Can a turbidimeter be "zeroed out?"

Document ID

Document ID TE4396


Version 3.0


Status Published

Published Date

Published Date 03/21/2019
Can a turbidimeter be "zeroed out?"
Turbidimeter be zeroed out
Stray light affects cannot be "zeroed out." Some manufacturers attempt to do this with procedures using "turbidity-free water" where the output is adjusted to change this reading to zero. In doing this however, several important factors are sometimes overlooked.

First, water will always have particles, no matter how it is treated or filtered. In addition, molecules themselves scatter light. Molecular scattering and the presence of ultra-small particles contribute to the turbidity of every aqueous solution.

Another factor is the set of variables that are introduced when more than one sample cell is used when "zeroing." A second sample cell will increase the stray light and may try to overcompensate the difference if "zeroing" is attempted.

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