FMG - FMT-S - Turbine Meters

FMT-S Series - Turbine Gas MetersThe FMT-S turbine meters are robust and designed to perform on the highest level of accuracy. Unique for these meters is the fact they comply with all international standards and are approved for custody transfer even with smallest possible installation length. The actual flow sensor, an exchangeable cartridge, has a build-in multi stage flow conditioner enabling the meter to be installed with limited (1 x DN) 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.

To reduce transportation cost, optimize the corrosion protection and improve safety in handling, the FMT-S series of turbine meters are also available with low weight aluminium meter bodies. As an example, the weight of a 12” (DN300) ANSI300 FMT-S is less than 45 kg.

Product DATASHEET - FMT-S Series Turbine Gas Meters


The operation of the FMT-S 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 unique FMT-S 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 conditions like high temperatures or corrosive gases.  Standard FMT-S bodies up to 8” (DN 200 mm.) ANSI150 or PN10/PN16 come with threaded flanges. Larger Sizes or higher pressure ratings up to 24” ANSI600 are available in steel.

The FMT-S has a length of just 1 x DN. For flange ratings up to ANSI300 and PN40, the body is available in aluminium (steel on request). Due to the extremely low weight of these aluminium bodies, the meter can be transported easily and exchanged without special equipment.

Main Features

- Flow range 3- 25.000 m3/h
- Diameters DN50 - DN600 (2” - 24”)
- Pressure rates PN 10 - 100, ANSI 150 - 600
- Pressure rates PN 10 - 100, ANSI 150 - 600

- Compliant with EN12261:2002
- Compliant with EN12261:A1-2006
- Compliant with OIML R137 1&2 (2014)
- Compliant with MID 2014/32/EU

- MID temperature range -25 to +70ºC
- Short length
- Removable meter cartridge
- 1 x DN straight inlet section required

- Life time lubrication / oil flushing lubrication system
- Multipurpose exchangeable index
- Tamper proof IP67 sealed index
- Seals according EN 549 (seals for gas appliances and gas equipment)

Technical Specification

Metrological approvals: Compliant with EN12261:2002
Compliant with EN12261:A1-2006
Compliant with OIML R137 1&2 (2014)
Compliant with MID 2014/32/EU

ATEX approvals: Sensors compliant with Ex ia IIC T4... T6 Gb (-40ºC ≤ Ta +70ºC)
Encoder compliant with Ex ib IIB T3... T6 Gb (-25ºC ≤ Ta +55ºC)

Flow rates: 3 m3/h up to 25.000 m3/h

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

Body: Compliant to Pressure Equipment Directive 2014/68/EU

Temperature Range: ATEX: -25°C to +70°C
MID: -25°C to +70°C (lower temperatures on request)
PED: -20°C to +70°C (lower temperatures on request)


Body (Standard): Low weight aluminium / steel
Body (Optional): Low temperature steel
Cartridge: Aluminium

Straightening vane: Aluminium
Turbine wheel: Aluminium
Bearing block: Stainless steel / aluminium
Bearings: Stainless steel

Shafts: Stainless steel
Gears: POM
Index frame: Aluminium
Index cover: PolycarbonateECI

Typical metrological characteristics

Accuracy 0,2 Qmax to Qmax: ± 1% or better
Accuracy Qmin to 0,2 Q max: ± 2% or better
Repeatability: better than 0,1%


FMG Gas Meters FMT-S series are NMIM certified by SIRIM and also certified by NMI International.

FMG Gas Meters are NMIM certified by SIRIM

NMI International