FLUE GAS TEMPERATURE MONITOR & CUTOUT Low Boiler Efficiency Alarm Message and ... •...

203.743.6741 • 203.798.7313www.preferred-mfg.com

Instruments & Controls

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Instruments &

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LowBoilerEfficiencyAlarmMessageandContact• Elevatedstacktemperaturewillindicatereducedboiler

efficiency• Every40ºFincreaseinfluegastemperatureresultsin

anapproximate1%decreaseinboilerefficiency

BurnerShutdownContactandMessage• Dangerouslyhightemperaturesplacetheboileratrisk

ofseriousoverheatingdamage• Provides additional protection againstmud-filled low

watercutoutfloatswitchfailures• “Three out of every four accidents are caused by

overheating,and80%oftheoverheatinglossesresultedfrom continued firingwith lowwater levels; despitethe fact that boilers,…areequippedwithup-to-datecontrols.”(fromM.P.BraggandS.R.Laskey,“LowWaterAccidents,”TheHartfordSteamBoilerInspectionandInsuranceCo.)

HighVisibilityBargraphandNumericDisplay• 4DigitNumericDisplay• 200SegmentBargraph• BargraphAlarmSetpointMarkings• HighIntensity,LongLifeLEDBacklighting

FieldAdjustableusingEnglish-LanguageMenus• Inputs:TypeJorKThermocouple• 4-20mADCOutputScaling• FahrenheitorCentigrade• BargraphScaling• AlarmModes,Setpoints,Deadbands,andTimeDelays

NEMA4FrontPanel

FlexibleCommunicationsforDataLogging• 4-20mADCTemperatureRe-transmission• RS485ModbusInterface

FLUE GAS TEMPERATURE MONITOR & CUTOUTModelJC-15D

RS485 ModbusInterface

4-20 mAdc Retransmit Output

Typical Arrangement

DescriptionThe JC-15D Flue Gas Temperature Monitor is amicroprocessor-basedindicatinginstrumentforusewithaheavydutythermocoupleassembly.FluegastemperatureiscontinuouslydisplayedusingahighlyvisiblebacklitLCDdisplay.Anintuitivebargraphdisplayandalarmmessagesprovideclearstacktemperaturestatus.Bargraphscaling,alarmsetpoints,and timedelaysareall fieldselectable.Alladjustmentscanbemadedirectlyfromthefaceplateoftheinstrumentsbyscrollingthroughuserfriendly,Englishlanguagemenus.

TheType J thermocouple assembly is constructedof asealwelded inconelsheath forcorrosionprotection,andcanbedirectlyinstalledintheboiler'sfluegasoutlet.Theunitincludesa½"maleNPTprocessconnection,castironheadwith thermal block, and½" femaleNPTelectricalconnection.

JC-15D Faceplate and Display

Thermocouple Assembly Model 104087D (20”)

104087E (12”)

203.743.6741 • 203.798.7313www.preferred-mfg.com

Instruments & Controls

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FLUE GAS TEMPERATURE MONITOR & CUTOUTModelJC-15D

Alarm SequenceBargraphandnumericdisplayscontinuouslyindicatethefluegastemperature.Ifthefluegastemperatureexceedsthewarningsetpointformorethan30seconds(adjustable),thebargraphblinks,the“warning”messageappears,andthe alarm relay energizes. If the flue gas temperaturecontinuestoincreaseandexceedstheshutdownsetpointformorethan30seconds(adjustable),thebargraphblinks,the“shutdown”messageappears,theshutdownrelayde-energizesandlatchesinto“manualreset”mode.TheburnershutsdowniftheJC-15D shutdownrelayiswiredintotheburnerinterlocks.Theshutdownrelayremainsde-energizedandthe“shutdown”messageremainsonthedisplayuntiltheoperatorpressesthe“reset”pushbutton.

Thealarmrelaycanbeusedtoactivateanexternalbellorhorn.Thealarmrelayde-energizeswhenthe“warning”and“shutdown”alarmsarebothinactive.Alternately,pressingtheJC-15D “alarmsilence”pushbutton,orenergizingthe120VACalarmsilenceinput,oraModbuscommandcande-energizethealarmrelayinordertosilenceanaudiblealarm.

