Extech Instruments SDL720 User manual

Brand: Extech Instruments

Model: SDL720

Category: Measuring, testing & control

Type: User manual

UserManual



HeavyDuty

DifferentialPressureManometer



ModelSDL720



AdditionalUserManualTranslationsavailableatwww.extech.com

2 SDL720-en-GB_V1.0 12/16

Introduction

CongratulationsonyourpurchaseoftheExtechSDL720PressureManometer.Thisdevice

measuresgaugeanddifferentialpressureintherangeof±29psi.Supportedmeasurementunits

arebar,psi,Kg/cm

,mmHg,inchHg,metersofH

O,inchesofH

O,atmosphere,hPA,andkPA.

LoggeddatareadingsarestoredonanSDcardfortransfertoaPC.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

Manual,other

Translationsofthismanual,andCustomerSupport.



Safety

InternationalSafetySymbols

Thissymbol,adjacenttoanothersymbolorterminal,indicatestheusermustrefertothe

manualforfurtherinformation.



MeterDescription

1. P1Input(positive+)

2. P2Input(negative‐)

3. LCDDisplay

4. HOLDandBacklight

key

5. MAX‐MINkey

6. SETandClock

key

7. RS232outputjack

8. Resetbutton

9. PowerAdaptorjack

10. SDcardslot

11. ENTERandLOGkey

12. Downarrow▼key

(Press▼&▲keyatsametimetozerometer)

13. Uparrow▲/UNITkey

(Press▼&▲keyatsametime

tozerometer)

14. PowerON‐OFF

key

Notes:Items7,8,and9arelocatedbehindthesnap‐offcompartmentcoveronmeter’srightside.

Batterycompa rtmen t,tiltstand,andtripodmount arelocatedontherearoftheinstrument.

3 SDL720-en-GB_V1.0 12/16

GettingStarted

PowerON‐OFF

 Powerthemeterbypressingandholdingthepowerbutton foratleast1.5seconds.

 Pressandholdthepowerbuttonforatleast1.5secondstopowerOFFthemeter.

 Thismeterispoweredbysix(6)1.5VDC‘AA’batteriesorbyoptionalACadaptor.Ifthe

meterwillnotswitchONpleasecheckthatfreshbatteries

areinstalledintherearbattery

compartmentor,inthecaseoftheACadaptor,checkthattheadaptorisconnected

correctlytothemeterandtoanACsource.

DisplayBacklight

ToturnthedisplaybacklightONorOFF,pressandholdthebacklight buttonforatleast1.5

seconds.ThemeterwillbeepwhenswitchingthebacklightONorOFFunlessthebeeperis

disabled.

UnitsofMeasure

Thecurrentlyselectedunitofmeasureisshownbelowthemeasurementvalueonthemeter’s

LCD.Tochangetheunitofmeasure,pressandholdtheUNITbuttonuntilthedesiredunitof

measureappearsandthenreleasetheUNITbutton.Themeterbeginsscrollingthroughthe 

availableunitsofmeasure

(seetablebelow)aftertheUNITbuttonhasbeendepressedforat

least1.5seconds.



UNIT DISPLAYINDICATOR

psi PSI

InchHg InHg

InchH

O InH2O

hPA hPA

kPA _PA

Bar bAr

Kg/cm

 _gC2

mmHg‐‐Hg

MetersH

O‐tH2O

Atmospheres AtP

ZEROAdjustment

Tonull,orzero,thedisplayforaconnectedsensor,pressandholdtheupanddownarrow

keys foratleast1.5seconds.ThemeterwillshowCAL0onthebottomleftofthescreen.

DataHold

TofreezeadisplayedreadingontheLCD,momentarilypresstheHOLDbutton(theHOLDicon

willappearabovethereading).ToexitHOLD,presstheHOLDbuttonagain.

4 SDL720-en-GB_V1.0 12/16

SetupMode

Basicsettingsataglance

Toviewthecurrentconfigurationofthemeterwithregardtotime,date,anddatalogging

samplingratepresstheSETbuttonmomentarily.Themeterwillnowdisplaytheconfigurationin

quicksuccession.Iftheinformationismissedonthefirsttry,simplypresstheSETbuttonagain

untilalloftheinformationisnoted.

