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Coriolis Flow Meter Working Principle Animation: Oscillating Phase Shift Senses Mass Flow
Quick Answer: A Coriolis flow meter measures mass flow directly. The working principle animation shows a tube oscillating at its natural frequency. When fluid flows, the inlet side and outlet side produce a small phase shift. That phase shift is proportional to mass flow in kg/h or lb/min.
Engineers often ask us for a simple Coriolis flow meter working principle animation. Most animations start with a U-shaped or straight tube. The tube oscillates at its natural frequency. A drive coil keeps that oscillation steady.
When no fluid moves through the tube, the inlet and outlet sensor signals are in phase. The pickup coils at both ends see the same sine wave timing. That is the zero flow condition. Silver Instruments uses this reference point during factory calibration.
When process fluid enters the tube, mass flow changes the vibration pattern. The tube on the inlet side starts moving slightly ahead of the tube on the outlet side. This is the oscillating phase shift. It is measured in microseconds or degrees.
The phase shift value is small. On a DN15 meter at 1,000 kg/h water flow, the shift may be only a few milliseconds. Signal processing inside the transmitter converts that shift into mass flow, density, and temperature.
Density measurement uses the natural frequency of the tube. Temperature measurement uses a PT100 sensor built into the tube wall. So one Coriolis meter gives three process variables.
Here is the thing. A Coriolis meter does not need pressure and temperature compensation for mass flow. That makes it different from vortex or differential pressure meters.
In practice, we see Coriolis meters used for batching edible oil in Malaysia, fuel oil dosing in Vietnam, and caustic soda transfer in chemical plants in the Philippines. A paint manufacturer in Southeast Asia recently replaced three oval gear meters with one Coriolis meter. The reason was simple. The paint recipe changed often. The Coriolis meter handled viscosity from 20 cP to 5,000 cP without mechanical wear.
What the Animation Actually Shows
Most working principle animations hide the drive coil, the two sensor coils, and the DSP inside the transmitter. The phase shift is measured 10,000 times per second on some models. That sample rate is why the meter can catch fast batch changes. Most engineers skip this part, but it matters for dosing applications under 2 seconds.
Because the tube oscillates in phase at zero flow, the control loop can detect very small changes. The sensor coils are mounted at the inlet and outlet legs. They generate sine wave signals. The transmitter compares the two signals in real time.
Why Phase Shift Matters for Mass Flow Measurement
The phase shift is not the same as vibration amplitude. Many low cost flow meters measure amplitude, which changes with gas bubbles or pipe vibration. A Coriolis meter uses phase timing, so it is less sensitive to those outside disturbances. That is one reason process engineers trust Coriolis meters for critical batching and custody transfer.
Typical Applications and Pipe Sizes
Silver Instruments supplies the CMF series Coriolis mass flow meter. Typical sizes range from DN10 to DN150. Wetted parts are 316L stainless steel. For aggressive chemicals, Hastelloy C22 is available. Output options include 4-20 mA HART, pulse, and RS485 Modbus. ATEX Zone 1 certification is available for hazardous areas. Accuracy is ±0.1% to ±0.2% of rate for liquids.
A DN25 Coriolis meter from Silver Instruments handles 0 to 3,000 kg/h for water at 20 °C. Process pres
For seawater desalination plants, we often quote a DN50 Coriolis meter for chemical dosing of antiscalant. For a natural gas line in Oman, a DN40 meter with 40 bar rating measures compressed natural gas mass flow. We have seen many customer sites in Australia using Coriolis meters for molasses and whey concentrate. These fluids are sticky and non-conductive, so electromagnetic meters are not a good fit.
Installation and Commissioning Notes
Install the meter with no pipe stress. Use supports on both sides. For liquids, the meter can be installed in any orientation. For gas service, mount the meter with flow upward or horizontal. We have seen customer sites in Oman where vibration from nearby pumps caused a zero shift. A simple pipe support solved it.
Before startup, purge the meter and check for air pockets. Zero calibration should be done with the meter full of process fluid at operating temperature and pressure. That step takes less than five minutes on the Silver Instruments CMF series transmitter.
Recommended Coriolis Flow Meter Models
For small batch dosing, choose the CMF015-DN15 model. It works well for flow rates from 0 to 1,000 kg/h. For medium lines, the CMF025-DN25 or CMF050-DN50 models cover most liquid and gas batching needs. For larger custody transfer or loading skids, the CMF080-DN80 and CMF100-DN100 models handle flow up to 120,000 kg/h depending on fluid density.
Each meter comes with a factory calibration certificate. We can also supply an optional local display, Modbus RTU, and Ethernet IP output. The standard transmitter enclosure is IP67. For offshore or marine use, we can quote IP68 or stainless steel enclosure options.
FAQ
What does the oscillating phase shift actually sense?
The phase shift between the inlet and outlet sensor signals is directly proportional to mass flow. The transmitter measures the time shift in microseconds and converts it to kg/h or lb/min.
Can I use a Coriolis meter for gas?
Yes. Silver Instruments supplies Coriolis meters for compressed air, natural gas, and process gas. You need to specify gas density and pressure because gas mass flow may be low.
What accuracy can I expect?
Standard accuracy is ±0.1% to ±0.2% of rate for liquids. Some models reach ±0.05% with special calibration. Silver Instruments provides a factory calibration certificate.
Do I need straight pipe runs?
No. Coriolis meters do not need long upstream or downstream straight pipe. That saves space compared to vortex or electromagnetic flow meters.
Which industries use the Silver Instruments Coriolis meter?
We supply chemical, food and beverage, oil and gas, water and wastewater, marine, and pharmaceutical customers across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
Contact and Quotation Details
Need a quote? Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will reply with a Coriolis flow meter model and price.
Contact Silver Instruments today. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. We serve flow meter distributors and industrial end users across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
For a faster quote, tell us your fluid name, viscosity in cP, density in kg/m³, and process pressure in bar. We can confirm the right CMF series Coriolis meter within one working day.
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