『How Does a Micro Motion Flow Meter Work: Splits fluid into twin vibrating conduits, interpreting the exact phase shift caused by the Coriolis effect into mass measurements.』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
How Does a Micro Motion Flow Meter Work
Quick Answer: A Micro Motion flow meter splits the process fluid into twin vibrating conduits. The Coriolis effect creates a phase shift between the inlet and outlet sides when mass flows through those conduits. The transmitter reads that phase shift and converts it into a direct mass flow measurement in kg/h.
What Happens Inside the Twin Tubes
The sensor body contains two parallel tubes. A drive coil excites both tubes at their natural frequency. Fluid enters the meter and splits into the two conduits. The tubes vibrate in opposition. With zero flow, the inlet and outlet sides move in phase. With flow, the Coriolis effect creates a time difference at the pickoff sensors. The transmitter records that time difference as a phase shift.
Here is the thing. The tubes do not move much. The vibration amplitude is often under 1 mm. The signal is small. So the signal processing matters as much as the tube design. Silver Instruments pairs the sensor with a transmitter that reads phase shift, density, and temperature.
Why Phase Shift Converts to Mass Flow
Because density changes with composition, a volume meter would need a correction factor. A Coriolis meter does not. It measures mass directly. The phase shift is proportional to mass flow rate. Tube frequency gives density. A built in PT100 gives process temperature. One device sends mass flow, density, and temperature over 4-20 mA HART.
In practice, a chemical plant in Thailand uses a DN25 Silver Instruments Coriolis meter on a reactor feed line. The fluid density changes from 0.78 kg/L to 0.93 kg/L across batches. Mass flow stays accurate because the meter does not need volume correction. The meter also ignores fluid conductivity in µS/cm, unlike electromagnetic flow meters.
Installation and Sizing That Most Engineers Skip
Most engineers skip this part during early sizing. The meter needs a full pipe. No gas pockets. No slug flow. Install it so the tubes stay flooded during shutdown. In vertical lines, flow should go upward. In horizontal lines, keep the meter below the pipe if possible. Use a zero calibration after installation.
We have seen this on customer sites many times. A food plant in Malaysia installed a Coriolis meter directly after a piston pump. Pulsating flow created unstable readings at low flow. The fix was simple. We added a small back pressure valve downstream and moved the meter further from the pump discharge. Readings then settled within 0.1 percent of rate.
Where We See This Meter Used
This meter works in oil and gas, chemical, food and beverage, water and wastewater, and marine. We have supplied units for bunker fuel measurement, molasses batching, LPG m
A paint manufacturer in Vietnam asked us to replace an oval gear meter on a solvent line. The oval gear meter drifted after mechanical wear. A DN15 Silver Instruments Coriolis meter now handles 0 to 600 kg/h. The line runs at 4 bar and 30 °C. The meter body is stainless steel 316L and rated for ATEX Zone 1.
Recommended Silver Instruments Models
Use the SIL-CMF series for most mass flow jobs. DN15 covers 0 to 1000 kg/h. DN25 covers 0 to 5000 kg/h. DN50 covers 0 to 30000 kg/h. Pick a smaller line size if the flow range allows it. Smaller tubes give better low flow accuracy. For high viscosity fluids above 100 cP, keep pressure drop in check and tell us the viscosity in the quote request.
Need a quote now? Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h. We will propose a model and installation notes. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610.
Five FAQs
What does a Micro Motion flow meter actually output?
It outputs mass flow in kg/h, density in kg/L, and process temperature in °C. The signal can be 4-20 mA HART, pulse, or Modbus.
Does this meter work for gas?
Yes. Coriolis mass flow meters measure gas mass flow directly. Size the meter for the actual gas density. Low density gas needs a larger meter or higher flow velocity.
What pipe sizes does Silver Instruments offer?
We offer DN15 to DN150 as standard. Larger sizes are available on request. We also supply stainless steel 316L, Hastelloy, and PTFE lined options for corrosive fluids.
Can I install this meter in an ATEX Zone 1 area?
Yes. Many models come with Ex d or Ex ia approvals. Confirm the gas group and temperature class when you send the quote request.
How do I know if my flow range is too low?
Most engineers skip this part. If your minimum flow falls below 5 percent of the meter upper range, accuracy may drop. Send us your minimum and maximum flow. We will check the turndown.
This article was prepared by Silver Automation Instruments. We supply Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, and other process instruments from our facility in China to customers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. For a specific selection, send your pressure in bar, temperature in °C, pipe size in DN, and flow range. WhatsApp: +86-25-52155837. Tel: +86-25-68650347. Website: flow-meter.com.au
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