ATI Technologies UniSens A12 Series User manual

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O&MManual
UniSens
2-Wire GasTransmitter
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SeriesA12 Unisens 2-WireTransmitter
O&M Manual-2 -
Rev-L,7/15
TABLEOFCONTENTS
INTRODUCTION....................................................................................................................................................3
AUTO-TESTOPTION ..............................................................................................................................4
DUCTMOUNTEDSENSORS..................................................................................................................6
SPECIFICATIONS ...................................................................................................................................................7
INSTALLATION........................................................................................................................................................8
MECHANICALMOUNTING...................................................................................................................8
DUCTMOUNTSENSORINSTALLATION ...........................................................................................10
SENSING MODULEREMOVAL............................................................................................................11
CHANGING GAS SENSORTYPE...........................................................................................................11
ELECTRICALCONNECTION.................................................................................................................................12
OPERATION ............................................................................................................................................................14
START-UP.................................................................................................................................................14
STARTUPDELAY....................................................................................................................................15
FRONTPANELMAGNETICCONTROLS.............................................................................................15
LIQUIDCRYSTALDISPLAY .................................................................................................................16
MENU SEQUENCE.................................................................................................................................................17
TRANSMITTERMODE SELECTION.....................................................................................................19
INFORMATION MODE...........................................................................................................................19
TESTMODE..............................................................................................................................................19
MANUALAUTO-TESTACTIVATION..................................................................................................19
ANALOG OUTPUTSIMULATION.........................................................................................................20
CALIBRATION.........................................................................................................................................................21
SENSING MODULEZEROADJUSTMENT...........................................................................................22
SENSING MODULE SPANADJUSTMENT...........................................................................................23
CALIBRATION OF DUCTMOUNTSENSORS.....................................................................................24
MAOUTPUTADJUSTMENT..................................................................................................................25
UNDERRANGE ENABLE/DISABLE SELECTION ..............................................................................25
AUTO-TESTENABLE/DISABLE SELECTION.....................................................................................25
ERRORMESSAGES................................................................................................................................26
FIGURES
Figure1 -UniSensTransmitterComponents............................................................................................... 5
Figure2 -UniSensTransmitterw/DuctSensorComponents...................................................................... 6
Figure3 -OverallDimensions...................................................................................................................... 8
Figure4 -Wall MountingBracket................................................................................................................. 9
Figure5 -DuctMount SensorInstallation.................................................................................................. 10
Figure6 -ElectricalConnections................................................................................................................ 12
Figure7 -Remote ElectricalConnections.................................................................................................. 13
Figure8 -UniSensFrontPanel.................................................................................................................. 15
Figure9 -LiquidCrystalDisplay................................................................................................................. 16
Figure10 -TransmitterProgram Chart...................................................................................................... 17
Figure11 -SensorCalibration AdapterAssemblies.................................................................................. 22
Figure12 -DuctMount SensorCalibration................................................................................................ 24

