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

info@howellinst.com

PorTABLE EnginE TEST SETS & TrimmErSPorTABLE EnginE TEST SETS & TrimmErS

PROBE TEMP SET

6

7

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 • info@howellinst.com

©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