Hach Ultra ORBISPHERE 511, Быстрое руководство

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Page 10
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 procedure is the same as for the O
2
sensor.
In the case of the "In air" calibration, the sensor
me asu re s O
2
d uring calibrat ion. Th e 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.
H
2
Sensor Calibration
T h e r e c o m m e n d e d m e t h o d i s a t k n o w n
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 calibration
gas (Direct Value) in gas phase at atmospheric
pressure.
Make sure the H
2
concentration used for
calibration is within the acceptable range for the
membrane.
TC Gas Sensor Calibration
Calibration of the Measured Gas
Before initiating a calibration process, the
calibration parameters must be set by pressing on
t h e M o d i f y b u t t o n . T h e l a s t c a l i b r a t i o n
parameters are memorized, so this step can be
ignored if the correct parameters are already set.
Similarly, if only the calibration value has
changed, then this can be updated directly
instead of pressing the
Modify button.
Modify Calibration Parameters
• Gas Phase: Select liquid or gas (direct
calibration only)
• Gas unit type: Partial , fraction or
dissolved
(dissolved is for calibration in a liquid
only)
• Gas unit: The list of available units
depends on unit type selected above.
• Liquid: Select as appropriate.
• Enter the gas concentration according to
the value in the calibration media.
• Hold during calibration: On by default,
this stops any output from the instrument
during the calibration process to avoid
sending invalid information to any
connected device.
• Automatic calibration stop: If selected,
when the stability criteria is reached, the
calibration process stops automatically.
• Interferences enabled: If selected, this
takes into account the influence of
interferences during calibration. By
default the same interferences as during
measurement are selected.
Press OK to start calibration
Calibration (cont)