ATI Technologies B12-71 User manual

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O&MManual
B12-71
2-Wire Hydrogen
GasTransmitter
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AnalyticalTechnology, Inc.ATI(UK)Limited
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Collegeville, PA 19426 DelphNewRoad, Delph
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Model B12-71 WetHydrogenGasTransmitter
O&M Manual-2 -
Rev-D, 7/15
TABLEOFCONTENTS
TABLEOF CONTENTS...................................................................................................................2
INTRODUCTION..............................................................................................................................4
SPECIFICATIONS............................................................................................................................8
INSTALLATION...............................................................................................................................9
MECHANICAL MOUNTING..........................................................................................................9
ELECTRICALCONNECTION........................................................................................................12
HYDROGEN SENSORASSEMBLY..............................................................................................14
OPERATION..................................................................................................................................16
TRANSMITTER TEST POINTS..................................................................................................16
DIGITAL DISPLAYOPTION.......................................................................................................17
CALIBRATION...............................................................................................................................18
ZERO ADJUSTMENT.................................................................................................................18
SPAN ADJUSTMENT.................................................................................................................18
MAINTENANCE.............................................................................................................................19
SPAREPARTSLIST.....................................................................................................................20

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-3 -
Rev-D, 7/15
TABLEOFFIGURES
Figure 1 -Typical %Version Insertion SystemInsallation (ATI-0156).................................................. 4
Figure 2 -TypicalPPMRemote Version Insertion SystemInstallation (ATI-0165).............................. 5
Figure 3 -TypicalPPMStandardVersion Insertion SystemInstallation (ATI-0166)........................... 6
Figure 4 -TypicalFlowThrough SystemInstallation(ATI-0223)........................................................... 7
Figure 5 -Nema-4XEnclosure DimforRemote PPM& %Versions (ATI-083)..................................... 9
Figure 6 -Nema-4XEnclosure DimforStd. PPMVersions (ATI-0198)............................................... 10
Figure 7 -Enplosion-ProofTransmitterEnclosureDimensions (ATI-0226)....................................... 10
Figure 8 -WetHydrogenGas SensorDimensionsall Versions (ATI-0276)........................................ 11
Figure 9 -Electrical Connections, Nema-4Enclosure (ATI-0288)....................................................... 12
Figure 10 -Electrical Connections, Explosion-ProofEnclosure (ATI-0289)....................................... 13
Figure 11 -%HydrogenGas SensorAssembly(ATI-0290).................................................................. 14
Figure 12 -TransmitterControls & TestPoints (ATI-0291).................................................................. 17

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-4 -
Rev-D, 7/15
INTRODUCTION
The SeriesB12-71isatwo-wiretransmitterdesignedtoworkwithATI'sModel71Wet
Hydrogen GasSensor.It provide alowpowermethod ofmonitoringhydrogen inmoisturesaturated gas
streams.
GAS CODENO. STD. RANGE
MIN. RANGEMAX. RANGE
HYDROGEN 71 4% 0-1% 0-10%
HYDROGEN 71 2000PPM 0-500 PPM 0-5000 PPM
Figure1 showsa typicalB12-71 Hydrogen monitoringsystemfora vent orduct system.
Figure 1 -Typical%Version Insertion SystemInsallation (ATI-0156)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-5 -
Rev-D, 7/15
Figure 2 -TypicalPPMRemote Version Insertion SystemInstallation (ATI-0165)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-6 -
Rev-D, 7/15
Figure 3 -TypicalPPMStandardVersion Insertion SystemInstallation (ATI-0166)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-7 -
Rev-D, 7/15
Figure4showsatypicalflowthrough B12-71gasmonitoring system.The sensorisshownwith
the flowcell inplace. Ifused ininsertion applications, the flowcell must be removed.
Figure 4 -TypicalFlow Through SystemInstallation(ATI-0223)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-8 -
Rev-D, 7/15
SPECIFICATIONS
Type: Wet Hydrogen Gas
Range: 0-1%Min., 0-10%Max.
0-500 PPMMin., 0-5000PPMMax.
Accuracy: ±0.05 %at constant temperature
Electronic Repeatability: ±1%ofspan
Electronic Linearity: ±0.5%ofspan
Output: Loop-powered 4-20 mA, 675 ohmsmaximumat 24 VDC
Power: 12-30 VDC
Enclosure: NEMA4Xpolystyrene
Controls: Zeroand span potentiometers mounted on transmittercircuit board
Operating Temperature: 0ºto+55ºC
Sensor: Model71Hydrogen Sensor
SampleFlowRequirements (Whenusing Flowcell): 500-2000 cc/min.
