Hello everyone,

I have a Sitrans FM Mag 5000 installed at a site, and I'm encountering an issue with fluctuating flow values. Initially, the flowmeter showed fluctuating readings, so I checked the wiring and re-terminated it. After doing so, the flow value became stable at 13 m³/h, which seemed fine at first.

However, I was informed that there should be no flow in the pipe, which made me question the reading of 13 m³/h, as there shouldn’t be any flow if the pipe is indeed empty. After some hours, I revisited the flowmeter and noticed that the flow values started fluctuating again.

Has anyone encountered a similar issue with the Sitrans FM Mag 5000? Could this be a wiring issue, or is there a possible explanation for the flowmeter showing a flow rate despite no actual flow? Any insights or suggestions on what could be causing this fluctuation would be greatly appreciated!

Looking forward to hearing your thoughts and experiences.

Thank you in advance!

danw

download the Mag5000 manual

https://support.industry.siemens.com/cs/de/en/view/85671888

Read the sections on "Indicates flow with no flow in pipe" and "Unstable flow signal" on page 63 pdf.

Thank you, Danw, for your response!

Just to clarify, the issue I'm encountering is that the value shown on the flowmeter display is fluctuating. After reading the manual, I believe the "Unstable flow signal" refers to the signal output rather than the display itself.