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AC or DC Power Electromagnetic Flow Meter.

05/31/2011 9:00 AM

Which one between 230 VAC or 24 VDC power electromagnetic flow meter is better ?Both type AC or DC powered electromagnetic flow meter is available in market, and both type of power is available at site, then which one to select & why ?

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#1

Re: AC or DC power electromagnetic flow meter.

05/31/2011 9:25 AM

If there are hazards to personnel involved in the possibility of their working on live parts in the field, then 24VDC is better.

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#7
In reply to #1

Re: AC or DC power electromagnetic flow meter.

06/02/2011 4:08 AM

That's the answer is. It depends on the intrinsic safety of the media to plant. For instance Organic compounds are highly static and not conductive in such case 24V DC turbine flow meter ( this generates pulse output) is used. 230VAC and even 110V AC is also a manufacture practice and is suitable for many media's from Water to ETP as long as it is conductive electromagnetic is preferred.

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#2

Re: AC or DC Power Electromagnetic Flow Meter.

05/31/2011 9:57 AM

There's a difference between the technology used to pulse (excite) the mag coils in the mag tube from the power supplied to operate the magmeter.

I assume the question is about the excitation technology.

For an excellent description and historical overview of AC vs DC pulsed coil excitation, see Mr. Yoder's article:
http://www.flowresearch.com/articles/PDF_Files/FC-1106_JesseYoder.pdf

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#3
In reply to #2

Re: AC or DC Power Electromagnetic Flow Meter.

05/31/2011 10:59 AM

Thanks,good article on this flowsearch link & nice reply.

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#6
In reply to #2

Re: AC or DC Power Electromagnetic Flow Meter.

06/01/2011 12:43 AM

Question seems not related to AC and DC mag meter technology, as now a days almost no manufacturer is using AC excided magmeter.

There are choices in the market ... 230 V AC and 24 V DC , but 230 V AC magmeter is also not using AC excitation, for various technical drawbacks. Even though the power supply is 230 V AC, the technology used is pulsed DC only. Thus 230 V AC power is converted to DC at very first stage of electronic circuitary.

Now about OP's question: Performancewise there is no difference between 230 V AC operated and 24 V DC operated magmeters. Sometimes, 24 V DC are better as there is no 50 Hz noise

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#4

Re: AC or DC Power Electromagnetic Flow Meter.

05/31/2011 4:32 PM

I use 24VDC any time I can, which is every time, unless the customer specifically wants something else. You will yield the same results either way, but you won't get bit with 24VDC like you do with 110VAC.

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#5

Re: AC or DC Power Electromagnetic Flow Meter.

05/31/2011 11:07 PM

Questions:

What is your Liquid - how Conductive-- quantify

Do you need Flowrate Signal Continuously- or periodically would do

How often Sampling needed

Flowrate range 0>>100% is what

All these answered will lead to optimization AC, DC,Pulsed A C,Pulsed D.C.

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#8

Re: AC or DC Power Electromagnetic Flow Meter.

06/24/2011 2:44 AM

The best way to judge which type of electromagnetic flow meters (EMF) is the availability of type of power at site.

In case of DCS controlled environment, generally 24 DC power supply is easily available in the field. So one can take advantage of the same.

Also 24 V DC supply instruments are cheaper than AC power supply instruments so you are sure to get a higher quote for AC types.

Even if there is only AC power supply available, a small 230-to-24V DC adaptor would do the job for you.

So my option is to go with 24V dc type electromagnetic flowmeter.

For in-depth details about the same, you can refer the following link:

http://scharfautomation.com/

Hope that helps.

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