The Coriolis Effect was discovered by physicist Gustave Gaspard de Coriolis in the 1830’s, and is described as “the inertial force exerted on an object as a result of movement relative to a rotating frame of reference.” This science has been applied to many technologies: hydraulics, machine performance, missiles, ergonomics, ocean, and atmospheric circulation, and, of course, mass flow metering.
The use of the Coriolis Effect as a technique for liquid and gas mass flow measurement was firmly established over 25 years ago. Since then, several different designs of Coriolis Effect meters have been produced. With the tremendous advances made in electronic signal processing technology in recent years, the application base for Coriolis mass flow meters has expanded dramatically and the term “Coriolis meter” is now intimately associated with high accuracy and reliable performance in a flow measurement instrument.
HOW CORIOLIS METERS WORK
There are quite a few different Coriolis flow meter designs available. Each has its measurement tube arrangement but all work to essentially the same principle – the Coriolis Effect. Coriolis meters are primarily Mass Flow Meters and they can measure mass very accurately. When used for volumetric measurement, mass measurement is combined with a density value to provide a calculated volume flow rate
Rheonik Coriolis Meter Manufacture
Rheonik manufactures the world’s most comprehensive range of Coriolis Mass Flow meters. The Rheonik meter range features line sizes ranging from ¼” up to 12” and covers flow rates from 3 grams/min up to 30,000 kg/min.
Credited with being the first company to produce large and high-pressure Coriolis products, Rheonik continues to innovate and break the barriers of high-accuracy flow measurement. With temperature ratings from -325°F to 750°F and max pressure ratings of 20000 psi, Rheonik can supply metering for almost any application.
Unlike many other flow meter manufacturers, Rheonik only makes Coriolis meters – we are The Coriolis Experts – and your purchase of a Rheonik Mass Flow solution is supported globally by engineering professionals with many years of experience in metering and measurement instrumentation.
Every Rheonik Coriolis Flow Meter is designed to give many years of service in one a wide variety of applications across many industries. Before delivery, the meter was carefully calibrated and the entire sensor was subjected to an over-pressure test at 1.5 times the maximum operating pressure limit. Manufacturing records are meticulously maintained for each sensor to assist in any future support request received.
Rheonik flow meters are made for a wide variety of applications and comply with many international standards. Maximum operating limits (temperature, pressure) for each RHM flow sensor are stated on the permanently attached serial number plate and must not be exceeded.
Where flow meters are operated at elevated temperatures, thermal insulation around the sensor should be provided to ensure that the entire flow meter is kept at or very near the operating temperature of the process.
A complete flowmeter system typically consists of a:•
- RHMxxx Sensor
- RHExx Transmitter
- Interconnection cable
For almost 20 years now, RHEONIK Coriolis flowmeters have been used by industry to determine the volume of such liquids and gases as:
- Acid, lye, alcohol, hydrocarbons
- Bitumen, fats
- Oils (mineral oil, vegetable oil, synthetic oil)
- Foodstuffs (vegetable oil, beer, liquid yeast, liquid sugar, chocolate, soup, sauces)
- Beverages, flavoring, liquid carbon dioxide
- Lacquers, paint, filling compounds, rubber products
- Fuel (methanol, diesel, petrol, kerosene, methane gas, liquid hydrogen)
- Coolant, hydraulic oil, brake fluid
- Deionized (non-conductive) water
- Animal fodder additives (molasses, rape seed oil, flavoring)
- Cosmetics (creams, scented oils, emulsions)
- Polyol, isocyanate, polyester, propellants ( freon, pentane, etc.)
- Gas station products (natural gas, propylene, propane)
- Ultra-cold, liquid gases (hydrogen, nitrogen, oxygen, etc.)
- Slurry, suspensions (oil/water)
The advantage of using this patented measuring principle is that it allows for direct mass
- Given the rapid reaction time, the appliances are suited to both batch dosing and flow control or monitoring.
- The measurement is taken regardless of the pressure, temperature, viscosity, conductivity, or flow characteristics of the liquid.
- Due to its unique design, the measuring sensor is durable enough not to wear down even after many years of operation and is also a low-maintenance product.
- Inside the liquid stream, there are no fittings or rotating parts that could block the flow and consequently lead to a very costly shutdown of the production facilities.
- Installing the flow meter into the pipeline system is easy. No long tube runs in front of and behind the sensor need to be taken into account and the measuring sensor can be mounted almost directly behind turbulence creating elbows or pipe diameter reducers without impairing the accuracy of the measurements.
- Measuring media with fibrous content with a high solid charge does not pose any real difficulty. If used by the instructions, it is, unlike positive-displacement counters, possible to do without expensive filters without actually damaging the measuring sensor.
- Measurements can be taken by the measuring sensor irrespective of the flow of the liquid. Sudden pressure peaks or water shocks in the pipeline will not damage the appliance. In such an instance, other purely mechanical measuring procedures are prone to impeller wheels over torquing, axles breaking, or bearings becoming displaced, which all result in the measuring device becoming unusable or even blocking the flow of liquid.
