Home

Manual (non-certified version)

1. 38 1200 Punning Ne DRT CHEERS 38 13 DETECTOR CONFIGURATION Vau ESSE n EN eS VES e sux Use SS 39 X eligen tees 39 mc ___ gt ee 39 13 1 2 Set Measurement Full Scale AEN e ko ERIS 40 VER MEE 20 gah BY 0 lt aan er ore 40 ILa DOCG SOC 5 51 5 41 iMi P We cl T 41 13 2 1 Making Alarm Configuration Changes Alarm 1 shown sessi 42 AI TOLVE E 42 192 4 Vac oe toti E E E 42 L24 AGI TA E 43 13 2 5 Alarm 1 Normal 5 SOE TOROS ORA 43 gt ee 43 13 2 7 Current Settings SCION secs 44 13 3 DIGITAL DATA CONFIGURATION Mt CC X X A 44 19 3 1 FART SCEUD MONS VEON E 44 13 3 2 Turning HART Communications On OF 44 45
2. AL PASS CODE Q gt INFORMATION SET QUICK NAV 4 E A SN b CALIBRATION SENSOR ALARMS DATA SYSTEM ey AUTOMAN 3 A E A ALARM A ALARM 2 A 7EROCAL SENSOR SETUP i CURRENT 4 9 CURRENT gt tpm em gt hee SETTINGS 4 n 1 GUARD 3 AUTO SPAN i4 3 SPANCAL TRIP LEVEL TRIP LEVEL MANUAL SPAN DRT i i FULLSCALE HYSTERESIS HYSTERESIS al MT 3 TRIP SEES 3 DIRECTION DIRECTION A CAL20m i GAS NORMAL STATE NORMAL STATE LATCHING LATCHING 1 a M MK 63 GASTECH AUSTRALIA 25 APPENDIX 25 1 Performance Specifications 25 1 1 General Specifications Nm Limits Parameter Description Conditions Min Max Units GS 1 Measurement Techniques Electro Chemical Cell Infra Red GS 2 Target Gas Depends upon model see table 2 gas types and ranges GS 3 Full Scale Ranges Depends upon model see table 2 gas types and ranges GS 4 Measurement Accuracy Refer to Sensor Performance tables GS 5 Maximum Loop Current Under any condition of operation or fault 30 mA GS 6 Minimum Supply Voltage at 20mA Minimum operatin
3. cece dan aaa Ao ced ane cade pave aw cee cae conn T Med 24 INSTALLATION VERIFIGATION a cos ios avs tue 24 10 2 JPERFORMANCE CHECKS bacino ie wa bandos Debatte obo e onde di dta wa dene Ao uM eo LIAE 25 10 3 EQUIPMENT REQUIRED FOR PERFORMANCE CHECKS cccececsececccccccccccenceccnceceacecenceceacsceacecsaceseaceceaceceaseceaceneas 25 10 4 JBUMP TEST CONDITIONS ERE E dan eu euin GE uen ados penso CN vod CUP 26 10 5 IBUMP TEST PROCEDURE zt oet del rode totae vi ve e even Wachee ates pe onset ud te oet Sel ede 26 Li DETECTOR OPERATING SYSTEM s 28 11 1 JDETECIOR TOWER a tensed ee er ve viu 28 GASTECH 2 AUSTRALIA 11 2 HOMESCREEN FEATURES do put au nden Posi i n ud 29 11 2 1 User Menus _ _ EROS 29 11 3 CONFIGURATION AND CALIBRATION MENU NAVIGATION SYSTEM 30 TIL CONS 30 1143 2 ICING Roll eus 31 11 3 3 Entenng IneF n
4. 52 17 2 HANDS ON DETAILED INSPECTION 52 1 595 GAS SENSING CELL REPLACEMENT 53 142 1 REMOVING the Detector Main BOUFKU xe abcr etu eu eo ee OE PETRA eases 53 oie ____ 53 174 GENERAL DETECTOR REPAIR 54 175 JDISPOSADOFD GUARD COMPONENTS i 54 1S 55 18 1 OUTPUT CURRENT SIGNAL TOTAL LOOP RESISTANCE VS POWER SUPPLY VOLTAGE Henn 55 18 1 1 Loop Resistance D Guard With Backlight Disabled loop at 22 55 18 1 2 Loop Resistance D Guard With Backlight Enabled loop 22 55 19 APPENDIX 56 19 1 RELAY BOARD AND SOUNDER OPTIONS RA GU UM FOI DE MU RM MENO UU 56 1911 X Relay Board Functionality eoe rein ero et nta ora Fx e kV bra eU 56 19 1 2 Table of Functions identified by silk screen legend on relay board and photo annotations 57 2 EOARD CO
5. 11 6 2 SAFETY ere INN IB TION EE TTD 11 6 3 SAFE USE OF EOQUIPIVIENT sesta x ER ERROREM i enu ORE NI s ROSE SURE aan REN nus Cof 11 6 4 IIODIEICATIONS TO EQUIPMENT e imd veda cen cbe oe dae lac ue uro ducet Re ate v E teu nV tud 11 5 5 EOUIPMENT ERR 11 7 INTRODUCTION 12 7 1 PURPOSE AND CONTENTS OF tenta Rules 12 7 2 PRODUCT IDENTIFICATION AND TYPE EE NM IESU downs Gv PER HER E a Y exe Rz EON e sax Beso 12 7 3 CONTENTS Or D GUARD 2 PACKAGE ceeeeeee eene eme emn sessesesse sese sesso sese serene 13 13 8 PRODUCT DESCRIPTION reds E aaRV Fue EPA ERES ERR a Vrae VE aa ERR V Sa Vidas las i Sa Usa Va vod V PAR Pas Via SR RE us US 14 8 1 PRODUCT UL EE RT I P O M 14 8 2 DESCRIPTION OF OPERATION 14 9 15 9 1 INSTALLATION CONSIDERATIONS e ev suns Cobre SO seu ee eter qt edad 15 9 2 GENE
6. eo 98 B 5523 StrobeOutput jFlshinorSteadyillumnaton 25 1 2 Methane Detector Specifications 0 596 v v 0 100 v v NDIR Infra Red Stated accuracy temperature limits 0 to 98 MSS 13 Long term drift Zero Less than specified by 60079 29 1 64 GASTECH AUSTRALIA D Guard 25 1 3 Carbon Dioxide Detector Specifications Parameter 55 1 55 2 55 3 55 4 55 5 55 6 55 7 55 8 55 9 55 10 55 11 55 12 55 13 55 14 Carbon Dioxide INFRA RED 0 1 596 v v NDIR Infra Red 20mm diameter 510 Years 2 point zero full scale To AS2290 3 ANZ60079 29 and AS4641 0 to 40 C 10 C to 40 C 0 to 98 80kPa to 120kPa Negligible CO none NO none H2 none T90 lt 30 seconds CSS 15 Replaceable hydrophobic membrane part of enclosure 25 1 4 Electro Chemical Detector Specifications Cell dependant Parameter 155 1 155 2 155 3 155 4 155 5 155 6 155 7 155 8 155 9 155 10 155 11 155 12 Long term drift 155 13 TSS 14 Typical response Time 150 Amperometric electro chemical cell 20mm diameter Typically 2 Years to 8096 of new output signal 2 point zero and full scale To AS2290 3 ANZ60079 29 and AS4641 20 c to 40 C 20 C to 50 C 15 to 90 80kPa to 120kPa Negligible for steady state above or below 101 3kPa Negligible for steady state above or below 60 RH Zero Less than 0 01ppm to
7. AUSTRALIA 13 1 2 Set Measurement Full Scale This setting allows the user to adjust the full scale measurement range of the instrument up or down from that set by default The end user may change the full scale range in increments of 5ppm for all sensor types except Infra Red Infra Red sensors types will indicate a Change not allowed message Care must be exercised when setting higher than default full scale values since at some point for any given detector gain setting the accuracy of the current loop output signal will degrade Full scale range should be set only after proper consideration to what minimum resolution is acceptable Additionally there is an upper limit to the sensor signal level that can be handled by the system electronics before saturation occurs Once the sensor signal level has reached this saturation level no further increase in reading is possible irrespective of the value set as a full scale range Detector Type Setup Screen USER FULL SCALE A DETECTOR TYPE USE UP DON KEYS SET VALUE 1 SET THE MEASUREMENT FULL SCALE VALUE 1I SELECT THE DETECTOR BERLINE 2 USE THE FILE KEY TO STORE CHAHGES 2 USE THE FILE KEY TO STORE CHANGES Full Scale Reading 100 ee For all sensor types except Infra Red the full scale range of the Gas type is selected by the use of the up and down soft keys instrument may be set to a different value than the de
8. icon the Set Auto Zero screen operate the NEXT PARAMETER soft key To return home keep pressing the back soft key until the main sensor setup screen is displayed with the home icon showing 13 2 Alarm Configuration D Guard contains 2 gas concentration based alarms that provide indication that the measured gas has reached or exceeded a certain threshold This threshold is the alarm set point value stored within the D Guard configuration settings When an alarm set point is reached a number of actions are taken depending on the variant of D Guard being used For detector versions with optional relays fitted the appropriate relay warn or danger will change state For detectors without relays but with HART communications the alarm state is transmitted over the digital communication link For Detectors without relays or HART communications alarm conditions are signalled on the display as messages and icons As with the sensor configuration most if not all of the settings are pre set during the detectors manufacture with the most commonly encountered configuration However the end user may wish to modify these defaults to match a particular application The descriptions relating to alarm configurations given in the next sections relate to Alarm 1 however the process is identical for making changes to Alarm 2 41 GASTECH AUSTRALIA 13 2 1 Making Alarm C U S cre CAL CO 100 PPM D To Enter
9. Connect to 58 D Guard GASTECH AUSTRALIA 20 APPENDIX C 20 1 Disabling the Display Backlight By default the display backlight is enabled for Group II versions of D Guard and disabled for Group versions The backlight LEDs when enabled create a voltage drop of around 3 0V in the power supply fed to the internal electronics For many applications this is acceptable and no changes are necessary For applications where long cable lengths large barrier resistances and low power supply voltages are present it may be required to disable the backlight LEDs to gain additional voltage compliance for the current loop output to function up to 22mA Disabling the LEDs gives around 130 Ohms extra available loop resistance at 22mA or will allow the supply voltage to be operated 3 0V lower for a given loop resistance Determining whether the backlight link needs to be fitted requires an understanding of the characteristics of the components of the system into which the detector is installed If in doubt consult the system designer plant engineer or other body with knowledge of the system Place link here to disable backlight 59 GASTECH AUSTRALIA 21 APPENDIX 21 1 CHEMICAL COMPATIBILITY When installing D Guard it is important to be aware of the possible effects of chemicals on the construction of the detector Such effects may not be immediately noticeable but may over time cause signifi
10. K PARAMETER Once a change has been made the BACK arrow icon will be replaced by the save icon Operating the save soft key will commit the changes to the detector s configuration memory Once saved the back arrow icon will once again show Making further changes will return the back arrow icon to the save icon Use the NEXT PARAMETER soft key to move to the next parameter to change Alarm Trip Direction BRP 7 1 SET RISING FALLING DIRECTION 2 USE THE FILE KEY TO STORE 5 Direction FALL K PARAMETER Once a change has been made the BACK arrow icon will be replaced by the save icon Operating the save soft key will commit the changes to the detector s configuration memory Once saved the back arrow icon will once again show Making further changes will return the back arrow icon to the save icon Use the NEXT PARAMETER soft key to move to the next parameter to change Alarm Normal State Z 1 5 1 SET RELAY DEFAULT HORMAL STATE 2 USE THE FILE KEY TO STORE CHANGES Normally DE ENERGISED KY PARAMETER Once a change has been made the BACK arrow icon will be replaced by the save icon Operating the save soft key will commit the changes to the detector s configuration memory Once saved the back arrow icon will once again show Making further changes will return the back arrow icon to the save icon Use th
11. Once the cable is positioned as required tighten the cable gland nut to hold the cable in place and create the waterproof seal When connecting direct to the main system board connections are first made to the power plug supplied with the instrument and the plug is then engaged into the power socket as shown above The plug and socket are keyed for correct alignment Connection to the barrier type terminals is as shown above Connections between the terminal board and the main system board are already in place as part of the detector assembly and require no user attention 21 GASTECH AUSTRALIA 9 6 4 Conductor Preparation The ends of the conductors to be fitted into the power plug must be properly terminated with suitable ferules bootlace or flat blade The supplied power plug will accept terminations with a cross sectional area between 0 2mm and 2 5mm It is not advisable to simply strip the conductors and place the un terminated ends into the power plug as this is likely to fail over time Using striped and solder tinned conductor ends is also strongly discouraged since solder will cold creeps and compresses over time resulting in loose connections Connection to the barrier terminal connection strip is most reliable when using fork or ring type crimp terminals The barrier connector s cable clamp can accommodate conductors with a cross sectional range of 0 33 to 3 Ring fork terminals should have
12. Quick Nav SELECT A SHORTCUT TO THE SETUP GROUP HEEDED SYSTEM Once in the Quick Nav screen operate the ALARMS soft key to move to Alarm 1 Setup start page amp A1 TRIP LEVEL 1 SET ALARM TRIP THRESHOLD 2 USE THE FILE KEY TO STORE CHANGES Alarm Level 30 0 PPM 4 HEXT PARAMETER To adjust the trip threshold for Alarm 1 use the up and down soft keys to increase or decrease the value The keys are accelerated to make the increments decrements move more quickly as the key is held To move back to the previous screen operate the BACK arrow soft key To move to the next parameter to change use the NEXT PARAMETER soft key Note if these keys are operated before the save icon is visible any changes made will not be saved A1 HYSTERESIS 1 SET ALARM HYSTERESIS WIDTH 2 USE THE FILE KEY TO STORE CHANGES Hysteresis 1 0 of Trip K HEXT PARAMETER Hysteresis may be set from 0 to 10 of the currently set alarm set point and operates on the alarm deactivation point For example if the set point is 10ppm and the hysteresis is set to 10 the alarm will activate at 10ppm and deactivate at Use the up and down soft keys to increment or decrement the value The keys are accelerated to make the changes more quickly for keys held down 42 GASTECH AUSTRALIA A1 HYSTERESIS 1 SET ALARM HYSTERESIS WIDTH 2 USE THE FILE KEY TO STORE CHANGES Hysteresis 3 096 of Trip
13. AUSTRALIA 9 5 2 Detector Location Although over time gas released into a space will expand to uniformly fill it with equal concentration in many practical applications there exists the possibility of pooling due to areas that have little or no ventilation or natural movement of air For these locations higher than average concentrations of any gases present may exist since natural diffusion could well be a slower process compared to the rate at which gas is entering the area In working environments where there is a likelihood of these situations occurring proper consideration to the location of gas detection instruments is important The specifics as to what constitutes the ideal location for gas detectors are strongly dictated by the actual physical makeup of the environment Considerations could be for example likely points of release location of personnel in relation to points of release ventilation characteristics temperature volume of space in and around personnel open or confined space and maximum time durations for exposure to any released gases Knowing the characteristics of the gases to be monitored can assist in deciding on optimal locations Permissible exposure levels are covered by various health and safety standards and are not reproduced in this manual A characteristic of significant interest is the buoyancy of the gas in air essentially whether it is more or less dense than air Knowing this can provide some indicati
14. Basic visual inspection focuses on looking at the physical installation for signs of damage water or dust ingress and the condition of cables and labels Visual inspections may include the need to open cabinets to gain access to some parts of the system This type of inspection also includes cleaning the fascia and labels that have become obscured by dirt A NOTE The detector s fascia panel must only be cleaned using antistatic compatible cleaning materials Do not clean the detector with cleaning products that may create build up of static electricity During a Visual Inspection typical observations would include Check that gas inlet ports are not obstructed by dirt or moisture Check that connected cables are intact and free from cuts abrasions and obvious signs of damage Verify that cable restraints including cable glands are in serviceable condition and correctly fitted Check system equipment enclosures cable trays conduits wall boxes etc for good condition with no signs of physical damage Verify that sealed cabinets are free from water or contaminant ingress Check that door seals are in good condition Verify that labels fixed to equipment such as enclosures wall boxes and cables are present and in good condition allowing clear visibility of the information and identification they convey Verify that no unauthorised modifications have been carried out on equipment 17 2 Hands On Detailed Inspections More detail
15. STATUS The detector performs a periodic check on the gas sensor to ensure that it is both present and operating within a healthy state If the check reveals that the sensor is not present or behaving as if it were not present a fault message and icons will be displayed The fault is also logged in the fault list This fault is cleared by checking the condition of the sensor and replacing if required 14 2 Fault Log And Information Screens wi STATUS x UPDATING FAULT LOG DONE MAX TEMP LIMIT MAX CAL TEMP ALARMS OFF 5 Every fault event that occurs within the detector is added to the fault list If a fault is still present both the gas detector icon and warning icon will be present on the main measurement screen If a fault has occurred and has cleared then the gas detector icon will be cleared with just the warning triangle icon visible The warning icon flags the user to enter the detector status screen to check for events that occurred The list updates once the status screen is entered Any faults present or past are contained in the list Only one entry for each fault type is included The list may be cleared by operating the cross icon at the top right of the screen This will also clear any current alarm states If the fault condition still persists the fault will re appear in the list after being cleared 48 D Guard 5 O STATUS A similar check is made against a lower temperature limi
