| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure concentration of urea water inside a tank by preventing adhesion of bubble foams to a urea water concentration sensor. SOLUTION: In regard to a storage device for urea water 1 as a reducing agent to be added to a selective reduction type catalyst for reducing NOx for purification, the urea water concentration sensor 4 is arranged in the tank 2 for storing urea water 1, and periphery of the urea water concentration sensor 4 is surrounded by a container-like bubble foam guard 6, and the urea water concentration sensor 4 is covered with a foam catching filter 7 formed from a hydrophilic raw material inside the foam guard 6. COPYRIGHT: (C)2006,JPO&NCIPI
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