Water & Wastewater instrumentation
Water and wastewater plants measure flow at inlet, process and outlet; level in wet wells, clarifiers and reservoirs; and pH, ORP, dissolved oxygen and turbidity for process control and discharge compliance. Supmea's core set is the LDG electromagnetic flow meter, WSR201 radar and SUP-MP ultrasonic level, SUP-PH6.5 pH/ORP and SUP-DM2800 DO analyzers.
The measurement challenge
Utilities buy instruments for a long life in wet, buried and corrosive locations, and for data that holds up in a compliance report. That favours instruments with no moving parts, IP68 options and simple Modbus integration into SCADA.
Supmea electromagnetic flow meters hold NSF certification for drinking water use (announced in 2025), which matters for potable-water contact in North American projects.
- Buried and flooded meter pits need remote-type IP68 converters.
- Raw sewage and sludge carry rags and grit, so use full-bore meters with no obstruction.
- Aeration is the largest energy load, and DO control directly cuts blower energy.
- Discharge permits require reliable pH and flow records.
Measurement points and recommended instruments
| Point | Variable | Instrument | Why |
|---|---|---|---|
| Plant inlet and outlet flow | Flow | LDG-SUP-A100 Electromagnetic Flow Meter | Full bore, no pressure loss, IP68 remote option |
| Wet well and lift station level | Level | SUP-MP Ultrasonic Level Transmitter | Low-cost non-contact level with pump relays |
| Clarifier and reservoir level | Level | WSR201 60 GHz Radar Level Meter | Unaffected by rain, wind, mist |
| Aeration DO | Analysis | SUP-DM2800 Dissolved Oxygen Meter | Setpoint control for blowers |
| Neutralisation and effluent pH | Analysis | SUP-PH6.5 Online pH/ORP Meter | Dosing relays and isolated 4–20 mA |
| Aeration air flow | Flow | SUP-MF Thermal Gas Mass Flow Meter | Air mass flow per drop leg |
Closing the aeration control loop
Pairing a DO analyzer in each aeration zone with a thermal air flow meter on each drop leg lets the control system distribute air by demand instead of running blowers at fixed output. US EPA guidance on energy efficiency for water utilities identifies aeration as the main target.
Compliance data
Discharge permits under programmes such as the US NPDES rely on effluent flow and quality records. Use analyzers with Modbus or 4–20 mA into a logging SCADA, and document calibration. See how often to calibrate pH sensors.
Frequently asked questions
Which flow meter is standard for wastewater?
The electromagnetic flow meter. It has no obstruction for solids and no moving parts, and handles sludge with a suitable liner.
Radar or ultrasonic for a wet well?
Ultrasonic is usually adequate and cheaper; choose radar where foam, condensation or temperature swings affect echoes.
Instruments for water & wastewater
Electromagnetic Flow Meter
Conductive liquids from DN10 to DN1000 with no moving parts and no pressure loss.
Ultrasonic Level Transmitter
Economical non-contact level for water tanks, sumps and channels.
60 GHz Radar Level Meter
Non-contact level for tanks and open water, ±5 mm with a 6° beam.
Dissolved Oxygen Meter
DO control for aeration basins and aquaculture, 0–20 mg/L.
Online pH/ORP Meter
Panel-mount pH/ORP control with isolated 4–20 mA and dosing relays.
Thermal Gas Mass Flow Meter
Direct gas mass flow in large ducts and pipes, no T/P compensation needed.
Plan the instrumentation for your water & wastewater project
Send the medium, pipe size, flow or level range, temperature, pressure and required output. You'll get a recommended model, the datasheet and a quotation.
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