Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 73)

IM 11M12D01-01E 4-7
4. Piping
4.1.6 Piping for Indication check
To perform an indication check using the third check gas, the piping to allow the third
gas to flow into the calibration gas line is required for the ZA8F Flow Setting Unit in
addition to the system configuration shown in Figure 4.1.
Connect the piping from the third check gas cylinder through a pressure reducing valve
and a stop valve, along with the span gas line, to the zero gas inlet of the ZA8F Flow
Setting Unit. To perform an indication check, open the stop valve on the line from the
third gas cylinder, while open the stop valve on the span gas line to perform span point
calibration.
Span gas cylinder
(Instrument air)
Zero gas cylinder
Air Set
Pressure regulator
Instrument air
Stop valve
Flowmeter
Needle valve
Reference gas
line
Calibration gas
line
ZA8F flow setting unit
Third check gas cylinder
Reference gas
line
Calibration gas
line
ZA8F flow setting unit
Flowmeter
Needle valve
F3.eps
Figure 4.8 Piping to ZA8F Flow Setting Unit for Indication Check Using 3rd
Check Gas