Flowmeter scales

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Date

02-12-2008

Posted by steamer on February 27, 2008, 2:20 pm

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--Well there you are; didn't even know if there were other brand
names! A ThomCat search pulls in much irrelevant stuff. Here I got some good
feel for what's best; now I can buy online. Anyone got a favorite web
supplier?

--
"Steamboat Ed" Haas : Don't forget to spay and
Hacking the Trailing Edge! : neuter your politicians...
www.nmpproducts.com
---Decks a-wash in a sea of words---

Posted by BobH on February 26, 2008, 7:38 pm

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steamer wrote:

> --Rats! Hasn't *anyone* got input on where to get a decent flowmeter
> with an expanded scale??
>

A company named Dwyer makes lots of flowmeters for air and such. I think
that you can look up the calibration constants for air and Argon and get
a fudge factor to convert to Argon. Lots of surplus places have Dwyer
stuff - here is one, but it is for much to low flow, 20 CFH is probably
about 60x too low for welding purposes, but look around

http://www.surpluscenter.com/item.asp?UID=2008022618264154&item=20-1473-6&catname=air

Good Luck,
BobH

Posted by Grant Erwin on February 27, 2008, 7:37 am

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BobH wrote:

> steamer wrote:
>

>> --Rats! Hasn't *anyone* got input on where to get a decent flowmeter
>> with an expanded scale??
>>

>
> A company named Dwyer makes lots of flowmeters for air and such. I think
> that you can look up the calibration constants for air and Argon and get
> a fudge factor to convert to Argon. Lots of surplus places have Dwyer
> stuff - here is one, but it is for much to low flow, 20 CFH is probably
> about 60x too low for welding purposes, but look around
>
>

http://www.surpluscenter.com/item.asp?UID=2008022618264154&item=20-1473-6&catname=air

Actually 20 cfh (of C25) is what I nearly always use. Question is what's that
fudge factor ..

Grant

Posted by BobH on February 27, 2008, 8:21 pm

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Grant Erwin wrote:

> BobH wrote:

>> steamer wrote:
>>

>>> --Rats! Hasn't *anyone* got input on where to get a decent flowmeter
>>> with an expanded scale??
>>>

>>
>> A company named Dwyer makes lots of flowmeters for air and such. I
>> think that you can look up the calibration constants for air and Argon
>> and get a fudge factor to convert to Argon. Lots of surplus places
>> have Dwyer stuff - here is one, but it is for much to low flow, 20 CFH
>> is probably about 60x too low for welding purposes, but look around
>>
>>

http://www.surpluscenter.com/item.asp?UID=2008022618264154&item=20-1473-6&catname=air

>
>
> Actually 20 cfh (of C25) is what I nearly always use. Question is what's
> that
> fudge factor ..
>
> Grant

I'd have to look it up. At one time I knew how to calculate it, but I
killed those braincells... I was thinking it was based on molecular
weight, but the difference between Helium and Argon isn't 7X as I remember.

Sorry,
Bob

Posted by BobH on February 27, 2008, 11:12 pm

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Grant Erwin wrote:

> BobH wrote:

>> steamer wrote:
>>

>>> --Rats! Hasn't *anyone* got input on where to get a decent flowmeter
>>> with an expanded scale??
>>>

http://www.surpluscenter.com/item.asp?UID=2008022618264154&item=20-1473-6&catname=air

>
>
> Actually 20 cfh (of C25) is what I nearly always use. Question is what's
> that
> fudge factor ..
>
> Grant

Here are some sites with information on coming up with that fudge factor

http://www.kinginstrumentco.com/correctionformulae/correctionformulae.html#gas

http://www.omega.com/toc_asp/frameset.html?book=Green&file=TECHREF_SECT_B

Omega sells a lot of different kinds of stuff. They are good but expensive.

Ed:
The proper name for the ball type flowmeters is variable area flow
meters or Rotameters. Some vendors are:
Brooks Instruments
Cole Parmer
King
Vogtlin (should be an umlaut on the o but my keyboard and I don't know how)

I used to have a book with the coefficients for many gases, but it is
long gone as I have not worked with that stuff for 20 years.

Bob

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