Why does the flow rate reading fluctuate excessively on my Seametrics AG3000 Measuring Instruments?
- LLeslie MorrisAug 5, 2025
Excessive fluctuation in the flow rate reading, even when the flow is constant, can stem from several factors. It could be due to turbulent or unsteady flow caused by partially closed valves or obstructions. Ensure the pipe is full, possibly by adding back pressure. If you're combining multiple upstream flow sources, it may cause pulsing flow; try moving the connection point further upstream. Insufficient mixing of upstream chemicals can also be a factor, so move chemical injection downstream from the meter. Low fluid conductivity (less than 20 µS/cm) may require a different type of meter. Electrical noise or a defective AC switching power supply can also cause fluctuations; improve grounding, increase distance from noise sources, or replace the power supply.