1 Scope
This document is applicable to the constructional requirements for thermal energy
meters. Thermal energy meters are instruments intended for measuring the energy which
in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid
called the heat-conveying liquid. The thermal energy meter indicates the quantity
of thermal energy in legal units.
This document covers meters for closed systems only, where the differential pressure
over the thermal load is limited.
This document is not applicable to:
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— electrical safety requirements;
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— pressure safety requirements; and
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— surface mounted temperature sensors.