3814 Flowmeter Ultrasonic Innovation for Reliable Liquid Flow Measurement
The Rosemount™ 3814 Ultrasonic Flowmeter is a high-accuracy liquid measurement solution designed for custody transfer and critical process applications. With its four-path ultrasonic design, it ensures exceptional precision, repeatability, and long-term stability while maintaining a full-bore, no-pressure-loss construction. Built to comply with API Chapter 5.8 and OIML R117 standards, the 3814 is trusted across industries such as oil & gas, petrochemicals, and refined products. Its maintenance-free operation is supported by advanced diagnostics that provide real-time insight into flow profiles, turbulence, and process conditions, enabling predictive maintenance and operational efficiency. When paired with the 3810 electronics platform, it delivers powerful data handling, intuitive configuration, and seamless automation integration. Engineered for precision, reliability, and compliance, the Rosemount 3814 sets a new benchmark in ultrasonic liquid flow measurement.
Feature / Parameter
Rosemount 3814 Ultrasonic
Electromagnetic Flowmeter
Turbine Flowmeter
Coriolis Mass Flowmeter
Vortex Flowmeter
Measurement Principle
Transit-time ultrasonic, 4-path
Voltage induced in conductive liquid
Rotor speed proportional to velocity
Direct mass flow via Coriolis effect
Vortex shedding frequency
Accuracy
±0.15% of measured value (liquids, custody transfer grade)
No Pressure Loss – full-bore construction with no obstructions or moving parts.
Advanced Diagnostics – real-time monitoring of flow profile, turbulence, and process conditions.
Compliance Ready – meets API Chapter 5.8 and OIML R117 international standards.
Low Maintenance – non-intrusive measurement with minimal wear and long service life.
Wide Rangeability – turndown ratio up to 400:1 for flexible operation.
Seamless Integration – pairs with the Rosemount 3810 electronics platform for powerful data handling and automation connectivity.
Industry Proven – trusted in oil & gas, petrochemicals, and refined product applications.
Main Applications
Custody Transfer of Liquid Hydrocarbons
Trade measurement of crude oil, refined products, and liquid fuels
Complies with API Chapter 5.8 and OIML R117 standards for fiscal metering
Allocation Measurement
Used in pipeline networks and terminals to allocate product volumes between different operators or stakeholders
Pipeline Operations
Monitoring flow in long-distance pipelines for crude oil and refined products
Bi-directional measurement simplifies installation and reduces startup time
High-Viscosity Liquids
Reliable even with heavy crude and viscous products, thanks to its four-path ultrasonic design
Process Optimization & Diagnostics
Advanced diagnostics detect turbulence, asymmetrical flow profiles, or upstream blockages
Supports predictive maintenance and operational efficiency
Energy & Petrochemical Industries
Widely applied in oil & gas, petrochemicals, and refined product distribution, where accuracy and compliance are critical
Rosemount 3814 Ultrasonic Flowmeter – FAQ
Q1. What type of flowmeter is the Rosemount 3814?
A: It is a four-path, in-line ultrasonic flowmeter designed for liquid custody transfer and critical process applications.
Q2. What is the typical accuracy of the 3814?
A: The meter achieves ±0.15% of the measured value, making it suitable for fiscal metering and compliance with API Chapter 5.8 and OIML R117 standards.
Q3. What are the main applications?
A: The 3814 is widely used in custody transfer of crude oil and refined products, pipeline operations, allocation measurement, and high-viscosity liquid measurement.
Q4. Does the 3814 cause pressure loss?
A: No. Its full-bore design ensures no pressure drop and eliminates obstructions in the flow path.
Q5. What diagnostics are available?
A: The meter provides real-time flow profile monitoring, turbulence detection, and process condition diagnostics, enabling predictive maintenance.
Q6. What electronics are used with the 3814?
A: It pairs with the Rosemount 3810 electronics platform, which offers data handling, configuration, and automation system integration.
Q7. What is the turndown ratio?
A: The 3814 supports a turndown ratio up to 400:1, allowing accurate measurement across a wide flow range.
Q8. What industries typically use this meter?
A: It is trusted in oil & gas, petrochemicals, refined products, and energy sectors, especially where accuracy and compliance are critical.
Q9. What maintenance is required?
A: With no moving parts, the 3814 requires minimal maintenance compared to mechanical meters.
Q10. Is the 3814 suitable for bi-directional flow?
A: Yes. The ultrasonic design allows bi-directional measurement, making it ideal for pipeline operations.
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