wtw pH 3150i Operating Manual page 42

Lists
Offset potential
ORP voltage
pH value
Reference
temperature
Reset
Resolution
Sample
Slope
42
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.
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.
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.
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.
The slope of a linear calibration function.
pH 3150i