In nature Ammonium is found only in trace quantities being produced by natural biological activities. Although Ammonium exhibits only low toxicity in general it poses a considerable threat to fishes. Therefore, monitoring the Ammonium concentration is necessary in cooling and waste waters in many industries and in waste water treatment plants.

Operational Principle

The sample is fed into the stripper and sodium hydroxide is added to raise the pH to 14. The equilibrium of NH3 <>NH4+ is driven to the side of the neutral ammonia which is stripped off the sample. The stripped ammonia is trapped in a conductivity measuring cell filled with de-ionized water. The concentration of ammonia is calculated from the increase in conductivity after a pre-set time. The de-ionized water is regenerated before each measurement by an ion-exchanger.

Measuring very low and very high ammonia concentrations

Depending on the configuration and parameter settings the AMX is capable of measuring concentration as low as 10µg/l (ppb) or as high as several thousand ppm. The following curves illustrate the response at very low and very high concentrations. 

High Reliability

By using only high quality components we are able to deliver a very robust instrument with an excellent reliability. Down time for maintenance is just a few hours per year only.

All parts are easily accessible and are replaced in a few minutes. The user himself can do all maintenance work. Down times of the instrument are minimized!