Global Patent Index - EP 0970457 A1

EP 0970457 A1 2000-01-12 - DEVICE AND METHOD FOR DETECTING SNOW AND ICE

Title (en)

DEVICE AND METHOD FOR DETECTING SNOW AND ICE

Title (de)

EINRICHTUNG UND VERFAHREN ZUR SCHNEE- UND EISMELDUNG

Title (fr)

DISPOSITIF ET PROCEDE DESTINE A LA SIGNALISATION DE NEIGE ET DE GLACE

Publication

EP 0970457 A1 (DE)

Application

EP 98912386 A

Priority

  • DE 19711371 A
  • EP 9801055 W

Abstract (en)

[origin: DE19711371C1] The invention relates to a device for detecting snow and ice which has a sensor arrangement (11) comprising a humidity sensor (13) and an ambient temperature sensor (12). An evaluator switch is controlled according to a humidity sensor- measured variable, producing a control signal at set humidity values for defrosting a surface which is being monitored for snow and ice. The ambient temperature sensor (12) activates the humidity sensor (13) within a temperature range of between +2 DEG C and -12 DEG C. The humidity sensor (13) itself has a PTC heating element, the current consumption of said heating element being used as a measure of humidity. Both the ambient temperature sensor (12) and the humidity sensor (13) are positioned at a mutual distance in a longitudinally extended sensor cartridge (14) made of plastic. The temperature sensor (12) is thermally decoupled from the PTC heating element. The PTC heating element is built into a metal sleeve in such a way that it is corrosion and humidity proof.

IPC 1-7 (main, further and additional classification)

G08B 19/02

IPC 8 full level (invention and additional information)

G08B 19/02 (2006.01)

CPC (invention and additional information)

G08B 19/02 (2013.01)

Citation (search report)

See references of WO 9841958A1

Designated contracting state (EPC)

AT BE CH DE DK FR GB IT LI LU NL SE

EPO simple patent family

DE 19711371 C1 19980827; AT 217110 T 20020515; CA 2284258 A1 19980924; CA 2284258 C 20080408; DE 29717945 U1 19980820; DK 0970457 T3 20020826; EP 0970457 A1 20000112; EP 0970457 B1 20020502; US 6276202 B1 20010821; WO 9841958 A1 19980924

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