Calibration; Purpose Of Calibration; What You Have To Know For Calibration - Mettler Toledo InPro 6800 G Bedienungsanleitung

InPro 6800 G / 6850i G / 6900i G / 6950i G O
components (e.g. carbon dioxide during measure-
ments in breweries) e.g. InPro 6900i G / 6950 i G:
– 500 mV
Note: To ensure the supply of the correct polari za tion
voltage the transmitter must be set according to the
transmitter manual.
5.2

Calibration

5.2.1 Purpose of calibration

Each oxygen sensor has its own individual slope and
own individual zero point. Both values are subject
to change, for example, through electrolyte consump-
tion or after exchange of electrolyte or membrane
body. To ensure high measurement accuracy of
the sensor, a calibration must be carried out regular-
ly, but at least after each change of electrolyte or
membrane. Prior to calibration, the sensor has to be
polarized for at least 6 hours.
Important: Please remove the protection cap from
the sensor, rinse the sensor with water and dry it
wait at least 10 minutes before starting calibra-
tion. Store sensor upright with membrane pointing
down.
Note: To check if your sensor needs a recalibra-
tion, you may dry it and take it in the air to check
that the reading is close to 100 %. If not, then the
sensor needs a new calibration.
With ISM sensors all calibration data are stored in the
sensor.

5.2.2 What you have to know for calibration

General remarks:
– For calibration in gas (e.g. air), the sensor
membrane must be dry outside, since adhering
water drops can falsify the measured oxygen value.
– Make sure that the oxygen saturation index of
the calibration medium is correct and remains
constant during calibration.
– For correct calibration, a minimum flow rate of the
calibration medium is necessary.
– Make sure that all other parameters, such as
temperature and pressure, are constant.
For continuous applications, we recommend periodic
recalibration in line with your requirements on
accuracy, the type of process in operation and
your own experience. The frequency of the need for
re calibration depends very much on the specific
application, and therefore appropriate intervals can-
not be exactly defined here.
© 02 / 17 Mettler-Toledo GmbH
Printed in Switzerland
12 mm
2
InPro 6000 G Series
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