ATI Technologies A12-17 User manual

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O&MManual
A12-17
CombustibleGasTransmitter
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A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -2 -
TABLEOFCONTENTS
INTRODUCTION................................................................................................................................................................. 3
SPECIFICATIONS............................................................................................................................................................... 7
INSTALLATION.................................................................................................................................................................. 8
SENSOR LOCATION........................................................................................................................................................10
INTERFERENCES............................................................................................................................................................10
ELECTRICAL CONNECTIONS –TRANSMITTER.......................................................................................................11
DUAL CONDULET SYSTEM..........................................................................................................................................13
A12-17 TO B14 CUSTOMER WIRING DIAGRAM.........................................................................................................15
A12-17 TO GENERIC INSTRUMENT WIRING DIAGRAM..........................................................................................16
OPERATION........................................................................................................................................................................17
START-UP.........................................................................................................................................................................17
START-UP DELAY...........................................................................................................................................................18
FRONT PANEL MAGNETIC CONTROLS......................................................................................................................18
LIQUID CRYSTAL DISPLAY..........................................................................................................................................19
MENU SEQUENCE...........................................................................................................................................................20
Figure14 cont’d - TransmitterProgramChart............................................................................................................21
TRANSMITTER MODE SELECTION.............................................................................................................................22
INFORMATION MODE....................................................................................................................................................22
TEST MODE......................................................................................................................................................................22
MANUAL AUTO-TEST ACTIVATION...........................................................................................................................22
ANALOG OUTPUT SIMULATION.................................................................................................................................23
CALIBRATION...................................................................................................................................................................24
ZERO ADJUSTMENT.......................................................................................................................................................24
SPAN ADJUSTMENT.......................................................................................................................................................25
MAOUTPUT ADJUSTMENT...........................................................................................................................................26
AUTO-TEST ENABLE/DISABLE SELECTION (UNITSWITH AUTO-TEST)...................................................................26
CALIBRATION FOR OTHER COMBUSTIBLE GASES................................................................................................27
SENSOR RESPONSE TEST..............................................................................................................................................27
ERROR MESSAGES........................................................................................................................................................28
SENSOR REPLACEMENT...............................................................................................................................................29
SPAREPARTSLIST...........................................................................................................................................................30

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -3 -
TABLEOFFIGURES
FIGURE1-TRANSMITTER COMPONENTS............................................................................................. 5
FIGURE2-TYPICALSYSTEM DIAGRAM................................................................................................. 6
FIGURE3-GASTRANSMITTER DIMENSIONS, NOAUTO-TEST........................................................... 8
FIGURE4-GASTRANSMITTER DIMENSIONS,WITH AUTO-TEST....................................................... 9
FIGURE5-TRANSMITTER CONNECTIONS,NOAUTO-TEST.............................................................. 11
FIGURE6-TRANSMITTER CONNECTIONSWITH AUTO-TEST........................................................... 12
FIGURE7-DUAL CONDULETCONNECTIONS,SENSORW/OAUTO-TEST....................................... 13
FIGURE8-DUAL CONDULETCONNECTIONS,SENSORWITH AUTO-TEST..................................... 13
FIGURE9-DUAL CONDULETTYPICALINSTALLATION....................................................................... 14
FIGURE10 -B14 RECEIVER CONNECTIONS........................................................................................ 15
FIGURE11 -GENERICINSTRUMENTCUSTOMERWIRING................................................................. 16
FIGURE12 -MODELA12-17 FRONTPANEL.......................................................................................... 18
FIGURE13 -LIQUID CRYSTAL DISPLAY................................................................................................ 19
FIGURE14 -TRANSMITTERPROGRAM CHART................................................................................... 20
FIGURE15 -CALIBRATION ADAPTERASSEMBLY............................................................................... 24

