Electromagnetic flowmeters
Electromagnetic flowmeters
(OP)
Hello
I have to install flowmeters in PPE pipes for measuring the flow of HCl(hydrochloric acid) 35%. Should i install the grounding rings as the manufacturer suggest? And also what is the straight unimpeded run at the inlet of the flow sensor? The manufacturer suggest 5xD (sensor diameter). Thanks in advance for your time.
I have to install flowmeters in PPE pipes for measuring the flow of HCl(hydrochloric acid) 35%. Should i install the grounding rings as the manufacturer suggest? And also what is the straight unimpeded run at the inlet of the flow sensor? The manufacturer suggest 5xD (sensor diameter). Thanks in advance for your time.





RE: Electromagnetic flowmeters
m777182
RE: Electromagnetic flowmeters
I suppose that the rings are for achieving the same potential between inlet and outlet of the plastic pipes but i was waiting for a justification.
RE: Electromagnetic flowmeters
RE: Electromagnetic flowmeters
No. It is not possible when there is a (conductive) liquid in the pipe. The plastic will stay close to the liquid's potential. It is more about keeping the liquid itself on a quiet (ground) potential. A potential of a few 100 millivolts would be just as bad, considering the low signal level.
The rings couls be called "guard rings" and they are there to keep any electric field or field gradients away from the neasuring system.
Gunnar Englund
www.gke.org
RE: Electromagnetic flowmeters