Why can’t I get a stable turbidity measurement?

Document ID

Document ID CO168

Published Date

Published Date 27/02/2019
Why can’t I get a stable turbidity measurement?
Outline several factors that may cause unstable turbidity measurement
Unstable turbidity measurements can be caused by several factors including:
  • sample settling
  • a dirty or scratched measuring cell
  • dust and dirt in the instrument optics 

Variability caused by settling is inherent to the technique.  An instrument with an averaging function can help to mitigate this issue.  A clean cell and instrument are necessary for quality turbidity measurements.  Regular inspection and cleaning of the cell and optics is highly recommended.

You can view some of the Hach Turbidity solutions here:
TL23 Laboratory Turbidimeter
TU5 Laboratory Turbidimeter
2100q Portable Laboratory Turbidimeter