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Product description
3.1
General information
The sensor InPro 6900 with integrated temperature
probe is used for meas ure ment of oxygen at low
concentrations.
The sensor is sterilizable and compatible with CIP
(cleaning in place).
InPro 6900 sensors with ISM functionality offer Plug
and Measure as well as enhanced diagnostics
features.
3.2
Here is a short summary of the principle of polaro-
graphic measurement on which this sensor is based
(Clark 1961).
a) The Clark polarographic sensor basically consist
of a working electrode (cathode), a counter/refer-
ence electrode (anode), and an oxygen permeable
mem brane which separates the electrodes from the
sample medium.
b) The transmitter supplies a constant polarization
voltage to the cathode, needed to reduce oxygen.
c) The oxygen molecules which migrate through the
permeable membrane are reduced at the cathode.
At the same time, oxidation takes place at the an-
ode and oxidized anode metal (silver) is liberated
as silver ions into the electrolyte. The electrolyte
closes the electric circuit between anode and cath-
ode (ion conductivity).
d) The current produced by the reactions described
above is measured by the transmitter and is pro-
portional to the partial pressure of oxygen (pO
the sample medium.
Additionally, the InPro 6900 features a guard ring cath-
ode which guarantees rapid response by the sensor
and good signal stability at low DO concentrations.
Please refer to «Section 10 - Theory of the polaro-
graphic sensor» for further information.
3.3
Each sensor is supplied fully assembled and factory-
tested for correct function together with:
– a quality control certificate
– inspection certificates 3.1 B
(complying with EN 10204.3/1 B)
See electrolyte order details at section „Spare Parts",
9.3.
InPro 6900
52 201 029
Principle
Scope of delivery
InPro 6900 Series O
© 12 / 15 Mettler-Toledo GmbH
Sensor 12 mm
2
Printed in Switzerland
) in
2
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