ATI Technologies B12-70 User manual

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O&MManual
B12-70
2-Wire WetAcid
GasTransmitter
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AnalyticalTechnology, Inc.ATI(UK)Limited
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Collegeville, PA 19426 Delph NewRoad, Delph
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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

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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

Model B12-70WetAcidGasTransmitter
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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)

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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)