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MSA Senscient ELDS 1000 series, Operating Manual

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MSA Senscient ELDS 1000 series Operating Manual Download Page 109

Functional Testing 

 

Senscient ELDS™ 

Rev 15 

 

109 

 

GB 

5.1.1  Harmonic Fingerprints™ 

In an ELDS Transmitter the drive current applied to the laser diode(s) comprises two components, 

a DC bias component which sets the mean operating wavelength of the laser diode(s), and a pure 

sinusoidal component which modulates the wavelength of the laser diode(s). Continuous 

registration of the wavelength(s) of the Transmitter’s laser diode(s) is achieved by passing a small 

fraction of the laser diode output(s) through a retained sample of target gas(es) inside the 

Transmitter, and measuring the resulting signals from a reference detector (See below). 

 

Transmitter: Gas Reference Channel

 

Using the signal reaching the reference detector through the retained gas sample, the 

Transmitter’s microcontroller is capable of determining the precise bias and wavelength 

modulation components that need to be applied to the laser diode(s) in order to ensure that 

absorption of the laser diode’s optical radiation by target gas always produces a Harmonic 

Fingerprint.  

A Harmonic Fingerprint is a set of harmonic components introduced by target gas absorption, in 

which the relative amplitudes and phases of the components are known and specific to the target 

gas absorption line that is being scanned by the ELDS Transmitter. When the laser diode drive 

conditions in an ELDS Transmitter are maintained such that target gas absorption always 

produces a Harmonic Fingerprint, the Transmitter is said to be maintaining Harmonic Fingerprint 

Lock. 

Summary of Contents for Senscient ELDS 1000 series

Page 1: ...Operating Manual Senscient ELDS 1000 2000 Series Open Path Cross Duct Gas Detectors A 5170 0 Rev 15 ...

Page 2: ...ufacturer Senscient Ltd Units F1 F4 Arena Business Centre Holyrood Close Poole Dorset BH17 7FP United Kingdom MSA 2017 All rights reserved Read and understand this Instruction Manual before installing operating or servicing ELDS 1000 2000 Series OPGD systems ...

Page 3: ...moved from any hazardous location area in which they are installed and returned to Senscient Other than the rear cover providing access to the terminals for connection purposes the units are not intended to be opened during operational service 8 Test gases may be toxic and or combustible Refer to Material Safety Data Sheets for appropriate warnings and handling procedures precautions 9 Do not dril...

Page 4: ...bility for installation and or use of its equipment if this is not done in accordance with the appropriate issue and or amendment of the manual The purchaser should make Senscient aware of any External effects or Aggressive substances that the equipment may be exposed to 2 The user of this manual should ensure that it is appropriate in all details to the exact equipment to be installed and or oper...

Page 5: ...ity for any errors or omissions in our documents or their consequences Senscient would greatly appreciate being informed of any errors or omissions that may be found in our documents To this end we request that if you believe there are any errors or omissions please send us an e mail at info senscient com describing the error or omission so that we may take the appropriate action ...

Page 6: ...duction 31 3 2 Siting and Mounting 32 3 3 Electrical Connections 44 4 Installation Commissioning 56 4 1 Unpacking an ELDS 1000 2000 Series System 56 4 2 Installation Procedure 59 4 3 Alignment 64 4 4 Cross Duct Alignment Requirements 79 4 5 Commissioning Using SITE 83 4 6 ELDS Bluetooth Wireless Connection 103 4 7 Installation Checklist 105 5 Functional Testing 108 5 1 Introduction 108 5 2 SimuGas...

Page 7: ... 144 11 Appendix B Accessories Spare Parts 145 11 1 ELDS Accessories Spare Parts 145 12 Appendix C Functional Testing Using Gas 147 12 1 Introduction 147 12 2 Testing with the Gassing Cell 147 12 3 Testing Cross Duct ELDS Systems with the Refillable Gas Test Cell 153 13 Appendix D Manufacturer s EC Declarations 158 14 Appendix E HART Communications 161 14 1 Overview 161 14 2 Electrical Connections...

Page 8: ...sition Hydrocarbon gases such as methane and propane absorb in the infrared region of the spectrum If a cloud of target gas is present the specific wavelengths of the infrared laser light output by the ELDS Transmitter are absorbed by the gas introducing Harmonic Fingerprints onto the signals reaching the Receiver that are proportional to the amount of gas in the beam The Senscient ELDS Transmitte...

Page 9: ...nsation The Transmitter and Receiver units incorporate heated optics designed to minimise the build up of humidity condensation snow or ice on the glass lens windows that could otherwise obscure the optics in extreme conditions Both the Transmitter and the Receiver are microprocessor controlled with advanced self diagnostics and fault finding facilities Local communication between an operator tech...

Page 10: ...es hazardous or unsafe practice which could result in severe injury or death to personnel CAUTION Indicates hazardous or unsafe practice which could result in minor injury to personnel or product or property damage Provides useful helpful additional information If more information beyond the scope of this technical manual is required please contact Senscient ...

Page 11: ...d in the Senscient ELDS There are several operating ranges of Senscient ELDS gas detector e g Series 1000 CH4 0 1000ppm m 0 1LFL m 5 40m 40 120m 120 200m Series 2000 CH4 0 1LFL m H2S 5 60m Series 1000 XD CH4 0 10 LFL 0 25 LFL 0 100 LFL 0 5 5m Series 1000 Ethylene 5 60m 40 120m 120 200m Series 1000 HF 5 60m 60 120m Series 1000 HCl 5 60m Series 1000 NH3 5 40m 40 120m Series 1000 CO2 5 40m 40 120m Re...

Page 12: ...ontrolled divergence beams of infrared laser light from solid state laser diodes The outputs from the laser diodes are partially collimated using a faceted lens the facets of which introduce the controlled divergence that is necessary to reduce system alignment sensitivity The Transmitter operates continuously THE TRANSMITTED LASER BEAM IS CLASS 1 EYE SAFE PER IEC 60825 The Transmitter contains a ...

Page 13: ...rates an advanced Automatic Gain Control AGC system that enables it to compensate for the wide range of signal levels that can be received due to effects arising from rain fog snow dirt etc This enables the ELDS 1000 2000 Series to continue operating reliably in the harshest conditions that are likely to be encountered at Oil Gas installations around the world The solid state InGaAs photodiode det...

Page 14: ...ket The adjustable mounting brackets for the ELDS 1000 2000 Series are Purpose built for the Transmitter and Receiver Provide coarse and fine adjustment for quick simple system alignment Rigid stable and robust Made from 316L stainless steel The coarse horizontal adjustment facility enables a Transmitter or Receiver to be quickly pointed in the approximate direction of its counterpart and provides...

Page 15: ...limates and is fitted along the mounting bar on the top of each ELDS unit This sunshade s position is adjustable in order to facilitate use of the alignment telescope or provide easier access to the electrical connections inside the terminal compartment The standard sunshade is fixed by a single retaining screw as illustrated Loosen this in order to allow adjustment of the position of the sunshade...

Page 16: ...ided The enhanced sunshade is fitted above the mounting bracket attached to the same pole wall or mounting structure that the mounting bracket is attached to see illustration below Depending upon the particular details of the installation it may be necessary to temporarily remove the enhanced sunshade in order to gain access to the terminal compartment or use the alignment telescope Make sure to r...

Page 17: ...are thin 2 6 1 Standard Cross Duct Mounting Plate The standard 400mm x 400mm mounting plate substantially spreads the weight load and provides localised reinforcement of the duct wall and is therefore recommended for use wherever possible and in particular on thin walled ducts 2 6 2 Small Cross Duct Mounting Plate The small 250mm x 250mm mounting plate is capable of being mounted on smaller ducts ...

Page 18: ...de compensation for such bending NB Customer user should retain the original installation s internal plates to which this retrofit mounting plate will be attached The installation Design Authority is responsible for ensuring that the method chosen for mounting Cross Duct ELDS units on the intended duct is sufficiently rigid and stable Alignment adjustment bushings are available from Senscient Part...

Page 19: ...vided by Senscient to enable the installation commissioning and testing of all types of ELDS OPGD products and is supplied pre installed on ATEX or CSA UL certified industrial computers Due to the complexity of the computing and communications technologies employed by SITE Senscient can only provide support to users that are running SITE on factory tested and approved platforms SITE is capable of ...

