Insertion type magnetic flowmeter

The signal is measured in exactly the same way as in a conventional magmeter...there is a very low voltage and very low amperage signal induced
on the electrodes by the passage of the conductive fluid through the sensor field.

The difference between a conventional magmeter and every insertion magmeter but one is that a conventional magmeter's field extends from pipewall to pipewall in all directions, and _all_ of the velocity vectors of the moving fluid are components of the signal. In an insertion magmeter, the field is roughly a sphere of 1 cm diameter, located at the tip of the probe.

For all intents and purposes, an insertion magnetic flowmeter has the same inherent accuracy as a paddlewheel flowmeter.

This specifically does not include the Marsh-McBirney MultiMag, which has multiple magnetic sensors and operates very much analogously to a multiple port pitot tube, with magnetic sensors replacing the multiple ports.

Walt Boyes
co-author, _The Consumer Guide to Magnetic Flowmeters_ available from and

---------SPITZER AND BOYES, LLC-------------
"Consulting from the engineer
to the distribution channel"
[email protected]
21118 SE 278th Place
Maple Valley, WA 98038
253-709-5046 cell 425-432-8262 home office

Dipl.-Ing. Klaus Tadday

Klaus from Germany:

Is the author in the position to provide installation details for the flowmeter in question: what are the minimum distances behind valves, bends and the like, the flowmeter can be installed without being negatively influenced by turbulances?