Dual Point Calibration; Temperature Calibration; Autoclaving Of The Sensor Shaft - Mettler Toledo InPro 6880 i Série Instructions D'utilisation

InPro 6880 i Series O

5.2.4 Dual point calibration

To receive a maximum accuracy of the measured val-
ues over the full measuring range, a dual point calibra-
tion is required.
By carrying out a dual point calibration both phase
angle at zero oxygen (phi 0) and phase angle at hun-
dred percent oxygen (phi 100) of the sensor can be es-
tablished.
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.
Attention! Incorrect zero point calibration is a
frequent source of measurement error. For correct
calibration, 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, the sensor can
be calibrated through the relevant transmitter to the 0%
value of the desired measurable variable, e.g. 0% air,
0.0% O
manual for the transmitter).

5.2.5 Temperature calibration

In the case of a difference between the displayed tem-
perature and the otherwise measured temperature, a
temperature calibration can be performed.
5.3

Autoclaving of the sensor shaft

Attention! Only the sensor shaft with the installed op-
to-cap is autoclavable. The sensor head has to be re-
moved before autoclaving.
Prior to autoclaving, the maintenance cap has to
be screwed on the sensor shaft to protect the fibre
optics.
If the sensor head is separated from the sensor shaft,
all connectors have to be protected with the enclosed
caps. Soiling of the fibre optics may result in detection
errors.
Before assembling, all connectors have to be checked
for soiling.
© 09/07 Mettler-Toledo AG
Printed in Switzerland
Sensor 12 mm
2
, or 0 ppm at 25 ˚C / 77 ˚F (see instruction
2
Maintenance cap
15
InPro 6880 i
52 206 256