Page 20: ... selected for operations initiated by the Config Event Log and Installation buttons An outline description of these functions is provided in the following sections however more detailed information is also provided in later sections of this document as individually detailed below Note that the SITE version is presented at the top of the screen 2 6 15 13400 in this example When SITE first starts th...

Page 21: ... or via a Wireless RF Bluetooth link the appropriate option is initiated by selecting the required radio button selector The additional Modbus option is provided to allow units that are configured for Modbus operation to be reverted back to ELDS communication over the RS485 this is necessary in order to utilise any other facilities within SITE to maintain or inspect a unit via the RS485 link Once ...

Page 22: ...ct the appropriate unit to be installed TX or RX before selecting the Installation option 2 7 4 Test Diagnostics The Test Diagnostics button provides access to key information and test functions regarding the connected ELDS unit s These functions are described in detail in section 7 2 with specific information regarding the Receiver and Transmitter being in sections 7 2 1 and 7 2 2 respectively Th...

Page 23: ...bout the unit and SITE version is presented along with the time of the download based on the internal time in the ELDS unit as well as an indication of the events selected In this example the display has selected read 50 events from the unit however the total number of events available is 57 Note that ELDS units can hold up to 186000 events this is a rolling buffer so once it becomes full the olde...

Page 24: ...able area as illustrated here Each event has an ID number which is effectively an index to the event number within the ELDS unit a Date Time field which indicates the time that the event was created a general Description field and for some events also a Detail field The System column refers to the event class as is identified by the View Options above Some events within an ELDS unit relate to syst...

Page 25: ...If further events are not available then the appropriate button will be greyed and unavailable Output Options The contents of the Event display can be output saved to allow them to be incorporated into other PC applications or to be supplied back to Senscient Pressing the Save button bottom right of the Events screen will output the data in an internal format that can be used by Senscient to exami...

Page 26: ... Disabled indicates if Bluetooth communication is currently facilitated on the unit By default all ELDS units are shipped with Bluetooth communication active however some customers may choose to inhibit this communication protocol for security reasons The Bluetooth support can be disabled or enabled as appropriate by checking the associated checkbox In the example above the Bluetooth is currently ...

Page 27: ...ich will be signalled over the 4 20mA current loop A description of the configuration of this is provided in section 4 5 2 item 8 therein This tab provides repeat access to this facility should the original arrangement require adjustment at a later time MODBUS MODBUS support is available from all current ELDS units and is also historically supported for most units Units are not shipped with MODBUS...

Page 28: ... occur For older ELDS units the SimuGas time can be selected over the range Midnight 0 hours 0 minutes to 03 00 am 3 hours 0 minutes Units with firmware versions 002 010 018 or later will support SimuGas at any time of the day The time can be specified in 10 minute increments When any change is made the Apply button will become enabled and will write the required changes to the unit if clicked For...

Page 29: ... unit This snapshot may take up to 2 minutes to acquire and will be automatically uploaded to the Senscient service server if an internet connection is available In addition the snapshot is stored on the PC running SITE and may be copied from there The snapshot will be located in the following location within My Documents Senscient SITE Log nnnn Here nnnn represents the unit serial number of the E...

Page 30: ... addition may correct issues that might arise Backup This provides the option to create a zip backup of the current SITE installation information This is located in the following location within My Documents Senscient SITE SBU and takes the form of a zipped folder which contains a record of the units that have been installed by SITE on the PC There is also an option to Purge the current configurat...

Page 31: ...lation for Senscient ELDS it is strongly recommended that the installation design authority reads and understands this chapter and considers how the information and recommendations provided can be applied to their installation s If a design authority has any queries concerning their installation design they should contact Senscient or their local agents Senscient is committed to ensuring that cust...

Page 32: ...al leak sources and any known or likely sources of ignition For natural gas beam path parallel to the ground floor and above the height of most of the valves and flanges in the vicinity For toxic gases beam path parallel to the ground floor at breathing height 1 4m 1 7m For gas mixtures significantly denser than air beam path parallel to the ground floor and below all potential leak sources For ga...

Page 33: ...ll not be melted until the ambient temperature rises If long term outdoor operation in very cold climates is intended it is recommended that extra shielding covers are employed to prevent snow ice from being blown onto the windows and building up Deluge and Flooding Senscient ELDS OPGDs are rated IP66 67 and as such will not be damaged by occasional deluge or flooding However during such instances...

Page 34: ...tor Series Type Path length between units 1000 CH4 5 40m 40 120m 120 200m 1000 Ethylene 5 60m 1000 HCl 5 60m 1000 NH3 5 40m 40 120m 1000 CO2 5 40m 40 120m 1000 HF 5 60m 60 120m 1000 XD Cross Duct 0 10 LFL 0 25 LFL 0 50 LFL 0 100 LFL CH4 0 5 5 0m 2000 CH4 H2S 5 60m 2000 H2S 0 100ppm m 5 60m 2000 H2S 0 250ppm m 5 60m 2000 H2S 0 500ppm m 5 60m The beam path and immediate surrounds should be kept free...

Page 35: ...d When selecting locations for ELDS units ensure that only one ELDS Transmitter unit is within the field of view and pointing towards any ELDS Receiver unit Do NOT run ELDS beam paths such that there are multiple Transmitters running along the same axis because the Receiver at the end of the run will see laser signals from all of the Transmitters on this axis and this may cause problems Detailed g...

Page 36: ...aximum movement of the supporting structure under all anticipated operating conditions must be 0 5º If no suitable mounting structure already exists then structures similar to that shown below are recommended The pipe can be filled with concrete to provide extra stability if necessary 100mm to 150mm 4 to 6 dia steel pipe nominal 6mm wall thickness up to 3m 500mm minimum 500mm minimum Concrete foun...

Page 37: ...ar structure as is illustrated below 3 2 7 Orientation Senscient ELDS OPGDs are solar immune and therefore there is no need to take account of the sun s movement when considering orientation When positioning the units do not install them with the optical axis at an angle greater than 45º to the horizontal to avoid dirt water build up on the lens windows ...

Page 38: ...S system is to be installed must be flat and parallel to each other to within 2 5 per side Provided that this requirement is met it is then a simple matter of mounting each half of the Cross Duct ELDS system directly opposite its counterpart Self adhesive templates 01 1389 D are provided to assist with the location and drilling of suitable holes in the duct wall The most important requirement for ...

Page 39: ...ded to assist the installation designer in those instances where they are 1 In general the flow in ducts is not turbulent and approaches laminar flow throughout the majority of a duct s length 2 In general louvers and grills at duct inlets do not create significant flow turbulence and do not produce significant mixing of air or other gases entering a duct 3 As a consequence of factors 1 2 for most...

Page 40: ...roblems The installation Design Authority must ensure that the duct hazardous classified location and or hazardous area is in compliance with the ELDS unit s certification see section 9 for ELDS certification details In addition the duct environment shall not exceed the following Pressure 80kPa 0 8Bar to 110kPa 1 1Bar Temperature 55ºC to 60ºC Oxygen Content less than 21 v v 3 2 10Siting Multiple E...

Page 41: ...he reception of light from this non paired Tx This arrangement utilises both the horizontal and the vertical variation of unit mounting to achieve the maximum possible angular separation This alternating pattern can be repeated as many times as is necessary to cover the entire length of the border or fence line that is to be monitored The horizontal offset of Rx units achieved by this arrangement ...

Page 42: ...er in some applications multiple Cross Duct units are installed upon a common duct and in such cases measures to provide optical isolation need to be adopted Arrangement for 2 Cross Duct ELDS Systems In applications where two 2 Cross Duct ELDS systems are to be installed upon a duct Senscient recommends that the units are mounted with their beams running in opposite directions as illustrated below...

Page 43: ...of the other two units and they cannot interfere with it There is a possibility of interference between the two units that are mounted in the common direction however The angular separation between these two units top and bottom is approximately given by the following relation Π w d 180 θ where is the angle in degrees between the two transmitters pointing in the same direction and Pi is 3 142 Sens...

Page 44: ...t ensure that the maximum transient voltage between a unit s case and any field cable conductor is less than 1000V Voltages in excess of this may cause permanent damage to the unit c The entire length of the field cabling connected to each unit should be fully shielded screened This shield screen should be connected to a low noise clean earth ground preferably at a single point d The shields scree...

Page 45: ... use a single multicore cable for connecting a large number of field devices compromise screening and increase the potential for crosstalk Such arrangements should be avoided wherever possible n The 4 20mA outputs of gas detectors are typically updated no more than a few times a second whilst the electrical interference and noise introduced onto the cabling carrying a 4 20mA signal back to the con...