16. Detector Fault Sensor Presence 48 14 1 7 Detector Fault Low Sensor 5 48 14 2 FAULT LOG AND INFORMATION SCREENS n nud 48 48 14222 Sere gt 48 14 2 3 Resetting the Detector Life 48 1424 GP qoo 49 14 2 5 Internal Parameter Storage 49 15 ALARM INDICATION eis viven ____________ __ ___ 49 15 1 1 Warn Alarm Indication 49 15 1 2 Danger Alarm Indication 49 15 1 3 Latcheg Alarm ____ __________ _____ 49 15 1 4 Resetting From Alarm State eseessseeeseeeeressseereseseersserecesssrereeseeressrecessereresesreressseerosereresssrereseseerere 49 15 1 5 Temporarily Silencing AN uses tenuis ___ __________46_ 6 50 19 1 0 50 16 CONNECTING A HART FIELD COMMUNICATOR eee eee ee eee nere enne nnns urna ssa sesso senses 51 17 DETECTOR MAINTENANCE 52 Mida
17. It is however the responsibility of the personnel carrying out commissioning to ensure that all relevant occupational health and safety regulations are observed and that proper gas handling procedures are followed These tests must only be performed by suitably trained personnel GasTech Australia makes the assumption that personnel carrying out any procedure given in this manual are fully competent in the handling and use of toxic gases gas cylinders regulators and piping hoses Equipment Required For Performance Checks Purge Gas 10096v v nitrogen or clean instrument air Target Gas To match detector type Optimally balanced in air or with an instrument air content Purge gas and target gas must be contained in an appropriate cylinder fitted with a suitable regulator providing a flow rate of between 0 5 to 1 0 litres minute Appropriate hoses must be fitted to the cylinder which may include PTFE types for certain sticky gas types such as chlorine ammonia nitrogen dioxide etc Target gas concentration must not be greater than the instrument s full scale reading Target gas minimum concentration must not be less than 2596 of the detector s full scale reading Service Tool Detector calibration plug Suitably approved digital multimeter with a traceable calibration 25 GASTECH 10 4 10 5 AUSTRALIA Bump Test Conditions Bump tests must be carried out with the detector operating within its specified limits
18. is shipped with a default value that relates to the gas range selected This value may be set to match the most commonly used concentration value that the user will present to the detector during span calibrations and DRT tests Note if a calibration gas is used that does not match the value set into this function auto span and DRT checks will not be accurate measurement types with full scale ranges of 1ppm 2ppm 5ppm and for Infra Red sensor types 2 decimal Note For most measurement types concentration adjustment is settable to one decimal place For places of calibration gas setting value is provided Default Span Gas Value SET SPAN GAS 1 SET CALIBRATIOH GAS VALUE 2 USE THE FILE KEY TO STORE 5 Modified Span Gas Value 7 SET SPAN GAS 1 SET CALIBRATIOH GAS VALUE 2 USE THE FILE KEY TO STORE CHANGES Span Gas 50 0 PPM Span Gas 56 0 PPM K HEXT PARAMETER K HEXT PARAMETER From the default calibration gas value use the up and down Once the change is made and the save icon is showing the soft keys to increase or decrease the value The up and down selection can be committed and saved to eeprom Once soft keys are accelerated so continuing to hold the key saved the save icon reverts to the back icon allowing the changes the value more quickly Once a change is made the previous setup function to be accessed if required To move to home icon changes to the
19. 0 016mA Switch off the purge gas 26 GASTECH AUSTRALIA e Connect the hose to the target gas cylinder regulator outlet Observe all safety procedures surrounding the use of the gas e Turn the gas and allow to run for about 60 seconds e Observe the detector response target gas still running e The display reading should be as per the gas concentration used for the test with a maximum deviation of 3 0ppm The current loop signal response will depend on the concentration of the target gas being used for the test The method for calculating the expected current loop reading is as follows Read the gas concentration from the test gas cylinder example 49 2 ppm Note the scale configuration of the detector under test e g 0 100ppm This is a 100ppm full scale detector Divide the test gas concentration by the detector full scale number in this case 49 2 100 giving 0 492 Multiply this number by 16 in this case 0 492 x 16 giving 7 872 Add 4 to the above result in this case 7 872 4 giving 11 872 The final result is the expected loop current in milliamps 11 872mA The observed reading on the test meter should be within 3 096 of the instruments scale approx 0 32mA If the readings from the detector are outside of the limits for either the purge gas or the target gas a detector calibration will be necessary Please refer to the sections in this manual covering the operating system for accessing the det
20. 0 5ppm per 12 months cell type and environment condition dependant Sens Typically less than 3 of scale per 12 months Refer to Specific sensor data sheet lt 10 seconds from step change input TSS 15 Typical response Time t90 lt 25 seconds from step change input 25 1 5 Mechanical amp Environmental Specifications 2v Limits Description Conditions EUR TES Units MS 1 Enclosure material Antistatic carbon filled Delrin MS 2 Enclosure construction Injection Moulded MS 3 Enclosure wall section Wall thickness 6 5 7 mm 5 4 Enclosure IP Rating IP66 amp IP67 IP68 G and R versions IP65 S version MS 5 Enclosure Lid Retainer Not Retained MS 6 Enclosure Lid Fixing Four corner screws 4mm Hex Heads MS 7 Cable Glands Provision for up to 3 x 20mm nylon or chrome plated steel MS 8 Enclosure Footprint As per present D Guard Detector MS 9 Storage Temperature Non powered state 20 60 C MS 10 Operating Temperature Temperature limits outside which cell failure may occur 20 55 C MS 11 Operating Humidity Non condensing 15 90 rh 65
21. an instrument service facility at the factory as well as authorised service facilities around the world Should your instrument require service you may contact us toll free at 1800 999 902 within Australia only or 61 8 6108 0000 or visit our website www gastech com au for authorised service locations For non warranty repairs you will need to provide a purchase order number If you need to set a limit to the repairs costs state a Not to Exceed figure If you need a quotation before you can authorise repair costs so state but understand this will incur additional costs and may delay processing of the repair If you wish to set a limit to the authorised repair cost state a not to exceed figure GasTech Australia s policy is to perform all needed repairs to restore the instrument to full operating condition including reactivation or replacement of all out of warranty electrochemical cells You may send the unit freight prepaid to GasTech Australia Pty Ltd 24 Baretta Rd Wangara Western Australia WA 6065 Attn Service Department Enclose the copy of your contact details Pack the instrument and all its accessories preferably in its original packing and any special instructions Repairs are warranted for 90 days from the date of shipment Sensors have individual warranties Always include your address purchase order number shipping and billing information and a description of the defect as you perceive it If this is the first time you
22. are dealing directly with the factory you will be asked to provide credit references prepay or authorise COD shipment NOTE GasTech Australia assumes no liability for work performed by unauthorised service facilities GASTECH AUSTRALIA WARRANTY STATEMENT 1 Consumers have the benefit of conditions and warranties implied by the Trade Practices Act 1974 TPA and similar provisions of State and Territory enactments and nothing in these conditions is intended to exclude restrict or modify any statutory obligation of GASTECH AUSTRALIA PTY LTD Company if that cannot lawfully be effected 2 This warranty relates only to Equipment manufactured and services supplied by the Company its related corporations and subsidiaries Equipment or any part thereof which is returned to the Company transportation prepaid within 15 months from the date of dispatch from the Company s premises or 12 months from the date of shipment to the ultimate user whichever occurs first and is found by the Company after examination to be defective in workmanship or materials will be either repaired or replaced as determined by the Company free of charge The terms of this paragraph apply unless stated otherwise in this instruction manual 3 This warranty does not apply to a replacement or repairs which are required as a results of improper installation misuse maladjustment modification or lack of routine maintenance by others b items subject
23. is essential for its safe installation operation maintenance and removal from an application If in doubt seek advice from a supervisor and or contact GasTech Australia immediately Mechanical electrical installation and maintenance of plant and equipment must only be carried out by appropriately trained qualified and competent personnel 11 GASTECH AUSTRALIA 7 INTRODUCTION 7 1 Purpose and Contents Of This Manual This manual contains installation operating and maintenance instructions for the GasTech Australia D Guard R and D Guard S current loop 3 wire powered Smart Gas Detectors Users of this equipment must read and understand the contents of this manual in order to ensure safe use and optimum performance from the product 7 2 Product Identification and Type The products are named D Guard R and D Guard S The products classification are either as loop powered toxic and flammable gas detectors no relays or sounder or as 3 wire connected toxic and flammable gas detectors when fitted with either the relay option R version or both relay and sounder S version Individual detectors are identified by a unique serial number located on the product identification plate fixed to the side of the enclosure Reference to this label is important to correctly identify the product build and gas type Detectors must only be used in applications for which they are compatible D Guard R and D Guard S are non Ex certified d
24. its serial number identification label GASTECH AUSTRALIA Serial Number Gastecih com au These makings provide information identifying the gas type serial number and its IP rating Label Details model number and IP rating will vary depending upon the model type 65 1080G xxx Base model IP66 67 68 65 1080R xxx Relay option fitted 1 66 67 68 65 1080S xxx Relay and Sounder Strobe fitted IP65 GASTECH AUSTRALIA 4 RECEIVING AND STORAGE 4 1 Receiving All possible precautions are taken to protect the equipment against damage or losses during shipment to our customers however before accepting delivery it is strongly recommended that a check of all received items is made against the packing list or billing of lading If there is a shortage or evidence of physical damage notify GasTech Australia immediately Notify GasTech Australia within 7 days maximum in case of shortage or discrepancies according to the packing list This will assist in a speedy resolution to problems Please keep a record of all claims and correspondence Where possible taking and supplying photographs is advantageous Where practicable do not remove protective covers prior to installation unless there are indications of damage that necessitate closer inspection Packaging that has been opened for inspection and inventory logging should be carefully repacked to ensure protection of contents or else the parts should be pac
25. just grips the gasket in the enclosure base Proceed to tighten each of the four screws just one or two turns at a time continually moving from one screw to another until all screws are fully tight Doing this will help to keep the gasket flat and evenly positioned as the lid is tightened up If each screw is tightened individually uneven pressure may be applied to the gasket resulting in a less than perfect seal 23 GASTECH gt AUSTRALIA 10 Commissioning Once D Guard 2 has been mounted and electrically connected it must be commissioned Commissioning of the monitoring system to which D Guard 2 is connected is beyond the scope of this manual since specific methods will depend upon the details of the installation There are nonetheless common considerations to make in the processes of testing newly installed gas detectors The following is a recommended sequence of checks to assist in ensuring correct operation of D Guard 2 Commissioning must be carried out by suitably trained personnel operating under permitted site STOP conditions Incorrectly commissioned detectors could cause the monitoring system to become non operational in its intended manner resulting in potentially harmful situations Performing commissioning using non approved or site inappropriate equipment could create a hazard situation and increase the risk of injury 10 1 Installation Verification The specifics of performing the steps listed below will
26. main PCB supply positive input Detector board negative power supply output Alarm 1 First alarm relay Changes state when measured gas level exceeds the alarm 1 threshold setting NC and NO connections apply to normally de energised relay settings For normally energised relays the function of NC and NO are reversed Second alarm relay Changes state when measured gas level exceeds the alarm 2 threshold setting NC and NO connections apply to normally de energised relay settings For normally energised relays the function of NC and NO are reversed EE REN De energises if power to the detector is removed or if detector fault is present This configures the detector to operate in standalone mode where a system controller is not present omwresehu Hone setting only TTT TTT setting only 57 GASTECH AUSTRALIA 19 2 Relay Board Connections 19 2 1 Current Loop Connection Scheme REMOVE Lk1 Do not insert Connect to 24VBC Connect to PLC current loop input current sink only Relay Board Connection Current loop configuration OL Do oL OK Gosiech ich Zm OOM 57 1011 261009 Rev Connect to OVDC 19 2 2 Stand Alone Connection Scheme Relay Board Connection Standalone configuration Connect to Siren Lk1 MUSTBE Q INSERTED i 8 9 9 Connect to 2 ole 24VDC qp
27. not already connected connect the purge gas supply to the detector to continue BORN USE UP DOWN KEYS TO MAHUALLY ADJUST ZERO 0 2 AUTO CAL HOT POSSIBLE CAL SEHSOR TOO HOISY If D Guard has determined that an auto zero is not possible the up and down soft keys will become enabled allowing a manual zero adjustment to be made It is important to note however that a zero set manually due to a noisy sensor will have to be based on best judgment of where the zero actually lies amongst noisy readings 33 GASTECH AUSTRALIA 12 3 2 Saving the Zero Calibration Value Uy USE UP DOWN KEYS MANUALLY ADJUST ZERO USE UP DOWN KEYS TO MANUALLY ADJUST ZERO 0 0 mums 0 0 mum K SPAN CAL K SPAN CAL Once an auto zero has successfully completed the icon If a manual adjustment of the baseline is required after an will show in the top right soft key location Operating the save auto zero completes the up and down soft keys will increase key will store the zero calibration values and immediately start or decrease the baseline reading When a change in the to use the new values as the baseline reading reading has been made the save icon will be indicated again Once saved the save icon is replaced by the home icon and Saving the new manual set zero will store the reading and the soft key will return the detector b
28. risk of injury needs to be properly designed and implemented Such a system must be the result of structured risk analysis with the outcomes used to help define the safety system requirements Such risk assessments will take into considerations the nature of the application along with its processes and likely hazards The safety system requirements in turn will guide the choice of instrumentation logic solvers and actuators needed to implement the system Understanding the required functionality of the system will ensure proper selection and safe deployment of equipment A Ensure that the detector will properly perform the required functions within the system design It is important to understand how the detector will interact with other equipment within a system For safe and reliable use it is crucial that neither the detector or other system components signalling be compromised by incompatibilities between equipment 15 GASTECH AUSTRALIA 9 2 General Installation Practices Before starting the installation process read this operational manual thoroughly making particular note to any aspects that could affect the reliability or accuracy of D Guard It is essential that the operational specifications for the instrument are understood in relation to compatibility with the rest of the system Refer to Appendix C for information regarding sensor basics chemical compatibility and cross sensitivity e D Guard should be insta
