Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 116)

IM 11M13A01-02E 7-17
7. Startup
(7) Follow the instructions in the display as in Figure 7.23 to turn on the zero gas flow.
To do this, open the zero-gas flow valve for the Flow Setting Unit and adjust that
valve to obtain a flow of 600 ml/min.
±
60 ml/min.
(The valve should be adjusted by loosening its lock nut and slowly turning the valve
shaft counterclockwise. Use the calibration gas flowmeter to check the flow.)
Enter
Open zero gas valve.
Set flow zero gas to
600ml/min.
Valve opened
᭜ Cancel calibration
Manual calibration
F7.23E.EPS
Figure 7.23 Zero-gas Flow Display
(for Manual calibration)
(8) If “Valve opened” is selected as in Figure 7.23 , an oxygen-concentration trend
graph (with the oxygen concentration being measured) appears (see Figure 7.25). 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 the zero-gas concentration on the
graph. At this point, no calibration has been executed yet, so even if the measured
value is above or below the zero-gas concentration value, no problem occurs.
Enter
21.00%
0.5min./div
1.00%
21.0%O2 CAL. TIME
Manual calibration
F7.25E.EPS
Figure 7.25 Manual Calibration, Trend Graph