Sierra Instruments, Inc.

- Model 207i - Ultrasonic Liquid Flow Meter with Thermal Energy/BTU Capability

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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.

What does it mean to challenge the status quo?

Designed, built and calibrated by Sierra for non-intrusive liquid flow metering, and optimized for thermal energy / BTU measurement, the InnovaSonic 207i transit-time ultrasonic flow meter is the ideal turnkey solution for building and district metering, and submetering.

It Has Apps

The 207i is the first transit-time ultrasonic flow meter to come with a comprehensive software package of apps for ease of use, field upgrades, and calibration validation.  Apps like MeterFit help you optimize signal strength to assure best performance.  Apps like EnergyPro allow you to fully configure your thermal energy / BTU flow energy measurement system, including datalog-ging and totalization of all energy functions.  Apps like ValidCal Diagnos-tics make field calibration validation easy.

Sierra has many more apps under development to enhance your product experience.

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.

  • Designed for liquid flow metering applications
  • Thermal Energy/BTU capability
  • Tolerant of liquids with small amounts of air bubbles or suspended solids
  • Ideal for large line sizes or exotic materialsClamp-on standard, insertion transducers available
  • Transducers clamped to outside of pipe
  • Install meter during plant operations-no process shut downs, no leakage risks
  • No moving parts to clog or fatigue like turbine meters
  • Permanent or temporary installations
  • Immune to the process compatibility concerns
  • Operational safety and robustness
  • High zero stability, nearly drift free
  • Optional clamp on or insertion PT 100 RTDs transducers-
    matched pair and temperature compensated
  • Mounting kit included to lock transducer into place
  • Modular electronics enabling field upgrades
  • Large display with push buttons, user-friendly menu
  • Keypad with 16 tactile keys with 14 dual-function keys with audible feedback
  • Internally configured batch controller makes batch control convenient
  • Daily, monthly and yearly totalized flow rate
  • Positive, negative and net flow totalizers (with user selectable scale factors)
  • 16 MB SD card high-memory data logger
  • Easy Installation with Smart Interface Portal Software (SIP)
  • Field validation/configuration to assure operating performance with SIP
  • Local display with Quick key buttons for:
    • Flow, totalized flow
    • Velocity
    • Fluid
    • Signal and diagnostics
  • Configurable pulse, analog and frequency outputs
  • Fully field configurable
  • Compact, low-cost alternative to Coriolis meters

  • Accuracy: +/- 0.5% of reading from 0.16 to 40 ft/s (0.05 to 12 m/s)
  • Repeatability: +/- 0.15% of reading >0.16 ft/s (0.05 m/s)
  • Flow Velocity Range: Bi-directional flows: 0.16 to 40 ft/s (0.05 to 12 m/s) Note: 0.08 ft/s (0.025 m/s) is the default low flow cut-off
  • Pipe Size: 2 to 236  inches (50 to 6000 mm)
  • Pending: small pipes to 0.24 inches (6.1 mm)
  • Resolution: 0.01 ft/s (0.00025 m/s)
  • Response time: 150 ms measuring cycle
  • Temperature: ambient electronics: -4°F to 140°F (-20°C to 60°C)
  • Clamp-on transducers operating temperature range: 14°F to 176°F (-10°C to 80°C) 
  • Clamp-on high temperature transducers operating temperature range: 14°F to 302°F (-10°C to 150°C) 
  • 1.5 in (38.1 mm) insertion DIA transducers; operating temperatuer range: -40°F to 176°F (-40°C to 80°C)
  • Insertion pressure limited to 300 psig (20 barg)
  • Relative Humidity: Up to 99% RH, (non-condensing)
  • Power Supply
    • 90 to 250 VAC, 48 to 63 Hz and
    • 10 to 36 VDC (both are available on each unit)
    • Power consumption
  • Analog Output: Active or passive 4-20 mA current loop; accuracy 0.1% of reading
  • Pulse Output: 0 to 9999 Hz, OCT, (min. and max. frequency is adjustable)
  • Solid state relay, 250 VDC/VAC max, 100 mA max, 40 Ohm max on-state resistance no/nc (SPDT)
  • Digital Output: RS-485, RS-232, optional Modbus RTU, optional BACnet (pending)
  • Display: 160 x 240 LCD backlit display
  • Boiler MACT certified
  • Complete Smart Interface Portal (SIP) for meter set up:
    • User-centered software allows for easy installation and field validation via USB or RS-232.
    • Includes Apps like:
    • Quick Install: Step-by-step meter commissioning and setup
    • MeterFit™: Makes transducer set up easy for a strong signal
    • EnergyPro™: Step-by-step thermal energy/BTU setup
    • ValidCal Diagonstics™: Validate firmware hardware health

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