Gas flow measuring instruments

Volume flow measuring devices for continuous emission monitoring

Your Benefits

  • Reliable flow measurement for ducts with small up to very large diameters
  • High durability of the device
  • No purge air required for applications with gas temperatures up to 260 °C
  • Minimum operating and maintenance costs
  • Accurate measuring results under difficult measuring conditions
  • Measurement without pressure loss, therefore no influences on the process
  • User-friendly operation via SOPAS ET software
  • Reliable function monitoring due to enhanced diagnosis

The exact device specifications and performance data of the product may deviate from the information provided here, and depend on the application in which the product is being used and the relevant customer specifications.
In accordance with Article 2 (4), this product does not fall within the scope of RoHS directive 2011/65/EU and is also not designed for use in products which fall within the scope of this directive. You can find additional information in the product information.


Volume flow measuring devices for continuous emission monitoring

The product family FLOWSIC100 was designed for emission monitoring tasks. The "H" versions are suitable for stacks with large diameters and applications with high dust content. The "M" versions are especially suited for stacks with medium diameter. The ultrasonic transducers of the "PR" probe type are mounted with fixed path length on one sender/receiver unit (measuring probe). The "AC" versions have an innovative internal cooling and are suitable for gas temperatures up to 450 °C. The purged "Px" versions are used for gases with high concentrations of sticky or wet dust.

Rugged titanium transducers are standard and suitable under difficult conditions. The measuring system consists of 2 sender/receiver units or a measuring probe and a MCU control unit. The MCU is used for input and output of signals, for calculation of volume flow to reference conditions (standardization) as well as user-friendly LCD interface.

At a glance
  • Rugged titanium converters for long service life
  • Corrosion-resistant material for use with aggressive gases (option)
  • Integrated measurement via duct diameter for types H, M, and S
  • Probe version PR for cost-saving, single-sided installation in duct
  • Automated operational check with zero and reference point test


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Technical overview

  • Technical data overview

    Technical data overview

    Measured valuesVolumetric flow a. c., volumetric flow s. c., gas velocity, sound velocity, gas temperature
    Measurement principleUltrasonic transit time difference measurement
    Gas temperature–40 °C ... +450 °C
    Depending on device version
    Operating pressure–100 hPa ... 100 hPa
    Nominal pipe size0.15 m ... 13 m
    Depending on device version

    2001/80/EC (13. BImSchV)

    2000/76/EC (17. BImSchV)

    27. BImSchV

    30. BImSchV

    TA-Luft (Prevention of Air Pollution)

    EN 15267

    EN 14181

    EN 16911-2



    FunctionConnection to SOPAS ET software
    Serial✔ , ✔
    Type of fieldbus integrationRS-232
    FunctionConnection to SOPAS ET software
    Internal system bus
    Type of fieldbus integrationVia optional interface module
    Modbus✔ , ✔ , ✔
    Type of fieldbus integrationASCII RS-485 (via optional interface module)
    RTU RS-485 (via optional interface module)
    TCP (via optional interface module)
    Type of fieldbus integrationVia optional interface module
    Diagnostics functions

    Automatic check cycle for zero and span point

    Extended device diagnosis via SOPAS ET software

All technical data can be found accompanying the individual product