Inline Color Photometer Model COLORsmart-AD


The COLORsmart process photometer measures the color of liquids in process pipes.

What does Color mean

In physics, light is regarded as electromagnetic waves.
Color is a sensory perception triggered by light and mediated by the eye.
Color is not a clearly defined quantity such as temperature or pressure, but a subjective impression.

What causes Color

A color sensation occurs when electromagnetic waves from the visible range (wavelengths of approx. 380nm – 750nm) hit the eye.

How Color is created

White light (colorless) consists of the sum of all colors of the visible spectrum. If specific wavelength ranges within this spectrum are absorbed, a color impression is created for the eye.

Measuring Principle:

Solids (turbidity) absorb light in the same way as color.
As solids absorb over the entire light spectrum, absorption is usually measured at two different wavelengths when measuring color. Color absorbs in parts of the visible spectrum, solid particles absorb over the entire spectrum.

Measuring channel detects the absorption caused by color and solid particles.
Reference channel detects the absorption caused by solids only.
Difference between the two signals gives the color concentration.

Color Fotometer COLORsmart
Sensor Color Photometer Model COLORsmart-AD

Features of the measuring system:

Low maintenance / long service life:
– Simultaneous measurement of absorbance at two different wavelengths enables precise measurements 

– compensates for the effects of turbidity, window contamination, lamp ageing, …
Calibration / maintenance interval typically 12 months (depending on application):
– As a rule, calibration and maintenance are required every 12 months.
– However, the maintenance interval depends on the measuring range and application.
Light source LED array

– Long-life LED technology (approx. 5 years service life)
Material Measuring cell typically POM
The measuring cell is made of POM, optionally stainless steel 1.4404 / 316L, Peek, TFM PTFE, titanium, ….
Material seals: FKM:
– The seals are made of FKM.
– Seals made of other materials such as EPDM, FFKM or silicone are optionally available.
Process connections: DIN flanges, ANSI flanges, NPT, …:
– Various connection options for different process requirements.
Measuring range span: 0 – 0.1 AU up to 0 – 5 AU:
– The measuring range extends from 0 to 0.1 absorption units up to 0 – 5 absorption units.
Configurable for measurement of:
– APHA / ASTM / EBC / ppm /mg/l / g/l / % / AU / CU / OD / …