Extech Instruments SD750 User manual

USERGUIDE
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3‐ChannelPressureDatalogger
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ModelSD750
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SD750-EU-EN V1.6 08/13
2
Introduction
CongratulationsonyourpurchaseoftheExtechSD750PressureDataloggerforusewith2‐wire
pressuretransducers(optionallyavailable).Thismeterdisplaysandstorespressuremeasurement
dataovertimestoringtheinformationonaSDcardwhosedatacanthenbedownloaded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
Guide,ProductUpdates,andCustomerSupport.

Features
MonitorPressureLevelsfromthreeseparatesources
Dataloggerdate/timestampsandstoresreadingsonanSDcardinExcel®formatforeasy
transfertoaPC
RS232serial16‐bitoutputstream
Selectabledatasamplingrate:5,10,30,60,120,300,600secondsandAUTO
Lowpowerconsumption,longbatterylife
ACpoweradaptor(included)
Forusewith2‐wirepressuretransducers(optionallyavailable)

SD750-EU-EN V1.6 08/13
3
MeterDescription

1.
LCDDisplay
2.
Channel1PressureReading
3.
Channel2PressureReading
4. Channel3PressureReadingDisplay
5.
Unitofmeasureforallchannels
6.
Protectivecompartmentdoor(side)
7. LOG(ENTER)button
8.
SETbutton
9. ▼ downarrowbutton
10.
▲ (TIME)uparrowbutton
11. Channel1transducerinput(4‐20mA)
12.
Channel2transducerinput(4‐20mA)
13. Channel3transducerinput(4‐20mA)


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Leftsideview(behindprotectivedoor)
14. ACpoweradaptorjackforsuppliedadaptor
15. Resetbutton(pressifdisplaylocks)
16.
RS‐23216‐bitdatastreamoutput
17. SDmemorycardsocket
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Note:
Thebatterycompartment,tiltstand,andwallmountaccessholes,notpictured,are
locatedontherearofthemeter.
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1
2
35
6
7
8
9
10
4
11 12 13
14
15
16
17

SD750-EU-EN V1.6 08/13
4
GettingStarted
MeterPowerNotes:
oTheinternalbatteries(6x1.5VAAA)maintaintheclocktime/dateaccuracy.
oTheACadaptorpowerstheunitforallotheroperation.
oTimeandDateiskeptaccurateevenwhentheACadaptorisdisconnectedaslongas
freshbatteriesareinstalled.
oFornormaloperation,pleaseinstallbatteriesANDconnecttheunittoanACsourcevia
theACadaptor.
oTheunitdoesnothaveapowerswitch.
BatteryWarning,InstallationandReplacement
1. Whenthe lowbatteryiconappearsinthedisplay,thebatteriesareweakandshould
bereplacedassoonaspossible.
2. Toreplaceorinstallbatteries,removethePhilipsheadscrewthatsecurestherear
batterycoverandliftoffthecover.
3. Replacethesix(6)‘AAA’batteries(usealkaline,heavydutytype),observingpolarity.
4. Replaceandsecurethe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
oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.
oNevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.

SD750-EU-EN V1.6 08/13
5
MountingandWiring
oTheSD750canbeplacedonatabletopusingthesuppliedtiltstand,itcanbewall
mountedusingtherearmountingaccessholes,oritcanbelaidflatonadesktoporother
surface.
oUptothree4‐20mADCpressuretransducers(two‐wire)canbeconnectedtothebottom
oftheSD750asshowninthediagrambelow.
oWiringfor2‐wiretransmittersmustbeconfiguredexactlyasshowninthediagram.Only
thetwoterminalsontherightforeachchannelgrouparetobeused.Thetwoterminals
ontheleftforeachchannelgroupareunused.
oSignalpositive(S+)andPowerpositive(V+)areconnectedtothesameterminalasshown
inthediagrambelow.Signalnegative(S–)andPowernegative(V‐)areconnectedtothe
sameterminalasshownbelow.
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
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CH1 CH2 CH3
V+ V-
S+ S-
V+ V-
S+ S-
V+ V-
S+ S-

SD750-EU-EN V1.6 08/13
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SetMode
Beforetakingmeasurementsanddatalogging,theSD750mustbeconfiguredtomatchthe
applicationandtransducersinquestion.TheSETmodeisusedtoaccomplishthefollowing:

oFormataSDmemorycard
oSettheclockdateandtime
oSetthesamplingtime(dataloggingcapturerate)
oSetthebeepersoundON/OFF
oSetthemetertouseadecimal(US)oracomma(EU)forreadingsstoredontheSDcard
oSettheRS232dataoutputstreamON/OFF
oSetCH1,CH2,andCH3pressuresensorparameterstomatchthetransducer(s)beingused
oSetthePressureunitofmeasure(allchannelsusethesameunitofmeasure)

Note:ThedataloggerfunctionmustbeswitchedOFFbeforeattemptingtoenterSETmode.

