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Pressure measurement instruments - U-tube Manometer, Mercury Barometer & Aneroid Barometer
Shipboard machinery must operate within certain desired parameters.
Instrumentation enables the parameters—pressure, temperature, and
so on—to be measured or displayed against a scale. A means of control is
also required in order to change or alter the displayed readings to meet
particular requirements. Control must be manual, the opening or
closing of a valve, or automatic, where a change in the system parameter
results in actions which return the value to that desired without human
involvement.