RH PT12 User manual

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PT12
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RHSystems,LLC
1225WHoustonAve.,
GilbertAZ,85233
Manual

Introduction
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PT12Manual 7/20/2021
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TABLEOFCONTENTS 
 Introduction...........................................................................................................................................................5 
 QuickStart/InitialSetup.......................................................................................................................................6 
2.1  ConnectingaTemperatureProbe.................................................................................................................6 
 StartingUpthePT12..............................................................................................................................................7 
3.1  ObtainingaReading.......................................................................................................................................7 
3.2  PlottingTemperature....................................................................................................................................9 
 Operation.............................................................................................................................................................10 
4.1  ConnectingTemperatureProbes.................................................................................................................10 
4.1.1  BasicProbes.........................................................................................................................................11 
4.1.2  SmartProbes.......................................................................................................................................12 
4.1.3  User‐SuppliedProbes..........................................................................................................................12 
4.2  ChannelMeasurementRate........................................................................................................................13 
4.3  NavigatingtheUserInterface......................................................................................................................13 
4.3.1  TemperatureGraphDisplayMode......................................................................................................14 
 ScrollingtheGraph..........................................................................................................................15 
 ZoomingtheGraph..........................................................................................................................16 
 AxisControl......................................................................................................................................16 
 GraphStatistics................................................................................................................................17 
4.3.2  ResistanceGraph.................................................................................................................................18 
4.3.3  AllTemperatureDisplayMode............................................................................................................18 
4.3.4  AllResistanceDisplayMode................................................................................................................19 
4.3.5  Numeric4xDisplayMode....................................................................................................................19 
4.3.6  Numeric2xDisplaymode....................................................................................................................20 
4.3.7  ComboDisplayMode...........................................................................................................................21 
4.3.8  ProbeStatusDisplayMode..................................................................................................................22 
4.3.9  ChangingDisplayedUnitsofMeasurement........................................................................................23 
4.3.10  ChangingNumberFormat...................................................................................................................23 
4.4  ConfiguringtheProbes................................................................................................................................24 
4.4.1  Averaging.............................................................................................................................................25 
4.4.2  CurrentMode......................................................................................................................................26 
4.4.3  CoefficientMode.................................................................................................................................27 
 Callendar‐VanDusen(CVD).............................................................................................................27 
 ITS90................................................................................................................................................28 
4.4.4  ProbeConfigurationManagement......................................................................................................32 
4.5  FileManager................................................................................................................................................34 
4.5.1  CopyingLogFilestoUSBDrive............................................................................................................34 
4.5.2  DeletingLogFiles.................................................................................................................................34 
4.5.3  SetPreferredLoggingLocation............................................................................................................35 
4.6  SystemInfo..................................................................................................................................................36 
 SerialCommunications........................................................................................................................................37 
5.1  SerialConnections.......................................................................................................................................37 
5.1.1  ElectricalWiringtotheRS‐232Ports...................................................................................................37 
 RS232PinOut..................................................................................................................................37 
 SerialConfiguration.........................................................................................................................38 
5.1.2  USBtoSerialPort.................................................................................................................................38 
5.2  Protocol.......................................................................................................................................................39 
5.2.1  CommunicationSequenceandTerminationCharacters.....................................................................39 
5.2.2  CaseSensitivity....................................................................................................................................39 
5.2.3  NumericValues....................................................................................................................................39 
5.3  CommandList..............................................................................................................................................40 
5.3.1  SystemLevelCommands.....................................................................................................................40 
5.3.2  ChannelCommands.............................................................................................................................41 

