Yexsensor YEX-NHN-206 Online Ammonium Nitrogen Sensor: High-Precision Ion Selective Technology and Industrial-Grade Stability

In the field of water quality monitoring, ammonium nitrogen (NH4+-N) is a key indicator for measuring water eutrophication and sewage treatment efficiency. The Yexsensor YEX-NHN-206 online ammonium nitrogen sensor adopts innovative PVC membrane ion selective electrode (ISE) technology, combined with a patented reference system design, providing integrators and engineering parties with a fast, accurate and highly cost-effective monitoring solution.

Core Technical Highlights: Patented Design Ensures Long-term Stability

1. Patented Microporous Salt Bridge Reference System

The bottleneck of sensor life usually lies in the reference electrode. Yexsensor adopts patented technology, allowing the internal reference solution to seep out from the microporous salt bridge at an extremely slow speed under a pressure of ≥100KPa.

• Ultra-long life: Durability is more than 50% higher than ordinary industrial electrodes.

• Extremely high stability: Effectively prevents external water sample backflow from contaminating the reference solution, ensuring minimal signal drift.

2. Precise Ion Selective Electrode (ISE) Method

No need for expensive chromogenic reagents. The concentration of ammonium ions in water is directly measured through electrochemical reaction based on PVC membrane.

• Fast response: T90 response time is less than 60 seconds, meeting the needs of real-time process control.

• Multiple ranges available: Provides multiple range options from 0-10mg/L to 0-1000mg/L, suitable for different scenarios from clean freshwater to high-concentration wastewater.

• Full automatic compensation: Built-in Pt1000 temperature sensor eliminates the influence of water temperature fluctuations on electrode potential.

YEXsensor YEX-NHN-206 Online Ammonium Nitrogen Sensor Diversified Application Scenarios

The physical design and communication protocol of YEX-NHN-206 enable it to perfectly integrate into various smart water environments:

• Sewage Treatment Plant Nitrification/Denitrification Process
  Real-time monitoring of ammonium nitrogen concentration in aeration tanks can help operators optimize fan load, precisely control energy consumption, and ensure that effluent ammonia nitrogen meets standards.

• River and Surface Water Automatic Monitoring Stations
  The IP68 protection rating supports long-term submersible installation of the sensor. Combined with RS-485 bus, it can easily connect to remote data acquisition gateways to achieve cross-regional water quality early warning.

• Modern Aquaculture
  Ammonia nitrogen is highly toxic to fish. The Yexsensor sensor can monitor aquaculture water bodies 24 hours a day to prevent economic losses caused by excessive ammonia nitrogen. It is the core sensing unit of smart fishery systems.

• Industrial Wastewater Treatment and Discharge Monitoring
  Suitable for industrial wastewater treatment processes within pH 4-10 range, monitoring residual ammonium nitrogen content after chemical precipitation or stripping processes.

YEXsensor YEX-NHN-206 Online Ammonium Nitrogen Sensor Technical Performance Parameters

YEXsensor YEX-NHN-206 Online Ammonium Nitrogen Sensor Professional Installation and Electrical Integration Instructions

Installation Position and Angle

To ensure pressure balance inside the electrode and response sensitivity, please pay attention during installation:

• No inversion: The sensor must not be installed upside down or horizontally.

• Tilted installation: The installation angle should be tilted more than 15 degrees from the horizontal plane to prevent air bubbles from gathering on the sensing membrane surface.

• Submersible operation: Use 3/4 NPT thread to connect an extension rod and submerge the sensor vertically or tilted into an area with steady water flow.

Electrical Wiring Definition (4-core Shielded Cable)

• Red wire: Power positive pole (12～24V DC)

• Black wire: Power ground (GND)

• Blue wire: RS-485 A (Signal +)

• White wire: RS-485 B (Signal -)

Integrator recommendation: RS-485 communication should use shielded twisted pair cable, and in strong interference environments, the shielding layer should be grounded at one end to ensure data transmission stability.

YEXsensor YEX-NHN-206 Online Ammonium Nitrogen Sensor Maintenance: The Secret to Extending Sensor Life

Initial activation: Before first use, the new electrode must have its protective cover removed and soaked in clean water for 2 hours to restore the activity of the PVC sensing membrane.

Daily cleaning: After long-term operation, if deposits appear on the sensing membrane, gently rinse with deionized water. Do not use organic solvents or hard objects to scrape.

Dry storage: When not in use for more than two weeks, clean it thoroughly, put on the protective cap and store dry.

Interfering ion identification: In special working conditions with high concentrations of potassium ions (K+) or sodium ions (Na+), readings may deviate. Please refer to the interference ion table in the user manual for correction.

Common Questions and Answers (FAQ)

Q1: Can the YEX-NHN-206 sensor measure ammonia nitrogen?

A1: The sensor measures ammonium ions (NH4+) in water. In environments where pH < 9, ammonia nitrogen in water mainly exists in the form of ammonium ions. Combined with the built-in temperature compensation and standard algorithm, it can provide accurate ammonia nitrogen conversion readings.

Q2: Why is a tilt of at least 15 degrees required during installation?

A2: Tilted installation is to use gravity to drain air bubbles from the electrode membrane surface. Air bubbles will hinder ion exchange, causing measurement values to fluctuate or read low.

Q3: How long is the communication distance supported by this sensor?

A3: Based on the RS-485 physical layer, it theoretically supports a communication distance of 1200 meters without repeaters. It is recommended to install a 120 ohm termination resistor for long-distance transmission.

Q4: Is the electrode a consumable? What is the warranty period?

A4: The ion electrode is an electrochemical consumable. Yexsensor provides a one-year warranty for the host of YEX-NHN-206, and a six-month warranty for the electrode part (excluding abnormal use and chemical contamination).

Q5: Can it be used in strong acid or strong alkali environments?

A5: The optimal working pH range of this sensor is 4-10. Exceeding this range will shorten electrode life and increase interference. It is recommended to adjust the pH of the water sample before entering the monitoring point.

Q6: Why is 2-hour activation required before measurement?

A6: The ion selective membrane is deactivated in a dry state. The activation process is to form a stable hydration layer on the membrane surface, which is a necessary prerequisite for obtaining accurate potential.

Q7: How to know if the electrode has failed and needs replacement?

A7: When performing two-point calibration, if the electrode slope is much lower than the standard value, or the response time is abnormally slow (more than 5 minutes), and it remains ineffective after cleaning and activation, it indicates that the electrode has reached the end of its service life.

Q8: Can the sensor be customized with 4-20mA output?

A8: Yes. This model supports RS-485 by default. If 4-20mA analog output is required, please specify when ordering, and we will select the appropriate signal conversion module for you.

Quality Commitment and Service

72-hour aging test: Ensures the stability of electronic components under various voltage fluctuations.

Strict quality inspection: Every product undergoes standard solution verification before leaving the factory to ensure 100% qualification.

Packaging list: Yexsensor sensor (1 pc), product certificate of conformity (1 pc), technical manual (1 copy), 5-meter standard cable (1 pc).