Calibration; Purpose Of Calibration - Mettler Toledo InSUS H60i Bedienungsanleitung

InSUS H60i
This limit can be set to an individual value by the user.
Using the transmitter (M400
These settings are also active if the
nected to a controller with an analog output. The switch off
temperature should be set at least 5° higher than the high-
est process temperature.
perature is 37 °C (99 °F), 42 °C (104 °F) should be the
minimum setpoint. In this situation, as soon as the tem-
perature exceeds 42 °C (104 °F) the
measuring and the LED will be switched off. For the switch
on, a hysteresis of 3° is implemented, meaning that the
sensor head
temperature drops below 39 °C (101 °F).
Manual switch off of the sensor head (M400 / M800
transmitter)
The sensor head
transmitter 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 transmitter
menu, or via a remote signal (digital input).
Remote switch off of the sensor head (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
switched off. As soon as the "Hold Mode" is off, the optical
sensor head
settings.
5�2

Calibration

5�2�1 Purpose of Calibration
The manual of the transmitter also contains information
about calibration.
Calibration must be performed every time a new single-use
sensor is connected to the
Since the correlation between the measured phase and the
oxygen value is not linear, a calibration of an optical sensor
must be performed very accurately. Wrong calibrations
may significantly reduce the measurement accuracy.
Each single-use oxygen
phase angle at zero oxygen (phi 0) and hundred percent
air saturation (phi 100).
Several methods for calibration 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
h Note: Please take into account the correct air pressure
and humidity� Small deviations in air (± 3 %) are due to
differences in humidity and process pressure settings�
The sensor head
to dissolved oxygen measurement�
h General remarks:
• Calibration must be performed after
ilization of the single-use device.
• For calibration in gas the single-use device in which the
single-use sensor is integrated must be filled with air
(phi 100) or zero point gas (phi 0)�
• Make sure that the settings for oxygen saturation of the
calibration is correct and remains constant during cal-
ibration.
• In the event of calibration in water or
the calibration medium must be in equilibrium with the
air� Oxygen exchange between water and air is very
slow. Therefore it takes
saturated with atmospheric oxygen.
© 09 / 2022 METTLER TOLEDO
Printed in Switzerland
For example, if the process tem-
(and LED) will be switched on as soon as the
can be switched off manually via the
sensor head
will continue to measure using the previous
or CO with a purity of at least
2 2
calculates for 100 % humidity if it is set
or M800) or with iSense™.
sensor head is con-
sensor head
and the sensor head
InSUS head.
sensor has its own individual
quite a long time until water is
will stop
LED are
99.995
irradiation ster-
process medium,
InSUS H60i
30 802 188 A
11
%.