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -4 -
INTRODUCTION
The modelA12-17 isan advanced combustiblegastransmitterprovidingreliablemeasurement of
combustiblegaslevelsinindustrialplant environments.A12-17transmitters combine catalyticbead type
gassensors and an electronicamplifierthat transmitsgasconcentration using astandard4-20 mAsignal.
Transmitterelectronics provide alocalLCD displayofgasconcentration and containmagneticcontrolsto
allowtesting andcalibration without openingthe enclosure. Typicalapplicationsareambient air
monitoringnearprocess tanksorpiping,orinenclosed spaceswherecombustiblegasesmayleakor
accumulate.
The A12-17transmitters arecomposed oftwomainparts,thegassensingelement andthe
electronictransmitter.The sensorisanexplosion-proof assemblymade of type316 stainless steelwith a
flamearrestorbondedat the sensingend. The electronictransmitterisaplug-inmodulehousedinan
explosion-proof castaluminumhousing withan epoxypowdercoating suitableforareasdesignated Class
I, GroupsB, C, &D; Class II, GroupsE&F,and Class III. Sensors are normallyscreweddirectlyinto the
transmitterenclosureand connected withashortcable. However,sensors can be mounted remote from
the transmitterup to50feet, provided thatsensorcablesareproperlyprotected inexplosion-proof
conduit.

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -5 -
A12-17 TRANSMITTERMODULE
EXPLOSION-PROOFENCLOSURE
RELAY BASE
WALL MOUNTBRACKET
PLUGTRANSMITTERMODULE INTO THERELAY BASE
VIA THERELAY PLUGMOUNTEDONTHEBOTTOM
OFTHETRANSMITTERMODULE.
¾” NPT
¾” NPT
C10-17 COMBUSTIBLE SENSOR
¾”NPT
13/8
”FLATS
1¼”NPT
C28-17 COMBUSTIBLE SENSOR
WITHAUTO-TEST
1/8”TUBEI.D.,BARBFITTING
1¼”NPT
SPLASHGUARD (00-0789)
Figure 1 -TransmitterComponents

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -6 -
ModelA12-17 transmittersareavailablewithauniquesensorverification system called Auto-Test.
Thisoptionconsistsofaminiaturegasgeneratorincorporatedinto the explosion-proofsensorassembly
whichautomaticallygeneratesacombustiblegasevery24hours.The gasgeneratorfunction is
controlledbythemicrocontrollerinthe transmitterelectronics.When activated,thegeneratorwillprovide
atrue gastestofthe combustiblegassensingelement, and willautomaticallyalertoperators to sensor
problemsthat might developdue tosensorpoisoning orcoating. Figure1showsboth astandardsensor
and a sensorequipped withthe Auto-Test generator.
The Auto-Testfeatureprovidesdailyverification ofsensorresponse. Whileitisnot intendedto
replacecalibration, theautomaticsensortestgreatlyreducesthe amount ofmanualtestingrequired to
assurethat thegasdetection systemisfunctioning properly.Shouldasensorfail to respond tothe gas
test, the4-20mAsignalfrom the transmitterislocked at 3mA,providingatroublesignaltoanyreceiving
equipment.
Atypicalinstallation forthe A12-17isshowninFigure2below.It isshownconnected to ATI’sseries
B14singlechannelreceiver,butthetransmittermaybeuseddirectlywith PLC, DCS,orcomputer
monitoring systemswithoutthe use ofa specialreceiver.
4-20mAOUTPUT
(3)SPDT,10A,ALARMRELAYS
(1) SPDT,10A, TROUBLERELAY
3COND. 20 AWGUNSHIELDEDORSHIELDEDCABLE
POWER,85-255VACorVDC
A12-17TRANSMITTER
C28-17 GAS SENSORWITHAUTO-TEST
(SHOWNWITHSPLASHGUARD)
Figure 2 -TypicalSystemDiagram

