YSI VisoTurb 700 IQ - Manual (Page 19)

VisoTurb
®
700 IQ (SW) Commissioning
3 - 7 ba76039e01 01/2012
3.3.3 Measurement in pipelines
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).
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).
If deposits occur on the pipe walls, the application offset should be
repeated at regular intervals.
Example:
45 ° pipe installation
The pipe should be straight for a length of min. 50 cm beyond the
installation location. Angled or tapered pipes can cause interference
effects in the case of low turbidity.
Fig. 3-5 Turbidity sensor in the pipe using EBST 700-DU/N flow-thru adapter
Fig. 3-5 shows the installation using the EBST 700-DU/N flow-thru
adapter for installation in a straight pipeline (DN 50). The infrared beam
is parallel to the pipeline axis and points in the opposite direction to the
direction of flow. The marking on the sensor points towards the pipeline
(see Fig. 3-5).
Note
Interferences at the measuring location (see section 3.2.1) may require
special adaptations of the installation. For exceptions to the direction of
flow, see section 3.2.2 F
LOW DIRECTION .
ADA-DF 9
EBST 700-DU/N
ca. 50 cm
straight pipe
Marking aid
in this direction
Swivel nut
Infrared beam
Direction
of flow