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NH4-N - What is ProAm Ammonia?

Ammonia –our process

Ammonia measurement is an important water quality parameter used to indicate water pollution. Ammoniacal-nitrogen may be determined using on-line instrumentation or by using portable/laboratory water analysis. The continuous testing of water to determine the ammonaical-nitrogen comprises a typical final effluent monitoring system used within water intake protection schemes. Ammonia measurement identifies the presence of untreated sewage and the risk of water pollution.

Different methodologies

Ammoniacal-nitrogen can be determined in several ways but in principle two methodologies predominate; colormetric and ion selective electrodes (ISE). Colormetric techniques use a reagent to produce a colour change proportional to concentration which is then measured photometrically. ISE techniques fall into two categories; direct ammonium determination which has limited application and a much more precise technique using a gas sensitive ammonia ISE requiring pH adjustment of the sample.

WTW IQ Sensor Net multi-parameter ammonia instrument
MIQ-TC2020XT multi-parameter controller
WTW Visolid IQ Sensor Net ammonia sensor
AmmoLyt - Plus 700 IQ- ammonium sensor
PPM Proam ammonia analyser
ProAm Ammonia Analyser


Our design

Pollution and Process Monitoring have optimised the ammonia ISE methodology for on-line measurement of ammoniacal-nitrogen. The ProAm is a hybrid of many other designs packaging the technology in a simple, compact format and addressing the common pitfalls associated with other products. The ProAm uses large diameter tubing to deliver the sample to a reaction vessel where the pH is adjusted. No sample preparation is required for applications containing solids to 200mg/l (intake protection and final effluent monitoring) removing an un-necessary point of blockage, reducing maintenance and installation costs. To ensure operational reliability, automatic chemically cleaning can be used to removed chemical and biological contaminants at a frequency to suit the application. Internally, pinch valve technology is used to reliably deliver the sample, calibration standards and cleaning fluids which pass through a heat exchanger to regulate temperature ensuring good reproducibility. The technique can be run continuously without interference from suspended solids although intermittent analysis may also be selected to further minimise reagent consumption.