Wastewater Flow Meter

An electromagnetic wastewater flow meter measures volumetric flow by Faraday’s law of electromagnetic induction. A pair of magnetic-field coils generates a stable field across the pipe bore. As wastewater (with conductivity well above the 5 µS/cm threshold; typical sewage is 500 to 2,000 µS/cm) flows through the field, an EMF is induced across two electrodes, with magnitude directly proportional to the average flow velocity. The induced-EMF method has no moving parts, no orifice edge, and no bluff body in the bore; so it is unaffected by floating solids, fibrous waste, grit, and the partial-fill conditions that retire turbine, vortex, and orifice meters on raw sewage service.

Soft rubber (E code) is the standard for municipal sewage and most industrial wastewater. It tolerates raw sewage solids, weak acid pH 4 to 7, weak alkali pH 8 to 11, and continuous +80 °C with the abrasion resistance that sees a 10-year service life on grit-laden trunks. Hard rubber (D code) is the upgrade for slightly more abrasive service; sand-bearing wastewater from car washes, concrete plant runoff, and similar grit-heavy streams. PTFE (C code) is the upgrade for chemical wastewater outside pH 4 to 11; strong-acid pickle-line waste, oxidizing chemical waste, and any side-stream where rubber would swell or degrade.

The meter measures the average velocity across the full pipe cross-section directly through the induced EMF; not a single-point sample like vortex or a pressure-differential calculation like orifice. Velocity-profile asymmetry from elbows, valves, or reducers does not significantly change the cross-sectional average, so the straight-pipe rule is short: 5D upstream and 2D downstream. This is the key advantage on retrofit installations in lift stations, treatment-plant chambers, and underground vaults where pipe length is constrained; the meter drops into existing skids that vortex (10D / 5D) and orifice (20D / 5D) meters cannot fit.

The LEA performs accurate measurement when the meter bore is fully flooded. For partial-fill conditions, the empty-pipe detection circuit triggers the meter to pause totalizing; preventing false low-velocity readings from being added to the daily total. For chronic partial-fill conditions on gravity-flow sewer mains, the standard remediation is to install the meter on the discharge side of a pump or in a sump chamber where the pipe is fully wetted; the lift-station discharge use case is the canonical fully-flooded wastewater install.

Specify the IP68 sensor + IP65 converter combination at order for any wastewater installation where the sensor sees groundwater intrusion, valve-chamber flooding, lift-station submergence, or sustained high humidity. The IP68 sensor head with hermetic potting handles continuous submerged service to 10 m water depth. The remote-mount converter housing stays at IP65 above grade for technician access; the cabling between the two is supplied at the order length to match the burial depth.

Yes; the LEA totalizes forward and reverse flow as separate registers with direction indication on the local display and Modbus output. For storm-overflow chambers and bypass-loop installations where flow can reverse during high-rainfall events, the bi-directional totalizer captures both the normal-flow volume and the reverse-flow volume separately, supporting overflow-permit reporting and SSO (sanitary sewer overflow) event reconciliation against the discharge permit.

Standard lead time is 5–7 business days from order confirmation, factory direct. EMC compliance to the EU Electromagnetic Compatibility Directive 2014/30/EU (Annex II) ships as standard. IP65, IP67, and IP68 sensor + IP65 converter ingress ratings are selectable at order. Ex d hazardous-area certification is available for digester-feed and biogas-adjacent wastewater service.