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Connecting a gas meter to a volume converter
In accordance with custody transfer requirements, it is often demanded (or recommended)
that gas meters are connected to electronic devices such as data loggers or volume converters
and data transmission devices. Common S.A. manufactures such devices, e.g. battery/grid-
powered volume converters CMK and data loggers CRS. Common S.A. may deliver such
devices on special orders, together with installation services. Exemplary installations
are presented in Figs. 24 and 25.
Fig. 24. A measurement set of CGT-02 gas meter and CMK-02 volume converter
(the converter is installed in the inflow section)
Fig. 25. Connections between a gas meter and volume converter located outside the Ex zone
and powered from the 220 V power grid
The converter receives three input signals: the flow signal (from the low- or high-frequency
pulse emitter), the pressure signal and the temperature signal. The pressure signal is received
at the pressure measurement output. Installation of three-way CKMT valve (Fig. 26)
on the pressure measurement output (or elsewhere, on a pressure measurement channel)
is recommended. It enables an easy disconnection, removal, inspection and replacement
of pressure transducer, if required.
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