Ammonia Nitrogen Monitor HC-200NH

By: Akio ISHI, Yuichi ITO, Hiroaki MURAKAMI

3 January 2016


Because the electric power for the air blower to be used for the aeration tank on sewage plant is large, an adequate blower control with ammonia nitrogen concentration is expected. The ion electrode method enables continuous measurement. However the instability of the ion electrode method often is an issue for applying the process control. The cause of the instability is that the inner solution of ion electrode is diluted. The control of the osmotic pressure of the inner solution prevents diluting inner solution. The prototype was installed in a sewage water plant for a long term stability test and stable measurement was confirmed.

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