Nutrients Analyzer
NH3-N Analyzer

SMR23 Series

Ammonium Analyzer

Ammonium Analyzer is connected directly via RS485 communication interface, providing simple, reliable, cost- saving process data with remote monitoring, calibration, configuration and diagnostics capabilities. The Ammonium Meter housing in a robust IP68 proof enclosure, 1500 N tensile strength Kevlar reinforced cable, up to 1.2 km digital data transmission, the NH4-N Analyzer is ideally used in water/wastewater industry.
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DM (6.8 MB)
  • All-in-One Compact Housing, Built-in Transmitter and Sensors
  • Robust IP68 Water Submersible Protection, Directly Installed in the Field, No Cabinet Required
  • Plug & Play, On- line Realtime Measurement
  • Ultra Low Power Consumption, Ideal for Outdoor Applications
  • 1500 N Tensible Strength Kevlar Reinforced Cable
  • Temperature and Chloride Compensation
  • Surge Protection for Power and RS485 Communication
  • RS485 Digital Communication, Minimize Cabling and Engineering Cost
  • Software Configuration, Calibration and Data Monitoring
  • Standard Modbus RTU Protocol, Direct Connected with PLC, HMI
  • Very Stable Electrodes, without the Need of Frequent Calibration
  • Metal Membrane of Electrode to Prevent Scratch
  • Electrode is over 12 Months Long Period of Life
  • Auto Cleaning wiper, Less Maintenance
  • Onboard Memory Allowing Users Easily Calibrate and Configure Sensor at Lab and Distribute to Various Fields Sites
  • AQCFG Software Tool for Data Monitoring, Calibration , Configuration and Diagnosis
  • IECEx/ATEX Ex ia IIB T5 Ga Explosive Proof Certification
Drinking water, water treatment, wastewater, fishery
Measurement Method
The ion selective electrode continuous measurement of nitrate is carried out with specific membrane that is selective of ammoniumion. That membrane creates charge seperation between the water surrounded electrode and internal filling solution. The charge is measured as a voltage that changes the concentration in the water adjacent the membrane. Compared with the traditional colorimetric method, there are many advantages such as fast response time, more accurate, easier and no reagents used.

Submersible, flow through, pipe insertion

SMR23 Ammonium (NH4-N ) Analyzer 
Output Signal Output Signal: RS485 (Modbus RTU protocol), 19,200 bps, 8 data bits, no parity, 1 stop bit; 4~20 mA
Data Resolution 16 bits (0.001% FS)
Surge Protection 4000 VDC
Power 5~12 V DC, 20 mA (SMR23-1); 300 mA (SMR23-2)
Protection Polarity, Overload, Short circuit
Safety CE, FCC
Type Ion selective electrode
Measurement range 0.1~100/1,000 mg/L, auto range
Accuracy ±5% measured value ±0.5 mg/L
Resolution 0.01 mg/L
Repeatability ±3% measured value ±0.5 mg/L
Operation pH pH 4~8.
Operating pressure Max. 0.2 Kgf/cm²
Operating Temperature 0 ~ 40 °C
Process Flow Rate 0.1~4 m/s
Response time 2 min (90%)
Protection IP68
Connection 1”-11 PT, 5-pin M16 plug
Housing POM
Dimension Φ 47 x 279 mm
Weight Nitrate analyzer: approx. 1.5 Kg ; cable: 80 g/m
Measurement range 0.1~1,000 mg/L
Accuracy ±5% measured valie ±0.5 mg/L
Resolution 0.01 mg/L
Repeatability ±3% measured valie ±0.5 mg/L
Sensor Pt1000
Measurement range 0~40 °C
Accuracy ±0.1 °C
Resolution 0.01 °C
Repeatability 0.1 °C