Page 46: ...ly immune to cable losses Where long cable runs are employed between the field device and the control room it is possible for current to leak away through the insulation reducing the current reaching the control room and therefore the apparent gas reading This can be misinterpreted as negative drift or warnings faults being signalled Current leakage is not usually a problem in high quality cables ...

Page 47: ...can then be gained by unscrewing the threaded rear cover A 12mm Allen key wrench supplied can be used to loosen the rear cover 3 3 3 Receiver Electrical Connections The terminal compartment of the Receiver of an ELDS 1000 2000 Series OPGD contains a 12 way terminal block by means of which most electrical connections to the unit can be made The terminal block is capable of accepting wires of up to ...

Page 48: ...f ELDS units are passive Correct operation of the 4 20mA output s in isolated mode requires a voltage source connected in series with the current loop ideally built into the control card 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE 4 20mA 1 V SCREEN SHIELD ...

Page 49: ... Sink 4 20 1 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE 4 20mA 1 SCREEN SHIELD LINK 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE V 4 20mA 1 4 20mA 1 0V LINK SCREEN SHIELD ...

Page 50: ...assive Correct operation of the 4 20mA output s in isolated mode requires a voltage source connected in series with the current loop ideally built into the control card 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V V RSENSE RSENSE V 4 20mA 2 4 20mA 1 4 20mA 2 4 20mA 1 SCREEN SHIELD ...

Page 51: ...for ELDS 2000 Receiver with Current Sources 4 20 1 4 20 2 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE RSENSE 4 20mA 2 4 20mA 1 4 20mA 2 4 20mA 1 LINK LINK 0V 0V SCREEN SHIELD ...

Page 52: ...or ELDS 2000 Receiver with Current Sinks 4 20 1 4 20 2 1 2 3 4 5 6 7 8 9 10 11 12 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V V RSENSE RSENSE V 4 20mA 2 4 20mA 1 4 20mA 2 4 20mA 1 0V 0V LINK LINK SCREEN SHIELD ...

Page 53: ...es The terminal numbers connection labels and proper functions of the connections available via the Transmitter terminal block are detailed in the tables below 8 Way Transmitter Terminal Block Terminal No Connection Label Function 1 24V Positive connection to system power supply 2 0V Negative or zero volt connection to system power supply 3 LOCAL 24V Local connection to 24V to configure 4 20 1 as ...

Page 54: ...iagram for ELDS 1000 2000 Series Transmitter 4 Way Block 1 2 3 4 5 6 7 8 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS TX TERMINAL COMPARTMENT 24V 0V 0V 24V SCREEN SHIELD 1 2 3 4 SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS TX TERMINAL COMPARTMENT 24V 0V 0V 24V SCREEN SHIELD ...

Page 55: ...ximum Cable Length m with 2 5mm 2 Conductors 7 6Ω km Receiver 10W 450 710 Transmitter 12W 375 590 Control room supply voltage assumed to be 24V Terminal sizes Transmitter 0 5mm 2 2 5mm 2 20AWG 14AWG Receiver 0 5mm 2 2 5mm 2 20AWG 14AWG In order to avoid power supply interruptions due to fuse ageing degradation it is advisable to use a fuse in the power feed to the ELDS units that is sufficiently d...

Page 56: ...OPGD system inspect the packaging for any external signs of damage Carefully unpack the equipment observing any instructions that may be printed on or contained within the packaging Check the contents for damage and against the packing note for deficiencies NB In the event of damage or loss in transit notify the carrier and Senscient or your local agent immediately NB Ensure that the installer end...

Page 57: ...nstallation Commissioning Senscient ELDS Rev 15 57 GB A complete shipment of an ELDS 1000 2000 Series OPGD system consists of the following items 1 x ELDS Transmitter Assembly 1 x ELDS Receiver Assembly ...

Page 58: ...Installation Commissioning 58 Senscient ELDS Rev 15 GB 2 x Mounting Brackets ...

Page 59: ...tion The mechanical installation procedure applies to both the Receiver and the Transmitter Check that the gas detector equipment supplied is compatible with the required application 1 i e correct gas and operating range for application Ensure that the Hazardous Area Certification of the equipment supplied is correct for the 2 Hazardous Areas Hazardous Classified Locations Hazardous Zones where th...

Page 60: ... as illustrated below The choice of fixing will depend on the nature of the surface and should take regard of the weight of the unit 13kg Pole Mounting Attach the mounting bracket to the pole using suitable fixings It is suggested that U bolts are used as illustrated below however other techniques may also be considered provided the unit is securely attached to the pole and is prevented from slipp...

Page 61: ...ct Transmitter or Receiver Attach the self adhesive mounting templates to the duct wall in the position identified for mounting of the Cross Duct ELDS system Using the templates drill and cut the necessary mounting holes in the opposite sides of the duct The most important requirement for successful installation of a Cross Duct ELDS system is that the optical centre lines as indicated by the cross...

Page 62: ...Installation Commissioning 62 Senscient ELDS Rev 15 GB Cross Duct ELDS Mounting Template 01 01 1089 D Bolt Mounting Plates on each side of the duct ...

Page 63: ...c bungs from the terminal compartment cable entry 2 Screwing a suitable explosion proof M25 cable gland or NPT conduit fitting into the terminal compartment entry and making this off 3 Feeding of field cabling or wires through the cable entry into the terminal compartment 4 Connecting the wires required for the field connections to the unit to the appropriate terminals of the terminal block See se...

Page 64: ... Initial Pointing The mounting bracket of ELDS OPGDs is designed to enable Transmitter and Receiver units to be initially pointed in the direction of their counterpart without use of the alignment telescope or the precision adjustment mechanisms Loosening the M12 nut and M6 locking screw on the adjustment block allows the unit hanging below to be quickly pointed in the direction of its counterpart...

Page 65: ...lignment Notes Ideally final alignment should be performed on a clear dry day Get familiar with the workings of the adjustable parts of the mounting bracket before proceeding with the alignment procedure See section 2 4 To ensure precise field alignment the alignment telescope makes use of the same mounting datum that was used when the unit was aligned in the factory The telescope incorporates eye...

Page 66: ...sitting correctly on the unit s alignment datum The alignment telescope s datum is the flat circular ring inside the three centration fingers on the bottom of the alignment telescope mounting mechanism The unit s alignment datum is the flat circular ring on the front of each unit s telescope mounting ring When the alignment telescope is correctly mounted its datum is sitting flat against the unit ...

Page 67: ...ntration fingers ready to locate on 1 the edge of the telescope mounting ring With the centration fingers touching the edge of the telescope mounting ring firmly push the 5 back surface of the gripping mechanism forwards towards the unit Push the back surface of the gripping mechanism forward until all three 3 gripping fingers 6 have clicked into the gripping recess on the telescope mounting ring ...

Page 68: ...lignment telescope allowing it to be pulled against the unit s mounting datum by the gripping mechanism Double check that the alignment telescope is correctly mounted by checking that all three 3 8 gripping fingers are clicked into the gripping recess and that the alignment telescope s mounting datum is in contact with the unit s alignment datum all the way around the mounting ring ...

Page 69: ...e is correctly mounted on the unit s alignment datum gently 9 rotate the telescope such that the eye piece is in a convenient position for viewing With the eye piece in a convenient position for viewing and the alignment datum s in contact 10 the alignment telescope is ready for use ...

Page 70: ...e of the lens window of the opposing unit as illustrated below Notes Unlike NDIR OPGDs Senscient ELDS 1000 2000 Series OPGDs are not critically sensitive to alignment A small improvement in alignment can be achieved by performing alignment adjustments whilst monitoring the received signal levels using SITE running on an industrial computer However for ELDS 1000 2000 Series OPGDs these small improv...

Page 71: ...axis of the alignment telescope When the eye is on axis the user will see a symmetrical circular image field See below To see the full field of view of the alignment telescope the user should position their eye approximately 3 inches away from the eye piece See below The alignment telescope features an eye relief adjustment which can be adjusted to make it easier for different individuals to focus...

Page 72: ...ser s eye is not on the axis of the alignment telescope an elliptical image field will be seen as below For correct use of the alignment telescope the user must keep their eye on axis which will result in them seeing a symmetrical circular image field Eye off axis ...

