Rheonik RHM60 Coriolis Mass Flow Meter

• Standard pressure ratings up to 490 bar (7107 psi)
• Temperature ratings from -196 to 350°C (-320 to 662°F)
• Mass flow uncertainty down to 0.15%
• Density uncertainty down to 0.5%
• Repeatability better than 0.05%
• Typical measuring ranges between 60 and 3000 kg/min
• Accurately measure low flow rates down to 45 kg/min
• Unique robust torsion has driven the oscillation system
• Process connection customization available
• Approved for use in hazardous areas
• Stainless steel case
• Remote and compact transmitter versions are available

Applications

• Plant Balance
• Terminal Transfer
• Asphalt/Bitumen and Other High-Temperature Fluids
• Viscous Fluids
• Reactor Charging
• Batching
• Barge, Ship, Rail Car, and Truck Filling

Benefits

• The torsion oscillator design assures a stable and drift-free measurement with excellent signal to noise ratios
• Resilient to external noise and vibration
• Insensitive to pipe pressure changes
• Robust tube wall thickness provides increased operational safety in abrasive Applications
• Corrosion-resistant
• Long sensor life is guaranteed due to low mechanical stresses in the meter mechanism
• No moving parts to wear or fail

Mechanical Construction

Sensors are manufactured with two internal measurement tubes arranged side by side. In parallel or dual path sensors, these tubes are connected in parallel and the flowing fluid is split equally between them. In sealless designs, the measurement tubes are continuous between the process connections and do not have seals.

Uncertainties and flow measurement turn-down

All uncertainty statements refer to reference conditions – 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 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 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 the zero point stability. The zero point stability of a standard sensor is: 0.000036 kg/min (0.000079 lbs/min). 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 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.

Rheonik Coriolis Mass Flow Meter RHM60 Specifications

Small Size Coriolis Mass Flow Sensor

Ideal for embedded systems and precise small flow applications

• RHM 015 Low Flow Mass Flow Meter flow rate
• RHM 02 Low Flow Mass Flow Meter flow rate
• RHM 03 Low Flow Mass Flow Meter flowrate
• RHM 04 Low Flow Mass Flow Meter flow rate
• RHM 06 Low Flow Mass Flow Meter flowrate
• RHM 08 Low Flow Mass Flow Meter flow rate