NH₄ · Ammonia Nitrogen Sensor

M200 Ammonia Nitrogen Digital Sensor

The membrane-covered ion-selective electrode (ISE) measures ammonium ion and ammonia nitrogen directly across a 0.1-18,000 ppm range, with +/-5%FS accuracy and automatic temperature compensation. IP68 protection, submersion or flow-through installation, and RS485 output make it a low-maintenance choice for continuous wastewater and aquaculture monitoring.

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Ammonia Nitrogen Sensor
18000 ppm
Max Range
0.1 ppm
Min Range
±5 %FS
Measurement Accuracy
IP68
Full protection · RS485
Features

Reagent-free ion-selective measurement for reliable, long-term ammonia nitrogen monitoring

The membrane-covered ISE measures directly without reagents or a peristaltic pump. Its wide range covers low-concentration aquaculture water through high-strength wastewater, with optional potassium-ion compensation.

Advanced Circuitry

High-impedance measurement circuit, high-precision acquisition of weak potential signals, anti-interference.

Easy Installation

Submersion and flow-through options with a standard 5 m cable for quick deployment.

Industrial-grade Protection

IP68 protection with PVC membrane electrodes and corrosion-resistant housing options for each application.

Fast Response

Fast ion-selective response with no reagents and minimal maintenance.

Model Selection

NH₄ Sensor Model Overview

The series supports multiple installation methods and water types. Filter by installation method, then add a model to your selection list or contact our engineers for verification.

M200-NH-01
RS485 Digital
Submersion · General Purpose
Range0.1–18000 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialPPS
WastewaterBiological TankMunicipal
M200-NH-02
RS485 Digital
Flow-through - Online Type
Range0.1–18000 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialABS
Effluent monitoringreclaimed waterCirculating Water
M200-NH-03
RS485 Digital
Submersion · AquacultureLowRange
Range0.1–100 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialPPS
AquaculturePondRiver Monitoring
M200-NH-04
RS485 Digital
Submersion - With Temp & K Compensation
Range0.1–18000 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialPOM+Stainless Steel
Aeration TankInfluentDenitrification Control
M200-NH-05
RS485 Digital
Flow-through - Surface Water Type
Range0.1–1000 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialABS
Surface WaterLandscape WaterRiver
M200-NH-06
RS485 Digital
Submersion - High Range
Range1–18000 ppm
Measurement PrincipleMembrane-covered ISE
pH Range4–10 pH
Housing MaterialPPS
High Ammonia Nitrogen WastewaterChemicalLandfill Leachate
Specifications

Complete Specifications

General specifications for the series. Range, housing, and output vary by model and are confirmed during selection.

Measured Parameter
Ammonia Nitrogen / Ammonium Ion(NH₄⁺)
Measuring Range
0.1–18000 ppm
Measurement Principle
Membrane-covered Ion Selective Electrode Method(ISE)
Suitable for pH Range
4–10 pH
Measurement Accuracy
±5%FS
Temp. Compensation
Automatic
Temp. Measurement range
0.0–50.0°C
Pressure Range
0–1 bar
Housing Material
PPS / ABS / POM+Stainless Steel(By Model)
Process Connection
G3/4 · NPT3/4 · M39×1.5
Cable Length
Standard 5m (Customizable)
Protection Rating
IP68
Power Supply
DC9–30V(recommended DC12V)
Electrical Connection
RS485(MODBUS-RTU)
Installation
Submersion / Flow-through
Warranty
1 year
Applications

Suitable Water Types

Ammonia nitrogen is a key indicator for wastewater denitrification and aquaculture safety. Reagent-free ISE monitoring supports precise process control and early warning. Choose the range and housing for your water type below.

Wastewater & Denitrification

5
Wastewater TreatmentBiological TankNitrification/DenitrificationEffluent monitoringDenitrification Control

Aquaculture

4
Pond aquacultureintensive aquacultureCirculating-water aquacultureEarly Warning

Industrial wastewater

4
ChemicalPharmaceuticalFoodLandfill Leachate

Environmental Monitoring

3
Surface WaterRiver MonitoringLandscape Water
Get a recommendation

Tell us your water type and range, and we will recommend the right ammonia nitrogen model

Send us the ammonia nitrogen range, water-body pH, and installation conditions. Our engineers will recommend the range, housing, compensation, and installation, then configure the probe for plug-and-play connection to an 8-channel monitor.

Contact an engineer