Xylem NiCaVis 705 IQ, Operating Manual, Page: 56 / 58

Appendix: Glossary
NiCaVis 705 IQ
56 ba75953e03 05/2017
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.
Sample matrix Composition of the test sample of different individual substances.
Test sample Designation of the test sample ready to be measured.
Ultrapure water (H2O
dist.)
Ultrapure water is distilled or deionized water suitable for analysis
purposes.
Zero adjustment Measuring and saving the absorbance spectrum of ultrapure water.
Defines the zero points in the spectrum for all wavelengths. The light
beam is not alleviated at the zero point. The zero point influences the
calculation of the raw value.
TOC Abbreviation for total organic carbon. Total amount of organically
bound carbon in water.
UVT (dissolved) Transmission measurement after turbidity correction
(reference measurement at 550 nm).
UVT (total) Transmission measurement at a certain wavelength.
The UVT-254 value is standardized to 10 mm gap width.