Suggested SpecificationsProvidearemotereadingmicroprocessor-basedfluegastemperature alarmand indicating instrument anda fluegas temperature sensor assembly for each boiler.Theinstrumentshallprovideafluegastemperaturedisplayinengineeringunits,“inefficient”operationwarningindication,“overheat” operating condition indication and alarmcontacts.TheInstrumentshallcontinuouslyindicatefluegastemperatureonahighlyvisiblebacklitLCDdisplay.Provideanintegralorseparate4inch,0.5%resolution(minimum)bargraph display in engineering unitswith visual alarmsetpointindication.Providean“alarmsilence”and“manualreset”pushbuttonandtwo10ampererelays.Thehousingshallbepanelmountable,fullygasketedwithNEMA4frontface.Alladjustmentsshallbemadefromthefrontpaneldisplayinengineeringunits.Noexternalconfigurationtoolsshallberequired.TheInstrumentshallprovide:coldjunctioncompensationandupscalethermocouplebreakprotection.Theinstrumentshallincludealarmmessagesasfollows:Whenfluegastemperatureexceedsthe“warning”setpointformorethan30seconds(adjustable),thebargraphshallblink, and the “warning”message shall appear and an“alarm”relayenergizesandifwiredtoanalarmcircuitanalarmisactivated.Ifthefluegastemperaturecontinuestoincreaseandexceedsthe“shutdown”setpointformorethan30seconds(adjustable),thebargraphblinks,the“shutdown”messageappears,the“shutdown”relayde-energizesandlatches into the “manual reset”mode. If the “shutdown”relayiswiredintotheburnerinterlocks,theburnershutsdown.The “shutdown” relay remains de-energized andthe “shutdown”message remainon thedisplayuntil theoperatorpressestheintegral“reset”pushbutton.

ProvideaFlueGasTemperatureSensorassemblyforeachboiler.Thesensorassemblyshallinclude:iron/constantanISATypeJ thermocouple, inconelsheath,½"maleNPTprocess connection, cast iron headand a 20" insertionlength.Extensionleadwireshallbeonecontinuouslengthof20gaugesISATypeJXwithPVCinsulation.Theassemblyshallbeinstalledintheboileroutletbeforeanydamperorfaninaccordancewithmanufacturerssuggestedinstallationinstructions.TheinstrumentshallincludeaRS485Modbusnetworkinterfaceanda4-20mADCretransmitoutputtocommunicate toa futureDataAcquisitionSystem(DAS)or BuildingAutomationSystem (BAS).The Instrumentshall bemanufactured and labeled in accordancewithUL508requirements(CSAC22.2#14foruseinCanada).InspectionandlabelingshallbesupervisedbyULorotherOSHAapprovedNationallyRecognizedTestLab(NRTL).TheFlueGasTemperatureMonitoring,ControlandAlarmSystemshallbePreferredInstruments,Danbury,CT,Model JC-15D,with104087DThermocoupleAssembly.

203.743.6741 • 203.798.7313www.preferred-mfg.com

Instruments & Controls

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Instruments &

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FLUE GAS TEMPERATURE MONITOR & CUTOUTModelJC-15D

SpecificationsPanelPowerSupply:120VAC,+/-15%,50/60Hz,15VACaseSize: 8"Hx3.5"Wx7.5"DEnclosureType:NEMA4faceplateAmbientTemp.:+32°to122°FDisplays: HighContrastLCDDisplay

4"high,0.5%ResolutionBargraphBargraphRange: 0°-2000°FfieldadjustableAlarmSetpoints: Two(2)adjustablewithadjustable

timedelays

InputsInputTypes: TypeJorTypeKThermocouple,

fieldselectableAccuracy: 0.005%Resolution

0.07%AccuracyBreakProtection:Upscale

OutputsRelay: TwoSPDTRelays10Aresistive,

8FLA,½HP,120VACRetransmit: 4-20mADC,650ohmload

maximumNetwork: 1200-38400Baud;RS485Modbus,

ASCIIorRTUThermocouple

Assembly: TypeJungroundedProbeMaterial: InconelInsertionLength: 20"Connection: ½"MNPT

Ordering Information1. JC-15DInstrument2. 104087ETypeJThermocoupleAssembly12”3. 104087DTypeJThermocoupleAssembly20”4. 92088-J-B20PPShieldedtypeJthermocouplewire

(specifywirelengthinmultiplesof25feet)5. OptionalAccessories:

SDA-B6AlarmBell.85db,weather-proofSDA-VBRemoteAudible/VisualAlarm

C

JC-15D Mounting and Clearance Dimensions