Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 90)

IM 11M13A01-04E 8-2
8.2 Current Output Setting
This section describes setting of the analog output range. Table 8.2 shows parameter
codes for the set items.
Table 8.2 Current Output Parameter Codes
Set item Parameter code Set value
Current output C01 0: Oxygen concentration
1: 4 mA (fixed *1)
2: 4 mA (fixed *1)
Output mode C03 0: Linear
1: Logarithm
Min. oxygen concentration C11 Oxygen concentration at 4 mA
Max. oxygen concentration C12 Oxygen concentration at 20 mA
Output damping coefficient C30 0 to 255 seconds
T8.2E.EPS
*1: For the oxygen analyzer, set 0 (zero) only for parameter code C01. When it is set,
the current output is 4-mA fixed regardless of the oxygen concentration.
8.2.1 Setting Minimum Oxygen Concentration ( at 4 mA) and Maximum Oxygen Con-
centration ( 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
ϫ 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 measurement-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.