In electrical circuit schematics, a normally...

Question 1 of 270705eccefa3bacbc34ba4d47e8a

In electrical circuit schematics, a normally open pressure switch is represented by which of the symbols shown in the illustration? See illustration EL-0059.

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Question 1 of 27070

In electrical circuit schematics, a normally open pressure switch is represented by which of the symbols shown in the illustration? See illustration EL-0059.

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🔍 Key Concepts

• Difference between normally open (NO) and normally closed (NC) contacts in schematics • How a pressure-actuated switch is indicated compared with a plain limit switch • Matching the small symbol detail (diaphragm, bellows, or process line) to a pressure device rather than temperature or flow

💭 Think About

• First, pick out which of the numbered symbols clearly shows an open contact rather than a closed one—eliminate all that are drawn as closed contacts at rest. • Next, among only the open-contact symbols, look for the one that adds a special mark showing it is pressure operated, not mechanically or manually operated. • Compare the added marks in the symbols: which one best represents a pressure sensing element (like a diaphragm or bellows) instead of a temperature bulb, flow paddle, or simple lever?

✅ Before You Answer

• Verify the chosen symbol shows an open gap between the fixed and moving contact when no pressure is applied. • Confirm the symbol includes a distinct pressure-actuator marking (not just a plain lever, triangle, or generic operator). • Double‑check that other similar symbols correspond to temperature or flow switches in the upper part of the illustration, so you don’t mix up the actuator types.