Methods Of Operating Valves In The Za8F Flow Setting Unit - YOKOGAWA ZR402G User Manual

(4) After the measured oxygen concentration is stabilized, touch the [ENT] key, then all the
digits flash. Touch the [ENT] key again to display "ZEro Y". Disconnect the power cord to
stop the pump.
<Flow of zero gas>
Touch the [ENT] key to display a zero gas value set with the parameter code B01. Touch the
[ENT] key again to flash "OPEn" and the "measured oxygen concentration" alternately. To cause
the zero gas flow, follow these steps:
(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 valve back slowly
counterclockwise. At that time, the flow rate also decreases as the inner pressure of the gas
cylinder decreases. Monitor the flow check and, when the ball's position changes greatly,
readjust the valve.
(3) Touch the [ENT] key after the measured oxygen concentration becomes stable. Then all the
digits flash. Touch the [ENT] key again so that the "CALEnd" flashes.
NOTE
Be sure not to terminate the 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
calibration twice.
(4) Stop the zero gas flow. 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. When the output stabilization time elapses, the calibration is complete.
<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.
10.6 Methods of Operating Valves in the ZA8F
Flow Setting Unit
The ZA8F Flow Setting Unit is used as the calibration equipment 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 Unit each time calibration is made (starting and stopping the calibration
gas flow and adjusting the flow rate). For the operation of the converter, refer to Section 7.11.
<10. Other Functions>
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
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