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.

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