This Nitrate Sensor MNO3 is an ion-selective digital probe used for continuous online measurement of nitrate ion concentration in water. It adopts high-performance nitrate sensitive membrane core, directly measuring nitrate ion (MNO₃) concentration in aqueous solution, and supports conversion output of nitrate-nitrogen value.

Built-in Pt1000 automatic temperature compensation reduces measuring error caused by water temperature variation and improves data repeatability. Standard RS485 MODBUS-RTU digital output enables easy connection with PLC, controllers, data loggers and cloud monitoring platforms.

The sensor adopts IP68 fully-sealed corrosion-resistant housing, supports submerged and flow-cell installation. Regular calibration is required to guarantee long-term measuring accuracy.

It is widely applied in groundwater quality monitoring, surface water, municipal sewage, agricultural farmland drainage, industrial wastewater and environmental water-quality projects.

This Nitrate Sensor MNO3 is an industrial digital ion-selective electrode for online continuous monitoring of nitrate nitrogen in water. Adopts high-selectivity nitrate sensitive membrane, built-in automatic temperature compensation to minimize temperature-caused measuring drift.

Standard RS485 Modbus-RTU digital output, can be directly connected with PLC, water quality controller and IoT monitoring system. IP68 submersible waterproof grade, 3/4" NPT thread for immersion, pipeline and tank installation. Anti-interference design, suitable for surface water, sewage and agricultural water quality monitoring. Low maintenance for long-term on-site operation.

Key Advantages

- High-selectivity nitrate sensitive membrane, reduce interference of common anions

- Automatic temperature compensation, stable measurement under variable water temperature

- Digital RS485 Modbus-RTU, easy integration with industrial automation system

- Compact probe structure, convenient cleaning, calibration and electrode replacement

- IP68 submersible design, adapt to pool, pipeline and bypass installation

- Suitable for 24-hour continuous online monitoring

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(上盖);铝合金喷粉(下壳)
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, surface water environmental monitoring, agricultural irrigation water, farmland runoff, aquaculture, industrial nitrate-containing wastewater, underground water quality monitoring.