Identity

The Ammonia Electrochemical sensor is an atmospheric gas analysis instrument using a 3-electrode amperometric cell to measure ambient ammonia (NH3) concentrations within poultry houses.

Overview

The Ammonia Electrochemical sensor is a medium-priority environmental sensor that translates chemical oxidation of ammonia gas into measurable electrical currents. The unit sends continuous data (Modbus or analog) to the Smart Controller, which purges the air if levels exceed safety limits (e.g., 25 ppm). The sensor is prone to drift and complete electrolyte poisoning if continuously exposed to high ammonia, or damage if exposed to direct water and chemical disinfectants.

Structured Facts

Classification

Atmospheric Gas Analysis Instrumentation / Automated.

Purpose

Monitors ambient ammonia levels to prevent toxic environments, respiratory damage, tracheal lesions, and secondary infections in the flock.

Working Principle

Operates as a 3-electrode electrochemical cell. Ammonia gas (NH3) passes through a hydrophobic barrier membrane into an internal electrolyte gel. It undergoes a redox reaction at the catalytic working electrode (2NH3 -> N2 + 6H+ + 6e-). The oxidation releases electrons, creating a current proportional to the ammonia concentration. A third reference electrode maintains stable potential to prevent thermal drift.

Technical Specifications

• Sensor Output Signal: Linear 4-20 mA or digital Modbus signal.

Capacity

• Threshold Limit: Triggers exhaust fans if levels exceed 25 ppm.

Installation Requirements

Sensor pins should be connected using PCB sockets instead of being soldered directly to prevent heat damage to the internal electrolyte and membrane.

Operating Parameters

• Trigger Threshold: > 25 ppm.

Maintenance

Calibrate every 12 months using certified calibration gas. Advanced models run an automatic self-test (SensorCheck™) every 24 hours.

Cleaning & Disinfection

Must avoid direct contact with water or chemical disinfectants, as these destroy the hydrophobic membrane.

Advantages

Highly accurate amperometric tracking, integration with Smart Controller for automated toxic gas purging, built-in thermal drift compensation via reference electrode.

Limitations

Electrolyte dehydration in dry climates reduces sensitivity. High background ammonia saturates the electrolyte causing sensor drift and premature aging. Destroyed by water or liquid disinfectants.

Safety Precautions

Do not wash or spray disinfectants directly onto the sensor body.

Quantitative Data

• Service Life: Expected Operating Life (metrics not explicitly provided, but calibrated annually).

Relationships

• Housing Systems: Closed/intensive environmental housing.
• Environmental Controls: Smart Controller, Exhaust Fans.
• Production Stages: All stages.
• Related Equipment: Smart Controller, Exhaust Fans.
• Diseases: Prevents respiratory damage, tracheal lesions, ocular lesions.
• Maintenance SOPs: Annual calibration, Ammonia Reduction Tree.