Here are a few commercial flow meters that are on the low end of the cost scale (but still not that cheap).
If you find something better, please let me know.
Venturi with Target | |
www.watermeters.com -- home of the dlj meter
|
![]() (thanks to Chuck for suggesting this) |
Sources:
www.kingsolar.com
www.Omega.com
http://www.dwyer-inst.com |
![]() Moderate pressure drop. Some models can handle the full temperature and pressure range encountered in solar thermal projects. $75 and up -- over $200 for full temperature and pressure capability. |
Sources:
www.Omega.com
http://www.dwyer-inst.com
|
![]() ![]() High operating temperature and pressure capability. Moderate to high internal pressure drop. Mount in any orientation. $65 and up |
Paddle Wheel
Meters
http://www.gemssensors.com/TOCproducts.asp
http://www.dwyer-inst.com
|
![]() Some models can handle the full range of solar thermal temperatures and pressures. $150 and up -- maybe the cheapest flow meters with electronic output? |
Clamp on Flow
Meter
|
![]() $50 -- up to 120F. |