Product Description; General Information; Principle; Scope Of Delivery - Mettler Toledo InPro 6000 Bedienungsanleitung

InPro 6000 Series Optical O
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Product description

3.1

General information

The optical oxygen sensors with integrated tempera-
ture probe are used for meas ure ment of oxygen.
The sensors are sterilizable and compatible with CIP
(cleaning in place). The sensors InPro 6880 i and
InPro 6860 i are autoclavable (see chapter 5.4, p.18).
3.2

Principle

The optical oxygen sensors are based on an optical de-
tection method, the so called fluorescence quenching.
Here is a short summary of the principle. In contrast to
the polarographic Clark-electrode, which detects a redox
reaction of oxygen at the electrode, the optical method is
based on an energy transfer between a chromophore and
oxygen.
– A chromophore, embedded in the sensor tip is illumi-
nated with blue light. This chromophore absorbs the
energy and if no oxygen is present emits red fluores-
cence light with a specific lifetime. This emitted light
is being detected by a detector in the sensor head.
– In the presence of oxygen, the chromophore transfers
the energy to the oxygen molecule. Oxygen is then
able to transfer this energy as heat to the surrounding
area and no fluorescence is emitted.
– The total intensity of the fluorescence and the lifetime
of the fluorescence is related to the Oxygen partial
pressure in the medium.
– To analyze the lifetime of the fluorescence, the exci-
tation light is pulsed with a constant frequency, the
emitted light shows the same course but with a time
delay to the excitation. This delay is called Phase shift
or Phase angle (Phi). The phase shift is dependent
on the oxygen level and follows the Stern-Vollmer cor-
relation.
– The sensor detects this phase shift and calculates the
oxygen concentration.
– The oxygen value ist digitally transferred to the
transmitter.
3.3

Scope of delivery

Each sensor is supplied fully assembled and factory
tested and calibrated for correct function together with:
– a quality control certificate
– inspection certificats 3.1
(complying with EN 10204.3 / 1 B)
– a maintenance cap (not for InPro 6860 i)
Important! Each sensor is factory calibrated. The data
are stored in the sensor head. If more then one sensors
of the InPro 6880 i are used, pay attention, that the sen-
sor head and the sensor shafts are not being mixed.
Otherwise a new calibration is necessary and the fac-
tory calibration data are not correct.
© 07 / 12 Mettler-Toledo AG
Printed in Switzerland
Sensors 12 mm
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InPro 6000 optical O
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sensors
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