Weight: 0.25 Lbs(0.12Kg.)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-9 -
Rev-D, 7/15
INSTALLATION
Installation ofaB12 Transmitterrequiresmechanicallymounting the enclosureand connecting
DC powerto the system.Inaddition, the flowcell assemblyforthe sensormustbe connectedto sample
inlet andoutlet tubing.Hosebarbsaresupplied ontheflowcell,and theinlet and outlet portsaresuitable
fora varietyoffitting with 1/8"NPTconnections.
MECHANICALMOUNTING
The NEMA4Xtransmitterenclosureissurfacemounted usingscrewsinserted throughthe blind
mounting holesaccessiblebyremovingthetransmittercover.Figure5showsthe centertocenter
mounting holedimensionsforthisenclosure. Ifrigidconduitisto be used forwiringthetransmitter,the
transmittercan be supported directlyfromthe conduitsystemwithout the useofmountingscrews.The
transmitterweighsonly4ounces,sonormalconduitsupportswillbe adequate. If conduitistobe used,
be surethat theconduitissealedat the point wereitenters thetransmitter.Otherwise, condensationin
the conduit systemcan drain into the transmittercausing failure ofthe electroniccircuit board.
Figure 5 -Nema-4XEnclosure DimforRemote PPM & %Versions (ATI-083)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-10 -
Rev-D, 7/15
Figure 6 -Nema-4XEnclosure DimforStd. PPMVersions (ATI-0198)
Explosion-prooftransmitterenclosuresshouldbe supportedbytheconduitsystemand the
installation should include properconduitsealsasrequired bylocalelectricalcode.
Figure 7 -Enplosion-ProofTransmitterEnclosureDimensions (ATI-0226)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-11 -
Rev-D, 7/15
The backofthe insertion sensorisa1¼"MNPTpipethread. The sensorisnormallythreaded
intoa blind flange whichisused to mount tothevent. The sensorshouldbe installedperpendiculartothe
airflowand should be inserted farenough into the ventso that the sensortip isat least ½"into the stack.
The sensorinaflowconfigurationisused inconjunction withthe lowvolumeflowcell (see Figure
8)to provideforsampleto be delivered to the sensorusing apumporthe samplepressurefrom the vent
stack.
Figure 8 -WetHydrogenGas SensorDimensionsall Versions (ATI-0276)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-12 -
Rev-D, 7/15
ELECTRICALCONNECTION
B12-71transmitters aresupplied withaglandsealforthe sensorwireand a½"conduithubfor
output loopconnection.The sensorconnectsto aterminalblock(TB2)on the transmittercircuitboard.
The outputloopwiringisconnectedtoTB1asshown inFigure9. The explosion-prooftransmitter
electricalconnectionsareshownin Figure 10.
Figure 9 -Electrical Connections, Nema-4Enclosure (ATI-0288)
NOTE
: GREENConductorused
on PPMVersionof
sensorONLY. Ifusing
%sensor, wireusing
BLUE conductor.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-13 -
Rev-D, 7/15
Figure 10 -Electrical Connections, Explosion-ProofEnclosure (ATI-0289)
NOTE
: GREENConductorused
on PPMVersionof
sensorONLY. Ifusing
%sensor, wireusing
BLUE conductor.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-14 -
Rev-D, 7/15
HYDROGEN SENSORASSEMBLY
The %hydrogensensorsuppliedwiththeB12-71isshippeddry.Itwillnotoperateuntilitis
preparedbyadding electrolyteandamembrane. Preparationofthesensorforoperationmustbe done
carefully.The procedureshouldbe donebyaqualifiedtechnician, anditshouldonlybedonewhen the
systemisreadyforoperation. Until then, itisbesttoleavethe sensorinthe conditioninwhichitis
received.
FILL SCREW(92-0048)
Figure 11 -%HydrogenGas SensorAssembly (ATI-0290)
Followthe procedurebelow to prepare the hydrogen sensorforoperations:
1.Unscrewthe electrolytecanisterfromthe assembled sensorand alsoremovethevent screwfromthe
side ofthe sensorbody.
2.Removethe membrane capfrom the bottomof the canisterand discardthe protectivemembrane. O-
ringsarecontainedingrooveson boththe bottom andtopofthecanister.Besurethat theseo-rings
remain in place.
