Sierra Instruments, Inc.

- Model 240i Inline - iSeries Next Generation Vortex Flow Meters

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Pipe sizes from 1.0 to 8.0 inches (DN25 to DN200). Ideal for saturated or superheated steam, gas, and liquid applications. Mass and/or volumetric flow rate. Multivariable for five (5) measurements in one compact device. Latest iSeries Raptor II OS flow engine. Complete suite of digital communications. Certified for Boiler MACT measurement meeting EPA regulations for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD). Part of Sierra's Big-3 iSeries family of flow meter technologies.

In 1997, Sierra was the first to introduce a combination volumetric vortex and multivariable mass flow meter. Today, Sierra’s completely redesigned InnovaMass iSeries 240i/241i builds on two decades of success measuring five process variables for gas, liquid, and steam with one connection.

With this multivariable capability, it's easier to maximize your steam productivity and reduce overall cost of ownership for more energy savings.


Experience innovative tools driven by our new Raptor II OS that will empower you and save time and money.

  • ValidCal Diagnistics delivers field validation
  • MeterTuning cancels noise, improves accuracy
  • Dial-A-Pipe allows you to quickly change pipe sizes in the field
  • Dial-A-Fluid measures a variety of fluids whenever you choose
  • qMix makes/measures custom mixtures
  • Many more apps to come

An industry first!  With Sierra's field adjustment Apps, we build, calibrate and stock the InnovaMass 241i insertion version so it can be purchased online and shipped next day.

The InnovaMass vortex is also ideal for compliance for Boiler MACT regulations for steam outlet and inlet feed water measurements for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD).

iSeries Introduces Comprehensive Flow Energy Management

Under what is called the iSeries platform, the all new InnovaMass 240i is now a platform for massive innovation. The reinvented InnovaMass 240i delivers a revolution in flow energy management by maximizing measurement precision and realizing this goal with the following new iSeries features:

  • Flow Energy Calculations: AGA8 natural gas, steam enthalpy, thermal energy/BTU
  • Raptor II OS microprocessor is 10x faster to run robust software applications
  • Field diagnostics, validation, and adjustment through onboard Smart Interface Portal
  • Rapid update of latest features with field firmware upgrade capability
  • FloPro™ software application improves point-velocity accuracy for insertion version
  • Complete suite of digital communications for turnkey networking & automation
  • Patented MassBalance™ sensor in tandem with Raptor II for mechanical and digital signal processing breakthroughs

Raptor II OS: The Flow Engine Behind It All

Originally developed as the operating system for our QuadraTherm thermal mass flow meter, Raptor II OS is the “flow-engine” programing inside every InnovaMass iSeries vortex meter. Raptor II uses advanced digital signal processing and proprietary mathematical algorithms to enhance the flow signal, while also calculating the thermodynamic properties of the gas, liquid or steam being measured in real-time. Raptor II OS:

  • Easily manages all five process variables in real time
  • Offers apps like FloPro™ , Dial-A-Pipe™ , Dial-A-Fluid™ ,ValidCal Diagnostics, and Meter Settings.
  • Allows for field firmware upgrades
  • Enables creation of unique fluid mixtures with qMix™
  • Enhances velocity signal for greater sensitivity at low flows
  • Interfaces with the Smart Interface Portal software to read and adjust the meter in the field
  • Includes a fluid database with nearly all liquids, gases, and complete steam tables

World-Class Flow Calibration Facility

Every flow meter is only as good as its calibration. Each InnovaMass is calibrated by Sierra’s new calibration facility in Monterey, California, to assure the highest level of quality. Flow standards with accuracies of 0.2% of reading are used to assure the highest accuracy possible. 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).

Inspired by Formula One Racing

In 2014, Sierra’s Automotive Test Division completed a state-of-the-art F1 engine testing facility for Honda. Sierra’s CADET test automation software was installed to manage all aspects of engine testing. Sierra’s flow division immediately saw the potential to deliver this same level of excellence to InnovaMass calibration. Today, the same CADET software that tunes those F1 engines now runs pumps, reads calibration standards, performs high-speed data acquisition and performance analysis, and even sounds alarms if anything goes wrong. Every unit we calibrate adds data to Sierra’s database for continuous calibration process improvement.

