Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 109)

IM 11M12A01-03E 7-17
7. Startup
(2)Press the [Enter] key to select span-gas calibration. The Manual calibration display
shown in Figure 7.18 then appears. Check that the oxygen concentration for the span
gas in this display coincides with the oxygen concentration in the calibration gas
actually used. If the check results are assumed to be OK, select Next in the Manual
calibration display.
(3) Follow the display message in Figure 7.19 to turn on span gas flow. Open the span-
gas flow valve of the Flow Setting Unit by loosening the valve lock-nut and slowly
turning the valve shaft counterclockwise to set the span gas flow 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.EPS
Enter
21.00%
0.5min./div
1.00%
21.0 %O2 CAL. TIME
Manual calibration
F7.20E.EPS
Figure 7.19 Span-gas Flow Display Figure 7.20 Manual Calibration Trend
(for Manual Calibration) Graph
(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 percent on the graph. At this point,
calibration has not yet been is executed, so even though the measured value is above
or below 21 percent, 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. 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.EPS
Enter
Check the zero gas
concentration value
Next
᭜ Cancel calibration
᭜ Change value: 1.00%
Manual calibration
F7.22E.EPS
Figure 7.21 Span Calibration Figure 7.22 Zero-gas Concentration
Complete Zero Calibration Start Check Display
Display (in Manual Calibration)
(in Manual Calibration)
(6)Select Zero calibration as in Figure 7.21 to display the zero-gas concentration check
display (in 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.