Vortex flow meter testing
How we check vortex flow meter yewflo give a correct out put 4-20 against gas flow in side the vortex

 

Typically, you have the meter shop tested prior to purchase

 

If you cannot send the meter out for proper calibration and adjustment, you can do a quick spot check by using another (known/good) flow meter to compare it against and then simply rescale the output.

I've done this for customers in the past with a clamp-on flow meter to test against.

Not 100% perfect, but it works!