Is the LGF-PA66 magnetic flow meter suitable for wastewater treatment plants? How to select it for influent and return sludge duties?

Plant influent carries fibrous debris and return sludge is concentrated and abrasive, so the LGF-PA66 should be specified separately for each process duty.

• Influent and lift stations: the medium contains large solids, so specify abrasion-resistant rubber lining with 316L electrodes. Wastewater conductivity is typically above 500μS/cm, making magnetic metering more stable than ultrasonic. Sizes of DN300–DN800 are common; install where the pipe runs full, clear of the turbulent drop zone at headworks weirs.
• Return and waste activated sludge: sludge concentrations of 8–15 g/L behave as non-Newtonian fluids; keep line velocity above 1 m/s to prevent deposition. The LGF-PA66 has no obstruction and no moving parts, so it cannot foul or jam like a vortex or turbine meter. Choose hardened-alloy electrodes for abrasion resistance, and scraper-type electrodes where sludge wear is severe.
• Effluent metering: where effluent is used for billing or discharge totalisation, select the ±0.5% accuracy class and submit the meter for periodic verification per the applicable regulation.

For sludge duties, set up an electrode-fouling inspection routine and use the transmitter's coating alarm to catch build-up early — far cheaper than pulling the meter for cleaning after the fact. Small chemical dosing points are covered by DN15–DN50 LGF-PA66 units.

For more information, please visit our product pages or contact our technical team.