Ism Design; Changing The Electrolyte, The Membrane Body Or The Interior Body - Mettler Toledo InPro 6850i Bedienungsanleitung

InPro 6850i / 6900i / 6950i O
Many sample media contain volatile substances
which, even at very low concentrations, have a
clearly perceptible smell. Similarly to oxygen, these
substances are able to invade the electrolyte through
the gas-permeable membrane. Accordingly, they
become noticeable when changing the electrolyte. In
most cases, such substances have absolutely no
influence on the measuring properties of the sensor.
Slight discoloration of the electrolyte also has no ef-
fect on the measuring properties.

6.1.4 ISM design

The integrated ISM functionality allows an extensive
monitoring of the sensor. The following parameters are
stored in the sensor:
– serial no.
– type of sensor
– order no.
– calibration data
– CIP/ SIP counter
– slope
– zero point
When starting the following automatic test proce-
dures are implemented:
– dgital communication
– plug & measure
– pre-calibration
– predictive maintenance
6.2 Changing the electrolyte, the membrane body
or the interior body
Note: The InPro 6900i and 6950i use a special
electrolyte which contains an oxygen scavenger. This
electrolyte ensures fast response time and together
with the guard ring increases the signal stability of
the sensor. The electrolyte must be exchanged on a
regular basis or when the sensor has been exposed
to the air for more than 24 hours without a watering
cap filled with conditioning solution.
Note: The content of the electrolyte bottle has to be
used within 3 months after opening.
If the membrane and/or the interior body exhibits
signs of failure (long response time, increased cur-
rent in an oxygen-free medium, mechanical damage,
etc.) the membrane body and/or the interior body
has to be replaced.
© 02 / 09 Mettler-Toledo AG
Printed in Switzerland
Sensor 12 / 25 mm
2
InPro 6850i, 6900i, 6950i
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