ATI Technologies B12-70 User manual

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O&MManual
B12-70
2-Wire WetAcid
GasTransmitter
HomeOfficeEuropeanOffice
AnalyticalTechnology, Inc.ATI(UK)Limited
6Iron BridgeDriveUnit 1& 2GateheadBusiness Park
Collegeville, PA 19426 Delph NewRoad, Delph
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Web: www.Analyticaltechnology.com

Model B12-70WetAcidGasTransmitter
O&M Manual-2 -
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TABLEOFCONTENTS
TABLEOF CONTENTS...................................................................................................................2
INTRODUCTION..............................................................................................................................4
SPECIFICATIONS............................................................................................................................6
INSTALLATION...............................................................................................................................7
MECHANICAL MOUNTING..........................................................................................................7
ELECTRICALCONNECTION..........................................................................................................9
WETACID GASSENSOR ASSEMBLY.......................................................................................11
OPERATION..................................................................................................................................13
TRANSMITTER TEST POINTS..................................................................................................13
DIGITAL DISPLAYOPTION.......................................................................................................14
CALIBRATION...............................................................................................................................15
ZERO ADJUSTMENT.................................................................................................................15
SPAN ADJUSTMENT.................................................................................................................15
SENSOR RESPONSE TEST......................................................................................................16
MAINTENANCE.............................................................................................................................17
SPAREPARTSLIST.....................................................................................................................18

Model B12-70WetAcidGasTransmitter
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TABLEOFFIGURES
Figure 1 -TypicalInsertionSystemInstallation (ATI-0156)................................................................... 4
Figure 2 -TypicalFlowThrough SystemInstallation(ATI-0223)........................................................... 5
Figure 3 -Nema4XTransmitterEnclosure Dimensions (ATI-0198)...................................................... 7
Figure 4 -Explosion-ProofTransmitterEnclosureDimensions (ATI-0226)......................................... 8
Figure 5 -WetAcidGasSensorDimensions(ATI-0276)........................................................................ 8
Figure 6 -Electrical Connections (ATI-0181)........................................................................................... 9
Figure 7 -Electrical Connections (ATI-0182)......................................................................................... 10
Figure 8 -WetAcidGasSensorAssembly (ATI-0265)......................................................................... 11
Figure 9 -TransmitterControls & TestPoints (ATI-0227).................................................................... 14

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INTRODUCTION
The SeriesB12-70 isatwo-wiretransmittersystemdesigned forusewith aspecialacidgas
sensor(forHF,HCl,orHBr)suitableforuseinverywetenvironments.It providesalowpowermethod of
monitoring acidgasinapplicationswhereexcessivemoisturecausesrapidblindingofstandardacidgas
sensors.
Transmitters arehoused inaNEMA-4Xpolystyrene enclosure(Figure3)suitableforinstallation
invirtuallyanyenvironment. The sensorcableiswiredto the properterminalsinthe transmitterthrough
the Pg11 cablegland located inone ofthe enclosureknockouts.One cablegland and one ½”conduit
hub issupplied forcustomerinstallation. AnoptionalLCD provideslocalindication ofgasconcentration
on thefront oftheenclosure. The displayissuppliedonlywhenspecified onthe order,andcannot be
added in the field.
B12 Transmitters arealsoavailableinanexplosion-proofversion. The explosion-proofversion is
housedinagalvanizedsteelenclosure(Figure4)rated forClass 1,Div.1,GroupsB,C,&Dlocations.
LCD isnot availableon the XPversion.
Figure1showsatypicalinsertionB12-70gasmonitoringsystem.The sensorisshownthreaded
intoa blind flange ofa vent stack.
Figure1-Typical InsertionSystem Installation(ATI-0156)

Model B12-70WetAcidGasTransmitter
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Figure2showsatypicalflowthrough B12-70gasmonitoring system.The sensorisshownwith
the lowvolumeflowcell inplace.Ifused ininsertionapplications,thelowvolumeflowcell mustbe
removed.
Figure2-Typical FlowThrough System Installation (ATI-0223)

