What is the purpose of a redundancy plan for critical sensors?

• A. To maintain continuous monitoring and minimize downtime during maintenance or failure.
• B. To increase maintenance downtime.
• C. To replace sensors with non-critical ones.
• D. To reduce monitoring coverage.

Answer: (D)

Redundancy for critical sensors is about keeping monitoring active even when something goes wrong. By having backup sensors ready to take over if a primary sensor fails or is offline, the system maintains continuous visibility into critical conditions. This approach reduces downtime because there’s no long gap in data or alarms—the transition to a functioning sensor is seamless or nearly so. It also improves resilience, since maintenance, upgrades, or unexpected failures don’t interrupt the ability to monitor and respond.

Think of it as built-in backups that share the load and can instantly assume responsibility. This is why the goal is to preserve monitoring and uptime, not to prolong maintenance, weaken coverage, or swap in sensors that aren’t critical to the sensing need. Redundancy keeps the overall picture intact and ensures ongoing situational awareness.