Xylem SuSix Turbidity and Suspended Solids Transmitter - Manual (Page 13)

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Turbidity and Suspended Solids Transmitter
EN 5.10 SuSix Manual 1406
Motion in the liquid
The liquid has to remain in motion and mixed. It is possible to achieve this
by constantly circulating the liquid, or by installing the sensor at a place
with a constant flow.
Faulty measurement due to stagnant liquid
As soon as the liquid becomes stagnant, and the suspended solids start
for sedimentation, the sensor does not recognize the suspended solids
anymore. For calibration in a sample bucket it is necessary to stir gently
the liquid, or to constantly move the sensor in order to achieve reliable
measuring results. Observe that you keep the minimum distances from the
bucket walls.