wtw inoLab 740, Operating Manual

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Dilution water Designation for the water which is used to dilute a water
sample that is to be analyzed.
The dilution water is a water saturated with air of the purity
degree 3 (acc. to EN ISO 3696) that has been mixed with
electrolyte solutions.
If the dilution water was mixed with bacteria (innoculation
water), the mixture is referred to as innoculated dilution
water.
Details on the production of dilution water are laid down in
EN 1899-1.
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 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.
End measurement Measurement of the oxygen content of sample dilution
and dilution water after expiry of the incubation period.
Firmware Software installed on an instrument (here: measuring
module) that is fixed and cannot be changed.
Incubation period Storage period (usually 5 or 7 days) of sample dilutions
and dilution water at a specified temperature (20 °C) in the
dark.
ISA English abbreviation for a sample conditioning solution,
which is used to adjust the ionic strength of a sample.
Ionic Strength Adjustment
Measured parameter The measured parameter is the physical dimension
determined by measuring, e. g. pH, conductivity or D. O.
concentration.