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What is a Coriolis Flow Meter: Multi-Variable Oscillating Mass Processing Sensors
Quick Answer: A Coriolis flow meter measures mass flow directly. It also outputs density, volume flow, and temperature from the same sensor. Silver Instruments supplies these meters from DN15 to DN200 for oil and gas, chemical, food and beverage, and water treatment sites.
Direct Mass Flow Measurement Without Compensation
A Coriolis meter does not need external pressure or temperature compensation. The sensor measures mass in kg/h or t/h. You get a true mass reading even when fluid density shifts. This matters for bunker fuel, palm oil, molasses, and chemical solvents. For a seawater flow meter for desalination plant, the Coriolis sensor works well because brine density does not affect mass flow output. A desalination plant operator can read mass flow and density on one transmitter display. No separate density meter is required.
How Multi-Variable Oscillating Mass Sensors Work
The meter contains two oscillating tubes. A drive coil keeps the tubes vibrating. When fluid enters the tubes, the oscillation phase shifts. Two pickoff coils detect that shift. The phase shift is proportional to mass flow. The tube frequency changes with density. PT100 sensors measure fluid temperature. The transmitter processes all signals at once. This is why suppliers describe it as a multi-variable oscillating mass processing sensor.
In practice, the electronics are the hard part. Weak tube movement must be sampled fast. The transmitter filters noise and calculates live density from tube frequency. Most engineers skip this part. Just know that Silver Instruments transmitters output mass flow, density, temperature, and volume flow from one process connection.
Output Signals and Field Integration
Most Silver Instruments Coriolis meters use 4-20 mA HART output. Modbus RTU and pulse outputs are optional. The display can show mass flow in kg/h, volume flow in m3/h, density in kg/m3, and temperature in °C. ATEX Zone 1 and Zone 2 versions are available for gas processing and chemical storage. Use the digital output to feed a PLC, batch controller, or flow computer. On an oil and gas metering skid, the density signal also supports blending and custody transfer checks.
Where These Meters Earn Their Cost
Food and beverage plants use Coriolis meters for syrups, chocolate, yogurt, and flavor dosing. A dairy in Thailand may run a DN25 meter at 0 to 5000 kg/h. Chemical sites measure acids and solvents with PTFE or 316L wetted parts. Oil and gas terminals use them for bunker fuel and LPG. Water and wastewater plants use them for polymer dosing and chemical injection. Conductivity sensors in the same plant may show 1500 µS/cm, but a Coriolis meter measures mass flow independent of conductivity. We have seen cu
Last year a customer in Vietnam asked us for a DN50 meter to measure palm oil at 80 °C. The flow range was 0 to 8000 kg/h. We supplied a 316L sensor with high temperature seals. The meter has run without recalibration for over 14 months.
Sizing and Material Selection
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will check pressure drop, velocity, wetted material compatibility, and connection type. For example, a paint manufacturer in Southeast Asia asked for a DN15 meter for solvent flow at 2 bar and 25 °C. We recommended a 316L stainless steel sensor with FKM seals and 4-20 mA HART output. Viscosity above 100 cP is rarely a problem because the meter measures mass directly. Very low flow applications may need a smaller meter to keep the tube oscillation stable.
Coriolis flow meter price depends on line size, wetted material, and hazardous area certification. A small DN15 food grade meter costs less than a large DN100 ATEX Zone 1 model for gas service. Send your parameters and we will quote a meter that fits your process.
FAQ
What does a Coriolis flow meter measure?
A Coriolis meter measures mass flow directly. It also measures volume flow, density, and temperature. Some transmitters calculate concentration and net oil from those live values.
Can a Coriolis meter handle viscous fluids?
Yes. Because mass flow is measured directly, viscosity does not require a Reynolds number correction. Fluids above 100 cP such as syrups, oils, and polymers are common applications.
Which industries use Coriolis mass flow meters?
Oil and gas, chemical, food and beverage, water and wastewater, marine, and power plants use them. Typical fluids include fuels, solvents, brines, slurries, syrups, and chemical additives.
What output signals does a Silver Instruments Coriolis meter provide?
Standard output is 4-20 mA HART. Optional outputs include Modbus RTU, pulse, and digital switching. ATEX Zone 1 and Zone 2 versions are available for hazardous areas.
How do we select the right Coriolis flow meter size?
Send us your pipe size (DN), flow range, pressure, temperature, and fluid name. We check velocity and pressure drop. We then recommend a meter size and wetted material. For most sites, DN15 to DN100 covers the flow range. Large lines up to DN200 are also available.
Silver Instruments supplies Coriolis mass flow meters from DN15 to DN200. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range for a quote.
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