YOKOGAWA ZR22G User Manual page 114

Table 7.1 Display Items
Item
Oxygen
concentration
Air ratio
Moisture content
Output item 1
Output item 2
AO output 1
AO output 2
Favorite
*1: If an analog output damping constant is set, the oxygen concentration display then includes these settings.
Favorite settings
l
(1) "Display settings" > "Favorite settings"
(2) "Favorite settings" can have up to four items.
Figure 7.9 Favorite settings
About the Air ratio:
l
"Air ratio" is defined as the ratio of (the amount of air theoretically required to completely burn all
the fuel) to (the amount of air actually supplied).
For this equipment, the air ratio will be obtained in a simplified way by measuring the oxygen
concentration in the exhaust gas. The air ratio may be expressed mathematically by:
m = { 1 / ( 21- Oxygen concentration ) }  21
If you use the air ratio data for estimating the combustion efficiency, etc., check that no air is
leaking in beforehand and that the measured value has not been affected by any interference
gas (CH , CO, H , etc.).
4 2
1st display 2nd, 3rd
item display item
○ ○
○
○
○ ○
○ ○
○
○
○
3rd display item
only
<7. Startup>
Display
Oxygen concentration during measurement
Current computed air ratio
Moisture content (%H O) in the exhaust gas
2
Oxygen concentration with the equipment set for
oxygen analyzer (See *1 below.)
Oxygen concentration with the equipment set for
oxygen analyzer (See *1 below.)
Current value output from analog output 1
Current value output from analog output 2
IM 11M12G01-02EN
7-7
1sh Edition : Mar. 25, 2021-00