Xylem wtw NitraVis 705 IQ, Operating Manual

Page: 52 / 56

Appendix: Glossary
NitraVis 70x IQ
52 ba75951e03 05/2017
10 Appendix: Glossary
Absorbance (Absorp -
tion)
Attenuation of the light beam when it penetrates the sample.
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).
Calibration value pair Value pair consisting of the raw value measured by the
NitraVis 70x IQ sensor, and a reference value measured e.g. by a
laboratory determination. The calibration value pairs are the result of
the user calibration.
Concentration Mass or amount of a dissolved substance per volume, e. g. in g/L or
mol/L.
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).
The measured value is determined from the raw value taking into
account the data from a user calibration. The measured value is
displayed together with the raw value in the measured value display.
Measuring gap The measuring gap is between the two measurement windows. In the
measuring gap, the light beam penetrates the test sample.
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 box and armature.
NO2-N The proportion of nitrogen coming from nitrite.
NO3-N The proportion of nitrogen coming from nitrate.
Raw value The raw value is determined from the spectrum while taking into
account the data from the zero adjustment. The raw value is displayed
on the right side of the measured value in the measured value display.
Reference sample Random sample of the test sample for comparative chemical-analyt -
ical laboratory analyses intended for user calibration.
Resolution Smallest difference between two measured values that can be
displayed by a meter.