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 1137 bar (16490 psi)
Temperature: -196°C (-321°F) up to +350°C (662°F)
Accuracy: 0.1 % of rate
Materials: SS 316L / SS 316Ti, Super Duplex – 1.4410, Alloy C22 – 2.4602, Tantalum – UNS R05200
Process Connection: 1" up to 2 ½"

CONFIGURE

CATEGORY Medium Size Sensors, Chemical Injection, Fuel Consumption, Oil Measurement, Plastics Production

General

General Specifications

Nominal Flow (Qₙₒₘ)*	360 kg/min (793.66 lb/min)
Maximum Flow (Qₘₐₓ)*	480 kg/min (1058.22 lb/min)
Typical Minimum Flow (Qₘᵢₙ)*	1 kg/min (2.21 lb/min)
Operating Temperature	Fluid temperature range options cover from -50 °C (-58 °F) to +210 °C (+410°F). Extended temperature ranges on request. For integral transmitter versions please refer to transmitter datasheet
Ambient Temperature	Standard -50 °C (-58 °F) to +80 °C (+180 °F). High temperature versions available for oven installation up to +210 °C (+410 °F).
Pressure Ratings	Up to 400 bar (5801 psi) – depending on the material
Electrical Connection Sensor w/o Integral Transmitter	M20 x 1.5 standard cable entry Optional entry available : ½" NPT Max. cable length to remote RHE transmitter 100 m/330 ft.
Sensor Enclosure Materials	SS 304 (standard), SS 316L (optional) Coated aluminum terminal box, SS 316L terminal box (optional)
Enclosure Type	IECEX tested protection class IP66 (IP66 is mostly equivalent to NEMA 4X) Optional IP66-IP67 (IP67 declared by manufacturer, IP67 is mostly equivalent to NEMA 6)
Wetted Materials	Flow tubes SS 316L, Alloy C22 or Super Duplex, Tantalum (see datasheet) Connection blocks SS 316L, seals FKM, FFKM, FVMQ, EPDM, HNBR Standard flanges SS 316Ti, other connections SS 316L Additional/customer specific materials available upon request
Process Connections	Nearly any – the Rheonik AnyPipeFit Commitment covers a wide range of process connection types and sizes. Consult factory for types/sizes not listed (see datasheet).
Pressure Rating Compliance	Pressure Equipment Directive (PED). Others (e.g. CRN) on request.
Certifications and Approvals	ATEX / IECEx Approvals Zone 0, 1, 2 (see datasheet) North American Approvals Cl. I, Div. 1, 2, Gr. A, B, C, D, Zone 0, 1, 2 Canadian Registration Number (CRN) OIML, custody transfer certification DNV, CCS approval for marine applications
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 WPS-WPQR, WPQ, 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	Customization services for machine integration available upon request.

* At Qₙₒₘ pressure drop across a parallel tube sensor will be approximately 1.3 bar (18.86 psi) for H₂O. 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, connection block sensor versions. Models with higher pressure ratings have increased wall thickness and will have higher pressure drops.