FMT-S Turbine Gas Flow meter

The 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 the 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 to the 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 aluminum meter bodies. As an example, the weight of a 12” (DN300) ANSI300 FMT-S is less than 45 kg.


The operation of the FMT-S series of turbine meter is based on the measurement of the velocity of the 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 to 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 comes 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 aluminum (steel on request). Due to the extremely low weight of these aluminum bodies, the meter can be transported easily and exchanged without special equipment.

Technical Data

Housing Polycarbonate
Dimensions 193 x 160 x 73 mm
Weight  1.2 kg
Protection class IP66 (EN 60529)
Ambient temperature  -25ºC to +70ºC
Control panel 6 button keypad
Display Graphical LCD display with backlighting
Power Supply Lithium battery
Operating time > 6 years in defined condition
Optional intrinsic safe power supply
Type of battery SAFT standard lithium battery (D-size, 3.6V/17Ah)
Measuring temperature range  -25ºC to +60ºC
Measuring pressure ranges (bar abs)
MID certified
Standard ranges  0.8 – 5.2; 2 – 10; 7 – 35; 14 – 70
Enhanced ranges  0.8 – 10; 4 – 70
Without MID  0.8 – 5.2; 0.8 – 10; 0.8 – 20; 0.8 – 35; 0.8 – 70
Accuracy <0.5% from measured value (MID)
Communication interface  RS-232 / RS-485 serial interface
Optical interface (IEC-1107)
PSTN/GSM/GPRS and Radio modem
Communication speed RS-232 / RS-485: 9.6 to 57.6 kbit/sec
Optical interface (IEC-1107): 9.6 to 38.4 kbit/sec
Digital inputs 4 digital inputs (configurable as LF, HF or binary)
Digital outputs 4 digital outputs (configurable as pulse or binary output)
Analogue outputs up to 4 analogue outputs by using external Current Loop module 4-20 mA
Approved according the European metrology standard TCM 143/09-4664
EN12405-01 and 2004/22/EC (MID)
ATEX approved for installation in hazardous area FTZU 08 ATEX 324X
Directive 94/3/EC (EN60079-0, EN60069-11) II 2G Ex ia IIC T4/T3
Standard delivery  User Manual
TRIPPLE – service and data collection software
Optional accessories:
Installation material Thermowell, mounting kut, three way tap DIN 3 PN 100
Power supply  Intrinsically safe power supply
Module for current loop  CL-1 (4-20 mA)
Separation and communication module  DATCOM-K3
Digital pressure transducers Pressure transmitter EDT 23,
Temperature transmitter EDT 34
Optical probes  Infrared head HIE-03 (RS-232)
Infrared head HIE-04 (USB)
GSM/GPRS communications DATCOM-AMR1
Expansion module for digital transducer Expansion module RS-485

Download Datasheet: FMT-S Turbine Gas Meter-Flow meter Group

Ref :

Other Article: