Parameters Determining Current - Mettler Toledo InPro6900 Bedienungsanleitung

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Principle of the design of the InPro 6900
The InPro 6900 design is based on a Clark electrode.
It features an additional cathode ring connected to a
separate polarization voltage. This additional cathode,
also designated as "guard ring", consumes the oxygen
diffusing from the bulk electrolyte toward the measuring
cathode. This together with our electrolyte ensures ex-
ceptional signal stability and a very fast response time
of the sensor.

10.3 Parameters determining current

The quantity of oxygen diffused in and the magnitude
of the electrode current are influenced by the following
parameters:
– Oxygen partial pressure of the solution
– Membrane material and thickness
– Size of cathode
– Polarization voltage
– Temperature
– Flow conditions in the solution
InPro 6900
52 201 029
measuring solution
InPro 6900 Series O
A
© 12 / 15 Mettler-Toledo GmbH
Sensor 12 mm
2
polarization
voltage
anode
electrolyte
insulator
cathode
guard ring
membrane
Printed in Switzerland