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8.5 Zero calibration (air point calibration in case of zirconia O
2
sensor)
This is used for adjusting the zero point.
Flow the zero gas (0.3N/min.) by adjusting the needle
valve of pressure regulator and wait until the indica-
tion stabilizes.
When the Zirconia O
2
sensor is used, use air.
Note)
When the indication has stabilized, select the measur-
ing range to be calibrated by using the keys.
When using a multi-component analyzer, all the
components undergo zero calibration simulta-
neously at the selected range.
Press the
ZERO
key, and
ZERO
key lamp will
flicker.
Next press the
CAL
key and conduct zero calibra-
tion.
The
CAL
key lamp lights steadily during calibra-
tion.
Since the measuring status is resumed after the cali-
bration, carry out the calibration for other ranges if
necessary.
Note: When using different gases for the low and high ranges, apply 9 to 10 Vol. % O
2
/N
2
which has
been set for the low range.
When the function for automatic calibration is provided, the solenoid valve turns on and cali-
bration gas flows upon pressing the
ZERO
key.
NO
NO
NO
ZERO
CALSPANZEROENT
Flickers
CALSPANZEROENT
Lights
CAL
( Lamp is turned off after calibration )
CALSPANZEROENT