YSI VisoTurb 700 IQ - Manual (Page 16)

Commissioning VisoTurb
®
700 IQ (SW)
3 - 4 ba76039e01 01/2012
3.2.5 Distances from the ground and wall
Note
In cases of low turbidity (< 100 FNU), the effect of the measuring
environment can simulate higher turbidity or an increased level of total
suspended solids. The effect of the measurement environment can be
reduced by ensuring the optimum conditions (see section 3.2.1).
The following graphic indicates the minimum distances of the
measurement windows to the ground or wall, which must be observed.
The effect of the distances on the measured value was determined for
various wall materials in the case of a sensor placed vertically to the
wall in drinking water (see drawing).
Fig. 3-3 Effect of ground and wall distances on the turbidity measurement
Note
At low levels of turbidity, a minimum distance of at least 10 cm must be
kept from the ground or wall.
Note
If an optimum installation is not possible due to the structural conditions
at the measuring location (e.g. in narrow pipelines), the effects of the
measurement environment can be compensated by an application
offset (see section 4.2.2).