quick tip.....incline the differential manometer from the vertical to the horizontal and incline by about 5 degrees it'll be much easier to read the small difference....hence it's called an "inclined Manometer"....but you knew that already right
@@enginord yeah i got it, I wanted to ask if the orifice on the side of the tube needs to be same size as the one in the middle. To get a real differential pressure. This popped into my head when i saw the small difference in the differential monometer, also seen others use differential monometer put on incline to make it being read easyer. If you do another one this might help.
@@Einimas OK. I see. the tubes (orifices) for the static and total pressure can be of any size. they don't have to be the the same size. And yeah an oblique manometer is handy for small pressure differences.
Privet Martin. you need to know the velocity and surface area @ the measurement point. Surface area I calculated based on the geometry (m^2). I calculated the velocity based on the dynamic pressure (measured in water mm converted to Pa). You can calculate velocity as: V = sqrt ( (2 * P) / rho) where P is dynamic pressure, rho is air density (kg * m^-3). once you have the velocity and area get their product in (m^3 s^-1) and if you want it in cfm multiply by 2119. hope this helps.
Thanks.. Brother.. I wanna try to build it for my workshop motorcycle
quick tip.....incline the differential manometer from the vertical to the horizontal and incline by about 5 degrees it'll be much easier to read the small difference....hence it's called an "inclined Manometer"....but you knew that already right
Just build a u tune nanometer remember 1inch of water column does not equal 1 linear inch on a vertical manometer.
Just go to Dwyer instruments at Amazon and buy an incline manometer for a reasonable price.
incredible
Only 197 followers?
Hi is the differential tube orephis calibrated? Do they need to be same diameter on both sides?
you need to know the orifice size to 2 decimal for good results i.e. 18.02 mm
@@enginord yeah i got it, I wanted to ask if the orifice on the side of the tube needs to be same size as the one in the middle. To get a real differential pressure. This popped into my head when i saw the small difference in the differential monometer, also seen others use differential monometer put on incline to make it being read easyer. If you do another one this might help.
@@Einimas OK. I see. the tubes (orifices) for the static and total pressure can be of any size. they don't have to be the the same size. And yeah an oblique manometer is handy for small pressure differences.
Hi!
How to calculate cfm?
Privet Martin. you need to know the velocity and surface area @ the measurement point. Surface area I calculated based on the geometry (m^2). I calculated the velocity based on the dynamic pressure (measured in water mm converted to Pa). You can calculate velocity as: V = sqrt ( (2 * P) / rho) where P is dynamic pressure, rho is air density (kg * m^-3). once you have the velocity and area get their product in (m^3 s^-1) and if you want it in cfm multiply by 2119. hope this helps.
@@enginord maybe you have messenger?
WhatsApp?
I want speak to you, I have questions
@@MARTIN_BOGATYREVICH . you can write to me: engin000rd at gmal dot com