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-3 -
Rev-L,7/15
INTRODUCTION
UniSens isatwo-wiregastransmitterforuseinmonitoring hazardousgasesinambient air.It is
designedtomonitorgasconcentrationinareasaround storage cylinders,process piping,orgasfeed
equipment invirtuallyanytype ofindustrialplant environment.
The name UniSens signifiesthe factthat thisisaUniversalSensor System.ATIsensor
modulescan beinterchanged on the universaltransmitterto easilyreconfigureforadifferent gasor
range. Sensing modulesare availableformonitoring a varietyofgasesand rangesasshownin Table 1.
TABLE1
GAS CODE NO.STD. RANGE MIN. RANGE MAX.RANGE
GENERALGASES
Alcohol 39 0-500 PPM 0-500 PPM 0-2000 PPM
Ammonia 15 * 0-100 PPM 0-50 PPM 0-1000 PPM
Carbon Monoxide 16 * 0-100 PPM 0-50 PPM 0-1000 PPM
Ethylene Oxide 37 0-20 PPM 0-20 PPM 0-200 PPM
Formaldehyde 38 0-20 PPM 0-20 PPM 0-200 PPM
Hydrogen 18 0-4 %0-2000 PPM 0-10 %
NitricOxide 25 0-50 PPM 0-25 PPM 0-500 PPM
Oxygen 19 0-25% 0-10% 0-100%
Phosgene 20 0-2 PPM 0-2 PPM 0-200 PPM
OXIDANTGASES
Bromine 10 * 0-2 PPM 0-2 PPM 0-100 PPM
Chlorine 11 * 0-10 PPM 0-2 PPM 0-100 PPM
ChlorineDioxide 12 * 0-2 PPM 0-2 PPM 0-100 PPM
Fluorine 13 * 0-2 PPM 0-2 PPM 0-100 PPM
HydrogenPeroxide 34 0-10 PPM 0-10 PPM 2000PPM
Iodine 35* 0-10 PPM 0-2 PPM 0-100 PPM
Ozone 14 * 0-2 PPM 0-2 PPM 0-100 PPM
ACID GASES
HydrogenChloride 21 * 0-20 PPM 0-10 PPM 0-200 PPM
HydrogenCyanide 22 * 0-20 PPM 0-10 PPM 0-200 PPM
HydrogenFluoride 23 * 0-20 PPM 0-10 PPM 0-200 PPM
HydrogenSulfide 24 * 0-50 PPM 0-10 PPM 0-500 PPM
Nitrogen Dioxide 26 * 0-20 PPM 0-5 PPM 0-200 PPM
SulfurDioxide 27* 0-20 PPM 0-10 PPM 0-200 PPM
GeneralAcid Gases 36 * 0-20 PPM 0-5 PPM 0-200 PPM
HYDRIDEGASES
Arsine 28 0-1000 PPB 0-1000 PPB 0-100 PPM
Diborane 29 0-1000 PPB 0-1000 PPB 0-100 PPM
Germane 30 0-1000 PPB 0-1000 PPB 0-100 PPM
HydrogenSelenide 31 0-1000 PPB 0-1000 PPB 0-100 PPM
Phosphine 32 0-1000 PPB 0-1000 PPB 0-1000 PPM
Silane 33 0-10 PPM 0-1 PPM 0-100 PPM
*IndicatesthatAuto-Test is available forstandard rangesand lower.

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O&M Manual-4 -
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UniSens transmitters,alsodesignated SeriesA12,areloop-powereddevicescapableof
operatingfromDC powersuppliesbetween12 and30VDC. Normally,thistransmitterwillbe powered
fromthe 24 VDCsupplyfromaplant widemonitoring computer,adata logger,oran alarmsystemsthat
suppliesthe DC voltage. The output ofthe transmitterisa4-20mAsignalwhichislinearwith respectto
concentrationoverthe range ofthe sensingmodule.
Construction ofthe UniSens transmitterismodularto allowsimpleinstallation and maintenance
asshowninFigure1on thenextpage. The transmitterelectronics ishoused inan aluminumshell with
an 11 pinrelayplug onthe bottom.The outerhousingisan explosion-proofand weatherproofenclosure
with arelaybasemountedinside. The transmitterelectronics modulesimplyplugsinto the relaybase,
and allwiring connectionsaremade to that base. Figure1showsanexploded viewofacomplete
UniSens transmitterwith sensing module.
The sensing elementsused inthe UniSens areelectrochemicalsensors manufactured byATI.
Thesesensors aredesignedforuseinambientairorinventilation ductsat temperaturesof-30°to+50°
C(somesensors rated to -40°C, oxygen sensors rated to -10°C)andat relativehumiditiesbetween 20
and 98%RH. Useofthesesensors inextremelydryairorincondensing gasstreamsisnot
recommended.
Eachsensing element isincorporated intoasnap-insensing module,whichalsocontains
electronicmemorythat isread bythe transmitter.Thismemorycontainsinformationon whattypeofgas
sensoriscontainedinthe module, therangeofthatparticularmodule,and thecalibration constantsfor
the sensor.When the moduleissnappedinto atransmitter,thisdata isread into thetransmitter
electronics and informationrelatedto the moduleisdisplayedon theLCD displayon thetransmitter.
Becauseall calibrationdataisstoredinthesensingmodule, thesemodulescanbecalibrated usingany
sparetransmitterand simplysnapped intoanyothertransmitterforoperation. Thisunique feature
eliminatesthe need forfieldcalibration.
AUTO-TESTOPTION
UniSens transmitters areavailablewith an optionalfeaturethat eliminatesmuchofthe manual
responsetestingrequired fortoxicgasdetectionsystems.Thisfeatureisreferred toasAuto-Test, and
consistsofaminiatureelectrochemicalgasgeneratorclosecoupled to thesensor.The generator
producesa"puff"ofgaswhenactivatedbythetransmitter.The responseofthe sensorismonitored
duringthistestto be surethat itisstillrespondingto the particulargas,andthe output of the transmitteris
driven below3.7mAifthesensordoesnot respond.Atthe sametime, theLCDdisplayindicatesthat
therewasan Auto-Test failure.
The Auto-Testsensorcheck occursautomaticallyevery24hours sothatthesensorresponseis
verifieddaily.Inaddition, the Auto-Testcan be activated manuallyat anytimeusing thecontrolson the
front ofthe transmitter.During theAuto-Testcycle, the4-20 mAoutput isheldat4mAsothat receiving
devicesdo not alarmduring the test. Becausemostusers manuallytesttoxicgassensorresponseonce
aweek, the Auto-Test feature can payforitselfveryquicklyin reduced laborcost.

