wtw Oxi 315i Operating Manual page 33

Oxi 315i
Adjusting
AutoRange
AutoRead
Calibration
D. O. partial pressure
Measured parameter
Measured value
Measuring system
OxiCal
Oxygen saturation
Reset
Resolution
Salinity
Salt content
Sample
Slope
Glossary
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 with-
in the tolerance.
Name of the automatic selection of the measuring range.
WTW name for a function to check the stability of the measured value.
Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Of-
ten, this expression is also used when the measuring system is adjust-
ed at the same time (see adjusting).
Pressure caused by the oxygen in a gas mixture or liquid.
The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
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).
The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and probe. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
®
WTW name for a procedure to calibrate D. O. measuring systems in
water vapor saturated air.
Short name for the relative D. O. saturation.
Note: The D. O. saturation value of air-saturated water and the D. O.
saturation value of oxygen-saturated water are different.
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 absolute salinity S
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 is used for oceanographic monitoring. It is deter-
mined by measuring the electrical conductivity.
General designation for the quantity of salt dissolved in water.
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.
of seawater corresponds to the relationship
A
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