• 20.07.2021
  • WTW, Process Segment

IQ spectral sensors to measure Color continuously

IQ spectral sensors to measure Color continuously

Color has always been an important parameter in water quality. For some years now, the need for continuous measurement has also been increasing. To meet these market demands, we are introducing new color sensors for the IQ Sensor Net.

Applications, methods, measuring principle

Applications

The application areas of the new color sensors are monitoring in the outlet of the sewage treatment plant  and monitoring of surface waters .

Methods

The sensors measure according to the method DIN EN ISO 7887:2011, method C and according to the method APHA 2120 2018 (Hazen), method C. In both cases, these are methods for measurement in the laboratory. In the case of DIN EN ISO 7887:2011, method C, the wavelength of 410 nm is specified. With APHA 2120 2018 (Hazen), method C, the wavelength is freely selectable. In this case, the sensors of the brand WTW offer the wavelengths 340, 350, 390, 445, 455 and 465 nm.

Measuring principle

As with the laboratory methods mentioned above, the sensors determine the measured value with the help of an absorption measurement at the selected wavelength (e.g. 445 nm). The methods demand a filtration of the sample prior to the photometric determination. However, since this is not possible with continuous measurement using a sensor, the influence of the filter residue may have to be compensated in order to achieve better agreement with the laboratory measurement. This is done by means of turbidity compensation.

If turbidity compensation is activated, the absorption of the highest possible wavelength is subtracted from the absorption of the selected wavelength. The result is then converted into mg/l Pt/Co and given as True Color (TC).

If turbidity compensation is not activated, only the absorbance at the selected wavelength is used and converted to mg/l Pt/Co. This is the Apparent Color (AC).

The sensors

Order number Model name Description
481060 NiCaVis® 705 IQ SF Co

Spectral UV-VIS probe to measure Nitrate, Color, CODdiss., TOC, BOD, DOC, SAC and UVT254 in surface waters with integrated ultrasonic cleaning, multifunctional slide and shock-absorption-rings (order SACIQ separately)

481065 CarboVis® 705 IQ TS Co

Spectral UV-VIS probe for measuring color, CODtot, CODdiss., TOC, BOD, DOC, SACtot., SACdiss., UVT254 and TSS in a WWTP drain/outlet with integrated ultrasonic cleaning, multifunctional slide and shock-absorption-rings (order SACIQ separately)

481066 NiCaVis® 705 IQ TS Co

Spectral UV-VIS probe for measuring color, nitrate, CODtot, CODdiss., TOC, BOD, DOC, SACtot., SACdiss. and UVT254 in a WWTP drain/outlet with integrated ultrasonic cleaning, multifunctional slide and shock-absorption-rings (order SACIQ separately)

481067 ColorVis 705 IQ

Spectral UV-VIS probe for measuring color (Hazen 340, 390, 445, 455, 465, ISO 410) with integrated ultrasonic cleaning, multifunctional slide and shock-absorption-rings (order SACIQ separately)

Our benefits

  • Compliant and reliable by using accepted methods (ISO 7887 and Hazen)
  • High accuracy by turbidity compensation
  • Low maintenance due to reagent free sensors with integrated ultrasonic cleaning
  • Long lifetime due to robust sensors
  • all in one solution with all parameters in one system
  • Flexible due to all kind of communication to PLC

To the products

 Read more about the Color sensors to monitor sewage treatment plant outlet

Get information & request your Quote here!


 Read more about the Color sensors to monitor surface waters

Get information & request your Quote here!


Downloads

Download the product flyer of the new Color sensors of the IQ Sensor Net as a pdf (999328US, English, approx. 310 KB)

Download data sheet D2.27 of the new Color sensors for sewage treatment plant outlet monitoring as pdf (999330US, English, approx. 105 KB)

Download data sheet D2.26 of the new Color sensors for surface water monitoring as pdf (999247US, English, approx. 105 KB)

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