APPARATUS FOR MEASURING OF UREA DENSITY

摘要

Disclosed is a urea concentration measuring device for simplifying a structure of a urea concentration measuring sensor by measuring a urea concentration in an electrostatic capacity method in a selective catalytic reduction (SCR) system. The disclosed urea concentration measuring device comprises: a urea tank where urea is stored; and a urea concentration sensor installed in a random location of the urea tank to output a urea concentration measured value by measuring electrostatic capacity changed according to change in a urea concentration. The urea concentration sensor comprises multiple electrode plates for measuring electrostatic capacity changed according to change in a urea concentration, and measures electrostatic capacity by using that potential difference is changed according to a concentration. [Reference numerals] (AA) Ionic migration