Flow Meter Home > Product > Ultrasonic Flow Meters > InnovaSonic®207i

Ultrasonic Liquid Flow Meter With Thermal Energy/BTU Capability


  • High accuracy transit-time ultrasonic technology
  • Software apps for ease of installation & diagnostics
  • Optimized for thermal energy/BTU measurement
  • Clamp-on sensors, no pipe cutting, no shutdown
  • Real-time liquid density compensation
  • Upgrade meter firmware and software in the field
  • Part of Sierra's Big-3 iSeries family of flow meter technologies, Learn more >

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  • Product Benefits
  • Specifications
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Higher Accuracy With Liquid Density Compensation

The 207i firmware enables vast improvements in liquid flow metering accuracy. Since an ultrasonic flow meter detects the speed of sound in the liquid being measured, a small change in liquid density can have a big impact on accuracy and repeatability.  By adding a temperature input from a transmitter provided by Sierra or by using an external input from an existing transmitter, the 207i can calculate real-time liquid density, assuring the highest accuracy possible.

Thermal Energy / BTU Metering

The 207i calculates thermal energy / BTU flow energy and provides you with the highest accuracy measurements possible to manage energy costs.

A critical element of any thermal energy / BTU flow energy measurement is determining the amount of heat transferred between the cold and hot flow legs of an HVAC process.Often with only a small difference in temperature between the two flow legs, a precise measurement makes a huge difference. Sierra calibrates the entire flow energy package— flow meter and temperature transmitters—as a system to improve quality.

The 207i takes into account this temperature difference as well as all fluid properties required to accurately measure flow, and makes ultra-precise temperature measurements between the cold and hot flow legs.

The Flow Engine Behind it all

Sierra’s Raptor 2 OS is the true “Brain” of the 207i.  Every 207i has advanced digital signal processing to enhance ultrasonic transit-time flow metering technology and fluid dynamic measurements. The result is a proprietary, fundamentally different liquid flow rate calculation using all pertinent variables for the most precise, stable and accurate flow measurement possible.

The OS interfaces with Sierra’s software apps to read, adjust and upgrade the meter firmware in the field.

Making Installation Easier

With the InnovaSonic 207i’s clamp-on sensors, there’s no pipe cutting or expensive plumbing.

The 207i features a large backlit display and dual-function keypad with audible feedback. With its visual sensor spacing tool on the local display or using the software app, slightly move the sensors together or apart to position the indicator line between the “goal posts” and assure optimal signal strength.

World Class Calibration

Every flow meter is only as good as its calibration. To assure the highest accuracy possible, each InnovaSonic is calibrated at Sierra’s flow calibration facility in Monterey, California which consistently delivers calibration accura-cies of +/- 0.2% of reading.

All calibrations follow the guidelines of ISO 17025 and are directly traceable to national standards such as NIST (United States National Institute of Standards and Technology).

Fully automated, once flow application data is programmed, calibration automation software manages all aspects of flow calibration testing. High-speed time-aligned data acquisition and performance analysis over the entire flow measurement range occurs. A calibration certificate documenting instrument per-formance is then generated.

Service, Commissioning & Training

The need to deliver fast, localized support to global customers has resulted in the establishment of dedicated Sierra Flow Centers on almost every continent. And they are backed up by technical experts in over 150 locations in more than 50 countries.

Sierra’s team of engineers can commission your flow meter to assure optimal performance and train you to get the most out of your instrument.

We provide lifetime support for all Sierra products and will even get on a plane to provide support when needed.

Sierra’s Big-3 Technologies

The InnovaSonic 207i is one of three advanced flow meter technologies Sierra has developed to help facility managers tackle tough energy management challenges.

For what we call our Big-3, Sierra has become a recognized expert in thermal mass (QuadraTherm®), vortex shedding (InnovaMass®), and transit-time ultrasonic (InnovaSonic®). Sierra is the only company in the USA to manufacture all three flow technologies.

The Big-3 are optimized to be a complete solution for flow energy measurement—facility flows that impact costs like compressed air, natural gas, steam, and hot or chilled water. As new apps and improvements become available, all Big-3 technologies benefit and are field firmware upgradable.

Common applications include: 

  • Thermal energy/BTU measurement
  • Cooling and heating fluid measurements
  • Water and wastewater measurements
  • Leak detection in piping systems
  • Monitoring and controlling of HVAC systems
  • Fuel and oil consumption measurements
  • Contactless product recognition
  • Interface detection
  • Offshore applications
  • Automated process control

Rental Program For Clamp-On Ultrasonic Flow Meters

With our new InnovaSonic rental program, we can deliver any InnovaSonic ultrasonic product to your job site quickly and offer you a flexible rental plan to meet your needs. And if you love the product, you can own it. Learn more about our rental program or get started now.