| 1 | Electromagnetic Flow Meter | Municipal water, process water, wastewater, and conductive chemical liquids | Typically ±0.2% to ±0.5% of rate, depending on design and operating range | Install with a full pipe; provide grounding and a stable, electrically conductive liquid. Follow the manufacturer’s straight-run requirement. | Verify zero flow with a filled, stationary pipe. Perform wet calibration or accredited laboratory verification when required by regulation or custody-transfer procedures. | Inspect electrodes, grounding, liners, cable glands, and empty-pipe detection. Check for coating or deposits that may affect electrode contact. | No moving parts, low pressure loss, bidirectional measurement, and good performance with dirty water | Cannot measure non-conductive liquids; pipe must remain full for reliable readings |
| 2 | Inline Ultrasonic Transit-Time Meter | Clean water distribution, cooling-water loops, utility monitoring, and energy-management systems | Typically ±0.5% to ±1.0% of rate | Use a completely filled pipe with controlled flow. Avoid locations immediately downstream of pumps, valves, elbows, or partially open lines. | Confirm pipe material, internal diameter, wall thickness, liner, and fluid sound velocity. Compare against a traceable reference meter during commissioning. | Inspect transducers, signal quality, cable connections, and flow profile. Keep the pipe interior free from excessive scale or air pockets. | Excellent repeatability, low pressure loss, and compatibility with large pipe sizes | Accuracy can decline with entrained air, heavy solids, poor pipe data, or disturbed flow |
| 3 | Clamp-On Ultrasonic Meter | Temporary surveys, retrofit projects, leakage studies, and non-invasive flow monitoring | Typically ±1% to ±2% of rate under suitable pipe and fluid conditions | Mount sensors on a clean, straight section of full pipe. Enter accurate pipe dimensions and apply suitable coupling compound. | Validate sensor spacing, signal strength, zero-flow stability, and comparison with a calibrated reference. Recheck after sensor repositioning. | Clean the mounting surface, inspect clamps and cables, renew coupling compound when needed, and protect sensors from vibration and weather. | No pipe cutting, minimal downtime, and suitable for very large or difficult-to-access pipes | Sensitive to installation data, pipe lining, air bubbles, scale, and poor acoustic coupling |
| 4 | Insertion Electromagnetic Meter | Large-diameter pipelines, district metering, irrigation mains, and process-water networks | Typically ±1% to ±2% of rate when correctly positioned and profiled | Install the probe at the correct insertion depth in a full pipe. Use a flow conditioner or longer straight run where the flow profile is distorted. | Verify probe position, pipe internal diameter, sensor orientation, zero reading, and comparison with a reference measurement. | Inspect the insertion fitting, isolation valve, probe stem, electrodes, seals, grounding, and wiring for leakage or fouling. | Lower installation cost than a full-bore meter and practical for large pipelines | Measures a limited area of the flow profile and is more sensitive to swirl and incorrect insertion depth |
| 5 | Turbine Flow Meter | Clean process water, utility water, batching, and relatively stable flow measurement | Typically ±0.5% to ±1.0% of rate within the specified range | Use clean water, a full pipe, correct flow direction, and adequate straight run. Install a strainer when debris may damage the rotor. | Check the meter factor across the operating range using a gravimetric, volumetric, or comparison-based test method. | Inspect the rotor, bearings, pickup coil, strainer, and internal surfaces for wear, fouling, and lodged particles. | Good repeatability, compact construction, and useful pulse output for batching systems | Moving parts wear; unsuitable for abrasive, highly contaminated, or rapidly fluctuating flow |
| 6 | Positive Displacement Meter | Low-flow measurement, water consumption sub-metering, dosing, and intermittent service | Typically ±0.25% to ±1.0% of rate, depending on size and flow range | Install in a full pipe with flow in the marked direction. Protect against excessive pressure, debris, and water hammer. | Test multiple flow points because wear and viscosity can change the meter factor, especially at low flow rates. | Monitor pressure loss, inspect internal chambers and seals, clean upstream strainers, and replace worn moving components. | Strong low-flow performance and direct volumetric measurement | Moving parts create pressure loss and require more maintenance in dirty or abrasive water |
| 7 | Vortex Flow Meter | Industrial utility water, cooling systems, and applications requiring a broad process instrument platform | Typically ±1% to ±2% of rate for liquid service | Maintain a full pipe and adequate straight run. Avoid strong vibration, pulsating flow, and operation below the minimum Reynolds number. | Verify the K-factor, pulse output, flow-range settings, and zero-flow behavior. Compare readings with a traceable reference under stable conditions. | Inspect the bluff body and sensor for deposits, check vibration levels, and verify electrical connections and signal quality. | No rotor bearings, moderate pressure loss, and useful measurement diagnostics | Requires adequate flow velocity and is sensitive to vibration, pulsation, and two-phase flow |
| 8 | Coriolis Mass Flow Meter | High-value process water, blending, dosing, research, and applications requiring mass-flow data | Typically ±0.1% to ±0.5% of rate for liquid service, depending on meter size and application | Install according to the flow-tube orientation requirements and support the meter against excessive vibration or pipe stress. | Perform zero verification with no flow and stable conditions. Check density and temperature outputs against known reference values. | Inspect for tube coating, air entrainment, vibration, process leakage, and changes in zero stability. | Direct mass-flow measurement, high accuracy, and simultaneous density or temperature information | Higher purchase cost, greater weight, and possible sensitivity to air or two-phase flow |
| 9 | Open-Channel Area-Velocity Meter | Wastewater channels, partially filled pipes, stormwater systems, and industrial drainage monitoring | Typically ±2% to ±5% of rate, subject to level, velocity, geometry, and site conditions | Install the sensor in a representative, stable channel section with known cross-sectional geometry and minimal turbulence. | Verify level sensor calibration, channel dimensions, velocity profile, zero level, and flow conversion equations. | Remove sediment, grease, biological growth, and debris. Inspect sensor mounting, cables, and protective housings. | Measures flow where a closed-pipe meter cannot be installed and accommodates variable water levels | Accuracy depends strongly on channel geometry, sediment, turbulence, and changing flow profiles |
| 10 | Mechanical Woltmann-Type Meter | Large-volume water consumption, building services, irrigation, and industrial utility networks | Typically ±1% to ±2% of rate within the approved operating range | Install horizontally or in the approved orientation, keep the pipe full, and provide upstream filtration where debris is present. | Use a certified test bench or comparison meter. Check accuracy at low, transitional, and nominal flow points. | Inspect the turbine, bearings, register, seals, strainer, and pressure loss. Replace worn parts according to service condition. | Widely understood, cost-effective, and suitable for large-volume water measurement | Mechanical wear, pressure loss, and reduced accuracy when exposed to debris or prolonged low-flow operation |
