The RHM 02 is available with a wide selection of wetted materials and the highest pressure and temperature ratings in the market. It is suitable for all low flow applications where high accuracy is a must.
- Range: 0.01 kg/min up to 2.7 kg/min
- Pressure: up to 1436 bar (20827 psi)
- Temperature: -196°C (-321°F) up to +210°C (410°F)
- Accuracy: 0.1 % of rate
- Materials: SS 316L / SS 316Ti, Super Duplex – 1.4410
- Process Connection: ¼" up to 1"
Nominal Flow (Qₙₒₘ)*
1.8 kg/min (1.32 lb/min)
Maximum Flow (Qₘₐₓ)*
2.7 kg/min (2.65 lb/min)
Typical Minimum Flow (Qₘᵢₙ)*
0.01 kg/min (0.02 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 from -196 °C to +210 °C (-320 °F to +410 °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)
1436 bar (20827 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 IP 66, NEMA 4 (standard), IP 66/67, NEMA 4X (optional)
Flow tubes SS 316 L or SuperDuplex
Manifolds SS 316 L, seals FKM, FFKM, FVMQ
Standard flanges SS 316 Ti, other connections SS 316 L
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
PED 2014/68/EU Article 4, Section 3 (SEP)
Certifications and Approvals
ATEX / IECEx Approvals Zone 0, 1, 2 (see page 18)
North American Approvals Cl. I, Div. 1, 2, Gr. A,B,C,D, Zone 0, 1, 2 (see page 18)
American Bureau of Shipping (ABS)
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
Customization services for machine integration. Consult factory
* At Qₙₒₘ pressure drop across a parallel tube sensor will be approximately 2 bar (29 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.
At Qnom, pressure drop across a parallel tube
sensor will be approximately 1-3 bar (15-44 psi)
for H20.Sensors can be operated at higher flow rates but 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 rate.
The flow 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.