Inline- Process Photometer Model MoniSpec-C-AD


The MoniSpec-C-AD 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.

Process- PHotometer MoniSpec-C-AD
Process Photometer model MoniSpec-C-AD
Transmitter for UV- / Vis- / Nir- Photometer Model C1

Measuring of:

  • Hazen Color, APHA Color, Pt-Co Color
  • ASTM 1500 Color, Saybolt Color
  • EBC Color
  • Icumsa / RBU Color
  • General Product Color

Features Process Photometer:

Dual wavelength absorption measurement method:
– 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 24 months (depending by application):
– Less maintenance and longer service life.
– Depending on the process conditions, calibration is usually carried out every 24 months.
Material Measuring cell typically stainless steel 316L / 1.4404 
– The measuring cell is made of stainless steel.
– Other materials such as titanium, Hastelloy, Peek or PTFE are optionally available.
Measuring window: Sapphire:
– Sapphire is used as the window material.
– Other materials such as borosilicate or Plexiglas are optionally available.
Sealing material:
– The seals are made of FKM.
– Optionally, seals made of other materials such as FFKM, EPDM or silicone are 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.
Suitable for use in Ex-Zone I & Ex-Zone II (ATEX-Ex d IIC / T6):
– With the optional Ex- Equippement, the device can be used safely in hazardous areas.
Optional cleaning jets:
– A probe with nozzles for cleaning the measuring cell can be installed as an option.
– The appliance is suitable for automated cleaning in the pipe (CIP).