Extech Instruments HD755 User manual

USERGUIDE



HeavyDuty

DifferentialPressureManometer



ModelHD755



HD755-EU-EN V1.7 7/13

Introduction

CongratulationsonyourpurchaseoftheExtechManometerModelHD755.Thisdevicemeasures

gaugeanddifferentialpressureintherangeof±0.500psi.TheHD755offerseleven(11)unitsof

measure(userselectablebyfrontpanelpushbutton)andhasadifferentialinputthatuses

convenientquick‐disconnectfittings.AdvancedfeaturesincludeDATAHOLD,MIN‐MAX‐AVG

RECORDmode,ZERO/OFFSET,AUTOPOWEROFF,andUSBPCinterface.Thismeterisshippedfully

testedandcalibratedand,withproperuse,willprovideyearsofreliableservice.Pleasevisitour

website(www.extech.com)tocheckforthelatestversionofthisUserGuide,ProductUpdates,and

CustomerSupport.



MeterDescription

1. P1input

2. ACadaptorjack

3. P2Input

4. LCDDisplay–Indicatesthemeasurementdata,unitofmeasure,

elapsedtimer,andfunctionsymbolsasdescribedinthismanual

5. USBPCinterfacejack(3.5mm)–Forusewithdataacquisition

software

6. UNITbutton–Presstoselecttheunitofmeasure

7. DIFbutton–Presstodisplaydifferentialpressure.Alsousedto

OFFSETthedisplayedreadings.

8. RECORDbutton–PresstoaccesstheMIN/MAX/AVGrecording

mode

9. HOLD/ZERObutton–Presstofreezethedisplayedreading.Also

usedtozerothedisplay(pressandholduntildisplayshowsallzeroes).

10. BACKLIGHT button–PresstoswitchthedisplaybacklightON.Thebacklightwill

automaticallyturnOFFafter40seconds.

11. POWERbutton–PresstoturnthemeterONorOFF

12. Batterycompartment(onrear)



HD755-EU-EN V1.7 7/13

Display

1. USBdataoutputactive

2. DifferentialPressureMode

3. DataHoldMode

4. Primarydisplay

5. RecordMode

6. MAX/MIN/AVGindicators

7. LowBatteryIndicator

8. Pressureunitofmeasure

9. ElapsedTimer

HD755-EU-EN V1.7 7/13

BasicOperation

MeterPower

TheHD755usesa9Vbatteryforpower.IfthemeterdoesnotswitchonwhenthePOWER

buttonispressedorifthedisplayshowsBAT,replacethebattery.

WhenthePOWERbuttonsispressed,themeterperformsashortself‐testandrevertstothe

settingsinplacewhenthemeterwaslastturnedoff.

AutomaticPower‐offFeature

Inordertoconservebatterylife,themeterhasanautomaticpowerofffeature(after20

minutes).Todefeatthisfeature,pressandholdtheHOLDbuttonwhileturningthemeteron.

ReleasetheHOLDbuttonwhen‘n’appearsonthedisplay.Themeterwillnowremainonuntil

theuserturnsitofforuntilthebatteryweakens.NotethattheAutoPowerOFFfeaturewillbe

reactivatedthenexttimethemeteristurnedoffandthenon.

UnitofMeasure

PresstheUNITbuttontoselecttheunitofmeasure.Thismeterofferseleven(11)unitsof

measureaslistedbelow.



UnitofMeasureDisplayicon

Poundspersquareinchpsi

InchesofMercuryinHg

Milli‐barmbar

MillimetersofMercurymmHg

Kilo‐PascalskPa

KilogramspercentimetersquaredKgcm2

InchesofwaterinH2O

FeetofwaterftH2O

CentimetersofwatercmH2O

BarsBar

Ouncespersquareinchozin2



FittingsConnection

ConnecttubingtotheP1,P2(orboth)inputport(s).Ifbothinputsareused(differentialmode),

themeterdisplaysapositivepressurereadingiftheP1pressureisgreaterthanP2anda

negativereadingifP2isgreaterthanP1.



HD755-EU-EN V1.7 7/13

ZeroAdjustandOffsetfunction

TheunitmustbekeptintheuprightpositionwhenZEROINGorwhentakingmeasurements.To

ZEROthemeter:Beforeuseandwithoutfittingsattachedtothemeter,pressandholdtheHOLD

buttonfor3secondsoruntilthedisplayshowsallzeroes.



ToOFFSETmeterreadings:PresstheDIFbuttonwhiletakingameasurement.Subsequent

readingswillrepresentthedifferencebetweenthecurrentmeasurementandthemeasurement

thatwasonthedisplaywhentheDIFbuttonwaspressed..PresstheDIFbuttonagaintoexitthe

OFFSETfunction.

MIN‐MAX‐AVGRecordModewithElapsedTimer

TheRECORDfunctiontracksthemaximum(MAX),minimum(MIN),andaverage(AVG)readings

withatimestamp.Theelapsedtimerisdisplayedonthelowerright‐handcorneroftheLCDand

informstheuserofthetimeaMAXorMINreadingwasrecorded.

