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How Does a Micro Motion Flow Meter Work: High Precision Technology
Quick Answer: A micro motion flow meter uses the Coriolis principle to measure mass flow directly. One or two tubes vibrate at a known frequency, and fluid inertia creates a phase shift. The meter converts this phase shift into mass flow, density, and temperature signals without any moving parts.
What Is a Micro Motion Flow Meter
A micro motion flow meter is a type of Coriolis mass flow meter. Many engineers call it a micro motion meter because the measuring tubes are small and vibrate at high frequency. Silver Automation Instruments supplies these meters for liquid and gas service from DN2 up to DN200. The meter measures mass directly, not volume. This matters in process control because mass does not change with temperature or pressure.
How the Coriolis Principle Works
The meter has one or two flow tubes inside a sensor housing. A drive coil makes the tubes oscillate at their natural frequency. When fluid enters the tubes, it accelerates with the tube motion on the inlet side and decelerates on the outlet side. This creates a phase shift between the inlet and outlet sensor pickoffs. The phase shift is proportional to mass flow. No flow means no phase shift. More mass flow means a larger phase shift.
Because the meter measures inertia, it does not care about fluid type. It works on conductive and non conductive liquids, pastes, slurries, and compressed gases. You do not need pressure and temperature compensation. The meter also measures density from the vibration frequency. Temperature is measured with a built in PT100 sensor.
High Precision Technology in the Meter
Most Silver Instruments micro motion flow meters have a mass flow accuracy of 0.1 percent to 0.2 percent of rate. Density repeatability can reach 0.0002 g/cm3. This level of precision helps in dosing, blending, and custody transfer. The sensor uses digital signal processing. The transmitter filters noise from pump vibrations and pipe pulsations.
Here is the thing. A cheap flow meter may drift after a few months. We have seen this on customer sites in Vietnam and Thailand. The sensor loses zero stability. Our transmitters include zero calibration routines and diagnostic registers. You can read these registers over HART or Modbus RTU.
Key Specifications and Output Signals
Pipe sizes start at DN2 for very low flow dosing and go up to DN200 for bulk transfer. Standard process connections include tri clamp, flange, and threaded options. Wetted materials are 316L stainless steel, Hastelloy C22, or titanium. Pressure ratings depend on the process connection. Typical ratings are PN40 to PN100. Fluid temperature range is -50 degrees Celsius to 200 degrees Celsius.
The transmitter outputs 4-20 mA HART as standard. Pulse output for totalizing and Modbus RTU are also available. Some models support density output as a second 4-20 mA signal. This matters for two phase flow detection. You can detect air slugs in a food product or a pump cavitation event.
Where Micro Motion Flow Meters Work Best
These meters are not the che
Common applications include liquid chemicals, solvents, inks, palm oil, molasses, syrups, and dairy products. Gas applications include LPG, natural gas, and carbon dioxide. Desalination plants in the Middle East use micro motion meters for antiscalant dosing. Australian food producers use them for flavor and additive injection.
We have supplied meters for a biodiesel blending skid in Indonesia. The customer needed 0.2 percent mass flow accuracy for methanol and palm oil. They also required ATEX Zone 1 certification. Silver Automation Instruments provided calibrated meters with stainless steel housings and explosion proof transmitters.
How to Specify a Micro Motion Flow Meter
Send us your pipe size in DN, fluid type, flow range in kg/h, operating pressure in bar, and operating temperature in degrees Celsius. Tell us if you need ATEX or IECEx approval. This information helps our engineers select the right tube material and transmitter.
Do not just ask for a price. In practice, a micro motion flow meter quote depends on process connection, wetted material, transmitter type, and hazardous area certification. A DN15 meter for a food plant in Australia may cost more than a DN50 meter for a water skid in Kenya. Why? Because hygienic connections and electropolished tubes add cost.
Please contact Silver Automation Instruments for a specific quotation. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610. Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range in kg/h.
FAQ
Q: What is the difference between a micro motion flow meter and a standard Coriolis flow meter?
A: The terms often refer to the same working principle. Micro motion usually points to small tube Coriolis meters used for low flow or high precision dosing. Standard Coriolis meters can cover larger line sizes.
Q: Can a micro motion flow meter measure gas?
A: Yes. It can measure gas mass flow within its specified range. You need to consider gas density and pressure drop. A larger flow tube may be needed for low density gas.
Q: Does the meter need straight pipe runs?
A: No. Micro motion flow meters do not require long straight pipe runs. They are less sensitive to flow profile than electromagnetic or vortex meters.
Q: What maintenance does a micro motion flow meter need?
A: There are no moving parts. Maintenance is mostly zero verification and cleaning of the tubes if coating forms. Diagnostics help detect coating or erosion.
Q: What flow range can Silver Automation Instruments cover?
A: We cover pipe sizes from DN2 to DN200. Flow ranges depend on fluid density and tube design. Send us your fluid type and flow range in kg/h for a selection.
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