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Brand: Rosemount
Rosemount 3814 4-Path Liquid Ultrasonic Flow Meter
Description
A full-bore liquid ultrasonic meter for custody transfer of hydrocarbons
The Rosemount 3814 is a 4-path, transit-time liquid ultrasonic flow meter designed for custody transfer of liquid hydrocarbons in accordance with API Chapter 5.8 and OIML R117. Pulses are sent in four parallel planes, and the difference between downstream and upstream transit times is proportional to fluid velocity. The full-bore spool piece has no moving parts and no incremental pressure drop, which Emerson says reduces maintenance and energy costs, and the non-wetted transducers are field replaceable. It supports bidirectional flow, a wide flow range, and an archive data log with hourly and daily information on 3810 Series Electronics.
Technical specifications
| Parameter | Specification |
|---|---|
| Measurement | Transit time, full-bore spool piece, 4-path (eight transducer) chordal design |
| Linearity | ±0.15 % of measured value over 1.2 to 12.2 m/s; ±0.20 % over 0.6 to 12.2 m/s (optional) |
| Uncertainty of meter factor | Below ±0.027 % (API MPMS Chapter 5 Section 8, Table B-1) |
| Velocity range | 0.6 to 12.2 m/s; extended 0.3 to 14.6 m/s |
| Line sizes | DN100 to DN600 (4 to 24 in.) |
| Operating pressure | 0 to 155 bar (0 to 2,250 psig) |
| Product temperature | Standard -50 to 100 °C; optional -50 to 150 °C |
| Flanges | Raised face and RTJ, PN 20, 50, 100, 150 (ANSI 150, 300, 600, 900); higher ratings on request |
| Body materials | Cast ASTM A352 LCC, A351 CF8M/CF3M, A995 4A duplex; forged A350 LF2, A182 F316/F316L, F51, A105 |
| Transducers | 316L housing with proprietary matching layer; Inconel optional; NBR O-ring standard |
| Electronics | 3810 Series; 10.4 to 36 VDC, 8 W typical, 15 W maximum; optional LCD |
| I/O | RS-232/RS-485 Modbus, Ethernet Modbus TCP, three frequency/digital outputs, two 4-20 mA inputs and two outputs (HART 7) |
| Electronics ambient | -40 to 60 °C; remote mount (4.6 m cable) required above 60 °C process temperature |
| Hazardous area | UL/cUL Class I Div 1 Groups C and D; ATEX Demko II ATEX 1006133X, II 2G Ex d ia IIB T4 Gb; IECEx Ex d ia IIB T4; INMETRO UL-BR 16.0144X |
| Metrology approvals | OIML R117-1 (2007); MID Class 0.3; WELMEC Guide 8.8 under MID (TC 8224) |
| Enclosure | Aluminium NEMA 4 or stainless steel NEMA 4X, IP66 |
Flow ranges by line size
The standard flow ranges in the datasheet are based on Schedule 40 meter bore and a velocity of 0.61 to 12.2 m/s with over-range to 14.6 m/s.
| Meter size (DN) | Meter ID (mm, Sch 40) | Min flow (m3/h at 0.61 m/s) | Max flow (m3/h at 12.2 m/s) | Over-range (m3/h at 14.6 m/s) |
|---|---|---|---|---|
| 100 | 102.26 | 18 | 360 | 433 |
| 150 | 154.05 | 41 | 818 | 982 |
| 200 | 202.72 | 71 | 1,417 | 1,700 |
| 250 | 254.51 | 112 | 2,233 | 2,679 |
| 300 | 303.23 | 158 | 3,170 | 3,803 |
| 400 | 381.00 | 250 | 5,004 | 6,005 |
| 450 | 428.65 | 317 | 6,334 | 7,601 |
| 500 | 477.82 | 394 | 7,871 | 9,445 |
| 600 | 574.65 | 569 | 11,383 | 13,660 |
Conditioning, calibration and selection
For higher viscosity fluids the datasheet gives flow conditioning recommendations by Reynolds number: a low Reynolds solution for 5,000 to 13,000, a Daniel Profiler or CPA 50E flow conditioner for 5,000 to 10,000, and a tube bundle for 10,000 and above. Emerson offers an ISO 17025 certified flow calibration laboratory for all meters. Pressure ratings by body material and flange class, weights and dimensions, and ordering information are in the datasheet. Related metering products are listed under Flowmeters, and flow computers such as the FloBoss S600+ are on the site.
Documents and quotation
The Emerson product data sheet 00813-0100-3814 (Rev AE, March 2025) is attached. For a quotation please give line size, flange class, product and viscosity range, flow range, pressure and temperature, material and NACE or NORSOK needs, hazardous-area and metrology approvals required, and calibration requirements.
See also: Emerson 1410S Wireless Gateway with 781S Smart Antenna.
Datasheets & Documents
- Datasheet Rosemount 3814 Product Data Sheet 00813-0100-3814 Rev AE (March 2025) Download
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About brand
Rosemount is Emerson's brand for pressure, temperature, level and flow measurement, best known for the 3051 pressure transmitter. Frank Werner, Robert Keppel and Vernon Heath founded it in Minnesota in 1956 as Rosemount Engineering Company, first making temperature sensors for aerospace. It moved into the process industries, took the name Rosemount Inc. in 1966, and has been part of Emerson since 1976.
