RH Systems PT-12 Owner's 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 

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Introduction...........................................................................................................................................................5

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QuickStart/InitialSetup.......................................................................................................................................6

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2.1

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ConnectingaTemperatureProbe.................................................................................................................6

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StartingUpthePT12..............................................................................................................................................7

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3.1

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ObtainingaReading.......................................................................................................................................7

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3.2

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PlottingTemperature....................................................................................................................................9

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Operation.............................................................................................................................................................10

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4.1

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ConnectingTemperatureProbes.................................................................................................................10

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4.1.1

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BasicProbes.........................................................................................................................................11

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4.1.2

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SmartProbes.......................................................................................................................................12

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4.1.3

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User‐SuppliedProbes..........................................................................................................................12

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4.2

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ChannelMeasurementRate........................................................................................................................13

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4.3

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NavigatingtheUserInterface......................................................................................................................13

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4.3.1

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TemperatureGraphDisplayMode......................................................................................................14

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ScrollingtheGraph..........................................................................................................................15

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ZoomingtheGraph..........................................................................................................................16

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AxisControl......................................................................................................................................16

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GraphStatistics................................................................................................................................17

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4.3.2

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ResistanceGraph.................................................................................................................................18

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4.3.3

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AllTemperatureDisplayMode............................................................................................................18

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4.3.4

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AllResistanceDisplayMode................................................................................................................19

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4.3.5

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Numeric4xDisplayMode....................................................................................................................19

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4.3.6

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Numeric2xDisplaymode....................................................................................................................20

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4.3.7

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ComboDisplayMode...........................................................................................................................21

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4.3.8

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ProbeStatusDisplayMode..................................................................................................................22

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4.3.9

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ChangingDisplayedUnitsofMeasurement........................................................................................23

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4.3.10

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ChangingNumberFormat...................................................................................................................23

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4.4

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ConfiguringtheProbes................................................................................................................................24

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4.4.1

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Averaging.............................................................................................................................................25

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4.4.2

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CurrentMode......................................................................................................................................26

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4.4.3

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CoefficientMode.................................................................................................................................27

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Callendar‐VanDusen(CVD).............................................................................................................27

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ITS90................................................................................................................................................28

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4.4.4

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ProbeConfigurationManagement......................................................................................................32

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4.5

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FileManager................................................................................................................................................34

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4.5.1

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CopyingLogFilestoUSBDrive............................................................................................................34

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4.5.2

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DeletingLogFiles.................................................................................................................................34

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4.5.3

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SetPreferredLoggingLocation............................................................................................................35

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4.6

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SystemInfo..................................................................................................................................................36

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SerialCommunications........................................................................................................................................37

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5.1

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SerialConnections.......................................................................................................................................37

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5.1.1

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ElectricalWiringtotheRS‐232Ports...................................................................................................37

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RS232PinOut..................................................................................................................................37

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SerialConfiguration.........................................................................................................................38

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5.1.2

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USBtoSerialPort.................................................................................................................................38

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5.2

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Protocol.......................................................................................................................................................39

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5.2.1

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CommunicationSequenceandTerminationCharacters.....................................................................39

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5.2.2

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CaseSensitivity....................................................................................................................................39

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5.2.3

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NumericValues....................................................................................................................................39

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5.3

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CommandList..............................................................................................................................................40

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5.3.1

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SystemLevelCommands.....................................................................................................................40

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5.3.2

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ChannelCommands.............................................................................................................................41



Introduction

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PT12Manual 7/20/2021

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ChannelSubCommands..................................................................................................................41

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5.3.3

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ProbeCommands................................................................................................................................43

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Calibration...........................................................................................................................................................45

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Uncertainty..........................................................................................................................................................46

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Specifications.......................................................................................................................................................47

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DocumentHistory................................................................................................................................................48

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FORSUPPORT,PLEASEEMAILSUPPORT@RHS.COMORCALL(480)926‐1955WITH

TECHNICALORCALIBRATIONQUESTIONS.



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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PT12Manual 7/20/2021

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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.



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Ω PRTsor100Ω PRTs.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).



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.



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.



4.1.3 USER‐SUPPLIEDPROBES



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.



LEMOF66.1B.306

DS28EC20

Image3.1.2

Operation

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4.2 CHANNELMEASUREMENTRATE



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



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.



 

Toselectadisplaymode,tapthedesiredicon.Themenuwillhide,andthenewdisplaymodewillappear.



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

Operation

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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.



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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Operation

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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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Operation

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ZOOMINGTHEGRAPH

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Pinchin/outwithtwofingerstozoomthegraphin/out.



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.



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.



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.



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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Operation

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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.



Scrollthestatisticaldataleftorrighttodisplaymoreinformation.

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Operation

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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.



Unconnectedchannelsappearwithblankvalues.

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Operation

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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.



Unconnectedchannelsappearwithblankvalues.



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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Operation

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Toswapaprobe’sindicationfromtemperaturetoresistance,tapitsbottomrightbutton:







Thetemperatureandresistancevalueforthatprobeswapplaces.Totoggleresistancebacktotemperature,tap

thebuttonagain.



Tapthedrop‐downmenuonanyofthefourchannelstoselectadifferentchannel: 



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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RH Systems PT-12, PT12 Owner's manual

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