Racine Vortex has released their RNS Series (Insertion) and RWS Series (Wafer) Vortex Steam Flow Meters. The meters are suitable for measuring non-condensing steam and saturated process steam at pressures up to 150 psi. Leading applications include boiler monitoring and other energy-related uses, as well as building and facilities management. Both the RNS and RWS series meters have no moving parts and are virtually maintenance-free. All meters in both series are loop-powered devices with standard HART communication for ease of field programming and system integration.

Both meters work in operating temperatures of -20 to 366 °F. An internal RTD and an optional external pressure sensor provide data to the internal flow meter software, which compensates for changes in temperature and pressure to achieve an accurate flow measurement. Accuracy of both meters is ±1% of reading, with repeatability of 0.5%. The RNS and RWS meters are pre-calibrated for specific uses, and can be rescaled in the field with the use of the provided PC-based software program.

The RNS Series insertion flow meter is available for pipe sizes from 6 to 72 inches (152 to 1829 mm), has a 35:1 turndown ratio, and can be configured for mass flow measurements.

The RWS Wafer meter has 316SS wetted parts, an extremely small bluff bar for little or no pressure drop, and NIST-traceable calibration. It is available in five sizes for flange mounting in pipes from 1/2 to 4 inches.


• Measured: Saturated steam • Flow Range: See flow range table (page 3) • Operating Temperature: -20 °F to +366 °F (-28 °C to +186 °C) • Ambient Temperature Limits: -20 °F to +155 °F (-28 °C to +68 °C) • Operating Pressure: -5 to 150 PSIG • Accuracy: ±1% of reading over dynamic range of meter • Repeatability: 0.5% of reading • Input Power: 24 VDC • Signal Output: 2-wire, 4-20 mA loop • RTD: Platinum, PT-100, high accuracy temperature o measuring element • Construction: 316 Stainless steel, PEEKTM, • INCONEL® and o Geothermal EPDM wetted parts, NEMA 7 transmitter  enclosure standard • Communications: HART® Protocol (via PC or HART Modem) • Certifications: CE o Optional ATEX o (Equiv. to N.A. Class I, Div 1, Groups C & D, T4) • Options: 2 line, 8 digit rate/totalizer display o Remote electronics • 2G ib B T4
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