm Flammable IR sensor 0 100 LEL Flammable 4 4 2 Features Search mode features Audible Visual PPM Ticker Geiger alarm Fast pump Manual ...

Страница 32: ...igure 41 Pump OFF Figure 41 Pump OFF A pump icon appears on the status bar to indicate high speed pump operation as shown in Figure 42 High Speed Pump Figure 42 High Speed Pump Zero1 Zero all gas ranges PGT Enter Pipeline Gas Test PGT mode Refer to Section 4 5 Pipeline Gas Test PGT for more details Log Perform a manual recording of all the monitor readings A V Change the operation of the Ticker Ge...

Страница 33: ...inute warm up after powering up the monitor During that time the PGT will flash and the feature won t be accessible Note This chapter describes the Pipeline Gas Test fuctionality for instrument firmware v1 30 or later Please see Appenix A Pipeline Gas Test pre firmware v1 30 for details on how to use PGT on older GS700 units To access the PGT and perform the test 1 From the normal operating displa...

Страница 34: ...r hydrocarbons providing The measured sample is 1 Volume Gas The sample source contains a minimum of 2 Ethane Decision point will improve with increased concentration of heavier hydrocarbons in measured mixture e g 5 of Ethane will bring the descision point to 0 5 Vol 4 Continue the survey until the countdown is complete or press the Stop button 5 After sampling is completed the Peak reading is di...

Страница 35: ...alarm type Visual 360 LED bar and top cover LED s will flash red flash will differ depending on alarm type Display backlight turns red and alarm flags are displayed Figure 46 Alarm Indicators 5 1 Instantaneous Gas Alarms When an alarm set point has been reached the audible and visual alarms will activate to alert the user Alarms only operate once the monitor warm up is complete All gas alarms are ...

Страница 36: ...ssentially makes the monitor single user applicable Note Because readings are averaged it is possible to get a live reading of zero and have a LTEL or STEL alarm active 5 3 Ticker Geiger Gas Alarm An audible and visual Geiger alarm enabled in the PPM Flammable range provides indication of increasing or decreasing gas concentration via a variable rate sounder and LED flashes User can change the ope...

Страница 37: ...In Gas Leak Indoors Gas Leak Outdoors and Purge modes user can choose different intensities for the instantaneous alarms This is selected during the monitor procurement Available options Low intensity alarm flags Medium intensity alarm flags red display backlight top cover LEDs High intensity alarm flags red display backlight top cover LEDs 360 LED bar audible alarm ...

Страница 38: ...d alarm flag will remain active After 60 seconds the audible alarm will reactivate When the audible alarm is muted and gas levels fall below the alarm set points Latching alarm the visual displayed alarms can be cleared by pressing the Ack button Non latching alarm the visual displayed alarms clear automatically 5 7 Warnings Fault Alarms 5 7 1 Confidence Signal The confidence signal is an audible ...

Страница 39: ...PM sensor is exposed to a gas reading above 10 000 ppm and no autoranging for the flammable range is enabled EEEE flag will appear as shown in Figure 53 Over range in GLO Figure 53 Over range in GLO 5 7 4 Zero Fault If the monitor is switched on in gas and unable to zero all sensors correctly A flashing Zero alarm flag alternates on the display with the gas range The audible alarm sounds and the r...

Страница 40: ... screen as shown in Figure 55 Sample Fault Audible alarm activates Top cover LED flash Red display backlight activates Figure 55 Sample Fault Check sample line filter or probe for blockage Clear blockage then restart pump by pressing the Pump button Note In Confined Space Monitor CSM mode once the blockage is cleared the pump will restart automatically ...

Страница 41: ...MANUFACTURERS WARNING DO NOT USE RECHARGEABLE BATTERIES WARNING TO PREVENT IGNITION OF FLAMMABLE OR COMBUSTIBLE ATMOSPHERES ALWAYS REMOVE BATTERIES BEFORE SERVICING THE MONITOR WARNING TO PREVENT IGNITION OF FLAMMABLE OR COMBUSTIBLE ATMOSPHERES READ UNDERSTAND AND ADHERE TO THE MANUFACTURER S MAINTENANCE PROCEDURES 1 Using the 4mm hex driver supplied loosen the 2 base screws Figure 56 Battery Cove...

