2 fields of application, 3 measuring principle of the uv-vis sensor – YSI NiCaVis 705 IQ User Manual

Page 6

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Overview

NiCaVis 705 IQ

1 - 2

ba75950e01

03/2013

1.2

Fields of application

The NiCaVis 705 IQ

is an online sensor for the on-site determination of

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-VIS sensor

The UV-VIS sensor operates according to the measuring principle of

UV-VIS 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 705 IQ

Outlet

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