Efficient Monitoring of Water Nutrient Salts: YEX-iNHN-306 Digital Online Ammonia Nitrogen Sensor

In environmental engineering and modern agriculture, the content of ammonia nitrogen (Ammonia Nitrogen) is a key indicator for measuring the degree of water eutrophication and biological toxicity. Yexsensor's YEX-iNHN-306 integrated online ammonia nitrogen sensor, based on mature ammonium ion selective electrode (ISE) technology, provides users with an online monitoring solution that requires no chemical reagents, low power consumption, and real-time response.

Technical Core: PVC Membrane Ion Selective Electrode and Ultra-Stable Reference System

The core competitiveness of YEX-iNHN-306 lies in its unique design architecture. Unlike traditional ammonia nitrogen analyzers that require cuvettes and cumbersome reagents, this sensor adopts digital electrode technology:

• Patented ammonium ion probe: The sensor front end integrates membrane technology based on physical PVC encapsulation. When ammonium ions in the water contact the sensitive membrane, a potential difference proportional to the ion activity is generated.

• Microporous salt bridge reference system: The internal reference solution seeps out at a very slow rate through the microporous salt bridge under a pressure of at least 100 KPa (1 Bar). This design ensures long-term stability of the reference potential, making the sensor life significantly better than ordinary industrial electrodes.

• Real-time digital processing: The sensor integrates a high-performance MCU internally, automatically performs temperature compensation (Pt100) and nonlinear correction, and directly outputs digital signals through the RS485 interface, eliminating interference problems caused by long-distance analog transmission.

YEX-iNHN-306 Online Ammonia Nitrogen Sensor Core Technical Specifications

YEX-iNHN-306 Online Ammonia Nitrogen Sensor Wide Application Scenarios and Integration Solutions

YEX-iNHN-306, with its rugged IP68 protection design and simple installation method, can be easily integrated into various water treatment systems:

1. Sewage Treatment Plant Process Control
       In the denitrification and phosphorus removal process, real-time monitoring of ammonia nitrogen concentration in aeration tanks and outlets is the key to optimizing aeration volume and saving carbon source dosing. YEX-iNHN-306 requires no reagents and can be directly installed submersibly, greatly reducing process risks caused by maintenance downtime of traditional monitoring equipment.

2. Smart Agriculture and High-Density Aquaculture
       In recirculating aquaculture systems (RAS), ammonia nitrogen is the main metabolic toxin of fish and shrimp. The sensor can be linked with the system's alarm device to automatically trigger water exchange or enhance biological filtration systems when ammonia nitrogen exceeds the standard, protecting biological assets.

3. Environmental Monitoring Stations and River Chief System Monitoring
       Suitable for long-term automatic monitoring of river, lake and tributary sections. Due to extremely low power consumption (0.1W), it is very suitable for data collection in remote areas with solar power supply systems and wireless transmission modules (such as DTU).

4. Industrial Wastewater Discharge Continuous Monitoring
       Discharge water from chemical, papermaking and leather industries usually contains high concentrations of nitrogen-containing substances. The 100 mg/L large-range option of YEX-iNHN-306 can effectively cope with such high-concentration conditions.

YEX-iNHN-306 Online Ammonia Nitrogen Sensor Installation and Electrical Connection Guide

Physical Installation Specifications

Submersible Installation: The sensor supports direct immersion into water bodies.

Installation Angle: Horizontal or inverted installation is strictly prohibited. The sensor should maintain a tilt angle of at least 15 degrees above the horizontal plane to ensure full contact between the internal electrolyte and the membrane head.

Protection Measures: Avoid the membrane head directly touching river bottom sludge or being subjected to mechanical impact.

Electrical Wiring (4-core twisted pair shielded wire)

• Red (VCC): 12～24V DC power positive pole.

• Black (GND): Power ground and signal ground.

• Blue (485A): RS-485 signal line A.