Page 73: ...ent adjustments in one axis to bring the cross hairs nearer to the centre of the lens window and then make some adjustments on the other axis Expect to go back and forth between the horizontal and vertical axes a few of times before achieving a good final alignment result Initially it is likely that the alignment will be quite a long way from ideal When it is necessary to make relatively large ali...

Page 74: ...e opposing unit through the alignment telescope If this is the case reduce the magnification of the alignment telescope using the magnification adjustment which will allow a larger field to be seen Once the opposing unit is more central the magnification can be increased again to enable the opposing unit to be seen more clearly ...

Page 75: ...correctly aligned Return an alignment telescope to Senscient if a problem with its alignment is suspected See section 4 3 2 When the aligner is getting close to achieving a good alignment they should screw in both pairs of adjustment screws such that the tips of these screws are in contact with their points of action Final precision alignment adjustments should be made against the resistance that ...

Page 76: ...d be locked off by simultaneously rotating the opposed pair of adjustment screws in the opposite direction against each other Performed correctly this locking off step should not affect the adjustment but should ensure that both adjustment screws are tight and that there is no play in the alignment of the unit Correct Final Alignment Locking Off ...

Page 77: ...gned CAUTION The alignment telescope is a precision optical alignment device Dropping or mishandling of the alignment telescope may result in the telescope becoming incorrectly aligned IF you DROP or DAMAGE an alignment telescope STOP using it and either CHECK that the alignment is still good using the process described below or RETURN it to Senscient for checking and re alignment Notes The proced...

Page 78: ...g that the telescope s alignment datum is still in perfect contact with the ELDS unit alignment datum With the telescope now in its second position check where the crosshairs of the alignment 5 telescope are pointing Provided that the crosshairs are within a 5cm radius of the centre of the lens window of the ELDS unit opposite the alignment of the telescope is good and the telescope can continue t...

Page 79: ...ss Duct Alignment Adjustment Bushings For installations on narrow ducts with rigid walls Cross Duct ELDS systems can be successfully installed and commissioned by taking advantage of the simplified no alignment required process that is made possible by the intentionally wide field of view of these systems However in some instances especially those involving retrofit of ELDS units on pre existing i...

Page 80: ...X units on their respective mounting plates 2 until the flanges on these units are in firm contact with the alignment adjustment bushings around the whole of their diameter NB The alignment adjustment bushings provide all of their alignment adjustment range by increasing the compression of the bushing Consequently the bolts should never be loosened or adjusted back from the point of firm contact M...

Page 81: ...target holder into the slot of the TX or RX unit opposite to which you 7 are about to align the XD unit Gradually tighten either one of the two M6 mounting adjustment bolts intended to provide 8 vertical alignment adjustments whilst observing the position of the red dot with respect to the fluorescent target Make vertical and horizontal adjustments until the red dot is in the centre of the circula...

Page 82: ... process the signal 10 reaching the Receiver should read somewhere between 2 and 60 depending upon duct width and the quality of alignment Cross Duct ELDS systems will perform fully in accordance with published specifications for signals between 2 and 60 Furthermore they will continue to perform correctly in the event that the signal is attenuated by up to 90 due to the operating conditions in on ...

Page 83: ...users will find that small changes in alignment will have no effect upon the signal levels or performance of ELDS VZ units Consequently there is no need for fine tuning of the alignment of ELDS VZ units a quick centering of the telescope cross hairs on each end of the system will always be sufficient Consequently there is no need for fine tuning of the alignment of ELDS VZ units a quick centering ...

Page 84: ...Installation Commissioning 84 Senscient ELDS Rev 15 GB 2 Select Communications Link to be used by clicking either Wireless RF Bluetooth or RS485 ...

Page 85: ... RS485 B Black wires connected to the correct terminals A and B The RS485 communications link does not work if you connect these wires the wrong way around If the Power On Unit screen below is presented no RS485 communications were possible with the ELDS unit The most likely explanations for no RS485 communications are no power reaching the ELDS unit or incorrect connection of the RS485 leads Chec...

Page 86: ...hat below will be presented The status of RS485 communications is shown by the colour of the square RX and TX boxes with Green indicating live RS485 communications and Red indicating no RS485 communications When the necessary RS485 communications have been established click OK This will return you to the Main SITE screen ready to select Installation ...

Page 87: ... simultaneously If the desired ELDS unit does not appear in the drop down click to refresh the list of units available If the ELDS unit wanted still does not appear check that power has been applied to the unit and refer to section 4 6 2 Bluetooth Communications Notes and Guidance CAUTION The convenience and range of Bluetooth makes it possible to make connections to units other than those intende...

Page 88: ...his process has been completed the square boxes corresponding to these connected devices will turn Green With the required Bluetooth connections made click OK to return to the Main SITE screen 3 Commence TX Installation Select the TX by clicking the TX button which will turn the button Green Begin the installation and commissioning process by clicking Installation ...

Page 89: ...ss the screen below will be displayed asking you to confirm that the TX and RX units are correctly aligned before continuing Confirm this and click Continue 4 Changing Setting Unit Tag You now have the opportunity set change the Tag that will be reported by the unit during operational service ...

Page 90: ...dated accordingly The Tag and Bluetooth friendly name are intentionally set the same If the Tag is changed when connected via Bluetooth there will be a slight delay whilst the Tag is updated and the Bluetooth connection is re established with the new Tag Bluetooth friendly name When SITE has completed commissioning the Transmitter acknowledge this by clicking OK With commissioning of the Transmitt...

Page 91: ...nection to an ELDS unit is the same for both Transmitter and Receiver units Following the process described for choosing and setting up a connection in section 4 5 1 set up a connection to the Receiver that is to be installed and commissioned 2 Commence Receiver Installation To begin the Receiver installation and commissioning process select the Receiver by clicking on the RX button turning it Gre...

Page 92: ... the first possibility in the selection box If this is not the correct Transmitter unit use the drop down menu to select a different Transmitter NB Check the Transmitter information carefully to confirm that you are pairing the correct type of Transmitter with the Receiver and that this is the correct type of ELDS unit to be installed at this particular tag location Having selected the correct TX ...

Page 93: ...yed might look similar to that below with an Amber Signal Low message box The most likely explanations for a screen similar to the above being displayed are The alignment of either the TX or the RX unit to its counterpart opposite is poor Use an alignment telescope and the ELDS alignment procedure to check and improve the alignment to achieve the expected signal The lens windows of either the TX o...

Page 94: ...rect alignment that very little or no signal is reaching the Receiver Use the alignment telescope and the procedure described in section 4 3 to correctly align the Transmitter and Receiver units with respect to each other No TX Power The Transmitter is not receiving the 24V nominal power supply voltage that it requires to operate Use a multimeter to check that the 24V supply is reaching the TX uni...

Page 95: ...ble differences but occasionally where a transmitter is near the limit of imbalance it may be that this message will occur Given that re aligning the transmitter or receiver is unlikely to correct this problem when it is caused by a marginal transmitter SITE will allow the installation to proceed even though the laser powers are badly matched The system will function normally despite this imbalanc...

Page 96: ...econds and 2 minutes to complete Once this zeroing process has been completed SITE will proceed to the Change Tag screen For ELDS detectors where zeroing is advisory but optional the screen below will be displayed Where and when the user is confident that there is no gas in the beam path the zeroing process should be initiated by clicking Zero If the user cannot be sure that there is no gas in the...

Page 97: ... Only zero a system when you are confident that there is either zero target gas or a negligibly small quantity of target gas in the beam path CAUTION If any of the following occur during the zeroing process the zero might not be correct A release of target gas took place in or near the system An object or person moved into or through the beam path A gassing cell was mistakenly inserted or left in ...

Page 98: ...tting Changing Tag You now have the opportunity set change the Tag that will be reported by the unit during operational service If you want to set change the Tag left click on the Tag being displayed and use the keyboard to make the required changes to the Tag ...

Page 99: ... the current measured and displayed by the control system or the Loop1 Actual current loop read back Mod State 2 and higher NB When using the Loop1 Actual current loop read back feature a 0 5mA allowance needs to be made for the cumulative tolerances that affect the Loop1 Actual reading In the above illustration a Forced Value of 4mA is reading back as 3 7mA which is within the expected range Havi...

Page 100: ...Custom Configuration button entering the filename of the required custom configuration and clicking Continue Users wishing to configure these items individually can do so by clicking the Configure Individually button launching the individual configuration process The properties that can be configured individually are as follows Inhibit current Fault current Beam Block current Time between detectin...

