Sierra 203 Economical Ultrasonic Flow Meter

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Sierra 203 Economical Ultrasonic Flow Meter

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The InnovaSonic 203 liquid flow meter is optimized for customers still looking for high performance, but needing a lower-cost, less feature-rich option for dedicated clamp-on ultrasonic metering. The 203 digital liquid flow meter optimizes the measurement of water as it flows in HVAC, irrigation and other liquid applications.



  • One meter for a wide range of pipe sizes from 2 inch to 48 inches (50.8 mm to 1200 mm)
  • Clamp-on encapsulated IP 68 sensors require no pipe cutting, no plant shut-down, and are hygienic measurement leading to lower installation and labour costs
  • Measurement is independent of fluid conductivity for a wider applicability compared to magnetic meters
  • Programmable frequency output and VAC power emulates turbine/propeller meters
  • Accuracy +/- 1.0% of reading from 1.6 to 40 ft/s (0.49 to 12 m/s)
  • Repeatability +/- 0.3% of reading
  • Wide operating temperature range 32°F to 140°F(0°C to 60°C)
  • 16 tactile keys with 12 dual-function keys for easy setup
  • Configurable pulse and relay output
  • 10 to 36VDC at 1A power supply
  • Daily, Monthly, and Yearly totalized flow
  • Lightweight (0.7 kg; 1.5 lb) PC/ABS IP 65 transmitter
  • Digital Output: Modbus RTU, RS-485
  • Daily, monthly and yearly totalized flow
  • Display: 40 character, 2 line (20 x 2) lattice alphanumeric, backlift LCD
  • Up to 99% RH (non-condensing)

Common Applications: 

  • Cooling and heating fluid measurements
  • Water and wastewater measurements
  • Leak detection in piping systems
  • Monitoring and controlling of HVAC systems
  • Contactless product recognition
  • Interface detection
  • Automated process control

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