Manual Calibration - YOKOGAWA EXAxtZR Instruction Manual

CAUTION

7.12.2 Manual Calibration

7.12.2.1 Preliminary
7.12.2.2 Calibration Procedures
IM 11M12A01-02E
(2) Span-gas concentration
With "Span gas conc" selected in the Calibration setup display, display the Numeric-
data Entry display and enter an oxygen concentration value for the span-gas calibra-
tion; If instrument air is used, enter 02100 for a 21 vol% O
When using the ZO21S Standard Gas Unit (for use of the atmospheric air as a span
gas), use a hand-held oxygen analyzer to measure the actual oxygen concentration,
and then enter it.
If instrument air is used for the span gas, dehumidify the air down to a dew point of -
20 C and remove any oil mist or dust.
Before performing manual calibration, be sure that the ZA8F Flow Setting Unit zero-gas
flow valve is fully closed. Open the zero-gas cylinder pressure regulator so that the
secondary pressure equals measured gas plus approx. 50 kPa (or measured gas pressure
plus approx. 150 kPa when a chack valve is used, maximum pressure rating is 300 kPa).
This applies even if you are using the ZR40H Auto Calibration Unit.
This manual assumes that the instrument air is the same as the reference gas used for the
span gas. Follow the steps below to conduct manual calibration:
(1) Press the Setup key in the basic panel display to display the Execution/Setup display.
Then select Calibration in the Execution/Setup display. In doing so, the Calibration
display as in Figure 7.17 appears.
Calibration
Manual calibration
Figure 7.17 Calibration Display
(2) Press the [Enter] key to select span-gas calibration. The Manual calibration display
shown in Figure 7.18 then appears. Check that the oxygen concentration for the span
gas in this display coincides with the oxygen concentration in the calibration gas
actually used. If the check results are assumed to be OK, select Next in the Manual
calibration display.
Manual calibration
Check the span gas
concentration value
Next
Cancel calibration
Change value:
Enter
F7.17E.EPS
Figure 7.18 Manual Calibration
7. Startup
value.
2
2 1 . 0 0%
Enter
F7.18E.EPS
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