Model B12-70WetAcidGasTransmitter
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SPECIFICATIONS
Type: Wet Acid Gasessuch asHF, HCland HBr
Range: 0-10 PPMMin., 0-100 PPM Max.
Accuracy: ±0.2 PPM at constant temperature
Electronic Repeatability: ±1%ofspan
Electronic Linearity: ±0.5%ofspan
Output: Loop-powered 4-20 mA, 675 ohmsmaximumat 24 VDC
Power: 12-28 VDC
Display: None. OptionalLCD available.
Enclosure: NEMA4Xpolystyrene
Explosion-proofcast iron optional, Class 1, Div. 1, GroupsB,C, &D.
Controls: Zeroand span potentiometers mounted on transmittercircuit board
Operating Temperature: -5ºto+55ºC
Sensor: Model70Wet Acid GasSensor
Weight: 0.25 Lbs(0.12Kg.)

Model B12-70WetAcidGasTransmitter
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INSTALLATION
Installation ofaB12 Transmitterrequiresmechanicallymounting the enclosureand connecting
DC powertothesystem.In addition, thesensormustbe installed asshownineitherfigures1or2and
wired to the properterminalsin the transmitter.
MECHANICALMOUNTING
The NEMA4Xtransmitterenclosureissurfacemounted usingscrewsinserted throughthe blind
mounting holesaccessiblebyremovingthetransmittercover.Figure3showsthe 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.
CAUTION:When removingthecoverofatransmitterwith the LCD option, donot trytoseparate the
coverfromthe enclosurebasebymorethan a fewinches.The LCD ishardwired to thetransmittercircuit
board, and the displaycable isonlya fewincheslong.
Figure3-Nema 4X TransmitterEnclosureDimensions(ATI-0198)
(SHOWNWITH DISPLAYOPTION)

Model B12-70WetAcidGasTransmitter
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Explosion-prooftransmitterenclosuresshould be supported bythe conduit systemand the installation
should include properconduit sealsasrequired bylocalelectricalcode.
Figure4-Explosion-ProofTransmitterEnclosureDimensions (ATI-0226)
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 sensorin aflowconfigurationisused in conjunction with the lowvolumeflowcell(see Figure
2)to provideforsampleto be delivered to the sensorusing apumporthe samplepressurefrom the vent
stack.The sensorsimplythreadsinto the lowvolumeflowcelland¼"hosebarbfittingsareprovided for
inlet and outlet connections.
Figure5-Wet AcidGas SensorDimensions (ATI-0276)

Model B12-70WetAcidGasTransmitter
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ELECTRICALCONNECTION
B12-70transmitters aresuppliedwith agland sealforthesensorwireanda½"conduithubfor
output loop connection. The sensorconnectsto terminalblockTB2on the transmittercircuitboardas
showninFigure6. The outputloopwiringisconnected toTB1asshown inFigure6. The explosion-
prooftransmitterelectricalconnectionsareshowninFigure7.
Figure6-Electrical Connections (ATI-0181)

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Figure7-Electrical Connections (ATI-0182)

Model B12-70WetAcidGasTransmitter
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WETACID GASSENSORASSEMBLY
Wet acid sensors require servicepriortooperation.Sensors areshippeddry.Priortostart-up,a
newmembrane mustbe installed and thesensormustbe filledwithelectrolyte. Figure8showsan
exploded viewofthe sensor.
SENSING ELEMENTBODY(02-0016)
Figure8-Wet AcidGas SensorAssembly(ATI-0265)
Followthe procedurebelow to prepare the sensorforoperation:
1.Unscrewthe electrolyte chamberfromthe assembled moduleandalsoremovethe fillscrewando-
ring fromthe side ofthe sensing element body.
2.Removethe front nutfrom the bottomofthe chamberand discardthe protectivemembrane. O-rings
arecontained ingrooveson both the bottomand topofthe chamber.Besurethattheseo-rings
remain in place.
3.Fromthe package ofmembranessupplied with the sensor,placeanewmembrane into thefront nut.
Themembraneisthewhitediskand is separatedfrom othermembranes byabluepaper
spacer.
4.Screwthe front nut onto thechamberuntilyoufeeltheo-ring compress.Hand tight compression is
all that isneeded. Do not usetoolsto tighten. The membrane shouldbe flat across the bottomof the
chamberwithout wrinkles.
5.Fill the chamberwithelectrolyte untilthelevelisabout½"abovethe bottomofthe internalthreadsin
the chamber.
6.Slowlyscrewthe chamberonto the sensing element body.Asmall amount ofelectrolytewillrun out
ofthe holefromwhichthe fillscrewwasremoved. Placeapapertowelaround thesensorto absorb
the electrolyteoverflow.Tighten the chamberuntil the o-ringat the top ofthe chamberis
compressed. Once again, do not usetoolsto tighten.
7.Shake excess electrolyte fromthe ventholeon the side ofthe sensorand replacethe fillscrewand
o-ring.

