Xylem WQ-FDO Sensor and GL500-7-2 Data Logger - Manual (Page 28)

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In the DO Setup tab the input channel number and units are defined; however, this is
only for the purpose of telling the software which channel data to use for
calculations. It is in the Analog setup tab that the calibration of each sensor is
performed, see section XI. If the DO sensor is physically connected to channel 1 of
the data logger; it must be defined in the DO tab as channel 1, be properly calibrated
on channel 1 in the analog setup tab, and the units in each tab must match. A
warning message will appear when the units between these two tabs do not match.
This is an example of a message warning
that the units for the WQ-FDO sensor on
channel 1 do not match in the Analog and
DO tabs. The units must match and be
spelled the same.
Below is an example of the Analog Setup screen for the FDO sensor system. Note
that the display channels for each sensor and calculated results match between this
screen and the DO Setup tab previously shown. Also that the Enable checkboxes
are checked to allow the display and download of the data. The WQ-FDO sensor is
required for this software to operate, both the partial pressure and temperature
outputs of the sensor must be connected to the logger. They need not be enabled
for display, but they must be connected. If the optional conductivity and barometric
pressure sensors are not connected and a manual entry is used, the unused analog
channels can be connected to any other sensor. If any of the calculated output
values of saturation, concentration and salinity are not wanted for display and
download, they do not need to be enabled and the sensor channel can be used for
any other type of sensor. If they are displayed, the analog channel they are
assigned to is unavailable, even
though there is no sensor
connected to it.
Calibration is required on all channels
that have a sensor connected.
Calculated channels of concentration,
saturation and salinity do not require
calibration values of Low and High
EU and Raw Data. Low and High
Display values for these calculated
numbers scale the display only.