Omega Engineering 873C User manual

r\:OMEGA
^^^^HFiyniiyFFDii\iGiiur
EIMGIIMEERIIMCIIMC.
In0>lf."f»t lirwupCompany
MODEL873
HandHeldDigital
Thermometer
Operator'sManual

WARRANTY
OI\^EGAwarrantsthisunittobefreeofdefectsinmaterialsandworkmanship
and to givesatisfactoryservicefor a periodof one(1) year from dateofpurchase.
Iftheunitsfiouldmalfunction,itmustbereturnedtottiefactoryforevaluation.
OurCustomerServiceDepartmentwillissue an AuthorizedReturn(AR)number
immediatelyuponphoneorwrittenrequest.UponexaminationbyOMEGA,it
theunitisfound tobedefectiveitwillberepairedorreplacedatnocharge.
However,thisWARRANTYisVOIDiftheunitshowsevidenceofhavingbeen
tamperedwithorshowsevidenceofbeingdamagedasa resultofexcessive
current,heat,moisture,vibration,ormisuse,(Componentswhichwearorwhich
aredamagedbymisusearenot warranted. Theseincludecontact points, fuses,
andtriacs.
THEREARE NO WARRANTIESEXCEPTASSTATED HEREIN. THEREARENO
OTHERWARRANTIES,EXPRESSEDORIMPLIED,INCLUDINGBUTNOT
LIMITEDTOTHEIMPLIEDWARRANTIESOFMERCHANTABILITYANDOF
FITNESSFORA PARTICUUR PURPOSE.INNOEVENTSHALLOMEGA
ENGINEERING,INC.BELIABLEFORCONSEQUENTIAL,INCIDENTALOR
SPECIAL DAMAGES. THEBUYER'S SOLE REMEDY FOR ANY BREACHOFTHIS
AGREEMENTBYOMEGAENGINEERING,INC.ORANYBREACHOFANY
WARRANTYBYOMEGAENGINEERING,INC.SHALLNOTEXCEEDTHE
PURCHASE PRICEPAIDBYTHE PURCHASER TOOMEGA ENGINEERING, INC.
FORTHEUNITORUNITSOREOUIPMENTDIRECTLYAFFECTEDBYSUCH
BREACH.
ReturnRequests/Inquiries
Directallwarrantyandrepairrequests/inquiriestoOMEGACustomerService
Department,telephonenumber [phone]. Beforereturninganyinstrument,please
contacttheOMEGACustomerServiceDepartmenttoobtainanauthorizedreturn(AR)
numtier.ThedesignatedARnumber should thenbemarked on theoutsideof the return
package.
Toavoidprocessingdelays,alsopleasebesuretoInclude:
1. Returnee'sname,address,andphonenumber.
2. ModelandSerialnumbers.
3.Repairinstructions.
i^OMEGA
A..^H ENGiniEERING, IIMC
OneOmegaDrive,Box4047
Stamford, Connecticut06907-(X)47
[phone]Telex:996404Cable:OMEGA
FAX:[phone]
OMEGA'-'isa registeredtrademarkofOMEGAENGINEERING,INC.
-,Copyright1984OMEGAENGINEERING,INC.Altrightsreservedincluding
illustrations.Nothinginthismanualmaybereproducedinanymanner,eitherwholly
orinpartforanypurposewhatsoeverwithoutwrittenpermissionfrom
OMEGAENGINEERING,INC.
Printedin U.S.A. M230/025

TABLEOFCONTENTS
GENERALINFORMATION1
UnpackingandInspection1
OptionalAccessories2
PreparationforUse3
SafetySymbols and Terms4
EnvironmentalConditions4
OPERATION5
SafetyPrecautions6
SERVICINGINFORMATION9
FunctionalityCheck9
PerformanceVerification9
EnvironmentalConditions10
DisassemblyInstructions10
BatteryInstallation/Replacement12
Calibration13
ProbeMatching15
Troubleshooting...:15
SpecialHandlingofStaticSensitiveDevices18
ComponentLayout21
SchematicDiagram23