AccessingtheSetupmode

1. PressandholdtheSETbuttonforatleast1.5secondstoaccesstheSetupmenu.

2. PresstheSETbuttonmomentarilytostepthroughtheavailableparameters.Theparameter

typeisshownonthebottomoftheLCDandthecurrentselectionforthattypeisshown

aboveit.

3. Whenaparameterisdisplayedthatistobechanged,usethearrowkeystochangethe

setting.PresstheENTERbuttontoconfirmachange.

4. PressandholdtheSETbuttonforatleast1.5secondstoexittheSetupmode.Notethatthe

meterautomaticallyswitches

outoftheSetupmodeifnokeyispressedwithin7seconds.

TheavailableSetupparametersarelistedbelow.Additionaldetailedinformationis

providedbelowthislist:



dAtE

Settheclock(Year/Month/Date ;Hours/M inutes/Seconds)

SP‐t

Setthedataloggersamplingrate (Hours/Minutes/Seconds)

PoFF

Automaticpower‐offmanagement(Enableordisabletheauto‐poweroff

function)

bEEP

SetthebeepersoundON/OFF

dEC

Setthenumericalformat;USA(decimal:20.0 0)orEuropean(comma:20,00)

SdF

FormattheSDmemory card

SettingtheClockTime

1. AccessthedAtEparameter.

2. Usethearrowkeystochangeavalue

3. UsetheENTERbuttontostepthroughtheselections

4. PressandholdtheSETbuttonforatleast1.5secondstoexittothenormaloperationmode

(orsimplywait7secondsforthemeter

toautomaticallyswitchtothenormaloperating

mode).

5. Theclockwillkeepaccuratetimeevenwhenthemeterisswitchedoff.However,ifthe

batteryexpirestheclockwillhavetoberesetafterfreshbatteriesareinstalled.



SettingtheDataloggerSamplingTime(Rate)

1. AccesstheSP‐tparameter.

2. Thesamplingratecanbesetfrom‘0’seconds(manuallogmode)upto8hours,59minutes,

and59seconds.

(Datalosemayoccurwhenloggingata1se co ndrate)



3. UsetheENTERbuttontomovethroughtheHours,Minutes,andSecondsdigitgroups and

usethearrowkeystochangethedigitvalues.

PresstheENTERbuttontoconfirmtheentry.



5. PressandholdtheSETbuttonforatleast1.5secondstoexittothenormaloperationmode

(orsimplywait7secondsforthemetertoautomaticallyswitchtothe normaloperating

mode).

5 SDL720-en-GB_V1.0 12/16



Enabling/DisablingtheAutoPowerOFFFeature

1. AccessthePoFFparameter.

2. UsethearrowbuttonstoselectONorOFF.WiththeAutoPowerOFFfeatureenabled,the

meterwillautomaticallyswitchOFFafter10minutesofinactivity.

3. PressENTERtoconfirmsetting.

4. PressandholdtheSETbuttonforatleast1.5seconds

toexittothenormaloperationmode

(orsimplywait7secondsforthemetertoautomaticallyswitchtothe normaloperating

mode).



SettheBeeperSoundONorOFF

1. AccessthebEEPparameter.

2. UsethearrowbuttonstoselectONorOFF.

3. PressENTERtoconfirmsetting.

4. PressandholdtheSETbuttonforatleast1.5secondstoexittothenormaloperationmode

(orsimplywait7secondsforthemetertoautomaticallyswitch

tothenormaloperating

mode).

NumericalFormat(commaordecimal)

EuropeanandUSAnumericalformatsdiffer.ThemeterdefaultstoUSAmodewhereadecimal

pointisusedtoseparateunitsfromtenths,i.e.20.00;TheEuropean formatusesacomma,i.e.

20,00toseparateunitsfromtenths.Tochangethissetting:

1. AccessthedECparameter.

2. Usethe

arrowbuttonstoselectUSAorEUro.

