Electrodes liquid contact electromagnetic flow meter?

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SUMMARY

This discussion focuses on the feasibility of creating a non-invasive electromagnetic flow meter for measuring potable water flow rates between 0.1 to 20 liters per minute. The original poster questions whether electrodes can be placed outside a 1/2" pipe to detect the electric field without direct contact with the liquid. Participants suggest that while traditional magnetic flow meters require invasive electrodes, alternatives like ultrasonic flow measurement may be viable. Additionally, a reference to a retrofit solution from MyFlowLabs indicates potential for non-invasive technology, though specifics on its operation remain unclear.

PREREQUISITES
  • Understanding of electromagnetic flow meter principles
  • Familiarity with ultrasonic flow measurement techniques
  • Knowledge of fluid dynamics and flow rate calculations
  • Experience with DIY electronics and sensor integration
NEXT STEPS
  • Research the principles of non-invasive electromagnetic flow measurement
  • Explore ultrasonic flow meter design and functionality
  • Investigate the MyFlowLabs retrofit solution for insights on non-invasive technology
  • Learn about integrating sensors with microcontrollers for DIY projects
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and developers interested in fluid measurement technologies, particularly those exploring non-invasive methods for flow measurement in potable water systems.

thomas49th
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Hello,

I'm interested in building a small non-invasive battery powered device that wraps around a pressured 1/2" pipe for measuring potable water.

From https://en.wikipedia.org/wiki/Magnetic_flow_meter
and watching youtube videos, it seems they all use electrodes which contact the liquid (water in my case) to measure the potential difference generated, hence making this an invasive technique. I was wondering if it's possible to just have the electrodes sit outside the pipe and still pick up the electric field?

I'm going to be measured flow rates of 0.1 to 20 litres per minute. Quite low.

If not what are my realistic options? Is ultrasound the only real way to go?

Thanks a lot!
 
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Both magnetic and ultrasonic flow measurements are hard for do,it yourself and commercial units are expensive.

I think that your best choice is to go invasive with a propeller in the stream and a magnetic sensor pickup.
 
Hi,

This thread caught my attention and join PF.

I recently came across https://twitter.com/MyFlowLabs/status/654773131693789184

Apparently it is retrofit (non-invasive). Unsure how they have achieved it, what technology they use and accuracy. It looks 3D printed? so maybe it's a doable hobby project.

Are takers on if they use ultrasonics, or something else? The form factor is small from other ultrasonic systems I've seen.

H.