Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 116)

IM 11M12A01-03E 8-4
8.1.2 Setting Minimum Current (4 mA) and Maximum Current (20 mA)
To set the minimum humidity to 50% H
2
O and the maximum humidity to 100% H
2
O,
follow these steps:
(1) Select Setup in the Execution/Setup display.
(2) Select the mA-output setup in the “Commissioning” (Setup) display.
(3) Select mA-output1 in the mA-outputs display.
(4) Select the Max. humidity conc. in the mA-output1 range display and press the
[Enter] key. The numeric-data entry display then appears. Enter the humidity value
for the maximum current (20 mA); for example, enter “100” for 100% H
2
O.
CAUTION
For the humidity measurement, 0% H
2
O is a default setting for the minimum humidity
and 25% H
2
O is the default for the maximum humidity. If you first attempt to set 50%
H
2
O for the minimum humidity, you cannot set it because that value is outside the set
range. In such a case, set the maximum humidity first.
(5) Select the Min. humidity conc. and enter a minimum humidity value, e.g.,
050 for 50% H
2
O.
(6) Follow the above steps to set the mA-output2, if necessary.
8.1.3 Entering Output Damping Constants
If a measured value which is adversely affected by rapid changes in the measurement
object is used as the basis for control, frequent on-off actions of the output may result.
To avoid this, the analyzer allows the setting of output damping constants ranging from
0 to 255 seconds. Select the appropriate output damping constant from the numeric-data
entry display. To set 30 seconds, enter 030.
8.1.4 Selection of Output Mode
You can select linear or logarithmic output mode. Press the [Enter] key in the output
mode display. A linear/logarithmic selection display then appears. Select your desired
mode.
CAUTION
When you select logarithmic mode, the minimum output remains constant at 0.1% O
2
,
and the humidity remains set to 0.1% H
2
O and mixing ratio is set to 0.01 kg/kg.