Rheonik RHM 20 Flow Sensor

The RHM 20 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.

Range: 1 kg/min up to 480 kg/min
Pressure: up to 400 bar (5801 psi)
Temperature: -50°C (-58°F) up to +210°C (410°F)
Accuracy: 0.1 % of rate
Materials: SS 316L / SS 316Ti, Alloy C22 – 2.4602, Tantalum – UNS R05200, Super Duplex – 1.4410
Process Connection: 1″ up to “

MFG Part Number	RHM-20
Stock	Limited

SKU RHEONIK-RHM-20 Category Sensors Tag Rheonik

General Specifications

Nominal Flow (Q_nom)*	300 kg/min (661.4 lb/min)
Maximum Flow (Q_max)*	480 kg/min (1058.22 lb/min)
Typical Minimum Flow (Q_min)*	1 kg/min (2.2 lb/min)
Serial Tube / Single Path	Flow rates Q_max, Q_nom and Q_min 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 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 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 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 factory

Pressure Drop

At Q_nom 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 Q_max but pressure drop will be higher. Typical Minimum Flow Q_min is the recommended lowest flow rate for an accurate measurement. Sensors will measure flow rates lower than Q_min but uncertainty will increase beyond 1% of rate.

The flow rate specifications above relate to standard pressure, parallel tube, manifold sensor versions. Models with higher pressure ratings have increased wall thickness and will have higher pressure drops.

Rheonik RHM 20 Flow Sensor

General Specifications

Pressure Drop

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