Aquas - Model SMR23 Series -Ammonium Analyzer

• All-in-One Compact Housing, Built-in Transmitter and Sensors
• Robust IP68 Water Submersible Protection
• Plug & Play, On- line Realtime Measurement
• Ultra Low Power Consumption, Ideal for Outdoor Applications
• 1500 N Tensile Strength Kevlar Reinforced Cable
• Temperature and Potassium Compensation
• Surge Protection for Power and RS485 Communication
• RS485 Digital Communication, Minimize Cabling and Engineering Cost
• Standard Modbus RTU Protocol, Direct Connected with PLC, HMI
• Long Term 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 Site
• Software Tool for Data Monitoring, Calibration , Configuration and Diagnosis

• Type: Ion selective electrode
• Measurement range: 0~2000 mg/L
• Accuracy: ±5% of reading ±0.5 mg/L
• Resolution: 0.01 mg/L
• Repeatability: ±3% of reading ±0.5 mg/L
• Operation pH: pH 4~8.5
• Operating pressure: Max. 0.2 Kgf/cm2
• Operating Temperature: 0 ~ 40 °C
• Process Flow Rate: 0.1~10 m/s
• Response time: 2 min (90%)
• Protection: IP68
• Temperature: IP68
• Sensor: NTC 10K
• Temperature measurement range: 0~40 °C
• Temperature accuracy: ±0.5 °C
• Resolution: 0.01 mg/L
• Repeatability: ±3% of reading ±0.5 mg/L
• Potassium:
• Measurement range: 0~1,000 mg/L
• Accuracy: ±5% measured value ±0.5 mg/L
• Resolution: 0.01 mg/L
• Repeatability: ±3% measured value ±0.5 mg/L
• Process connection: M26 x 1.5
• Housing: POM
• Dimension: Φ47x279 mm
• Weight:
• Ammonium analyzer: approx. 1.5 Kg
• Ammonium and potassium analyzer: approx. 1.8 Kg
• cable: 80 g/m

• Output Signal: RS485 (Modbus RTU protocol), 19,200 bps,8 data bits, no parity, 1 stop bit; 4~20 mA (optional)
• Data Resolution: 16 bits (0.001% FS)
• Surge Protection: 4000 V DC
• Power: 3.6~12 V DC ±10%, 20 mA(SMR23-1); 60 mA(SMR23-2)
• Protection: polarity, overload, short circuit
• Safety: CE, FCC

Typical Applications

• 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.