Abstract: A fluid discrimination apparatus and a fluid discrimination method are provided for carrying out with accuracy a fluid discrimination such as a fluid type discrimination, a concentration discrimination, the fluid existence or nonexistence discrimination, and a fluid temperature discrimination for a discriminated fluid that is stored in a tank or the like. A characteristic measured value as an index value that indicates the characteristics of the fluid to be discriminated is measured, and a discrimination of a fluid is carried out by comparing the fluid discrimination data that indicates the relationship between a fluid that has been measured in advance and a characteristic value of the fluid with the characteristic measured value.

Abstract: Method and apparatus for measuring an amount of ammonia generated from a sample solution being an aqueous urea solution, an aqueous ammonium formate solution, or an aqueous mixture thereof, includes: applying a pulse voltage to a heating element for a predetermined time to heat the sample solution using the heating element; measuring a thermal conductivity-dependent output value and a kinetic viscosity-dependent output value that are electrical outputs dependent on electric resistivity of a temperature-sensitive element; calculating a urea concentration X wt % and an ammonium formate concentration Y wt % in the sample solution from a relationship between the thermal conductivity-dependent output value and the kinetic viscosity-dependent output value; calculating a urea amount A and an ammonium formate amount B in the sample solution from their concentrations and an amount of the sample solution; and determining the amount of generated ammonia with data thus obtained.