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2000 mPa.s Flow Meter Design for High-Viscosity Fluids
Quick Answer: Fluids with 2000 mPa.s viscosity need flow meters that do not restrict flow or suffer from shear. We recommend oval gear positive displacement meters or Coriolis mass flow meters for these thick media. Both types maintain accuracy below 0.5% even when the fluid is cold and sticky.
Why 2000 mPa.s Viscosity Changes Your Flow Meter Selection
At 2000 mPa.s, a fluid is thick like honey or heavy motor oil. Many standard meters fail here. Turbine meters develop huge measurement errors because the fluid drags on the blades. Differential pressure meters offer unstable readings as the fluid sticks to the orifice edges. Magnetic flow meters do not work because most high-viscosity fluids are non-conductive. You need a meter built for mechanical displacement or direct mass measurement.
We have seen this problem many times on customer sites. A paint manufacturer in Thailand ran a turbine meter on alkyd resin at 1900 mPa.s. The meter drifted by 5% on cold mornings. They replaced it with a Silver Automation Instruments oval gear meter. The reading stayed within 0.2% across the whole batch. The output went to a PLC via 4-20 mA HART. No more manual corrections.
Oval Gear Flow Meters for 2000 mPa.s Liquids
Oval gear meters belong to the positive displacement family. Two oval-shaped rotors turn inside a housing. Each pocket of fluid moves from inlet to outlet with zero slip. This direct capture of volume makes them ideal for viscous fluids. At 2000 mPa.s, the viscous liquid actually lubricates the gears and seals. Clearance is tight. Leakage is tiny. You get repeatable measurements from 5 cP up to 100,000 cP.
For a DN25 oval gear meter from Silver Automation Instruments, the typical range is 2 to 20 liters per minute with heavy oil. Accuracy stays at ±0.5% of reading. The output options include open collector pulse, 4-20 mA, or Modbus RTU. You can add a PT100 temperature sensor to the meter body. Temperature helps you convert volume to standard conditions if the fluid density shifts with heat. In a lubricant blending plant in Indonesia, the operator uses a DN15 oval gear meter at 1800 mPa.s and 60°C. The meter has been in service for three years without a rebuild.
Coriolis Mass Flow Meters Handle 2000 mPa.s Without Sacrificing Accuracy
Some engineers worry that a Coriolis meter will dampen too much at high viscosity. In practice, a well-designed Coriolis driver compensates for the extra damping. Silver Automation Instruments uses a digital drive system that measures the tube oscillation and adjusts energy in real time. This keeps the meter vibrating even in thick syrups or adhesives. You get direct mass flow, density, and temperature from a single device. No need to measure volume and then correct for temperature.
A customer in Mexico produces corn syrup at 2000 mPa.s. They installed a DN10 Coriolis meter from us. The flow range is 30 to 600 kg/h. Density output confirms the syrup concentration. Because the meter has no moving parts in the flow path, cleaning-in-place (CIP) cycles do not damage it. The wetted parts are 316L stainless steel. The meter meets ATEX Zone 1 for safe use in solvent-laden air. Tube frequency stays stable even when viscosity jumps from 1000 to 2500 mPa.s between batches.
Temperature and Pressure: What You Need to Specify
Viscosity depends heavily on temperature. A fluid at 2000 mPa.s at 25°C might drop to 500 mPa.s at 70°C. You must tell us your operating temperature. This affects the meter internal clearances and the choice of materials. For oval gear meters, we use hard carbon bearings for high-temperature services. For Coriolis meters, the tube stiffness changes with heat. Our factory calibrates each meter at a set temperature range. If you supply the expected °C, we can adjust.
Pressure is also key. High-viscosity fluids often ru
Installation Tips for 2000 mPa.s Flow Meter Loops
Place the meter as close as possible to the pump. Long unheated lines create cold spots where viscosity skyrockets. Use heat tracing and insulation if the ambient temperature drops below 10°C. Direct the flow vertically upward through an oval gear meter. This avoids air pockets that break the gear sync. Coriolis meters should be mounted so the tubes fill completely. Avoid drains right after the meter. A small back-pressure valve helps keep the meter liquid-full during starts and stops.
We also recommend a strainer with a mesh size of 100 microns upstream of the oval gear meter. Hard particles can score the rotors. In a chocolate factory in Australia, a missing strainer let a piece of hard cocoa shell enter a DN20 meter. The repair cost was more than the strainer would have been. After fitting a Y-strainer, the meter ran trouble-free for two years.
Specifications at a Glance
Here are the typical capabilities when you request a flow meter for 2000 mPa.s fluids from Silver Automation Instruments. Output signals include 4-20 mA, pulse, RS485 Modbus, and HART. Power supply is 24 V DC. Enclosure options reach IP65 or IP68. Explosion-proof certifications cover ATEX, IECEx, and NEPSI for Zone 1 applications. Wetted materials range from 316L to Hastelloy C for corrosive thick media. Turndown ratio exceeds 10:1 for oval gear and 20:1 for Coriolis. Repeatability is better than 0.1%.
Get a Recommendation for Your Process
Send us your fluid viscosity (cP or mPa.s), temperature (°C), pipe size (DN), flow range, and operating pressure. We will propose a specific meter model with a data sheet and quotation within one business day. Email your specs to [email protected] or fill the form on our contact page. We ship to Thailand, Indonesia, Vietnam, Mexico, Saudi Arabia, and many other countries where thick liquids are part of daily production. Ask for a reference in your industry. We can share a case study under NDA.
Frequently Asked Questions
Q: Can a magnetic flow meter measure fluid with 2000 mPa.s viscosity?
A: Only if the fluid is conductive. Most high-viscosity liquids like oils, resins, or syrups are non-conductive. A magmeter will read zero. Stick to oval gear or Coriolis.
Q: What is the smallest size for a high-viscosity flow meter?
A: We offer DN2 for both oval gear and Coriolis meters. These tiny meters measure flows as low as 0.1 liters per hour. Great for pilot plants and additive dosing.
Q: Does the meter need heating when the fluid is 2000 mPa.s?
A: If your fluid can solidify or thicken further at low temperatures, yes. Use a heated meter body or keep the meter in a warm enclosure. Ask us about jacket options.
Q: How do you calibrate the meter for a specific thick fluid?
A: We can calibrate on a test bench using a fluid of similar viscosity. If you cannot supply the fluid, we substitute with a certified oil of matching cP. The calibration certificate follows ISO 17025.
Q: What maintenance does an oval gear meter require at 2000 mPa.s?
A: Very little if the fluid is clean and lubricating. Inspect the filter every three months. Check the gear rotation smoothness once a year. If the fluid has abrasives, use ceramic bearings. We supply spare gear sets.
Silver Automation Instruments, flow meter manufacturer for high-viscosity fluids. No shortcuts, just the right meter for the job.
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