About Our Companies Products & Services Markets References Sustainability Contact us
Work in progress
Transus Instruments · Flow Meter Group · Flocaltec
Flow meters
Three complementary measurement technologies – ultrasonic, rotary and turbine – engineered for natural gas, biomethane and hydrogen blends, from low-pressure distribution to high-pressure transmission.
NMiMIDOIML R137ATEX / IECExPTB
Overview
Ultrasonic, rotary and turbine technologies for every gas measurement task.
Our flow meter portfolio covers the full operating envelope of the European gas grid. From the patented Transus LPM-zD ultrasonic meter – a true zero-D design that eliminates upstream and downstream straight-pipe requirements – to the FMG rotary range up to G65,000 and turbine meters up to DN400, we offer one of the broadest fiscal-grade meter ranges in Europe.
Every meter can be delivered with full traceable documentation, Euroloop, Force, PIGSAR or others witnessed calibration and is qualified for hydrogen blends in selected ranges. All meters integrate seamlessly with Ex-i flow computers and operator SCADA systems for end-to-end metrological accountability.
Key specificationsHeadline performance data
- Size
- Up to 48″ · 1500#
- Flow range
- G4 → G65,000 / 10–40,000 m³/h
- Pressure
- up to 250 bar
- Accuracy
- ±0.2% (ultrasonic)
- Hydrogen
- Blends up to 40% (selected)
Applications & industries
Where it’s used
Flow meters from the Gas Measurement Group are deployed across the global energy value chain – from transmission networks to industrial end-users.
Gas transmission & TSO
Custody transfer at border and entry stations, fiscal balancing and grid-quality measurement at high pressures.
Distribution (DSO)
Pressure-reduction stations, district metering and zero-D installations where straight pipe is unavailable.
Industrial energy
Delivering reliable, high-accuracy measurement across wide flow ranges for plant sub-metering, energy allocation and internal billing.
Hydrogen & green gas
FMG rotary meters certified for hydrogen blends and Transus Instruments ultrasonic meters up to 40% H₂-ready – future-proofing your infrastructure.
Range
Available products & solutions
Supplied by Transus Instruments · Flow Meter Group · Flocaltec
TransusUIM ultrasonic gas meterMulti-path ultrasonic gas meter for fiscal custody transfer and high-pressure process duty – high accuracy, wide turndown and optionally retractable transducers for in-service maintenance.
SizeDN80 and larger; flange ratings up to 900#
Pressureup to 153 bar (2250psi)
Accuracy±0.2%
CertificationsOIML R137-1&2 (class 0.5) · AGA-9 · MID 2014/32/EU
Natural gasCustody transferOIML R137AGA-9MIDH₂ ready Request quote 
TransusLPM ultrasonic meter (LPM-zD)True zero-D ultrasonic meter for distribution networks using patented Broadband Continuous Wave technology – no upstream/downstream straight pipe required.
InstallationZero-D (no straight pipe)
PressureDistribution
Accuracy±0.5%
CertificationsMID · OIML R137
DistributionZero-DLPM-zDOIML R137MIDH₂ ready Request quote 
Flow Meter GroupRotary gas metersFMR series rotary meters for distribution, industrial measurement and H₂ blends.
SizeDN40 to DN200 mm
Pressureup to 100 bar
AccuracyClass 1.0
CertificationsMID · EN12480 · OIML R137
Natural gasH₂ readyMID Request quote 
Flow Meter GroupGas turbine metersTurbine flow meters for high-flow distribution and industrial gas measurement.
SizeDN80 to DN600 mm
Pressureup to 100 bar
Accuracy±0.5%
CertificationsDutch NMi · MID · EU/OIML directives
Natural gasMID Request quote 
TransusFlare gas metersHighly accurate single or dual path ultrasonic flare gas meter using patented Broadband Continuous Wave technology for flare, vent, fuel, boil-off, process and biogas applications.
Size3–36 in (other on request) · 150–900 lb
Flow range0.1 – 65 m/s
AccuracyUIM-1: 2%/3% · UIM-2: 1.5%/2%
CertificationsATEX Zone 0/2 · IECEx · cQPSus · IP66 · MODBUS
FlareVentEmissionsATEXH₂ ready Request quote
Discuss your flow meters requirement
Our team will scope, quote and (if needed) prototype the right solution for your site.
Request a quote All products
Explore the portfolio
Other product categories
Turnkey pre-fabricated skids – designed, built, tested and certified in-house.
Traceable, NMi-witnessed calibration – in the lab and on your site.
Representative sampling for liquid, gas and LPG – engineered to ISO and API.
Custom-engineered electrical and instrumentation panels for oil & gas.
The complete gas measurement chain – six specialist companies covering precision components, flow meters, metering systems, and calibration.
Our Companies
Products
Group
Onderzeel 6, 2920 Kalmthout, Belgium
info@gmg-group.com
+32(0)3 217 97 70© 2026 Gas Measurement Group · Belgium & Netherlands Privacy policyCookie settings