SETMODEMENU

ToentertheSETmode,pressandholdtheSETbuttonfor>2seconds,andthenrelease.‘SET’
willflashquicklyonthedisplayandthesymbolforthefirstMenuitemSdF(formatSDcard)
willappear.Followthestepsbelowtonavigatethemenutreeandtomakeandsavechanges
toparametersettings.

Note:IntheSETmode,ifnobuttonispressedwithin5seconds,theloggerwillexittheSET
modeandreturntothestandardmodeofoperation.
1. SdF:FormattheSDcard
Usethe▲buttontoselectyESorno.Toformat(andcompletelyerase)anSDcardselect
‘yES’andthenpressEnter.Theformattingprocesswillbegin.Toskipthisstepwithout
formattingthecard,select‘no’andthenpressSETtoadvancetothenextparameter.
2. dAtE:Setthedateandtime
Usethe▲or▼buttonstoadjusttheYear/Month/Day/Hour/Minutes/Seconds.Usethe
Enterbuttontostoreandtostepthroughtheavailablefields.Whendone,PressSETtostore
thesettingsandtoadvancetothenextparameter.
3. SP‐t:Setthesampletime(dataloggingcapturerate)
Usethe▲buttontoselectthedesiredsamplerate.Theoptionsare:5,10,30,60,120,300,
600secondsandAUTO.InAUTO,areadingwillbestoredonlywhenthereisavaluechangeof
±10digits.PressENTERtostorethesettingandtoadvance.
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SD750-EU-EN V1.6 08/13
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4. bEEP:SetthebeeperONorOFF
Usethe▲buttontoselectONorOFFandthenpressEntertostorethesettingandto
advance.
5. dEC:SettheSDcarddecimalcharacter
Usethe▲buttontoselectUSA(fordecimalpointusage)orEuro(forcommausage)and
pressENTERtostorethesettingandtoadvance.
6. rS232:SettheRS232dataoutputstreamON/OFF
Usethe▲buttontoselectONorOFFandthenpressENTERtostoretheselectionandto
advance.ForstreamingofdatatoaPCviatheRS232Outputjack,theoptional407001‐USBkit
(RS232toUSBcableanddriverCD)alongwiththe407001software(availablefreeatthe
extechwebsitewww.extech.com)arerequired.
7. tyPECH1:SetChannel1PressureSensorrange
Theselectedrangemustmatchtherangeforagiventransducer.Usethe▲buttontoselect
2,5,10,20,50,100,200,or400barandthenpressENTERtostorethesettingandto
advance.
8. tyPECH2:SetChannel2PressureSensortype(sameprocedureasforChannel1above)
9. tyPECH3:SetChannel3PressureSensortype(sameprocedureasforChannels1and2)
10. unit:Settheunitofmeasureforallchannels
Usethe▲buttontoselectaunitofmeasure.Allchannelssharethesameunitofmeasure.
TheoptionsareBAR,PSI,kg/cm2,mmHG,inHG,mH2O,inH20,ATP(atmospheres),andkPa.
11. ESC:Exitthesettingmode.PresstheSETbuttontoreturntonormaloperation.
SystemRESET
IfaconditionappearswheretheCPUdoesnotrespondtokeystrokesorthemeterdisplay
seemsfrozen,presstherecessedRESETbuttonontheleftsideofthedataloggerbehindthe
protectivedoortoreturnthemetertoaworkingstate(insertapapercliporsimilarpointed
objecttopresstheRESETbutton).
RS‐232/USBPCInterface
ForstreamingofdatatoaPCviatheRS232Outputjack,theoptional407001‐USBkit(RS232to
USBcableanddriverCD)alongwiththe407001software(availablefreeattheextechwebsite
www.extech.com)arerequired.

SD750-EU-EN V1.6 08/13
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Measurements
Whenthemeterisproperlypowered,mounted,configured,andwiredtothetransducersas
describedearlier,themetercanbegintobeusedtoaccuratelydisplaypressurereadings.
Themeter’sLCDshowstheChannel1inputreadingonthetop,theChannel2readinginthe
center,andtheChannel3readingonthebottomasshownbelow.Ifthex100indicatoris
flashingonthedisplay,multiplythedisplayedreadingbyafactorof100toobtainthecorrect
reading.
TheunitofmeasureshowntotherightoftheChannel2readingappliestoallchannels.Select
theunitofmeasureasdescribedintheSETMODEsection.