- Rheonik appliances are calibrated at the manufacturer’s site on precision test benches and can be operated directly without the need for local adjustments. A calibration certificate is supplied with the appliance
The Flow Measurement System
The complete flowmeter system consists of a:
- Sensor, type RHMxx
- Transmitter, type RHExx
- Connection cable
Inside the measuring sensor, there are precision tubes that are energized by an electromagnetic drive system, which itself is fed by the transmitter, to vibrate at their natural frequencies.
When a liquid or gas flows through the vibrating tubes, it is subjected to additional deflection due to the degree of inertia that is generated. This deflection is recorded electronically by two velocity sensors and a high-precision electronic time delta.
This measured quantity is proportional to the mass flow rate. Further, conversion into physical units is done in a purely digital manner using a signal processor in the transmitter. At the same time, all of the appliance’s functions are constantly monitored. Should any disruptions occur, all of the errors that have occurred are immediately reported in the display.
The transmitter has a 4 to 20 mA analog output with the programmable span, which is proportional either to the measured mass flow rate or the temperature; it also has an impulse output that supplies mass-proportional impulses.
All of the outputs and measuring functions can be verified at any time by the user by using the diagnostic mode in the appliance. The maintenance or new calibration intervals can be monitored via a run-time counter.
For service or repair purposes, the transmitter and flow sensor can be replaced independently of each other. This significantly reduces the costs of spare parts for the installed flow sensor/transmitter.
During the factory calibration, the mass flow sensor can be calibrated independently of the transmitter. All sensor-specific calibration data can be programmed using magnetic switches located on the front panel.
To achieve this, the instrument does not need to be opened. All of the relevant data is buffered in a non-volatile semiconductor device (EEPROM).
Rheonik Coriolis Mass Flow Meter Products
Rheonik RHM Omega Tube Coriolis Flow Sensors
Inside an RHM sensor, there are precision tubes energized by an electromagnetic drive system controlled by the attached RHExx transmitter. These tubes vibrate at their natural frequency.
When a fluid (liquid or gas) flows through these vibrating tubes, they are subjected to nonsymmetrical deflection, the degree of which is determined by the mass of the fluid passing through. This deflection is detected electronically by two sensors within the flow meter body. High-precision electronics in the transmitter process the sensor signals and calculate a time delta between them. This time delta is proportional to the mass flow rate.
RHMxxx sensors are intrinsically safe and can be certified for use in hazardous areas when connected to a suitably certified transmitter.
Standard flow meter dimensional information can be found in each of the RHMxxx data sheets. Data sheets or exact drawings for customized products can be obtained through your local sales/support agent or from Rheonik.
The Rheonik Omega Tube meter mechanism consists of three distinct sections:
The Measurement Section
- Pickup Coils – provide signals to the transmitter
- Measurement Tubes – the part of the meter where the measurement takes place
The Meter Drive System
- Mass Bars – provide stability and support to the measurement tube oscillation
- Drive Coils – provide power to maintain oscillations at a constant amplitude
- Torsion Rods – help energize and guide oscillation
The Meter Connection System
- In/Out Section – decouples measurement tubes from process line stress and misalignment
Each section plays a specific role in ensuring that the meter performs at a high level when measuring flow. The following information briefly describes the role of the various components within the flow meter. And, how they interact to ensure accurate and reliable flow measurement, even in difficult conditions.
Flow Range and Direction
If, once the flow meter has been mounted, the flow reading is opposite or negative to the flow reading expected, the flow sensor can be corrected by parameter adjustment in the transmitter.
The Rheonik flow sensor range is one of the most expansive available. With line size connections from ¼” to 12”, the range of flow covered is second to none. Calibrated to perform with uncertainties down to 0.1% of the rate, Rheonik Omega design sensors provide precise and reliable measurements in thousands of applications around the world.
Line Size Options
A wide range of process connections is available to suit most applications. Where a special fitting or weld-in-place is required. Pheonix can provide engineering services and custom design the right inlet/outlet arrangement for your needs.
Material Options and Pressure Ratings
A range of wetted materials is offered as standard, each with its own set of pressure ratings depending upon line size. Custom material
Rheonik offers a wide range of wetted materials to suit a multitude of applications. The unique design of the Rheonik Omega Tube Coriolis meter allows many other materials to be used as a custom service. For applications with specific needs. Contact us with your requirements.
Only Rheonik offers so many different process connections as standard. The versatile design of the Rheonik Omega tube meter provides a perfect platform for customization and specialization. When sizing a meter, don’t consider the process connection size as the primary requirement.
Rheonik mass flowmeters can be fitted with a larger fitting. So, select a meter based on your required flow range first for the best possible performance. Contact us for your specific requirements.
Upstream/Downstream Straight Run Requirements
For sensor models RHM 30 to 160 manufactured with a parallel tube, seal-less construction type,
straight pipe sections of 5-10 pipe diameters upstream and 3-4 pipe diameters downstream should be provided where flow is connected to the meter out of a plane with the sensor meter tubes.
