Gas flow measuring instruments

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.


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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Exact and reliable emission monitoring - compliant with legal regulations

Monitoring gaseous emissions in plants requiring a permit is an important part of environmental protection. Pollutant emissions can be continuously measured and limit values observed through the use of modern and reliable emission measuring technology. The measuring technology used must comply with the minimum requirements of international standards (e.g. EN 15267 and EPA Performance Specification 6) and prove its suitability by means of an EU type examination. FLOWSIC100 gas flow measuring instrument from SICK meet all these requirements: they combine the advantages of modern ultrasonic measurement with outstanding resistance properties and minimum maintenance.

FLOWSIC100 variants


Ideal for large stacks with diameters from 3 to 13 m with high switching capacity

Suitable for applications with high dust levels

FLOWSIC100 M Ideal for small stacks with diameters up to 3.5 m with medium switching capacity
FLOWSIC100 PR Ideal for one-sided installation with stack diameters from 1 m

Exact, reliable, consistent.

Easy installation in measurement channels
SOPAS ET – easy parameterization, configuration and self-diagnosis as well as comprehensive support
Low maintenance costs as there are no moving parts

Easy installation, fully-automated self-monitoring and low maintenance costs - the optimal solution for challenging emission measurements.

Consistent measurement results even under extreme conditions

Fluctuations in the gas composition, pressure, temperature and humidity have no influence on the measurement result. Measurement takes place continuously across the entire duct diameter and supplies representative results. The fully automated gain control function of the FLOWSIC100 guarantees signal transmission. The device periodically validates its functions using the check cycle integrated in the FLOWSIC100, while the integrated self-diagnosis continuously monitors all important function parameters. In the event of impermissible deviations that could affect the measurement result, warning messages are generated.

Powerful and precise.

Measurements without purge air, plug and play from –40°C to 260°C.
Innovative integrating cooling for very high gas temperatures of up to +450°C.



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