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
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Channel 1
Channel 2
Channel 3
UNITS

SD750-EU-EN V1.6 08/13
9
Datalogging
1. OpentheleftsidedoorandinsertanSDcard
SDConsiderations:
oTheSDcardshouldbeatleast1GBincapacity.4GBisthemaximumsizerecommended,
althoughacardofupto16GBcanbeaccommodated.
oDonotusememorycardsformattedbyothermetersorcameras.UsetheSDcard
formattingprocedureincludedintheSETMODEsectionofthismanual.
oIfaSDmemorycardisnotinstalled,anerrormessagewillappearinthedisplay.
Displayederrormessages:
Thememorycardisfullorthereisaproblemwiththecard
Thebatteryislowanddataloggingisdisabled
TheSDcardisnotinserted
2. ProgramthemeterasdescribedintheSETUPMODEsectionofthisguide.
3. PresstheLOGGERbuttonfor>2secondstobeginlogging.‘DATALOGGER’willappearinthe
displayandthemeterwillbeepeachtimedataisrecorded(ifbeeperisenabledinSET
mode).
4. Tostopdatalogging,presstheLOGGERbuttonfor>2seconds.‘DATALOGGER’willchange
to‘DATA’andthemeterwillcountdownthroughtherecordeddatalistreadingbyreading.

ImportantNote:NeverremovetheSDmemorycardwhilethedataloggerisrunning.

No
CArd
LobAt
CH-
CArd

SD750-EU-EN V1.6 08/13
10
SDCardDataStructure
1. WhentheSDcardisfirstinsertedintothedataloggerthefolderPSB01iscreatedonthe
card.
2. ThefirstdataloggingsessionwillthencreateafilePSB01001.xls.Alldatawillbesavedto
thisfileuntilthenumberofcolumnsreaches30,000.
3. After30,000columns,anewfile(PSB01002.xls)iscreated.Thisisrepeatedevery30,000
columnsuntilPSB01099.xls.Atthispointanewfolder,PSB02iscreatedandtheprocessis
repeated;PSB10isthefinalfolder.

TransferringDatatoaPC
1. RemovethememorycardfromthedataloggerandplugitintotheSDcardslotonthePC.
ForPCsthatdonotincludeanSDcardreader,externalSDcardreadersaregenerally
availableandcanbeconnectedtothePC’sUSBjack.
2. LaunchExcel®andopenthedatafileonthememorycardfromwithinthespreadsheet
program.Thefilewillappearsimilartotheoneshownbelow.
















QuickChecktheTime,Date,andSampleRateSettings
PressandHoldtheTIMEbuttonfor>2secondsandthedisplaywillautomaticallycyclethrough
thedate,timeandsamplerateinformation.ToeditthesesettingspleaserefertotheSETmode
sectionofthisguide.


SD750-EU-EN V1.6 08/13
11
Specifications
MeterSpecifications
Display 60x50mm(2.4x2.0”)LCD
MeasurementsPressurefromupto3two‐wirepressuretransducers
InputsignalsLinear4‐20mADCprocesssignal
Accuracy±(0.5%+2digits)ofreading(meteronly,doesnotinclude
transducererror)
MemoryCardSDmemorycard,1GBto16GB(4GBmaximumrecommended)
DataloggerSamplingRate5/10/30/60/120/300/600secondsorAutomatic
Dataloggererrors0.1%maximumfortotalsaveddata(typical)
Temp.CompensationAutomatic
DisplayupdaterateApprox.1second
DataOutputRS232SerialInterface;16‐bitdatastreamvia3.5mmjack
OperatingTemperature0to50°C(32to122°F)
OperatingHumidityLessthan85%RH
PowerSuppliesSix(6)‘AAA’Alkaline,heavyduty1.5Vbatteriesand
9VACadaptor.Bothmethodsmustbeusedforproperoperation.
Batteriesmaintaintimeanddate(evenwhentheACadaptoris
disconnected)
ACadaptorpowerallotherfunctions
Weight199g(0.44lbs.) 
Dimensions132x80x32mm(5.2x3.1x1.3”)
OptionalAccessories2‐wiretransducers,RS232serialcable,RS232USBadaptor

SD750-EU-EN V1.6 08/13
12
OptionalTransducerSpecifications
SensortypePT30‐SDPT150‐SDPT300‐SD
Max. Max.Max.
RangeResolution Range Resolution Range Resolution
bar20.002100.01200.02
Psi300.021500.23000.2
Kg/cm
2
2.0400.00210.190.0120.400.02
mmHg150027500101500020
inchHg59.050.05295.20.2590.50.5
meterH
2
020.400.02101.90.1204.00.2
inchH
2
0802140105802010
Atmosphere 1.9740.0029.870.0119.740.02
kPA200.00.21000120002

TransduceroutputAccuracyPT30:±1%ofF.S.
PT150:±1%ofF.S.
PT300:±1%ofF.S.
From10to40oC(50to104oF)includeslinearity,
hysteresis&repeatability
Overloadprotection150%ofmaxcapacity
TransducerSupplyvoltage 9to30VDC
TransducerOutput  4to20mADC
SensorelementDiaphragm Ceramiccell
Thread¼”PS,19teethperinch
OperatingTemperature 32oFto140oF(0oCto40oC)
OperatingHumidityMax80%RH
Size34mmdiameterx134mm(1.3”diameterx5.3”)
Weight8.5oz.(240g)
Cablelength39”(1m)


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