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RE: Calibration/Verification of Rotameters
It's relatively cheap and easy to calibrate the rotameters to a primary air
flow measurement device such as a Gilibrator electronic bubble meter. The
bubble meter would need an annual factory cal per manufacturer
recommendations. My experience is that the acrylic flow meters (aka
rotameters) such as those manufactured by Dwyer Instruments provide reliable
flow rates for long periods of time provided they are kept clean and are not
subject to abuse. Using this method I would expect you could attain and
demonstrate an accuracy of +/- 5 or 10 percent without much trouble at all.
Dan Hoffman CIH,CSP,CHMM
Pangea Group Inc.
-----Original Message-----
From: dennis.hadlock@srs.gov [mailto:dennis.hadlock@srs.gov]
Sent: Friday, October 06, 2000 1:02 PM
To: Multiple recipients of list
Subject: Calibration/Verification of Rotameters
This is a multipart message in MIME format.
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All,
I would like to know how often you calibrate/verify the rotameters
associated with air sampling equipment at your facility and to what
accuracy. This would be for both installed and mobile air sampling
systems/equipment. We are currently calibrating our rotameters annually
with a +/- 15% accuracy and would like to try and justify a longer
calibration period.
Please respond to me directly unless you feel your response would be
appreciated by the entire list.
Thanks for you help,
Dennis J. Hadlock, RRPT, CHMM
Principal Health Physicist
Westinghouse Savannah River Company
dennis.hadlock@srs.gov
803.208.7173
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<br><font size=2 face="sans-serif">All,</font>
<br>
<br><font size=2 face="sans-serif">I would like to know how often you
calibrate/verify the rotameters associated with air sampling equipment at
your facility and to what accuracy. This would be for both installed
and mobile air sampling systems/equipment. We are currently
calibrating our rotameters annually with a +/- 15% accuracy and would like
to try and justify a longer calibration period.</font>
<br>
<br><font size=2 face="sans-serif">Please respond to me directly unless you
feel your response would be appreciated by the entire list.</font>
<br>
<br><font size=2 face="sans-serif">Thanks for you help,</font>
<br>
<br><font size=2 face="sans-serif">Dennis J. Hadlock, RRPT, CHMM</font>
<br><font size=2 face="sans-serif">Principal Health Physicist</font>
<br><font size=2 face="sans-serif">Westinghouse Savannah River
Company</font>
<br><font size=2 face="sans-serif">dennis.hadlock@srs.gov</font>
<br><font size=2 face="sans-serif">803.208.7173</font>
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