Process Calibration; Dual Point Calibration - Mettler Toledo InPro 6000 Bedienungsanleitung

InPro 6000 Series Optical O

5.3.5 Process calibration

A process calibration is needed in a situation when
the sensor can not be removed from the process.
For detailed information please refer also to the trans-
mitter manual.
Two different routines for process calibration are pos-
sible:
– Process calibration
– Process scaling
Process calibration is performed when a reliable con-
trol value is available and process pressure is known.
Process pressure is only needed if the system is mea-
suring in saturation (% air or % O
units. During this calibration the phase values of the
calibration curve are adjusted.
Process scaling is performed mainly in biopharma
applications after sterilization (autoclaving) when the
user desires to set the system to an initial value. During
this calibration the phase values of the sensor are not
adjusted, only the displayed values and the nA outputs
are rescaled to the desired value.
h
Note: For process calibration the operator can use
either the process pressure or the calibration pressure,
depending on how the reference value is taken.
A fter the sensor signal has stabilized, the complete
measurement system can be calibrated to the desired
variable, e.g. % air, % O
manual for the transmitter).
h
Note: For this type of calibration an accurate refer-
ence value and correct pressure settings are essen-
tial.

5.3.6 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.
A dual point calibration is required after replacement
of the OptoCap.
By carrying out a dual point calibration both phase
angles at zero oxygen (phi 0) and at hundred percent
oxygen (phi 100) of the sensor can be established.
Point 1: Slope correction (with air or other calibration
media with known O
After the sensor signal has stabilized, the complete
meas uring system can then be calibrated to the 100 %
value of the desired measurable variable, e.g. 100 %
air, 20.95 % O
normal pressure (see instruction manual for the
transmitter).
Point 2: Zero point
© 01/ 2016 Mettler-Toledo GmbH InPro 6000 optical O
Printed in Switzerland
Sensors 12 mm
2
, ppm or ppb (see instruction
2
value)
2
, or 8.26 ppm at 25 °C (77 °F) and
2
) or gas (ppm gas)
2
2
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sensors