Flow Meters › Coriolis Flow Meters › Large Diameter Coriolis Flow Meter
Large Diameter Coriolis Flow Meter
A large-bore U-tube Coriolis flow meter for high-flow mass metering, sized DN80 to DN200 and carrying up to about 1,200 t/h. It reads mass flow, density, and temperature directly, holds 0.1% to 0.5% accuracy, and needs no straight pipe run, so it suits tanker and truck loading, custody transfer, and large process lines.
- Principle: Coriolis, vibrating tube; direct mass and density
- Size: DN3 to DN200
- Accuracy: 0.1% to 0.5% of rate; density ±0.002 g/cm³
- Output: 4-20 mA, pulse, RS-485 Modbus; HART option
- Rating: IP67; Ex d [ia] IIC T6 Gb
Overview
A large diameter Coriolis flow meter is a big-bore U-tube mass meter for high-flow duty. Sized DN80 to DN200, it carries up to about 1,200 t/h while still reading mass, density, and temperature directly from the Coriolis force on the vibrating tube, with 0.1% to 0.5% accuracy and no straight pipe run.
Because the reading is true mass and does not drift with pressure, temperature, or density, the large-bore U-tube is the reference for tanker and truck loading, custody transfer, and bulk movement of petroleum and chemical products. For small and medium flows, a standard Coriolis mass flow meter is the better fit; for self-draining sanitary or slurry service, see the straight tube Coriolis flow meter.
Features
Everything here follows from one fact: the meter weighs the flow instead of timing or counting it.
Direct mass measurement
It reads mass flow from the Coriolis force, so the result does not shift with pressure, temperature, or density.
0.1% to 0.5% accuracy
Class 0.1, 0.15, 0.2, and 0.5 are available, with a measurable ratio of 10:1 to 20:1.
Mass, density, temperature
One instrument outputs mass flow, working density to ±0.002 g/cm³, and medium temperature.
Hard fluids and slurries
It measures high-viscosity fluids, grouts, and suspensions that other meters struggle with.
No straight run, no moving parts
It needs no upstream or downstream straight pipe, and there is nothing inside the line to wear.
4-20 mA, pulse, RS-485, HART
An LED or LCD converter drives analog, pulse, and Modbus outputs, with HART on the LCD models.
Working principle
The sensor holds one or two measuring tubes that a drive coil vibrates at their natural frequency. With no flow, both halves of the tube vibrate in step. When fluid flows, each moving mass element resists the change in its direction of motion, and that reaction is the Coriolis force. It acts in opposite directions on the inlet and outlet halves of the tube, so the tube twists, and the two halves move out of step. Position detectors at each end measure this phase, or time, difference. The phase difference is directly proportional to the mass flow rate, while the natural frequency of the tube shifts with the fluid density, so the meter derives both from the same vibrating tube. Sensors from DN20 to DN200 use a U-tube structure; DN3 to DN15 use a compact triangular structure.
Technical specifications
| Parameter | Specification |
|---|---|
| Measurement principle | Coriolis, vibrating tube; direct mass flow, density, temperature |
| Sensor structure | U-tube (bent) structure; large-bore sizes for high flow |
| Size | DN80 to DN200 for high flow (full range from DN15) |
| Flow capacity | To about 1,200 t/h on the largest bore (180 t/h at DN80, 300 t/h at DN100, 360 t/h at DN150) |
| Accuracy (mass, liquid) | Class 0.1, 0.15, 0.2, 0.5 (% of rate) |
| Turndown | 10:1 to 20:1 |
| Density measurement | 0.3 to 3.000 g/cm³, accuracy ±0.002 g/cm³ |
| Temperature measurement | -200 to 350 C, accuracy ±1 C |
| Medium temperature | Standard -50 to 200 C; high-temp -50 to 350 C; low-temp -200 to 200 C |
| Ambient temperature | -40 to 60 C (LED), -20 to 60 C (LCD) |
| Working pressure | 0 to 4.0 MPa standard; to 30 MPa on request |
| Wetted material | Measuring tube 316L; housing 304 |
| Connection | Flange, sanitary clamp, or thread (DIN, ANSI, JIS, GB, HG) |
| Outputs | 4-20 mA (load ≥750 ohm) and 0 to 10 kHz pulse; pulse 0.05%, current 0.2% |
| Communication | RS-485 Modbus; HART on LCD models |
| Display | Two-row LED or three-row LCD; mass, volume, density, temperature, totalizer |
| Power | 18 to 36 VDC or 85 to 265 VAC; 7 to 10 W |
| Mounting | Integral or split (2 m signal cable) |
| Protection | IP67 |
| Explosion protection | Ex d [ia] IIC T6 Gb |
Flow ranges by size
The standard flow range is the value recommended for factory calibration and normal operation; the upper-limit range is the maximum for stable sensor operation. Working in the middle third of the standard range gives the best accuracy and the lowest pressure loss.
