Extech Instruments HD755-NIST User manual

UserManual



HeavyDuty

DifferentialPressureManometer



ModelHD755



HD755-en-GB_V1.8 9/16

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-en-GB_V1.8 9/16

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-en-GB_V1.8 9/16

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-en-GB_V1.8 9/16

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ModewithElapsedTimer

TheRECORDfunctionrecordsasingle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.TheMin,Max,andAVGdatacannotbeexportedtothePC.

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,recordandprintreadingsfromtheHD755whileitisconnected

directlytoaPC.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-en-GB_V1.8 9/16

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-en-GB_V1.8 9/16

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.



Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriatecollection

sites,theretailstorewherethebatterieswerepurchased,orwhereverbatteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedto

takeend‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricaland

electronicequipment.



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-en-GB_V1.8 9/16

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



This manual suits for next models

Table of contents

Other Extech Instruments Measuring Instrument manuals

Extech Instruments

Extech Instruments 407768 User manual

Extech Instruments

Extech Instruments HD450 User manual

Extech Instruments

Extech Instruments 407706 User manual

Extech Instruments

Extech Instruments AN340 User manual

Extech Instruments

Extech Instruments 380801 User manual

Extech Instruments

Extech Instruments RPM250W User manual

Extech Instruments

Extech Instruments DC400 User manual

Extech Instruments

Extech Instruments Oyster Series User manual

Extech Instruments

Extech Instruments 407123 User manual

Extech Instruments

Extech Instruments HDV-WTX2 Dimensions

Extech Instruments

Extech Instruments UM200-NIST User manual

Extech Instruments

Extech Instruments 461920 User manual

Extech Instruments

Extech Instruments 407850 User manual

Extech Instruments

Extech Instruments PH220-C User manual

Extech Instruments

Extech Instruments 380360 User manual

Extech Instruments

Extech Instruments MA3110 User manual

Extech Instruments

Extech Instruments 461825 User manual

Extech Instruments

Extech Instruments AN510 User manual

Extech Instruments

Extech Instruments VB450 User manual

Extech Instruments

Extech Instruments LT510 User manual

Extech Instruments

Extech Instruments RH600 User manual

Extech Instruments

Extech Instruments CO230 User manual

Extech Instruments

Extech Instruments 461750 User manual

Extech Instruments

Extech Instruments FHT200 User manual

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual