Siemens SITRANS F M MAGFLO Instructions page 5

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SITRANS F M MAGFLO
Cathodic protected piping
Earting flanges
For PTFE liner
For PFA liner
Electromagnetic flowmeter type MAG 3100 with PTFE or PFA liner
Special attention must be given to systems
with cathodic protection.
By compact mounting:
The transmitter must be supplied through an
isolation transformer. The terminal "PE" must
never be connected.
By remote mounting:
The screen must only be connected at the
sensor end via a 1.5 μF condensator. The
screen must never be connected at both ends.
By isolated sensor:
If above mentioned connections are unac-
ceptable, the sensor must be isolated from the
pipe work.
Where necessary on non conductive pipes,
mount earthing flanges type E.
For potential equalization one earthing flange
is sufficient even for bidirectional flow. With
unidirectional flow the earthing flange should
be mounted on the inlet side.
In special cases with abrasive flow the earthing
flanges will also work as inlet protection.
High temperature sensors are delivered with
two factory mounted earthing flanges. No fur-
ther action need to be taken for potential equali-
sation.
Earthing flanges must be connected to the
meter body with the enclosed earthing straps.
Where necessary on non conductive pipes,
mount flat earthing rings.
For potential equalization one earthing ring is
sufficient even for bidirectional flow. With uni-
directional flow the earthing ring should be
mounted on the inlet side.
In special cases with abrasive flow the earthing
ring will also work as inlet protection.
Earthing rings must be connected to the meter
body with the enclosed earthing straps.
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