1 Scope
This document specifies the measuring conditions, requirements and tests for the construction,
performance and safety of class 1,0 axial and radial turbine gas meters with mechanical indicating devices, hereinafter referred to as a meter(s), having
in-line pipe connections for gas flow measurement.
This document applies to turbine gas meters used to measure the volume of fuel gases of the 1st and 2nd gas families, the composition
of which is specified in EN 437:2021, at maximum operating pressures up to 420 bar, actual flow rates up to 25 000 m3/h over a gas temperature of a minimum −40 °C up to 70 °C, with a range of at least
40 K and for a climatic environmental temperature range of at least 50 K.
This document applies to meters that are installed in locations with vibration and
shocks of low significance and in:
or, if specified by the manufacturer,
and in locations with electromagnetic disturbances.
Unless otherwise specified in this document:
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— all pressures used are gauge;
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— all influence quantities, except the one under test, are kept relatively constant
at their reference value.