Introduction
The Rheonik RHM 03 Coriolis Mass Flow Sensor is a high-precision Coriolis mass flow meter engineered for demanding low-flow applications where exceptional accuracy, repeatability, and reliability are critical. Designed with a robust mechanical structure and optimized flow tube geometry, the RHM 03 ensures stable performance across a wide range of operating conditions, including extreme pressures and temperatures. Its compatibility with a broad selection of wetted materials enables reliable operation in highly corrosive, high-purity, and aggressive process environments, making it ideal for use in chemical processing, oil & gas, pharmaceuticals, and specialty industrial applications. With industry-leading pressure and temperature ratings, the sensor maintains measurement integrity even under severe process conditions, while its advanced signal processing capabilities ensure accurate mass flow measurement independent of fluid properties such as density, viscosity, or conductivity.
- Flow Range: 0.03 kg/min up to 7.5 kg/min
- Maximum Pressure Rating: Up to 1311 bar (19,014 psi)
- Operating Temperature Range: -196°C (-321°F) up to +350°C (662°F)
- Measurement Accuracy: ±0.1% of rate
- Wetted Materials: SS 316L / SS 316Ti, Super Duplex (1.4410), Alloy C22 (2.4602)
- Process Connections: ¼” up to 1″
General Specification
| Nominal Flow (Qnom)* | 5 kg/min (11 lb/min) |
| Maximum Flow (Qmax)* | 7.5 kg/min (16.5 lb/min) |
| Typical Minimum Flow (Qmin)* | 0.04 kg/min (0.88 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 from -196°C to +210°C (-320°F to +410°F) |
| Ambient Temperature | -50°C to +80°C (-60°F to +180°F). High temperature version for oven installation up to +350°C (+662°F) available |
| Pressure Ratings | Up to 1311 bar / 19014.45 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 IP 66, NEMA 4 (standard), IP 66/67, NEMA 4X (optional) |
| Wetted Materials |
Flow tubes SS 316L 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 | PED 2014/68/EU Article 4, Section 3 (SEP) |
| Certifications and Approvals |
ATEX / IECEx Approvals Zone 0, 1, 2 (details see page 18) |
| 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 | Customization services for machine integration. Consult factory |
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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