Siemens SITRANS F M MAG 1100 Instructions page 4

SITRANS F M Electromagnetic flowmeter type MAG 1100, DN 2 - DN 100, 1/12" - 4"
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
electrodes at the top where there is possibility
for air bubbles and at the bottom where there
is possibility 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/
inclined pipe to minimize the wear and depos-
its in the sensor.
Avoid vibrations!
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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