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The sensorisnowreadyforoperation. The membrane shouldbestretchedtightlyacross the
tipofthe sensor. Whenhandling theassembledsensor,do not setthesensoron itstipordamage
to themembranewill result.Severeimpactsonthetipof thesensorfrom dropping orother
misuse maycause permanent damage to thesensor.

Model B12-70WetAcidGasTransmitter
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OPERATION
Aftermechanicaland electricalinstallation iscomplete,the systemisreadyforoperation. Prior
to start-up,recheckthe loopwiringandsensorconnectionstobesureeverythingiscorrect.Reversing
the loopwiring will not damage the transmitter, but otherdevicesin the loop maybe adverselyaffected.
AssoonasDCloop powerisapplied, the transmitterwillbegintooperate, transmitting a4-20
mAsignalproportionaltogasconcentration. When firstenergized,thesensorwill spiketo ahighvalue
and then slowlybeginto recovertowardzero. Thisisnormaland the systemmustbe allowed to stabilize
forat leastafewhours beforemaking anyadjustments.The sensormustbe connected tothe 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
6)that allowanoperatorto read the4-20 mAoutput without breaking the loop wiring. The testpointsare
across aprecision 10 ohmresistorthat ispartofthe current output circuit. Therefore, anychangesat the
testpoint areadirectindicationofchangesinthe output signal.The testpoint voltagewill be 40-200
mv. proportionalto 4-20 mA. Thistest point isused forzeroand calibration functions.

Model B12-70WetAcidGasTransmitter
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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.
Figure9-TransmitterControls& Test Points(ATI-0227)

Model B12-70WetAcidGasTransmitter
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CALIBRATION
Transmittercalibration requiresadjustment ofboth zeroand span. Zeroisadjusted when the
sensorisexposed toaircontaining no acidgases.Spanisadjustedwhen agasstreamcontaining a
known concentrationofacid gasispassed through the lowvolume flowcell.
ZEROADJUSTMENT
Aspreviouslymentioned, adjusting thetransmitterzerorequiresthat the sensorbe exposed to
acidgasfree air.The simplestapproachistosimplyexposethesensorto ambient airthat isfree of
gasestowhichthe sensorwillrespond.Threadingthelowvolumeflowcellontothesensorwill isolate
the sensorfromsurrounding airforzeroing purposes.
Ifthe areainwhichthe sensorisoperatingisknownto begasfree, thenthetransmittercan be
zeroedwithout furtherequipment. Ifnot, useof“zeroair” fromagascylinderisrecommended. Zeroair
isavailableaspartofallATIcalibration kits,ormaybeobtained fromanyspecialtygassupplier.When
zeroairisto beused, alowvolumeflowcell(partno.00-0422)mustbe used.The lowvolumeflowcell
providesaconfined spacearoundthesensorintowhichthe zeroaircanflow.Lowvolumeflowcells
provide tube fittingsatthe bottomto connect airtubing asshown in Figure 2.
Tozerothetransmitter,removethe coverandconnectaDVMtothe testpointsshowninFigure
6. Observethe DVMvalueto be surethat itisnolongerdeclining, andthat itisstable±4mv.Usethe
zeropotentiometer(Figure6)to adjustthe testpoint voltage to0.040 VDC (40mv.).Ifthe transmitteris
supplied with the LCD option, noDVM isrequired.
SPANADJUSTMENT
Oncethe zerohasbeen set, threadthe lowvolumeflowcell onto the sensor(ifitisnot already
therefromzeroing).Attachasourceofgaswithaknowacidgasconcentrationandadjustthe sample
flowrateto 500cc/min. Forconvenience, chlorinegasmaybeused asasimulant forcalibration. Atypical
chlorine gassourceistheelectrochemicalchlorinegeneratormanufactured byAdvancedCalibration
Designsin Tucson, AZ. Allowsample to flow for10 minutes.
ObservetheDVMvalue. The reading shouldbe relativelystable±4mv.Adjustthe span
potentiometer(Figure6)untilthe propertestpoint voltageisobtained. The propervoltage to set when
adjustingtransmitterspanwillvarydepending on therangeofthetransmitter.The following formulais
used tocalculatetheproperspan voltage foranytransmitter.
V = 0.040 V + [0.160X (Measured Concentration ÷Transmitter Range)]
Asanexample,supposeyou arecalibrating atransmitterwitharangeof0-10 PPM,andthe
chlorine gasstandard used forcalibrationhasavalue of5 PPM. The above formulawould thenbecome:
V = 0.040 V + [0.160X (5 ÷10)] = 0.120V.
Therefore, adjusting the transmitterto a reading of120 mv. at the test point wouldproperly
calibrate the transmitter.