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-5 -
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Figure1-UniSensTransmitterComponents

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-6 -
Rev-L,7/15
DUCTMOUNTEDSENSORS
Aspecialsensordesignisavailableas an optionthatallowstoxicgas sensorstobe
inserted intoaductorpipe throughaspecialadapter.Thissystemisdesigned toallowgas
monitoringinenclosed spaces witheasyremovalofthe sensorforservice.The special
mountingfittingprovidesamethod forfeedingcalibration gas tothe sensorwithoutcomplete
removal fromtheduct.
Ductmountsensorsareprovided withaspecialinterface cableso thatthe transmitter
electronics maybe mounted ashort distance fromthe sensinglocation.Figure2belowshows
the componentsofthe duct insertion version oftheA12 gastransmitter.
Figure2-UniSensTransmitterw/Duct SensorComponents

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-7 -
Rev-L,7/15
SPECIFICATIONS
The followinggeneralspecificationsreferto the UniSens transmitter.Becauseeachsensing
module containsadifferentsensor, there are specificationdifferencesforeach gas.
Gas Type: Customerselected fromavailablesensorlist.
Range: Supplied withstandard range foreachgasunless otherwise specified.
Display: 4 1/2 digit LCD
Accuracy: Generally±5%ofvalue, but limited byavailable calibration gasaccuracy.
Electronic Repeatability: ±1%
Electronic Linearity: ±0.5%
ZeroDrift: Sensordependent, but generallyless than 1%offull scale permonth, non-cumulative.
SpanDrift: Application dependent,butgenerallyless than 3%permonth.
UnderRange Trip: -20%(when enabled)
Output: Loop-powered 4-20 mA, 750 ohmsmaximumat 24 VDC loop power
Power: 12-30 VDC
Enclosure: NEMA4XandExplosion-proofcast aluminum, Class 1, Div.1, GroupsB, C,&D.
Controls: Magneticlinksactivated externallythrough glass window. Non-intrusive calibration.
Operating Temperature: -30ºto+55ºC (except oxygen, whichis-10ºto +55ºC)
Sensor: Modularplug-inunitwithcalibrationdata, gastype, and range in sensormemory.
Optional Sensor: Ductinsertionsensorwith 5 foot interface cable.
SensorPressureLimits: 7-30 PSIA(0.5-2Bar)
Weight: 4 lbs. (1.8 Kg.)
Approvals: CSACertificate #LR101166 (Notvalid forduct mount sensor)
Intrinsicallysafe whenused with an approved I.S.barrier.
Explosion-proof; Class I, GroupsB, C, &D; Class II, GroupsE&F, Class III without barrier

