Introduction
The Rheonik RHM 20 Coriolis Mass Flow Sensor is a high-performance 2-inch Coriolis mass flow meter engineered for precise and reliable general-purpose flow measurement across a wide range of industrial applications. Designed with a maintenance-free architecture, the RHM 20 integrates advanced sensor technology and robust mechanical construction to ensure long-term operational stability, even under extreme process conditions. Its superior accuracy and repeatability enable consistent measurement of mass flow, density, and temperature, outperforming conventional flow technologies while maintaining a low total cost of ownership. The sensor is optimized for high-pressure and high-temperature environments, offering exceptional resistance to mechanical stress, corrosion, and aggressive media through a selection of high-grade wetted materials. With flexible process connection options and a wide operating envelope, the RHM 20 is ideally suited for demanding industries such as oil & gas, chemical processing, energy, and industrial manufacturing, where precision, durability, and reliability are critical.
- Flow Range: 1 kg/min up to 480 kg/min, ensuring accurate measurement across both low and high flow conditions
- Maximum Pressure Rating: Up to 1137 bar (16,490 psi), suitable for extremely high-pressure applications
- Operating Temperature Range: From -196°C (-321°F) up to +350°C (662°F), enabling performance in cryogenic to high-temperature environments
- Measurement Accuracy: ±0.1% of rate, delivering high-precision mass flow measurement
- Wetted Materials: SS 316L / SS 316Ti, Alloy C22 (2.4602), Tantalum (UNS R05200), Super Duplex (1.4410), providing excellent corrosion resistance and material compatibility
- Process Connections: Available from 1″ up to 2½”, offering flexibility for integration into various piping systems.
General Specification
| Nominal Flow (Qnom)* | 300 kg/min (661.4 lb/min) |
| Maximum Flow (Qmax)* | 480 kg/min (1058.22 lb/min) |
| Typical Minimum Flow (Qmin)* | 1 kg/min (2.2 lb/min) |
| Serial Tube / Single Path | Flow rates Qmax, Qnom, and Qmin for “serial” sensors will be 50% of the above-listed parallel/dual path version. |
| Operating Temperature | Fluid temperature range options cover applications from -196°C to 350°C (-320°F to 662°F). |
| Ambient Temperature | -50°C to +80°C (-60°F to +180°F) (standard), versions available for installation in a vacuum chamber (-260°C / -430°F) or oven (up to +210°C / +410°F) (optional) |
| Pressure Ratings | Up to 1379 bar / 20000 psi – dependent upon material |
| Electrical Connection Sensor w/o Integral Transmitter |
M20 x 1.5 standard cable entry for JM, SM terminal box versions |
| Sensor Enclosure Materials |
Stainless steel 304 (standard), SS 316 (optional) |
| Enclosure Type | Protection class IP66, NEMA 4X (standard), IP66/67, NEMA 4X/6 (optional) |
| Wetted Materials |
Flow tubes SS 316Ti, Alloy C22, Tantalum or SuperDuplex |
| Process Connections | Nearly any – the Rheonik AnyPipeFit Commitment. Consult the factory for types/sizes not listed in this data sheet on the Mechanical Construction pages |
| Pressure Rating Compliance |
Europe – PED: Sound Engineering Practice (SEP), Module A2, Module B3.1+C2 |
| Certifications and Approvals |
ATEX / IECEx Approvals for Zone 0, 1 (details see page 17) |
| Testing and Inspection | All sensors are hydro tested, calibrated, and supplied with a traceable calibration certificate. Customized calibration and testing services are available |
| Project Documentation and QA, Services |
Rheonik offers a full set of services for large and complex engineering projects.
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| Options |
Enclosure heating for high temperature applications |
Pressure Drop
At Qnom, the pressure drop across a parallel tube sensor will be approximately 1 bar (14 psi) for H2O. Sensors can be operated at higher flow rates up to Qmax, but the pressure drop will be higher. Typical Minimum Flow Qmin is the recommended lowest flow rate for an accurate measurement. Sensors will measure flow rates lower than Qmin, but uncertainty will increase beyond 1% of the rate.
The flow rate specifications above relate to standard pressure, parallel tube, and manifold sensor versions. Models with higher pressure ratings have increased wall thickness and will have higher pressure drops.
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