| abstract |
(57) [Problem] To provide an ammonia concentration meter capable of simply, quickly and continuously measuring the concentration of ammonia in an aqueous ammonia solution. A probe (2) and an amplifier (3) for measuring the conductivity of an aqueous ammonia solution, and a measured curve (L) And a CPU 4 for converting the ammonia concentration into an ammonia concentration by using a calibration value at one point P, which is an intermediate value in the measurement range, so that the CPU 4 can calibrate the calibration curve L over the entire measurement range. It is. |