Introduction
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PT12Manual 7/20/2021
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 ChannelSubCommands..................................................................................................................41 
5.3.3  ProbeCommands................................................................................................................................43 
 Calibration...........................................................................................................................................................45 
 Uncertainty..........................................................................................................................................................46 
 Specifications.......................................................................................................................................................47 
 DocumentHistory................................................................................................................................................48 
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FORSUPPORT,PLEASEEMAIL[e-mail]ORCALL(480)926‐1955WITH
TECHNICALORCALIBRATIONQUESTIONS.
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Introduction
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PT12Manual 7/20/2021
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Introduction
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PT12Manual 7/20/2021
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INTRODUCTION
ThePT12isahighlypreciseandstableplatinumresistancethermometer(PRT)basedmulti‐channeltemperature
measurementsystem.Usingacustomdesignedhighprecisionmeasurementcircuitwithfullcurrentreversaland
multiplexedsampling,thePT12provides12channelsoflowuncertaintytemperaturedataforvalidationand
calibration.
Usingoneofthreeautomaticoruserselectablecurrents,thePT12repeatedlyscansall12channels.Employinga
fullreversalcurrentsource,thePT12eliminatespolaritysensitiveerrorsnormallyinherenttoDCmeasuring
techniques.Accuracyisfurtherenhancedbyreferencingallmeasurementstoaseriesofhighaccuracy,
temperaturestableinternalreferenceresistors.
TheintegratedfirmwareallowseachchanneltobeindividuallyprogrammedwithITS‐90orCallendar‐VanDusen
(CVD)coefficientsfordirectconversionofresistancemeasurementstotemperature.Itincorporatesafullcolor,
pinchzoomtouchscreenastheuserinterface.Althoughnotrequiredforoperation,thePT12mayalsobe
connectedtoaPCoveranRS‐232orUSBinterface.
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QuickStart/InitialSetup
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PT12Manual 7/20/2021
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QUICKSTART/INITIALSETUP
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Thequickstartisintendedtogetyouupandrunningquickly.Foradditionalinformationseesection4Operation.
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2.1 CONNECTINGATEMPERATUREPROBE
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Selectanyofthesuppliedprobesandconnectittoanydesiredchannel(theremainderofthissectionwillassume
channel5).Wheninsertingtheplug,ensurethereddotslineup.
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StartingUpthePT12
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STARTINGUPTHEPT12
PlugintheincludedACpoweradaptertoa110‐240VACoutlet.Plugtheroundconnectorofthepoweradapter
intothebackofthePT12.Asplashscreenshouldappearinabout15secondsandthemachinewillfullyboot
withinabout30seconds.
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3.1 OBTAININGAREADING
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Oncethesystemfullybootsandtheuserinterfaceispresent,probe5shouldindicateareasonabletemperature
value.Allprobecoefficients(ifasmartprobe)areautomaticallyreadfromtheprobeandappliedtochannel5.
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ThePT12hasseveraldifferentdisplaymodes.Itwillpowerupinthepreviousmodethatwasdisplayedonshut
down.Tochangedisplaymodes,swipewithafingerfromtheleft‐handsidetobringupthemenu.
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Fromthismenu,unitsmaybechanged,oranewdisplayformatmaybeselected.
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Power(12VDC,3A)USBFlashDriveUSBSerialRS‐232
Swipe

StartingUpthePT12
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Toselectadisplaymode,tapthedesiredicon.Themenuwillhide,andthenewdisplaymodewillappear.Forthis
quickstartexample,selectthetopleftdisplaymodeicon(thisisthetemperaturegraphdisplaymode).
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Formoreinformationseesection4.3NavigatingtheUserInterface.
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StartingUpthePT12
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PT12Manual 7/20/2021
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3.2 PLOTTINGTEMPERATURE
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Toaddaprobe’svaluetothegraph,taptheappropriateprobe(probe5inthiscase)onthetopportionofthe
screen.Theprobe’srecentdatawillbeplottedonthegraph.Toensurethatthedataisvisible,taptheShowAll
graphbuttons,andtheContinuousUpdatebuttontoenablethem.Whenenabled,theyarehighlightedinlight
blue.
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Dragasinglefingeronthegraphtoscrollinanydirection.Usetwofingersforpinch‐zoomoperation.Foradditional
informationongraphfunctions,seesection4.3.1TemperatureGraphDisplayMode
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Note:Thegraphonlyretainsthelast48hoursofdata,whilethelogfileholdsallthedatasincethelastpower
cycleorwhenloggingwaslasttoggledon.Seesections4.5FileManagerand4.6SystemInfo.
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Operation
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PT12Manual 7/20/2021
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OPERATION 
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ThePT12measurestemperaturebyratiometriccomparisonoftheunknownresistanceofatemperatureprobeto
aseriesoftemperaturestableprecisionreferenceresistors.
Throughcustomselectionofthefourreferenceresistors,thePT12operatingrangeandprecisioncanbetunedfor
either25ΩPRTsor100ΩPRTs.Alternatively,itcanbecustomizedtocoverbothrangeswithslightlylessoverall
precision.(Formoreinformationoncustomization,contactRHSystems).ThePT12supportsthreedistinctcurrent
modeswhichcanbemanuallyorautomaticallyselected.Thethreecurrentmodesavailableareapproximately0.3
mA,0.6mA,and1mA.ThePT12willattempttogetthemostaccuratereadingpossiblewhenutilizingautocurrent
mode.
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4.1 CONNECTINGTEMPERATUREPROBES
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Thereare12LEMOconnectors(oneperprobe)onthePT12andanynumberofprobes(between1and12)maybe
connectedinanyorderatanygiventime.Toconnectaprobe,ensurethereddotsbetweentheplugand
receptaclearealigned,thenpushtoconnect.Pullinguponthebodyoftheplugreleasesthecatch,allowingthe
probetoberemoved.Onceinserted,thePT12willautomaticallydetecttheprobeanddetermineifitisasmart
probe(withinternalconfigurationmemory)orabasicprobe(withoutanymemory).
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Operation
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4.1.1 BASICPROBES
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Basicprobesdonothaveinternalmemoryandusethechannel’sconfigurationforcoefficients.Ifyoumoveabasic
probefromonechanneltoanother,youwillhavetomanuallyreentertheprobecoefficients.Pins1and6are
jumperedtogetherinsidetheLEMOplugtoindicateabasicprobe.
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Jumper
Wire
Image3.1.1
LEMOF66.1B.306
Basic
Probe

