Siemens SITRANS F M MAG 1100 Instructions page 5

SITRANS F M Electromagnetic flowmeter type MAG 1100, DN 2 - DN 100, 1/12" - 4"
Installation, general
(continued)
Potential equalization
To obtain optimum results from the measuring system the sensor's chassis point/housing must
have the same electrical potential as the liquid being measured.
Depending on the type of gasket selected (graphite, EPDM or PTFE) and application, this can
be achieved as follows:
Electrically
conductive
piping
A: Potential equalization with electri-
cally conductive graphite gaskets
Electrically
non-conductive
piping
C: Potential equalization with electri-
cally conductive graphite gaskets
The sensors DN 2, 3, 6 and DN 10 can also be mounted between two adapter flanges. In this
way the potential equalization with the liquid occurs automatically.
NOTE:
Special attention must be paid to piping systems with cathodic protection.
See SITRANS F M handbook.
Graphite gaskets
For applications where high accuracy is
required, it will be advantageous to use
recessed flanges as shown in the drawing.
NB
To obtain optimum measuring accuracy and
the necessary tightness, it is important that the
sensor gaskets and the flange centre lines are
merging and that the connection flanges have
been mounted at right angles to the pipe.
The connection flanges must be parallel.
EPDM or PTFE gaskets
B: Potential equalization using earth
strap supplied.
D: Potential equalization using sepa-
rate potential equalization ring
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