Страница 42: ... Battery Compartment 6 Replace battery cover and fasten the base screws 6 2 Recharging the Battery Pack The Lithium Ion battery pack is recharged using a dedicated Teledyne GMI charger The battery pack can be charged fitted to the monitor or separately Figure 59 Monitor Charger WARNING BATTERY PACKS MUST BE CHARGED ONLY IN A LOCATION KNOWN TO BE NON HAZARDOUS WARNING ONLY USE TELEDYNE GMI APPROVED...

Страница 43: ...tor into the charging cradle as shown in Figure 60 Monitor Charging Figure 60 Monitor Charging Note The alignment position of the monitor is moulded on the surface of the charger cradle 3 The charging icon on the monitor will flash until fully charged Figure 61 Charging Icon 4 Once charged remove the monitor from charger as shown in Figure 62 Monitor Charging Figure 63 Monitor Charging ...

Страница 44: ... battery pack Figure 65 Removed Battery Pack 3 Ensure the battery charger is switched ON indicated by the green power LED 4 Place the battery pack into the charging cradle as shown in Figure 66 Battery Pack Charging Figure 66 Battery Pack Charging 5 The orange LED on the battery pack indicates the battery pack is charging as shown in Figure 67 Battery Pack LED When the LED switches off the battery...

Страница 45: ...oth over the outer casing to remove any dirt and grime In extreme cases a mild soap solution may be used with a non abrasive cloth to remove stubborn marks Caution Do not use agents containing silicon or solvent to clean the monitor as these may damage the flammable gas sensor Caution Do not use abrasive materials or strong volatile chemical solutions as these could damage the impact resistant cas...

Страница 46: ...nd discard 3 Remove the hydrophobic filter 4 Clean the probe handle to make sure it s free from dirt and water 5 Fit a new cotton particulate filter 6 Fit the new hydrophobic filter The filter s yellow label should face the yellow label on the probe handle 7 Reassemble the probe handle Hydrophobic Filter Cotton Particulate Filter Probe Handle Assembly Figure 69 Probe Handle Assembly 6 4 2 Inlet No...

Страница 47: ...ut the inlet nozzle installed 6 5 Screen Contrast Adjustment 1 Press and hold B1 for one second to switch the monitor ON 2 Press B4 immediately after the splash screen appears 3 Contrast adjustment menu will appear after the initial monitor warm up as shown in Figure 72 Contrast Adjustment Menu Figure 72 Contrast Adjustment Menu Press Lighter button to reduce the contrast Press Darker button to in...

Страница 48: ... station standalone PC or IMS modes 7 1 Manual Bump Test LEL only Note LEL only Bump Test is an optional feature that can be enabled during the monitor procurement Note LEL only Bump Test limits can be adjusted during the monitor procurement default settings are 40 to 60 LEL It is the user s responsibility to ensure these are correct To perform LEL only Bump Test 1 Switch instrument on using B4 LE...

Страница 49: ... countdown timer automatically resets to 5 seconds and Pass appear on the screen as shown in Figure 76 LEL Bump Gas Detected Keep the gas connected for the full 5 seconds Figure 76 LEL Bump Gas Detected If the gas concentration is within the set limits after the 5 second countdown the bump test is successful and Purge to air appears on the display as shown in Figure 77 LEL Bump Pass Figure 77 LEL ...

Страница 50: ...anual Bump Test all ranges 7 2 Manual Bump Test all ranges To perform manual Bump Test 1 Switch monitor on and allow warm up to complete Select an operating mode that displays all instrument ranges Validate all readings on screen are indicating 0 or 20 9 for O2 2 Connect the calibration gas to the monitor inlet as shown in Figure 79 Connect Calibration Gas Figure 79 Connect Calibration Gas Note Ca...

Страница 51: ...ernal company procedures Flammable ppm Flammable LEL Flammable Volume Oxygen Carbon Monoxide CO Hydrogen Sulphide H2 S 4550ppm 50 LEL 100 Volume 18 Volume 500ppm 50ppm 7 3 Automatic Bump Test For details on automatic bump testing using the GDUnet station please refer to the following documents GDUnet User Handbook part no 14765 FlexiCal Plus User Handbook part no 99551 Figure 82 GDUnet Station ...

