Spectral Absorption Coefficient Measurement (SAC)

SAC 8000 SAC Probe

SAC immersion probe IP 68 with turbidity correction. Measured values can be correlated with COD, BOD or TOC.


  • Cheap measurement of COD, BOD, TOC
  • No reagents required
  • Minimum maintenance
  • Short response time
  • Robust design
  • Automatic self-cleaning possible
  • Measurement can be combined with up to 3 further parameters (NH4, O2, MLSS u. a.)

Water and wastewater can contain a multitude of organic compounds. Many of them absorb UV light. The SAC makes use of this property. The SAC 8000 sends UV light through the sample and detects, how much of it gets absorbed. The higher the amount of UV active compunds in the sample, the weaker the light which reaches the detector.

The ranges of substances which are detected by SAC, COD, BOD and TOC overlap to a major extent. Therefore the other sum parameters can be obtained from the SAC, once the conversion factors have been determined.

The measuring windows carry an anti-fouling coating.

  • Drinking water
  • Surface water
  • Wastewater treatment plants