Page 101: ...485 Disconnect the RS485 A and B leads from the Transmitter s terminal block Carefully replace the terminal compartment lid and screw it down firmly Once the terminal compartment lid is properly screwed down attach and lock off the anti tamper fixture CAUTION Both the explosion proof protection and the ingress protection of the ELDS OPGD system rely upon the terminal compartment lid being screwed ...

Page 102: ...from responding to any commands or requests received via Bluetooth Henceforth the unit will only respond to commands or requests received via RS485 In order to disable Bluetooth wireless operation from the SITE main screen click Config and when the Info screen appears uncheck the Bluetooth Interface checkbox This checkbox is not normally enabled for change to allow it to be altered it is necessary...

Page 103: ... still need to make use of the hard wired RS485 connection Mod state 1 onwards Cross Duct ELDS systems are installed on ducts with their Bluetooth antennae predominantly radiating into the duct This configuration significantly reduces the amount of wireless signal outside the duct available for establishing a Bluetooth connection and may even prevent the successful use of Bluetooth In such circums...

Page 104: ...TE functions requiring simultaneous connections to both ends of an ELDS system Every SITE function can either be performed from just one end of an ELDS system or at one end followed by the other Since in the majority of field installations it will not be possible to make reliable simultaneous Bluetooth connections to both the RX and TX of an ELDS system avoid problems by only using Bluetooth to co...

Page 105: ...ormation concerning installation alignment and commissioning is provided in this Technical Manual Senscient ELDS is explosion protected by a certified explosion proof enclosure Carefully read the safety warnings cautions and certification details in this manual Ensure that they have been complied with before and during the installation The following is a check list with notes to assist the install...

Page 106: ...m vents If there is the possibility that such heat sources are causing unacceptable temperatures to be reached investigate how the effects of these sources can be reduced Supply Voltage Check that the supply voltage applied to the unit is within the specified 18V to 32V range and is stable Earthing Inspect the earth ground connections to the units RFI EMC Assess the installation cabling and its cl...

Page 107: ...er completing the installation procedure perform a functional test upon the unit using SimuGas 4 20mA Loop Integrity Test the 4 20mA loop integrity by forcing the unit to output a known current and monitoring this at the control room or with a multimeter inserted into the loop ...

Page 108: ... make them identical to the Harmonic Fingerprints produced by the presence of real target gases in the beam path Senscient recommends that SimuGas tests are all that are needed to verify the correct functionality of ELDS OPGDs in field service conditions The flexibility afforded by SimuGas technology makes it possible to perform functional testing of ELDS OPGDs in two different ways SimuGas Auto a...

Page 109: ...e Channel Using the signal reaching the reference detector through the retained gas sample the Transmitter s microcontroller is capable of determining the precise bias and wavelength modulation components that need to be applied to the laser diode s in order to ensure that absorption of the laser diode s optical radiation by target gas always produces a Harmonic Fingerprint A Harmonic Fingerprint ...

Page 110: ...s electronically synthesising the drive waveforms that are applied to its laser diode s and knows the sizes of the Harmonic Fingerprint components produced by target gas it is possible for a Transmitter to electronically synthesise laser diode drive waveforms which include Harmonic Fingerprint components corresponding to a quantity of target gas When the laser diodes in an ELDS Transmitter are dri...

Page 111: ... technology it is possible to perform functional testing of ELDS OPGDs in a number of different ways which are described in the following sections 5 2 SimuGas Auto The simplest way for users to realise the considerable safety integrity benefits provided by SimuGas technology is to make use of SimuGas Auto automated ELDS gas detector functionality testing that is a standard feature of ELDS systems ...

Page 112: ...ts the configured Fault signal on its 4 20mA output s Extraction of the results of SimuGas Auto testing that are contained in the Event Log of an ELDS Receiver provides clear documentable evidence of the correct operation of an ELDS OPGD over the entire period covered by the Event Log 5 2 1 Operator Initiated SimuGas Auto Test In addition to the automatically initiated SimuGas Auto tests which are...

Page 113: ...e SimuGas Live test the Receiver will calculate the gas level s present in the monitored beam path as normal and signal these readings over its 4 20mA output s The results of a SimuGas Live test may be determined by comparison of the gas reading s signalled by the Receiver during the test with the gas level s that the Transmitter was simulating 1 See section 5 4 SimuGas Levels for details of the l...

Page 114: ... current signalled on the Receiver s 4 20mA output s during this test whilst the SimuGas Auto levels will provide a robust reliable confirmation of ELDS OPGD gas detection functionality This ensures that the principle benefits of SimuGas technology are delivered on all ELDS product variants The levels of SimuGas Live and SimuGas Auto tests and typical test tolerances are presented in the table bel...

Page 115: ...jority of applications Senscient would recommend that a scheduled maintenance and testing visit be made to ELDS OPGDs annually Where experience of the operational conditions at a particular facility indicate that more regular maintenance visits would be beneficial users should schedule visits at the frequency required to maintain gas detection system availability at the level appropriate to the ap...

Page 116: ...mitter In the event of the build up of extremely heavy contamination this could result in an ELDS OPGD signalling either a Low Signal or a Beam Block condition suggesting that the system be visited and its optics cleaned if necessary Cleaning of the lens windows of the TX or RX of an ELDS OPGD requires the following A reasonable quantity of a pure clear solvent such as tap water or IPA preferably ...

Page 117: ...olved by step 2 Repeat steps 2 and 3 until any and all contaminants originally on the lens window have been 4 washed or rubbed away Do not re use dirty portions of cleaning cloth this will leave a smear prone film When any and all contaminants have been washed or rubbed away dry the lens window with 5 a clean portion of cleaning cloth Polish the dry lens window with a dry clean portion of cleaning...

Page 118: ...Series OPGDs require a stable sufficient and reliable supply of 24V power in order to operate reliably Correctly engineered PSU and cabling arrangements will contribute greatly to the reliability and availability of an ELDS OPGD based gas detection system Carefully review the power supply and cabling arrangements to be used to power ELDS units before the cables or power supplies are specified purc...

Page 119: ...ndingly low alarm threshold can be that small non hazardous background levels of toxic gases or fugitive emissions can result in alarm signals being raised and operators becoming concerned When this happens users and operators eventually establish that these alarms are a nuisance and that the measurement range that they have specified and the alarm thresholds that they have set are too low for the...

Page 120: ...nd that attempt to handle such problems However in instances where a lasting breakdown of HART or Modbus communications develops the simplest way of resolving this problem may be cycling the power to the system or to the ELDS unit with which communications have broken down 7 2 SITE Diagnostics Screen In many instances the quickest and simplest way of identifying and diagnosing a problem with an EL...

Page 121: ...r normal circumstances the Signal Level box displays the signal level s being received from each laser of the ELDS Transmitter opposite Depending upon the path length alignment and prevailing visibility the signal level s should be somewhere in the range 0 05 to 2 000 NB When SITE is used to install and commission an ELDS system it will perform a check that the signal levels being received are rea...

Page 122: ...and a diagnosis of Beam Block is pending Beamblock The Receiver has not been receiving any valid signal s from the ELDS Transmitter opposite and a Beam Block has been diagnosed and declared Rapid Signal Loss The signal reaching the Receiver was lost or reduced very rapidly leading to the diagnosis and declaration of a rapid signal loss Beam Block Not Installed The system has not been successfully ...

Page 123: ...ng box for approximately 10 seconds This requires a live connection between SITE and the Receiver at the time of performing the SimuGas Auto test After the SimuGas Auto test has been completed connect to the Receiver and inspect the Event Log The last SimuGas Auto entries in the Event Log will correspond to the most recently performed SimuGas Auto test Start SimuGas Live By choosing to Start SimuG...

Page 124: ...ATUS DESCRIPTION System Running The transmitter is up and running correctly with its laser s locked onto target gas Hunting For Gas The transmitter is performing the gas lock hunting procedure Gas Hunt Complete The transmitter has successfully completed the gas lock hunting procedure Full Gas Search The transmitter is executing a full gas search in order to lock its laser s on target gas es Failed...

Page 125: ...it returns to normal status 4mA Output is 2 5mA BEAM BLOCK Beam path is blocked Check that the beam path is clear from the TX to RX Remove any obstruction if present TX or RX misaligned 1 Use the alignment telescope to check the alignment of both the TX and the RX with respect to each other 2 Make and lock off any alignment adjustments required 3 Connect to the Receiver using SITE and check the si...

