Are you grounding your magmeters properly?

As I travel around to different manufacturing and water/wastewater plants, I find that nearly half on the magmeter installations that include grounding rings are NOT properly grounded.

The correct thing to do is tie the grounding rings to the MAGMETER body, not to an earth ground.

People often confuse magmeter grounding with an electrical ground for an instrument. This is different. A magmeter works based on Faraday's law; pass a conductive material through a magnetic field and it will create a voltage. The greater the velocity, the higher the voltage. When stray voltages enter the magmeter body, they are measured as flow by the meter. When we tie the grounding ring to the meter BODY (or grounding lugs on some models), we eliminate the effect of the stray voltages form the measuring circuit and measure only voltages caused but the actual flowing media.