How to Measure Flow in Partially Filled Pipes Accurately – RBEF-P Electromagnetic Flow Meter

Measuring flow in gravity sewers, storm drains, or industrial effluent lines is challenging because pipes rarely run full. Traditional solutions like weirs, flumes, or siphons require expensive concrete work, take up space, and need constant cleaning.

How to Measure Flow in Partially Filled Pipes Accurately

The RBEF-P Partially Filled Pipe Electromagnetic Flow Meter from R&B Instrument Inc. offers a smarter, cost‑effective alternative.

How it works

It uses the velocity‑area method: an electromagnetic sensor measures flow velocity, and a high‑precision level gauge measures liquid height. The meter then calculates real‑time flow rate and totalized volume. Just input the pipe inner diameter.

Why choose RBEF-P?

- Wide level range – accurate from 10% to 100% full pipe (accuracy ±2.5% FS)

- Triple electrodes at 10%, 30%, and 50% of pipe diameter – the meter automatically uses the best signal above the liquid surface, avoiding oil or floating grease

- No moving parts – unaffected by sand, debris, or bubbles

- Easy installation – standard flange connections (DN100 to DN1200), no civil works

- Multiple outputs – 4‑20mA, pulse, RS485 (Modbus RTU)

Typical applications

- Municipal rainwater and sewage

- Wastewater treatment plant influent/effluent

- Combined sewer overflows (CSO) and storm water overflows (SWO)

- Industrial wastewater collection and return flows

- Irrigation water measurement

Stop relying on expensive flumes and siphons. Upgrade to a reliable, low‑maintenance flow meter designed for partially filled pipes.

Contact R&B Instrument Inc. for a quote or engineering support.

*Keywords: partially filled pipe flow meter, open channel electromagnetic flow meter, wastewater flow measurement, velocity area method, RBEF-P