Calibration; Purpose Of Calibration; What You Have To Know For Calibration - Mettler Toledo InPro 6000 G Serie Bedienungsanleitung

InPro 6800 G / 6850i G / 6900i G / 6950i G O
Important! Setting of the polarization voltage on the
transmitter for correct measurements:
– S tandard applications InPro 6800 G / 6850i G:
– 675 mV
– M easurement of permanently low oxygen concen-
trations (< 500 ppb in liquids or < 10,000 ppm
[vol.] in gases) in the presence of volatile acidic
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 con-
sumption or after exchange of electrolyte or mem-
brane body. To ensure high measurement accuracy of
the sensor, a calibration must be carried out regu-
larly, 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:
– F or calibration in gas (e.g. air), the sensor
membrane must be dry outside, since adhering
water drops can falsify the measured oxygen value.
– M ake sure that the oxygen saturation index of
the calibration medium is correct and remains
constant during calibration.
– F or correct calibration, a minimum flow rate of the
calibration medium is necessary.
– M ake sure that all other parameters, such as
temperature and pressure, are constant.
For continuous applications, we recommend pe-
riodic recalibration in line with your requirements
© 03 / 23 METTLER TOLEDO
Printed in Switzerland
12 mm
2
InPro 6000 G Series
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