10 Optional Functions
100
10.2 O
2
Correction
The stack gas from the fixed discharge source, when measured, gives a diluted, low
concentration value due to the air mixture amid the stack path.
This is why when measuring the nitrogen oxides from the fixed discharge source, the suitable
correction according to the oxygen concentration in the discharged gas is included in the
enforcement regulations of Clean Air Act.
For the measurement of carbon monoxide correction for industrial waste incinerator, too, the
correction according to the oxygen concentration is required.
The operation for the oxygen correction is as follows:
21 (vol%) － O
2
set value (vol%)
O
2
corrected concentration ＝ × measurement value (ppm)
21 (vol%) － O
2
measurement value (vol%)
O
2
set value (vol%) is a concentration set depending on the fuel facility as well as fuel type.
Two types of O
2
values can be set.
10.2.1 O
2
conversion correction setting
This section describes the operation of setting O
2
corrected concentration.
1. Press the [MENU] key in the MEAS. screen.
Press the [X] key three times to display the MENU 4/5 (OPTION menu) screen.
Fig. 75 MENU 4/5 (OPTION menu) screen
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