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SENSORRESPONSETEST
Whilezeroandspan adjustmentsare required onlyperiodically,gassensors shouldbe checked
regularlyforproperresponse. The responsetestcan be doneusing powdered calciumhypochlorite
(HTH)available fromanyswimming poolsupply.
The sensorresponsetestwillcreate aconditionwherealarmrelayswillbeactivated unless
theyareinhibited.To observe the responseatthetransmitterwithoutdisplay,it isnecessaryto connecta
DVMtothe testpointsindicated inFigure6.Ifthe transmitterissupplied withthe LCD option, no DVMis
required.
Placeateaspoonofcalciumhypochlorite intoaplastic bottleand keepthebottlecapped until
readytotestthe sensor. Open the bottleand placethe mouth nearthe sensor.The DVMreading will
riserapidly.Immediatelyremovethe bottleasitisbestto exposethe sensorto the high concentrations
asbrieflyaspossible. Ifthe sensordoesnot respond when thebottleisheldnearthe sensor,thesensor
membrane and electrolyteshould bereplaced.

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MAINTENANCE
The onlymaintenancerequired onthe B12-70 systemisperiodicsensorservice. The wet acid
gassensorusesamicroporousmembrane that can losesensitivitywith theaccumulation ofsolidsor
precipitatesinthemembrane. Asapreventivemeasure, sensors shouldberebuiltwith newmembrane
and electrolyte about every3-4 months.
Followthesensorassemblyprocedureonpages10and 11 ofthismanualto replacethe
membrane and electrolyte.

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SPAREPARTSLIST
PARTNO.DESCRIPTION
01-0065B12-69/70Wet Oxidant/Acid transmitterPCB(10-100 PPM)
01-0113B12/69/70 Wet Oxidant/Acid transmitterPCB(1-10PPM)
81-0002NEMA4Xenclosure(top and bottom)
03-0039Explosion-proofEnclosureAssembly
38-0002Terminalblockplug, 2 position
92-0005Self-tapping screws, (pkg. of4), (forNEMA-4enclosure)
92-0007Self-tapping screws, (pkg. of4), (forExplosion-proofenclosure)
44-0017Pg 16 to½"NPTconduithub with nut
44-0018Sealring (required forNEMA4Xrating on conduithubs)
00-0077Wet oxidant/acidgassensor
02-0016Sensing element body(for#00-0077)
03-0029Sensorinterconnect cable, 25 ft.
45-0007Electrolyte chamber
45-0010Front Nut, noryl
05-0035*Membranes, pkg. of10
05-0004*SparePartsKit, screw &o-ring
09-0016*Wet acid gassensorelectrolyte, 4 oz(120 cc)
Note:Instrument issuppliedwith sufficient spare partsfor6-12 monthsofoperation. For2 yearspare
partsinventory, 2 eachofthe itemsmarked withan asterisk(*)should be ordered.

