NH3-100 Ammonia Gas-Sensing Electrode

Overview

The NH3-100 is an advanced gas-sensing electrode specifically designed for measuring dissolved ammonia (NH3) in water. Unlike standard ammonium electrodes, this sensor measures the un-ionized ammonia form, which is particularly toxic to aquatic life. This makes it essential for aquaculture, wastewater treatment, and environmental monitoring.

Key Features

• Gas-Sensing Technology: Measures dissolved ammonia (NH3), not just ammonium ions
• Wide Range: Measures from 0.05 to 1,400 mg/L (ppm)
• Dual Output Options: Supports both RS485 Modbus RTU and 4-20mA current output
• Fast Response: Results within 60 seconds
• Automatic Temperature Compensation: Integrated PT1000 sensor for accurate readings
• Direct Connection: Connect directly to computer or PLC without additional instrumentation
• High Protection: IP68 waterproof rating ensures reliable operation

Applications

• Aquaculture and fish farming
• Shrimp farming systems
• Wastewater treatment plants
• Industrial effluent monitoring
• Environmental water testing
• Hydroponic systems
• Biogas production
• Agricultural runoff assessment
• Drinking water source monitoring
• Laboratory analysis

Technical Specifications

The NH3-100 delivers precise dissolved ammonia measurements from 0.05 to 1,400 mg/L with automatic temperature compensation. The gas-sensing membrane selectively detects NH3 molecules that diffuse across the membrane, providing specific measurements of the toxic un-ionized form.

Understanding Ammonia vs. Ammonium

In water, ammonia exists in two forms:

• NH3 (Ammonia): Un-ionized form, toxic to fish and aquatic life
• NH4⁺ (Ammonium): Ionized form, less toxic

The ratio between these forms depends on pH and temperature. The NH3-100 specifically measures the toxic NH3 form, critical for aquaculture safety.

Connectivity and Integration

With its RS485 Modbus RTU interface, the NH3-100 seamlessly integrates into modern SCADA systems and IoT networks. The 4-20mA current output option ensures compatibility with traditional industrial controllers and data acquisition systems.