What device triggers a supervisory signal in a fire protection system?

A supervisory signal in a fire protection system is typically triggered by a device specifically designed for that purpose, which is known as a supervisory signal-initiating device. This device continuously monitors various conditions within the system, such as water flow, valve status, or the presence of supervisory signals indicating that a particular system component may not be in its normal operating condition.

In fire protection systems, supervisory signals are crucial for ensuring operational readiness and safety. For instance, if a valve in the standpipe system is closed or a critical component fails, the supervisory signal-initiating device will detect this change and send a supervisory signal to the control panel. This signal alerts personnel or monitoring systems about the need for inspection or maintenance.

Other options may indeed play a role in the overall fire protection system, but they do not specifically trigger supervisory signals in the same direct manner. The alarm system typically focuses on activation during an emergency, while the control panel serves as a central point for monitoring and response but doesn't itself initiate supervisory signals. The water pump is responsible for delivering water and does not relate to supervisory signals. Thus, the most accurate response to the question is indeed the device specifically designed to trigger supervisory signals.