Yokogawa AC8 Calibration Units - Manual (Page 19)

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IM 11M06D03-01E-A
8.2.3 SPAN-GAS CONCENTRATION
Set the oxygen concentration for span calibration. If instrument air is used as the span gas, enter 21 %O2.
1) Select Span gas conc. from the Calibration setup display.
2) Enter the desired span-gas oxygen concentration from the numeric-data entry display. (The span-gas set
ranges from 4.5 to 100 %O2.)
3) Enter 02100 for an oxygen concentration of 21 vol%O2.Instrument air is here defined as dry air with a
dew-point temperature of no higher than -208˚C.
If the dew-point temperature is higher than -208˚C, use a hand-held oxygen analyzer to measure the actual
oxygen concentration.
(1) When instrument air is used for the span calibration, remove the moisture from the instrument air at a
dew-point temperature of -208C 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.
8.3 MANUAL CALIBRATION
For manual calibration, consult Section 7.12, “Calibration,” In the ZR22G / ZR402G Instruction Manual (IM 11M12A01-02E)
8.4 SEMI-AUTOMATIC CALIBRATION
To start calibration, follow these steps:
(1) Press the Setup key in the basic panel display to display the Execution/Setup display.
(2) Then select Calibration from the Execution/Setup display. The Calibration display shown in Figure 8.4
appears.
(3) (2) Select Semi-auto calibration to display the Semi-automatic calibration display shown in Figure 8.4
(4) (3) Select Start calibration. The display shown in Figure 8.4 appears, and then start calibration.
Figure 8.4
CAUTION