Draw the appropriate Pressure Switch Symbol ?

Draw the appropriate pressure switch symbol in this ladder-logic diagram for a low-pressure alarm which turns on a lamp if the oil pressure of an industrial machine ever drops below 10 PSI:

a low-pressure alarm

Be sure to specify whether the pressure switch needs to be normally-open (NC) or normally-closed (NC).

Answer :

As the diagram shows, this needs to be a normally-closed switch.

pressure switch ladder-logic diagram

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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