This ammonia nitrogen sensor adopts the ion selective electrode (ISE) method, also called electrode method for ammonia nitrogen measurement. It is equipped with high-selectivity ammonium sensitive membrane, which selectively identifies ammonium ions in water to calculate ammonia nitrogen concentration. Built-in automatic temperature compensation effectively eliminates temperature interference and ensures stable test results.

Digital integrated design with standard RS485 Modbus-RTU communication, compatible with ammonia nitrogen monitor, PLC and remote IoT system. IP68 fully submersible structure with 3/4" NPT thread for pipeline, tank and reaction tank installation. Wide measuring range 0.1~3000mg/L optional, no chemical reagents required, low running cost for long-term online monitoring.

This Ammonia nitrogen by electrode method sensor adopts ion selective electrode testing principle to realize rapid continuous detection of ammonia nitrogen (NH3-N) in water. Compared with colorimetric reagent method, this electrode method features no reagent consumption, fast response speed and low long-term operation cost.

The core is a high-stability ammonia sensitive membrane electrode. Built-in Pt1000 temperature compensation module automatically offsets measurement errors caused by water temperature changes. It outputs standard RS485 MODBUS-RTU digital signal, which can be matched with ammonia nitrogen controllers, PLC, data acquisition terminals and industrial cloud monitoring platforms.

The whole sensor adopts fully sealed anti-corrosion housing with IP68 waterproof rating, supporting submerged and flow-cell installation. Only regular simple calibration is needed for daily maintenance.

It is widely used in municipal sewage plants, livestock breeding wastewater, river and lake surface water monitoring, chemical wastewater and environmental automatic water quality monitoring stations.

Key Advantages

Electrode method detection, no reagent dosing, low operating cost
High selectivity ammonium sensitive membrane, less ion cross-interference
Wide range coverage for surface water, breeding wastewater, chemical sewage
Digital RS485 output, easy access to industrial automatic control system
Submersible industrial probe, convenient disassembly, cleaning and calibration
24-hour continuous online monitoring, suitable for sewage treatment station

Sensor Technical Specifications

Measurement Range	NH4N：0.1~ 3000 mg/L K+：0.5~5000 mg/L (optional) PH：5-10 Temperature：0-40℃
Resolution	NH4N：0.01 mg/L K+：0.01 mg/L(optional) Temperature：0.1℃ pH：0.01
Accuracy	NH4N： NH4-N: ±5% of reading or ±0.2 mg/L, whichever is greater K+: ±10% of reading or ±0.2 mg/L (optional) Temperature：±0.5℃ pH：±0.1 pH
Repeatability	±5% or 0.2 mg/L, whichever is greater
Communication Protocol	MODBUS RS485
Storage Temperature	0 to 50°C (non-freezing)
Operating Temperature	0 to 40°C (non-freezing)
Dimensions	55mm×342mm(diameter × length)
Weight	<1KG
Protection Rating	IP68/NEMA6P
Cable Length	Standard 10 m cable, extendable up to 100 m

Controller Technical Specifications:

Display Output	128×64 graphic dot-matrix LCD with LED backlight for sunlight-readable operation
Power Supply	AC: 85–500 VAC; DC: 9–36 VDC
Main Material	PA66+GF25+FR(Top cover);Aluminum Alloy Powder Coating (Bottom Shell)
Output	Three channels of 4-20mA
Relay	Three relays, programmable for response parameters and values
Digital Communication	MODBUS RS485 for real-time data transmission
Storage Temperature	-20 or 70℃
Operating Temperature	-15 or 60℃
Waterproof Ratin	IP66/NEMA4X
Dimensions	145mm125mm162mm (L × W × H)
Weight	1.35KG

Application

Municipal sewage treatment plant, livestock breeding wastewater, printing & dyeing wastewater, landfill leachate, chemical plant wastewater, river environmental monitoring, aquaculture water.