MembraneMaintenance - Extech Instruments ExStik DO600 User Manual

ClearingStoredReadings
1. WiththeunitONpressandholdtheON/OFFbuttonfor4seconds
2. When"clr"isshowninthemaindisplaythememoryiscleared.
MeasurementandDisplayConsiderations
TheDO600usesapolarographicsensor,whichconsumesoxygenatthesensingsurface.
Thisrequiresaconstantmovementofthesampleacrossthemembranetomaintaina
constantdissolvedoxygenlevel.Itisrecommendedthattheprobebemovedinthesample
asthemeasurementismade,orifinalaboratoryenvironment,thesamplebestirredusing
astirplate.
IfyouaremeasuringDOinasmallcontainer,theprobewillconsumeoxygenasitis
measuringandthemeasurementvaluewillcontinuetogolower.
Iftheunitappearstobelocked(displayfrozen).ItispossiblethattheDataHoldmodehas
beeninadvertentlyaccessedbyapressoftheMODE/HOLDbutton(HOLDwillbedisplayed
inthebottomleftoftheLCD).SimplypresstheMODE/HOLDbuttonagainorturnthe
meteroffandbackonagain.
Ifthemeterdoeslatchupandnobuttonpressesreviveit,removethebatteriesandrestart.
Formaximumaccuracy,allowsufficienttimeforthetemperatureoftheprobetoreachthe
temperatureofthesamplebeforetakingareading.Thiswillbeindicatedbyastable
temperaturereadingonthedisplay.

MembraneMaintenance
Firstuse
Whenyoufirstgotouseanewmeter,youwillneedtoremovethemembranecapand
replaceitwithanewcapfilledwithrefillsolution.
PleaseNote:Theinstallationofabondedcapcausesthemembranetobetightlystreched
overthecathode.Onceabondedcapisremovedreinstallationisnotpossibleasthe
membranewillnolongerbeproperlystrechedoverthecathode.

Storage
Thespongecontainedintheprotectiveelectrodecapshouldbeonlymoistened(notsoaked)
with(distilledwater)orcleantapwater.

7 DO600-en-GB_V7.4 12/16