Photo Courtesy of Department of Defense
BH112JD Series JETCAL®1 Engine AnalyzerThe BH112JD JETCAL® Engine Analyzer provides a superior combination of capabilities in a ruggedized, portable test set.
The BH112JD JETCAL® Engine Analyzer is designed to:
• Functionallycheckandtroubleshootthetemperaturemeasuringsysteminaircraftturbineengineswithoutrunning the engines, saving fuel and engine life.
• Accuratelymonitor,recordandprintcriticalengineparameters during engine trim.
Input Parameter FlexibilityBasicenginetestparameters-temperature,speedandpressure-canallbescaledtotheexactrequirementsoftheenginebeingtested.
• Temperaturecanbedisplayedin°Cor°F.
• Enginespeedcanbescaledin%RPM,directRPMorinfrequency(Hz).
• ExternallymeasuredpressurecanbedisplayedininHg,psi,ft-lbor%Torque.
• InternallymeasuredpressurecanbedisplayedininHgor psi.
• EngineSelectSwitchallowstheoperatortoselectthespecificcalibrationandscalefactorsappropriateforthe engine under test.
• Scalefactorscanbeeasilyenteredintomemoryforupto ten different engine types.
• Instructionalpromptsareprovidedonthetesterdisplaythroughoutthescalingprocedure.
• Scalinginformationisretainedpermanentlyinmemoryunlesschangedbytheoperator.
Howell Instruments, Inc.8945 South Freeway
Fort Worth, Texas 76140www.howellinst.com
817-336-7411Fax: 817-336-7874
PorTABLE EnginE TEST SETS & TrimmErSPorTABLE EnginE TEST SETS & TrimmErS
PROBE TEMP SET
6
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80
2
5
TEMP SELECT
ON
PROBE POWERHEATER CABLEHEATER CABLE
INTERCONNECT INTERCONNECT
POWER INLETCABLE
SPREADADAPTERCABLE
JUNCTIONBOX
ASSEMBLY
HEATERCABLE
INTERCONNECTCABLE
POWER INPUTFUSE - 20
BUSS FUSE - 20
HEATERPROBE
SPREAD
ENGINE HARNESSSTAINNER INPUTS
HOWELL INSTRUMENTS, INC.
FORT WORTH, TEXAS U.S.A.
HEATER PROBE
A
Probe Control Module
B
CE
D
F
A Interconnect - Provides connection to Trimmer Section.
B Power Input - 115 or 230 VAC, 50 to 400 Hz, Single Phase Main Power Input
C Spread Cable - Connection for Spread Cable.
D Heater Cable - Connection for power and temperature signal to Junction Box or Heater Probe.
E Junction Box - Heater probe terminal connection.
F Heater Probe (model no. and quantity determined by engine application).
Probe Control module
Howell Instruments, Inc. • 8945 South Freeway • Fort Worth, Texas 76140www.howellinst.com • 817-336-7411 • Fax: 817-336-7874 • [email protected]
©2009HowellInstruments,Inc.PET112JD
Cockpit Temperature Indicator Test Thetesterprovidesasimulatedthermocoupleoutputtocheckthecalibrationofhighimpedance(nullbalance)orlowimpedance(currentdrawing)temperatureindicators.
Thermocouple Harness TestsTheaccuracyofcurrentdrawingenginetemperatureindicatorsisdependentupontheresistanceofthethermocoupleharness.TheBH112JDcanbeusedtoaccuratelymeasuretheresistanceofanyharnessto40ohms,aswellasinsulationresistanceto200,000ohms.
Probe Control
TheProbeControlSectioncontainsthepowersupplyandcontrolsrequiredfortheoperationoftheheaterprobes,includingtheconnectorandswitchrequiredtoperformspreadtests.
Totesttheenginethermocoupleharness,aheaterprobeisplacedovereachenginethermocouple.TheBH112JDJETCAL®Analyzercontrolsthepowerappliedtotheprobestomaintainthematapreselectedtesttemperature.Sincetheprobeispreciselyfittedtotheenginethermocouple,theprobeandthermocouplearemaintainedatthesametemperature.Athermocoupleembeddedintheprobeaccuratelymeasurestheprobetemperature.IftheaircraftthermocoupletemperaturedisplayedontheJETCAL®Analyzerorcockpitindicatorisoutsidetheacceptableprobetemperaturespecifiedinthemanual,a
malfunctionisindicated.TheJETCAL®Analyzercanthenbeusedasatroubleshootingdevicetocheckcockpittemperatureindicatorcalibration,thermocoupleharnesscircuitandinsulationresistance.
Inadditiontocheckingtheenginethermocouplesystem,theJETCAL®Analyzercanbeusedtotestcontinuous-wirefiredetectionsystemsandthermalswitches.Byusingaspecialairleakdetector,maintenancepersonnelcanlocateairleaksatenginepartingsurfaces,bleedairports,andanti-iceandairconditioningducts.
1JETCAL®isaregisteredtrademarkofHowellInstruments,Inc.
7
BUILT INTEST
2
5
HOWELL INSTRUMENTS, INC.
FORT WORTH, TEXAS U.S.A.
95.5
5.12
PCNT.
