Xylem ProLab 3000 LABORATORY pH METER - Manual (Page 179)

ProLab 3000 Lists
179 ba75645e02 01/2010
ORP voltage 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).
pH value The pH is a measure of the acidic or basic effect of an aqueous so-
lution. It corresponds to the negative decadic logarithm of the molal
hydrogen ions activity divided by the unit of the molality. The practi-
cal pH value is the value of a pH measurement.
Potentiometry 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.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
Slope The slope of a linear calibration function.
Stability control Name for a function to check the stability of the measured value.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Test sample Designation of the test 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.
Zero point Designation for the offset potential of a pH electrode. It is the mea-
surable potential of a symmetrical electrode, the membrane of which
is immersed in a solution with the pH of the nominal electrode zero
point (pH = 7).