Measurement Setup - Flow - Siemens SITRANS L Operating Instructions Manual

Figure 4.8
Foam generation
Through the action of filling, stirring and other processes in the vessel, foams which
considerably damp the emitted signals may form on the medium surface.
If foams lead to measurement errors, you should use transmitters with guided radar.
4.4

Measurement setup - Flow

Mounting
In general, the following must be observed while mounting the device:
•
•
•
•
•
Flume
Every flume generates a different level of backwater depending on its type and
version. The specifications of the following flumes are available in the transmitter:
SITRANS LR100
Operating Instructions, 10/2021, 62705-76-01
Agitators
Mounting the transmitter on the upstream or inlet side
Installation in the centre of the flume and vertical to the liquid surface
Distance to the overfall orifice or Venturi flume
Min. distance to the max. height of the orifice or flume for optimum accuracy:
1
250 mm (9.843 in)
Requirements from approvals for flow measurement, e.g. MCERTS
1
At smaller distances the measuring accuracy is reduced, see "Technical data".
Installing/mounting
4.4 Measurement setup - Flow
15