magenetic flow meter

There could be several reasons for a noisy flow indication.

• There really is fluctuations in the flow - may be caused by improper installation such as a valve or bend just before the flowmeter. Maybe the flowmeter is close to a pump. Whenever possible, I try to have at least 30 diameters of straight pipe before a flowmeter, no matter what type it is.
• You have a partial clog in the pipe
• Your flowmeter's power supply has noise in it
• Your flowmeter is improperly grounded
• Your signal cable is running close to a high power cable - variable frequency drives are especially bad for analog signal cables.
• Your pipe is vibrating
• If you have flow control loop, your PID settings are probably too sensitive for flow. The control valve may be always over-correcting
• Your flowmeter may be defective.

regards,

Vulcan