Xylem ProLab 4000 MULTIPARAMETER BENCHTOP METER - Manual (Page 205)

ProLab 4000 Lists
205 ba75646e02 01/2010
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g
solvent.
Offset potential The measurable potential of a symmetrical electrode, the membrane
of which is immersed in a solution with the pH of the nominal elec-
trode zero point. The zero point is part of the offset potential.
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
water if these substances become effective on an electrode surface
(e. g. a gold or platinum surface).
pH value The pH is a measure of the acidic or basic effect of an aqueous so-
lution. It corresponds to the negative decadic logarithm of the molal
hydrogen ions activity divided by the unit of the molality. The practi-
cal pH value is the value of a pH measurement.
Potentiometry Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the electrode is the electrical potential. The elec-
trical current remains constant.
Reference temperature Fixed temperature value to compare temperature-dependent mea-
sured values. For conductivity measurements, the measured value
is converted to a conductivity value at a reference temperature of 20
°C or 25 °C.
Reset Restoring the original condition of all settings of a measuring system.
Resistance Short name for the electrolytic resistivity. It corresponds to the recip-
rocal value of the electrical conductivity.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
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.
Slope The slope of a linear calibration function.
Stability control Name for a function to check the stability of the measured value.
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
Temperature coefficient Value of the slope of a linear temperature function.