3. PressENTERtoconfirmsetting.

4. PressandholdtheSETbuttonforatleast1.5secondstoexittothenormaloperationmode

(orsimplywait7secondsforthemetertoautomaticallyswitchtothe normaloperating

mode).

SDCardFORMATTING

1. AccesstheSdFparameter.

2. UsethearrowbuttonstoselectYEStoformatthecard(selectNOtoabort).Notethatall

dataonthecardwillbelostifformattingisattempted.

3. PressENTERtoconfirmselection.

4. PressENTERagaintore‐confirm.

5. The

meterwillautomaticallyreturntothenormaloperatingmodewhenformattingis

complete.Ifnot,pressandholdtheSETbuttonforatleast1.5secondstoexittothenormal

operationmode.

SystemReset

Ifthemeter’skeysbecomeinoperableorifthedisplayfreezestheResetbuttoncanbeusedto

resettheinstrument.

 Useapapercliporsimilaritemtomomentarilypresstheresetbuttonlocatedonthelower

rightsideoftheinstrumentunderthesnap‐offcompartmentcover.



AfterpressingtheResetbutton,switchtheinstrumentONbypressingandholdingthe

POWERkeyforatleast1.5seconds.Ifusingthepoweradaptorunplugtheadaptorandthen

plugitbackinagaintopowerthemeter.

6 SDL720-en-GB_V1.0 12/16

Max‐MinReadingRecord

Foragivenmeasurementsession,thismetercanrecordthehighest(MAX)andthelowest(MIN)

readingsforlaterrecall.

1. PresstheMAX‐MINbuttonmomentarilytoaccessthismodeofoperation(RECicon

appears).

2. ThemeterisnowrecordingtheMAXandMINreadings.

3. PresstheMAX

‐MINbuttonagaintoviewthecurrentMAXreadings(MAXiconappears).

ThereadingsonthedisplayarenowthehighestreadingsencounteredsincetheRECicon

wasswitchedon(whentheMAX‐MINbuttonwasfirstpressed).

4. PresstheMAX‐MINbuttonagaintoviewthecurrentMINreadings(MINiconappears).The

readingsonthedisplayarenowthelowestreadingsencounteredsincetheRECiconwas

switchedon(whentheMAX‐MINbuttonwasfirstpressed).

5. ToexittheMAX‐MINmode,pressandholdtheMAX‐MINbuttonforatleast1.5seconds.

Themeter

willbeep,theREC‐MAX‐MINiconswillswitchoff,theMAX‐MINmemorywill

clear,andthemeterwillreturntothenormaloperatingmode.

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(+).



Datalogging

TypesofDataRecording

 ManualDatalogging:Manuallylogupto99readingsontoanSDcardviapush‐buttonpress.

 AutomaticDatalogging:AutomaticallylogdataontoanSDmemorycardwherethenumber

ofdatapointsisvirtuallylimitedonlybythecardsize.Readingsareloggedataratespecified

bytheuser.

SDCardInformation

 InsertanSDcard(from1Gsizeupto16G)intotheSDcardslotatthebottomofthemeter.

Thecardmustbeinsertedwiththefrontofthecard(labelside)facingtowardtherearofthe

meter.

 IftheSDcardisbeingusedforthefirsttimeitisrecommendedthatthecardbeformatted

andthelogger’sclocksettoallowforaccuratedate/timestampingduringdatalogging

sessions.RefertotheSetupModesectionforSDcardformattingandtime/datesetting

instructions.

 EuropeanandUSAnumericalformatsdiffer.ThedataontheSDcardcanbeformattedfor

eitherformat.ThemeterdefaultstoUSAmodewhereadecimalpointisusedtoseparate

unitsfromtenths,i.e.20.00.TheEuropeanformatusesacomma,i.e.20,00.Tochangethis

setting,refertotheSetupModesection.

7 SDL720-en-GB_V1.0 12/16

ManualDatalogging

InthemanualmodetheuserpressestheLOGbuttontomanuallylogareadingontotheSDcard.

