Operation After Calibration - YOKOGAWA ZR22G User Manual

(2) Next, adjust the flow rate to 600 ± 60 ml/min (the flow check ball stops floating on the green
line when the valve is slowly opened). Turn the regulator of the zero gas valves back slowly
counterclockwise. At that time, the flow rate also decreases as the inner pressure of the gas
cylinder decreases. Therefore, monitor the flow check and, when the ball's position changes
greatly, readjust the valve.
(3) Select "Valve opened" (to start calibration) 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. Then stop the zero gas flow
immediately. Turn the zero gas valve regulator fully clockwise. If this valve regulator is not
properly adjusted, the needle valve will not close completely and a cylinder gas may leak.
Manual calibration
Zero calibration
Close the zero gas valve.
Span calibration
 End
Figure 10.18
NOTE
Be sure not to terminate a calibration in progress because of a shortage of gas in the cylinder.
Each gas cylinder is operable for nine minutes or more provided the gas is discharged at the
specified rate. Therefore, if your calibration time is estimated at four minutes, you can operate the
zero-point calibration twice.
<Treatment after completion of calibration>
(1) Fully close the stop valve mounted on the calibration gas inlet of the detector.
(2) Remove the tube connecting the detector to the standard gas unit.
WARNING
Store the standard gas unit with the gas cylinder mounted where the ambient temperature does
not exceed 40°C. Otherwise, the gas cylinder may explode. Store the spare gas cylinders under
the same condition.
10.8 Methods of Operating Valves in the ZA8F
Flow Setting Unit
The ZA8F Flow Setting Unit is used as a calibration device for a system conforming to System
2. Calibration in such a system is to be manually operated. So, you have to operate the valve of
the Flow Setting each time calibration is made (starting and stopping the calibration gas flow and
adjusting the flow rate). This applies even if you are using the ZR40H Automatic Calibration Unit.
For operation of the converter, see Section 7.12, earlier in this manual.
Enter
F10.18E.ai
Zero gas Calibration Complete (in Manual Calibration Display)
<10. Other Functions>
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
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