• White (485B): RS-485 signal line B.

Special Note: Be sure to check the wiring sequence before powering on. Since the cable may be immersed for a long time, users must ensure waterproof sealing treatment of the wiring terminals.

Maintenance and Care Process

To extend sensor life and ensure data accuracy, please strictly follow the following maintenance recommendations:

Initial Use and Activation: Before testing a new electrode, it needs to be soaked in activation solution for 24 hours. If the electrode has not been used for a long time or stored overnight, soak it in distilled water for 10 minutes first, then in dilute ammonium ion solution for 2 hours before use.

Daily Cleaning:

Regularly rinse the electrode with deionized water. If there are deposits on the PVC sensitive membrane surface, gently wipe with a soft cloth and rinse. Do not use organic solvents (such as silicone oil) to contact the electrode.

Calibration Recommendation:

This sensor supports two-point calibration (Zero & Slope). 1 mg/L and 10 mg/L standard solutions are provided with the product. Calibration is only recommended when the measurement error exceeds the allowable range.

FAQ

Q1: Can the electrode of YEX-iNHN-306 be replaced?

Yes. When the electrode still cannot be accurately calibrated or responds slowly after normal maintenance, it indicates that the electrode life has ended. At this time, only the front electrode assembly needs to be replaced, without replacing the entire transmitter body, greatly reducing long-term use costs.

Q2: Which ions will interfere with the accuracy of the ammonia nitrogen sensor?

Due to the use of ion selective electrode principle, some ions in water will cause cross-interference. The main interfering ion is potassium ion (K+), followed by sodium ion (Na+). In environments with extremely high potassium ion concentration, the measurement result may be high. Targeted compensation is recommended when the water quality background is known.

Q3: Does the pH value of the measurement environment affect the result?

Yes. The recommended working pH range of YEX-iNHN-306 is 4～10. In strongly alkaline environments (pH > 10), ammonium ion (NH4+) will be converted into ammonia gas (NH3), resulting in low sensor readings.

Q4: Why can't the sensor be installed horizontally?

Horizontal installation may cause bubbles between the filling liquid inside the electrode and the sensitive membrane, causing circuit interruption or severe numerical drift. Maintaining a tilt angle of more than 15 degrees is a necessary condition to ensure the stability of electrochemical performance.

Q5: Does the sensor need to add chemicals or reagents?

Completely unnecessary. This is the advantage of Yexsensor digital sensors. It generates electrical signals through physical and chemical reactions, without consuming any chemical agents during operation and without producing secondary pollution.

Q6: What is the maximum data transmission distance?

Using the standard RS-485 Modbus-RTU protocol, the theoretical transmission distance can reach 1200 meters. However, when transmitting over long distances, it is recommended to use shielded twisted pair wires to resist industrial electromagnetic interference.

Q7: What should I do if the measured value is continuously unstable?

First check whether the sensitive membrane surface is attached with bubbles or oil stains; secondly, confirm whether the electrode has been sufficiently activated (24 hours); finally, check whether the power supply voltage is stable within the 12-24V DC range.

Q8: Does it support custom cable length?

Yes. The standard configuration is 5-meter shielded cable. You can customize 10-meter, 20-meter or longer cables according to actual engineering needs.

Quality Assurance and Service Commitment

Yexsensor promises that every sensor has undergone 72-hour uninterrupted aging test and multi-point stability test before leaving the factory.

Quality Commitment: If the product batch failure rate reaches 2%, direct return and exchange are supported, and the logistics costs incurred shall be borne by our company.

After-sales Warranty: Provide one-year quality assurance from the date of sale.

Standard Packaging List:

• YEX-iNHN-306 sensor host (1 piece)

• Product manual and certificate of conformity (1 set)

• 1 mg/L and 10 mg/L calibration standard solutions (100 mL each)

• Special activation solution (100 mL)

If you need integration consultation or bulk purchase, please contact the Yexsensor technical support team.