Oxi 3310 IDS (Oxi 3315)
Glossary
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13 Glossary
Dissolved oxygen
General information
OxiCal
®
WTW name for a procedure to calibrate D.O. measuring systems in
water vapor saturated air.
Salinity
The absolute salinity S
A
of seawater corresponds to the relationship
of the mass of dissolved salts to the mass of the solution (in g/Kg). In
practice, this dimension cannot be measured directly. Therefore, the
practical salinity according to IOT is used for oceanographic monitor-
ing. It is determined by measuring the electrical conductivity.
Salt content
General designation for the quantity of salt dissolved in water.
D.O. partial pressure
Pressure caused by the oxygen in a gas mixture or liquid.
D.O. (oxygen) satura-
tion
Short name for the relative D. O. saturation.
Slope (relative)
Designation used by WTW in the D.O. measuring technique. It
expresses the relation of the slope value to the value of a theoretical
reference sensor of the same construction type.
Resolution
Smallest difference between two measured values that can be dis-
played by a meter.
AutoRange
Name of the automatic selection of the measuring range.
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 within
the tolerance.
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. Often,
this expression is also used when the measuring system is adjusted at
the same time (see adjusting).
Measured parameter
The measured parameter is the physical dimension determined by
measuring, e.g. pH, conductivity or D.O. concentration.
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.
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).
Molality
Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
Reset
Restoring the original condition of all settings of a measuring system.
