I was working on calibrating turbidity transmitters endress+hauser at effluen

I was working on calibrating turbidity transmitters
endress+hauser at effluent polishing plant.We calibrated
using NTU buffers.What happened is that when we immersed
the sensor, everytime we raise and lower the sensor
gradually, the reading will vary.my question is that is
there any specifications on what is the required distance
from the bottom of the container with buffer to the face of
the sensor?Is it ok to install the sensor in a medium which
has turbulence specially if bubbles are present?

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