Operating The Zero Gas Flow Setting Valve; Operation After Calibration - YOKOGAWA EXAxtZR Instruction Manual

10.6.3 Operating the Zero Gas Flow Setting Valve

10.6.4 Operation After Calibration

10-20
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 ml/min
± 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.
If the measurement gas pressure is extremely high, adjust the measurement gas
pressure to obtain pressures (listed in Table 10.6) ± 10%.
Table 10.6
Measurement gas pressure (kPa)
Flowrate (ml/min)
Manual calibration
Open zero gas valve.
Set flow span gas to
600ml/min.
Valve opened
Cancel calibration
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.
Manual calibration
Zero calibration
Close the zero gas valve.
Span calibration
End
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.
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.
50 100 150 200
500 430 380 250
T10.6E.EPS
Enter
F10.17E.EPS
Enter
F10.18E.EPS
250
320
IM 11M12A01-02E