Automatic detection equipment for foam concentrate injection must have complete supervision so that which condition occurs on failure, loss of supervising air pressure, or loss of electric energy?

• A. It continues to operate normally
• B. It provides no indication
• C. It results in clear notification of the abnormal condition
• D. It triggers automatic shutdown of the entire system

Answer: (C)

Complete supervision means the detection system is continually monitored so that any loss of the supervising signal—whether from air pressure or electrical energy—produces a clear alarm or indication of an abnormal condition. This ensures that a fault in the supervision doesn’t go unnoticed and the foam injection system isn’t thought to be functioning when it’s not. The purpose is to prompt immediate attention and restoration of supervision, not to hide the fault or leave operators guessing.

If the supervising energy is lost, you want a definite notification—an alarm, light, or other alert on a central panel—so maintenance can intervene. Silent failures or silent continuation of operation would defeat the safety intent. Automatic shutdown of the entire system isn’t the desired outcome solely from loss of supervision; the priority is to make the abnormal condition unmistakable so it can be addressed promptly.