Expert’s answer: Magmeter

If you look in a manual for a Siemens flow meter, you’ll see a list of installation requirements. So there are magmeter requirements. The SITRANS flow meter requires five times the diameter before the device and three times the diameter after.

Although some magmeters can work without inlet and outlet runs, you’ll lose accuracy. Unfortunately, sometimes the manuals omit this information. If you have a device for mass flow measurement, either set the density on the device or have a density meter sending that data for the mass calculation.


Typically, when you have a simple installation, the company won’t have an online device responsible for density measurement. That means your application might not turn out as accurate as you want. If your meter requires an inlet and outlet run that you don’t have, you have a new place for errors to occur.

These companies have magmeters on the market:

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