The Rosemount™ 3418 Eight‑Path Gas Ultrasonic Flow Meter delivers high‑accuracy custody transfer measurement with advanced swirl immunity for challenging installations.
Its eight‑path design compensates for flow disturbances, enabling OIML R137 Class 0.5 performance with as little as 5D upstream piping and no flow conditioner—helping reduce installation cost, simplify design, and ensure reliable, audit‑ready measurement in natural gas applications.​
Rosemount 3418 Gas Ultrasonic Flow Meter
Rosemount™ 3418 Eight-Path Gas Ultrasonic Flow Meter

Specs

Line Size
DN250 to DN1050 (10-in to 42-in) with British Gas (BG) orientation
Fluid Type
Gas
Accuracy
±0.1% of reading relative over entire flow calibration range
Repeatability
±0.05% of reading for 5 to 100 ft/s (1.5 to 30.5 m/s)
Velocity
Rated up to 100 ft/s (30 m/s) with over-range performance exceeding 125 ft/s (38 m/s) on some sizes
Operating Temperature Range
–58°F to +212°F (–50°C to +125°C)
Operating Pressure Range
0 to 4,000 psig (276 barg)
Materials
Carbon steel and stainless steel
Safety and Environmental Compliance
UL / cUL
Custody Transfer Compliance
AGA 9​

Features

  • Maintain custody transfer accuracy with minimal upstream piping and no flow conditioner using an eight-path design that compensates for swirl, asymmetry, and crossflow, reducing pressure loss, blockage risk, and maintenance requirements.​
  • Enable compact installations with as little as 5D upstream piping while maintaining OIML R137 Class 0.5 performance.​
  • Increase operational flexibility with >100:1 rangeability to support wide flow conditions with fewer meter runs. ​
  • Simplify troubleshooting with Smart Meter Verification that converts diagnostic data into clear, actionable insights.​
  • Improve measurement confidence using multi-path diagnostics that detect changing flow profiles and process disturbances early.​
  • Minimize downtime with non-wetted transducers that can be serviced or replaced under pressure without special tools.​
  • Support advanced calculations with electronics that compute corrected volume, mass, and energy flow rates in real time.​
  • Automate compliance with integrated AGA 8 and AGA 10/GERG- 2008 calculations for consistent, audit-ready gas measurement.​
  • Enable flexible integration with high-speed electronics offering Ethernet connectivity and multiple I/O options.

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