Xylem Cond 1970i User Manual

Page 63

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Cond 1970i

Lists

63

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 with-
in the tolerance.

AutoRange

Name of the automatic selection of the measuring range.

AutoRead

WTW name for a function to check the stability of the measured value.

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. Of-
ten, this expression is also used when the measuring system is adjust-
ed 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 cur-
rent. In water analysis, the electrical conductivity is a dimension for the
ionized substances in a solution.

Conductometry

Name of the conductivity measuring technique.

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).

Measuring system

The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and sensor. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.

Molality

Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.

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 specific electrolytic resistance. It corresponds to
the reciprocal value of the electrical conductivity.

Resolution

Smallest difference between two measured values that can be dis-
played by a measuring instrument.

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