Siemens MAG 5100 W Instructions page 4

SITRANS F M MAG 5100 W Electromagnetic flowmeter
Installation, general
(continued)
4
Installation in horizontal pipes
The sensor must be mounted as shown in the
upper figure. Do not mount the sensor as shown
in the lower figure. This will position the elec-
trodes at the top where there is possibility for air
bubbles and at the bottom where there is pos-
sibility for mud, sludge, sand etc.
If using empty pipe detection the sensor can be
tilted 45°, as shown in the upper figure.
Measuring abrasive liquids and liquids con-
taining particles
Recommended installation is in a vertical/in-
clined pipe to minimize the wear and deposits
in the sensor.
Inlet and outlet conditions
To achieve accurate flow measurement it is
essential to have straight lengths of inlet and
outlet pipes and a certain distance between
pumps and valves.
It is also important to centre the flowmeter in
relation to pipe flanges and gaskets.
Installation in large pipes
The flowmeter can be installed between two
reducers (e.g. DIN 28545). Assuming that at 8°
the following pressure drop curve applies. The
curves are applicable to water.
Example:
A flow velocity of 3 m/s (V) in a sensor with a
diameter reduction from DN 100 to DN 80
(d /d = 0.8) gives a pressure drop of 2.9 mbar.
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