What is a piv tamper on a fire alarm?

A PIV (Post Indicator Valve) tamper on a fire alarm system is a device that monitors the position of the post indicator valve, which controls the flow of water in fire protection systems. If the valve is tampered with or closed, the tamper switch activates an alarm, alerting personnel to a potential issue that could affect firefighting efforts. This ensures that the water supply remains accessible and operational during a fire emergency.