| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an SCR sensor with which the measurement accuracy of a quality sensor is maintained even when the residual quantity of a urea storage tank is small. <P>SOLUTION: In the SCR sensor, a quality sensor 122 is disposed between a minimum residual liquid level S and a bottom part 105b of a urine storage tank 105. A dropping tube 131 is disposed, covering from the ceiling part of the urine storage tank 105 to the upper part of space within the urine storage tank 105. A support pillar 174 is disposed from the bottom part to the ceiling part of the urine storage tank 105. The quality sensor 122 and the dropping tube 131 are integrated via the support pillar 174. A foam diffusing region B of urea aqueous dropped from the dropping tube 131 is out of a sensitive region F of the quality sensor 122. <P>COPYRIGHT: (C)2012,JPO&INPIT |