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-8 -
Rev-L,7/15
INSTALLATION
Installationofa UniSens transmitterrequiresmechanicallymountingtheenclosure, grounding
the enclosure, and connecting DC powerto the system.
MECHANICALMOUNTING
Figure3showsthedimensionsofthetransmitterenclosureand the locationand sizeofthe
electricalconduitconnection. When used inaclassified area,andexplosion-proofsealshouldbe
installedasrequired bythe localelectricalcode. The conduitorcablegland entryinto the enclosuremust
be sealedwith DowCorning732 multipurposesealant.The sealant should be liberallyapplied to the3/4-
14 NPTthread on the entrynippleorcableglandbeforeinstallation. Ifconduitisused, itmustalsobe
sealedinternallyattheentrypoint tothehousing. Thisisrequiredto preventwatercondensationinside
the conduit fromdraining into the enclosure.
-WARNING-Failureto sealtheconduitentryorcablegland will resultinwaterentering the
enclosure causing damage orfailure to the transmitterelectronics.
Figure3-Overall Dimensions

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-9 -
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The transmitterenclosurecan be mechanicallysupportedbythe conduitifproperconduit
fasteners areused.Amountingbracket issuppliedwiththetransmitterforfastening the transmitter
enclosuretoawall ormounting plate. Figure4showsthe holecenterdimension forthat mounting
bracket. The mounting bracket attachesto the back ofthe enclosurewith 4screwssupplied with the
bracket.
Figure4-Wall Mounting Bracket

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-10 -
Rev-L,7/15
DUCTMOUNTSENSORINSTALLATION
Duct mounted sensors are designed to be insertedinto an airduct orpipe through a special
adapterfitting (part number00-0814). Thisfitting hasa 1”MNPTthread on the front foradapting to the
duct orpipe. The actualduct adapteriscustomersupplied.
Installationofthissensorrequiresthat the 00-0814 adapterbescrewed intothecustomer
suppliedadapterasshown in Figure5 below. Screwin theadaptersothat the calibration gasinletportis
oriented ina direction that gastubing can easilybe connected. Oncethe adapterisinplace, the sensor
willslide into the adaptereasily. However,itisrecommended that the sensornot be installed in the fitting
untilyouare readyto startup the transmitter. Thisisespeciallytrue during construction when dustand
dirt maybe blowing through theduct system. Fouling ofthe sensormayresult.
Figure5-Duct MountSensorInstallation

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O&M Manual-11 -
Rev-L,7/15
SENSING MODULE REMOVAL
UniSens sensormodules areeasilyinserted andremoved fromtransmitterstoallow
bench calibration andsimplifyfieldservice.Toremovethe sensormodulefromthetransmitter,
be surethatthe lockringisturned fullytothe left. Fromthe lockedposition,the lockringwill
turn1/2turn.Donotattempttoremovethesensormodulewiththe lockringinthelocked
position.
Afterunlockingthe lockring, grabtheblackportionof sensor modulebetween your
thumband forefingerandturnthe entiremoduletotheleft1/8thturn.Pull the modulestraight
downand it willdisengage fromthemoduleholder.
Toinstall asensormodule,reverse theproceduredescribedabove. Besurethatthe
lock ringisintheunlocked position priortoattempting moduleinstallation.Withthe lockringin
the lockedposition,thesensormodulewill not snap intoproperposition and thetransmitter will
indicateaseries of barsacrosstheLCD display, indicating thatthereisnosensor module
installed.
NOTE:Whenasensingmoduleisunpluggedfromanoperating transmitter, theoutputof
thetransmitterwill dropbelow3.2mA,whichindicates atroublecondition.
However, thereisa30 second timedelayon thistroubleindication.Whena
sensing moduleisremoved, theLCD displaywill begincounting downfrom30.
During thecountdown,theoutputwillbeheldit'svaluepriortounplugging the
module.Whenthedisplayreaches zero,theoutputwillfalltothetrouble
condition valuebelow3.2mA. Thisdelayallowsinspection orsubstitutionof
moduleswithout affecting receiving instruments.
CHANGING GAS SENSORTYPE
UniSens transmitters willaccept sensormodulesforallofthe gaseslistedon page 3. Notethat
each gashasa specificcode number. The transmitterstoresthe code numberforanysensormodule
removed fromit. If you plug ina sensormodule that containsa different gascode numberthantheone
removed, thetransmitterwill not load anydata. Instead, itwill wait forconfirmation fromthe operatorthat
a change in gastypeisdesired. The displaywillindicate “CXX”with the XX indicatingthecode number
ofthe new gassensorplugged into it. Forinstance, if you remove a chlorine sensor, code 11, and then
plug in anHClsensor, the displaywill indicate “C21”,whichindicatesitiswaiting forconfirmation thatyou
want to change the transmitterfunctionfromchlorine to hydrogen chloride. Activate the ENTER switch
with the magneticscrewdriverand the HClsensormodule data willload.
Note: Sensorscantakeup to12hourstostabilize(bias) whenplacedintoservice unless
thesensorwas storedinthesensorkeeper.