1. Setthesamplingrateto‘0’secondsasdescribedintheSetupModesection.

2. PressandholdtheLOGbuttonforatleast1.5secondsandtheDATALOGGERiconwill



appearontheLCD;thelowerportionofthedisplaywillshowp‐n(n=memoryposition

number1‐99).NotethatifPSIissetastheunitofmeasureitappearsasP51(wherea‘5’is

usedasan‘S’)inthesameareaofthe

LCDwherememorylocationsareshown.Thiscanbe

disorientingatfirst.

3. MomentarilypresstheLOGbuttontostoreareading.TheDATALOGGERiconwillflashand

thebeeperwillsound(ifsettoON)eachtimeadatapointisstored.

4. Usethe▲and▼buttons

toselectoneofthe99datamemorypositionsinwhichtorecord.

5. Toexitthemanualdataloggingmode,pressandholdtheLOGbuttonforatleast1.5

seconds.TheDATALOGGERiconwillswitchoff.

AutomaticDatalogging

Inautomaticdataloggingmodethemetertakesandstoresareadingatauser‐specifiedsampling

rateontoanSDmemorycard.Themeterdefaultstoasamplingrateoftwoseconds.Tochange

thesamplingrate,refertotheSetupModesection(thesamplingratecannotbe‘0’for

automaticdatalogging):

1. SelectthesamplingrateintheSetupModetoavalueotherthanzero.

2. PressandholdtheLOGbuttonforatleast1.5seconds.Themeterwillflashthe

DATALOGGERiconattheselectedsamplingrateindicatingthatreadingsarenowbeing

automaticallyrecordedtothe

SDcard.

3. Ifacardisnotinsertedorifthecardisdefective,themeterwilldisplayEMPTYandexitthe

DATALOGGERmode.Inthiscase,switchthemeterOFFandtryagainwithavalidSDcard.

4. PausethedataloggerbypressingtheLOGbuttonmomentarily.

TheDATALOGGERiconwill

stopflashingandthesampleratewilldisplayforashorttime.Toresumeloggingsimply

presstheLOGbuttonagainmomentarily.

5. ToterminatethedataloggingsessionpressandholdtheLOGbuttonforatleast1.5

seconds.

6. WhenanSDcardisusedfor

thefirsttimeafolderiscreatedonthecardandnamed

PMA01.Upto99spreadsheetdocuments(eachwith30,000readings)canbestoredinthis

folder.

7. WhendataloggingbeginsanewspreadsheetdocumentnamedPMA01001.xlsiscreatedon

theSDcardinthePMA01folder.Thedata

recordedwillbeplacedinthePMA01001.xls

documentuntil30,000readingsarereached.

8. Ifthemeasurementsessionexceeds30,000readings,anewdocumentwillbecreated

(PMA01002.xls)whereanother30,000readingscanbestored.Thismethodcontinuesfor

upto99documents,afterwhichanotherfolderiscreated(PMA02)whereanother99

spreadsheetdocumentscanbestored.Thisprocesscontinuesinthissamefashionwith

foldersPMA03throughPMA10(lastallowablefolder).

8 SDL720-en-GB_V1.0 12/16

SDDataCardtoPCDataTransfer

1. Completeadataloggingsessionasdetailedaboveintheprevioussections.Hint:Forthe

firstfewtests,simplyrecordasmallamountoftestdata.Thisistoensurethatthe

dataloggingprocessiswellunderstoodbeforecommittingtocritical,largescale

datalogging.

2. WiththemeterswitchedOFF,remove

theSDCard.

3. PlugtheSDCarddirectlyintoaPCSDcardreader.IfthePCdoesnothaveanSDcardslot,

useanSDcardadaptor(availableatmostoutletswherecomputeraccessoriesaresold).

4. PowerthePCandrunaspreadsheetsoftwareprogram.Open

thesaveddocumentsinthe

spreadsheetsoftwareprogram(seeexamplespreadsheetdatascreenbelow).



