A gutter sensor that is to be used with the PST 5000 de-icing control centre. The sensor is to be installed in the melt-water routes. The sensor is equipped with an NTC resistor that measures the temperature. The sensor is also equipped with a heating element and two metal pipes for the measurement of moisture. The sensor is to be installed (in the direction of the flowing melt water) between the heating cables in the gutter so that it does not touch them. In other words, the metal pipes must point upwards. The connection cable of the sensor can be extended with a 5 x 1.5mm² cable up to 50 metres.