Patent ID: 8137625
Filing Date: 2012-03-20
Classification: F01N,G01N,Y10T

Abstract:
1. A urea sensor comprising: a detecting portion, which, in use, is immersed in a liquid accommodated in a urea solution tank, for detecting the thermal conductivity of the liquid so as to detect whether the liquid accommodated in the urea solution tank is an aqueous urea solution; and an enclosing member enclosing a periphery of the detecting portion and including one or more vents penetrating the enclosing member; wherein at least one of the one or more vents comprises a lower vent having a breadth of at least 3.5 mm, said lower vent being disposed such that at least a portion of the lower vent is located closer to a downwardly extending end of the urea sensor than the detecting portion when the urea sensor is positioned for installation in the urea solution tank.