JW-NHN-406(K11) Online Ammonia Nitrogen Sensor is designed for continuous ammonium and ammonia nitrogen monitoring in wastewater treatment, surface water, aquaculture, industrial discharge, process tanks, and smart water quality systems. Based on an ion selective electrode method with automatic temperature compensation, it provides fast and stable ammonia nitrogen and temperature data through RS485 Modbus RTU and optional 4–20mA output.
2. Product Overview
JW-NHN-206(K10) online ammonia nitrogen sensor is engineered for continuous measurement of ammonium ion concentration in water. It uses an ion selective electrode method based on a PVC membrane ammonia ion electrode, with automatic temperature compensation to support fast, stable, and cost effective online monitoring.
The sensor supports RS485 Modbus RTU communication and optional 4–20mA output, making it easy to connect with PLCs, DCS systems, industrial computers, universal controllers, paperless recorders, touch screens, RTUs, telemetry terminals, and IoT cloud platforms. It is suitable for wastewater treatment plants, aquaculture systems, industrial discharge monitoring, environmental water stations, and smart water quality projects.
Item
Specification
Product Type
Online Ammonia Nitrogen Sensor
Measurement Principle
Ion selective electrode method
Electrode Type
PVC membrane ammonium ion electrode
Housing Material
PVC 316L POM for NHN-406
Measuring Range
0–10.00 mg/L
Measuring Range
0–100.00 mg/L
Measuring Range
0–1000.0 mg/L
Resolution
0.01 mg/L or 0.1 mg/L depending on range
Temperature Resolution
0.1°C
Accuracy
±10% of reading or ±1 mg/L for 0–10 mg/L range
Accuracy
±10% of reading or ±0.5°C related specification for 0–100 mg/L range
Accuracy
±10% of reading ±0.5°C related specification for 0–1000 mg/L range
Response Time
T90 less than 60 s
Detection Limit
0.09 mg/L for 0–10 and 0–100 mg/L ranges
Detection Limit
0.9 mg/L for 0–1000 mg/L range
Calibration
Two point calibration
Temperature Compensation
Automatic Pt1000 compensation
Output
RS485 Modbus RTU
Optional Output
4–20mA
Storage Temperature
-5°C to 65°C
Working Temperature
0°C to 40°C
Working Pressure
<0.1 MPa
Working pH Range
4–10 pH
Installation
Submerged installation 3/4 NPT
Power Supply
12–24V DC
Power Consumption
0.2W at 12V
Protection Grade
IP68
Cable Length
Standard 5 m customizable
Connector
M16 5 pin waterproof male connector
3. Application Scenarios
Wastewater Treatment Monitoring: The sensor can be used for ammonia nitrogen monitoring in municipal wastewater plants, industrial wastewater treatment, aeration tanks, outlet monitoring points, and discharge supervision systems.
Aquaculture Water Quality Monitoring: It is suitable for shrimp ponds, fish ponds, recirculating aquaculture systems, and aquaculture water treatment projects where ammonia nitrogen concentration needs continuous tracking.
Surface Water Monitoring: The sensor can be deployed in rivers, lakes, reservoirs, canals, and environmental monitoring stations to support ammonia nitrogen pollution trend analysis.
Industrial Process Water: It supports process water, recycled water, cooling water, and industrial discharge monitoring where ammonia nitrogen data is required for water quality control.
Smart Water IoT Systems: With RS485 Modbus RTU and optional 4–20mA output, the sensor can be integrated with RTUs, gateways, telemetry terminals, SCADA systems, cloud platforms, and alarm dashboards.
4. Installation Notes
The sensor supports submerged installation and tank installation through a 3/4 NPT thread. Side wall and pipeline installation require suitable mounting accessories. The sensor should not be installed upside down or horizontally. For stable electrode performance, the installation angle should be at least 15° tilted. All cable joints should be waterproofed, especially for long term submerged, outdoor, or corrosive water environments.
5. Maintenance Guide
Before testing, remove the protective caps from the measuring electrode and reference electrode. Soak the electrode in clean water for about 2 hours to activate it, then rinse it with deionized water before use. If the sensor will not be used for more than two weeks, it should be stored dry and the sensing element should be covered with its protective cap.
Keep wiring terminals dry and clean. If contamination is found, wipe the terminal area with absolute alcohol and dry it before use. Avoid long term immersion in distilled water or protein solutions, and prevent contact with organic silicone grease. If the PVC membrane becomes translucent or covered with deposits after long use, rinse it with distilled or deionized water. If the sensor still cannot be calibrated or measured correctly after maintenance, the electrode should be replaced.
FAQ
Q
What is an online ammonia nitrogen sensor used for?
A
It is used for continuous ammonia nitrogen monitoring in wastewater, aquaculture, surface water, industrial discharge, tanks, and smart water quality systems.
Q
2. What measurement principle does this ammonia nitrogen sensor use?
A
It uses an ion selective electrode method based on a PVC membrane ammonium ion electrode.
Q
3. Can JW-IoT integrate this sensor into a smart water monitoring platform?
A
Yes. JW-IoT can integrate the sensor with RTUs, gateways, data loggers, cloud dashboards, alarms, and remote water quality monitoring systems.
Q
4. What output signals does the sensor support?
A
It supports RS485 Modbus RTU output and optional 4–20mA output for industrial automation and remote monitoring systems.
Q
5. Is this sensor suitable for aquaculture applications?
A
Yes. It can be used for ammonia nitrogen monitoring in fish ponds, shrimp ponds, recirculating aquaculture systems, and water treatment tanks.
Q
6. How should the ammonia nitrogen sensor be installed?
A
The sensor should not be installed upside down or horizontally. It should be installed at an angle of at least 15°, and side wall or pipeline installation should use a proper mounting accessory.
Q
7. Why choose JW-IoT for ammonia nitrogen monitoring projects?
A
JW-IoT can provide ammonia nitrogen sensors, telemetry devices, power supply, cloud platforms, alarm configuration, and complete water quality monitoring integration.
Q
8. Does the sensor need calibration?
A
The sensor is calibrated before delivery, but two point calibration can be performed when measurement error exceeds the acceptable range.
Q
9. Can JW-IoT support customized cable length and project integration?
A
Yes. JW-IoT can support customized cable length, Modbus communication integration, and complete smart water monitoring solutions.
+86 13520127780 
info@jingelway.com