Страница 52: ...tion of the product is unknown to Teledyne GMI Individual codes of practice may dictate shorter periods Regular checking establishes a pattern of reliability and enables the calibration check to be modified in line with operational experience The higher the risk the more frequently the calibration should be checked 8 2 Field Calibration Note Field Calibration is an optional feature that can be ena...

Страница 53: ... to the monitor then press Zero button Figure 85 Field Calibration Zero 5 Once zeroing is complete the monitor will display the main field calibration screen as shown in Figure 86 Field Calibration By default the first gas range displayed is Volume Flammable Press Range button to change the displayed range Figure 86 Field Calibration 6 Connect the calibration gas to the monitor inlet as shown in F...

Страница 54: ...ing corresponds to the concentration of calibration gas disconnect the tubing from the monitor 9 Press the Range button to change range and calibrate another gas Repeat steps 4 to 9 for each range 10 Press the End button after all required ranges have been calibrated 1 1 Save screen will appear as shown in Figure 90 Field Calibration Save Figure 90 Field Calibration Save Press Yes button to save t...

Страница 55: ...bration requires the user to control the delivery of gas during calibration For details on manual calibrating of the monitor using the FlexiCal Plus software please refer to the FlexiCal Plus User Handbook part no 99551 8 4 Automatic Calibration For details on automatic calibration of the monitor using the GDUnet station please refer to the following documents GDUnet User Handbook part no 14765 Fl...

Страница 56: ...ey Probe Assembly including Swan Neck Probe 42200 Semiconductor Flexi Probe Assembly GS700 must be fitted with a semiconductor probe connector 12481 Probe Handle Assembly 49221 Rechargeable Battery Pack 49460 Charger Cradle including Universal PSU 49300 Car Charging Lead for the Carger Cradle 12451 Hex Driver 14750X GDUnet station 6mm fittings 14750XQ GDUnet station 1 4in fittings 991 18 On Demand...

Страница 57: ...s Temperature Limits 20 C to 50 C 4 F to 122 F Humidity Limits 0 90 R H non condensing Protection Rating Polycarbonate ABS case with TPE over moulding protected to IP55 Sampling System Integral pump with flow fail sensor Sample path is protected by a hydrophobic and cotton filter Flow rate 0 5 l min with no restriction Response times increase 2 second per metre of tubing used Maximum tubing length...

Страница 58: ...ll Instrument performance complies to the relevant sections of the following standards Flammable BS EN IEC 60079 29 1 Flammable CSA 22 2 No 152 and ANSI ISA 12 13 01 Toxic BS EN 45544 Oxygen BS EN 50104 China CPA performance standard Note All values are typical at normal temperature and pressure Humidity is between 0 and 90 non condensing User must also ensure that pressure changes at the inlet an...

Страница 59: ...ouble free service Contact your regional technical support if you have technical questions need support or if you need to return a product Details can be found at www teledynegasandflamedetection com Note When returning a product contact Technical Support to obtain a Return Material Authorization RMA number prior to shipping ...

Страница 60: ...ackground of ALL modes of operation except for CSM When sampling the GS700 automatically discriminates and displays the results on the main screen as shown in Figure A1 PGT Sampling Methane and Figure A2 PGT Sampling Other Hydrocarbons Figure A1 PGT Sampling Methane Figure A2 PGT Sampling Other Hydrocarbons Note GS700 will indicate if the gas sample is Methane or other hydrocarbons providing The m...

Страница 61: ...49391 Revision 3 61 Gasurveyor 700 USER MANUAL Page intentionally left blank ...

Страница 62: ...Cypress TX 77249 USA Tel 1 713 559 9200 EMEA Inchinnan Business Park Renfrew PA4 9RG Scotland UK Tel 44 0 141 812 321 1 ASIA PACIFIC 750C Chai Chee Road 03 08 Viva Business Park Singapore 469003 Tel 65 84282741 www teledynegasandflamedetection com ...

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