Xylem WQ-FDO Sensor and GL500-7-2 Data Logger - Manual (Page 27)

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The Dissolved Oxygen Setup Tab shown above is made up of two sections, Inputs
and Outputs. The Inputs section tells the software which input channel is used for
each sensor, and what the engineering units are. In the case of the optional
conductivity and barometric pressure sensors; there is a checkbox for indicating
manual entry, and a numerical field for inputting manual conductivity and pressure
settings should a sensor not be used. The Outputs section controls the display of
the calculated values of dissolved oxygen concentration, percent saturation and
salinity. These values are calculated based on the sensor inputs, or manual entry.
There is a checkbox to enable the display and download of each parameter, which
channel it will be displayed on, and the display units for concentration. The units of
saturation are fixed as percent, salinity is fixed at PSS (Practical Salinity Scale).
The Inputs Section in the screen above shows the WQ-FDO O
2
Sensor connected to
the logger input channel 1, with units in mbar. The water temperature sensor is
connected to channel 2, and is the temperature output of the WQ-FDO sensor
calibrated in degrees Centigrade. For the conductivity input, channel 3 is selected
in units of uS/cm. Manual entry is selected for the barometric pressure sensor in
units of feet, zero feet is entered in the data field (sea level).
The Outputs section shows the calculated oxygen concentration displayed and
downloaded to channel 5 in units of mg/L, O
2
Saturation in percent displayed on
channel 6, and salinity calculated from conductivity displayed on channel 7.