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O&M Manual-12 -
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ELECTRICALCONNECTION
Standardtransmitters aresupplied withthesensingmoduleconnectorfactorywired totherelay
base. The onlyconnectionsrequired forinstallation arethetwo loop connectionsand earth ground to the
enclosure.Figure6showsthe properterminalsforloop wiringandtheearthgroundconnectionpoint.
The transmittermodulecan be removed fromthe outerenclosurebygentlyrocking itbackand forth while
pulling out.
Sensing moduleholders areavailablewithup to 5feet ofcableforremoting the sensorfromthe
transmitter.When suppliedinthisconfiguration,electricalinstallationwillalsorequireconnection of
sensing moduleholders tothe relaybase. An8conductorcableconnectsthe holderto thebase, and
Figure6 providesthe wiring diagramforconnection ofthe holdertotherelaybase.
Figure6-ElectricalConnections

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O&M Manual-13 -
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Figure7-RemoteElectricalConnections

SeriesA12 Unisens 2-WireTransmitter
O&M Manual-14 -
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OPERATION
Aftermechanicalandelectricalinstallationiscomplete, the transmitterisreadyforoperation.
Priorto start-up, rechecktheloopwiring connectiontobe sureit'scorrect. Reversing the loopwiring will
not damage the transmitter, but otherdevicesin the loop maybe adverselyaffected.
START-UP
When powerisfirstapplied,the transmitterwillgo through a start-up sequence. The LCD display
willindicate the following information.
LoadIndicatesthat sensormodule data isloading into the transmitter
tr1.0Indicatestransmitterprogramversion number
Sr1.0Indicatessensing modulerevisionlevel
XXTwo digitgascode number(see table1)
XXXXPPMNumberindicating the fullscale range ofthe sensing module
UrE/ Urd UrE– Indicatesthat the signaltrouble onunderrange functionisenabled
Urd – Indicatesthat the signaltroubleon underrangefunction isdisabled
InSt/nonEInSt -Indicatesthat Auto-Test function isinstalledin sensormodule
nonE-Indicatesthatsensormoduledoesnot containan Auto-Test
generator
Enab/disA Enab -IndicatesthattheAuto-Test function isenabled.
disA-Indicatesthat the Auto-Testfunction isdisabled.
XX.XHNumberofhours untilthe next scheduled Auto-Test (in hours)
XXXX Numberofsuccessfulsensortestsusing the Auto-Test generator
XXXX Numberofunsuccessfulsensortestsusing the Auto-Test generator
AllSegmentsDisplaytestwhich powers up all displaysegmentsand flags