29. the centre position the numeric gas readings may still move from the point the calibration was set This is normal and if observed long enough will show up as slowly increasing and decreasing readings that sit well within the detectors specified accuracy limits During all calibration functions any zero suppression settings are over ridden and set to the state Once calibration is completed and the main screen is returned to zero suppression will be set back to the state it was before entering calibration modes Following a zero calibration the current loop signal should be checked for a correct reading of 4 00mA 0 03mA 12 4 Span calibration Span calibration consists of applying target gas of known concentration and adjusting the detectors response accordingly The target gas is a mixture of gas that the detector is intended to detect and a balance gas such as nitrogen or instrument air The output response of the detector is both the displayed value and the value of the current output on the current loop system For detectors with HART communication enabled measured values will be sent over the HART protocol also 34 GASTECH AUSTRALIA 12 4 1 Auto Span Calibration 2 INUENIRI NUN ZERO CAH BE MAHUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUH AUTO CAL TO START 0 0 mum SPAN CAL AUTO CAL When entering the calibration functions the zero calibration page is the
30. the relay setup screens start by unlocking the menu system Hold the magnetic stylus over padlock icon for 5 seconds After 5 seconds has expired or correct passcode entered the calibration and setup option soft keys are activated Select SET to move to the Quick Nav screen TRIP LEVEL 30 0 PPM HYSTERES IS 1 0 OF SCALE RISE 7 FALL RISE DEFAULT STATE ENERGISED LATCH MODE LATCHED SELECT SETTINGS KEY TO MODIFY K ALARM 2 SETTINGS The Alarm 1 setup start page displays the current settings for this alarm Operating the BACK soft key will move to the previous part of the menu system Sensor Setup refer to appendix a menu map To move to make settings to Alarm 2 instead of Alarm 1 operate the ALARM 2 soft key To start making changes to Alarm 1 operate the SETTINGS soft key fem A1 TRIP LEVEL 1 SET ALARM TRIP THRESHOLD 2 USE THE FILE KEY TO STORE CHANGES Alarm Level 31 0 PPM 4 PARAMETER Once a change has been made the BACK arrow icon will be replaced by the save icon Operating the save soft key will commit the changes to the detector s configuration memory Once saved the back arrow icon will once again show Making further changes will return the back arrow icon to the save icon Use the NEXT PARAMETER soft key to move to the next parameter to change hysteresis onfiguration Changes Alarm 1 sh D Guard own SENSOR ALARMS
31. to deterioration or consumption in normal service that is those which must be cleaned repaired or replaced routinely such as but not limited to lamps bulbs and fuses pump diaphragms and valves absorbent cartridges filter elements and batteries or C goods materials or parts supplied or manufactured by unrelated third parties and provided to the Purchaser at the specific request of the Purchaser and such goods materials or parts will be repaired or replaced only to the extent of the original suppliers warranty 4 Should the Company be liable for breach of a condition or warranty other than the pursuant to section 69 of the TPA implied by Division 2 of Part V of the Act other than that implied by section 69 of the TPA the liability of the Company for such breach shall subject to section 68A 2 of the TPA be limited to one of the following as determined by the Company a thereplacement of the Equipment or the supply of equivalent Equipment b the payment of the cost of replacing the Equipment or of acquiring equivalent Equipment 5 Subject to Clauses 2 and 4 and any legislation to the contrary a representatives and agreements not expressly contained herein shall not be binding upon the Company as conditions warranties or representations all such conditions warranties and representations on the part of the Company whether express or implied statutory or otherwise whether collateral or antecedent or otherwise are hereby expre
32. type of system D Guard is intended to be used in before the detector can be installed there are number of things that need to be considered to prevent incorrect or unsafe operation of both the detector and the system into which it is installed Along with relevant competence and an understanding of the target application the following points should be considered A Ensure that the information provided in sections 1 to 6 is fully understood It is extremely important that the limitations and restrictions for use of the detector are understood in order to prevent the creation of hazardous situations and increased risk of dangerous events occurring If in doubt as to the nature of these limitations restrictions or their implication consult a competent authority such as a supervisor or GasTech Australia applications engineer A Ensure that the information in sections 11 to 19 plus Appendix A are understood It is extremely important that the functionality of the detector is fully understood in order to reduce the likelihood of creating hazardous situations and risks due to a malfunctioning detector or gas monitoring system Ifin doubt as to the functionality of the detector or the implications of incorrect use consult a competent authority such as a supervisor or GasTech Australia applications engineer A Ensure that the application into which the detector is to be installed is correctly understood Any system intended to mitigate the
33. 13 3 4 HART Tag data fixed loop 45 13 4 SYNEM CONFIGURATION li 45 134 1 SIEM Sefup ___ 45 13 4 2 Turning Detector Isolation On or nennen nennen 45 13 53 Temperature ______ __ _____ 46 P OO T a mme 46 13 4 5 Sensor Temperature 46 13 4 6 ___ _ _ _ _ _ _______ 46 47 14 DETECTOR MESSAGES AND WARNING STATES e e eee ee eee ee eee nenne nnns ntn 47 14 1 RUNNING INFORMATION AND FAULT MESSAGES Rr genu utt na En RE ay x S 47 14 1 1 HART Communications 47 GASTECH 2 AUSTRALIA 14 1 2 Detector Fault Detector 47 14 1 3 Detector Fault Detector 47 14 1 4 Detector Fault Upper Operating Temperature eene nnne 48 14 1 5 Detector Fault Lower Operating Temperature nennen nnne nna annees aane 48 14 1 6
34. 5096 and 9096 of the applied gas value This check is carried out when the detector is new and the timing values stored as a reference User DRT checks use these stored values to compare against Reading response time can slow down if waterproof membranes become clogged or sensors become old and unresponsive APPLY 50 0PPM SPAN GAS T50 T90 The DRT main screen displays entries for T50 and T90 response times Until gas is applied these values are blanks and the detector waits for gas to be applied to trigger the start of the checks The target timing values are shown in the upper status banner ai TEST COMPLETE T50 22 2 Seconds PASS T90 38 6 Seconds PASS Once the measured gas concentration reaches 90 of the applied gas the test will complete and the results displayed If both timings for T50 and T90 where within the reference values then the test is passed Results are stored in the detectors eeprom ai T50 LIMIT 30 0 SEC T90 LIMIT 60 0 SEC TEST RUNNING 4 K SET 4mA Once test gas is applied the test begins automatically A message indicating the test is running is displayed Note it is absolutely essential to use the same span gas concentration each time this test is carried out This gas concentration must be set in the user calibration gas setup menu see section 12 1 4 If the same gas concentration is not used for each test the results will
35. ALUE 1 USE UP DOWN KEYS SET TEMPERATURE 2 USE THE FILE KEY STORE CHRNGES Current Ambient 22 The temperature sensor monitors the detector s internal and sensor operating temperatures Its purpose is to provide information as to the detector s operating conditions as part of the built in self test system and for use in the sensor temperature compensation system This setting is a calibration point for the temperature sensor It is factory set and stored but the user can make non saved changes to this value The value should be set to the current operating temperature of the detector The user set value will persist as long as power is applied to the detector SCREEN INVERT M SCREEN INVERT ME USE UP DOWN KEYS TO SET VALUE 1 USE UP DOWN KEYS TO INVERT DISPLAY 2 CHANGED STATE 15 NOT STORED Screen NORMAL p KS EE COMPENSATION A USE UP DOWN KEYS TO SET VALUE 1 USE UP DOWN KEYS TO SET ON OFF 2 USE THE FILE KEY TO STORE CHRNGES Compensation giam Sensor temperature compensation may be turned on or off as required Compensation against temperature changes is optimised for the sensors supplied with the detector and those supplied by GasTech Australia USE UP DOWN KEYS SET VALUE 1 USE UP DOWN KEYS SELECT GAIN 2 USE THE FILE KEY STORE CHRNGES Gain Setting 0 imi The gain of
36. D OGUARD md 02 25 VOL 20 97 STATUS NO FAULTS 65 1080 G XXX 65 10805 65 1080R XXX USER MANUAL This manual is for model variants D GUARD C D GUARD R 65 1080G XXX D GUARD S mmm 65 1080S XXX 65 1080R XXX GASTECH AUSTRALIA GASTECH AUSTRALIA This Page Left Intentionally Blank MANUAL CONVENTIONS EET 7 1 WARNINGS CAUTIONS AND NOTES cccccccccsccscccccccccccccccccsccccccccccccscecccccccecesccccsceccecesccccsceccecesccceeces 7 2 EIIVIITATIONS OF USE aV oe 8 PRODUCT MARKINGS 9 4 RECEIVING AND STORAGE caus 10 4 1 TE 10 4 2 6 E Eid etie 10 4 3 GE MIA PCT AN 10 5 GASTECH AUSTRALIA CONTACT DETAILS csscccccsscccccscccccssccccnsccccansccccssccccessccccessccccsscccccsscccssscccess 10 6 GENERAL SAFETY PRACTICES eet vae s da Va Eye NS A RATEN Te Vea Ve SU Va E VN AVI Eos A 11 6 1 RELEVANT PERSONNE RC
37. GASTECH AUSTRALIA D Guard 12 3 Zero Calibration Zero calibration consists of applying a purge gas i e a gas that does not contain any trace of the detector s intended target gas and adjusting the detectors response accordingly The output response of the detector is both the displayed value and the value of the current output on the current loop system For detectors with HART communication enabled measured values will be sent over the HART protocol also 12 3 1 Auto Zero Calibration CAL CO 100 PPM After unlocking the menu system CAL gives access to detector calibration SET gives access to the configuration functions The D and A icons access detector information screens Select CAL to continue Th 2 ZERO MANUALLY SET AFTER AUTO ZERO COMPLETES PRESS AUTO CAL TO START 0 0 mmm AUTO CALIBRATE WILL COMPLETE IH 3 K SPAN CAL RUN AUTO CAL Once the baseline gas is within the allowable range the Auto Cal soft key can be used to start the process A countdown timer indicates the time from pressing the key to the process beginning During this time the trend bar may be observed for a stable reading as D Guard checks for a stable reading ZERO MAHUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUH AUTO CAL TO START 0 5 PLEASE WAIT CHECKIHG SEHS
38. H SELECT SETTINGS KEY TO MODIFY K SYSTEM SETTINGS The main HART setup page displays the features that may be configured by the user Operate the SETTINGS soft key to start configuration p HART ON OFF 1 SET HART COMMUNICATION OH OFF 2 USE THE FILE KEY TO STORE CHANGES HART Data ON K PARAMETER Once change is made the save icon will show Operate the save soft key to commit the changes to configuration memory Following the save the detector will reboot 44 GASTECH AUSTRALIA VIEW HART TAGS ERROR STRTUS 0 LOOP MODE VARIABLE DESCRIPTION 502 20 PPM UNIQUE 10 1193046 DEVICE DESCRIPTION GTR FHI SHORT TAG TAG LONG TAG LONG TAG USER MESSAGE GASTECH AUSTRALIA D PREVIOUS PARAMETER Navigating to the VIEW HART TAGS screen allows the detector ID strings to be viewed read only along with other relevant HART related parameters For full details refer to the D Guard HART implementation manual 13 4 System Configuration D Guard amp VIEW HART TAGS ERROR STATUS O LOOP MODE FIXED 4 0049 DESCRIPTION 502 20 PPM UNIQUE 10 1193046 DEVICE DESCRIPTION SHORT TAG TAG LONG TAG LONG TAG USER MESSAGE GASTECH AUSTRALIA PREVIOUS PARAMETER The present communication operating mode of the detector s is reflected in the screen top banner Variable indicates that the detector is set for point to p
39. NNECHONS TT 58 19 2 1 Current Loop Connection 5 58 21922 Sland Alone Connec 58 20 lt dec 59 20 1 DISABLING THE DISPLAY BACKLIGHT 59 21 APPENDIX 60 _________ ___ 60 22 61 Pod CROSS SENSITIVITY TOXIC ENSOR E 61 22 2 GROSS SENSITIVITY 1 SENSORS y FERMO Fed SUVS e E Da 61 23 APPENDIX ae G Ce X 62 23 1 ENVIRONMENTAL EFFECTS ON DETECTOR eee eene nennen rte shentee sterne 62 232 TEMPERATURE oe E 62 L PRE 62 62 GASTECH 2 AUSTRALIA 24 APPENDIX M 63 24 1 SYTEM MENU MAP ccc 63 25 APPENDIX PE 64 23 1 JPERFOBIVANCESPEGIPICATIONS TEE SA N E 64 25 1 1 Genera
40. OR STABILITY h K SPAN CAL RUN AUTO CAL If the sensor is old and has become electrically noisy it is possible that the readings will not be stable D Guard checks the noise level and flags a warning if it is too great to perform a reliable auto zero calibration The extent of the instability can be gauged by the distance the trend marker moves from the centre position In some cases if the sensor noise is variable the detector may revert back to the auto zero countdown If instability returns the stability warning screen will again be shown D Guard re tries the auto zero process a number of times before stopping 1 2 ZERO MAHUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUH AUTO CAL TO START 0 0 7 KY SPAN CAL AUTO CAL This page allows the detector s auto zero function to set the baseline value Operate the Run Auto Cal soft key to continue Purge gas should be applied to the detector at this time 2 ZERO MAHUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUH AUTO CAL TO START 35 1 mem APPLY PURGE GAS TO SEHSOR K SPAH CAL RUH AUTO CAL If the baseline gas concentration is greater than 1096 of the detector s full scale a warning to apply purge gas is displayed A flashing gas cylinder icon is also displayed The Run Auto Cal soft key will not operate at this stage If
41. Operating the detector outside of its limits could cause performance problems or functional failure Bump Test Procedure Bump testing involves applying test gas to the detector and observing the readings from it Readings should be obtained either from the detector s display or the controller display If it is required to monitor the current loop signal and there is no provision for accessing it within the installation wiring the detector enclosure must be opened to gain access to the test terminals on the main circuit board A Current Loop Test Points Do not short the test points to ground or connect to the shield or the signal return terminals Doing so may cause damage to the detector electronics The bump test procedure should be carried out as follows example assumes a 0 100ppm H2S detector Decide on the appropriate method for observing the readings display current loop Remove the splash guard from the detector gas entry port the splash guard is removed via two 4mm Allen key type screws Attach the calibration adaptor with attached 6mm hose to the detectors gas inlet port by gently pushing it into place Connect the hose to the purge gas cylinder regulator outlet Turn on the nitrogen supply and allow to run for about 60 seconds Observe the detector response nitrogen still running The display reading should be 0 0 0 1 The current loop output should be 4 00mA with a maximum variation from ideal of
42. PRIOR TO USIHG AUTO CALIBRATIOH SEE GAS SETUP MEHUS SELECT SETTINGS KEY START SETTINGS This page provides information and guidance on using the span calibration functions available Operate the Settings soft key to continue APPLY 50 0PPM SPAN GAS 96 3 KY MAHUAL SPAN BERLE gt AUTO CAL Once the target gas has been applied the warnings will stop being indicated and the Run auto Cal soft key will become active Observing the trend indicator will show when the gas reading has stabilised If the marker is in the centre position then the auto span process can be started If the marker is not in the centre position the sensor has not stabilised and auto span is not possible To continue operate the Run Auto Cal soft key DUUM APPLY 50 0PPM SPAN GAS CHECKIHG SEHSOR STABILITY AUTO CAL 56 4 PLEASE WAIT K MAHUAL SPAH If the sensor is old and has become electrically noisy it is possible for the readings to be unstable D Guard checks stability and shows a warning if instability is too great to perform an auto span calibration The extent of the instability can be gauged by the distance the trend marker moves from the centre If the sensor stability is variable the detector may revert back to the auto span countdown If instability returns the stability warning screen will again be shown D Guard re tries the auto zero process a number