Operation
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4.1.2 SMARTPROBES
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TheLEMOconnectorofeachsmartprobeisembeddedwithaMaximIntegratedDS28EC20‐20Kb1‐WireEEPROM
chip.Thismemorychipholdstheprobe’scoefficients,serialnumber,andcalibrationdate.Whenasmartprobeis
pluggedin,thePT12automaticallydetectsitandextractsconfigurationinformationfromthechip.Manualentryof
coefficientsisnotrequiredastheconfigurationinformationtravelswiththeproberegardlessofwhichchannelit’s
pluggedinto.
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4.1.3 USER‐SUPPLIEDPROBES
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UsersuppliedprobesmaybeutilizedbywiringthemtoaLEMOconnector(part#FGG.1B.306).Tocreateabasic
probe,shortpin1topin6.Tocreateasmartprobe,insertaMaximIntegratedDS28EC20withpin1ofthechipto
pin1oftheLEMOandpin2ofthechiptopin6oftheLEMO.Pin3ofthechipisunusedandshouldbecutoff.See
Image3.1.2above.Bothsmartandbasicprobeswillrequireaninitialentryofcoefficients.Uponsaving,thesmart
probecoefficientswilltravelwiththeprobe.BasicprobecoefficientswillberetainedinthePT12channel.
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LEMOF66.1B.306
DS28EC20
Image3.1.2

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4.2 CHANNELMEASUREMENTRATE
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Ittakesapproximately90msecperreadingforeachoftheattachedprobesandeachofthefourinternalreference
resistors.Meaning,iftwelveprobesareattached,thetotalmeasurementtimetoupdatealltwelvechannelsand
thefourreferenceresistorsisjustunder1.5seconds.Iffewerprobesarepluggedin,unusedchannelsare
automaticallyskipped,increasingmeasurementfrequency.Forexample,withonlyoneattachedprobe,the
approximateupdateratewouldbelessthan0.5seconds.
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4.3 NAVIGATINGTHEUSERINTERFACE
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ThePT12hasatouchscreeninterfacethatsupportstap,pinch/zoom,swipe,andlongpress.Theyeachhave
differentfunctionsandaresupportedonvariousdisplaymodes.
ThePT12hasseveraldifferentdisplaymodes.Itwillpowerupinthepreviousmodethatwasdisplayedonshut
down.Tochangedisplaymodesswipewithafingerfromtheleft‐handside.Thisbringsupamenuofavailable
displaymodes.
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Toselectadisplaymode,tapthedesiredicon.Themenuwillhide,andthenewdisplaymodewillappear.
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Thedisplaymodeiconsanddescriptions:
TemperatureGraph:Majorityofthescreenisfilledwithatemperaturegraphwith12small
temperaturevalueslistedabove.
ResistanceGraph:Majorityofthescreenisfilledwitharesistancegraphwith12smallresistance
valueslistedabove.
AllTemperatures:Showsa2x6gridwiththetemperaturesofalltwelveprobes.
Swipe