Page 126: ...s have failed Check TX unit is running with SITE Request Manual SimuGas Auto SITE No SimuGas event in last 7 days Check TX unit is running with SITE and that RX has a valid signal beampath not blocked alignments correct Request Manual SimuGas Auto SITE Output is 0 0mA Hard FAULT No power 24V at RX Check that the 24V supply is reaching the RX unit Voltage at the unit should be between 18V and 32V I...

Page 127: ...ere at facilities handling or processing large quantities of volatile liquids or gases This background gas will add to the total quantity of gas measured when a Gassing Cell is placed in the beam path Make allowance for errors that may be introduced by a target gas background at the facility Pressurisation of the Gassing Cell If the contents of the Gassing Cell has become pressurised this will inc...

Page 128: ...et and present currents below 4mA correctly or Familiarise operators with the interpretation of sub 4mA currents from ELDS OPGDs as follows FAULT 0 5mA INHIBIT 2mA BEAM BLOCK 2 5mA LOW SIGNAL 3mA or Reconfigure the INHIBIT BEAM BLOCK and LOW SIGNAL currents output by the ELDS unit Event Log Dates and Times wrong The time and date record being stored by the Real Time Clock RTC has been lost 1 Re en...

Page 129: ...eans of obtaining reliable analysis and diagnosis of any problem affecting an ELDS system is to download snapshots from the Transmitter and Receiver unit in the sna format and to send them to Senscient or their local representative These snapshots will contain all of the recent entries into the unit s Event Logs as well as other useful information The table below provides information about all of ...

Page 130: ...o Beam Block Consequently a Beam Block condition has been diagnosed and declared at this time Check for obstruction of beam path dirty optics mis alignment and 24V power at Transmitter Low Light The ELDS signal reaching this Receiver has been below the Low Light threshold for long enough to require the recording of a Low Light event log entry at this time Check for obstruction of beam path dirty o...

Page 131: ...e user has updated the configuration settings of the system at this time System Installed The ELDS system was successfully installed and commissioned at this time Watchdog Restart A watchdog restart was executed at this time Settings Initialised The settings of this ELDS unit were initialised at this time SimuGas Manual Start The Transmitter was commanded to execute a SimuGas Live test which start...

Page 132: ...owing table A full specification of the different ranges for each output is provided for each ELDS part number in Appendix H Gas Open Path Ranges Available Path Lengths Methane CH4 0 1 0 1 LFL m 0 5 0 1 LFL m 0 1 000ppm m 0 1 LFL m 5 40m 40 120m 120 200m Methane CH4 Hydrogen Sulphide H2S 0 1 LFL m CH4 0 250 ppm m H2S 0 500 ppm m H2S 0 1 000 ppm m H2S 0 15 000 ppm m H2S 5 60m Hydrogen Sulphide H2S ...

Page 133: ...FSD Typical Performance Cross Duct XD Units Ventilation Zone VZ Units Parameter Value Response Time T90 1 second Repeatability 5 FSD Linearity 5 FSD Parameter Value Typical Performance Cross Duct XC Units Parameter Value Response Time T90 0 25 seconds Repeatability 5 FSD Linearity 5 FSD Service Availability The percentage of time that a unit will be available and operating ignoring forced interrup...

Page 134: ...Systems per IEC 61508 Electrical Operating Voltage Tx Rx 24V DC 18 to 32V DC Power Consumption Tx 12 W max Rx 10 W max Outputs Analog x 2 4 20 mA Configurable for 2 wire isolated or single wire sink or source Primary range on 4 20mA 1 Secondary range on 4 20mA 2 Low Signal 3 mA configurable 1 to 4 mA Beam Block 2 5 mA configurable 0 to 3 5 mA Inhibit 2 mA configurable 1 to 3 5 mA Fault 0 5 mA conf...

Page 135: ...0 mm sq 5 5 kg each Mounting Both Tx Rx units require a mounting plate ordered separately for flat duct wall fixing Fixing bolts are not supplied Optical Uses HARMONIC FINGERPRINT to ensure no false alarms during adverse environmental conditions misalignment or partial obscuration Alignment 0 5 Obscuration operates up to 95 Heated Optics Tx Rx lenses are continuously heated Laser Beam Class 1 Eye ...

Page 136: ...IB H2 T5 Class I Zone 1 AEx d IIB H2 T5 Tamb 40 C to 60 C Entry NPT ATEX IECEx Exd IIB H2 T5 Gb Ex tb IIIC T100oC IP66 67 Tamb 40oC to 60oC Entry M25 GOST K EAC TR CU CofC 1EXDIIBT5 H2X Tamb 40oC to 60oC Entry M25 GOST R EAC TR CU Cof C 1EXD IIBT5 H2X Tamb 40oC to 60oC Entry M25 InMetro Ex d IIB H2 T5 Gb ou Extb IIIC T100OC Db IP66 67 Tamb 40oC a 60oC Entry M25 ...

Page 137: ...Lengths S Short Range 5m 40m 5m 60m dependent on the gas M Medium Range 40m 120m L Long Range 120m 200m VZ Ventilation Zone Configuration 0 5m 5m XD Cross Duct HVAC Configuration 0 5m 5m XC Cross Duct Coal Bed Combustion Configuration 0 5m 5m Open Path Devices GGGG Gas Range 1012 0 1LFL m CH4 1080 0 1 000 ppm m NH3 2013 0 1LFL m CH4 0 250ppm m H2S C Certification 1 FM 2 FM ATEX 3 ATEX IECEx 4 CSA ...

Page 138: ...0079 31 EN60529 EN50270 CSA Certified for US and Canada Class I Div1 Groups B C D Class II III Div1 Groups E F G Exd IIB H2 T5 Class I Zone 1 AExd IIB H2 T5 Tamb 40ºC to 60 ºC CSA Master Contract MC 248589 Ingress Protected IP66 67 Type 4X 6 Stainless IP66 67 Type 4 6 Aluminium Standards CSA C22 2 No 0 M91 CSA C22 2 No 25 1966 CSA C22 2 No 30 1986 CSA C22 2 No 94 1991 CSA C22 2 No 142 1987 CAN CSA...

Page 139: ...r is Similar Unique serial No Manufacturers trademark address CE mark Notified Body for ATEX ATEX IECEx Certificate No Installation Requirements Unique Part number Product description Warning Instructions Hot surface symbol warning Hazardous area markings gases Hazardous area markings dusts Op Temp range Electrical ingress protection ratings ...

Page 140: ...Certification 140 Senscient ELDS Rev 15 GB 9 1 2 Control Drawing CENELEC ATEX ...

Page 141: ...iver is Similar Note Unique serial No Manufacturers trademark address Agency Approval CSA for US Canada CSA master contract No Installation Requirements Unique Part number Product description Warning Instructions Hot surface symbol warning Hazardous classified gases Hazardous classified dusts Op Temp range Electrical ingress protection ratings Zones marking ...

Page 142: ...Certification 142 Senscient ELDS Rev 15 GB 9 1 4 Control Drawing CSA US Canada ...

Page 143: ... of the analog signal on a 4 20mA loop 10 2 Measurement Units LFL m Lower Flammable Limit metres LFL m Open path detectors measure the total amount of gas present in the beam path LFL m readings are calculated by multiplying the flammability LFL of the gas in a gas cloud by the cloud s size m LFL m monitoring can be particularly beneficial when ELDS gas detectors are protecting the perimeter of a ...

Page 144: ...ble Limit LR Long Range MR Medium Range NPT National Pipe Thread RFI Radio Frequency Interference SR Short Standard Range SIL Safety Integrity Level OPGD Open Path Gas Detector NDIR Non Dispersive Infrared ELDS Enhanced Laser Diode Spectroscopy CSA Canadian Standards Authority UL Underwriters Laboratory FM Factory Mutual ppm Parts per million v v Percentage by volume ...

Page 145: ...nd Interface Cable A 5060 2 Industrial Computer ATEX Approved with SITE Software and Interface Cable Alignment Scope and Carry Case A 5070 2 Industrial Computer UL Approved with SITE Software and Interface Cable A 5060 1 Industrial Computer UL Approved with SITE Software and Interface Cable Alignment Scope and Carry Case A 5070 1 Cross Duct Alignment Site and Target A 5090 1 Cross Duct Gassing Cel...

Page 146: ...B The following two diagrams identify the correct component assembly locations for fitting the rear compartment lid anti tamper bar as well as the internal and external earths see below Ensure that these components are assembled and fitted in the correct positions ...