°C66
PSI
9
8
7
5
6
4
3
2
1PRESSURE
AIRCRAFT INSTRUMENT
INTERNAL
LEFT
1
1
22
3
3
4
4
5
5
66
ENGINE TYPE
77
88
99
1010
RIGHT
FUNCTION SELECT
NORMREADING
STD DAYREADING
TAMB SETOR PROBE
PAMBSET
EXTERNAL
INSULATIONT/C RESISTANCE
INDICATOR CHECK
TAMB
SET
RESISTANCE TEMP ZERO
RPM INPUTINSTRUCABLE
EXTERNALPRINTER
POWER INPUTINTERCONNECT
ON
OFFSTORE
N1
NORMAL
TEMP SELECT
RPM SELECT
PRESSURE SELECT
EXTERNAL(TORQUE)
SET TO PAMB
INTERNAL EP2
SET TO ZERO
HEATERPROBETEMPSET
MASTERPOWER
TEMP/RPM
Temperature/Standard Day CalculationTheengine’sthermocoupleharnessoutputmeasuresengine temperatures.
• Temperature:Displayedinunitsof°Cor°F • Maximumrange:0to1315°Cor0to2400°F
inonedegreeincrements • Calibration:Chromel®-Alumel®2(ISAtypeK)orthe
specialcalibrationrequiredbytheTF30engineWhenusedinconjunctionwiththeProbeControlSection,theTrimModulemeasuresheaterprobetemperaturesaswellastheindividualinputsfromtheenginespreadthermocouples.
AnRTDtemperatureprobeisavailableasanaccessorytoaccuratelymeasureanddisplayambienttemperature.
• AmbienttemperaturesignalssuppliedbytheRTDdisplayedin°Cor°F
• Range:–60to100°Cor–75to212°Fin0.1degreeincrements
Shouldtheenginetestproceduresrequireenginespeedandtemperaturereadingsatstandarddayconditions,theinputfromtheambienttemperatureprobeisusedtoautomaticallyprovidethestandarddaycorrectionfactor.Ifaprobeisnotavailable,thetestercancalculatecorrectedtemperatureandspeedreadingsusinganambienttemperature,whichisenteredmanuallybytheoperator.
Typical BH112JD Connection Scheme Trim module
1 Power Input/Interconnect - Power cable connects here for independent operation of Trimmer Section. Interconnect cable is connected for use with Probe Control Section.
2 Cable to connect tester to remote printer.
3 RPM/Frequency Cable - Connects in parallel to aircraft system at tachometer generator or cockpit RPM indicator.
4 Temp/RPM Signal Cable - Capable of one temp input and three RPM inputs. Design of this cable depends upon application.
5 General Purpose Temperature Cable - Allows operator to monitor engine temperature, check cockpit indicator, measure thermocouple harness loop and insulation resistance.
6 Temperature Adapter for specific application.
7 Ambient Temperature Probe Assembly.
8 External Pressure Transducer Assembly.
9 Pressure Hose for Internal Pressure Transducer.
Speed/Frequency Measurement
Thespeed/frequencymeasurementsystemisdesignedtodisplayenginespeedwhensuppliedwithinputsignalsfromstandardaircrafttachometergeneratorsorfrommonopolepickups.TheRPMSelectSwitchallowsanyoneofthreespeedinputstobeselected:
• %RPM • RPM • HzThespeed/frequencycircuitsaredesignedtoconditionthreedifferentfrequencyinputs(30,000Hzmaximum).Eachfrequencychannelcanbescaleddifferentlyandcanhave different engineering units.
Data Printout
TheBH112JDisdesignedtostoredataforprintoutbyaninternal(optional)orremoteprinter.Theengineserialnumber(orotherI.D.number),dateandtrimtargetcanbeenteredinmemorypriortotestingsothatprinteddatacanbeeasilyidentified.
TheBH112JDprovidesanRS-232orcurrentloop outputwithabaudratewhichisadjustablefrom 300to3600BITS/SEC.
Calibration
Thetestersoftwarehandlesallcalibrationautomatically,improvingsystemreliabilityandeliminatingpotentiometer-typecalibrationadjustments.
Pressure/EPR System
Thetestsetincludesapressuretransducercapableofmeasuringambientpressureorengineexhaustpressure(100inHgAmaximum).Therangeoftheinternalpressuretransduceris0to50psia(0to100.00inHg)inincrementsof0.05.
External(optional)pressuretransducerscanbesuppliedtomeasureparameterssuchasenginetorque,burnerpressureorambientpressure.
WhencalculatingEnginePressureRatio(EPR),theengineexhaustpressureismeasuredontheinternaltransducer.Theambientpressureiseithermeasuredonanexternaltransducerormanuallyenteredwhenanexternalmeasurementisnotavailable.
Environmental
TheBH112JDisaruggedizedunitcapableofoperatinginsevereenvironmentalconditions(–40to+70°Cambienttemperature)encounteredontheflightline.
Built-In Test
TheTrimModulecontainsacomprehensivebuilt-in-test feature.Whenthetesterdetectsafault,thedisplayindicateswhichcircuithasfailed.
BH112JD SeriesJETCAL® Engine Analyzer
2Chromel®andAlumel®areregisteredtrademarksofHoskinsManufacturing,Co.
PorTABLE EnginE TEST SETS & TrimmErSPorTABLE EnginE TEST SETS & TrimmErS
