Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 101)

IM 11M12A01-05E 8-4
“Mix ratio” setting range
The minimum mix ratio is set to 0 kg/kg or ranges from 0.201 to 0.625 kg/kg. The
maximum mix ratio setting ranges from 0.2 to 1.0 kg/kg, and must be greater than 1.3
times plus 0.187 the mix ratio set for the minimum.
Setting example 1
If the setting (for a 4 mA current) is 0 kg/kg, you must set the maximum (20 mA) point
at more than 0.2 kg/kg.
Setting example 2
If the setting (for a 4 mA current) is 0.201 kg/kg, you must set the maximum (20 mA)
point at more than 0.449 kg/kg, (0.201 3 1.3 + 0.187 kg/kg). (Numbers after the
decimal point are rounded up.)
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.201 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65
Maximum mixing ratio, kg/kg at 20 mA
Minimum mixing ratio, kg/kg at 4 mA
Ranges over which oxygen
concentrations can be set
Outside ranges
1
0.95
Figure C Max. and Min. Mix Ratio Set Ranges