Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 171)

IM 11M13A01-02E 10-20
10.6.3 Operating the Zero Gas Flow Setting Valve
Operate the zero gas flow setting valve during zero-point calibration in the following
procedures:
(1) When the display shown in Figure 10.17 appears during calibration, open the zero
gas flow setting valve of the flow setting unit and adjust the flowrate to 600
±
60
ml/min. To rotate the valve shaft, if the valve has a lock nut loosen the lock nut and
slowly turn it counterclockwise. To check the flowrate, monitor the calibration gas
flow meter.
Enter
Open zero gas valve.
Set flow span gas to
600ml/min.
Valve opened
᭜ Cancel calibration
Manual calibration
F10.17E.EPS
Figure 10.17 Manual Calibration Display
(2) Adjust the flowrate and select Valve opened from the Manual calibration display.
Check the Trend graph display to see that the measured value is stabilized. Then
press the [Enter] key. The Manual calibration display shown in Figure 10.18 appears.
Enter
Zero calibration
Close the zero gas valve.
Span calibration
᭜ End
Manual calibration
F10.18E.EPS
Figure 10.18 Zero-point Calibration Complete (in Manual Calibration)
(3) Close the zero gas flow setting valve to stop the zero gas flow. If the valve has a
lock nut, be sure to tighten the lock nut to prevent the any leakage of the zero gas
into the sensor because the valve may become loose during measurement.
10.6.4 Operation After Calibration
No special operation of the instrument is needed after calibration. However, it is
recommended that the pressure regulator for the zero gas cylinders be closed because
calibration is not required so often.