Xylem Cond 1970i - Manual (Page 64)

Lists Cond 1970i
64
Salinity The absolute salinity S
A
of seawater corresponds to the relationship
of the mass of dissolved salts to the mass of the solution (in g/Kg). In
practice, this dimension cannot be measured directly. Therefore, the
practical salinity is used for oceanographic monitoring. It is deter-
mined by measuring the electrical conductivity.
Salt content General designation for the quantity of salt dissolved in water.
Sample Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
Slope The slope of a linear calibration function.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
TDS Total dissolved solids
TDS factor In conductometric measurements, the measuring instrument calcu-
lates the total dissolved solids (TDS) from the electric conductivity of
the test sample. For the calculation, a simple multiplication factor be-
tween 0.4 and 1.0 suffices. The exact factor depends on the quality of
the water to be examined and has to be determined for each water
type.
Temperature
coefficient
Value of the slope of a linear temperature function.
Temperature
compensation
Name of a function that considers the temperature influence on the
measurement and converts it accordingly. Depending on the mea-
sured parameter to be determined, the temperature compensation
functions in different ways. For conductimetric measurements, the
measured value is converted to a defined reference temperature. For
potentiometric measurements, the slope value is adjusted to the tem-
perature of the test sample but the measured value is not converted.
Temperature function Name of a mathematical function expressing the temperature behav-
ior of a test sample, a sensor or part of a sensor.