Calibration; Purpose Of Calibration - Mettler Toledo InPro 6000 Bedienungsanleitung

InPro 6000 Series Optical O
This limit can be set to an individual value by the user.
Using the transmitter (M400 ot M800) or with iSense.
These settings are also active if the sensor is connected
to the process with an analog connection (nA). The
switch off temperature should be set at least 5° higher
then the highest process temperature. For example, if the
process temperature is 37 °C / 99 °F, 42 °C / 104 °F
should be the minimum set-point. In this situation, as
soon as the temperature exceeds 42°C/ 104°F the sen-
sor will stop measuring and the LED will be switched off.
For the switch on, a hysteresis of 3° is implemented,
meaning that the sensor (and LED) will be switched on
as soon as the temperature drops below 39°C/101°F.
Manual switch off of the sensor
(M400/M800 transmitter)
The sensor can be switched off manually via the trans-
mitter menu (see the transmitter manual) by setting the
LED mode to "off". To restart the measurement, the LED
mode needs to be set manually to "on" via the trans-
mitter menu, or via a remote signal (digital input).
Remote switch off of the sensor
(M400/M800 transmitter)
The M400 transmitter can be set to "Hold" by applying
an external digital signal (see the transmitter manual).
In this situation the sensor and the sensor LED are
switched off. As soon as the "Hold Mode" is off, the op-
tical sensor will continue to measure using the previ-
ous settings.
5.3

Calibration

5.3.1 Purpose of calibration

Information about the calibration, you find also in the
manual of the transmitter.
Calibration should be performed at least after each
change of the OptoCap, sterilizing or after autoclaving
the sensor.
Since the correlation between the measured phase and
the oxygen value is not linear, a calibration of an opti-
cal sensor must be performed very accurately. Wrong
calibrations may significantly reduce the measurement
accuracy and result in incorrect calculation of the
Dynamic Lifetime Indicator (DLI) and the Adaptive Cal-
ibration Timer (ACT).
Each oxygen sensor has its own individual phase
angle at zero oxygen (phi 0) and hundred percent air
saturation (phi 100). Both values are subject to change,
for example, after exchange of OptoCap or because of
normal ageing of the OptoCap.
Depending on the sensor type several methods for cal-
ibration are available for the optical oxygen sensors.
The highest measurement accuracy is achieved by
performing a 2-point calibration with air and a zero gas
e.g. N
InPro 6970 i a purity of 99.99 % is required.
© 07 / 12 Mettler-Toledo AG
Printed in Switzerland
or CO with a purity of at least 99.9 %. For the
2
2
Sensors 12 mm
2
InPro 6000 optical O
15
sensors
2
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