Coriolis Mass Flow Meter — BF80
BF80 Coriolis mass flow meter directly measures mass flow, medium density and temperature in one device — no pressure or temperature compensation needed. Works on liquids, gases and some two-phase flows and is widely used for custody-transfer metering. Ex d ia IIC T6 Gb rated; hygienic clamp versions for food and pharma.
Specifications
| Liquid mass accuracy | ±0.10% ~ ±0.50% (by size) |
| Liquid repeatability | 0.05% – 0.25% |
| Density accuracy | ±0.002 g/cm³ |
| Temperature accuracy | ±1 °C |
| Gas mass accuracy | ±0.50% ~ ±0.75% |
| Turndown | Standard 20:1 (widened on special conditions) |
| Temperature range | -70~+160 °C; cryogenic -200~+60; high-temp -40~+300 |
| Pressure | Standard 4.0 MPa; high-pressure up to 25 MPa |
| Output | 4–20mA, pulse, HART, Modbus |
| Ex rating | Ex d ia IIC T6 Gb |
| Connections | Plate/slip-on/weld-neck flanges; hygienic clamp (food & pharma) |
| Measures directly | Mass flow + density + temperature (no compensation) |
Details
Working Principle
An excitation coil drives the measuring tube to vibrate at high frequency. As fluid flows through the vibrating tube, the Coriolis force creates a phase difference between the inlet and outlet sides; the phase difference is proportional to the mass flow. At the same time the tube resonance frequency changes with medium density (density output), and a built-in platinum RTD measures medium temperature.
Performance
Liquid duty: mass accuracy ±0.10%~±0.50% (by size); repeatability 0.05%–0.25%; density ±0.002 g/cm³; temperature ±1 °C. Gas duty: mass accuracy ±0.50%~±0.75%; repeatability 0.25%–0.35%. Turndown standard 20:1. Temperature: −70~+160 °C general, −200~+60 °C cryogenic, −40~+300 °C high-temperature. Pressure: 4.0 MPa standard, 25 MPa high-pressure. Ex d ia IIC T6 Gb.
Advantages / Selection notes
Advantages: direct mass flow — unaffected by temperature, pressure, viscosity; outputs mass, density and temperature at once; measures high-viscosity liquids and some gas-liquid two-phase flow; no blocking parts in the measuring tube. Limitations: relatively expensive; sensitive to pipe vibration; small-bore mass flow is small and large-bore instruments are heavy. Selection: priority for liquid/gas trade metering; use anti-vibration supports; media that crystallize or foul will coat the vibrating tube and affect accuracy.