Teracom TSF400-0, Water Leak Detector With Digital Output

The TSF400-0 is a waterproof water-leak detector designed for early detection of unwanted water presence in technical and industrial environments. It is suitable for installation on floors, in drainage trays, or inside equipment enclosures where water ingress must be detected quickly and reliably. The detector provides an N-channel open-drain digital output, allowing straightforward integration with PLCs, controllers, and building automation systems. The device is capable of responding to very small amounts of water, including slight floor wetting or residual moisture, such as after cleaning. The TSF400-0 is intended for continuous operation in applications where reliable water-leak detection is required to protect equipment and infrastructure.

Detection principle and electrode layout
The bottom surface of the TSF400-0 enclosure contains five electrodes used for water detection. The central electrode is the active sensing element, while the four surrounding electrodes are connected to ground. When the device is placed on the floor, the electrodes come into contact with the surface. The presence of water forms a conductive path between the central electrode and any of the surrounding ground electrodes, which triggers the detector and changes the output state. The electrode arrangement allows reliable detection of water from any direction around the device.