The CALDON LEFM 340Ci Ultrasonic Flow Meter combines exceptional signal processing technology with advanced transducer design, resulting in a measurement solution that delivers excellent performance, reliability, and safety.

Engineered for natural gas measurement in the most critical applications, the four-path CALDON LEFM 340Ci Flow Meter isolates its transducers behind a pressure boundary so that they are isolated from the process. This feature, which is exclusive to CALDON Ultrasonic Flow Meter products, offers multiple benefits:

Transducer failure caused by erosions, chemicals, sudden pressures, or temperature changes is eliminated.

Transducer elements to be safely removed from behind the pressure boundary without requiring special tools, making the ultrasonic easy to operate.

Additionally, the CALDON LEFM 340Ci Flow Meter comes equipped with the CALDON USM Measurement Advisor condition-based monitoring and configuration software, which provides continuous and remote access to real-time diagnostic data, historical data, and event logs. Data is stored within the flowmeter transmitter but also in a local database structure , giving operators the ability to monitor and analyze critical diagnostics and helping prevent unplanned downtime.

The flowmeter body is designed and manufactured in accordance with national and international codes, regulations, and standards suitable for the global natural gas market.


Standard Features

  • Four-path configuration
  • Fully isolated transducer design
  • Proprietary coating
  • CALDON USM Measurement Advisor

Product resources

Manuals & Support

CALDON LEFM 200 Modbus Manual


CALDON LEFM 3xxCi ultrasonic flowmeters with G3 transmitters Manual


CALDON LEFM G3 Transmitter Modbus Manual


Marketing collateral

CALDON LEFM ultrasonic flowmeters for gas applications Brochure



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