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Delta Rotary Positive Displacement

Delta Rotary Positive Displacement

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  Delta meters are volumetric meters. The flow of gas moves the pistons and each rotation traps and transfers a specific volume of gas. The movement is mechanically transmitted to the totaliser through the magnetic coupling. 

  • Excellent metrological stability attested by customers over the years
  • No influence of installation conditions nor stop-and-go flow rate on the metrology
  • Large rangeability approved by the DRIRE, NMI, PTB and various other official bodies.
  • MID approved
  • Optimised pressure loss for low pressure network
  • Available in aluminium, ductile iron, or steel, for all applications

Delta meters are designed to measure natural gas and various filtered, and non-corrosive gases. They are used when very accurate measurement is required, when the gas flow can be low or irregular. Due to the volumetric principle of the Delta meter, its metrology is not influenced by installation conditions. Consequently, it can be used to build very compact stations without installing a straight pipe inlet before the meter. Delta meters are approved for fiscal use.


Flow rate from 0.4 m3/h to 1000 m3/h

Nominal diameters  G10 to G650DN 40 to DN 150 (1”1/2 to 6”)

Maximum working pressure  up to 100 bar depending on the body material and flanging

Body materials aluminium, ductile iron or steel

Compliant with the Pressure Equipment Directive 97/23/EC

Temperature range   PED: -30° C to +60° C    MID: -25° C to +55° C

Storage temperature: -40° C to +70° C

Metrology  In accordance with the EC and OIML, large rangeability up to 1:200, depending on the G-size Approvals EC (PTB): 1.33-3271.3-ROM-E11

Intrinsic safety approval L.C.I.E. 06 ATEX 6031 X - Compliant with the Directive 94/9/EC.

Large rangeability (PTB): 1.33-3271.3-ROM-N05

Compliant with the Measuring Instrument Directive 04/22/EC 

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