43. RAL INSTALLATION PRACTICES ccccccccececccccccececscecsaceceaceceacecsncecenceceacecsaceseaceceacecencecsacecenceeeaceceaceueas 16 9 3 DETECTOR DIMENSIONS AND MOUNTING ORIENTATION ccccececcccscccccecececececcececcecsacececcecsaceceacecsaceceaceceacenes 16 9 4 INSTALLATION CONSIDERATIONS eeu or SU tds udo e pou EQ ier cua ptr aud woes oO 17 DAD POWT SUPPE 17 9 4 2 Typical Connection to power supply and 17 9 4 3 Maintaining Correct Operating 5 17 9 5 IIOUNTINGTHE ENCUOSURE ede edet pipe ee debere Dre ses eed d ave C pa rgo eee ned oL top 18 9 5 1 Mounting Surfaces and eene 18 9 52 J Detector gt ________6_ __ 19 9 6 EUBCTRICALCONNEGTIONS ss ausos notis 20 O5 Terminal ACCESS to a 20 96 2 MONNCCHON __ 21 9 6 3 Caple Entry anda Cobllhecti sse n i Ot e o Mei e dit UE 21 964 Conductor Prepara ON eo ise eet _____________ _ _ _ ____ 22 96 5 Installation Cable CHOICE tuuc lon koe ceto d Deo ata UR 22 Lo Mave ONERE CDE 67 TT 23 967 Ine Detector COVEN roe os lo Po 23
44. SETTINGS KEY START 4 ALARM 1 SETTINGS x When SET is selected from the Quick Nav screen the main Sensor setup screen is shown Select the SETTINGS soft key to start sensor configuration 13 1 1 Set Guard Band This setting allows the user to enable or disable the measurement guard band or zero suppression that assists in keeping the detector s baseline readings stable This suppression band is hard coded into D Guard and holds the readings at zero only whilst they are close to a real zero point This function is most often used to prevent negative readings The user can set the Guard band on or off SET GUARD BAND SET GUARD BAND 1 SET BASELINE GUARD BAND OH OFF 1 SET BASELINE GUARD OH OFF 2 USE THE FILE KEY TO STORE CHANGES 2 USE THE FILE KEY TO STORE CHAHGES Guard Band OFF Guard Band ON D n PARAMETER From the Guard Band OFF position use the up and down soft Once the change is made and the save icon is showing the keys to toggle between ON and OFF Once a change is made selection can be committed and saved to eeprom Once the home icon changes to the save icon saved the save icon reverts to the back icon To move to the Set Auto Zero screen operate the NEXT PARAMETER soft key To return home keep pressing the back soft key until the main sensor setup screen is displayed with the home icon showing 39 GASTECH
45. able oxygen 8 2 Description Of Operation The D Guard smart gas detectors are designed to sense gases that enter them via the process of natural diffusion through the gas entry port The sensor type used within the D Guard to detect the gas is dependent upon the specific characteristics of the gas needing to be monitored If the gases to be monitored pose a risk of being toxic then a D Guard with electro chemical type cells must be used With the exception of hydrogen if the reason for monitoring gas is due to the risk of ignition then a D Guard fitted with Infra Red sensors should be used For detection of hydrogen a D Guard with an electro chemical cell should be used For monitoring oxygen levels for depletion a D Guard with an oxygen sensor must be used In any environment gases released into an open space will spread out diffuse to equally occupy the volume of space available The diffusion of gases occurs due to mechanisms such as natural or forced air currents as well as molecular collisions Whether the space into which gas is released is totally empty of any gas molecules or already contains gas molecules e g air the molar concentration a measure of the actual number of gas molecules or the volumetric concentration a measure of relative amounts of each gas component in a mixture of a gas at any given location and time will relate to its concentration at the point of release the volume of space into which it expands a
46. ack to the main screen if revert the soft key icon back to the home function operated 12 3 4 Notes On Zero Calibration The purge gas source to the detector should be flowing at about 1 litre min for the most reliable calibration Flow rates of 0 5 litre min are acceptable but may take longer to bring the sensor to a stable zero point Flow rates lower than 0 5 litre min are not generally recommended for calibration purposes the purge gas must be left flowing for as long as necessary to bring the readings to a stable baseline point Generally this will be 60 120 seconds but could be as long as 5 minutes depending on the type of gas sensor and what was applied to it prior to the purge gas source The trend bar on the calibration screens is designed to allow more visibility regarding the signal trend It is often difficult to gauge whether a reading is rising falling or has stabilised by just looking at the displayed numbers The trend indicator will settle at the middle position once the raw sensor signal has stabilised and sat within a narrow band of values for around 5 seconds Once the trend indication is in the centre position the reading can be deemed stable enough to calibrate within the detectors specified accuracy limits It is important to note that over time all gas sensors will show a small amount of cyclic readings If the trend bar has been used to gauge a stable reading and a calibration is carried out based on it indicating
47. arying the material construction of the electro chemical cells sensors can be optimised towards different gas types along with differing sensitivities An important point to note however is that for any given gas sensing cell type even though optimised for a particular target gas there may be sensitivity to other gases This is known as cross sensitivity and is inherent in the mechanism by which the cells operate The following table gives an indication of cross sensitivities for each of the D Guard detectors This information is very useful in determining the likelihood of false readings or possible alarm conditions due to the effects of cross sensitivity Locating a detector in an environment that is likely to contain gases other than the one specifically being measured can cause operational problems Table of percentage cross sensitivity for typical D Guard gas detector types 19 moo pm p px a sx 40 45 o P066 l0 __ JO pt Ya tm pf tf toa tom pf tte va fH _____ 400 526 ffm 80H __ 2 ess 1056 wa J fv O JO l 014 fmf ds Jo 0 o 0 03 As an example 400ppm of hydrogen sulph
48. cant deterioration of the enclosure Even relatively small amounts of non compatible substances can cause such degradation and should be considered Some examples of material deterioration are discolouration rust like deposits and distortion of the enclosure shape Other changes may not be visible such as the characteristic strength of the enclosure material changing thus rendering the housing brittle The following table lists typical performance for the enclosure material for exposure to some common substances including the gases that the detector may be installed to measure The performance of the enclosure materials with exposure to these substances will depend on the nature of the application therefore the information given below is for guidance only Reton Nes Peenzene Ci cellent Rte Een Calcium hyperchlorite Severereaction Carbon Monoxide Carbon Tetrachioride SSCS Ehan OOOO rsen eem O O o O oS Excellent no effects on material composition OK Can be used with possible effects as noted Severe reaction likely to become damaged if exposed to high concentrations for prolonged periods 60 GASTECH AUSTRALIA 22 APPENDIX E 22 1 Cross Sensitivity Toxic Sensors By v
49. ces if the detector is to function correctly Particular attention should be paid to the minimum and maximum voltage output from any power source since the ability for the detector to properly signal measured gas concentrations will depend on correctly chosen power supplies 9 4 1 Power supplies If the power supply voltage is too great there is a risk of damaging the detector Power supply voltages that are too low at the detector input terminals may prevent the full 3 3mA 22mA signalling range being available at the system controller input 9 4 2 Typical Connection to a power supply and controller Power supply Sensor Controller 9 4 3 Maintaining Correct Operating Conditions When handling the D Guard during installation great care must be taken to not damage any part of the system components since this may compromise its functionality Damage caused by mishandling or by connection to incompatible equipment could render inoperative those aspects of the detector that product correct operation and safety rely on If any damage is evident to any part of the detector electronics or enclosure system it must not be used If such damage is present advice from GasTech Australia should be sought to remedy the problem before proceeding 17 GASTECH AUSTRALIA 9 5 Mounting the Enclosure The D Guard enclosure provides two mounting feet that are external to the enclosure These are located to the left and rig
50. contained in this manual may result in invalidation of the conditions of warranty and additionally create hazardous operating conditions GASTECH 2 AUSTRALIA D Guard 2 Limitations of Use D Guard G D Guard R and D Guard S Detectors STOP Can NOT be used in Group I hazardous area applications Can NOT be used in Group IIC hazardous area applications Can NOT be used in Group IIB hazardous area applications Can be used in conjunction with other equipment as part of a safety instrumented system for the purposes of risk reduction The detector is NOT designed to be used as the sole means of ensuring safety to personnel or equipment Must not be used in an oxygen enriched atmosphere Must not be modified in any manner As supplied the unit is constructed in accordance with and is compliant with the quality and performance standards against which it has been designed and tested Modification to its construction will invalidate the product s warranty Is not on site repairable and contains no user serviceable parts sensors and filter excepted GASTECH 2 AUSTRALIA D Guard 3 Product Markings The D Guard G D Guard R and D Guard S Gas detectors are designed for use in general purpose non certified applications only Their suitability for use in any particular application depends on the product variant and the sensor type fitted The detectors carry the following information as part of
51. depend on the nature of the installation and any conditions governing the installation site or area Before each of the steps are followed it is essential to ensure that appropriate measures and precautions have been taken to reduce the likelihood of a hazardous situation being created and that the risk of triggering a dangerous event is not increased e g ignition of combustible gas It may not be possible or practical to carry out every one of the steps given below STOP If in doubt regarding the methods of commissioning or possible outcomes of carrying out commissioning steps consult an appropriate supervisor for advice or training Do not conduct commissioning on a system unless fully competent to do so and only with the knowledge that it is safe to do so e Ensure that power to the detector is isolated at the controller side of the installation e Visually check that detector mounting conforms to information given in this manual e Check that all electrical connections within the detector s are correct per this manual e Conductors should be marked and coded at each end for easy identification e Check that the power supply feeding the detector is of an appropriate type and that it is matched to the detector s requirements e Switch on the system power and check that the supply voltage at the detector power terminals meets the requirements given in the detector specification table at the end of this manual Newly powered up detecto
52. disassembly to restore the detector to a fully assembled state Once a sensor has been replaced a full re calibration of the detector is necessary return the performance to its stated specification At the same time the cell is replaced the water repellent membrane that protects the gas entry port should be inspected and replaced if required 53 GASTECH AUSTRALIA 17 4 General Detector Repair With the exception of the gas sensing element and the hydrophobic membrane D Guard contains no user serviceable parts If a fault develops the detector must be returned to GasTech Australia for repair It is essential that no attempt is made to repair a faulty detector by the end user since this may compromise the safety of the unit resulting in potential operational hazards that may endanger the life of personnel 17 5 Disposal of D Guard Components When D Guard has reached the end of its service life it must not be treated as general waste The electro chemical cells used to detect gas contain substances that could potentially create an environmental hazard Under no circumstances should the cells be incinerated by the user since they could release toxic fumes When cells are replaced by GasTech Australia GasTech Australia will properly dispose of the used items Disposal of the electronics enclosure or any ancillary part of the detector must be done in accordance with appropriate local government regulations By re
53. e NEXT PARAMETER soft key to move to the next parameter to change Alarm Latching D Guard 1 SET RISING 7 FALLING DIRECTION 2 USE THE FILE KEY TO STORE CHAHGES RISE K PARAMETER Alarm trip direction may be set either Rising RISE or falling FALL and sets when the alarm should become active in relation to an increasing or decreasing measured gas concentration The default settings are based on the gas type currently selected and configured A warning will be indicated if a direction is set that may be inappropriate to the selected gas type is made Use the up or down soft keys to toggle the setting between rise and fall Direction 1 1 SET RELAY DEFAULT STATE 2 USE THE FILE KEY TO STORE 5 Normally ENERGISED K Alarm Normal State sets whether relay when fitted is in an energised or de energised condition under normal non alarm operating conditions The default is always normally energised since this provides failsafe indication of power failure to the detector Use the up or down soft keys to toggle the setting between ENERGISED and DE ENERGISED A1 LATCHING 1 SET RELAY LATCH ING HOH LATCH ING 2 USE THE FILE KEY TO STORE CHAHGES Mode NON LATCHED K HEXT PARAMETER Alarm Latching sets whether a relay when fitted will remain in its alarm state after the c
54. ector s calibration functions 27 GASTECH AUSTRALIA 11 Detector Operating System D Guard is shipped with the gas type and range configured per the end users requirements when purchased In general since many of the gas related functional settings are common to many applications D Guard has been setup with the most commonly encountered configuration based on the selected gas type and range For many end users and applications no further setup is required For those applications that require alternative configurations D Guard includes a comprehensive user interface system making modifications to system settings fast and efficient This same system gives access to commonly used calibration functions that will be required to be used on a regular basis to maintain detector performance A menu map for all of the available screens is given in appendix c D Guard has a high resolution high contrast LCD that provides clear and easy to read screens for all gas readings status messages and menu items The detector uses four magnetically sensitive switch devices that operate as user buttons keys The functionality of each button is context dependant based on the menu screen in use This system of soft keys is described in section 10 3 1 11 1 Detector Power Up For the first sixty seconds following power up D Guard displays the start up screen This is the detector warm up phase and holds the instrument in a default condit
55. ed inspections would include all of the aspects of visual inspection with additional checks that cover the verification of the integrity of connections fixtures and fittings Hands on inspection may include the use of tools Addition to basic visual observations hands on checks would typically involve Ensure that the gas inlet port waterproof membranes are intact by removal of the gas port splashguard Check the inside of D Guard enclosure for signs of moisture or contaminant ingress Verify that the detector enclosure lid seal is in good condition Re fit D Guard enclosure lid and properly tighten all fixing screws Verify screw heads are not damaged Verify that equipment housings wall boxes and other mechanical fittings are secured properly Verify the proper fitting of lids for terminal boxes the tightness of cable glands and the integrity of wall box mountings DIN rails etc Verify that all electrical connections are secure with no loose screw terminals Verify that DIN rail mounted terminals are firmly secured fitted to their rails 52 GASTECH AUSTRALIA 17 3 Gassensing cell replacement As described in section 11 1 electro chemical sensing cells will eventually diminish in their capacity to accurately detect its target gas Infra Red sensors although more likely to last several years may become unserviceable due to contamination Once this occurs the sensing element will need replacement Sensor replacement must o
