YEX-NHN-406-S Online Ammonia Nitrogen Sensor: High-Precision Ion Selective Electrode Monitoring Expert

In modern water quality management and wastewater treatment processes, real-time monitoring of ammonia nitrogen (NH4-N) is a core indicator for evaluating water eutrophication and treatment efficiency. The YEX-NHN-406-S integrated online ammonia nitrogen sensor launched by Yexsensor provides system integrators and environmental engineers with a fast, accurate, and highly cost-effective digital monitoring solution thanks to its unique PVC membrane ion selective electrode (ISE) technology and intelligent signal processing algorithms.

Core Technology: Patented Ion Selective Electrode (ISE)

Unlike ordinary industrial electrodes that frequently fail on the market, Yexsensor adopts patented ammonia ion electrode technology in the YEX-NHN-406-S:

• High-Pressure Microporous Salt Bridge: The internal reference solution slowly oozes through the microporous salt bridge while maintaining at least 100 KPa (1 Bar) internal pressure. This design ensures extremely high stability of the reference system and effectively prevents external pollutants from flowing back into the electrode.

• Long-Life Structure: Thanks to the extremely slow electrolyte consumption rate, the expected service life of this sensor far exceeds that of conventional industrial electrodes, significantly reducing users' later maintenance costs and replacement frequency.

• Real-Time Temperature Compensation: Integrated high-precision Pt1000 temperature sensor corrects electrode potential drift caused by temperature fluctuations in real time, ensuring accurate readings even in fluctuating environments from -5 to 40°C.

Excellent Product Features

1. Dual Digital and Analog Output
To be compatible with various industrial environments, the YEX-NHN-406-S not only supports standard RS-485 Modbus/RTU digital communication but also offers optional 4-20mA analog current output. This allows seamless connection to PLC, DCS, industrial control computers, and various IoT gateways, greatly simplifying on-site wiring.

2. Highly Adaptive Industrial Housing
The sensor housing is made of POM (acetal) and 316L stainless steel, offering excellent corrosion resistance. Its IP68 protection rating ensures the device can operate stably for a long time in harsh outdoor and underwater environments without being affected by moisture or water seepage.

3. Flexible and Convenient Installation Design
The sensor comes with a 3/4 NPT pipe thread at the tail. Whether using immersion installation or installing in a circulation pipeline via a tee, it can be easily sealed. It is very suitable for biological tanks in wastewater treatment plants or industrial circulating water systems.

4. Ultra-Low Operating Power Consumption
Under 12V power supply, the operating power consumption is only 0.2W. This means that in remote monitoring stations, a small solar panel combined with a battery can maintain uninterrupted system operation for a whole year.

YEX-NHN-406-S Online Ammonia Nitrogen Sensor Detailed Technical Specifications

Application Scenarios of YEX-NHN-406-S Online Ammonia Nitrogen Sensor

1. Wastewater Treatment Plant Process Control (Biological Denitrification)
In A2/O processes, the ammonia nitrogen sensor can be installed in the aeration zone or outlet of the biochemical tank. Through real-time data feedback, the system can precisely control fan frequency (aeration volume), achieving fine operation while ensuring ammonia nitrogen meets discharge standards and significantly reducing energy consumption.

2. Modern Factory Recirculating Aquaculture Systems (RAS)
Ammonia nitrogen produced by fish excretion is highly toxic in aquaculture. The YEX-NHN-406-S provides second-level concentration updates and connects to intelligent monitoring terminals via Modbus. Once ammonia nitrogen exceeds the safe threshold, the system can immediately trigger drainage or oxygenation equipment to protect aquaculture assets.

3. Surface Water and River Section Monitoring
For river chief system monitoring stations, the sensor can be integrated into buoys or shore stations. Even in wild environments with large water quality fluctuations, its patented salt bridge design can effectively cope with high suspended solids, providing continuous data support for environmental management departments.

4. Industrial Circulating Cooling Water Systems
In certain processes, nitrogen-containing pollutants in circulating water can cause pipeline corrosion or algae outbreaks. The YEX-NHN-406-S can monitor water quality changes online and guide chemical dosing to optimize water treatment processes.

Maintenance and Care Strategy

Ion selective electrodes are precision chemical analysis components. Reasonable maintenance can significantly improve their accuracy:

• Initial Activation: Before formal testing, the electrode must be immersed in special activation solution for 24 hours, then cleaned with deionized water.

• Sensor Storage: When not in use for more than two weeks, do not store dry; cover with a protective cap containing protection liquid.

• Interfering Ion Management: Pay attention to potential interference from potassium ions (K+) and sodium ions (Na+) on the ammonia nitrogen electrode (see interference table in the manual). In applications with excessively high interfering ion concentrations, coefficient correction is required.

• Installation Angle: Do not install upside down or horizontally. The sensor should be installed at an angle of at least 15 degrees from the horizontal plane to ensure full contact between the internal electrolyte and the membrane.

FAQ

Q1: Does the YEX-NHN-406-S require frequent calibration?

A: The sensor is calibrated before leaving the factory. In relatively stable water quality environments, it is recommended to verify data every 1-2 months. If water pollution is severe, shorten the verification cycle according to site conditions.

Q2: Does potassium ion (K+) have a big impact on measurement?

A: Ion selective electrodes (ISE) have some sensitivity to ions with similar charge and radius. Potassium ion is the main interferent. If your application environment has extremely high and fluctuating potassium ion concentrations, please inform Yexsensor engineers so we can provide compensation algorithm guidance.

Q3: Why does the reading response become slow?

A: This is usually because biofilm or protein has deposited on the PVC membrane surface. You can gently rinse with deionized water. If it fails, the electrode head may need replacement.

Q4: Can the sensor be directly connected to my cloud platform?

A: Yes. As long as your cloud gateway supports Modbus/RTU protocol, you can directly read ammonia nitrogen and temperature values through the RS-485 interface.

Q5: Can the measuring range be customized?

A: We provide two standard ranges: 0-100 mg/L and 0-1000 mg/L. If you have special requirements for extremely low concentration (<1 mg/L) or extremely high concentration, please contact us for technical evaluation.

Q6: Can 4-20mA signal and RS-485 be used simultaneously?

A: Yes. This model supports dual signal synchronous output. You can connect 4-20mA to a local display instrument and RS-485 to a PLC for logic control.

Q7: What are the pH requirements during installation?

A: It is recommended that the pH value of the water sample be between 4 and 10. Exceeding this range may cause changes in the ionic form and affect the accuracy of electrode readings.

Q8: Can the sensor be used in seawater?

A: The stainless steel and POM materials have certain corrosion resistance, but high sodium and magnesium ions in seawater will significantly interfere with accuracy. Please contact us for a salinity compensation solution before using in seawater.

Summary: A Reliable Digital Water Quality Component

The Yexsensor YEX-NHN-406-S is born to solve complex challenges in industrial field applications. Whether it is its patented pressure salt bridge technology or the highly integrated digital signal output, it aims to reduce on-site commissioning time for system integrators and provide end users with a long-term stable data window.

Does your monitoring project need a more reliable ammonia nitrogen solution?

We understand that every monitoring station carries the responsibility of environmental compliance. Contact Yexsensor immediately to get detailed technical communication protocols and preferential quotations. Our technical team will assist you throughout the entire process from solution design to on-site commissioning.

Contact us now to obtain a copy of the YEX-NHN-406-S technical specification sheet.