Magmeter requirement

Flow Q&A

I have to install meters in polyphenylene ether pipes to measure the flow of a product that's 35% hydrochloric acid. Should I install grounding rings as the manufacturer suggests? And what is the straight, unimpeded run at the inlet of the flow sensor?

Expert’s answer: Magmeter requirement

The manufacturer has a good reason to suggest grounding rings for its electromagnetic flow meter as a magmeter requirement. When you have non-conductive pipes or abrasive products, magmeters need these rings to reduce electrical noise and improve flow measurement. While you’re at it, make sure your rings match the meter size rather than the pipe size.

Magmeter requirement
Straight pipe – Courtesy of Endress+Hauser

As for your run, you’ll find companies saying that you don’t need inlet and outlet runs, but you may compromise  your accuracy taking this dismissal seriously. For most applications, you should have an inlet run of straight pipe five times as long as the pipe’s diameter and an outlet run of straight pipe three times as long as the pipe’s diameter after the flow meter.

Have a look at some of the best options on the market:

Other resources that might interest you

How to do a magmeter check for a magnetic flow meter?
My magnetic flow meter seems to have stopped working. It gives an incorrect reading. What can I check to figure out what the problem is?

The best flow meter: What you need to know
What’s the best magmeter? I have a simple application and I am looking for the best flow meter for my application, could you help me?

Problems when installing magnetic flow meter?
What kind of problems should we take into account- we’re cutting a concrete sewer pipe and installing a flow meter that’s suitable for partially filled pipes. And do we need earthing rings?

Rosemount magnetic flow meter 8712 – low flow cutoff

Our magmeter is measuring without flow. So, I need to change our cutoff value. But how can I change the low flow cutoff on a Rosemount magnetic flow meter 8712?

Related tags: ABB Electromagnetic Emerson Process Management Endress+Hauser flow measurement grounding disc Inlet and outlet run Magmeter magnetic flow meter Siemens
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