Air Flow Measurement

[Stephen Dubovsky]

At 06:15 PM 11/20/96 +0000, you wrote:
>
>-> Ok, so go buy a $90 vane/rotating type meter that is 1-2% accurate
>-> and get a curve for your MAF to linearize it.
>
> I'd love to.  Where can I purchase such a meter?
>            
  Ok, A company called alfa electronics @ 1-800-526-2532 sells meters and
stuff (are ok quality, but not quite as nice as a fluke).  They have 2
anemometers for sale.  Here is the rundown:

AM-402 $89.95
measures: 0.4-30.0m/s, 1.4-108.8km/h, 80-5910ft/min, 0.8-58.3 knots
output: 1mv DC per m/s, km/h, 100ft/min, knots
operation temp: 0-50 C
accuracy: 2% +- 0.1mV  (you obviously need a good meter to keep this accuracy)
size: 4x2x1", sensor head 2.8" diam
power: 9v

AM-4201 $179.95
same as the AM-402 but inlcudes a display
accuracy: 2% +- 1digit

  They also sell other cool stuff like a relitive humidity (RH) gauge for
$89.95 that outputs 1mV per 1% RH. (could help in calibrating those MAF
sensors since humidity changes the specific heat of the air).  Accuracy is
3% +- 1mV.
  If nothing else, call and get the catalog...

Omega also sells an accurate and wide range MAF for ~$800.  Is a little
steep to put in a vehicle, but for calibration purposes...  I think their
web site is www.omega.com  They have GREAT catalogs on
pressure/temp/flow/etc measurement.  Each book describes the principles
involved and the pros/cons of different techniques.  A must have.

SMD
--
Stephen Dubovsky
dubovsky at vt.edu

95 Yamaha FZR600
83 Porsche 911SC
84 Jeep Cherokee