What is the function of tamper switches in a sprinkler system?

The correct function of tamper switches in a sprinkler system is to monitor valve position. Tamper switches are designed to signal whether a control valve, such as a sprinkler control valve, is in its open or closed position. This monitoring is crucial because the effective operation of a sprinkler system relies on the control valve being properly positioned to allow or restrict water flow as necessary.

When a valve is closed (either intentionally, for maintenance, or due to a malfunction), the tamper switch detects this position and sends an alert to the fire alarm system or central monitoring panel. This helps ensure that any issues with the valve position are promptly addressed to maintain the system's readiness to function in the event of a fire.

The other options relate to functions that are not specific to tamper switches. For example, controlling water flow pertains to the valve itself rather than the monitoring switch. Indicating water pressure involves pressure gauges or indicators, and activating the sprinkler head is determined by the detection of heat from a fire, not by tamper switches. Thus, the role of tamper switches is uniquely focused on monitoring the status of control valves in the system.