The AM200 analyser has been developed to match with most of applications where a continuous analysis of NH4+ in water is necessary.

The AM200 uses a UV spectrophotometric measurement method. This very reliable method gives the AM200 the advantage of a very long term stability of the measurements and makes the analyser insensitive to probe damage due to aggressive water.

A very low amount of NaOH (1 mL of diluted NaOH solution) is first injected in sampled water in order to perform the measurement. The chemical equilibrium between NH4+ and NH3 in water is displaced in favour of NH3 because of the pH. This displacement of equilibrium is pretty total if pH>12 and causes NH3 to give off from the solution. A certain amount of NH3 depending on temperature passes in gas phase and UV spectrometric measurement is then performed on the gas.

HENRY’s law related to liquid/gas equilibrium is then applied and allows the precise determination of the amount of ammonium present in water by the analysis of outgased NH3.

Advantages:

• Online ammonium monitoring: 0,15 – 20 mg/L NH4+; 0,5 – 1000 mg/L NH4+; other ranges on request
• Quick results : measurement in less than 3 minutes.
• Insensitive to turbidity and water coloration: Exclusive measurement method on gas phase.
• Reliable measurement in the long run: Automatic cleaning system; Zero adjustment system.
• Compact size.