TWO STEP CONTROLLER ACTION
The two step control action which is commonly used in the hydrophore systems of sanitary water and domestic fresh water supply on ships is defined as the action of a controller whose output signal changes from one predetermined value to another when the deviation changes sign.
It is a basic control system which does not fine tune the supply according to the demand but only starts and stops the system when a demand is there and hence it is also called an on—off control system.
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