Hach Ultra ORBISPHERE 510, Руководство оператора

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60 of 138 Calibration Menu - Orbisphere 510/511/512 Analyzers
Operator Manual
ORBISPHERE
5.2.3 O
3
Sensor Calibration
The sensor is either in contact with:
• Air at atmospheric pressure (In Air)
• O
3
at known concentration (Direct Value). The gas can be dissolved or not.
The procedure is the same as for the
O
2
sensor. In the case of the "In air" calibration, the
sensor measures
O
2
during calibration. The O
3
coefficient is deduced taking into account
how the sensor behaves in
O
2
. As a different voltage is used at the anode to measure
O
2
and O
3
, the O
3
measurement takes a long time to stabilize. To facilitate the follow up
after an "O
3
in air" calibration, negative values can be displayed.
5.2.4 H
2
Sensor Calibration
WARNING
Handle H
2
gas with great care! It is extremely flammable and explosive.
The recommended method is at known concentration (Direct Value). The gas can be
pure H
2
or a mixture of H
2
with an inert gas (e.g. a mixture of H
2
/N
2
). The known
concentration is entered by the user in the calibration parameter window. The sensor is
in contact with the calibration gas (Direct Value) in gas phase at atmospheric pressure.
CAUTION:
Make sure the H
2
concentration used for calibration is within the acceptable range for
the membrane. Hach Ultra recommends the following calibration gas/inert gas
combinations for calibrating with the following membranes. See the Sensor
Maintenance Manual for further details on membrane specifications:
Membrane Recommended calibration gas
2956A 1% H
2
/ 99% N
2
2952A 5% H
2
/ 95% N
2
2995A 10% H
2
/ 90% N
2
29015A 100% H
2