Working Principle of the Early Warning System in Online Ammonia Nitrogen Analyzers

Online ammonia nitrogen analyzers are critical for continuously monitoring water quality in sources like rivers, lakes, and wastewater treatment plants. Their integrated early warning system is vital for the prompt detection of pollution events, allowing for immediate corrective actions. The system operates through a seamless process of measurement, evaluation, and alerting.

1. Core Measurement Principle:
Most modern online analyzers utilize the colorimetric method, specifically the reaction with salicylate and hypochlorite. Here’s a simplified process:

• Sample Preparation: A water sample is automatically collected and filtered.

• Chemical Reaction: Reagents are added to the sample. Ammonium ions (NH₄⁺) react to form a green-colored compound.

• Optical Detection: A photometric sensor measures the intensity of this green color, which is directly proportional to the ammonia nitrogen concentration in the sample.

2. The Early Warning Mechanism:
The analyzer's internal computer (PLC) continuously receives concentration data from the sensor. The warning system functions based on two primary triggers:

• Threshold Alerting: Operators pre-set safe concentration limits (e.g., a warning level and a critical alarm level). If the measured value exceeds these predefined thresholds, the system is immediately triggered.

• Trend Analysis: Sophisticated systems can also monitor the rate of concentration change. A sudden, sharp increase (a positive trend spike), even if the absolute value is still below the critical limit, can activate a pre-warning. This is crucial for anticipating a major pollution event before it reaches its peak.

3. Activation of Alarms:
Once a trigger condition is met, the warning装置 (device) activates multiple alert protocols simultaneously:

• Visual Alarms: Flashing lights or prominent warnings on the analyzer's touchscreen display.

• Audible Alarms: A local siren or buzzer to alert nearby personnel.

• Remote Alarms: The system sends out automated alerts via SMS text messages, emails, or directly into centralized SCADA or plant management software. This ensures that responsible personnel are notified 24/7, even off-site.

In summary, the early warning system transforms the analyzer from a mere measuring instrument into a proactive sentinel. It works by automatically and accurately measuring ammonia levels through photometric analysis and instantly communicating any dangerous or anomalous conditions through a multi-stage alert process, thereby safeguarding water resources and operational processes.