GENERALINFORMATION
TheOI^EGA®IVIodels873Cand873FareHandHeldDigitalThermo-
meters.Bothinstrumentshavelargeeasytoreadliquidcrystaldisplays
(LCD). Theinputconnectionconsistsof a subminiature,type K thermo-
couple,femaleconnector(SMP-K-F).Thisinputaccommodatesany
OMEGAtype K thermocoupleprobefittedwithanSMP-K-Mconnec-
tor.Coldjunctionelectroniccircuitry in the873F/873Cautomatically
compensatesforambienttemperaturechanges.Theseinstruments
alsoprovidepiece-wiselinearizationconformityforthermocouplenon-
linearity.Theinstrumentsarepoweredbya 9Vbattery.Continuous
operationof350hoursistypicalwithanalkalinebatteryor200hours
typicalwithacarbon-zincbattery.
TheModel873Cmeasurestemperaturefrom- 55°Cto1000°Con
tworanges.The200°Crangemeasurestemperaturefrom-55.0°Cto
199.9°Cwitha resolutionof0.1°C.The1000°Crangemeasures
temperaturefrom-55°Cto1000°Cwitha resolutionof1°C.Theac-
curacyis± (0.25%rdg -i- 1.0°C) from-40°Cto1000°Cand± (0.25%
ofrdg-l-2°C)for-40°Cto-55°C.
TheModel873Fmeasurestemperaturefrom- 60°Fto200°F on two
ranges.The200°Frangemeasurestemperaturefrom-60.0°Fto
199.9°Fwitha resolutionof0.1°F.The2000°Frangemeasures
temperaturefrom-60°Fto1999°Fwitha resolutionof1°F.Theac-
curacyoftheModel873°Fis±(0.25%ofrdg-i-2.0°F).
UNPACKINGANDINSPECTION
RemovethePackingListandverifythatallequipmenthasbeen
received. Ifthereareanyquestionsabouttheshipment,pleasecall
OMEGACustomerServiceDepartmentat(203)359-1660.
Uponreceiptofshipment,inspectthecontainerandequipmentfor
anysignsofdamage.Takeparticularnoteofanyevidenceofrough
handlingintransit.Immediatelyreportanydamagetotheshipping
agent.
NOTE
Thecarrierwillnothonoranyclaimsunlessallshipping
materialissavedfortheir examination. Afterexaminingand
removingcontents,savepackingmaterialandcartoninthe
eventreshipmentisnecessary.

OPTIONALACCESSORIES
Thefollowingoptionalaccessoriescan be usedwiththeModels873C
and873Ftoenhancetheperformanceoftheinstrument.These
accessoriesareavailable:
PartNumber
KS871
SC800
880A2
MN1604
SMP-K-M
SMP-K-F
OT-201-1
Description
TiltStand/BeltClip/ProbeHolder;can
beusedasatiltstandorclippedto
yourbelt.Itwillholdonecompact
probe.
SoftCarryingCase
DeluxeCarryingCase
9VReplacementBattery
SubminiatureThermocoupleConnec-
tor,Male
SubminiatureThermocoupleConnec-
tor,Female
1ozjarofHighThermalConductivity
Pasteforfastsurfacemeasurements.
PREPARATIONFORUSE
TheModels873Fand873Caresuppliedreadyforusewithbattery
installed. ConnecttheappropriateprobetotheminiatureTCconnec-
torlocatedonthetopoftheinstrument(justabovethedisplay).
SAFETYSYMBOLSANDTERMS
Thesymbol/!\ontheinstrumentdenotesthattheusershouldrefer
totheopjeratinginstructions.
TheWARNINGusedinthismanualexplainsdangersthatcouldresult
inpersonalinjuryordeath.
TheCAUTIONusedinthismanualexplainshazardsthatcould
damagetheinstrument.

ENVIRONMENTALCONDITIONS
OperationoftheModels873Cand873Fshouldtakeplaceat an am-
bienttemperatureof-10°Cto50°C(14°Fto122°F),lessthan80%
relativehumidityupto35°C,lineariyderate3% R.H./C from35°Cto
60°C.
OPERATION
The873Cand873FHandHeldDigitalThermometersareeasytouse
Thereisonlyonecontrol(locatedonthesideoftheinstrument)that
turnstheinstrumenton/offandselectstherange.(SeeFigures 1 and
2). Usethefollowingproceduretooperatetheinstrument:
1. Turnonthepowertotheinstrumentbyselectingthedesiredrange.
Model873C:
A.200°CrangeisthecenterpositionoftheON/OFFrangeswitch.
B.1000°CrangeistheupperpositionoftheON/OFFrangeswitch.
Model873F:
A.200°FrangeisthecenterpositionoftheON/OFFrangeswitch.
B.2000°FrangeistheupperpositionoftheON/OFFrangeswitch.
2. Selecttheappropriatetemperatureprobeandinsertitintotheinput
jack.
3.Makethemeasurement:
A.Touchtheprobetiptothematerialtobemeasured.
B.Readthedisplay.ThereadingisinCelsiusfortheModel873C.
ThereadingisinFahrenheitfortheModel873F.
NOTE
Anopensensororoverrangeconditionisindicatedby:
CAUTION
Donotattempttomeasuretemperaturesbeyond
therangeoftheprobebeingused.Probedamage
mayoccur.

