Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 177)

IM 11M12D01-01E 10-15
10. Other Functions
10.4.5 Running an Indication Check
10.4.5.1 Manual Indication Check
A manual indication check is performed by following prompts on the screen, and
manually opening or closing valves of calibration gas or third check gas. When solenoid
valves are used, valves are opened and closed automatically at the same time that
messages appear on the screen. The procedure for indication check is virtually the same
as for calibration. Taking a 3-point indication check using zero, span, and third gases for
example, the procedure is described below.
1) Confirm that zero, span, and third gas flow control valves are fully closed, then adjust
supply gas pressure to a sample gas pressure + 50 kPa (but a maximum of 300 kPa)
using regulator valves or air sets on the zero, span and third check gas cylinders.
2) Touch [Setup] on the basic panel display to switch to the Execution/Setup display.
3) Touch [Indication check] and the Indication Check display appears.
4) Touch [Manual Ind. check] then the Enter key. The Manual Ind. check Channel
Select display shown in Figure 10.13 appears.
Enter
Manual ind. check
Ch1
᭜
Ch2
᭜
Ch3
᭜ Ch4
᭜ Ch5
᭜ Ch6
᭜
Ch7
᭜
Ch8
F10.13E.EPS
Select ind. check channel
Enter
᭜
Zero gas ind. check
᭜ Third gas ind. check
F10.14E.EPS
Manual ind. check
Span gas ind. check
Ch2
Fig. 10.13 Channel select screen Fig. 10.14 Manual Span Ind. check
5) Select the channels to be checked (channels in warm-up or error status cannot be
selected). Here Channel 2 is taken as an example.
6) Select [Span indication check] and touch the Enter key. A display like Figure 10.15
appears.
7) Open the span gas flow control valve, and adjust flow rate to 600
Ϯ60 ml/min. If
auto indication check piping and wiring are installed, then span gas starts to flow
automatically.
8) Touch [Start ind. check] touch the Enter key (Figure 10.15). An oxygen concentration
trend graph like Figure 10.16 is displayed, and a [CHK.TIME] status mark blinks.
Watch the trend graph and confirm that the measured value stabilizes. Compare the
measure span gas concentration displayed at the bottom of the display against the
certified concentration of span gas to check for any discrepancy or error.
Enter
F10.15E.EPS
Ch2 Manual ind. check
Open span gas valve.
Set flow span gas to
600ml/min.
Start ind. check
᭜ Cancel ind. check
Fig 10.15 Manual Indication Check Start