Rheonik RHM20 Coriolis Flow Sensor is a 2″ meter designed for general-purpose flow measurement without the need for maintenance. Robust and accurate, the RHM 20 outperforms other flow technologies at an attractively low cost of ownership.
Nominal Flow (Qₙₒₘ)* | 300 kg/min (661.4 lb/min) |
Maximum Flow (Qₘₐₓ)* | 300 kg/min (661.4 lb/min) |
Typical Minimum Flow (Qₘᵢₙ)* | 3 kg/min (6.6 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 Optional entries available: ½” NPT or M25 x 1.5 (only for SM) or ¾″ NPT (only for SM) M16 x 1.5 standard cable entry for PM terminal box version Max. cable length to remote RHE transmitter 100 m/330 ft |
Sensor Enclosure Materials | Stainless steel 304 (standard), SS 316 (optional) Coated aluminum terminal box, SS 316 terminal box (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 Manifolds SS 316L; Seal material (manifold construction): PTFE Standard flanges SS 316Ti, other connections SS 316L Additional/customer-specific materials available upon request |
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 Canada – CRN: Canadian Registration Number |
Certifications and Approvals | ATEX / IECEx Approvals for Zone 0, 1 (details see page 17) North American Approvals Class I, Div. 1, 2, Gr. A, B, C, D, Zone 0, 1 American Bureau of Shipping (ABS) Product Type Approval for use on marine vessels |
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. Typical services offered are, but are not limited to:•Certificates of origin and conformity, mill certificates•Data books including WPAR, WQS, NDT, test & quality plans, functional testing, calibration procedures, customized packing, factory acceptance, etc.•Painting to project specification •Start up and commissioning services on/offshore |
Options | Enclosure heating for high-temperature applications Cleaning for oxygen service, … For more consult the factory |
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Typical applications include:
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Sensors are manufactured with two internal measurement tubes arranged side by side. In parallel or dual path sensors (order code Pxx), these tubes are connected in parallel and the flowing fluid is split equally between them. In serial or single-path sensors (order code Sxx), the internal tubes are connected end to end, creating a single path through which all fluid flows. Manifold designs have a removable inlet/outlet manifold block and utilize selectable seals between the manifold and sensor body. In sealless designs, the measurement tubes are continuous between the process connections and do not have seals. Manifold designs offer shorter delivery lead times and may have a lower pressure drop than sealless designs for the same flow rate.
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The maximum pressure (Pmax) of a sensor is determined by its lowest-rated part. The lowest rated part can be either the measurement tube (Pmax indicated below), the connection block/manifold
(Pmax indicated in the mechanical construction section) or the process connection (for Pmax see published standards or manufacturer information).
All uncertainty statements refer to reference conditions – the mass flow of water, 18 – 24 °C, 1 – 3 bar in a standard temperature, pressure, and material configuration sensor. The sensor can be used to measure gas – uncertainty values for gas equal to the liquid value plus 0.3 %. Reference conditions for gas are mass flow of natural gas, 18 – 24 °C, 35 to 100 bar in a standard temperature, pressure, and material configuration sensor.
The turn-down capability from the Qnom of the flow sensor is driven mainly by its zero-point stability. At the very low end of the measuring range, the uncertainty (u) is dominated by zero-point stability. The zero point stability of a standard sensor is 0.00246 kg/min (0.00542 lbs/min). The zero point stability of a Gold Line sensor is 0.0012 kg/min (0.00264 lbs/min).
For flow Q ≥ zero stability / (calibration uncertainty/100) u = calibration uncertainty
For flow Q < zero stability / (calibration uncertainty/100) u = (zero stability/Q) x 100
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Source: www.rheonik.com