Products > Environment > Water > NH3N-2000


With the years of experiences on process analysis and environmental monitoring instrument development, the Focused Photonics Inc has developed the NH3N-2000 series ammonia nitrogen online analyzer, which is a new generation in the world. The instrument is designed for automatic ammonia nitrogen monitoring on several types of water matrix. Such analyzer adopts advanced sequential injection platform, combining with national standard detection method, which ensures reliable and accurate results. With high level of robustness in the electronics, mechanics and hydraulics components, the analyzer requires very little maintenances. The analyzer provides multiple standard interfaces, which are easy to combine other available instruments, such as flowmeter, pH meter, etc, therefore remote monitoring can be achieved.

The analyzer can be equipped selectively with corresponding pretreatment system for thoroughly meeting the demands of various working conditions and various customers.


  • High reliability, low maintenance;

  • Accurate measurement, wide applicable scope;

  • Safe operation, efficient analysis.

Operational Principle

Based on the standard method and new technical platform, the ammonia nitrogen which exits as the form of free ammonia ions in samples and the Nessler’s reagent will react to produce yellowish brown complex in the alkaline medium.

The reaction product will be measured with a colorimeter and the absorbance is proportional to the ammonia nitrogen concentration in the sample.


Technical Specifications

Measuring PrincipalColorimetric, Nessler’s reagent methodMTBF≥720h every time
Measuring Range                                                     (0~5) mg/L,(0~50) mg/L,(0~300) mg/L;(automatic bracket range, which can switch full-automatically)Linearity±0.2%
Zero Drift±2% F.S/weekRepeatability≤±3%F.S.
Range Drift±2% F.S/weekSingle measurement time≤7min/pic
Clean, Zero adjustment formAutomatic/manualReagent Offer reagent and its formula for per month’s analysis according to actual situation.
Clean, Zero adjustment IntervalCan set interval time optionallyMeasurement Method Continuous/Timed/ periodic
Maintenance period3 monthsSignal output2 paths of 4-20mA output; RS-485/232
Data StorageRealize data storage and query functionAnalog Input2 paths of 4-20mA input
Resolution0.01mg/LDigital CommunicationRS232/RS485
Detection limit0.05mg/LPower100-240VAC/48-63Hz
Measurement IntervalAutomatic measuring period for zero adjustment;                                                    can set continuously in    5,10,15,20,25,30 minutesFunctionAutomatic two-point adjustment, automatic clean, self-diagnosis; can output alarm signal with reagent exhausted when reagent blocks the pipeline.


  • Pollution source monitoring

  • Surface water monitoring

  • Industrial process water monitoring

  • Municipal wastewater monitoring