Critical Technical Advantages
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Integrated Diameter Reduction: The meter body is designed with a reduced cross-section (e.g., a DN 80 meter with internal DN 50 or DN 40 dimensions). This accelerates the flow to create stable vortices even at very low flow rates, which is essential for accurate energy balancing in systems that operate significantly below their design capacity.
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Cost-Saving Installation: Traditionally, measuring low flows required “reducing” and “expanding” the piping manually with flanges and reducers. The Prowirl R eliminates these extra components and the associated welding/installation time, providing a “plug and play” solution for mismatched pipe and flow sizes.
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Multivariable Energy Measurement: The Prowirl R 200 can integrate temperature and pressure sensors directly into its body. This allows for the simultaneous calculation of mass flow and energy flow for steam and gases, compensating for density changes in real-time within a single device.
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PremiumCal Accuracy: With the PremiumCal option, the device maintains its high measuring accuracy even at low Reynolds numbers (down to Re 10,000). This ensures that energy management remains precise during periods of minimum production or standby.
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Robust Capacitive Sensor: The DSC (Differential Switched Capacitive) sensor is resistant to temperature shocks and water hammer. Its drift-free performance ensures that the meter does not require frequent zero-point adjustments, providing long-term stability in steam and gas lines.
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Heartbeat Technology: This integrated suite provides continuous self-monitoring and in situ verification. It allows operators to confirm that the meter is functioning correctly and generates a verification report for quality audits without stopping the process.
Detailed Technical Performance Matrix
| Specification | Technical Details and Ranges |
| Measured Variables | Volume flow, temperature, pressure |
| Calculated Variables | Mass flow, energy flow, heat flow |
| Integrated Reduction | 1 line size (e.g., DN 50 > 40) or 2 line sizes (e.g., DN 50 > 25) |
| Nominal Diameter | Up to DN 250 (10″) mating pipe |
| Accuracy (Steam/Gas) | ±0.9% (o.r.) / PremiumCal: ±0.6% |
| Accuracy (Liquids) | ±0.75% (o.r.) |
| Medium Temperature | –200 to +400 °C (–328 to +752 °F) |
| Communication | HART, PROFIBUS PA, FOUNDATION Fieldbus, Modbus RS485, EtherNet/IP, PROFINET |
Primary Applications
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Steam Header Energy Management: Measuring steam flow in headers that are oversized for current production levels.
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Compressed Air Balancing: Precise tracking of air consumption in facilities where air usage varies significantly between shifts.
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Natural Gas Monitoring: Accurate measurement of fuel gas in burners and boilers that have a wide turndown requirement.
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Nitrogen/Oxygen Usage: Tracking expensive industrial gases where flow rates are typically low but high precision is required for cost allocation.
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Retrofitting Existing Plants: Replacing older, inaccurate flowmeters (like orifice plates) in existing pipes without modifying the surrounding pipework.
