Product Description; General Information; Principle - Mettler Toledo InPro 6950 Serie Bedienungsanleitung

InPro 6950 Series O
3

Product description

3.1

General information

The oxygen sensor InPro 6950 with integrated tem-
perature probe is used for meas ure ment of oxygen at
low concentrations.
The sensor is sterilizable and compatible with CIP
(cleaning in place).
InPro 6950 sensors with ISM™ functionality offer
Plug and Measure as well as enhanced diagnostics
features.
3.2

Principle

The InPro 6950 is a Clark polarographic O
that has been expanded with a separate reference
and guard ring electrode. This 4-electrode system is
characterized as follows:
a) The measurement system of this InPro 6950
sensor consists of a working electrode (cathode),
a counter electrode (anode), a reference electrode
and a guard ring electrode. The measurement
system is separated from the process medium by
an oxygen permeable membrane.
b) The transmitter supplies a constant voltage to
the cathode and the guard ring electrode so that
oxygen can be reduced on both electrodes.
c) The oxygen molecules migrate from the measure-
ment medium through the membrane to the
cathode to which the voltage is supplied and are
reduced. At the same time, oxidation takes place
at the anode and oxygen and water are released
into the electrolyte. This causes a current to flow
between the anode and cathode which is directly
proportional to the partial pressure of oxygen
(pO
d) The guard ring electrode built into the sensor
reduces the oxygen that migrates to the side of the
cathode and can distort the measurement.
The guard ring electrode therefore enables traces
of oxygen to be precisely determined at even the
lowest concentrations.
© 02 / 2023 METTLER TOLEDO
Printed in Switzerland
Sensor 12 mm
2
) in the process medium.
2
15
sensor
2
InPro 6950
52 206 137 F