Description
Rheonik RHM02 Corioliss Mass Flow Sensor 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 the rate
- Materials: SS 316L / SS 316Ti, Super Duplex – 1.4410
- Process Connection: ¼” up to 1″
General Specifications
| 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. |
| Operating Temperature | Fluid temperature range options cover from -196 °C to +210 °C (-320 °F to +410 °F) For integral transmitter versions please refer to the transmitter datasheet |
| 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 | 1436 bar (20827 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 IP 66, NEMA 4 (standard), IP 66/67, NEMA 4X (optional) |
| Wetted Materials | 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 |
| 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 | 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. 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 | Customization services for machine integration. Consult factory |
Applications
Typical applications include:
- General Flow Control
- Additive Dosing
- Mixing and Batching
- Chemical Injection
- Package and Container Filling
Features
- The typical measuring range is up to 2.7 kg/min (5.95 lb/min)
- Pressure ratings up to 1436 bar (20827 psi)
- Temperature ratings from -196 to +210 °C (-320 to +410°F) – extended on request
- Mass flow uncertainty down to 0.05 %
- Repeatability down to 0.05 %
- 4 kHz measurement updates and response time of less than 10 ms when used with RHE 40 Series transmitters
- Accurately measure flow rates down to 10 g/min
- The Rheonik AnyPipeFit Commitment provides custom process connection type and size flexibility on any meter to suit your existing plant, saving time and expense on installation costs
- Compact design with minimal pipeline footprint
- Approved for use in hazardous areas
- SS 304 Stainless steel enclosure, SS 316 optional
- Integral and remote transmitter versions are available
Mechanical Construction
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.
Performance Data
- Flow Measurement Uncertainty
- Selected Sensors down to ±0.05 % ¹ of rate (Gold Line)
- Standard Sensors down to ±0.15 % ² of rate
- Flow Measurement Repeatability
- Down to ±0.05 % of rate
- Temperature Measurement
- Better than ±1 °C
- Density Calibration (Liquid)
- Selected Sensors down to ±0.0005 kg/liter (Gold Line)
- Standard Sensors down to ±0.001 kg/liter
Uncertainties and Flow Measurements Turn-down
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 mainly driven 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 0.000036 kg/min (0.000079 lbs/min). The zero stability of a Gold Line sensor is 0.000019 kg/min (0.000042 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
Uncertainties from environmental and process conditions
- If sensors are not zeroed at operating conditions, minor additional uncertainties can arise from elevated temperatures and pressures: ±0.00308 % of maximum flow per °C and ±0.0208 % of maximum flow per bar.
- Process temperature effect on density: additional uncertainty of ±0.000641 g/cm³ per °C difference from calibration temperature with standard density calibration and of ±0.000073 g/cm³ per °C difference from calibration temperature with enhanced density calibration. This effect can be mitigated by a simple field density adjustment at operating conditions.
- Process pressure effect on mass flow: The effect of pressure on flow measurement is 0.001 % of the rate per bar. Compensation is possible by pressure sensor input (analog input or digital write) or manual value entry into the transmitter.
- Process pressure effect on density: The effect of pressure on density measurement is 0.00012 g/cc per bar. Compensation is possible by pressure sensor input (analog input or digital write) or manual value entry into the transmitter.
Source: www.rheonik.com
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