YOKOGAWA ZR202S, User Manual, Page: 104 / 163

<9. Calibration>
9-5
IM 11M13A01-04E
9.2 Calibration Procedures
CAUTION
Calibration should be made under normal operating conditions (if the probe is connected to a furnace,
the analyzer will undergo calibration under the operating conditions of the furnace). To make a precise
calibration, conduct both zero and span calibrations.
9.2.1 Calibration Setting
The following sets forth the required calibration settings:
Mode
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 touch panel or a contact input, and
undergoes a series of calibration operations following preset calibration periods and stabilization
time.
(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.
Calibration Procedure
Select both span and zero calibrations or span calibration only or zero calibration only.
Usually select span and zero calibrations.
Zero gas Concentration
Set the oxygen concentration for zero calibration. Enter the oxygen concentration for the zero gas in
the cylinder used.
Span 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.