| Size | Standard flow (kg/h) | Upper limit (kg/h) |
|---|---|---|
| DN3 | 96 | 144 |
| DN6 | 540 | 810 |
| DN8 | 960 | 1440 |
| DN10 | 1500 | 2250 |
| DN15 | 3000 | 4500 |
| DN20 | 6000 | 9000 |
| DN25 | 9600 | 14400 |
| DN32 | 18000 | 27000 |
| DN40 | 30000 | 45000 |
| DN50 | 48000 | 72000 |
| DN80 | 120000 | 180000 |
| DN100 | 192000 | 300000 |
| DN150 | 360000 | on request |
Versions
The sensor and converter are configured to the fluid and the duty point:
- Standard. 316L tube, medium -50 to 200 C, working pressure to 4.0 MPa. The default for most liquids and gases.
- High-temperature. Medium to 350 C, for hot oil and other high-temperature service.
- Low-temperature. Medium to -200 C, for liquid nitrogen, liquid oxygen, and other liquefied gas.
- High-pressure. Working pressure to 30 MPa, for cementing and other high-pressure service.
- Insulation (heat-preserving). A jacketed sensor circulates steam or hot oil to keep media such as asphalt above their solidifying point.
The converter is integral with the sensor, or split with a 2 m cable where the medium is hot or the sensor is hard to read at.
Applications
The large-bore U-tube handles high-volume mass metering:
- Tanker, truck, and rail-car loading and unloading
- Custody transfer of crude, refined products, and chemicals
- Bulk transfer on large process and pipeline headers
- High-flow blending and batching by mass
- Density and concentration on large liquid streams
Application example
Challenge: A products terminal needed custody-grade mass totals on a DN150 truck-loading line running several hundred tonnes per hour.
Solution: A large-bore U-tube Coriolis meter was fitted at the loading arm, reading mass directly so the ticket did not depend on temperature or density correction.
Result: Loading was metered by mass at full rate, and the direct reading removed the volume-to-mass conversion that had caused disputes.
Related products
Coriolis Mass Flow MeterStandard U-tube and triangular builds, DN3 to DN200, for small and medium flows.
Straight Tube Coriolis Flow MeterSingle straight tube, self-draining, for CIP, slurry, and sticky media.
FAQ
What is a large diameter Coriolis flow meter?
It is a big-bore U-tube Coriolis mass flow meter, typically DN80 to DN200, built for high flow. It measures mass, density, and temperature directly and carries up to about 1,200 t/h.
How much flow can it handle?
Capacity rises with bore: roughly 180 t/h at DN80, 300 t/h at DN100, and 360 t/h at DN150, up to about 1,200 t/h on the largest sizes. Exact ranges depend on fluid and pressure drop.
Why use Coriolis for loading and custody transfer?
Coriolis reads true mass, so the ticket does not drift with temperature, pressure, or density and needs no volume-to-mass correction. That makes the large-bore U-tube a reference for tanker and truck loading and custody transfer.
Large bore or standard Coriolis?
Use a large diameter meter for high flow on big lines. For small and medium flows, a standard Coriolis mass flow meter is more accurate and lower cost; for sanitary CIP or slurry, use a straight tube Coriolis meter.
Request a quote
Send us the fluid, the flow range, the line size, and the temperature and pressure, and we size the sensor and set the converter outputs. Standard, high-temperature, low-temperature, high-pressure, and insulated builds are available.