Operating The Zero Gas Flow Setting Valve; Operation After Calibration - YOKOGAWA ZR22G User Manual

(2) Adjust the flow rate 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 10.16 appears.
Close the span gas flow setting valve to stop the span gas (air) flow. If the valve has a lock
nut, be sure to tighten the lock nut to prevent any leakage of span gas into the sensor during
measurement.
Figure 10.34
10.12.3

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 10.19 appears during calibration, open the zero gas
flow setting valve of the flow setting unit and adjust the flow rate 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 flow rate, monitor the calibration gas flowmeter.
If the sample gas pressure is extremely high, adjust the sample gas pressure to obtain
pressures (listed in Table 10.7) ± 10%.
Figure
10.35
(2) Adjust the flow rate 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 10.20 appears.
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 detector
because the valve may become loose during measurement.
10.12.4

Operation After Calibration

No special operation of the instrument is needed after calibration. However, it is recommended
that the pressure reducing valve for the zero gas cylinders be closed because calibration is not
required so often.
(1)
Span Gas Manual calibration
Zero Gas Manual calibration
<10. Other Functions>
(2)
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
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