wtw pH/Cond 3320 - Page 89

pH/Cond 3320 Glossary
ba77054e03 03/2018 89
General topics
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 prac-
tice, this dimension cannot be measured directly. Therefore, the practi-
cal salinity according to IOT is used for oceanographic monitoring. It is
determined by measuring the electrical conductivity.
Salt content General designation for the quantity of salt dissolved in water.
Temperature coeffi-
cient
Value of the slope of a linear temperature function.
Temperature compen-
sation
Name of a function that considers the temperature influence on the
measurement and converts it accordingly. Depending on the measured
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 potentiomet-
ric measurements, the slope value is adjusted to the temperature of the
test sample but the measured value is not converted.
α
T
Ref
=
Meas
*
1
1+
a
(T - )
*
T
Ref
Adjusting To manipulate a measuring system so that the relevant value (e.g. the
displayed value) differs as little as possible from the correct value or a
value that is regarded as correct, or that the difference remains within
the tolerance.
AutoRange Name of the automatic selection of the measuring range.
Calibration Comparing the value from a measuring system (e.g. the displayed
value) to the correct value or a value that is regarded as correct. Often,
this expression is also used when the measuring system is adjusted at
the same time (see adjusting).
Channel A channel is a display indication that corresponds to a physical connec-
tion on the meter.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e.g. pH, conductivity or D.O. concentration.
Measured value The measured value is the special value of a measured parameter to be
determined. It is given as a combination of the numerical value and unit
(e.g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be dis-
played by a meter.
Stability control (Au-
toRead )
Function to control the measured value stability.