YSI IQ SensorNet 2020 XT Terminal - Manual (Page 138)

Settings/setup System 2020 XT USB
5 - 18 ba76019e01 12/2012
5.7 Sensor-sensor link
(automatic inclusion of an influence quantity)
The Sensor-sensor link function automatically provides a sensor with
the measured value of another sensor in the IQ S
ENSOR N ET system.
Example
Measurement of the D.O.
concentration
D.O. sensors measure the D.O. partial pressure and use the solubility
function of oxygen in the test sample to calculate the D.O.
concentration (mg/L).
The solubility of oxygen in water is influenced by the salt content (the
salinity) of the solution and other factors such as the temperature or air
pressure.
Static salinity correction To take into account the influence of the salinity on the D.O.
concentration, many D.O. measuring systems provide a function where
you can manually enter the salinity value. The sensor includes the
salinity and provides a corrected measured value.
This type of static salinity correction is especially suitable for test
samples with almost unchanging salinity.
To obtain optimum measurement results even with changing salinity
values, the actual salinity has to be determined and entered for each
measurement of the D.O. concentration.
Dynamic salinity
correction
A dynamic salinity correction is provided by the Sensor-sensor link
function.
This function supplies the D.O. sensor continuously with the current
salinity value and is thus especially suitable for the continuous
measurement of the D.O. concentration with changing salinity values.