56. emory is checked for consistency The same checks are made when any calibration of configuration parameters are changed b the user If the stored data has become corrupted the display will indicate a warning message to show that either the calibration or configuration system data is not healthy To clear this warning try recalibrating or reconfiguring the detector If these steps do not clear the fault please call GasTech Australia for advice 1017 STATUS WARN If the measured gas concentration reaches the set point programmed into the detector for a danger condition the detector will signal this via a prominent message in the lower status bar Additionally a flashing alarm bell icon will be displayed If the detector has relays fitted the danger relay will activate The behaviour of the alarm bell icon will depend on whether latching or non latching alarms have been configured If the detector alarms are set to non latching the alarm state will automatically clear once measured gas concentration has dropped below the set point including any set hysteresis value If alarms are set to latched mode they must be manually cleared once it has been determined that it is safe to do so To reset the alarms unlock the system menu and use the soft key to navigate to the detector status screen GASTECH AUSTRALIA 8 STATUS x A UPDATING FAULT LOG DONE MAX TEMP LIMIT MAX CAL TEMP ALARMS OFF 5 It is occasio
57. ess to the menu system requires a deliberate key action Gas Type And Range This is a fixed indication of the detector s target gas and its full scale measuring range Temperature This reading indicates the temperature within the detector body The temperature value may differ from ambient temperature by a few degrees Icon Locations Depending on the status of the detector and or specific menu pages these locations on the display will be occupied by status icons When an icon is not active its place is marked by a small circle Details of the icons are given in each section where it may be indicated Status Messages This area of the display is dynamic and provides clear indication of specific conditions such as warn alarm danger alarm under over range sensor faults etc The default indication for a detector operating normally is NO FAULTS Measurement Units This is a fixed display area showing the gas concentration units in use Function Indicators Messages and icons in this area show when required to indicate that a system function is active or to guide the user 29 GASTECH AUSTRALIA 11 3 Configuration and Calibration Menu Navigation System D Guard uses soft key navigation system to allow fast access to various detector configuration and calibration functions Depending on the context of the configuration or calibration screen being accessed the four keys will have specific actions assigned to them With
58. etectors and MUST NOT be used in applications requiring explosion protected Ex certified equipment The gas type and range detectable by the unit are set by the combination of an appropriate sensor type being installed and by configuration via the set up menus However for the product to remain compliant with its warranty end users are NOT permitted to change the gas type measured by substitution of sensor type This is only permitted to be carried out by GasTech Australia or an approved GasTech Australia representative STOP If changes to the gas sensor type are carried out by the end user product warranty will be invalidated A End users may change the gas measurement range and displayed gas name via the configuration menus and or HART communications however GasTech Australia will not accept responsibility for nor accept liability for damage or injury caused by instruments rendered unsuitable for any particular application following such changes The facility for configuring the detector from within its operating system is primarily intended for use by GasTech appointed distributors and service teams The following table specifies the default as supplied product variations 1 Optional Relays Fitted Relays and sounder strobe fitted 0 2526 volume 0 596 viv 0 100 v v LEL Client Specified ______________ o Table 1 Standard Custom Gas Types and Ranges covered by t
59. fault When a change is made the home icon changes to the save Increments are in units of 5ppm Note that if the full scale icon When the changes are saved the detector reboots to range is set too high for the current detector gain setting make the changes effective readings may become unstable 13 1 3 Detector Type This setting allows the detector to be configured for a specific target gas and full scale measurements range setting must only be carried out on advice from GasTech service engineers or authorised representatives Changing the detector to a different gas type without changing the sensor type to match will result in incorrect detector operation or malfunction GasTech Australia will not accept responsibility for events that may occur following changes made by non competent personnel A This setting is intended to be used by end users ONLY if they are competent to do so Changing this Competence within this context implies training having been given by GasTech Australia Once a change to gas type and range is made and saved the detector reboots to effect the changes The calibration and configuration state are returned to default requiring the instrument to be re calibrated and any user configurations reinstated 40 GASTECH AUSTRALIA D Guard 13 1 4 Setting Span Gas Concentration This setting allows the user to enter the gas concentration value being used to calibrate the D Guard
60. first one seen Operate the Span Cal soft key to move on to the span calibration pages APPLY 50 0PPM SPAN GAS 0 0 mem APPLY SPAH GAS TO SEHSOR K MANUAL SPAN RUN AUTO CAL The Settings soft key moves to the auto span function From here automatic span calibration can be started or the manual span function accessed A warning to apply the target gas is indicated The expected span gas concentration is programmed into D Guard during manufacture This can be user modified if required see section 12 1 4 on how to do this Until a valid target gas is applied the warning message and gas cylinder icon will be displayed and the calibration process disabled Target gas must be applied at this point to continue Al APPLY 50 0PPM SPAN GAS 34 9 mm AUTO CALIBRATE WILL COMPLETE IH 5 K MANUAL SPAH RUH AUTO CAL After the Auto soft key has been operated a countdown period starts before the span calibration process begins During this time D Guard checks the stability of the gas readings The stability of the readings can be observed on the trend indicator If the readings are stable and the trend marker is in the mid position the auto span process will start If however the readings are not stable a warning message will be shown D Guard MAHUALLY AUTO CALIBRATE DETECTOR 5 CALIBRATIOH GAS VALUE MUST BE SETUP
61. from the Sensor Setup then selecting Alarm 2 D Guard data communication uses a Bell 202 FSK type system that is compliant with the HART Communication Foundation protocol Data is transmitted and received over the detectors 2 wire connections The protocol used is compatible with version 7 0 of the protocol Full details of the configuration and use of the HART communications is covered in the HART implementation manual Within the detector there are numerous registers that must be populated with detector identification data and others that can optionally be used to convey useful information to the connected system These registers are accessed via the HART communications link using a HART Field Communicator Configurator D Guard allows the HART functionality to be turned on or off from the user menu and to read the HART register data product ID etc SENSOR ALARMS CONFIGURE DETECTOR OPERATION FEATURES SELECT A SHORTCUT TO THE SETUP GROUP HEEDED SYSTEM To access the HART data setup unlock the menu and operate the DATA soft key amp HART ON OFF 1 SET HART COMMUHICATIOH OH OFF 2 USE THE FILE KEY TO STORE CHAHGES HART Data OFF The default state for HART communications is OFF Use the up or down soft keys to toggle the setting between and HART SETUP SET HART COMMUH ICATIOHS OH OR OFF VIEW HART IDEHTIFICATIO
62. ftware routines provide compensation for static or slow moving changes in ambient temperature However rapid changes in temperature if severe enough can impart transient shifts in the detector s output signal The effect is generally low level but in systems where alarm points are set close to the normal zero operating point false alarms could occur For this reason wherever possible locate the detector out of direct sunlight or other sources of heat that may be cycled 23 3 Pressure Static or slow rates of change of atmospheric pressure will have little effect on the performance of D Guard Toxic gas detectors Transient pressure changes can however cause spurious responses generally lasting for tens of seconds Oxygen sensors are more severely affected than other electro chemical type detector types Infra red sensors will show a response to pressure changes that is described by the ideal gas laws The molar concentration of a gas n is proportional to pressure according to n pv rrt where pressure v volume ideal gas constant and t absolute temperature Detectors will respond to both positive and negative pressure transients but the response in a toxic gas sensor to positive transients is about 3 times greater than for negative transients Infra Red sensors will respond equally to positive and negative pressure shifts Detectors should not be located in sealed rooms with doors that may be opened and closed rapidly or in
63. g voltage at detector 13 0 VDC GS 7 Maximum Loop Resistance At Vpsu 28V with backlight see graph 720 Ohms GS 8 Absolute Maximum Supply Voltage Maximum supply voltage no damage to electronics All versions 30 VDC GS 9 Loop Error Signal low electronics fault Detected faults within hardware or software 3 3 mA GS 10 Loop Error Signal low sensor fault IR Head failure 3 3 mA GS 11 Display Graphical display 400 pixels by 240 pixels High contrast type GS 12 Temperature Sensor Semiconductor temperature sensor 20 110 GS 13 Pressure sensing Ambient optional MEMS based absolute value Instrument body and head 50 115 kPa GS 14 Sensor keep alive battery optional 3 6V 55mAH lithium coin cell PCB mounted encapsulated GS 15 Digita Communications HART 7 0 over 2 wire current loop refer separate specification GS 16 _ Relays Optional for variants 2x Single Pole Change Over for warn and alarm 1 fault relay GS 17 Relaymax contactcarrycurrent Non Switched current handling Carry Current Relay maximum contact power Resistive 20 195 19 Relay contact voltage rating switching Switched contact voltagelimit_ t 24090 VACDC GS 20 Relay healthy operating state Normallyenergised Normallyde energised configurable 6521 Relaystatechanges UsersetGasleve systemfaut 5522 SounderOutput Sound pressurelevel
64. has been re configured to a different type via the system menu the calibration state of the instrument is returned to the default condition as new i e not calibrated The instrument requires a zero and full scale calibration following a sensor type change To indicate that a calibration is required the display indicates the warning message CALIBRATION FAULT This message automatically clears once the calibrations are completed STATUS 15 Alarm Indication STATUS WARN If the measured gas concentration reaches the set point programmed into the detector for a warn condition the detector will signal this via a message in the lower status bar Additionally a static alarm bell icon will be displayed If the detector has relays fitted the warn relay will activate The behaviour of the alarm bell icon will depend on whether latching or non latching alarms have been configured STATUS If the condition that triggered an alarm response has subsided and the detector s alarms have been set to latched the bell icon will be indicated in inverse colour If the alarm condition was at warn level the bell icon will be static If the alarm condition was at danger level the bell icon will be flash 49 D Guard STATUS TP AP MET STATUS lee ICE A During the detector s start up sequence critical calibration and configuration data that is stored in the instruments non volatile m
65. he D Guard G D Guard R and 0 25 ranges 12 GASTECH AUSTRALIA 7 3 Contents Of D Guard 2 Package The shipment package for an individual D Guard should contain the following components Gas Detector assembly User Manual Combined enclosure splashguard key and calibration magnet Manufacturing Quality certificate If the received package is incomplete please contact GasTech Australia or the distributor that supplied the product Refer to Section 4 for unpacking and storage information 5 MONITORING jx D Guard GASTECH Gas Detector 65 1 080C Serial Number di O O H2S 100 PPM E 0 Q S lt ee 13 GASTECH AUSTRALIA 8 PRODUCT DESCRIPTION 8 1 Product Function The D Guard smart Gas detector s function is to detect the presence of gas or reduction in oxygen concentration in the environment immediately surrounding it Such gases may be toxic flammable or asphyxiant where concentrations may exceed safe exposure limits for occupants or combust in the presence of ignition sources The D Guard detector range is designed to connect to other equipment or systems that are responsible for activating ventilation and or sounding alarms to mitigate the risks associated with the presence of increased concentrations of gases or low levels of breath
66. hole slot size greater than 3 7mm to allow the terminal screw to pass through them freely 9 6 5 Installation Cable Choice For correct and reliable operation electrical connections between the D Guard detector and the rest of the system must only be made using appropriate cable The choice of cable will depend on application and general adherence to the wiring regulations appropriate for the installation The presence of electrical noise in an installation can cause instability of the instrument readings if not considered and removed by proper wiring methods Instability of this type generally shows as the measured gas value changing fairly rapidly in a random way Electrical noise may coincide with a piece of equipment e g variable speed drive switching on off or as its speed is controlled The size of the apparent changes in gas reading due to electrical noise could be sufficiently large to cause the detector to enter an alarm state especially for instruments with low alarm ranges such as 1ppm or less With proper cable shielding noise can be dramatically reduced or eliminated allowing the response from the detector to properly represent the ambient gas conditions The normal detector response is steady with only small slow variations in readings If there are no background levels of gas present then the readings should be stable at or near zero with no significant variations The actual configuration of the shielding will depend up
67. ht of the instrument and can accommodate screw bolt sizes up to M8 95 f m 5 10000000060 GdsTeth 60 2 140 160 9 5 1 Mounting Surfaces and Environment The surface that the detectors are to be mounted to should be as flat as possible to provide stable secure fixing If the mounting surfaces are uneven and mounting screws are over tightened it is possible to apply undesirable stresses to the enclosure mounting points Ingress rating may also be affected if the enclosure is deformed by mounting to an uneven surface Do not mount the detector to a surface using adhesive materials as this will not allow easy removal if necessary Additionally the use of adhesives on the enclosure will void the product warranty Adhesive fumes may also cause degradation to the gas sensing cell leading to premature failure Ensure that any surface coverings such as paint do not emit vapours Many paints can release VOC s Volatile Organic Compounds that if sufficient in concentration can react within the electro chemical gas sensing cell This reaction can cause errors in reading shorten the life of the cell or cause cell damage If the detectors are to be mounted into a newly built and painted area it is strongly advised that paints be allowed to dry thoroughly before installing the detectors 18 GASTECH gt
68. ide would produce a response equivalent to 180ppm in a carbon monoxide sensor per the table value of 4596 cross sensitivity 0 45 x 400ppm 180ppm equivalent response The actual displayed value and the value transmitted over the current loop will ultimately depend on the actual detector full scale range Cross sensitivity data relates to the raw signal from the gas sensor before any scaling is applied O2 sensors do not respond to CO but exhibit a change in sensitivity to Oxygen when exposed to CO 22 2 Cross Sensitivity Infra Red Sensors The cross sensitivity for infra red sensors includes all hydrocarbon gases that share the same absorbance wavelengths For a detector specified to measure methane CHa a calibration curve that provides a linear response to methane is employed The sensor will respond to other hydrocarbons but will not necessarily produce an accurate or linear response For applications designed to monitor methane where multiple hydrocarbons may be present allowance must be made for the possibility that the detector will read higher than expected due to the increase in sensor response to the multiple gases 61 GASTECH AUSTRALIA 23 APPENDIX 23 1 Environmental Effects on Detector Performance Environmental changes in temperature pressure and humidity can alter the performance of the sensing elements within D Guard 23 2 Temperature The use of inherently stable electronics and built in so
