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8.6 Span calibration (low concentration point calibration in case of zirconia O
2
sensor)
Carry out span calibration by flowing calibration gas at
the concentration set as a span value.
Flow the calibration gas (0.3 N/min.) by adjusting the
needle valve of pressure regulator. Wait until the indica-
tion stabilizes, and then conduct span calibration.
Press the
SPAN
key and the
SPAN
key lamp flickers.
In the case of a multi-component analyzer, the main
indication will flicker for the components which
can be calibrated.
Press the COMP key and the settable gas compo-
nent will change.
When the gas component has been determined,
press the keys and select a range.
Note: The lamp will not flicker in the case of a
single-component analyzer.
Next press the
CAL
key and conduct span calibration.
The
CAL
key lamp lights steadily during calibration.
Since the measuring status is resumed after calibration,
continue the calibration for each component and each
range.
Note: On the low range of zirconia type O
2
sensor, when zero gas is calibrated with 9 to 10 Vol. % O
2
,
the zero and span calibrations interfere with each other. So, each calibration should be re-
peated a few times.
When the function for automatic calibration is provided, the solenoid valve turns on and the
span gas for the selected component flows upon pressing the SPAN key.
NO
NO
NO
CAL
NO
SPAN
( )
CALSPANZEROENT
Flickers
CALSPANZEROENT
Flickers
COMP
CALSPANZEROENT
lights
CALSPANZEROENT
(In case of a multi component analyzer)
( Lamp is turned off after calibration )