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Rosemount™ JuniorSonic 3412 Two-Path Gas Ultrasonic Flow Meter
Rosemount 3412 Gas Ultrasonic Flow Meter
Ideal for allocation and check metering, the fully-redundant Rosemount JuniorSonic™ 3412 Two-Path Gas Ultrasonic Flow Meter combines a dual-bounce path design with powerful 3410 Series Electronics to ensure a superior non-fiscal measurement solution.
This cost-effective meter is wet gas tolerant and features rugged Rosemount T-21 Transducers that are engineered for wet, rich and/or dirty gas applications for reliable, long-term performance. Innovative MeterLink™ Software ensures operators have easy access to the diagnostics generated by the meter for real-time detection of flow disturbances.
Rosemount™ JuniorSonic 3412 Two-Path Gas Ultrasonic Flow Meter


Line Sizes
DN100 to DN900 (4-in to 36-in)
Fluid Type
±0.2% of reading with calibration (±1.5% of actual flow volume without calibration)
±0.1% of reading for 5 to 100 ft/s (1.5 to 30.5 m/s)
Rated up to 100 ft/s (30 m/s) with over-range performance exceeding 125 fps (38 m/s) on some sizes
Operating Temperature Range
T-21 Transducers: -20°C to +100°C (-4°F to +212°F)
T-41 Transducers: -50°C to +100°C (-58°F to +212°F)
Electronics: -40°C to +60°C (-40°F to +140°F
Operating Pressure Range
T-21 Tranducers: 1034 to 27,579 kPa (150 to 4000 psig)
T-41 Transducers: 1034 to 27,579 kPa (150 to 4000 psig)
Carbon steel and stainless steel


  • Virtually eliminate incremental pressure drop and reduce energy costs with the meter’s full-bore design
  • Improve maintenance practices and lower costs with no internal moving parts
  • Detect flow disturbances in real time with ultra-fast Rosemount 3410 Series Electronics to minimize uncertainty
  • Monitor flow analysis and receive an intuitive view of meter health with integrated MeterLink Software
  • Enhance performance in harsh conditions long term with rugged Rosemount T-21 Transducers
    Field-replaceable transformer module simplifies maintenance and maximizes uptime
  • Reduce manual errors with automatic calculations of AGA 8 Compressibility and AGA 10 Speed of Sound
  • Increase I/O with new Type 4 CPU Module with up to six frequency or digital outputs