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -7 -
SPECIFICATIONS
Range: 0-100%LEL (LowerExplosive Limit)
Display: 3 DigitLCD
Response Time (T90): 10 Seconds
Sensitivity: 1%LEL
ZeroDrift: <2%/Month
Power: 12-28 VDC,12VDC at 150mAnominal, 200mAmax.
24 VDC at75mAnominal, 100mAmax.
Output:4-20 mADC,375 ohmsmaximumload at 12 VDC
850 ohmsmaximumload at 24 VDC
1000 ohmsmaximumload at28 VDC
Controls: Fourmagneticcontrolswitchesoperable through glass window
Temperature Limits: -40°to +70°C.
SensorType: Catalyticbead type, poison resistant
SensorOption: Auto-Test gasgenerator
SensorMaterials: 316 Stainless Steel
TransmitterEnclosure: Cast AluminumwithEpoxyCoating,Glass window
Area Classification: NEC Class I, GroupsB,C, &D, Class II, GroupsE, F&G, Class III
Connections: 3wire,20 AWG, 500 feet max. (150 m.)
SensorCable Length: Maximum50 feet forseparation between sensorandtransmitter
Weight: 4 lbs. (1.4 Kg.)

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -8 -
INSTALLATION
Combustiblegassensor/transmitters areexplosion-proofassembliesthatarenormallymounted
directlytosuitableexplosion-proofconduit. Tomaintaintheexplosion-proofintegrityofthe transmitter,a
suitablecableentrysealmustbe used inaccordancewith theapplicableelectricalcode.
Sensor/transmitters shouldbe mounted with the sensorfacing downasshowninFigure3and4. A12-17
transmitters arealsosupplied with amountingbracket that can beused to securethe unitto awall or
plate.
NOTE: Gassensors withoutauto-testareshipped withaprotectiveplasticcap overtheend. Thiscap
shouldbe leftinplaceto avoiddamage to thesensorduring installation. If thedetection system
isto be activated withinafewdaysofinstallation, thecap shouldbe removed when installation
iscomplete. Otherwise, leavethe cap inplaceuntilthe systemisto be placedinservice. Be
sureto leavetheprotectivecapon thesensorifpainting is to bedoneinthearea of the
sensor.
C10-17COMBUSTIBLE SENSOR
¾”NPT
¾”NPT
11/8”HEX
WALLMOUNTBRACKET
(2)5/16”DIA. THRU
SECURE BRACKETTOWALL
-HARDWARE ISCUSTOMER
SUPPLIED
CONDUITENTRY,¾”NPT
(ANYCONNECTIONMADEMUST
BE WATER-TIGHT,
¾”NPT
Figure 3 -Gas TransmitterDimensions, NoAuto-Test

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -9 -
1.75” DIA.
44.4mm DIA.
Figure 4 -Gas TransmitterDimensions, with Auto-Test