Seven Star LLC is an independent supplier in Muscat. We list Rosemount transmitters, level instruments, flowmeters and analytical sensors, and supply them and their spares to oil and gas, power, water and process plants in Oman and the GCC by model code.
Rosemount company profile
| Established | 1956, Minnesota, USA, as Rosemount Engineering Company |
|---|---|
| Founders | Frank D. Werner, Robert E. Keppel and Vernon H. Heath |
| Ownership | Acquired by Emerson in 1976; now an Emerson brand |
| Product families | Pressure, DP flow and level transmitters, temperature sensors and transmitters, radar and guided wave radar level, vibrating fork switches, tank gauging, magnetic, vortex and ultrasonic flowmeters, liquid analysis sensors and wireless instruments |
Milestones
- 1956: Robert Keppel, Vernon Heath and Frank Werner incorporate Rosemount Engineering Company in Minnesota; early work is aerospace sensors.
- 1969: The Rosemount 1151 analog pressure transmitter is introduced.
- 1976: Emerson acquires Rosemount.
- 1989: The Rosemount 3051 pressure transmitter, built on digital technology, is launched.
- 2001: The 3051S generation follows.
Rosemount products we list
| Family | Models | Typical use |
|---|---|---|
| Pressure transmitters | 3051, 3051C coplanar, 3051T in-line, 3051S, 3051S series, 3051SMV multivariable, 2051, 2088, 1199 diaphragm seals | Pressure, differential pressure and remote seal measurement |
| DP flow and DP level | 3051CF flowmeter, 3051L, 3051SAL | Flow through primary elements, and level in pressurised vessels |
| Temperature | 644, 248, 3144P, 848T, 648 wireless, 214C RTD sensor, 2240S multi-input | Process temperature, high-density multipoint and tank temperature |
| Radar and level | 5408, 5400, 5300 GWR, 3300 GWR, 3308A wireless, 5900S, 5900C tank gauges | Level in tanks, separators and custody transfer tank gauging |
| Level switches | 2120, 2140, 2160 wireless, 702 discrete transmitter | High and low level alarms, overfill protection and pump protection |
| Flowmeters | 8700 magnetic, 8800D vortex, SeniorSonic 3414, 3415/3416, 3417, JuniorSonic 3411/3412, 3814 liquid | Water, steam and gas flow, and fiscal gas and liquid metering |
| Liquid analysis | 396P TUpH, 396PVP, 499ACL chlorine sensor | pH, ORP and free chlorine in water and process streams |
Many Rosemount transmitters share one platform, so the model code tells you what you have. On a 3051, the letter after the number sets the type: C for coplanar (differential or gauge), T for in-line, L for liquid level and CF for a complete flowmeter. The next characters set the measurement type, the range code, the output (4-20 mA HART, FOUNDATION Fieldbus or WirelessHART) and the wetted materials. A transmitter with the wrong range code may work, but with poor accuracy at the point that matters.
Where Rosemount instruments are used
In Oman and the GCC, Rosemount instruments are used across upstream oil and gas, gas plants and LNG, refineries, tank farms and terminals, power and desalination stations, and water networks. Ultrasonic gas meters and tank gauges are used for fiscal and custody transfer measurement.
Ordering Rosemount instruments: what we need
Send the full model code from the nameplate (for example 3051CD2A22A1AM5B4) and the tag if it is a replacement. For a new instrument, send the measuring range, process connection, wetted materials, output protocol and hazardous area approval.
Facts checked against Emerson's Rosemount history and published company histories, October 2026.
Browse Rosemount products by category: Pressure Instrumentation, Temperature Instrumentation, Level Transmitter, Liquid Analysis Sensors, Flowmeters.
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Frequently Asked Questions
What liquids is the 3814 meant for?
Liquid hydrocarbons in custody transfer. The datasheet lists FPSOs, offshore platforms, crude oil and refined product pipelines (ethane, LPG, gasoline, diesel, aviation fuel), loading and off-loading of ships, barges and railcars, and tank farms.
What accuracy and uncertainty does it state?
Linearity is plus or minus 0.15 percent of measured value over 1.2 to 12.2 m/s, or plus or minus 0.20 percent over 0.6 to 12.2 m/s as an option. Uncertainty of meter factor is below plus or minus 0.027 percent per API MPMS Chapter 5 Section 8.
What sizes, pressure and temperature ranges apply?
DN100 to DN600 (4 to 24 in.), 0 to 155 bar, and product temperature of -50 to 100 °C as standard or up to 150 °C as an option. Consult the factory above DN600 or ANSI 900.
Does it need periodic calibration?
The datasheet says no moving parts eliminate periodic calibration unless required by local metrology authorities or company guidelines. An ISO 17025 certified flow calibration laboratory is available for all meters.
Is Seven Star LLC a distributor of Rosemount or Emerson?
No. Seven Star LLC is an independent industrial supplier in Muscat and is not a distributor or agent of Rosemount or Emerson. We work from the manufacturer's ordering information and certified drawings.
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