Extech Instruments SDL720 User manual

UserManual


HeavyDuty
DifferentialPressureManometer
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ModelSDL720
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AdditionalUserManualTranslationsavailableatwww.extech.com
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2SDL720-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/cm2,mmHg,inchHg,metersofH2O,inchesofH2O,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compartment,tiltstand,andtripodmountarelocatedontherearoftheinstrument.
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3SDL720-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H2OInH2O
hPAhPA
kPA_PA
BarbAr
Kg/cm2_gC2
mmHg‐‐Hg
MetersH2O‐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.
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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.
5. TheavailableSetupparametersarelistedbelow.Additionaldetailedinformationis
providedbelowthislist: 
dAtE Settheclock(Year/Month/Date;Hours/Minutes/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:20.00)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second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.
4.
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).
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 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.
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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.
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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).
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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).
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Spreadsheetdataexample
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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.
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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.
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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.
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OtherBatterySafetyReminders
oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.
oNevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.

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