Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 85)

<8. Detailed Data Setting>
8-2
IM 11M12A01-04E
8.2.1 Setting Minimum Oxygen Concentration ( at 4 mA) and Maximum Oxygen
Concentration ( at 20 mA)
Set the oxygen concentration values at 4 mA and 20 mA.
The minimum concentration of oxygen for the minimum current (4 mA) is 0% O
2
or 6% to 76% O
2
.
The maximum concentration of oxygen for the maximum current (20 mA) ranges from 5% to 100%
O
2
, and must be greater than 1.3 times the concentration of oxygen set for the minimum. If it does not
fall within this input range setting, the setting will be invalid, and the previous set values will remain.
Setting example 1
If the setting (for a 4 mA current) is 10% O
2
, you must set the oxygen concentration for the maximum
(20 mA) point at 13% O
2
.
Setting example 2
If the setting (for a 4 mA current) is 75% O
2
, you must set the oxygen concentration for the maximum
(20 mA) point at 98% O
2
(75 × 1.3).
(Numbers after the decimal point are rounded up.)
CAUTION
• When you select logarithmic mode, the minimum output remains constant at 0.1% O
2
, and the
parameter 「C11」 display remains unchanged.
8.2.2 Entering Output Damping Constants
If a measured value adversely affected by a rapid change in the sample gas oxygen concentration is
used for the control means, frequent on-off actions of the output will result. To avoid this, the converter
allows the setting of output damping constants ranging from 0 to 255 seconds.
8.2.3 Selection of Output Mode
You can select a linear or logarithmic output mode. The former provides linear characteristics between
the analog output signal and oxygen concentration.
8.2.4 Default Values
When the analyzer is delivered or data are initialized, the output current settings are by default as
shown in Table 8.3.
Table 8.3 Output Current Default Values
Item Default setting
Min. oxygen concentration 0% O
2
Max. oxygen concentration 25% O
2
Output damping constant 0 (seconds)
Output mode Linear
CAUTION
• When you select logarithmic mode, the minimum output remains constant at 0.1% O
2
, and the
parameter 「C11」 display remains unchanged.