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -10 -
SENSORLOCATION
Combustiblegassensors areused to detectavarietyofgasesorvapors.The propersensor
location will dependonthetypeofgasisexpected. Forgasesthat arelighterthan air,suchasmethane,
sensors shouldbe locatedneartheceiling. Forgasesthat areheavierthanair,suchasbutane, sensors
shouldbe mounted nearthe floor.Ifthe gasorvaporhasadensitynearthat ofair,locate thesensor
about5feet offthe floorinenclosedareas.Gassensors mounted outdoors shouldbe located near
anticipatedleaksources(valves,flanges,compressors,etc.)and thelocation willdependonnormalwind
patternsand anticipated employee activityareas.
The followingareafew common combustiblegases,alongwiththeirrelativedensity(air=1.00).
Densitiesless thanoneindicate gasesthat arelighterthan airwhilethosewithdensitiesgreaterthan one
areheavierthanair.Combustiblevapors frommostsolvents,suchanBenzene, n-Hexane,Methanol,
Ethanol,and MEK,areheavierthanairandwilltend to accumulate nearthe floorinenclosed spaceswith
littleairmovement.
Methane0.55
Butane2.11
Propane1.55
Hydrogen0.07
Ammonia0.60
INTERFERENCES
Combustiblegassensors containtwoheatedelements.One oftheseelementsisactive, and will
allowcombustiblegasesorvapors to burnon itscatalyticsurface. The otheris passive, and doesnot
reactto gases.Thesetwo elementsformtwolegsofaWheatstone bridge measuringcircuit. When
combustiblegascontactsthe sensor,the activeelement burnsthisgasand the temperatureofthis
element increases,changingitsresistance.The transmittermeasurestheimbalanceinthe bridgecircuit
and transmitsthe data to the receiverfordisplayand alarming purposes.
Combustiblesensors areadverselyaffected byafewcompoundsthat maybe present inagiven
application.Probablythe worstofthesearesiliconevapors fromsilicon basedlubricantsorsealants.
High siliconvaporconcentrationscan causecomplete loss ofsensitivityinaslittleasafewhours.These
sensors shouldnotbeusedwheresiliconvapors arenormallypresent,and sensors shouldbe protected
fromthese vapors ifsuch compoundsare in usetemporarily.
Leadcompoundsand highlevelsofhydrogen sulfidecan alsocausedegradation ofcombustible
sensors.Whilelead vaporsarenot commonlyencountered, theycanalsocausecomplete sensorfailure
ifencountered. Hydrogensulfide willcausereducedsensitivityoverthefirstfew weeksofexposure,but
thenwilllevelout.The effectofhydrogensulfidecannormallybe compensatedforbyre-calibrationafter
the first fewweeksofuse.

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -11 -
ELECTRICALCONNECTIONS – TRANSMITTER
Externalconnectionstothe A12-17transmittercan bemade using3conductorcable. Three
conductorcableusesoneconductor(GND)asthepowersupplyandoutputsignalcommon. Figures5
and 6 showpower, output,and sensorconnectionsfortransmitters with and without Auto-test.
GROUNDJUMPER (03-0067)
GND TERMINAL
LOCATED NEXTTO
RELAY BASE
EARTH GROUND (OR CONDUIT)
3CONDUCTOR CABLE
POWER POWER
GROUND TERMINAL
RELAY BASE
C10-17 COMBUSTIBLE
SENSOR
TOCOMBUSTIBLESENSOR
Figure 5 -TransmitterConnections, no Auto-Test

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -12 -
Figure 6 -TransmitterConnections with Auto-Test

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -13 -
DUALCONDULETSYSTEM
Forsomeindoorapplications,itismoreconvenient tomount the sensortowardtheceilingofthe
roomwhilekeeping thetransmitterelectronics downat aconvenient elevation formaking calibration
adjustments.ATI’sdualCondulet systemisdesignedforthispurpose, and the interconnectingwiring is
shownbelow.Aspecialremote calibrationadaptercan be usedwiththissystemto allowgastobefed
froma point nearthe transmitterasshown in Figure 9
Figure 7 -Dual ConduletConnections, Sensorw/oAuto-Test
Figure 8 -Dual ConduletConnections, Sensorwith Auto-Test

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -14 -
Figure 9 -Dual ConduletTypical Installation

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -15 -
A12-17 TO B14 CUSTOMERWIRING DIAGRAM
Figure 10 -B14ReceiverConnections

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -16 -
A12-17 TO GENERICINSTRUMENTWIRING DIAGRAM
Figure 11 -Generic Instrument CustomerWiring

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -17 -
OPERATION
Aftermechanicaland electricalinstallation iscomplete,the transmitterisreadyforoperation. Priorto
start-up, recheckthe wiringconnectionsto be sure powerisconnectedto the properterminals.
START-UP
When powerisfirstapplied,thetransmitterwillgo throughastart-upsequence. The LCD displaywill
indicate the following information.
trX.XIndicatestransmitterprogramversion number
17Two digitgascode numberforcombustiblegas
100 %LELFull scale range ofthe transmitter
InSt/nonEInSt -Indicatesthe sensorcontainsan Auto-Test generator.
nonE-Indicatesthe sensordoesnot contain an Auto-Test generator
Enab/disA *Enab -Indicatesthe automatic, 24HrAuto-Test function isenabled.
disA-Indicatesthe automatic, 24HrAuto-Test functionisdisabled.
XX.XH*Numberofhours until the next automatic, 24HrAuto-Test
XXXX *NumberofsuccessfulsensorAuto-Tests.
XXXX *NumberofunsuccessfulsensorAuto-Tests.
AllSegmentsDisplaytestwhich powers up all displaysegmentsand flags
•Onlydisplayedwhen the Auto-test generatorisinstalled.

