Caution, Warning – Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual
Page 170
IM 11M12A01-03E
10-22
(1) Use the needle of the zero gas valve “ CHECK GAS “ to puncture a hole in the gas
cylinder installed as described in Section 10.5.2. Fully clockwise turn the valve
regulator by hand.
(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 clock-
wise. If this valve regulator is not properly adjusted, the needle valve will not close
completely and a cylinder gas may leak.
Enter
Zero calibration
Close the zero gas valve.
Span calibration
᭜
End
Manual calibration
F10.18E.EPS
Figure 10.18 Zero-gas Calibration Complete (in Manual Calibration Display)
CAUTION
• 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 needle 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 tempera-
ture does not exceed 40
ЊC. Otherwise, the gas cylinder may explode. Store the spare
gas cylinders under the same condition.