Yokogawa AC8 Calibration Units - Manual (Page 18)

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IM 11M06D03-01E-A
8.2 CALIBRATION
The converter is calibrated in such a way that the actual zero and span gases are measured and those measured
values are used to agree with the oxygen concentrations in the respective gases. There are three types of calibration
procedures available:
Manual calibration: conducting zero and span calibrations, or either of these calibrations in turn. Manual
calibration needs the MC1 Manual Calibration Unit to allow manual supply of the calibration gases.
Semi-automatic calibration which uses the touch panel or a contact input signal and conducts calibration
operations based on a preset calibration time and stable time.
Automatic calibration conducted at preset intervals. Semi-automatic and automatic calibration needs the
AC1 Automatic Calibration Unit to allow automatic supply of the calibration gases. The following sections set
forth the manual calibration procedures. For details on semi-automatic and automatic calibrations, consult
Chapter 9, “Calibration,” in the ZR22G/ZR402G Instruction Manual.
8.2.1 MODE SETTING
For the mode setting, do the following:
1) Press the Setup key in the basic panel display to display the Execution/Setup display.
2) Select Maintenance in the Execution/Setup display to display the Maintenance panel display.
3) Then select Calibration setup to display the Calibration setup display as Figure 8.3 shows.
4) Select Mode in this panel, and then select “ Manual,” “Semi-Auto” or “Auto.”
Figure 8.3
8.2.2 ZERO-GAS CONCENTRATION
Set the oxygen concentration for zero-point calibration. Enter the oxygen concentration for the zero gas in the
cylinder used in the following procedures:
1) Select Zero gas conc. from the Calibration setup display. The numeric-data entry display then appears.
2) Enter the desired oxygen concentration for the zero-point calibration. (The zero-gas set ranges from 0.3 to
100 %O2.)
3) Enter 00098 for an oxygen concentration of 0.98 vol % O2.