> For the complete documentation index, see [llms.txt](https://docs.efento.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.efento.io/efento-ble-loggers/using-loggers/special-settings-by-sensor-type/water-leak-sensor.md).

# Water leak sensor

Water leak detection is based on monitoring a voltage drop. When the external probe (water rope) is completely dry, the measured voltage remains within the defined minimum and maximum thresholds. When the rope becomes wet, the voltage decreases. If the measured value falls below the minimum threshold, the device switches its state to **ALARM**. Efento water leak sensors are pre-calibrated at the factory, so initial calibration is not required. If the sensor does not react sensitively enough when the probe is flooded, you may increase the minimum threshold. If the device triggers an alarm despite a dry probe, first check the probe for damage, then consider increasing the maximum threshold.

The acceptable voltage range, during which the sensor reports **OK**, is defined as a percentage of the maximum measured voltage using two calibration parameters: **Minimum threshold**\
(defines the lowest voltage considered normal (no alarm). Default: 75%) and **Maximum threshold**\
(defines the highest voltage considered normal (no alarm). Default: 100%).

## Calibration parameters

| Logic Type        | Defines whether a leak is detected when the measurement (voltage percentage) is inside or outside the defined threshold range. | <ul><li>Normal logic (NO leak if Minimum Threshold ≤ measurement ≤ Maximum Threshold).</li><li>Reverse logic (LEAK detected if Minimum Threshold ≤ measurement ≤ Maximum Threshold).</li></ul> |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Minimum Threshold | The lower boundary (in percentage of supply voltage) for the condition check.                                                  | Range: 0 to 100 % (must not be greater than Maximum Threshold).                                                                                                                                |
| Maximum Threshold | The upper boundary (in percentage of supply voltage) for the condition check.                                                  | Range: 0 to 100 % (must not be less than Minimum Threshold).                                                                                                                                   |


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