Sample Flowrate - ABB 4690 User Manual

4690 Series
Turbidity systems
Dimensions in mm (in)
46.5
(1.83)
Sample Inlet Connector
(12 [0.5] internal
diameter tube)
Fig. 3.9 Sensor Dimensions (Without Optional Wiper Unit)
Fig. 3.10 7998 Series – Sample Outlet Connector Location
IM/4690–EN Rev. A
298.0 (11.7)
155.5 (6.12)
6 x Ø7 (0.3)
mounting holes
Sample Drain
Connector
(12 mm [0.5 in] internal
diameter tube)
Sample Outlet
Connector (6 [0.25]
internal diameter tube)
118.0
(4.65)

3.3.1 Sample Flowrate

Set a minimum flowrate of 0.5 l min
the pipework. Increase the flowrate if necessary but do not
exceed the maximum flow rate of 1.5 l min
When measuring turbidity, it is important that additional sources
of light scattering, such as gas bubbles in the sample, are
eliminated. An optional debubbler (part number 7997 500) is
available to eliminate gas bubbles – refer to Section 3.4,
page 10.
3 Installation
230.0 (9.0)
282.0
(11.1)
-1
to prevent solids settling in
-1
.
9