WARNING
AshockhazardexistsontheModels8730and873F
Inputjackswhenprobes or sensorsareexposed to
voltagelevelsgreaterthan42Vpeaktoearthground.
SAFETYPRECAUTIONS
1. Donottouchtheprobetipwhenmeasuringexcessivelyhighorlow
temperature.
2. Donotexceed42Vpeakfromtheprobetiporinputjacktoearth
ground.
MiniatureTCConnector
LowBatteryIndicator
MinusSignDisplayed •
PlusSignImplied
3V4DigitDisplay—
On/OffRangeSwitch
OMEGA873CTHERMOMETER
LO BAT
-loao
200
TYPE K THEHMOCOUPLE
NiCr-N<AI
RANOE: -IB'C to lOOO'C
^42VMAX -^
Figure1.Model873CControlLayout
4

MiniatureTCConnector
LowBatteryIndicator^
MinusSignDisplayed-
PlusSignImplied
VADigitDisplay-
On/OffRangeSwitch
OMEGA873FTHEHMOMETER
^
rDMI
-\QO.U
^=
TYPE K THEIIMOCOUPI.E
NiCr-NiAl
RANOE. -tO'E to 2000*F
A42VMAX +
Figure2.Model873FControlLayout

SERVICINGINFORMATION
ThissectioncontainsinformationneededtomaintaintheModels
873Cand873RThefollowinginformationisincluded:functional
check,performanceverification,disassemblyinstructions,batteryin-
stallation/replacement,calibration,probematching,troubleshooting,
partslist,schematicdiagramandcomponentlayout.
WARNING
Theinformationpresentedinthissectionisin-
tendedforusebyqualifiedpersonnelonly.Turnoff
thepowerandremoveallprobesfromtheinstru-
mentbeforereplacingthebattery.
FUNCTIONALITYCHECK
Atroomtemperatureholdthetipofa probesensorbetweenyour
thumbandindexfinger.A readingbetween25°Cand40°C(77°Fand
104°F)shouldbeobservedtoconfirmfunctionalityoftheinstrument.
PERFORMANCEVERIFICATION
AccuracyCheck
1. Preparea distilledwatericebathoruseanOMEGA*TRCIIIIce
PointReferenceChamber.
2. Connecta TCprobetotheinputjackoftheinstrument.
3.ImmersetheTCprobeintotheTRCIIIordistilledwatericebath
andallow10minutesforthermalstabilization,
4. TurnontheinstrumentanduseTable 1 toverifythatthereadings
oneachrangearewithinspecifications.
Table1.PerformanceVerification
Range
200
1000
2000
873°C
0.0± 1°C
0± 1°C
873°F
32,0± 2°F
32± 2°F

ENVIRONMENTALCONDITIONS
TheModels873Cand873Fshouldbeatanambienttemperatureof
23°C±1°Canda relativehumidityoflessthan80%.
DISASSEMBLYINSTRUCTIONS
WARNING
Turnofftheinstrumentanddisconnectthe
temperatureprobebeforeremovingthebottom
cover.
NOTE
Whendisassemblingtheinstrument,handlethePC
boardbytheedges.Body oil, dirt,etccandegradecircuit
performance.KeepthePCboardcleanandfreeof con-
taminants.
1. Placetheunitfacedownona benchorothersimilarsurfaceand
removethescrewsfromthebottomcover.
2. Separatethebottomcoverfromtherestoftheinstrumentby
graspingthetopofthecase(justabovethedisplay)andcarefully
liftingitawayfromthedisplay.
3.Removethebattery.
4. Removethestandoff(ST-166-1)thatsecuresthePCboardtothe
case. ThestandoffislocatedinthecenterofthePCboard.
5.Removetheswitchcap.
6.LiftthePCboardoutofthetopcover(frontpanel)
7.Removetheshield.
8.TheLCDisheldinplaceonthePCboardbya shockresistant
mountingandisassembledasshowninFigure3.
9.Toreassembletheunit,reversetheaboveprocedure.
CAUTION
Whenremovingthe LCD fromthePCboardbecareful
nottospreadthefourretaininghooks on theclearplastic
bezelouttoofar.Theplasticbezelhooksmayfracture.