Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 147)

IM 11M13A01-02E 9-6
9.2.1.2Calibration Procedure
Select both span and zero calibrations or span calibration only or zero calibration only.
Usually select span and zero calibrations.
Select Points from the Calibration setup display and then you can select “Both,” “Span”
or “Zero” (see Figure 9.5 below).
Mode:
᭜
Points:
᭜ Zero gas conc: 1 . 0 0 %
᭜ Span gas conc: 2 1 . 0 0 %
᭜ Timing
Enter
Manual
Semi_Auto
Auto
Calibration setup
F9.4E.EPS
Mode: Manual
᭜ Points:
᭜ Zero gas conc: 1 . 0 0 %
᭜ Span gas conc: 21 . 0 0 %
᭜ Timing
Enter
Both
Span
Zero
Calibration setup
F9.5E.EPS
Figure 9.4 Calibration Setup Figure 9.5 Calibration Setup
9.2.1.3Zero-gas Concentration
Set the oxygen concentration for zero-point calibration. Enter the oxygen concentration
for the zero gas in the cylinder used in the following procedures:
Select Zero gas conc. from the Calibration setup display. The numeric-data entry display
then appears. Enter the desired oxygen concentration for the zero-point calibration. (The
zero-gas set ranges from 0.3 to 100 percent oxygen.)
Enter 00098 for an oxygen concentration of 0.98 percent oxygen by volume.
9.2.1.4Span-gas Concentration
Set the oxygen concentration for span calibration. If instrument air is used as the span
gas, enter 21 percent oxygen.
Select Span gas conc. from the Calibration setup display. Enter the desired span-gas
oxygen concentration from the numeric-data entry display.
(The span-gas set ranges from 4.5 to 100 percent oxygen.)
Enter 02100 for an oxygen concentration of 21 percent oxygen by volume.
Instrument air is here defined as dry air with a dew-point temperature of no higher than
-20
Њ C. If the dew-point temperature is higher than -20Њ C, use a hand-held oxygen
analyzer to measure the actual oxygen concentration.
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.
CAUTION
(1) When instrument air is used for the span calibration, remove the moisture from the
instrument air at a dew-point temperature of -20
Њ C and also remove any oily mist
and dust from that air.
(2)If dehumidifying is not enough, or if foul air is used, the measurement accuracy will
be adversely affected.