Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 122)

IM 11M12D01-01E 7-12
14) Select [Valve opened (Start Calibration)] and touch the [Enter] key. An oxygen
concentration graph like Fig. 7.15 is displayed, and [CAL.TIME] status mark flashes.
Wait for the graph measured value trace to stabilize. Calibration has not yet been
performed, so it is not a problem if the displayed value is different from the correct
value of zero gas concentration.
F7.15E.EPS
Enter
21.00%
Ch1
1min./div.
0.98%
0.98 %O2
Manual cal.
CAL. TIME
Fig. 7.15 Display during calibration
15) When the graph trace stabilizes, touch the [Enter] key. The display changes to like
Fig. 7.16. The measured value is adjusted to read the same as the zero gas concentra-
tion set value, and a check mark appears in the check box beside Zero calibration.
Close the zero gas flow setting valve and tighten the lock nut used to prevent it from
loosening during measurement.
Enter
F26E.EPS
Ch1 Manual cal.
Span calibration
Zero calibration
Span calibration
᭜
End
Close the zero gas valve.
Fig. 7.16 Calibration complete
16) Select [End] and touch the [Enter] key. The oxygen concentration graph is displayed
and the [HOLD TIME] status mark appears. The graph trace changes gradually from
zero gas concentration to measured gas concentration. During this "Output settling
time" if "Output hold" is set, then the analog output is held at the corresponding
preset value. For details of "Output hold" refer to "Sec. 8.1.2 Output hold setting".
Shipping-time default setting is for settling time to be set to 3 minutes. After the
settling time has elapsed then the display reverts to channel select (Fig. 7.10) so that
you can select another channel for calibration. If you touch the enter key during
settling time then settling time is skipped and you are returned to the channel select
display.