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O&M Manual-15 -
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STARTUP DELAY
When the start-up sequenceiscomplete, the displaywillbegintoindicate gasconcentrationand
willdisplaythemAlockflag, indicatingthatastart-up delayisinprogress andthat themAoutput is
locked at 4.0 mA(except foroxygen transmitters,wherethe loop will belocked at 17.4 mA,the equivalent
of20%O2).The delayperiod is5minutes,whichprovidestimeforthe sensorto stabilizenearzero
beforethe output isreleased. After5minutes,the lock flag will disappearandthe output will beginto
trackthe gasconcentration.
NOTE: Fornewinstallationswherethe sensorhasbeen unpoweredforan extendedperiod,the 5
minute start-up delaymaynot be sufficient forthe sensorto completelyzero. Somesensors can
take up to 30 minutesto completelystabilizewhen unpowered foran extended period oftime.
FRONTPANELMAGNETICCONTROLS
The front ofthe transmittermodulecontains4magneticallyactivatedcontrols.Asshown in
Figure7, thesecontrolsareMODE,ENTER, UP,andDOWN. Ascrewdriverwithasuitablemagnet is
supplied with eachtransmitter.Thismagnet allowsforoperation ofthe transmittercontrolswithout
removing the coverofthe outerenclosure. Magneticcontrolsareused fordisplaying information about
the operationofthetransmitter,andperforming zeroand calibrationfunctions.Thesecontrolsalsoallow
manualactivation ofthe Auto-Testfunction ifinstalled, andsimulatingthe 4-20 mAoutput at 4different
valuesforfull loopverification.
Figure8-UniSensFront Panel

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O&M Manual-16 -
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LIQUIDCRYSTALDISPLAY
The displayinthe A12 transmitterprovidesthe operatorwitha realtime concentration display
and a varietyofpromptsforselecting transmitteroperatingmodes. Figure8 showsthe display,including
allofthe specialindicators containedinit.Belowthat Figureisa description ofeach ofthe indicators.
Figure9-LiquidCrystalDisplay
A-DigitalConcentration Display
B-Zero Indicator, activatedwhile zeroing asensormodule oradjusting the 4mAoutput value.
C -Span Indicator, activatedwhilespanning asensormodule oradjustingthe20 mAoutput value.
D -DownKeyIndicator,activated when the magneticcontrolmarked "∇"isactivated.
E-Up KeyIndicator, activated when the magneticcontrolmarked "∆"isactivated.
F-Auto-Test Indicator,activated when the transmitterisrunningtheAuto-Test routine.
G-Fail Indicator,activatedwhen an Auto-Test failure occurs.
H -mAIndicator,activated during output simulation mode orwhen the output islocked.
I -PPBIndicator, activatedwhen a sensormodulewitha Part-Per-Billion rangeisinstalled
J-PPMIndicator,activatedwhena sensormodulewith a Part-Per-Million range is installed
K-LEL Indicator, activated whena sensormodulewith a Percent LowerExplosive Limit range isinstalled
L -%Indicator, activated when a sensormodulewith aPercent(or%LEL)range is installed

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MENU SEQUENCE
Operation ofthe transmitterisaccomplished fromthe front panelusingmagnetic controls,with
the LCD providing visualindicationofmenu selections.Through menu selections,the usercan review
information about the transmitter,calibrate the transmitter,manuallyactivatethe Auto-Testfunction (if
installed), simulate4different mAoutputvalues, and reset thetransmittertonormaloperationin the event
ofan Auto-Test failure. Figure 9 providesa blockdiagramofthe programin theUniSens transmitter.
Figure10-TransmitterProgramChart