69. ideal value Short dabs of the up and down keys should be sufficient to bring the value back into the correct range Each time a change is made the home icon will change to the save icon One a value is saved the icon will revert to the home icon Further changes will again show the save icon The final value must 4 00mA 0 01mA MOHITOR SIGHAL LOOP OUTPUT CURREHT USE UP 7 DOWN KEYS TO SET VALUE To adjust the 20mA output signal place a digital multi meter on the Loop test point pins on the main system board Operate the up or down soft keys to adjust the current loop output value The setting will be fairly sensitive if the current loop value is close the ideal value Short dabs of the up and down keys should be sufficient to bring the value back into the correct range Each time a change is made the home icon will change to the save icon One a value is saved the icon will revert to the home icon Further changes will again show the save icon The final value must be 20 00mA 0 01mA 37 GASTECH AUSTRALIA 12 6 Dynamic Response Time Test Function D Guard The Dynamic Response Time DRT test function allow the operator to perform a check on the actual gas measurement response time for the detector Unlike a static calibration where the adjustments are made to bring the readings to an expected steady state calibrated value DRT dynamically checks the time taken for the gas reading to reach both
70. in each function screen a guided help system provides information on present location within the menu system and guidance on performing the function relating to that menu location The four magnetic user keys are indicated by the four white circles on the front panel Placing the magnetic stylus over these markers operates the key and performs the action that is assigned to it at the time Safety In Hazardous Environments CALIBRATE ZERO MENN Saas ZERO CAN BE MANUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUN AUTO CAL TO START 0 0 mmm Present Location you are here Return Home Start Action Next Location KT SPAN CAL RUN AUTO CAI where this key will take you GASTECH AUSTRALIA Although the function of the keys change based on context there are only a small number of basic key function icons to remember There are also a number of fixed key function locations to simplify navigation to common screens such as the home screen If there is no icon next to a key marker then that key has no effect 11 3 1 Soft Key Functions and Icons ofKeylon Funton Screenlocation Return directly to the home screen Always Top Left coer NNNM N B ee K pe 30 GASTECH AUSTRALIA 11 3 2 Quick Nav Function To save the user from having to navigate past a large number of function screens to get to the desired page a quick navigation system al
71. ine measurement shift either positive or negative Similarly the cell s sensitivity to gas will reduce with a corresponding reduction in output signal for a given gas concentration If left uncorrected eventually the detector will no longer operate reliably in detecting its intended gas In order to maintain accurate and reliable operation the detector must be calibrated at regular intervals Calibration will return the detector to a correct zero gas baseline and re adjust operation to compensate for the reduced cell sensitivity Some environmental standards mandate that detectors must be calibrated regularly if the monitoring system is to remain compliant with its rules GasTech Australia recommends calibration at 3 monthly intervals for a detector operating under normal conditions 12 2 Preparing for calibration The method for calibrating the detector has similarities to bump testing See sections 9 3 to 9 5 To ready the detector for calibration conduct the operations covered in sections 9 3 to 9 5 Unlike bump testing however a minimum target gas level of 25 of full scale must be used for calibration to ensure accurate final calibration and for the detector to achieve its published performance specifications D Guard prevents zero calibrations from being performed if the apparent gas level is greater than 1096 of full scale Span calibrations are prevented if apparent gas concentration is less than 2096 of full scale 32
72. instrument Avoid touching the circuit board with hands or tools e Avoid disturbing the sealing gasket that sits in the groove along the edge of the base section of the enclosure This seal is essential for correct ingress protection Depending on the build of the instrument connection to the main system board can be either direct to the power connector or via a terminal board mounted in the base section of the enclosure Connection directly to the system board connector is suitable for lighter duty cables single or dual screened twisted pair type cables See section 8 6 5 for cable types 20 GASTECH AUSTRALIA 9 6 2 Connection Details Connection Directly To System PCB Cable Plug Positive Supply Input Loop Return V Connection Function 0 0 Positive Supply Voltage Input Loop Return V Current Loop Output Signal Supply Return Shield Noise Protection Connected to Enclosure Connection To Terminal Board Positive Supply Input V Cable Shield or Connection to System Earth connected to conductive plastic enclosure Loop Return V 9 6 3 Cable Entry and Connecting The power cable must enter the base section of the enclosure via the cable gland For connections direct to the main system board pass the cable into the enclosure through the gland and allow enough free cable length to prevent pulling on the power connector when the lid is removed replaced
73. ion while the gas sensors stabilise This reduces unpredictable system behaviour since the detector outputs a low fault current loop value during this phase The connected system can identify that the detector is in a low signal state and act accordingly This start up action is desirable because during the warm up period the detector is essentially off line and not reporting present gas values A numeric counter at the bottom of the display counts down from 60 to as the warm up time elapses After the 60 seconds time period expires the detector moves to its main system read out Home screen GASTECH AUSTRALIA gastech com au System Initialising 42 Initial Start Up Screen B CO 100 PPM STATUS NO FAULTS Detector Home Screen 28 GASTECH AUSTRALIA 11 2 Home Screen Features The Home Screen is the main display that will be visible most of the time during normal detector operation There are a number of functions indicated on the Home Screen in addition to the gas readout User Menu Status Gas Type And Range Gas Concentration Reading Function Indicators Measurement Units Icon Locations STATUS NO FAULTS dnd The main screen shows both permanent and dynamic areas to provide indication of detector status and gas readings 11 2 1 User Menu status Padlock Icon The padlock icon is aligned with the top left user soft key and when present indicates that the menu system is locked Acc
74. ith Backlight Disabled loop at 22mA 900 4 T Loop Resistance 200 4 100 T T T T T T T 1 T 1 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Supply Voltage 18 1 2 Loop Resistance D Guard With Backlight Enabled loop at 22mA 800 4 Loop Resistance 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Supply Voltage 55 GASTECH 2 AUSTRALIA D Guard 19 APPENDIX B 19 1 Relay Board and Sounder Options The D Guard G can be ordered with an optional relay board D Guard R part number 65 1080R xxx which provides the option for standalone operation Additionally The D Guard G can be ordered with an optional relay board and sounder combination D Guard S part number 65 1080S xxx Alarm 2 Siren Jumper Alarm 1 Siren Jumper 19 1 1 Relay Board Functionality SMIALI WAGE YO Siren Connector TA 7 Current Loop Jumper Power Supply and Current Loop Power Supply to Main Detector Board Alarm 2 Relay Fault Relay Alarm 1 Relay 56 GASTECH AUSTRALIA 19 1 2 Table of Functions identified by silk screen legend on relay board and photo annotations Des Connect to positive side of the power supply Connect to an external controller input that has an input shunt sense resistor Connect this to negative side of the power supply Connect to the detector
75. kaged and stored in a safe place Examine all shipping boxes and protective packaging for items attached to them especially if the wrapping are to be discarded 4 2 Inspection Equipment that is found to be damaged or appears to have been modified in any manner must not be used Please contact GasTech Australia if the equipment is suspected to be different than that ordered or if it does not match the published specifications 4 3 Storage Where equipment is not going to be installed immediately proper storage is important to ensure protection against damage Damage incurred during storage could render the equipment non functional Electro Chemical gas sensing cells used in this equipment have a maximum shelf life of 6 months from the date of shipment by GasTech Australia If equipment is stored for periods longer than this the performance of the gas sensing cell cannot be guaranteed by GasTech Australia All equipment should be stored indoors in a cool dry location protected from adverse environmental elements If storing at ground level ensure that the storage area is not an area where water will collect 5 GasTech Australia Contact Details Head Office 24 Baretta Rd Wangara Western Australia 6065 Int Phone 61 8 6108 0000 Int Fax 61 8 9408 1868 Email info gastech com au 10 GASTECH AUSTRALIA 6 GENERAL SAFETY PRACTICES 6 1 Relevant Personnel Ensure all personnel directly respon
76. l Specifications PM 64 25 1 2 Methane Detector Specifications 64 25 1 3 Carbon Dioxide Detector 5 65 25 1 4 Detector 5 esee eene 65 25 1 5 Mechanical amp Environmental Specifications nnns annes nna 65 GASTECH gt AUSTRALIA PROPRIETARY STATEMENT GasTech Australia owns proprietary rights in the information disclosed within By receiving this document the recipient agrees that neither this document nor the information disclosed within nor any part shall be reproduced or transferred to other documents or used or disclosed to others for manufacturing or for any other purpose except as specifically authorised in writing by GasTech Australia COPYRIGHT NOTICE 2014 rights reserved Information contained in this document is protected by copyright No part of this document may be photocopied reproduced or translated to another program or system without prior written authorisation from GasTech Australia TRADEMARK STATEMENT Protected through use and or registration in the United States and many foreign countries are the trademarks and service marks of GasTech Australia The use of the symbol indicates registration in the United States only and the is in A
77. libration values and immediately start to use the new values as the baseline reading Once saved the save icon is replaced by the home icon and the soft key will return the detector back to the main screen if operated Further manual changes will again cause the save icon to be displayed oT USE UP DOWN KEYS TO SET VALUE 56 3 Once in the manual span screen and span gas has been applied the warning messages and icons will extinguish The gas reading can now be adjusted by the use of the up and down soft keys Manual adjustment is best carried out when the trend indicator is sitting in the centre position indication a stable reading home icon will change to the save icon Once the save icon is visible the current manually adjusted value can be saved by operating the save soft key Once the value is saved the soft key reverts back to the home icon Any further changes to the reading using the up or down soft keys will again show the save icon 12 4 6 Isolating the Detector During Span Calibration If during calibration it is required to prevent the current loop signal responding to the applied gas set the detector into isolate mode Refer to section 12 4 2 for information on how to isolate the detector 36 GASTECH AUSTRALIA D Guard 12 5 Current Loop Output Calibration The current loop output signal is not expected to require re adjustment under normal opera
78. lled in a location allowing easy access for repairs adjustments calibration The mounting position must allow visibility of the identification plate e Mount the instrument in a position that will minimise the risk of mechanical damage e Ensure that the gas entry port is clear of obstruction which would prevent the passage of gas into the internal detector cell e Prevent water and dust accumulation from affecting operation by mounting the sensor unit with the gas entry port pointing forwards or downward Do not install the instrument with the gas entry port facing upwards as this may allow the collection of water or dust to prevent gas entering the sensor not leave the splash guard unfitted as this will allow water and dust to collect directly on the sensor surface filter e tisimportant to ensure that any cable entry points to the enclosure are watertight by properly tightening up the cable entry grip e If cable glands are to be substituted they must be replaced by types suitable compatible types and must be both IP66 and IP68 ingress protected to maintain the detectors overall IP rating 9 3 Detector Dimensions and Mounting Orientation Ideal position Recommended Do NOT Mount this way 16 GASTECH gt AUSTRALIA 9 4 Installation Considerations The connections between D Guard and other interconnected equipment must be compatible in terms of voltages power capabilities and input resistan
79. locations where ventilation systems can create pressure pulses 23 4 Humidity The electrochemical cells used in D Guard detectors use an aqueous sulphuric acid electrolyte This electrolyte remains in an equilibrium state of sulphuric acid to water content at a relative humidity of 6096 If the detectors are subject to a relative humidity greater than 60 then the electrolyte will absorb water Conversely if the exposure is to a relative humidity less than 6096 water will be lost from the electrolyte For exposure to dry atmospheres where water is lost from the electrolyte the cell will eventually settle and adopt the new conditions as its operating point Prolonged exposure to dry atmospheres will eventually prevent the cell from operating and will present a fault condition from the D Guard detector Normal sensor operation can be restored by exposure to atmospheres within the 1596 to 9096 RH range Re calibration of the detector will however be required For exposure to a very high relative humidity the cell may not be able to accommodate the increased water volume through absorption and may leak Once leakage has occurred the cell is deemed to have failed and will require replacement It is important that the D Guard detectors are installed and operated in conditions that meet the product specification of 1596 to 9096 RH per the product specification 62 GASTECH AUSTRALIA 24 APPENDIX G 24 1 System Menu Map
80. low a direct jump to the general area of interest no key is pressed the home screen is automatically returned to after 20 seconds Jump directly to functions ALARMS E ENSOR ALARMS Jump directly to alarm setup related to gas measurements functions Quick SELECT A SHORTCUT TO THE SETUP GROUP HEEDED Jump directly to detector feature settings Jump directly to data communication function settings 11 3 3 Entering The Function Screens To gain access to the function screens the stylus must be held on the padlock icon continuously for a few seconds Depending upon whether a pass code has been set the next screen will either be the menu choice bars CAL SET or the screen for entering the pass code Padlock Icon for 2 5 seconds Menu is unlocked NM 100 ___ ENTER PASSCODE 1 USE NEXT DIGIT KEY SELECT DIGIT 2 USE UP DOWN KEYS SET DIGIT 3 USE PADLOCK ICON TO UNLOCK MENU PASSCODE 0 0 0 0 b msn To enter the pass code scroll each digit up or down A padlock icon will show once a code is entered Entering an incorrect code will move the menu back to the main home measurement screen Once unlocked if exited the menu can be re entered without the pass code for 30 seconds after which the menu is again locked and requires the pass code to re enter Once the menu is unlocked two options are available calibration CAL or setup 5 O
81. mmunicator configurator or a system controller HART enabled D Guard detectors are fitted with an IP68 rated connector communications port to allow connection of a field communicator A suitable cable to connect between a standard field communicator and the D Guard is available from GasTech Connections at the communicator are polarity independent To start communications open the communications port waterproof cap and plug the data connector into the port is by default set to polling address O and is set for point to point variable current loop operation D guard does not use Device Description type files and will be discovered as a generic device to a field communicator Once successful communication has been established the HART communication icon will start to flash refer to section 13 1 1 For complete details regarding D Guard HART communications refer to the D Guard HART specification document This document is available from the GasTech Australia website www gastech com au Remove the waterproof cap to access the communications port Note that the detector is rated IP68 ONLY if this cap or the mating connector are in place Without the cap or connector fitted rating is IP66 only 51 GASTECH AUSTRALIA 17 Detector Maintenance Under normal operating conditions D Guard requires minimal maintenance above any scheduled service as set by local site regulations 17 1 Visual Inspection
