YSI NiCaVis 701 IQ NI - Manual (Page 6)

Overview
NiCaVis 70x IQ NI
1 - 2 ba76132e01 03/2013
1.2 Fields of application
The NiCaVis 70x IQ NI is an online sensor for the on-site determination
of nitrite, nitrate and carbon sum parameters in waste water treatment
plants.
The range of application comprises control, feedback control and mon-
itoring.
Measuring location
Ultrasound cleaning
system
The ultrasound cleaning system ensures low maintenance and long-
term reliable measurement operation.
The ultrasound source integrated in the sensor excites the measure-
ment windows to produce vibrations in the ultrasound range. The
movement of the surface as a result of this prevents the growth of
pollution in almost all cases and, thus, ensures reliable measured
values during continuous operation.
Compressed air cleaning
(option)
The sensor is designed to be equipped with an additional compressed
air-driven cleaning system, which supports the ultrasound cleaning
system as necessary.
1.3 Measuring principle of the UV sensor
The UV sensor operates according to the measuring principle of UV
spectrometry.
Any substance contained in a measuring solution attenuates a light
beam that penetrates the measuring solution. The attenuation (absor-
bance) of the light beam is measured for different wavelengths. The
wavelength dependent distribution produces the absorbance spec-
trum.
The wavelength range where an absorbance occurs is characteristic of
the substance. The extent of the absorbance depends on the amount
of the substance.
The influence of typical interference matrix variants occurring at munic-
ipal waste water treatment plants can be eliminated by including the
entire absorbance spectrum.
With this measuring principle, measuring does not take place continu-
ously but at intervals.
NiCaVis 701 IQ NI Aeration tank, inlet or outlet
NiCaVis 705 IQ NI Outlet