Explain fail-safe (fail-open or fail-close) design in instrumentation and why it matters.

Explain fail-safe (fail-open or fail-close) design in instrumentation and why it matters.

• A. It ensures the instrument moves to a safe state on loss of signal or power, preventing unsafe conditions.
• B. It ensures the instrument never changes state regardless of signal loss.
• C. It guarantees digital communication remains uninterrupted.
• D. It changes the control loop to manual operation under fault.

Answer: (A)