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 "
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.
Fluid temperature range options cover applications from -196°C to 350°C (-320°F to 662°F).
-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)
Up to 1379 bar / 20000 psi - dependent upon material
Electrical Connection Sensor
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)
Protection class IP66, NEMA 4X (standard), IP66/67, NEMA 4X/6 (optional)
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
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.
•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
Enclosure heating for high temperature applications
Cleaning for oxygen service , …
For more consult factory
* At Qnom pressure drop across a parallel tube sensor will be approximately 1 bar (14 psi) for H20. Sensors can be operated at higher flow rates up to Qmax but 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 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.