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Participant

Join Date: Oct 2016
Posts: 1

Flow Meter Selection

10/08/2016 9:57 PM

I'm trying to select a flow meter for a very specific application and could use some direction/suggestions. Below is a list of specifications and ranges I'm looking for:

  • Small in overall size
  • Able to measure low viscous fluids (water to light oil)
  • Sanitary/Food Grade
  • Low flow application (0.25-0.5 gpm)
  • Accurate at low pressures
  • No power required to operate (Positive displacement maybe?)
  • Works in a vertically mounted position
  • Accurate without additional straight lengths before or after
  • Pulse output

I'm very new to the instrumentation world, as you can probably tell by my above list. Any help or direction will be greatly appreciated. Thank you.

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Guru

Join Date: Oct 2008
Posts: 40046
Good Answers: 1599
#1

Re: Flow Meter Selection

10/08/2016 10:41 PM

Go here: Products & Suppliers.

Select three or more suppliers of flow meters.

Send your list of requirements to all of them.

They will tell you what they have to offer that will best suit your needs.

You need to learn how to research this equipment without asking strangers to do it for you.

Suppliers are the best source for this type of information.

Forum members will tell you what they THINK is best, usually because that's what they were sold and are using.

Good luck.

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Guru
Australia - Member - New Member

Join Date: Feb 2008
Location: Australia
Posts: 1746
Good Answers: 203
#2

Re: Flow Meter Selection

10/09/2016 7:39 AM

Ask the professionals who make thousands of these per year.

While studdying for my degree, I was employed manufacturing "flowmeters" with 4mm tube diameter that were medically implantable to measure flow in the corronary artery of the heart. These were "doppler" style by choice since we already had an elecromagnetic flowmeter on the aorta feeding blood to the whole body. We were also measuring "impedance" of the chest cavity to monitor total instantaneous blood volume in that space.

Needed to use different monitoring signals to eliminate potential cross-talk between signals.

Spare time in the lab was spent building pacemakers etc. Fun times!

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Guru

Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
Posts: 2532
Good Answers: 76
#3

Re: Flow Meter Selection

10/09/2016 5:41 PM

Yes, I can. You need to be on the phone to various instrumentation equipment suppliers from here onwards, to get quotes. I could do it for you, but that might make you lazy, and we don't want that, do we?

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Engineering Fields - Instrumentation Engineering - EE from the the Wilds of Pa.

Join Date: Feb 2006
Location: middle of nowhere, Pennsylvania
Posts: 2509
Good Answers: 59
#4

Re: Flow Meter Selection

10/10/2016 7:44 AM

In my job, I work with flow meters regularly, and was with you until I hit that "no power" requirement. Unless you mean no power except 4-20ma loop power, you have a tough requirement, especially with a pulse output. I agree with all the other posts - talk to a flow meter company, or their representative.

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