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AllResistances:Showsa2x6gridwiththeresistancesofalltwelveprobes.
4xNumeric:Showsa2x2gridwiththetemperaturesandresistancesofanyfourselectedprobes.
2xNumeric:Showstemperaturesandresistancesinalargefontforanytwoselectedprobes.
Combo:Showsuptotwelveconnectedprobetemperaturesononeside,aminigraph,andalarge
numericvalue(temperatureandresistance)foranysingleprobeselected.
ProbeStatus:ShowstheprobeconnectionstatusofeachchannelofthePT12.
4.3.1 TEMPERATUREGRAPHDISPLAYMODE
Toaddaprobetothegraph,taponitsnumericvalue.Thenumericvaluewillbeoutlinedinaunique
color,andthetemperatureplotwillappearonthegraphinthatsamecolor.
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NOTE:Thegraphonlyretainsthelast48hours’worthofdata,whilethelogholdsallthedatasincethelastpower
cycleorwhenloggingwaslasttoggledon.
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SCROLLINGTHEGRAPH
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Toscrollthegraph,dragafingerinanydirection.Alternatively,toscrollasingleaxis,dragwithintheaxisarea.
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ZOOMINGTHEGRAPH
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Pinchin/outwithtwofingerstozoomthegraphin/out.
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Alternatively,tozoomasingleaxis,longpressontheaxisareathendrag.Fory‐axis,dragupordowntozoominor
out.Forx‐axis,dragrightorlefttozoominorout.
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AXISCONTROL
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ShowAll(x‐axis):Whilethebuttonisselectedthex‐axiswillbescaledtoshowalldata.
ShowAll(y‐axis):Whilethebuttonisselectedthey‐axiswillbescaledtoshowalldata.
Fixedy‐axis(semi‐auto):Whilethebuttonisselectedthey‐axisisfixed.Ifthedatagoesoutofboundsthe
y‐axisautomaticallyadjuststofitthedata.
Lockedy‐axis:Whilethebuttonisselectedthey‐axisremainsexactlyasshownwithoutanyauto
adjustment.
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X‐axisWidth:Fixesthewidthofthex‐axistothespecifiedperiodoftime.
Scrollingdoesnotaffectthisvaluehowever,zoomingoverridesthisvalue.The
numericvaluedisplaysinhours,minutes,orsecondsbasedonitsassociated
drop‐downmenu.
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ContinuousUpdate:Whilethebuttonisselected,thegraphwillalwaysdisplaythemostrecentvalues,
scrollingthetimeaxisasrequired.Manuallyscrollingorzoomingwilldisablethisbutton.
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GRAPHSTATISTICS
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Todisplaynumericalstatisticsofanycurrentlygrapheddata,longpressanddragtheboxtohighlightthegraph
datayouwishtoanalyze.Afterreleasing,thestatisticswillbeshownabovethegraph.
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Scrollthestatisticaldataleftorrighttodisplaymoreinformation.
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4.3.2 RESISTANCEGRAPH
Theresistancedisplaygraphisidenticaltothetemperaturegraphofsection4.3.1TemperatureGraph
DisplayMode,withtheexceptionthatvaluesshownandgraphedareproberesistancesratherthantemperatures.
4.3.3 ALLTEMPERATUREDISPLAYMODE
TheAllTemperatureDisplayModesimultaneouslyshowsalltwelvetemperaturesinthelargestfont
possible.
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Unconnectedchannelsappearwithblankvalues.
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4.3.4 ALLRESISTANCEDISPLAYMODE
TheAllResistanceDisplayModesimultaneouslyshowsalltwelveresistancesinthelargestfontpossible.
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Unconnectedchannelsappearwithblankvalues.
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4.3.5 NUMERIC4XDISPLAYMODE
TheNumeric4xDisplayModeshowsanycombinationoffourindividuallyselectablechannels.Eachofthe
fourchannelsmaybeselectedtoshowtemperatureorresistanceinalargefontwhileshowingtheoppositeina
smallerfont.
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Toswapaprobe’sindicationfromtemperaturetoresistance,tapitsbottomrightbutton:
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Thetemperatureandresistancevalueforthatprobeswapplaces.Totoggleresistancebacktotemperature,tap
thebuttonagain.
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Tapthedrop‐downmenuonanyofthefourchannelstoselectadifferentchannel: 
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4.3.6 NUMERIC2XDISPLAYMODE
The2xNumericDisplayModeshowsanycombinationoftwoindividuallyselectablechannels.Eachofthe
twochannelsmaybeselectedtoshowtemperatureorresistanceinthelargestpossiblefont.Operationisidentical
tosection4.3.5Numeric4xDisplayMode.
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