Introduction
The Rheonik RHM 40 Coriolis Mass Flow Sensor is a high-performance mass flow measurement solution engineered for demanding general process applications requiring superior accuracy, a wide operating range, and robust mechanical integrity. Designed with optimized flow geometry, the sensor ensures minimal pressure drop while delivering exceptional turndown capability, enabling precise measurement across both low and high flow conditions. Its advanced Coriolis measurement principle provides direct mass flow, density, and temperature readings with high repeatability and long-term stability. The RHM 40 is constructed to operate reliably under extreme process environments, offering a wide selection of corrosion-resistant materials and high-pressure ratings suitable for industries such as oil & gas, chemical processing, and power generation. Its rugged design, combined with flexible process connections, ensures seamless integration into a variety of industrial systems while maintaining high operational efficiency and measurement integrity.
- Flow Range: 20 kg/min up to 1500 kg/min
- Pressure Rating: Up to 433 bar (6280 psi)
- Operating Temperature: -196°C (-321°F) up to +350°C (662°F)
- Accuracy: ±0.1% of rate
- Wetted Materials: SS 316L / SS 316Ti, Alloy C22 (2.4602), Super Duplex (1.4410)
- Process Connections: 3″ up to 3″
General Specifications
| Nominal Flow (Qnom)* | 1200 kg/min (2645.6 lb/min) |
| Maximum Flow (Qmax)* | 1500 kg/min (3306.9 lb/min) |
| Typical Minimum Flow (Qmin)* | 20 kg/min (44.1 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). For integral transmitter versions, please refer to the transmitter datasheet |
| Ambient Temperature | -50°C to +80°C (-60°F to +180°F) (standard) |
| Pressure Ratings | Up to 433 bar / 6280 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 |
1.4571 (SS 316Ti), 1.4410 (SuperDuplex), 2.4602 (Alloy C22) – standard |
| 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: Module A2, Module B3.1+C2 |
| Certifications and Approvals |
ATEX / IECEx Approvals for Zone 0, 1, 2 (details see page 12) |
| 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 1-3 bar (15-44 psi) for H2O. Sensors can be operated at higher flow rates, but the pressure drop will be higher. Qmin is the recommended lowest flow rate. Sensors will measure flow rates lower than Qmin, but uncertainty will increase beyond 0.5 % of the rate.
The flow 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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