The FMT-Lx turbine gas meter is an extremely accurate flow meter (MID approved for fiscal use by the NMi) suitable for various types of gas at operating pressures up to 100 bar (1440 psi). The integrated flow conditioner minimized the need for straight upstream piping to just 0 x D.


The FMT-Lx series turbine meter is a robust meter, designed to perform on the highest level of accuracy. The meters comply with all international standards and are approved for custody transfer. The actual flow sensor, an exchangeable cartridge, has a build-in multi stage flow conditioner enabling the meter to be installed without any straight in- and outlet sections. All tested and proved according perturbation test as per international standards.

The cartridge can be pre-calibrated, under both low and high pressure conditions, then exchanged on-site. The cartridge is supported in O-rings and isolated from the body, hence unaffected by any influences of the housing. The short length cartridge enables the use of larger sized cartridges than the size of the meter body. The approved maximum capacities of these kind of meters are extremely high and similar to the capacities of ultrasonic meters.

To reduce transportation cost, optimize the corrosion protection and improve safety in handling, the FMT-Lx series of turbine meters up to 6’’ (DN150) are also available with low weight aluminum meter bodies.

FMT-Lx Principle

The operation of the FMT series of turbine meter is based on the measurement of the velocity of gas. The flowing gas is accelerated and conditioned by the integrated multi stage flow conditioner. The multi stage flow conditioner prepares the gas flow profile by removing undesirable swirl and asymmetry before the gas flows over the freely rotating turbine wheel.

The dynamic forces of the flowing gas cause the rotor to rotate. The turbine wheel is mounted on the main shaft, with high-precision, low-friction ball bearings.

The turbine wheel has helical blades that have a known angle relative to the gas flow. The gas flow drives the turbine wheel at an angular velocity, which is proportional with the gas velocity. Using a gearing mechanism, the rotating turbine wheel drives the mechanical counter.


The standard FMT-Lx turbine meter is suitable for custody transfer gas measurement of all non-corrosive gases such as natural gas, propane, butane, air, nitrogen, hydrogen, etc. for low and high operating pressures. Special constructions can be supplied for use under extreme condition like high temperatures or corrosive gases. The FMT-Lx can be modified to perform as a master meter or transfer master meter.

  • Consultancy Service & Maintenance
  • Product & System Trainin
  • Approvals (Safety, Electrical & Metrological)
  • Gas Metering
  • EVCD system design

Additional information

Flow rates:

5 m3/h up to 25.000

Nominal diameters:

from DN50 to DN600 mm (2” to 24”)

Max. working pressure:

up to 100 bar depending on the body material and flanging

Mounting position:

horizontally or vertically