3.Fromthe package ofmembranessuppliedwiththesensor,placeanewmembrane intothe
membrane cap.Themembraneisclearand isseparatedfromothermembranesbyapaper
spacer.
4.Screwthe membrane capon to the canisteruntil you feelthe o-ringcompress.Hand tight
compression isallthatisneeded. Donotusetoolsto tighten. The membrane shouldbe flat across
the bottomofthe canisterwithout wrinkles.
5.Fillthecanisterwith electrolyte untilthe levelreachesthe bottomofthe internalthreads.
CAUTION:The electrolyte usedinthehydrogensensoris veryacidic. Avoidskincontactorany
contactwith eyes. Ifcontactoccurs, flushwith large amounts of water.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-15 -
Rev-D, 7/15
6.Slowlyscrewthecanisteronto the sensorbody.Asmallamount ofelectrolytewillrun outofthe hole
fromwhichthevent screwwasremoved. Placeapapertowelaround the sensorto absorbthe
electrolyteoverflow.Tightenthe canisteruntilthe o-ring atthe top ofthe canisteriscompressed.
Once again,do not use tools to tighten.
7.Shake excess electrolyte fromthe ventholeon the side ofthe sensorand replacethe vent screw.
The sensorisnowreadyforoperation. The membrane shouldbe stretched tightlyacross the tip
ofthe sensor.Whenhandling theassembledsensor,do not setthesensoron itstipordamageto
themembranewill result.Severeimpactsonthetipof thesensorfromdropping orothermisuse
maycause permanent damage to the sensor.
PPMH2Sensor
The PPMWet Hydrogen sensorisa sealed, maintenance free electromechanicalcell. It hasa 2
yearlife expectancyand isreplaceable.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-16 -
Rev-D, 7/15
OPERATION
Aftermechanicaland electricalinstallationiscomplete, the systemisreadyforoperation. Priorto
start-up, recheckthe loopwiringandsensorconnectionstobesureeverythingis correct. Reversingthe
loopwiring will not damagethe transmitter, but otherdevicesinthe loop maybeadverselyaffected.
Assoon asDC loop powerisapplied, the transmitterwillbeginto operate, transmittinga4-20 mA
signalproportionaltogasconcentration. When firstenergized, the sensorwill spiketo ahigh value and
then slowlybeginto recovertowardzero. Thisisnormaland the systemmustbeallowedto stabilizefor
at leastafewhours beforemaking anyadjustments.The sensormustbe connected to the transmitter
and the transmittermust be powered forthe sensorto stabilize.
TRANSMITTERTESTPOINTS
In orderto readthe transmitteroutput locally,adigitalvolt(DVM)meterisrecommended for
transmitters without displays.The transmittercircuitboardcontainstestpointsmarked TP1(see Figure
12)that allowanoperatorto readthe4-20mAoutputwithoutbreakingtheloopwiring. The testpoints
areacross aprecision 10 ohmresistorthat ispart of thecurrent output circuit. Therefore, anychangesat
the test point area directindicationofchangesin the outputsignal. The test point voltage will be40-200
mv. proportionalto 4-20 mA. Thistest point isused forzeroand calibration functions.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-17 -
Rev-D, 7/15
DIGITALDISPLAY OPTION
SeriesB12 transmitters suppliedwiththeoptionalLCDhavethedisplaymounted tothe
enclosurecoverwithaclearlensprotecting thedisplayfromdirtand moisture. The displayisconnected
to the coverwithashortribbon cablesoldered tothetransmittercircuitboard.The digitaldisplayis
factoryscaled to the transmitterrange specified on the order.
The LCD indicatesgasconcentration directlyinPPMor%depending on therange. It isdirectly
inthe4-20mAoutput circuitsothat itisaveryaccurate indicatorofthe signalbeing transmitted to
remote equipment. The displayshouldbe usedforzeroing and calibration instead ofthe testpoints
describedinthecalibration section ofthismanual.
When removingthecoverofatransmitterwith the LCD, becarefulnot topullon the display
interconnectcable. When youremovethe cover,itcanbe temporarilyfastenedto the enclosurebaseas
shownin Figure9.
Figure 12 -TransmitterControls & TestPoints (ATI-0291)

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-18 -
Rev-D, 7/15
CALIBRATION
Transmittercalibrationrequiresadjustment ofbothzeroandspan.Zeroisadjusted when the
sensorisexposed toagasstreamcontainingnohydrogen.Adjusting the span requiresthatthesensor
be placedina gasstreamcontaining a known hydrogen concentration.