  • Mass or volumetric flow monitoring of gases, liquids and steam
  • Compact, low-cost alternative to Coriolis meters
  • Measures five (5) process variables with one (1) process connection:
    • Mass flow rate
    • Volumetric flow rate
    • Temperature
    • Pressure
    • Fluid density
  • Custom Options Available:
    • Wide range of process connections
    • Wide range of materials
    • High pressure
    • Low/High temperature
  • Rugged, long-lasting design for the toughest applications; no leaks with all welded gasket-free flow body
  • No moving parts; easy to instal
  • Sensors located behind bluff body are well protected from pressure shocks and water hammer
  • External temperature & pressure input capability
  • Datalogging capability
  • Three configurable 4-20 outputs
  • No periodic recalibration required
  • Large LCD display and pushbutton interface; remote enclosure mounting available
  • Optional BTU measurement for steam and water
  • Raptor II™ OS flow engine microprocessor can build and measure complex liquid and gas mixtures
  • Smart Interface Portal software offers easy field validation and meter tuning 
  • Dial-A-Pipe: Change pipe size in the field
  • Dial-A-Fluid: Change fluid in the field
  • FloPro™ optimal flow profile calculation for  241i insertion
  • Firmware is field upgradable
  • AGA-8 algorithms for natural gas
  • Patented MassBalance™ sensor (Pat # 5869772)
  • Advanced signal processing enhances accuracy with:
    • Continuous real-time norms for signal strength/quality
    • Sudden changes to anticipated signal strength/quality rejected as noise
  • Raptor II and MassBalance technology extends range down to Reynold’s numbers well below 5000
  • Vibration effect cancellation:
    • Signal processing cancels out the effect of common mode noise
    • Common mode noise is vibration in piping system
  • Multiple languages
  • An insertion probe version up to 72 inches (2M) in length
  • Online Sizing Program
  • Certified for Boiler MACT measurement meeting EPA regulations for area source boilers (40 CFR 63, subpart JJJJJJ) and for major source boilers (40 CFR 63, subpart DDDDD)

  • Mass or volumetric flow monitoring of gases, liquids and steam
  • Inline 1 to 8 inches (25 to 203 mm)
  • Accuracy:
    • Mass flow: +/- 1.0% of reading over a 30:1 range (liquids); +/- 1.5% of reading over a 30:1 range (gas & steam)
    • Volumetric: +/- 0.7% of reading over a 30:1 range (liquids); +/- 1.0% of reading  over a 30:1 range (gas & steam)
  • Flow range (30:1 Turndown):
    • Liquids:
      • 1 ft/s (0.3 m/s) Velocity Minimum
      • 30 ft/s (9.1 m/s) Velocity Maximum
    • Gas & Steam:
      • 10 ft/s (3.05 m/s) Velocity Minimum
      • 300 ft/s (91.5 m/s) Velocity Maximum
  • Repeatability
    • Mass Flow Rate: +/- 0.2% of reading Volumetric Flow Rate: +/- 0.1 % of reading Temperature: +/- 0.2°F (+/- 0.1 °C)
    • Pressure: +/- 0.05% of full scale
    • Density: +/- 0.1 % of reading
  • Process fluid temperature:
    • Standard: -40°F to 392 °F (-40°C to 200 °C)
    • Ambient temperature:
      • Operating: -5°F to 140°F (-20° to 60°C)
      • Storage: -40°F to 150°F (-40° to 65°C) 0 to 98% relative humidity, noncondensing conditions
    • High temperature up to 750°F (400°C). See 240S.
  • Process pressure:
    • Pressure to 1500 psig (103 barg)
    • Optional High pressure to 5000 psig (345 barg); See 240S
  • Power supply options:
    • 24 VDC +/-10%, 0.4 amp maximum
    • 100 to 240 VAC, 50/60 Hz, 0.2 amps RMS at 12 W maximum
  • Output signals:
    • Three programmable 4 to 20 mA   
    • User definable pulse output for totalized flow
  • 316 stainless steel constructionHazardous-Area Location Enclosure NEMA 4X (IP65)
  • Digital Communications:
    • HART
    • Modbus
    • Profibus DP
    • Foundation Fieldbus
    • USB, RS-232
  • Approvals:
    • cFMus
    • ATEX
    • IECEx
    • CE

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