What is the purpose of an independent high-level alarm?

• A. To monitor temperature only
• B. To separate from normal tank measuring systems. It is a critical device, the last line of defense.
• C. To control pump speed
• D. To log production data

Answer: (B)

An independent high-level alarm is a safety feature that triggers an alert or automatic action when tank level hits a dangerous high point, and it is designed to operate separately from the normal tank measurement and control system. This independence ensures that a fault in the primary measurement or control loop won’t disable the alarm, providing a reliable last line of defense. When the level continues to rise beyond the safe limit, the alarm can prompt operator response or initiate automatic actions (such as stopping a pump or isolating the process) to prevent overflow, spills, or equipment damage. It’s not about temperature monitoring, pump speed control, or logging production data—those serve different functions. The core idea is a fail-safe, independent alert that protects the system even if the primary instrumentation fails.