Dual Point Calibration - Mettler Toledo InPro 6800 Serie Bedienungsanleitung

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20.95 % O
pressure (see instruction manual for the transmitter).
Single point calibration should be sufficient for almost
all process applications.

5.2.4 Dual point calibration

By carrying out a dual point calibration both slope and
zero point of the sensor can be established.
h
Important! In case of a dual point calibration, always
start by the zero point calibration before calibrating
the slope.
Due to the very low zero current of METTLER TOLEDO
sensors, dual point calibration is normally not neces-
sary for standard applications.
As a rule, the zero point should be adjusted to zero
manually, or it is automatically performed by the trans-
mitter (see instruction manual for the transmitter).
A zero point calibration is only advisable if very high
accuracy is required at low oxygen concentrations.
a
Attention! Incorrect zero point calibration is a fre-
quent source of measurement error. For correct cali-
bration, we recommend the use of nitrogen gas or
other oxygen-free medium with a level of purity of
at least 99.995 %.
After the sensor signal has stabilized (after 20...30
minutes), the sensor can be calibrated through the
relevant transmitter to the 100 % value of the desired
measurable variable, e.g. 0 % air, 0.0 % O
(see instruction manual for the transmitter).
InPro 6800
52 200 953 C
, or 8.26 ppm at 25 °C (77 °F) and normal
2
InPro 6800 O
© 02 / 2023 METTLER TOLEDO
Printed in Switzerland
Sensor 12/25 mm
2
, or 0.0 ppm
2