Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 104)

<7. Startup>
7-16
IM 11M12A01-02E
(3) Follow the display message in Figure 7.19 to turn on span gas flow. Open the span gas flow
valve for the Flow Setting Unit by loosening the valve lock nut and slowly turning the valve
shaft counterclockwise to flow the span gas at 600 ± 60 ml/min. Use the calibration gas
flowmeter to check the flow.
Enter
Open span gas valve.
Set flow span gas to
600ml/min.
Valve opened

Cancel calibration
Manual calibration
F7.19E.ai
Enter
21.00%
0.5min./div
1.00%
21.0 %O
2
CAL. TIME
Manual calibration
F7.20E.ai
Figure 7.19 Span gas Flow Display Figure 7.20 Span gas Trend Graph
(for Manual Calibration)
(4) If “Valve opened” is selected as in Figure 7.19 , an oxygen concentration trend graph (with
the oxygen concentration being measured) appears (see Figure 7.20). The CAL.TIME in
the bottom area of the panel flashes. Observe the trend graph and wait until the measured
value stabilizes in the vicinity of 21% on the graph. At this point, calibration has not yet been
executed yet, so even if the measured value is above or below 21%, no problem occurs.
(5) After the measured value has stabilized, press the [Enter] key to display the “Span
calibration complete” display shown in Figure 7.21. At this point, the measured value is
corrected to equal the span gas concentration setting. Close the span gas flow valve. The
valve lock nut should be tightened completely so that the span gas does not leak.
Enter
Span calibration
Close the span gas valve.
Zero calibration

End
Manual calibration
F7.21E.ai
Enter
Check the zero gas
concentration value
Next

Cancel calibration
 Change value: 1.00%
Manual calibration
F7.22E.ai
Figure 7.21 Span Calibration Complete Figure 7.22 Zero Gas Concentration
Zero Calibration Check Display
Start Display (in Manual Calibration)
(6) Select “Zero calibration” as in Figure 7.21 to display the zero gas concentration check
display (Manual calibration) . Check that the zero gas oxygen concentration value and the
calibration gas oxygen concentration value agree. Then select “Next” as in Figure 7.22.
8th Edition : Jan.13,2012-00