Page 147: ...and prone to the significant sources of error that are associated with uncontrolled outdoor environments Consequently Senscient does not recommend testing ELDS OPGDs with target gas es in field service conditions and recommends the use of SimuGas wherever possible In circumstances where operators are mandated to perform testing of gas detectors using a sample of gas Senscient can supply a Gassing ...

Page 148: ... certainly produce low readings The Gassing Cell is designed to be filled and shut off sealed so that it can subsequently be 3 used for testing over approximately an 8hour period Before connecting the gas cylinder to the Gassing Cell open both of the Gassing Cell s 4 valves Always use a flow regulator on the gas cylinder to protect the Gassing Cell from exposure to 5 excessive pressure and or flow...

Page 149: ...ll cannot be used to evaluate the response time of an ELDS OPGD the Gassing Cell is ONLY suitable for verifying the steady state response to target gas es The reason for this is that when a Gassing Cell is introduced into the beam path of an ELDS OPGD system the windows window guards and walls of the Gassing Cell significantly reduce the signal reaching the ELDS Receiver unit In order to make meas...

Page 150: ... will be affected by atmospheric pressure and ambient temperature Suitable allowance for these factors must be made when assessing the gas response of the detector Errors of the order of 15 of reading should be expected whilst errors as large as 30 of reading may occur at times When testing the gas response of an OPGD the very best results will be obtained when the unit s windows are clean the ali...

Page 151: ...o p 1 000ppm CH4 0 1 000ppm m 236 ppm m 200 275 ppm m 7 9 mA 20 V V CH4 0 1LFL m 0 94 LFL m 0 8 1 1 LFL m 16 5 21 5mA O R 20 V V CH4 0 5LFL m 0 94 LFL m 0 8 1 1 LFL m 6 5 8mA 60 V V CH4 0 5LFL m 2 83 LFL m 2 4 3 3 LFL m 11 5 15mA 65 V V CH4 0 5LFL m 3 07 LFL m 2 5 3 5 LFL m 11 5 15 5mA Table values reflect typical errors of 15 of reading Larger test errors are possible ...

Page 152: ...ect typical errors of 15 of reading Larger test errors are possible Recommended Test Gas Typical Gassing Cell Responses for Toxic Gases Gas Measurement Range Test Gas Cell Burden Response Range 4 20mA O P 0 250ppm m H2S 500ppm 118ppm m 83 153 ppm m 9 3 13 8mA 0 500ppm m H2S 1 000ppm 236ppm m 177 295 ppm m 9 7 13 4mA 0 1 000ppm m H2S 2 000ppm 472ppm m 378 566 ppm m 10 0 13 1mA 0 1 500ppm m H2S 2 00...

Page 153: ...t gas the total burden of gas introduced by this cell can vary significantly Consequently the Cross Duct Refillable Gas Test Cell is only suitable for performing a gas detection functionality check a bump test and cannot be used to quantify gas response or verify calibration ELDS systems are factory calibrated for life and do not require calibration checks to be performed The Cross Duct Refillable...

Page 154: ...ave built inside the Gas Test Cell to 5 be relieved through the open filling valve Close the cell filling valve by carefully rotating the brown valve seal control clockwise until 6 valve is finger tight NB The cell filling valve is shut when the valve seal control is finger tight and should not be further tightened using hand tools CAUTION In order to achieve best results and avoid the risk of bur...

Page 155: ...rs in field service conditions any unexpected results are far more likely to be due to test errors rather than a problem with an ELDS unit s calibration This is why most OPGD manufacturers including Senscient do not allow in field gas calibration of this type of gas detector and recommend that gas response checks only be treated as bump tests not calibration verification checks Cross Duct ELDS sys...

Page 156: ...ing Gas 156 Senscient ELDS Rev 15 GB Once the Cell Aperture is uncovered the Cross Duct Gas Challenge Cell can be inserted into the measurement path of the Cross Duct ELDS system that is being tested as illustrated below GAS TEST CELL ...

Page 157: ...l as illustrated below Verify the response of the Cross Duct ELDS system being tested by monitoring the system s 4 20mA output or the gas reading using SITE After completing the test remove the Gas Challenge Cell and replace the Challenge Cell Aperture Cover GAS TEST CELL CORRECTLY LOCATED ...

Page 158: ...Appendix D Manufacturer s EC Declarations 158 Senscient ELDS Rev 15 GB 13 Appendix D Manufacturer s EC Declarations ...

Page 159: ...Appendix D Manufacturer s EC Declarations Senscient ELDS Rev 15 159 GB ...

Page 160: ...Appendix D Manufacturer s EC Declarations 160 Senscient ELDS Rev 15 GB ...

Page 161: ...ing HART communication system The ELDS HART DD is not currently included in the DD library distributed by the HART Foundation 14 2 Electrical Connections Configuration Since the HART communications modem in the 4 20mA 1 output of ELDS Receivers is configured to be a Slave device working in a conventional HART Master Slave loop the electrical connections configuration for such an installation shoul...

Page 162: ...ARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE HART MASTER CURRENT INPUT 4 20mA 1 V SCREEN SHIELD 1 2 3 4 5 6 7 8 9 10 11 12 RX WIRING DIAGRAM HART 4 20 1 SOURCE SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE HART MASTER INPUT 4 20mA 1 SCREEN SHIELD LINK ...

Page 163: ...e as below Parameter Value Minimum Rtt 100kΩ Maximum Ctt 5nF Minimum Operating Current 1mA Maximum Operating Current 22mA Minimum Operating Voltage 5V Maximum Operating Voltage 32V 1 2 3 4 5 6 7 8 9 10 11 12 RX WIRING DIAGRAM HART 4 20 1 SINK SAFETY PROTECTIVE EARTH INSTRUMENT EARTH CLEAN CONTROL CABINET CONNECTIONS RX TERMINAL COMPARTMENT 24V 0V 0V 24V RSENSE HART MASTER INPUT 4 20mA 1 SCREEN SHI...

Page 164: ... output range is inherently limited by the maximum current that can be output typically 21 5mA the values passed to the HART primary and secondary variables are not restricted allowing the user to monitor gas levels that are beyond the 4 20mA output measurement range of the instrument Analogue 4 20mA 1 Level The analogue current that is to be output by 4 20mA 1 output of an ELDS Receiver can be ob...

Page 165: ...DS full scale which is normally imposed by the limited range of the 4 20mA output 3 Read Dynamic Variables and Loop Current 1 st Loop Current gas values and last SimuGas values The loop current in mA is explicitly coded in this HART command the 4 dynamic variables contain the following data PV gas reading for 1 st laser SV gas reading for 2 nd laser TV SimuGas response 1 st laser QV SimuGas respon...

Page 166: ...nd are detailed below in section 14 3 2 14 3 2SimuGas Information over HART In order to enable the results of the last SimuGas test performed by an ELDS system to be made available using Universal HART commands the response to HART command 13 Read Tag Descriptor Date will contain the following information Message Description NO SG EVENT There has been no SimuGas event since the Rx was last powered...

Page 167: ...Signal Loss Suppression for Laser 0 1 st laser 2 Rapid Signal Loss Suppression for Laser 1 2 nd laser 1 Finger print failure for Laser 0 primary harmonics 0 Finger print failure for Laser 1 primary harmonics 2 7 Laser 0 primary harmonics locked 6 Laser 1 primary harmonics locked 5 Laser 0 primary harmonics lock failure 4 Laser 1 primary harmonics lock failure 3 Laser 0 negative gas fault 2 Laser 1...

Page 168: ... 9600 Parity None Odd Even Mark or Space Default None Stop Bits 1 Unit Address Range 1 to 255 Default Rx 1 Tx 2 Time to start response to request Typically 0 1mS Supported Modbus Commands NOTE Modbus Broadcast commands are not supported 0x01 Read Coils 0x02 Read Discrete Inputs 0x03 Read Holding Registers 0x04 Read Input Registers 0x05 Write Single Coil 0x06 Write Single Holding Register 0x0F Writ...

Page 169: ... if valid 10 Laser 0 Span 0 if invalid 1 if valid 11 Laser 1 Span 0 if invalid 1 if valid 12 L0 Rapid Signal Loss 1 if asserted 13 L1 Rapid Signal Loss 1 if asserted 14 L0 Fingerprint Failed 1 if asserted 15 L1 Fingerprint Failed 1 if asserted 16 L0 Locked 17 L1 Locked 18 L0 Lock Failed 19 L1 Lock Failed 20 L0 Fault 21 L1 Fault 22 L0 Inhibit 23 L1 Inhibit 24 L0 Over Range 25 L1 Over Range 26 L0 Ne...