82. n off During the detectors routine operation internal checks are made to determine of the system is functioning within normal limits If a condition exists within the detector that could create unreliable measurements the system fault OR y y STATUS Ea If the detector reading exceeds the full scale measurement range by 1096 the over range is displayed by four dashed markers in place of the readout Additionally the warning triangle and sensor fault icons are displayed since an over range condition can also be the result of a sensor failure Whilst the fault condition is occurring both icons will be displayed If the fault clears the warning icon remains in place to indicate that a fault log is active icon is displayed The lower status bar indicates a message associated with the fault condition STATUS If the gas sensing element is producing a signal that forces the reading into a negative state possibly due to poor calibration or damage the display will indicate SENSOR LOW SIGNAL in the lower status bar and display both the warning triangle icon and the sensor fault icon 47 GASTECH AUSTRALIA D 556 STATUS During normal operation and during calibrations the detector temperature is compared against an upper limit If this limit is exceeded then a fault message is displayed and the fault icons displayed The fault is also logged in the fault list
83. nally required to temporarily silence an alarm for conditions where an alarm event has been noted and is being dealt with D Guard allows an alarm condition to be silenced for 10 minutes by operating the soft key marked with the ear icon bottom right of the display For detectors with relay contacts the relays will be reset to the non alarm condition for a ten minute duration For detectors with local sounders and flashing beacons using the internal relay contacts these will be switched off for the ten minute period The inverse displayed bell icon will remain on the display to indicate that an alarm event has occurred After ten minutes the alarm state will be re activated if the alarm conditions are still present 50 D Guard STATUS xd UPDATING FAULT LOG DONE MAX TEMP LIMIT MAX CAL TEMP ALARMS OFF 5 If an alarm has been triggered and the detector is set to latched alarm mode the alarms can be cleared by using the alarm clear soft key This is the upper right bell icon with the cross adjacent to it Clearing an alarm must only be done by an authorised person If the conditions that triggered the alarm are still present the alarm will activate again GASTECH AUSTRALIA 16 Connecting A HART Field Communicator For D Guard 2 detectors that are fitted with HART communications interaction with the detector may be done via a HART master communication device such as a HART field co
84. nd influences such as ventilation that affect the rate at which diffusion occurs In most cases over a long enough time the concentration of gas anywhere within the space will have equal concentration However in areas with enclosed spaces with poor ventilation gas may pool in higher concentrations if the rate of gas leakage into the space is greater than the rate of diffusion out of it Pooling can occur in roof spaces for gases that are less dense than air or in pits and tunnels for gases that are more dense than air The various diffusion processes are the mechanism by which gas enters the D Guard in order to be detected Gas molecules will diffuse through the gas permeable waterproof membrane and into the sensor body where they react with specific sensor mechanisms to produce signals proportional to the gas concentration For toxic gases entering electro chemical sensors an electrical current proportional to concentration will be produced For flammable gas molecules entering an infra red sensor infra red energy will be absorbed proportionate to gas concentration This absorption is processed to produce a concentration related signal Signals from the various sensor types feed into the detectors electronics and signal processing software where they are converted to scaled values and used for display indication concentration and alarm signalling signals gas concentration to remotely connected equipment via its two power supply c
85. nded to signal one or more warnings before gas concentrations reach dangerous or harmful levels In order to ensure that the detector s intended function will operate as designed it is essential that the information and instructions presented in this manual are read and understood prior to installing using or maintaining the equipment In particular a thorough understanding of the information relating to configuration operation calibration and maintenance is essential before using D Guard To aid with the process of bringing attention to key points graphical notices are used in this manual These notices are graded based upon the consequence of ignoring or incorrectly applying the information given STOP Warning Significant risk to health and safety with the possibility of serious injury or death A Caution Possibility of unsafe operation of D Guard and connected equipment Warranty of D Guard and connected equipment may be invalidated Note Additional information is provided to assist with understanding of detector operation configuration calibration or maintenance 1 Warnings Cautions and Notes For safety reasons D Guard must be installed operated and serviced only by competent and appropriately trained personnel Reading and understand this instruction manual completely is essential before installing operating or servicing this equipment Failure to install or operate this instrument in accordance with instructions
86. nly be carried out by GasTech Australia service staff or GasTech Australia appointed agents with the appropriate training AY Sensors must only be replaced with the same type Fitting substitute brands of sensor may cause the detector to operate unreliably Fitting sensors of a different type will likely cause the detector to seriously malfunction or become damaged Substituting sensors for non GasTech approved parts or incorrect types will void the product warranty GasTech Australia will not accept liability for any adverse outcomes that may arise as a result of fitting inappropriate sensor types to D Guard 17 3 1 Removing the Detector Main Board To gain access to the sensor follow the steps given below Note ensure that this is only done by suitably trained or qualified person It is strongly advised to wear an antistatic wristband and use an antistatic mat to place the detector PCB onto when working on replacing the sensor Remove the four lid retaining screws e Unplug the power cable from its PCB socket e Lay the detector lid face down and observe the four PCB fixing screws e Remove the four PCB fixing screws and turn the main board over Operate with caution so as not to damage any component or scratch the display A Do not get fingerprints on the display face as these will be difficult to remove 17 3 2 Replacing the Sensor e Unplug the old sensor and replace with a new sensor of identical type e Reverse the process of
87. not reflect a proper comparison against the stored reference timings ai DNE TEST COMPLETE T50 32 2 Seconds FAIL T90 58 6 Seconds PASS K SET 4mA It is possible for one of the tests to fail if the sensors response is no longer close to the typical exponential type curve that gas sensors exhibit Old sensors can be very slow to respond making it possible for the T50 to fail but the T90 to pass Of course a very slow old sensor or badly blocked waterproof membrane could cause both tests to fail 38 GASTECH AUSTRALIA 13 Detector Configuration As supplied to the end user D Guard is configured based on the selected gas type and range For the majority of applications most of these default settings should not require adjustment The system of configuration menu screens works essentially the same way as those used for the calibration functions Navigation uses the same general soft key layout and the format of the screens is the same as for calibration functions The Quick Nav system screen allows a direct jump to the area of interest to save scrolling through numerous pages see section 10 3 2 for use of the Quick Nav function The following configuration sections are provided along with the specific parameters that can be adjusted 13 1 Sensor Configurations SET BRSELINE GURRD BRND SET DETECTOR FULL SCRLE RERDING SELECT GAS TYPE AND RANGE SET CALIBRATION GAS CONCENTRATION SELECT
88. of times before stopping 35 GASTECH AUSTRALIA ___ _ __ 1 USE UP DOWN KEYS TO MANUALLY ADJUST ZERO 56 6 CAL HOT POSSIBLE SEHSOR TOO HOISY MAHUAL SPAH If D Guard has determined that an auto span is not possible the up and down soft keys will become enabled allowing a manual span adjustment to be made It is important to note however that a span set manually due to a noisy sensor will have to be based on best judgment of where the reading actually lies amongst noisy readings Once a change is made to the readings by the up and down soft keys the save settings icon will be shown see next screen 12 4 3 Manual Span Calibration AUTO SPAN UT APPLY 50 0PPM SPAN GAS 0 0 8 APPLY SPAH GAS TO SEHSOR MANUAL SPAH AUTO CAL When entering the span calibration functions the auto span page is the first one entered Operate the Manual Span soft key to move on to the manual span calibration pages 77 BES 1 E UU USE UP 7 DOWN KEYS TO SET VALUE 90 0 K AUTO SPAH BERLE Each time either the up down soft key is pressed the D Guard pom USE UP DOWN KEYS TO MAHUALLY ADJUST SPAH 50 0 Once an auto span has successfully completed or a manual change is made due to a noisy sensor preventing auto span from occurring the save icon will show in the top right soft key location Operating the save key will store the span ca
89. oint operation If the detector is operating in multi drop mode the fixed current loop value is indicated The system configuration screen allows configuration of the detector in a general sense such as detector isolation SENSOR ALARMS Quick Nay SELECT A SHORTCUT TO THE SETUP GROUP HEEDED II VO M SYSTEM To access the SYSTEM data setup unlock the menu and operate the SYSTEM soft key 15 1 USE UP DOW KEYS TO SET ON OFF Detector NOT ISOLATED The default state for isolation is OFF Use the up or down soft keys to toggle the setting between NOT ISOLATED and ISOLATED PARAMETERS AVAILABLE TO CONFIGURE OUTPUT ISOLATE TEMPERATURE SENSOR SCREEN COLOUR INVERT SENSOR COMPENSATE TEST SET SENSOR GAIN SELECT SETTINGS KEY MODIFY OX The main SYSTEM setup page displays the features that may be configured by the user Operate the SETTINGS soft key to start configuration 1 USE UP DON KEYS TO SET ON OFF 2 USE THE FILE KEY TO STORE CHANGES Once a change is made the save icon will show Operate the save soft key to commit the changes to configuration memory When isolated the output current is fixed at 3 3mA The main measurement screen indicates a clear message that the detector is in isolate mode 45 GASTECH AUSTRALIA D Guard A USE UP 7 DOWN KEYS SET V
90. on of areas of possible pooling or areas near a point of release that leaked gas will initially move towards Gas Density kg m STP 101 3 15 _ Relative Density Air 1 0 Heavier or Lighter Than Air Aro 225 2 154 101 3kPa 0 C Table 2 Absolute and Relative Densities of Common Gases Referenced Against Air Absolute densities are given at STP 101 3kPa 159 unless otherwise noted 19 GASTECH gt AUSTRALIA 9 6 Electrical Connections D Guard requires only two connections to be made in order for it to function These two connections convey input power and return the process related current signal The functions of both power supply and signalling are therefore carried out over the same pair of wires For D Guard variants with HART communications the digital signal also uses the same two wire connections 9 6 1 Field Terminal Access Access to the D Guard field terminals involves opening the enclosure which is achieved by undoing the four corner lid screws using a 4mm Allen Key The main electronics are fixed to the front panel Lid of the enclosure and the input power and loop return connection is located to the bottom right of the circuit board as viewed from the rear of the board shown in the diagram below A Removing the lid of the enclosure exposes a number of critical system elements that must be treated with care in order to maintain the operational integrity of the
91. on the specific application but as a rule the cable shield should be connected to earth system ground reference point at either the detector or the controller but not at both In most typical applications the shield will be connected to an appropriate ground point at the controller end The D Guard detector has provision for connecting the cable shield using the middle screw terminal on the terminal board barrier terminal connector This connection point is electrically connected to the detector enclosure which has conductive elements embedded within the plastic material AY The electrical conductivity of the enclosure is low and may under certain mounting conditions contribute to the creation of noise loops if the cable screen is connected at the controller side of the installation and also to the barrier terminal middle shield terminal This may arise if the detector is mounted on a metal plate which is also connected to the system ground If connecting the screen to both the controller side and the shield terminal of the detector the detector enclosure may need to be isolated from system ground Typical suitable cable types for installing D Guard would be Type 25 e g Olex MCFR58AA004 OR twin twisted pair data cable such as Belden type 9829 22 GASTECH gt AUSTRALIA 9 6 6 Cable Gland The cable gland fitted to the D Guard detectors is a 20mm type rated to IP66 and IP68 The gland rating is matched to the enclosure in te
92. ondition that caused it to trip has subsided An unlatched relay will immediately return to its default state once the gas event causing the trip to occur has dropped below the trip point A latched relay will remain in the alarm state until a manual reset action is carried out The default state is Non Latched Use the up or down soft keys to toggle the setting between NON LATCHED and LATCHED 43 GASTECH AUSTRALIA A1 LATCHING 1 SET RELAY LATCH ING HOH LATCH 2 USE THE FILE KEY TO STORE CHANGES Mode LATCHED K PARAMETER Once a change has been made the BACK arrow icon will be replaced by the save icon Operating the save soft key will commit the changes to the detector s configuration memory Once saved the back arrow icon will once again show Making further changes will return the back arrow icon to the save icon Use the NEXT PARAMETER soft key to move back to the first Alarm setting Alarm Trip Level 13 3 Digital Data Configuration D Guard en 2 TRIP LEVEL 50 0 PPM HYSTERES IS 1 0 OF SCALE RISE FALL RISE DEFAULT STATE EHERGISED LATCH MODE HOH LATCHED SELECT SETTINGS KEY TO MODIFY SETTINGS SE All settings for Alarm 1 also relate to Alarm 2 and are adjusted in the same way as described for Alarm 1 Alarm 2 settings can be accessed from the Alarm 1 current settings screen or by operating the NEXT arrow soft key
93. onnections It does this by varying the amount of current it draws from the power supply in direct proportion to the gas concentration measured This is generally referred to as current loop signalling and commonly uses 4mA to represent zero gas conditions and 20mA to indicate full scale D guard can also signal gas concentrations along with other data using a digital communications system called HART Highway Addressable Remote Transducer Transmitter This digital signal is super imposed onto the current loop 4 20mA signal Additionally D Guard can optionally provide volt free relay contacts that can be programmed to respond at user set gas concentrations Gas concentration values and other information is also presented on the display for localised reading Sensor operating errors are also signalled via a current loop level above or below the normal 4 20mA range 14 GASTECH AUSTRALIA 9 INSTALLATION 9 1 Installation Considerations The D Guard Toxic Gas detector would generally be part of a larger system and be connected to other components or equipment within it These other pieces of equipment would generally provide the function of signal acquisition decision making shutdown control and indication PLC s fan controls beacons sirens SCADA systems D Guard can also be used as a standalone instrument as part of a mini system using alarm type devices connected directly to its relay terminals Whichever