Spreadsheetdataexample



ACPowerAdaptor

Thismeterisnormallypoweredbysix(6)1.5V‘AA’batteries.Anoptional9Vpoweradaptoris

available.Whentheadaptorisused,themeterispermanentlypoweredandthepowerbutton

willbedisabled.



9 SDL720-en-GB_V1.0 12/16

HoseCouplings

Thismeterissuppliedwithapairofhosecouplings.Theyfit4.0mm(0.157”)tubing.

Seediagramonhowtoconnectthesecouplingstothehoseandthemeter.



10 SDL720-en-GB_V1.0 12/16

BatteryReplacementandDisposal

Whenthelowbatteryicon appearsontheLCD,thebatteriesmustbereplaced.Several

hoursofaccuratereadingsarestillpossibleinthiscondition;however,batteriesshouldbe

replacedassoonaspossible:

 Removethetwo(2)Phillipsscrewsfromtherearofthemeter(directlyabovethetopofthe

tiltstand).

 Removeandsafelyplacethebatterycompartmentandscrewswheretheywillnotbe

damagedorlost.

 Replacethesix(6)1.5V‘AA’batteriesobservingcorrectpolarity.

 Replacethebatterycompartmentcoverwiththetwo(2)Phillipsscrews.



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

o Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

o Nevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.





11 SDL720-en-GB_V1.0 12/16

Specifications

GeneralSpecifications

Display BacklitLCD;LCDsize:51x37mm(2x1.5”)

Statusindicators Over‐ra nge audiblebeepandlowbatterydisplayicon



MeasurementUnits m

Bar,psi,Kg/cm

,hPA,mmHg,inchHg,metersH

O,kPA,inches

O,ATP

Accuracy (Meter) ±(2%FS)atambienttempera ture23°C(±5°C)

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

InputPorts Twometal0.197”(5.0mm),barbedfor0.157"(4.0mm)IDtubing

Hosecouplings Replacementpairofhosecouplings(407915)

Sensor Built‐inpiezoelectricsensors

Datalogger SamplingRate AUTOLOGGING:From1secondupto8hour s59min59

sec.(Datalosemayoccurwhenloggingata1second rate)

 MANUALLOGGING:Setthesamplingrateto‘0’seconds.

Select1to99locati ons .

Dataerrornumber≤0.1%numberoftotalsaveddata

MemoryCa rd SDmemorycard;1Gto16GBsize

DataHold Freezethe displayedreading

MemoryReca ll RecordandRecalltheMaximumandMinimumreadings

Displayupdate rate Approx.1second

OperatingTempera tur e 0to50

C(32to122

F)

OperatingHumidit y 85%R.H.max.

AutoPowerOFFAfter10minutesofinactivity(canbedi sa b le d)

PowerSupply Six(6)1.5VDCbatter ies(optional9VACadaptor)

PowerConsumptio n Normaloperation(backlightanddataloggerOFF):approx.

7mAdc

 WithbacklightOFFanddatalogg ing ON:approx.25mAdc

 WithbacklightONadd

approx.10mAdc

Weight 265g(0.59lbs.)

Dimensio ns 190x68x45mm(7.5x2.7x1.8”)



12 SDL720-en-GB_V1.0 12/16

Range/ResolutionSpecifications



Range/Units(Max.) Resolution

±2000mbar 1

±29psi 0.01

±2.040Kg/cm

 0.001

±1500mmHg 1

±59.05inchesHg 0.02

±200kPa 0.1

±2000hPA 1

±802inchesH

O 0.5

±20.40mH

O 0.01

±1.974ATP 0.001



Conversions

UsefulconversionFactors

From To Multiplier

inofH

O inofHg 0.07355

inofH

O cmofH

O 2.54

mmofHg inofH

O 0.53524



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

ISO‐9001Certified

www.extech.com



Extech Instruments SDL720 User manual

Brand: Extech Instruments

Model: SDL720

Category: Measuring, testing & control

Type: User manual

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Extech Instruments SDL720 User manual

Extech Instruments SDL720 User manual

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