Xylem IQ SensorNet ViSolid 700 IQ (SW) - Manual (Page 17)

ViSolid
®
700 IQ (SW) Commissioning
3 - 5 ba76040e02 07/2013
3.3.5 Distances from the ground and wall
Note
If there is a low level of total suspended solids (< 2000 mg/l SiO2 or
< 1000 mg/l TSS), the effects of the measurement environment can
simulate a higher content of total suspended solids. The effect of the
measurement environment can be reduced by ensuring the optimum
conditions (see section 3.3.1).
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 has been
determined for various wall materials (aluminum, black plastic) in the
case of a sensor placed vertically to the wall in drinking water or water
with 1000 mg/l SiO2.
Fig. 3-3 Effect of ground and wall distances on the measurement of TSS
Note
At low levels of total suspended solids, 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 user calibration
(see section 4.2.4).
Pretended
additional amount of
total suspended solids [1000 mg/l SiO2]
Distance x [cm]
2.0
0,9
1.6
0,7
1.2
0,5
0.8
0,3
0.4
0,1
0
0 4 8 12 16 20 24 28 32 36 40
Aluminium (in drinking water each)
x
Aluminium (in water with 1000 mg/l SiO2)
Black plastic material