3 Terms, definitions, and conventions ToC Previous Next

3.2 OPC UA for Compressed Air Systems terms ToC Previous Next

3.2.14 Quantity ToC Previous Next

A Variable representing physical measurements performed by a sensor, or calculations performed by a CASPart or the Main Control System to simulate a physical measurement.

Note 1 to entry: A physical quantity may be measured by an external sensor but is assigned to a specific CASPart.

Note 2 to entry: The measuring sensor may be integrated into the CASPart.

Note 3 to entry: A calculation performed on the Main Control System which is used by a Component shall be assigned to that Component.

EXAMPLE 1 A temperature Quantity is measured by an internal sensor of a compressor at its outlet.

EXAMPLE 2 A pressure Quantity is measured by an external sensor at the inlet and outlet of a filter.

EXAMPLE 3 The isentropic efficiency of a compressor is a Quantity which is calculated by the Main Control System but assigned to the compressor.

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