| http://www.w3.org/ns/prov#value | - For example, a problem such as a leak in an electric-to-pressure output converter may be determined based on a comparison of input and output signals to the electric-to-pressure output converter (e.g., a signal transmitted from the controller to the electric-to-pressure output converter, a measurement of a gas stream transmitted from the gas supply to the electric-to-pressure output converter, and
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