Xylem ProLab 2000 - Manual (Page 113)

ProLab 2000 Lists
113 ba75577e05 11/2013
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 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.
D.O. partial pressure Pressure caused by the oxygen in a gas mixture or liquid.
D.O. saturation Short name for the relative D.O. saturation.
Note: The D.O. saturation value of air-saturated water and the D.O.
saturation value of oxygen-saturated water are different.
Electrode zero point The zero point of a pH electrode is the pH value at which the
electromotive force of the pH electrode at a specified temperature is
zero. Normally, this is at 25 °C.
Electromotive force of
an electrode
The electromotive force (voltage) U of the electrode is the measurable
electromotive force of an electrode in a solution. It equals the sum of
all the galvanic voltages of the electrode. Its dependency on the pH
results in the electrode function, which is characterized by the
parameters, slope and zero point.
Junction The junction is a porous body in the housing wall of reference
electrodes or electrolyte bridges. It forms the electrical contact
between two solutions and makes electrolyte exchange more difficult.
The expression, junction, is also used for ground or junction-less
transitions.
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).