Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 165)

<13. COMMISSIONING OF DO (Dissolved Oxygen)>
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IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
13.7.3 Auto Return
When no operation is performed for the time set in “Auto Return”, the display returns to the
Monitor display (or to the Main display when the MONITOR display is disabled) and the analyzer
returns to a normal measuring mode. (When the Trend display is selected, the Auto Return
doesn’t work.)
Select the time from among Disable, 10 min, and 60 min. When the Auto Return function is not
used, select “Disable.”
NOTE
A default is “10 min”. When maintenance like a calibration that may take much time is performed,
“60 min” or “Disable” is recommended to be selected.
13.7.4 Adjust contrast
The LCD screen contrast can be adjusted.
Pressing the ▲▼ keys adjusts the contrast in 11 levels from +5 to –5 (including the default value
of “0”).
13.7.5 MONITOR display
Select “Enable” so that the Monitor display becomes available. A default is “Enable”.
During Hold/Wash condition and a warning/fault condition, the Main display or the Home display
is displayed to indicate the condition.
13.8 Calculated data setup
On this setup, parameters can be set for calculated data.
When two modules are installed on the instrument, the calculated data can be set for values
measured by two sensors.
Select “Differential” or “Average” on the Calculated data setup screen.
Differential: A difference between measurement values measured by a sensor 1 and sensor 2
is an output as a calculated result.
(Diff) (value of the sensor 1) – (value of the sensor 2)
Average: The average of measurement values measured by a sensor 1 and sensor 2 is an
output as a calculated result.
(Ave) (value of the sensor 1 + value of the sensor 2) / 2
To display the calculated result, select “Calculated” on the Dual display screen. (Section 13.7.1.)
(The setting on the “Individual display” has no effect.)
While displaying a calculated data, measurement value of the sensor 1 or sensor 2 can be
checked on the each sensor’s display with pressing
Sensor
1
or
Sensor
2
at the lower right on the Main
display.
Pressing returns the display to the original calculated data display.
A calculated data can be set as a process parameter on the “mA (Output)” setup screen. (Section
13.3.)