Page 170: ...ted 5 Rx L1 Zero Calibration value will be reset to 0 once zero completed These are read write bit data and can be read using the Modbus command 0x01 Read Coils and can be written using commands 0x05 Write Single Coil or 0x0F Write Multiple Coils Each of these registers are available on both ELDS Transmitter and Receiver units however 1 and 2 only apply to Transmitter units whilst 3 4 and 5 only a...

Page 171: ...o 59 41 Rx L1 Last Gas Second 0 to 59 These are read only and can be read using the Modbus command 0x04 Read Input Registers There are two separate outputs of the measured gas values for the Receiver units The simple form Inputs 1 and 2 contain the gas value in ppm m units These outputs are restricted to the range 0 to 65535 ppm m which is sufficient to cover the normal full scale range of most EL...

Page 172: ...ternational health safety legislation and any relevant policies procedures or working practices of the companies that will be involved in the deployment operation or maintenance of the safety system Gas detectors can only ever form part of a safety system and it is the responsibility of the Design Authority to ensure that the entirety of any safety system provides the required level of safety prot...

Page 173: ...1 250ppm m A2 500ppm m R 0 1LFL m A1 0 2LFL m A2 0 4LFL m Path Length 30 60 m R 0 1 000ppm m A1 400ppm m A2 600ppm m R 0 1LFL m A1 0 2LFL m A2 0 4LFL m Path Length 60 90 m R 0 1 000ppm m A1 500ppm m A2 750ppm m R 0 1LFL m A1 0 3LFL m A2 0 5LFL m Path Length 90 120 m R 0 5 000ppm m A1 1 000ppm m A2 1 500ppm m R 0 1LFL m A1 0 4LFL m A2 0 6LFL m Key R Guideline measurement range A1 Guideline first al...

Page 174: ...m m A2 4 000ppm m R 0 1LFL m A1 0 3LFL m A2 0 5LFL m Path Length 90 120 m R 0 10 000ppm m A1 2 500ppm m A2 5 000ppm m R 0 1LFL m A1 0 4LFL m A2 0 6LFL m Key R Guideline measurement range A1 Guideline first alarm threshold A2 Guideline second high alarm threshold Guideline Measurement Ranges and Alarm Thresholds for ELDS XD VZ and High Temp XD Methane CH4 Detectors Application Flammable Hazard Dete...

Page 175: ... about a flammable gas release a warning that might allow remedial action to be taken to prevent a much larger and more dangerous leak from occurring In order to provide early warnings about developing flammable gas leaks lower measurement ranges need to be employed ELDS units are available with 0 1LFL m 0 10 000ppm m and 0 1 000ppm m measurement ranges These guidelines recommend the use of a 0 1L...

Page 176: ...th 15 30m R 0 250 ppm m A1 150ppm m A2 225ppm m R 0 500 ppm m A1 200ppm m A2 300ppm m R 0 500 ppm m A1 300ppm m A2 450ppm m R 0 500 ppm m A1 200ppm m A2 300ppm m R 0 1 000 ppm m A1 300ppm m A2 450ppm m R 0 1 000 ppm m A1 450ppm m A2 675ppm m R 0 1 000 ppm m A1 300ppm m A2 450ppm m R 0 1 000 ppm m A1 400ppm m A2 600ppm m R 0 1 000 ppm m A1 500ppm m A2 750ppm m Path Length 30 60 m R 0 500 ppm m A1 3...

Page 177: ...0ppm m A2 300ppm m Path Length 90 120 m R 0 200ppm m A1 50ppm m A2 100ppm m R 0 1 000ppm m A1 250ppm m A2 500ppm m Guideline Measurement Ranges and Alarm Thresholds for ELDS Open Path Ammonia NH3 Detectors Application Health Environmental Leak Hazard Detection Path Length 5 30 m R 0 1 000ppm m A1 150ppm m A2 250ppm m R 0 1 000ppm m A1 300ppm m A2 500ppm m Path Length 30 60 m R 0 1 000ppm m A1 250p...

Page 178: ...h 60 90 m R 0 50ppm m A1 30ppm m A2 40ppm m Path Length 90 120 m R 0 50ppm m A1 30ppm m A2 40ppm m Guideline Measurement Ranges and Alarm Thresholds for ELDS Open Path Carbon Dioxide CO2 Detectors Application Leak Hazard Detection Path Length 5 30 m R 0 300 000ppm m A1 60 000ppm m A2 120 000ppm m Path Length 30 60 m R 0 300 000ppm m A1 60 000ppm m A2 120 000ppm m Path Length 60 90 m R 0 300 000ppm...

Page 179: ... LEL m 1000 ppm m ATEX BASEEFA M 1009 4 1LFL m 1000ppm m CH4 CSA Medium Range 1 LEL m 1000 ppm m CSA UL M 1009 5 1LFL m 1000ppm m CH4 GOST R Medium Range 1 LEL m 1000 ppm m GOST R M 1009 6 1LFL m 1000ppm m CH4 GOST K Medium Range 1 LEL m 1000 ppm m GOST K M 1009 7 1LEL m 1000ppm m CH4 InMetro Medium Range 1 LEL m 1000 ppm m InMetro M 1010 3 1000ppm m CH4 ATEX Medium Range 1000 ppm m 1 LEL m ATEX B...

Page 180: ...FL m 1000ppm m CH4 CSA Short Range 1 LEL m 1000 ppm m CSA UL S 1009 5 1LFL m 1000ppm m CH4 GOST R Short Range 1 LEL m 1000 ppm m GOST R S 1009 6 1LFL m 1000ppm m CH4 GOST K Short Range 1 LEL m 1000 ppm m GOST K S 1009 7 1LEL m 1000ppm m CH4 InMetro Short Range 1 LEL m 1000 ppm m InMetro S 1010 3 1000ppm m CH4 ATEX Short Range 1000 ppm m 1 LEL m ATEX BASEEFA S 1010 4 1000ppm m CH4 CSA Short Range 1...

Page 181: ...CO2 InMetro Short Range 300000 ppm m 100000 ppm m InMetro S 1080 3 1000ppm m 500ppm m NH3 ATEX Short Range 1000 ppm m 500 ppm m ATEX BASEEFA S 1080 4 1000ppm m 500ppm m NH3 CSA Short Range 1000 ppm m 500 ppm m CSA UL S 1080 5 1000ppm m 500ppm m NH3 GOST R Short Range 1000 ppm m 500 ppm m GOST R S 1080 7 1000ppm m 500ppm m NH3 InMetro Short Range 1000 ppm m 500 ppm m InMetro S 1081 3 1000ppm m 5000...

Page 182: ...ppm m GOST R S 2052 6 250ppm m H2S GOST K Short Range 250 ppm m 500 ppm m GOST K S 2052 7 250ppm m H2S InMetro Short Range 250 ppm m 500 ppm m InMetro S 2053 3 1000ppm m H2S ATEX Short Range 1000 ppm m 5000 ppm m ATEX BASEEFA S 2053 4 1000ppm m H2S CSA Short Range 1000 ppm m 5000 ppm m CSA UL S 2053 5 1000ppm m H2S GOST R Short Range 1000 ppm m 5000 ppm m GOST R S 2053 6 1000ppm m H2S GOST K Short...

Page 183: ... 25 LEL 0 25 LEL InMetro XC 1022 3 100 LFL CH4 XD Coal ATEX 1 0 LEL 1 0 LEL ATEX BASEEFA XC 1022 4 100 LFL CH4 XD Coal CSA 1 0 LEL 1 0 LEL CSA UL XC 1022 5 100 LFL CH4 XD Coal GOST R 1 0 LEL 1 0 LEL GOST R XC 1022 7 100 LFL CH4 XD Coal InMetro 1 0 LEL 1 0 LEL InMetro XD 1020 3 10 LFL CH4 XD ATEX 0 1 LEL 0 1 LEL ATEX BASEEFA XD 1020 4 10 LFL CH4 XD CSA 0 1 LEL 0 1 LEL CSA UL XD 1020 5 10 LFL CH4 XD...

Page 184: ...For local MSA contacts please visit us at MSAsafety com Because every life has a purpose ...

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