wtw pH 3300i Operating Manual page 65

pH 3300i/3400i
Offset potential
ORP voltage
pH value
Potentiometry
Reset
Resolution
Slope
Standard solution
Test sample
ba75682e02 03/2008
The measurable potential of a symmetrical electrode, the membrane
of which is immersed in a solution with the pH of the nominal electrode
zero point. The asymmetry is part of the offset potential.
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).
The pH is a measure of the acidic or basic effect of an aqueous solu-
tion. It corresponds to the negative decadic logarithm of the molal hy-
drogen ions activity divided by the unit of the molality. The practical pH
value is the value of a pH measurement.
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.
Restoring the original condition of all settings of a measuring system.
Smallest difference between two measured values that can be dis-
played by a measuring instrument.
The slope of a linear calibration function.
The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
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