Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 128)

IM 11M12D01-01E 8-2
The range low and high values are restricted as follows:
The range min. O
2
concentration value (corresponding to 4 mA output) can be set to
either 0% O
2
or in the range 6 to 76% O
2
.
The range max. O
2
concentration value (corresponding to 20 mA output) can be set to
any value in the range 5 to 100% O
2
, however the range max. setting must be at least
1.3 times the range min. setting.
If you do not observe this restriction, the measurement will be invalid, and any previous
valid value will be used. The gray area in figure represents the valid setting range.
Setting example 1: If the range minimum (corresponding to 4 mA output) is set to 10%
O
2
then range maximum (corresponding to 20 mA output) must be at least 13% O
2
.
Setting example 2: If the range minimum (corresponding to 4 mA output) is set to 75%
O
2
then range maximum (corresponding to 20 mA output) must be at least 75x1.3=98%
O
2
(rounding decimal part up).
F8.3.EPS Minimum oxgen concentration, %O 2 (for a minimum current of 4mA)
Maximum oxgen concentration, %O2 (for a maximum current of 20mA)
5
15
25
35
45
55
65
75
85
95
5 15 25 35 45 55 65 75
Ranges over which oxygen
concentrations can be set
Outside ranges
Fig 8.3 Minimum-Maximum setting range of oxygen concentration
< Default setting>
Both range 1 and the second range range 2 are set to 0 to 25% O
2
prior factory shipment.