LIQUID REDUCING AGENT STATE DETERMINATION APPARATUS AND CONCENTRATION DETECTION APPARATUS

摘要

This invention provides a liquid reducing agent state determination apparatus which can determine at satisfactory frequencies whether or not a liquid reducing agent being used is proper. The liquid reducing agent state determination apparatus determines the state of a liquid reducing agent transported from a tank. This apparatus generates a detection signal corresponding to thermal properties of a liquid reducing agent which flows through a transportation passage extended from a tank and, further, detects the flow rate of the liquid reducing agent being flown through this transportation passage, determines, based on the generated detection signal and detected flow rate, whether or not the concentration of the liquid reducing agent is outside a predetermined normal range, and generates a liquid reducing agent state determination signal corresponding to this determination result.