Xylem Magflux Electromagnetic Flow Meter - Manual (Page 20)

20 EN 3.05 MagFlux Manual 1212
Electromagnetic Flow Meter
2. If it becomes necessary to use reducers, the inner angle must not
exceed 7.5°.
The minimum length to keep the angle below 7.5° can be checked by
means of the formula below:
L = (D - d) x 7.63
where "D" is the large diameter and "d" the small diameter of the re-
ducer.
Example: If a flow sensor in dimension DN 80 is mounted downstream
of a 100 mm pipe, the reducer must then have a length of minimum
152,6 mm in order to keep the inner angle below 7,5 °.
3. Flange connections must be assembled concentrically on both the up-
stream and the downstream side. Measuring accuracy will be affected
by turbulence in the liquid from poorly made connections.
Important: Gaskets and grounding rings must also be mounted con-
centrically!
4. The flow sensor should always be filled with liquid. For that reason the
flow sensor must not be mounted at the highest point of the pipe sys-
tem or in free outlets, where gravity could empty or partially empty the
pipe.