PRODUCT WARRANTY
AnalyticalTechnology,Inc.(Manufacturer) warrantstotheCustomerthatifany
part(s)ofthe Manufacturer's equipmentprovestobe defectiveinmaterialsor
workmanshipwithintheearlierof18monthsof thedateofshipmentor12monthsofthe
dateofstart-up,suchdefectivepartswillbe repairedorreplaced free ofcharge.
Inspection and repairstoproductsthoughttobe defectivewithinthewarrantyperiod will
be completed atthe Manufacturer's facilitiesinCollegeville,PA. Productson which
warrantyrepairsarerequired shall be shippedfreightprepaidtotheManufacturer.The
product(s)will be returned freightprepaidand allowed ifitisdeterminedbythe
manufacturerthatthepart(s)failed duetodefectivematerialsorworkmanship.
Thiswarrantydoesnotcoverconsumableitems,batteries,orwearitems
subjecttoperiodicreplacementincludinglampsandfuses.
Gassensorscarrya12 monthsfromdateof shipmentwarrantyand aresubject
toinspectionforevidenceofmisuse,abuse,alteration,improperstorage,orextended
exposuretoexcessivegasconcentrations.Shouldinspection indicatethatsensors
havefailed duetoanyoftheabove, the warrantyshall notapply.
TheManufacturerassumesnoliabilityforconsequentialdamagesofanykind,
and thebuyerbyacceptanceofthisequipmentwill assumeall liabilityforthe
consequencesofitsuseormisusebythe Customer, hisemployees, orothers. A defect
withinthe meaningofthiswarrantyisanypartofanypieceofaManufacturer's product
whichshall,when suchpartiscapableof beingrenewed,repaired,orreplaced,operate
tocondemnsuchpieceofequipment.
Thiswarrantyisinlieuofall otherwarranties(includingwithoutlimitingthe
generalityofthe foregoingwarrantiesofmerchantabilityand fitness foraparticular
purpose),guarantees,obligationsorliabilitiesexpressed orimplied bythe Manufacturer
oritsrepresentativesand bystatuteorruleoflaw.
Thiswarrantyisvoidifthe Manufacturer'sproduct(s)hasbeensubjectto
misuseorabuse,orhasnotbeen operatedorstored inaccordancewithinstructions,or
ifthe serialnumberhasbeenremoved.
AnalyticalTechnology,Inc.makesno otherwarrantyexpressed orimplied
except asstatedabove.

WATERQUALITYMONITORS
DissolvedOxygen
Free Chlorine
CombinedChlorine
Total Chlorine
ResidualChlorine Dioxide
PotassiumPermanganate
DissolvedOzone
pH/ORP
Conductivity
HydrogenPeroxide
PeraceticAcid
DissolvedSulfide
ResidualSulfite
Fluoride
DissolvedAmmonia
Turbidity
SuspendedSolids
Sludge BlanketLevel
MetriNetDistribution Monitor
GASDETECTIONPRODUCTS
NH3Ammonia
COCarbon Monoxide
H2Hydrogen
NONitric Oxide
O2Oxygen
COCl2 Phosgene
Br2Bromine
Cl2 Chlorine
ClO2Chlorine Dioxide
F2Fluorine
I2 Iodine
HXAcidGases
C2H4OEthyleneOxide
C2H6OAlcohol
O3Ozone
CH4Methane
(Combustible Gas)
H2O2HydrogenPeroxide
HCl HydrogenChloride
HCN HydrogenCyanide
HFHydrogenFluoride
H2SHydrogenSulfide
NO2NitrogenDioxide
NOxOxides of Nitrogen
SO2SulfurDioxide
H2SeHydrogenSelenide
B2H6Diborane
GeH4Germane
AsH3Arsine
PH3Phosphine
SiH4Silane
HCHOFormaldehyde
C2H4O3 PeraceticAcid
DMADimethylamine