One partner for complete gas measurement

    With decades of experience and a worldwide presence, GMG integrates specialized companies to deliver complete gas measurement solutions – reducing vendor complexity for the energy industry.
    6
    Specialist companies
    150+
    Years combined experience
    40+
    Countries served
    H₂
    Hydrogen-certified products
    The value chain

    From component to certified system.

    Every link in the gas measurement chain sits inside our group, from micron-tolerance precision components, through ultrasonic, rotary and turbine meters, to fully assembled custody transfer skids and ISO 17025 calibration.

    Click any stage to meet the specialist company behind it.

    Our companies

    Six specialists. One group.

    Each company brings deep domain expertise. Together they cover the full gas measurement chain.

    GTA

    Gears & precision components

    Someren, Netherlands

    Transus Instruments

    Ultrasonic flow meters
    Kalmthout, Belgium & Zeewolde, Netherlands

    Flow Meter Group

    Rotary & turbine meters

    Doetinchem, Netherlands

    GGS Oil & Gas Systems

    Custody transfer & metering systems
    Kalmthout, Belgium

    Flocaltec

    Flow calibration, provers & testbenches
    Gendringen, The Netherlands

    Mechatest

    Sampling systems & solutions
    Kalmthout, Belgium & Zoetermeer, Netherlands
    Participations

    Strategic participations

    Learn more
    Flow computers
    Ex-i Flow Measurement
    Independent calibration centre
    Euroloop
    Our clients

    We work for the most impactful businesses in the industry

    Luminus Siemens Esso ExxonMobil Fluvius TotalEnergies Fluxys Cobra Wison PetroVietnam Maran Gas Maritime Petronas ADNOC Petrofac Delamine BASF BW Maritime CB&I Dynagas Excelerate Energy Golar LNG Hanwha Hoegh LNG Vietsovpetro GasLog Sembcorp Worley Shell Luminus Siemens Esso ExxonMobil Fluvius TotalEnergies Fluxys Cobra Wison PetroVietnam Maran Gas Maritime Petronas ADNOC Petrofac Delamine BASF BW Maritime CB&I Dynagas Excelerate Energy Golar LNG Hanwha Hoegh LNG Vietsovpetro GasLog Sembcorp Worley Shell
    Sales network

    Our dealers & partners worldwide

    From our headquarters in Belgium and the Netherlands, GMG operates through a global network of dealers and sales partners.

    Worldwide dealer & sales network
    28 locations
    GMG HQ - Kalmthout
    Transus Instruments - Zeewolde
    Teesing BV - Rijswijk
    Enermeter - Braga
    Agner Service - Albergaria-a-Velha
    Ital Control Meters - Carate Brianza
    GGS Oil & Gas Systems - Kalmthout
    Mechatest Sampling Systems - Zoetermeer
    Flow Meter Group - Doetinchem
    GTA - Someren
    Flocaltec - Gendringen
    TMCo - The Measurement Company - Houston
    Procon Systems Inc. - Calgary
    Inova - Santa Catarina
    Secsas - Madrid, Cundinamarca
    USE - Ultraflux - Rio de Janeiro
    Gozal Lojistik - Istanbul
    Kuwait Maritime & Mercantile - Kuwait City
    BDM / SBT Automation - Abu Dhabi
    Power Gas Company - Cairo
    Potent World Global Ltd - Port Harcourt
    Olio Instruments - Godhra
    RSA Turbotech - Bangalore
    Flosym Sdn Bhd - Kuala Lumpur
    GMG Southeast Asia - Jakarta
    TB Innovation - Busan
    Tianjin Xinke Instrument & Meter - Tianjin
    Transus Instruments Pty Ltd - Hobart
    Why GMG

    Why work with the group?

    End-to-end accountability

    One group owns the full chain, no finger-pointing between suppliers on complex projects.

    Certified measurement accuracy

    Certified accuracy where it matters, NMi-approved products meeting OIML R137, EN 12480, EN 12261 and ISO 17089 standards.

    In-house manufacturing

    Every component manufactured, assembled and validated within the group, in Belgium and the Netherlands.

    Future-proof for energy transition

    Hydrogen-certified products, LNG metering capability and CO₂ custody transfer measurement for carbon capture, ready for the evolving energy grid.

    Carbon capture & energy transition

    Precision measurement for CO₂, hydrogen and the low-carbon gas grid.

    GMG delivers fiscal-grade measurement for the full carbon capture, transport and storage (CCS) chain, alongside hydrogen-certified meters and biogas solutions. We help operators measure, account for and optimise the gases that power the energy transition.

    CCSCO₂ CUSTODY TRANSFERHYDROGENH₂ BLENDINGBIOGASNET ZERO
    CO₂ custody transfer
    Accurate fiscal metering for CO₂ transport and injection.
    H₂-ready meters
    Certified for hydrogen and natural-gas/H₂ blends.
    Gas quality analysis
    Composition monitoring to protect pipeline integrity.
    Featured

    Selected from our portfolio

    View all products
    Transus Instruments
    LPM-zD ultrasonic gas meter

    New true zero-D ultrasonic meter for gas distribution networks, no straight pipe required, patented Broadband CW technology.

    View product
    GGS Oil & Gas Systems
    CO₂ custody transfer measurement

    Fiscal-grade metering systems for CO₂ transport, injection and storage, supporting carbon capture (CCS) projects across Europe.

    View product
    Flow Meter Group
    FMR rotary gas meter

    Rotary meter for distribution & industrial measurement, H₂-certified variants available.

    View product

    Working on a gas metering project?


    Our engineers can help you select the right measurement solution, from a single meter to a complete turnkey system.

    The complete gas measurement chain - six specialist companies covering precision components, flow meters, metering systems, and calibration.

    Group

    Onderzeel 6, 2920 Kalmthout, Belgium
    +32(0)3 217 97 70

    © 2026 Gas Measurement Group · Belgium & Netherlands
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