Selective catalytic reduction sensor

摘要

A Selective Catalytic Reduction sensor that does not degrade a measurement accuracy of a quality sensor even when a remaining amount of a urea tank is reduced. A quality sensor is installed between a minimum remaining amount liquid level and a bottom portion of the urea tank; a drop pipe is installed from a ceiling portion of the urea tank to a top space in the urea tank; a support is installed from a bottom portion to the ceiling portion of the urea tank; the quality sensor and the drop pipe are integrated through the support; and a bubble diffusion region caused by the urea aqueous solution dropping from the drop pipe is out of a sensitive region of the quality sensor.

主权项

1. An SCR sensor, comprising:
a quality sensor for measuring a liquid quality between a minimum remaining amount liquid level and a bottom portion of a liquid tank; a drop pipe having a drop opening at an upper portion of the liquid tank above the liquid level, wherein the sensor and the drop pipe are connected to a support and together form an assembly extending downward from the upper portion of the liquid tank into the liquid tank, wherein the support guides a float for detecting the liquid level of the tank, wherein a dispensing pipe for dispensing liquid from the liquid tank is installed along the support, wherein the quality sensor is disposed at one side of the dispensing pipe, and wherein the drop opening is disposed on an opposite side of the quality sensor with the dispensing pipe interposed therebetween; and a bubble diffusion region caused by liquid dropping from the drop pipe and being spaced from a sensitive region of the quality sensor.