Xylem Oxi 1970i PORTABLE DISSOLVED OXYGEN METERS User Manual
Page 61
Oxi 1970i
Lists
61
Glossary
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 with-
in the tolerance.
Amperometry
Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the sensor is the electric current. The electrical
voltage remains constant.
AutoRange
Name of the automatic selection of the measuring range.
AutoRead
WTW name for a function to check the stability of the measured value.
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. Of-
ten, this expression is also used when the measuring system is adjust-
ed at the same time (see adjusting).
D. O. partial pressure
Pressure caused by the oxygen in a gas mixture or liquid.
Measured parameter
The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
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).
Measuring system
The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and sensor. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Molality
Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
OxiCal
®
WTW name for a procedure to calibrate D. O. measuring systems in
water vapor saturated air.
Oxygen saturation
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.
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.