Advantages in Water & Wastewater
- High Accuracy & Reliability ±0.5% accuracy for conductive liquids like drinking water, sewage, and industrial effluent. Unaffected by changes in density, viscosity, or temperature (as long as conductivity is sufficient).
- No Moving Parts – Low Maintenance Ideal for slurries, raw sewage, and dirty water since there’s no risk of clogging. Reduces long-term maintenance costs compared to mechanical meters (e.g., turbine or paddlewheel).
- Bidirectional Flow Measurement Can measure forward and reverse flow, useful in pump stations, backflow prevention, and recycling systems.
- Minimal Pressure Drop Smooth-bore design (no obstructions) ensures no energy loss, making it efficient for large pipelines.
- Handles Corrosive & Abrasive Fluids Liner options (rubber, PTFE, PFA) protect against chemicals, acids, and abrasive particles in wastewater. Stainless steel or Hastelloy electrodes resist corrosion in harsh environments.
- Wide Pipe Size Range (DN10 to DN3000+) Suitable for small distribution lines to large sewer mains and industrial discharge systems.
- No Calibration Drift Over Time Unlike mechanical meters, magmeters do not wear out, ensuring long-term stability.
Limitations in Water & Wastewater
- Requires Minimum Conductivity (Typically >5 μS/cm) Pure water (deionized/distilled) cannot be measured. Some treated effluents or rainwater may need conductivity enhancement (e.g., adding salts).
- Not Suitable for Non-Conductive Fluids Oils, hydrocarbons, and organic solvents cannot be measured.
- Initial Cost Higher Than Mechanical Meters More expensive upfront than turbine or ultrasonic meters, but lower lifetime cost due to minimal maintenance.
- Requires Full Pipe for Accurate Measurement Air bubbles or partial flow can cause errors. Proper installation (vertical or horizontal with electrodes in correct orientation) is critical.
- Affected by Electrical Noise Strong electromagnetic interference (EMI) from nearby pumps or power lines can disrupt signals. Proper grounding and shielding are necessary for stable operation.
- Limited to Liquid Applications
Cannot measure gases, steam, or multiphase flows (e.g., air-entrained water).
Best Practices for Water/Wastewater Applications
Use PTFE or rubber liners for corrosive/abrasive fluids (e.g., acidic wastewater).
Ensure proper grounding to avoid signal noise.
Install in a fully filled pipe (avoid air pockets).
Clean electrodes periodically in dirty water/slurry applications.