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -18 -
START-UP DELAY
When the start-upsequenceiscomplete,thedisplaywillbegintoindicategasconcentrationand will
displaythemAlockflag, indicating thatastart-updelayisinprogress and that themAoutputislocked at
4.0 mA.The delayperiodis5minutes,whichprovidestimeforthe sensortostabilizenearzerobefore
the outputisreleased.After5minutes,the lockflag willdisappearandtheoutput will begintotrackthe
gasconcentration. The start-up delaycan be canceled byactivating the UPorDOWNarrowwiththe
magneticscrewdriversupplied with the unit.
FRONTPANELMAGNETICCONTROLS
The front ofthe transmittermodulecontains4magneticallyactivated controls.Asshown inFigure12,
thesecontrolsareMODE,ENTER, UP,andDOWN. Ascrewdriverwith asuitablemagnet issupplied
with eachtransmitter.Thismagnet allowsforoperation ofthe transmittercontrolswithout removing the
coverof the outerenclosure. Magneticcontrolsareused fordisplaying information about the operationof
the transmitter,and performing zeroand calibrationfunctions.Thesecontrolsalsoallowmanual
activationoftheAuto-Testfunction,andsimulating manualadjustment ofthe4-20mAoutputto4
different valuesforfull systemverification.
Figure 12 -Model A12-17Front Panel

A12-17 CombustibleGas Transmitter
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Rev-H, 7/15 -19 -
LIQUIDCRYSTALDISPLAY
The displayinthe A12 transmitterprovidesthe operatorwitharealtimeconcentration displayand a
varietyofpromptsforselecting transmitteroperating modes.Figure13 showsthedisplay,including allof
the specialindicators contained in it. Belowthe Figureisa description ofeach indicator.
E
D
C
B
A
F
G
H
I
J
K
L
Figure 13 -LiquidCrystal Display
A-DigitalConcentrationDisplay
B-Zero Indicator, activatedwhile zeroing asensormodule oradjusting the 4mAoutput value.
C -Span Indicator, activatedwhilespanning asensormodule oradjustingthe20 mAoutput value.
D-DownKeyIndicator, activated when the magneticcontrolmarked “ò”isactivated.
E-Up KeyIndicator, activated when the magneticcontrolmarked “ñ”isactivated.
F-Auto-Test Indicator,activated when the transmitterisrunningtheAuto-Test routine.
G-Fail Indicator,activatedwhen an Auto-Test failure is detected.
H -mA Indicator, activated during output simulation mode orwhen the output islocked.
I -PPBIndicator(not used forcombustible gastransmitters).
J-PPMIndicator(not used forcombustiblegastransmitters).
K-LEL Indicator, normallyactivated forcombustible gasunits.
L -%Indicator, normallyactivated forcombustible gasunits.

A12-17 CombustibleGas Transmitter
O&M Manual
Rev-H, 7/15 -20 -
MENU SEQUENCE
Operation ofthetransmitterisaccomplishedfromthe front panelusingmagneticcontrols,withthe
LCD providingvisualindicationofmenu selections.Through menu selections,theusercanreview
information about the transmitter,calibrate the transmitter,manuallyactivatethe Auto-Testfunction (if
installed), simulate4different mAoutputvalues, and reset thetransmittertonormaloperationin the event
ofan Auto-Test failure. Figure 14 providesa blockdiagramofthe programin the A12-17 transmitter.
Figure 14 -TransmitterProgramChart