A vacuum switch converts a sense pressure or vacuum into a ____________ signal that can be used as an input to controller.

• A. Analog
• B. Digital
• C. Electrical
• D. Pulse

Answer: (C)

Translating a physical parameter into an electrical signal that a controller can read. A vacuum switch senses the vacuum level and then changes its electrical contact state when the set point is reached. That change produces an electrical signal (a current/voltage that the controller reads) which can be used as an input. It’s not inherently an analog signal that varies continuously with pressure, nor is it a timed pulse unless specifically designed to be, so the broad and appropriate description is an electrical signal.