Rheonik RHM40 Coriolis Mass Flow Sensor

The Coriolis Mass Flow sensor rhm40 offers a low-pressure drop and exceptional turndown capability. Designed for general process applications, the RHM 40 is available with a choice of materials and the highest pressure ratings.

• Range: 20 kg/min up to 1500 kg/min
• Pressure: up to 380 bar (5511 psi)
• Temperature: -196°C (-321°F) up to +350°C (662°F)
• Accuracy: 0.1 % of the rate
• Materials: SS 316L / SS 316Ti, Alloy C22 – 2.4602, Super Duplex – 1.4410
• Process Connection: 2″ up to 3″

General Specifications

Coriolis Mass Flow sensor rhm40 Applications

Typical applications include:

• General Flow Control
• Plant Balance
• Terminal Transfer
• Mixing and Batching
• High Temperature Fluids
• Barge, Ship, Rail Car, and Truck Filing

Features

• The typical measuring range is up to 1500 kg/min (3306.93 lb/min)
• Pressure ratings up to 433 bar (6280 psi)
• Temperature ratings from -196 to +350 °C (-320 to +662°F) – extended on request
• Mass flow uncertainty down to 0.1 %
• 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 20 kg/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
• 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.

Performance Data

• Flow Measurement Uncertainty
• Selected Sensors down to ±0.10 % 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

Measurement Tube Pressure Ratings

The maximum pressure (Pmax) of a sensor is determined by its lowest-rated part. The lowest rated part can be either the measurement tube (Pmax indicated below), the connection block/manifold (Pmax indicated in the mechanical construction section), or the process connection (for Pmax see published standards or manufacturer information).

Uncertainties and Flow Measurement 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).