InPro 6000 Aperometric O
2
Sensors 23
© 06 / 2019Mettler-ToledoGmbH AmperometricSensorSeries
30 313 395 B PrintedinSwitzerland
5 Operation
5.1 Start-up and polarizing
Whenthesystemisoperatedforthersttimeorifthesensor
hasbeendisconnectedfromthevoltagesource(transmitter
or O
2
sensormaster)forlongerthan5minutes,thesensor
hastobepolarizedpriortocalibrationbyconnectingittothe
operatingO
2
transmitterortoasensormaster.After6hours,
thesensorwillbefullypolarizedandreadyforoperation.
For polarizing and storage the cleaning and conditioning
solution (order Nr. 52 200 255) is recommended. This
solutioncontainsanoxygenscavengerwhichensuresthat
theelectrolyteofthesensordoesnotcomeintocontactwith
oxygenwhennotinuse.
h
Attention:TheInPro6950ishouldneverbepolarizedatair!
It is recommended to store the sensors in the according
electrolyteorcleaningandconditioningsolutionduringthe
polarizationtime.TheInPro6900iand6950iuseaspecial
electrolytewhichcontainsanoxygenscavenger.
a
Warning: Setting of the polarization voltage on the
transmitter for correct measurements:
Standardapplications:–675mV.
Measurementsofcontinuouslylowestoxygenconcentrations
(<500ppb in liquids or<10,000 ppm [vol.] ingases)
andInpresenceofvolatileacidiccomponents(e.g.carbon
dioxideduringmeasurementsinbreweries):–500mV.
5.2 Calibration
WithdigitalISMsensorsallcalibrationdataarestoredinthe
sensor.Oncelledwithelectrolyteandpolarizedtheycanbe
connectedtoanISMtransmitterandimmediatelyusedfor
measurement.Analogsensorsaredeliveredwetandafter
polarizationcanbeslope1-pt,2pt-orprocesscalibrated
usingatransmitter.
With ISM sensors METTLER TOLEDO’s calibration
and maintenance software tools iSense/iSense light
are recommended for sensor checking and calibration.
(www.mt.com/iSense).
Polarizationvoltageforcalibrationpurposesarealwaysput
to–675mV.
Formeasurements incarbondioxidecontainingsolutions
the transmitter setting has to be switched to –500 mV
accordinglyafterthecalibration.
6 Maintenance
Ifthemembraneand/ortheinteriorbodyexhibitssignsof
failure(longresponsetime,increasedcurrentinanoxygen-
freemedium,mechanicaldamage,etc.)themembranebody
and/ortheinteriorbodyhastobereplaced.
The incorporated Intelligent Sensor Management (ISM)
technologymonitorsandreportstheremaininglifetimeof
theinnerbodiesastheDynamicLifetimeIndicator.
Dependingontheaggressiveness(CIP/SIP)oftheapplication
conditionsareplacementofelectrolyte,themembranebody
or the interior body is recommended. This maintenance
can be performed by using the transmitter’s calibration
menu and/or using METTLER TOLEDO’s calibration and
maintenancetooliSense(www.mt.com/iSense).
Fordetailedmaintenancedescriptionandcriteriapleaserefer
toiSenseorthemainsensormanual.
en