Xylem Lab 970 - Manual (Page 64)

Lists Lab 970
64 ba75558e03 11/2009
Glossary
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).
Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on
the geometry.
Conductivity Short form of the expression, specific electrical conductivity.
It corresponds to the reciprocal value of the resistivity.
It is a measured value of the ability of a substance to conduct an
electric current. In water analysis, the electrical conductivity is a
dimension for the ionized substances in a solution.
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).
Measured variable The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or DO concentration.
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g
solvent.
Reference
temperature
Fixed temperature value to compare temperature-dependent
measured 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
reciprocal value of the electrical conductivity.
Resolution Smallest difference between two measured values that can be
displayed 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 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.
Stability control Function to control the measured value stability.