Siemens SITRANS F M MAGFLO Instructions page 3

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SITRANS F M MAGFLO
Installation, general
(continued)
Electromagnetic flowmeter type MAG 3100 with PTFE or PFA liner
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
containing particles
Recommended installation is in a vertical/
inclined pipe to minimize the wear and de-
posits 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.
Pressure drop
The flowmeter can be installed between two
reducers (e.g. DIN 28545). At 8° the follow-
ing 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
1 2
mbar.
3