The three metal pins on the bottom of the Shelly Flood sensor are part of its water detection system. Their placement and function are critical for correct operation.
How it works:
- The sensor uses electrical conductivity to detect the presence of water.
- Water must bridge at least two of the pins to complete a circuit and trigger an alert.
- One of these two pins must be the top pin (the one closest to the edge of the device nearest the Shelly logo)
Tips:
- Place the sensor flat on a surface with the pins facing down.
- If it must be placed on its side (e.g., in a shallow drain pan), tilt it so the top pin along with another pin is at the lowest point, allowing it to be submerged as water rises.