Calibration Procedure; Zero Gas Concentration; Span Gas Concentration - YOKOGAWA ZR22G User Manual

81.92
ez
e2
Calibration curve
before correction
Cell
electromotive
force, mV
e1
es
C
0
21.0
Zero-point correction ratio = (B/A) x 100 (%) Correctable range: 100 ± 30%
Span correction ratio = (C/A) x 100 (%)
Figure 9.5
Figure 9.6 shows a one-point calibration using only a span gas. In this case, only the cell
electromotive force for a span gas with oxygen concentration p1 is measured. The cell
electromotive force for the zero gas is carried over from a previous measurement to obtain the
calibration curve. The principle of calibration using only a span gas also applies to the one-point
calibration method using a zero gas only.
81.92
ez
Cell
electromotive
Calibration curve before
force, mV
correction
e1
es
C
0
21.0
Zero point correction ratio = (B/A) x 100 (%) Correctable range: 100 ± 30%
Span correction ratio = (C/A) x 100 (%)
Figure 9.6
9.1.5 Characteristic Data from a Sensor Measured During
Calibration
During calibration, calibration data and sensor status data (listed below) are acquired.
However, if the calibration is not properly conducted (an error occurs in automatic or semi-
automatic calibration), these data are not collected in the current calibration.
These data can be observed by selecting the [Detailed-data] key from the Basic panel display.
For an explanation and the operating procedures of individual data, consult Section 10.1,
Detailed-data Display.
(1) Record of span correction ratio
Recorded the past ten span correction ratios.
Corrected calibration
curve (theoretical
calibration curve)
p1

Zero gas concentration

Span gas concentration

Oxygen concentration (vol%O
Correctable range: 0 ± 18%
Calculation of a Two-point Calibration Curve and Correction Ratios using Zero and
Span Gases
Previous
zero gas data
Corrected calibration curve
(theoretical calibration curve)
p1
Span gas concentration
Oxygen concentration (vol%O
Correctable range: 0 ± 18%
Calculation of a One-point Calibration Curve and Correction Ratios using a Span Gas
Zero origin
B A
Span origin
p2 0.51
)
2
F9.2E.ai
Zero origin
B A
Span origin
0.51
)
2
F9.3E.ai
<9. Calibration>
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
9-5