SentryPlus Alert® technology provides a solution for relief valve flood detection. When activated with an add-on connection kit, the flood sensor included with select relief valves can signal excessive discharge resulting from heater, expansion tank, or other equipment malfunction through a building management system (BMS). This allows for the notification of a potential flooding event or maintenance need.

When connected to a boiler relief valve equipped with flood sensor technology, the Sensor Control Monitor delivers potential flooding alerts to a BAS by RS‑485 Modbus or to the Nexa® platform through wireless communication. Alerts are initiated as soon as the control terminals detect a flowing discharge signal from the sensor activation module mounted to the discharge line, providing timely awareness and enhanced flood protection.

The connection kit is sized for the relief valve outlet, diameters ranging from 3/4" to 2 1/2". Check the relief valve specification to verify outlet size. Connection kits include a flood sensor and activation module for new or existing installations.

Flood Detection for Relief Valves

Watts Series 140, LF140, 174A, LF174A, N240, LFN240, 340, LF340, 342, 374A, 740, 40L, LF40L, LL40XL, LFLL40XL