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TRANSMITTERMODE SELECTION
The transmitterprovides4mainmode selections.Afterthe displayscrollsthrough the power-up
sequenceand completesthe start-up delay,itentersthe NORMALmode ofoperation, displaying gas
concentration.Byholding amagnet overthe MODEcontrol,the displaywillindicate "InFo".Repeating
thisprocess willchange thedisplayto "tESt"and then "CAL". The meaning ofthese modesisasfollows:
InFoDesignatesINFORMATIONmode. In thismode, youmayreviewtheinformation initially
displayedduring the power-on sequence.
tEStDesignatesTESTmode. In thismode, theAuto-Testgeneratormaybemanually
activated, and the 4-20 mAoutput maybe tested at 4 set values.
CALDesignatesCALIBRATIONmode. In thismode, the zeroand span ofthe sensing
modulemaybeadjusted, the 4and 20 mAoutput current can be adjusted, andthe Auto-
Test generatorcan beenabled ordisabled.
INFORMATIONMODE
Toreviewthe transmitterinformation, activatethe MODEcontroluntilthe displayshows"InFo"
andthenactivatetheENTERcontrol.The displaywillscroll throughthesameinformation shownduring
power-up. See page 10 fordetailson the information displays.
TESTMODE
Therearetwoselectionsavailableunderthe TESTmenu. The firstselectionallowsmanual
activation oftheAuto-Testbythe operator.The second selectionallowsthe transmitteroutput tobe set
to 4, 12, and20 mAinorderto checkthe devicestied tothe output. In addition, afailureconditioncan be
simulated, causing the output to go to about3.6mA.
MANUALAUTO-TESTACTIVATION
Fromthe NORMALdisplay,activate theMODEcontroltwiceand the displaywillread"tESt".
Activate theENTERcontrol.Ifasensing modulewithAuto-Testgeneratorisinstalled, thedisplaywill
change to"SEnS"andthe AUTOTESTflag will bedisplayed nearthetop ofthedisplay.Ifyouactivate
the ENTERcontrolat thispoint, the Auto-TESTsequencewill beginand theAUTOTESTflag willbegin
to flash.ActivatingtheMODEcontrolwillallowyouto escapefrom thisroutinewithout activatingthetest
sequence.

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Whenthetestsequenceisactivated,the4-20mAoutputwill be lockedatthe value
beingtransmitted beforethesequence began,normallyclose to4.0mA.Ifyou observethe
LCD, youwillsee thegasconcentration beginto increaseasgasisevolved fromthe generator.When
the displayreaches10%abovethe startvalue, aPASS message will flashonthe display,indicatingthat
the sensorpassed thetest. Atthispoint the AUTOTESTflag willstop flashing andgo tosteadyon. This
indicatesthatthe Auto-Testwassuccessfulbut that the 4-20 mAoutput isstill locked. The output will
staylocked forthe next2 minutesto allowthe sensorto recoverto zero.In addition, itwillremain partially
locked foran additional8minutesto insurecompletesensorrecoverybeforeagainactivatingtheoutput.
However,ifthe measured gasconcentrationgoesabove50%ofrange during thesecond 8minute inhibit
period, the output lockisreleased and anyreceivers connectedtothetransmitterwill indicatehighgas
levels.
ANALOG OUTPUTSIMULATION
The UniSens transmitter providesthe ability to simulate4different current output valuesin order to
verify completeloopintegrity and tocalibratereceivingdevices. The outputmay be set to valuesof 4.0,12.0,
and 20.0,and may alsobe set to the "Trouble" value below3.7mA.
Fromthe NORMALdisplay,activate theMODEcontroltwiceand the displaywillread"tESt".
Activate theENTERcontrol.Ifasensing modulewithAuto-Testgeneratorisinstalled, thedisplaywill
changeto "SEnS"and theTESTflag willbedisplayednearthetopofthedisplay.Activate the MODE
controlonceandthedisplaywillchangeto tEStandthe mAflagwillbeon. Activate theENTERcontrol
onceandthe displaywillindicate 4mA.The current output fromthe transmitterwillnowbe locked on 4
mA.UsetheUPorDOWNcontroltochangetheoutput to 12 mA,20mA,or"trbl"asdesired. When
"trbl"isdisplayed, the output willgo below3.7 mA,whichisthe output valueused to indicate "Trouble"
withthetransmitter.Theoutput current fromthe transmitterwillchangeto the valueshownonthe
display.
CAUTION:Simulation of 12or20mAoutputsmaycausereceiving devices to activatealarms
and/orcontroldevices.Neversimulatethese outputswithout inhibitingalarmreceivers
ornotifying operating personnel thata systemtestis inprogress.
To escape the output simulation mode, activate the ENTER controlonce.