1. PresstheRECORDbuttononce.TheRECindicatorwillappearonthedisplayandthe

displayedelapsedtimerwillstart(HH:MM:SSformat[hours:minutes:seconds]).

2. PresstheRECORDbuttonagaintoviewthehighest(MAX)readingrecordedsincethe

RECORDbuttonwasfirstpressed.TheMAXindicatorandmaximumreadingwillappearon

thedisplay.TheelapsedtimerwillshowthetimeoftheMAXevent.

3. PresstheRECORDbuttonagain,theMINindicatorandtheminimumvaluewillappearon

thedisplay.TheelapsedtimerwillshowthetimeoftheMINevent.

4. PresstheRECORDbuttonagain,theAVGindicatorandtheaveragevaluewillappearonthe

display.Theelapsedtimerwillcontinuetorun.

5. Toreturntonormaloperation,pressandholdtheRECORDbuttonuntilthedisplay

indicatorsREC,MAX,etc.switchoff.

NotethatintheRECORDmode,thebacklightandthepowerbuttonsaretheonlyavailable

functions.

USBPCInterface

Themeterhasabuilt‐inUSBportforusewiththeManometerDataAcquisitionsoftware.The

softwareallowstheusertoview,save,export,andprintreadingsfromtheHD755.Refertothe

documentationincludedwiththesoftwareforcompletedetails.

DisplayedErrorCodes

Thefollowingcodesaredisplayedwhenthemeterencountersanerror.

ERR1:Pressureinputexceedsspecifiedlimits

ERR2:Pressureinputistoolowtoread

ERR3:TheDifferentialPressureinputexceedsspecifiedlimits

ERR4:TheDifferentialPressureinputistoolowtoread

HD755-EU-EN V1.7 7/13

Specifications

GeneralSpecifications

DisplayFourdigitLCDwithfunctionindicators

UnitsofMeasureBAR,mBAR,psi,kg/cm2,mmHg,inchesHg,kPa,feetH2O,inches

H2O,cmH2O,andozin2

Accuracy±0.3%FS+1d(@25°C)

Repeatability±0.2%to0.5%FS

Linearity/Hysteresis±0.3%FS

CombinedAccuracy±1.1%FS

MaximumPressure2psi

Responsetime0.5stypical

InputcircuitDifferentialinputs(P1andP2)

InputPortsTwometal4.8mm,barbedfor1/8"(3.17mm)IDtubing

DataHoldFreezesdisplayedreading

SensorBuilt‐inpiezoelectricsensors

Zero/OffsetfunctionPushbuttonactivation

Samplerate0.5sec.(approx.)

CompatibilityAirornon‐corrosiveandnon‐ionizedgas(notintendedforusewith

liquids)

AutoPowerOFFMeterturnsoffafterapprox.20minutestoconserveenergy(can

bedeactivated)

PCInterfaceBuilt‐inUSBserialinterface

Storageconditions0to60oC(14to140oF);<80%RH

Operatingconditions0to50oC(32to122oF);<80%RH

Batterypower9Valkalinebattery(BATlowbatteryindicator)

Batterylife125hourstypical

Dimensions210x75x50mm(8.2x2.9x1.9”)

Weight280g(9.8oz)

HD755-EU-EN V1.7 7/13

RangeSpecifications

Range/Units(Max.)Resolution

±0.034bar0.001

±34.47mbar0.01

±0.500psi0.001

±0.035Kg/cm20.001

±25.86mmHg0.01

±1.018inchesHg0.001

±3.447kPa0.001

±1.154feetH2O0.001

±13.85inchesH2O0.01

±35.15cmH2O0.01

±8.00ozin20.01



BatteryReplacement

WhenthelowbatteryindicatorBATappearsonthedisplayorifthemeterdoesnotswitchon

whenthePOWERbuttonispressed,itisnecessarytoreplacethebattery.

Toreplacethebattery:

1. Openthebatterycompartmentbyslidingthemeter’srearpanelinthedirectionofthe

embossedarrow.

2. Replacethe9Valkalinebattery

3. Replacethebatterycompartmentcover.



AllEUusersarelegallyboundbytheBatteryOrdinancetoreturnallusedbatteriesto

communitycollectionpointsorwhereverbatteries/accumulatorsaresold.

Disposalinhouseholdtrashorrefuseisprohibited.

Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceatthe

endofitslifecycle



OtherBatterySafetyReminders

Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

Nevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.



Warning: Pressure inputs of 10 psi or higher will damage the instrument. Do not

apply pressure higher than the maximum pressure listed in the specification table

HD755-EU-EN V1.7 7/13

Conversions

UsefulconversionFactors

FromToMultiplier

inofH2OinofHg0.07355

inofH2OcmofH2O2.54

mmofHginofH2O0.03937



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com



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