Rotary piston meter G400


G400 Rotary piston meter DN 100 Qmax 650m³ / h 1: 200

RABO CN114.7 rotary piston gas meters are characterized by large measuring ranges and compact dimensions. They guarantee high accuracy even in the case of small and irregular flow.

Principle of operation

Rotary piston gas meters are volumetric meters for gaseous fluids that work according to the principle of displacement of defined quantities of gas. Thanks to the volumetric measurement, they operate independently of the influences of the installation and are therefore particularly suitable for compact measuring systems with short straight inlet sections. They measure the volume of gas under operating conditions and are approved for custody transfer. Where required, they can be combined with a volume converter for measurement at the basic reference conditions.

Measurement process

In the casing, or body of the meter, which constitutes the measurement chamber, equipped with a gas inlet and outlet section, there are two rotating pistons, the section of which looks like that of an eight (8). They are linked together by synchronization sprockets. When the gas flows, the pistons rotate without contact with each other and provide a constant and repeatable quantity of gas at the outlet, called the cyclic volume. A complete rotation of the system therefore corresponds to the passage of a certain volume of gas. The rotary movement of the pistons is transmitted to the mechanical totalizer by means of a reduction box and a magnetic coupling. The calibration of the measurement error of the rotary piston gas meters is carried out by means of a pair of gear wheels in the totalizer. Operating principle of rotary piston gas meters

Marking and Normative References
Approval: - 2004/22 / EC (MID) - 97/23 / J278EC (J276PED) -94 / 9 / J278EG (ATEX) -2004 / 108 / EG (EMC)
Natural gas, manufactured and LPG
Type of connections
Maximum pressure (Bar)
Type of measurement
Qmin. (m³ / h)
Qmax. (m³ / h)
Pulse emitter
2 low frequency pulse generators (reed contact)
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