Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 123)

IM 11M12A01-05E 9-6
9.2 Calibration Procedures
CAUTION
Calibration should be made under normal operating conditions (if the probe is connected
to a dryer, the analyzer will undergo calibration under the operating conditions of the
dryer). To make a precise calibration, conduct both zero-point and span calibrations.
9.2.1 Calibration Setting
The following sets forth the required calibration settings:
9.2.1.1Mode
There are three calibration modes available:
(1) Manual calibration which allows zero and span calibrations or either one manually in
turn;
(2) Semi-automatic calibration which lets calibration start with the touchpanel or a
contact input, and undergoes a series of calibration operations following preset
calibration periods and stabilization time; and
(3) Automatic calibration which is carried out automatically following preset calibration
periods.
Calibrations are limited by the following mode selection:
• When manual calibration is selected:
Manual calibration only can be conducted. (This mode does not allow semi-automatic
calibration with a contact input nor automatic calibration even when its start-up time
has reached.)
• When semi-automatic calibration is selected:
This mode enables manual and semi-automatic calibrations to be conducted.
(The mode, however, does not allow automatic calibration even when its start-up time
has reached.)
• When automatic calibration is selected:
This calibration can be conducted in any mode.
9.2.1.2Calibration Procedure
Select both span and zero calibrations or span calibration only or zero calibration only.
Usually select span and zero calibrations.
9.2.1.3Zero-gas Concentration
Set the oxygen concentration for zero-point calibration. Enter the oxygen concentration
for the zero gas in the cylinder used.
9.2.1.4Span-gas Concentration
Set the oxygen concentration for span calibration. If instrument air is used as the span
gas, enter 21 %O
2
.
When using the ZO21S Standard Gas Unit (for use of the atmospheric air as a span gas),
use a hand-held oxygen analyzer to measure the actual oxygen concentration, and then
enter it.