Check if the cone of the rain sensor is not filled with dirt/leaves which could block the way of water into the gauge. This may be caused by the accumulation of dust, corrosion, or deposits. Solutions. However, like any other piece of equipment, rain gauges can experience problems that affect their accuracy and performance. Problem: Incorrect Placement One of the most. Rain sensors are valuable devices designed to detect rainfall, commonly applied in meteorological observations, hydrological monitoring, and automated control systems. When raindrops are detected, the sensor triggers the wiper system to activate automatically, ensuring clear visibility for the driver. 2 mm). Under no circumstances will Hydreon be liable for any consequential damages due to failure or any other mishap involving a Rain Gauge.