This is required to avoid different flow velocities being established within the two measuring tubes. No valves or reducers should be installed between the pipe mounting supports and the sensor.
Horizontal Pipe Mounting
The location and orientation of a sensor in line is application dependent although whenever
possible, installation of an RHM sensor is preferred in a horizontal pipeline.
- Liquid applications: For liquid measurements, the RHM sensor should be installed at a low point in the pipe system with its measurement tubes pointing downwards as this will prevent gas bubbles from collecting in the sensor. The presence of gas bubbles can reduce the performance of the sensor for both mass flow and density.
- Liquid applications with solid particles in the fluid: If there is a risk that the liquid contains (heavy) solid particles, the RHM sensor should be installed at a high point in the pipe system with its measuring loops pointing upwards to avoid the collection of the particles in the sensor.
- Gas applications: For gas measurements, the RHM sensor should be installed at a high point in the pipe system with its measuring loops pointing upwards to avoid condensation or other liquids collecting in the sensor.
It is recommended to install RHM flow sensors with rigid supports at both the inlet and outlet. The supports should be placed apart at a distance of no more than three times the width of the sensor housing.
Robust supports are needed for large, heavy sensors to protect the mechanical integrity of the pipe. Avoid heavy shocks to the RHM flow meter at any time
Vertical Pipe Installation
Installation of an RHM sensor in a vertical pipe (“flag” installation) is only recommended for pure liquids without gas and solid particles and for dry, non-condensing gases. Due to the internal arrangement of the tubes within the meter, there is the possibility that for low-flow liquid installations, gas bubbles and/or solids may accumulate in the meter. For low-flow gas installations, there is a possibility that some liquids may accumulate in the meter.
- For liquid applications with possible gas content, the flow should be upward through the meter to
assist in purging and removing accumulated gas from the meter.
- Liquid applications with possible content of solid particles should be avoided.
- For gas installations, the flow should always be downwards through the meter.
When putting the meter into service, it is important to ensure that it is filled. To achieve this, a relatively high flow should be introduced to the meter to purge unwanted liquid or gas
The capacity of the Rheonik RHM Coriolis flow sensor
|MODEL||QMIN||QMAX||Q NOM||P MAX @ 120°C||THE TYPICAL SIZE OF THE PROCESS CONNECTION|
|kg/ min||kg /min||kg/min||bar(g)||thread||flange|
|RHM 015||0.002||0.6||0.6||700||1/4″||DN15, 1/2″|
|RHM 03||0.038||5||5||870||1/4″||DN15, 1/2″|
|RHM 04||0.05||10||10||870||1/4″||DN15, 1/2″|
|RHM 06||0.15||20||20||510||1/2″||DN25, 1″|
|RHM 08||0.3||50||50||1,185||1/2″||DN25, 1″|
|RHM 12||0.75||100||75||960||3/4″||DN25, 1″|
|RHM 15||1||200||150||815||3/4″||DN40, 1 1/2″|
|RHM 20||2.25||300||300||700||1″||DN50, 2″|
|RHM 30||5||750||600||700||—||DN80, 3″|
|RHM 40||12.5||1,500||1,250||290||—||DN80, 3″|
|RHM 60||45||3,000||2,500||430||—||DN100, 4″|
|RHM 80||130||8,000||5,000||215||—||DN150, 6″|
|RHM 100||200||12,000||10,000||150||—||DN200, 8″|
|RHM 160||600||30,000||23,000||50||—||DN300, 12″|
The types and capacities of the Coriolis Mass flow meters
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
Medium Size Coriolis Mass Flow Sensor
Suited to industrial and process flow control and monitoring
Large Size Coriolis Mass Flow Sensor
Perfect for material movements in small and wide-scale operations
The transmitter provides the drive energy for maintaining tube vibration within the sensor, processes and evaluates the measured signals, and calculates mass flow along with other parameters. When used with an RHMxxx sensor in a hazardous area, the RHE is equipped with the necessary safety barriers as required by local regulations.
A detailed description of transmitter features is available in each of the RHExx data sheets
Whether an end-user or a system builder, Rheonik has a transmitter option that will meet your needs. Depending upon your needs, the process transmitter range has fully featured multi-function units for safe areas and hazardous area use or mass flow-only units. System builders and OEM customers will find low-cost, small-footprint high-performance options in our OEM range.
The types of Coriolis Mass Flow Transmitter
- Rheonik RHE16 Coriolis mass flow transmitter Compact Multifunction
- Rheonik RHE15 Profibus DP Module
- Rheonik RHE21 explosion-proof field mount Mass Flow Transmitter
- Rheonik RHE 26 Coriolis Mass Flow Transmitter
- Rheonik RHE 27 Coriolis mass flow transmitter
- Rheonik RHE28 Field / Wall Mount Coriolis mass flow transmitter
- Rheonik RHE45 Compact Mount Coriolis Mass Flow Transmitter
- Rheonik RHE42 Coriolis Mass Flow Transmitter
For information Price, stock and other please contact: WMA
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