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What is two step control and define it.

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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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