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6.2.3 H
O calibration by matching with values obtained by
2
manual analysis
This method does not use the calibration cell. Calibration is carried out without uninstalling the receiver unit
and the transmitter unit.
6.2.3.1 Required data
(1) H
O concentration measured by manual analysis
2
(2) H
O concentration measured by the laser gas analyzer at the same time as the manual analysis
2
6.2.3.2 Preparation for span calibration
Calibration gas concentration should be calculated by following procedure prior to span calibration.
(1) Check the time took for manual analysis and the H
(2) Average the H
O concentration values measured by the laser gas analyzer over the same time as manual
2
analysis.
For example, if you carried out the manual analysis from 9:00 to 9:30, average the H
measured by the laser gas analyzer from 9:00 to 9:30.
(3) Plug the values obtained in the above steps 1 and 2 into the following equation to calculate the span
calibration coefficient.
Coefficient of span calibration =
e.g.: When manual value in the step 1 is 15[vol%] and average value of H
in the step 2.
Coefficient of span calibration=
The following procedures should be conducted just before starting the span calibration.
(4) Check on the H
O span calibration screen that the fluctuation of the measured values is within ±1 vol%.
2
Calculate the mean value of appropriately 10 seconds.
(5) Plug the mean value obtained in the step 4 and the span calibration coefficient in the step 3 into the fol-
lowing equation to obtain the calibration gas concentration.
Calibration gas concentration = Mean concentration × Span calibration coefficient
For example, when the mean value is 5 vol% and the span calibration coefficient is 1.5, the calibration
gas concentration is:
5 [vol%] × 1.5 = 7.5 [vol%]
INZ-TN8ZSS-E
O concentration measured by the manual analysis.
2
Manual analysis value in the step 1 [vol%]
Average H
O concentration in the step 2 [vol%]
2
15 [vol%]
= 1.5
10 [vol%]
- 49 -
O concentration
2
O concentration is 10 [vol%]
2
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