94. p and down keys to increment or decrement the numeric digit Use the next key to select the next digit to change 14 D Guard 7 SET PASSCODE SET MENU PASSCODE 1 USE NEXT DIGIT KEY TO SELECT DIGIT 2 USE UP DOWN KEYS TO SET DIGIT 3 USE SAVE FILE ICON TO STORE PASSCODE 2 1 0 D KSE NEXT DIGIT Once a digit is changed the save icon will show to allow the change to be recorded Selecting another digit or changing the value of the current digit will change the save icon to the back icon The saved passcode should be noted down for safe keeping since access to the user menu is not possible if the security system is active and an incorrect passcode is entered Detector Messages and Warning States During normal detector operation the display indicates gas concentration values and additionally other operational information such as sensor temperature gas measurement units and communication status Under conditions where a detector fault or a measurement error has occurred the display will indicate the condition with a status message and icons 14 1 22 4 C STATUS NO FAULTS Running Information and Fault Messages 100 PPM 22 4 C STATUS NO FAULTS The digital communications Icon alternates between off and on whilst data packets are being received AND transmitted successfully If received or transmitted data packets fail or if communication is not active the icon will tur
95. perating the SET soft key moves to the quick nav screen described in section 10 3 2 31 GASTECH AUSTRALIA 12 Calibration 12 1 Why Calibrate All electro chemical gas sensing cells have a finite service life Through reactions with ambient atmosphere that may contain contaminants and in some cases to target gas the internal electrodes slowly become less active and efficient In operating conditions where the cell is not exposed to its target gas other than for calibration purposes and the surrounding environment does not contain volatile organic compounds VOC the cell should operate reliably for around 18 to 24 months Regular exposure to non clean air or VOC s will shorten the cells lifetime The reduced lifetime will depend upon the frequency and nature of exposure to ideal clean air conditions Once a cell has reached the limit of its lifetime it must be replaced see maintenance section For Infra Red type sensors the process of performance degradation is much slower and is generally related to changes in the characteristics of the optical components used to measure the gas concentration Occasionally detector operation in a harsh environment can cause stress to the optical components causing a shift in its performance For all sensor types as a result of its aging mechanism gas proportional electrical outputs will degrade from the levels they were when new This signal degradation can be observed as a basel
96. rms of protection against moisture ingress In order to maintain the integrity of the detector housing it is vital that the cable gland is used properly Proper use includes feeding only a single cable through it and that the cable sheath is at least 5 5mm in diameter The gland nut must be fully tightened to form a seal between the gland s sealing sleeve and the cable sheath Multiple cable feeds through the gland and or improper tightening of the gland nut can result is water ingress into the enclosure The presence of water within the enclosure may cause extensive damage to the electronics resulting in a dangerous system failure and voiding of product warranty 9 6 7 Refitting The Detector Cover Once the electrical connections have been made to the instrument the front cover lid must be refitted correctly to maintain the IP66 68 ingress protection rating The enclosure base is fitted with a sealing gasket that is located in a groove that runs around the perimeter of the opening Before replacing the cover check that the gasket is present and seated correctly in the groove The gasket must not be twisted stretched or out of the groove at any point If the lid is replaced onto a faulty or misaligned gasket the ingress protection is likely to be compromised with resulting instrument failure possible Align the cover with the base section and slowly tighten up the four corner screws Initially tighten the four screws loosely so the lid
97. rs can draw full scale current for the first few minutes of operation whilst the gas sensing cell settles This will present a greater than normal load demand on the power supply An under rated power supply and or poor cabling can create voltage drops between the power supply and the detector This situation is made worse when numerous detectors share the same cable run e powered power supplies correct and stable allow the system to settle for at least 1 hour e detector display should be on Displayed information includes gas type and range status messages and gas reading The gas reading should be showing either a stable zero or a value representative of the sensor cell as it stabilises Initially this may be a full scale or negative reading The status message may be indicating a sensor low fault or over scale message These are normal conditions that can be expected for the first few minutes after power up At the end of the 1 hour period however the detector display must be indicating zero or close to zero and status messages must indicate that there are no faults or alarms 24 GASTECH 10 2 2 AUSTRALIA D Guard Observe the system readings derived from the detector s current loop output signal and check that they are as expected For instruments other than those monitoring oxygen the current loop signal level should be near 4 00mA no background gas present Oxygen monitors will have a baseline signal curren
98. sible or involved with installation operation and maintenance of the equipment make reference to this manual in conjunction with any relevant risk assessments conducted to identify and minimise potential hazards 6 2 Safety Communication safety instructions usage conditions and restrictions given within this manual must be communicated to all users These requirements are necessary to identify and control potential risk associated with possible misuse or incorrect application of this piece of equipment In the event of damage or malfunction to the detector that results in the potential to compromise the health and safety of any personnel the owner operator should notify the manufacturer immediately 6 3 Safe Use of Equipment Equipment as supplied has been manufactured within the controls of relevant International and or Australian Standards and state legislative requirements Equipment identified within this manual has been designed for a specific purpose therefore any modification or damage to it must be reported to the manufacturer to allow for repair or replacement The instructions within this manual must be observed as an aid towards achieving maximum safety during operation 6 4 Modifications to Equipment STOP Modifications to the design or construction of this equipment is not permitted under the conditions of its warranty 6 5 Equipment Knowledge Experience in the use of and a technical understanding of this equipment
99. sponsibly disposing of D Guard2 you will be helping to minimise the possibility of negative environmental and human impact which could otherwise be occur through incorrect disposal of this product 54 GASTECH AUSTRALIA 18 APPENDIX 18 1 Output Current Signal Total Loop Resistance vs Power Supply Voltage The maximum total current loop load resistance that can be driven by D Guard depends on the voltage supply fed to the detector This total resistance includes all aspects of an installation such as barrier resistance cable resistance length and the value of the sense resistor used at any connected controller s input channel The operator is advised to account for all of these system resistances and provide a source of power supply that will allow the detector to operate safely with the ability to drive the loop to 22mA fault signalling Incorrect allowance for system resistances and power supply voltages may result in the detector being unable to correctly signal the measured gas concentration The graphs below shows the relationship between detector power supply voltage output and maximum loop resistance for both Group and Group II versions of D Guard Note that there are two graphs for each type since the detector can be configured prior to installation to use the display backlight or not disabling the backlight allows a wider range of supply voltages and loop resistances 18 1 1 Loop Resistance D Guard W
100. ssly negatived and excluded b the Company shall be under no liability to the Purchaser for any loss including but not limited to loss of profits and consequential loss or for damage to persons or property or for death or injury caused by any act or omission including negligent acts or omissions of the Company or the Company s agents wherever occurring arising from the subject matter of this agreement c the Purchaser shall indemnify the Company against any claims made against the Company by any third party in respect of any such loss damage death or injury as is set out in sub paragraph b hereof the Purchaser further agrees to indemnify the Company against all losses and expenses which the Company may suffer or incur due to the failure of the Purchaser fully to observe its obligations under this contract and d no warranty is given and no responsibility is accepted by the Company to ensure the Equipment supplied complies with any statutory requirements relating to the marketing of goods Compliance with such legislation shall be the sole responsibility of the Purchaser e the Company specifically denies any liability for the overall performance of any plant or the results of any process with which the Equipment is integrated GASTECH AUSTRALIA Manual Conventions D Guard is designed to detect depending upon which sensor type is fitted flammable gases and vapours oxygen concentration or toxic gases The detector is inte
101. t A fault message and icons are displayed if the detector is operated or calibrated beyond this limit SENSOR LOW GAIN STATUS 5 Each time the detector is span calibrated a check of the sensors gain performance is made If the sensor has reached a point where unstable readings are possible a fault message and icons will be displayed The fault is also logged in the fault list The actual sensor life remaining can be viewed on the detector information screen This fault is cleared by changing the sensor re calibrating the detector and resetting the sensor life counter e INFORMATION DGURRD 2 2 HIRE SERIRL NUMBER 10800078 RSSY DRTE 07 08 15 HARDWARE REV 1 0 CODE REV 1 08 0415 MANUFACTURER GASTECH AUSTRALIA PHONE NUMBER 61 8 6108 0000 SENSOR LIFE REMAINING 100 The detector information screen contains the units serial number the date of manufacture hardware and firmware revisions and GasTech Australia company information INFORMATION DGUARD 2 2 WIRE SERIAL NUMBER 10800078 ASSY DATE 07 08 15 HARDWARE REV 1 0 CODE REV 1 08 0415 MANUFACTURER GASTECH AUSTRALIA PHONE NUMBER 61 8 6108 0000 SENSOR LIFE REMAINING 0 This screen also indicates the sensor life remaining Once a sensor has expired and been replaced the life counter can be reset by using the detector icon at the top right of the screen GASTECH AUSTRALIA If the detector
102. t at approximately 17 37mA to 17 38mA If the controller system has measurement scaling applied to the detector s current loop signal then the 4mA baseline current would represent 0 00 for all detector types except oxygen For oxygen monitors the readings should equate to around 20 996 volume Check that the detector readings are stable and representative of expected surrounding gas concentrations If problems are observed during the commissioning process they must be addressed before the installation can be completed and the detector put into service Performance Checks After the installation has been verified and the system has been powered up for at least 1 hour ideally several hours allow the sensors to fully settle a bump test to verify the detector s response to target gas must be carried out m A 10 3 Bump testing must only be carried out by suitably trained personnel under permitted site conditions Carrying out bump testing using non approved or site inappropriate equipment could create a hazard situation and increase the risk of injury All equipment must be approved for use at the site area where the detector is installed and must be used only as instructed in its operational manual by appropriately trained personnel Bump test procedures involve the use of toxic gases The gas concentrations used for test and calibration purposes are considered non harmful over the time period for which testing is likely to occur
103. the sensor processing electronics may be adjusted to 7 different values As supplied the gain is optimal for the sensor fitted and the gas range selected USE UP DOWN KEYS TO SET VALUE 1 USE UP DOWN KEYS TO INVERT DISPLAY 2 CHRNGED STRTE 15 NOT STORED INVERTED Screen K COMPENSATION 5 5 USE UP DOWN KEYS SET VALUE 1 USE UP DOWN KEYS SET ON OFF 2 USE THE FILE KEY STORE CHRNGES Compensation OFF Changing to sensor types other than those supplied by GasTech Australia may require that compensation be turned off to achieve optimal performance SET SENSOR GAIN USE UP DOWN KEYS SET VALUE 1 USE UP DOHN KEYS SELECT GRIN 2 USE THE FILE KEY STORE CHRNGES Gain Setting 4 p 4 SELF TEST Changing this setting requires an understanding of sensor signal levels Please consult GasTech Australia for advice on when and how to set this parameter 46 GASTECH AUSTRALIA SET PASSCODE SET MENU PASSCODE 1 USE NEXT DIGIT KEY TO SELECT DIGIT 2 USE UP DOWN KEYS TO SET DIGIT 3 USE SAVE FILE ICON TO STORE PASSCODE 0000 b mun Access to the detector s menu system can be protected via the use of a 4 digit passcode The default passcode is 0000 which disables the protection Setting any other number than 0000 will enable the protection system Changes made here are automatically saved Use the u
104. ting conditions If however setting is required the following procedure describes the process ZERO MAHUALLY SET AFTER AUTO ZERO COMPLETES PRESS RUH AUTO CAL TO START 0 0 mmm K SPAH CAL RUN AUTO CAL MAHUALLY OR AUTO CALIBRATE DETECTOR 5 CALIBRATIOH GAS VALUE MUST BE SETUP PRIOR TO USING AUTO CALIBRATIOH SEE GAS SETUP MEHUS SELECT SETTIHGS KEY TO START SETTINGS From the zero calibration page operate the Span soft key The second screen is span calibration to move on to the next screen span calibration page Operate the DRT soft key to move to the next screen DRT a APPLY 50 0PPM SPAN GAS T50 The third screen is the DRT function screen Operate the SET 4mA soft key to move to the 4mA calibration screen MOMSEN a Sa Sa MOHITOR SIGHAL LOOP OUTPUT CURRENT USE UP 7 DOWN KEYS TO SET VALUE K SET 2014 From the 4mA calibration screen operate the 5 20mA soft key to move to the 20mA calibration screen NMSZYNEEENEGETINE 1 MOHITOR SIGHAL LOOP OUTPUT CURREHT USE UP 7 DOWN KEYS TO SET VALUE To adjust the 4mA output signal place a digital multi meter on the Loop test point pins on the main system board Operate the up or down soft keys to adjust the current loop output value The setting will be fairly sensitive if the current loop value is close the
105. ttoh torto 31 12 CALIBRATION c E 32 121 WAY CAUBRATE nest 32 12 PREPARING FOR CALIBRATION m 32 12 9 ZERO CAUIBRATION Me 33 CE MEME DES m 33 12 4 2 Saving the Zero Calibration Valle eni tas 34 T233 Goo o gio 34 123 4 Notes Oh Zero CADAN UFU 34 MEE e ipe m 34 Aulo Span COO OE OD T 35 12 4 2 Saving Auto Span Calibration 36 124 3 _ 36 12 4 4 Performing a Manual Span nnns naa nnns 36 12445 Sving SION CO HOON _ ______ 36 12 4 6 Isolating the Detector During Span Calibration sees 36 12 5 CURRENT LOOP OUTPUT CALIBRATION tuu tha tre Fh RM Fate E e 37 12 5 1 Setting the 4mA Output Current isse eee tera aea easy aea e ea Na Va a ye 37 12 5 2 Settling the 20mA output CUrFrehl eise t aa Ear EET REER 37 12 5 DYNAMIC RESPONSE TIME TEST
106. ustralia registrations may not have been issued at present in other countries other product names and logos are trademarks of their respective owners DISCLAIMER Under no circumstances will GasTech Australia be liable for any claims losses or damages resulting from or arising out of the repair of or modification to the equipment by a party other than GasTech Australia or its authorised service representatives or by operation or use of the equipment other than in accordance with the printed instructions provided by GasTech Australia or if the equipment has been improperly maintained or subject to neglect or accident Any of the foregoing will void the warranty REVISIONS TO MANUAL While every effort has been made to assure the accuracy and clarity of this document GasTech Australia assumes no liability resulting from any omissions in this document or from misuse of the information obtained herein The information in this document has been carefully checked and is believed to be entirely reliable with all of the necessary information included GasTech Australia reserves the right to make changes to any products described herein for the purposes of improved reliability functionality or design and reserves the right to revise this document and make changes to its content as may become necessary with no obligation to notify any persons of revisions or changes GASTECH AUSTRALIA SERVICE POLICY GasTech Australia maintains

Manual (non-certified version)

Contents

Download Pdf Manuals

Related Search

Related Contents