ENGINEERING DECISIONS
Engineering logic for this condition
Characterise the water and operating cycle. Identify suspended solids, rags, fibres, grease, bubbles, foam, sediment, chemicals, conductivity, density and seasonal variation. Provide normal and storm flow, pump start and stop levels, surcharge, empty state and possible flooding. A wet well, open channel and pressurised full pipe are different hydraulic problems and should not share an unexamined sensing or conversion assumption.
Match the principle to geometry and fouling. Hydrostatic level depends on density and vent integrity; non-contact radar needs a useful echo path clear of inlet streams and structures. Open-channel flow requires a defined weir, flume or area-velocity method and corresponding hydraulic conditions. Closed-pipe electromagnetic measurement requires conductive liquid and a full pipe. Entrained air, partial filling, deposits and distorted profiles can affect the result.
Make maintenance part of the design. Show how a sensor is isolated, lifted, cleaned, inspected or replaced without unsafe entry. State cable distance, condensation, sunlight, lightning environment, submergence and telemetry needs. Commission across representative pump or flow states and record zero, span, geometry and configured conversion. Any ingress, hazardous-gas or reporting claim must match the exact product and project evidence.
Selection inputs and technical route
- Wastewater condition
- Solids, fibres, grease, bubbles, foam, sediment, chemicals, conductivity, density and seasonal change.
- Hydraulic envelope
- Dry, minimum, normal, peak, surcharge and flood states plus pump or aeration cycles.
- Structure geometry
- Pipe, channel, weir, flume, wet-well or tank dimensions, inlets, obstructions and mounting point.
- Environment and communications
- Submergence, condensation, sunlight, lightning, cable length, power, telemetry and site access.
- Maintenance and evidence
- Cleaning, removal, isolation, calibration, reporting purpose and required configuration records.
Applications for engineering review
- Wet-well level control where inlet turbulence, foam, pump cycling, sediment and lifting access are known.
- Full-pipe treatment or discharge flow where conductivity, bore, air, upstream disturbances and low flow are documented.
- Open-channel monitoring where the primary structure, upstream hydraulics, level location and conversion method are defined.
Limitations and confirmation points
- Heavy buildup, entrained air, partial pipes and changing sludge density can invalidate common ideal-flow or hydrostatic assumptions.
- This guide does not establish environmental-reporting compliance or safe confined-space entry procedures.
APPLICATION RFQ
Information to send for configuration review
- Measurement variable and control or reporting purpose
- Wastewater, solids, fibres, grease, foam and bubbles
- Minimum, normal, peak, empty and flood states
- Pump and aeration operating cycles
- Pipe, channel, wet-well or tank drawing
- Conductivity, density and seasonal variation
- Mounting, cable, power and telemetry arrangement
- Cleaning, lifting, isolation and inspection method
- Environment, submergence and area classification
- Quantity and required calibration or reporting records
PRODUCT FAMILIES
Related product categories
APPLICATION FAQ
Frequently asked questions
What information is needed for wet-well level selection?
Provide well dimensions, minimum and maximum levels, pump start and stop points, inlet location, turbulence, foam, sediment, grease, condensation and possible flooding. Show the available mounting point, cable route and method for safe removal and cleaning. Add liquid density and venting details if hydrostatic measurement is considered. The proposed range, dead zone, materials and environmental protection should then be verified for the exact configuration.
Why can a wastewater flow meter read poorly at night or low load?
Low velocity may approach the usable lower range, while pump cycling, partially filled pipes, entrained air, deposits or an unsuitable bore can make the profile unstable. Provide true minimum flow, not only the daily average, and describe pipe orientation and pump operation. The sizing review should check full-pipe condition, velocity range, zero behaviour and upstream disturbances. Commissioning should include the lowest representative operating state.
Can a level sensor alone measure open-channel flow?
Only when its level result is combined with a defined hydraulic relationship, such as a correctly installed weir or flume curve, or another validated area-velocity method. Channel shape, approach flow, submergence, sediment and sensor location matter. Supply dimensions and expected flow range, then document the conversion and units. A distance reading without a controlled primary structure or method should not be presented as a validated flow result.