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Overcoming Viscosity Challenges with a Coriolis Effect Flow Meter
Quick Answer: A Coriolis mass flow meter measures true mass flow and ignores fluid viscosity. You do not need recalibration or correction factors when you move from water to heavy syrup. Silver Automation Instruments supplies meters that hold 0.15% accuracy on fluids over 30,000 cP without extra setup.
Why Viscosity Wrecks Common Flow Meters
Turbine meters and vortex meters depend on velocity profiles. Viscosity changes the profile shape and the meter reads wrong. Positive displacement meters can pump thick fluids but mechanical parts wear fast. Differential pressure meters need Reynolds number compensation. A refinery in Thailand had this problem with heavy fuel oil. In the morning the oil was warm at 180 cP and the turbine meter measured 8200 kg/h. At night the fuel cooled, viscosity jumped to 750 cP, and the same meter showed 7200 kg/h while the actual flow stayed the same. A 12% under-registration repeated every shift.
Many engineers think viscous fluids need a special meter type. In practice, you only need a meter immune to viscosity shift. That is where Coriolis technology steps in.
How a Coriolis Meter Sidesteps Viscosity
Coriolis meters vibrate one or two measuring tubes. Mass flow creates a phase shift between the inlet and outlet ends of the tube. The meter detects that phase shift directly. No velocity profile correction, no Reynolds number table. Viscosity does damp the tube vibration a small amount, but the transmitter algorithm handles that damping automatically. You get mass flow, density, and temperature from one sensor head.
Here is the thing. Oval gear meters can handle peanut butter or chocolate syrup, yet if the viscosity varies during a batch, the gear slip error changes. A Coriolis meter does not care. We have seen this on customer sites many times. A candy factory in Indonesia ran chocolate syrup at 35,000 cP and 80 °C. They first tried a magnetic flow meter but the syrup had too-low conductivity. Then they used a positive displacement meter. Gear wear caused accuracy drift every two months. Silver Instruments recommended a DN25 Coriolis meter with built-in PT100 and 4-20 mA HART. Accuracy measured 0.12% on test runs and stayed there for two years with zero recalibration. The plant now runs five lines with the same model.
Real Case from the Middle East: Polymer Melt
A chemical plant in Saudi Arabia needed to measure a melted epoxy resin at 8400 cP and 140 °C. Pipe size was DN20. The old gear meter could not survive the high temperature without frequent seal failures. We supplied a DN15 Coriolis meter with an Ex db IIC T6 housing for ATEX Zone 1. The sensor tubes have a PTFE lining for chemical r
Because the fluid set fast at room temperature, the startup procedure flushed the tubes with a solvent. The Coriolis meter density output confirmed the solvent was fully displaced before the production batch. No extra sensor was needed.
How to Specify a Coriolis Meter for Sticky Fluids
Most engineers skip the pressure drop calculation. A tube bore too small creates high velocity and pressure loss above 1 bar. For fluids above 2000 cP, we recommend limiting pressure drop to 0.5 bar. If your adhesive is 5000 cP and you need 2000 kg/h, choose a DN40 meter instead of DN25. This avoids cavitation and pump overload.
Silver Automation Instruments offers tube diameters from DN3 to DN200. Standard transmitters deliver 4-20 mA HART, scalable pulse, and RS485 Modbus RTU. For hazardous areas we provide ATEX or IECEx certified housings up to Zone 1. The integrated PT100 temperature sensor gives online density compensation. When you send us your process data, we calculate a recommended model and turndown ratio, then reply with a price.
Frequently Asked Questions
Can a Coriolis meter handle fluids over 10,000 cP?
Yes. We have units running on fluids up to 50,000 cP with no accuracy drift. The tube vibration amplitude is factory-set to accommodate high damping levels.
Does high viscosity reduce the usable flow range?
It can, due to pressure drop limits. We select the tube diameter to keep your turndown ratio at 20:1 or better. You get the same wide range as on thin fluids.
What signals does the transmitter offer?
Standard: 4-20 mA with HART, scalable open collector pulse, and RS485 Modbus RTU. Optional: Profibus DP and Foundation Fieldbus.
How often do I need to recalibrate in viscous service?
Very rarely. The Coriolis principle does not drift with viscosity. Most users check the zero point once a year. In clean service loops, meters run five years without adjustment.
How do I get a price for my high-viscosity application?
Send us your fluid name, viscosity (cP), density (kg/m³), operating temperature, pipe size (DN), and minimum plus maximum flow rate (kg/h). We will propose a model, a price, and a lead time the same day.
Email: [email protected] | Tel: +86-135-1213-1526 | Whatsapp: 86-135-12131526 | WeChat: +86 13512131526. Tell us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We respond to parameter-based inquiries within one business day.
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