how to make incline manometer

[td99]

Hi guys i was hoping to get some help here. iv got my flow bench pretty much done except for making the incline manometer. i know that its not linear but i am unsure how to determine where the diff. percentage marks go. (the manometer is 29 in. long)i have a chart that shows changes in inches. for instance 28" is equal to 100%. it gives the changes in inches for every percentage point but 5% is equal to .07" how am i supposed to measure and mark that. the design for the manometer is based off the one used on the msd style flow bench if that helps.

Cody

[Erland Cox]

You have to get a calibration plate and test. The incline manometer is a square root scale. I use a 1 meter scale and use the mm:s as that is much easier than using inches. So 100 mm is the square root of 100 or 10. 1000 mm is 31,6. I have a weather calibration that i do each time I do a test: the square root of (( Temp in Kelvin / pressure in hPa ) X inclination height in meters ). Then I have a flow constant numberthat I multiply that with. I use a pitot tube and my total flow constant is somewhere around 11.25. So the square root of the inclined manometer X 11.25 is the flow in CFM on my bench. I use 300mm or 0.3 meters of inclination. Hope that this helped a little. Erland.

[coulterracn]

Try the flowbench forum and download the excel spreadsheet to calculate your Manometer and orifice.
http://www.tractorsport.com/cgi-bin/for ... ;f=17;t=34

[pdq67]

Please, DON'T use mercury b/c if it break's your place could turn into an EPA Superfund site regarding clean-up!

You won't have enough money to clean up the mess!

Just a little ditty as JCM would say to tell you how it can turn out.

There was a guy in the Dakota's that had a meat locker and had 85,000 pounds of Buffalo in it. Well he went broke, and the meat rotted and turned into a mess!

Anyway, he worked with the little town he was in and everybody got it cleaned up and the bill came to something like $13,000 or so.

UNTIL EPA got into it and they billed him for $4,000,000 for them doing NOTHING.. I figure this is just a case of our beloved GOV wanting his LAND/PROPERTY!!!
pdq67