ZERO ADJUSTMENT
Aspreviouslymentioned,adjustingthesensing modulezerorequiresthatthesensorbeexposed
to agasstreamthat doesnot containhydrogen.Ifthe sensorhasjustbeen rebuiltorifthesystemis
being startedupforthefirsttime, leavethe sensorinthe ambient airforatleast3-4hours tocometo a
stablezero. If the systemhasbeen inoperation, 10minutesissufficient to get agood zero. Do not allow
the sensorto operate in drygasstreamsforextendedperiodsoftime orthe sensitivitywilldecrease.
Tozerothetransmitter,removethe coverandconnectaDVMtothe testpointsshowninFigure
6. Observethe DVMvalueto besurethatitisnolongerdeclining, and thatitisstable±4mv.Usethe
zeropotentiometerto adjustthe testpointvoltage to 0.040VDC (40 mv.).Ifthe transmitterissupplied
with the LCD display, simplyadjust the potentiometeruntilthe displayreads0.0.
SPAN ADJUSTMENT
Once the zerohasbeen set, insert the sensorintotheflowcelland turnon thegasflowcontaining
aknown hydrogenconcentration. The recommended gasflowrateisbetween200and1000cc/min.
Allowthe gassample to flowforat least 5 minutes.
Observethe DVMvalue. The readingshouldbe relativelystable±4mv.Adjustthe span
potentiometer(Figure6)untilthe propertestpoint voltageisobtained. The propervoltage to set when
adjustingtransmitterspanwillvarydepending on therangeofthetransmitter.The following formulais
used to calculate the properspan voltage foranytransmitter.Ifthe transmittercontainsan LCD display,
simplyadjust the span potentiometeruntilthedisplayindicatesthespan gasconcentration.
V=0.040V+0.160X(MeasuredConcentration ÷Transmitter Range)
Asan example, supposeyou arecalibrating atransmitterwitharange of0-2%.The knowgas
sample contains1.5%hydrogen. The above formula would then become:
V=0.040V+0.160X(1.5÷2)=0.160 V.
Therefore, adjusting the transmitterto areading of160 mv.at the testpoint wouldproperly
calibrate the transmitter.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-19 -
Rev-D, 7/15
MAINTENANCE
The onlymaintenancerequiredon the B12-71 systemisperiodicsensorservice.The %
hydrogensensorusesamembrane thatcan loosesensitivitywith the accumulation ofsolidsor
precipitatesinthemembrane. Asapreventivemeasure, sensors shouldberebuiltwith newmembrane
and electrolyteaboutevery2-3months.The electrolyte inthe sensorshouldalwaysbechanged when
the membrane ischanged. The PPMhydrogensensorismaintenancefreeandsimplyrequires
replacement.

Model B12-71 WetHydrogenGasTransmitter
O&M Manual-20 -
Rev-D, 7/15
SPAREPARTSLIST
PARTNO.DESCRIPTION
01-0067B12-71 transmitterPCB(%Version)
01-0193B12-71 Standard TransmitterPCB(PPMVersion)
01-0194B12-71 Remote TransmitterPCB(PPMVersion)
81-0002NEMA4Xenclosure(top and bottom)
03-0039Explosion-proofEnclosureAssembly
38-0002Terminalblockplug, 2 position
92-0005Self-tapping screws, (pkg. of4), (forNEMA4 enclosure)
92-0007Self-tapping screws, (pkg. of4), (forExplosion-proofenclosure)
44-0017Pg 16 to½"NPTconduithub with nut
44-0018Sealring (required forNEMA4Xrating on conduithubs)
00-0781%Wet Hydrogen gassensor
00-1345A10-71Wet standard sensor(PPM version)
00-1346A10-71Wet remote sensor(PPMversion)
02-0069Sensing element body(for#00-0781)
03-0029Sensorinterconnect cable, 25 ft. (% version only)
31-000125ft. 5 cond. shielded cable(PPM version)
00-0422FlowcellAssembly(% version)
00-0255FlowcellAssembly(PPMversion)
45-0007Electrolyte chamber
45-0010Front Nut, noryl
05-0025*Membranes, pkg. of10
05-0028*SparePartsKit, screw &o-ring
09-0022*Hydrogensensorelectrolyte, 4 oz(120 cc)
Note: Instrument issupplied withsufficient sparepartfor6-12 monthsofoperation. For2yearspare
partsinventory, 2 eachofthe itemsmarked withan asterisk(*)should be ordered.