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Coriolis Flow Meter Working: Dynamic Micro-Vibration Senses Systems Sizing
Quick Answer: A Coriolis flow meter measures mass flow directly from the phase shift created by dynamic micro-vibration of the measuring tubes. Correct system sizing needs fluid type, density, viscosity, flow range, pressure, temperature, and pipe size. Send Silver Automation Instruments your fluid, pressure in bar, temperature in °C, pipe size DN, and flow range for a workable model selection.
How the Dynamic Micro-Vibration Working Principle Operates
A Coriolis flow meter drives one or two tubes at a known frequency. Most engineers skip this part. The dynamic micro-vibration is the small forward and backward motion of the tube. When fluid enters the tube, the inlet leg and the outlet leg vibrate out of phase. That phase shift is directly proportional to mass flow. The transmitter reads the phase shift and produces a signal in kg/h or t/h.
This direct mass flow measurement removes the need for separate pressure compensation on standard liquids. The tube also vibrates at a frequency that changes with density. The same meter reports density in kg/m³ and temperature from a built in PT100 sensor. A 4-20 mA HART output carries mass flow, density, and temperature to the control system.
Dynamic micro-vibration senses both mass flow and density in the same sensor system. System sizing then matches the sensor to real process conditions.
Why System Sizing Needs More Than DN
System sizing for a Coriolis flow meter is different from sizing a magnetic flow meter or a vortex flow meter. You cannot pick a meter only by DN. Viscosity, density, flow range, and pressure drop all affect the final tube selection. A DN15 meter can handle 30 kg/h of syrup at 25 cP. The same DN15 meter may drop too much pressure at 2000 kg/h of a heavier paste.
Silver Instruments offers Coriolis meters from DN15 to DN100 in standard models. Wetted parts include 316L stainless steel and Hastelloy C22 for aggressive chemicals. For a food grade CIP process, a DN25 meter with 316L wetted parts and Ra 0.8 µm surface finish is common. For crude oil custody transfer in the Middle East, we often size DN50 or DN80 meters with ATEX Zone 1 certification and 4-20 mA HART plus pulse output.
What Process Data We Use for Coriolis Sizing
We size every Coriolis flow meter from five data groups. The fluid and its density at operating temperature come first. Viscosity in cP or mPas is second. Minimum and maximum flow rate in kg/h or t/h is third. Operating pressure in bar and temperature in °C are fourth. Pipe size DN and flange standard are fifth.
Here is the thing. Minimum flow matters more than maximum flow in many chemical dosing jobs. A meter with a 20 to 1 turndown may still lose accuracy below 2 percent of nominal flow. We have seen this on customer sites many times. A paint manufacturer in Southeast Asia specified a meter for 1000 kg/h maximum flow. The actual night shift batch was 25 kg/h. That forced a smaller meter selection and a custom manifold.
In practice, you should also tell us about gas bubbles, solids, or pulsating pumps. A Coriolis flow meter can tolerate some viscosity change. A Coriolis meter ca
Typical Coriolis Meter Selections by Application
A desalination plant in Saudi Arabia needed antiscalant dosing at 5 to 50 kg/h. The brine carryover measured 68000 µS/cm, so the plant could not afford dosing errors. We selected a DN10 Coriolis meter with 316L wetted parts and 1/4 inch process connections. The meter gave 4-20 mA HART output to the plant PLC. The operator used the density output to verify the chemical batch concentration before dosing.
Last year a customer in Vietnam asked us for syrup flow in a beverage process. The fluid was 65 Brix syrup at 80 °C, 150 cP, with a flow range of 30 kg/h to 600 kg/h. We quoted a DN15 meter with PT100 temperature output and 4-20 mA HART. The meter also measured density to confirm the syrup ratio in real time.
For marine fuel measurement in Singapore, we supplied a DN50 Coriolis flow meter for bunkering skids. The unit handled heavy fuel oil at 380 cSt and 120 °C. The pressure rating was 16 bar. The transmitter used Modbus RTU to feed a custody transfer flow computer.
How to Ask for a Coriolis Flow Meter Quote
Silver Automation Instruments is a flow meter manufacturer and supplier for process plants in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. We keep standard DN15 to DN80 Coriolis meters in stock for fast delivery. Larger DN100 models are built to order.
Do not send a request like the unit price of a flow meter. That request wastes time because the meter may not fit your process. Send a short line with the fluid, pressure in bar, temperature in °C, pipe size DN, and flow range. For example: Liquid caustic soda 20 percent, 3 bar, 45 °C, DN25, 500 kg/h to 5000 kg/h. We can reply with a model, a price range, and a lead time within one working day.
Contact Silver Automation Instruments at Tel: +86-25-68650347. You can also reach us on Whatsapp: +86-25-52155837 or WeChat: +86 15365082610. Tell us your process data and ask for a Coriolis flow meter sizing review.
Coriolis Flow Meter Working FAQ
What is the main advantage of direct mass flow measurement? You get mass flow, density, and temperature from one device. No separate flow computer is needed for standard liquid mass balance.
Which fluids can a Coriolis flow meter handle? A Coriolis flow meter handles clean liquids, pastes, slurries, and some gases. Tell us the gas void fraction. Above 5 percent gas, accuracy drops fast.
Do I need to use a straight pipe upstream? No. Coriolis meters do not need the long straight runs that vortex or turbine meters require. You still need to avoid severe pipe strain and vibration.
What is the typical accuracy of a Silver Instruments Coriolis meter? Standard models give 0.2 percent of rate for mass flow and 0.5 kg/m³ for density. High accuracy models give 0.1 percent of rate.
Can the transmitter output density and concentration? Yes. The dynamic micro-vibration frequency is density dependent. The transmitter can output density in kg/m³ or concentration in percent. This is useful for syrup, paste, and chemical blending.
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