Aquas - Model SMR21 Series -Nitrate 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
• Surge Protection for Power and RS485 Communication
• RS485 Digital Communication, Minimize Cabling and Engineering Cost
• Standard Modbus RTU Protocol, Direct Connected with PLC, HMI
• Software Tool for Data Monitoring, Calibration , Configuration and Diagnosis
• Sapphire Glass Windows to Prevent Scratch
• Innovative Nano Coating to Remain Window Clean
• Auto Cleaning Wiper, Less Maintenance
• Onboard Memory Allowing Users Easily Calibrate and Configure Sensor at Lab and Distribute to Various Fields Sites
• Software Tool for Data Monitoring, Calibration , Configuration and Diagnosis

• Type: Optical
• Measurement range:
• SMR21-3: 0~10 mg/L (10 mm)
• SMR21-4: 0~20 mg/L (5 mm)
• SMR21-5: 0~50 mg/L (2 mm)
• SMR21-6: 0~100 mg/L (1 mm)
• Accuracy: ±5% in standard solution
• Resolution: 0.01 mg/L
• Repeatability: ±3% in standard solution
• Light Source: Xenon flash lamp
• Beam Angle: 180°
• Light Path Length: 1, 2, 5 mm
• Process flow rate: Max. 3 m/s
• Operating pressure: Max. 10 Kgf/cm2
• Operating Temperature: 0~50 °C
• Response time: 10 secs
• Protection: IP68
• Housing: SS316L
• Turbidity (or total suspended solids) measurement range:
• SMR21-3: 0~250 NTU ( or 0~500 mg/L)
• SMR21-4: 0~500 NTU ( or 0~1,000 mg/L)
• SMR21-5: 0~1,000 NTU ( or 0~2,000 mg/L)
• SMR21-6: 0~2,000 NTU ( or 0~5,000 mg/L)
• Turbidity (or total suspended solids) Accuracy: ±5% measured value
• Resolution: 0.01 mg/L
• Repeatability: ±3% in standard solution
• Dimension: Φ 75 x 416 mm
• Weight:
• approx. 5 Kg
• cable: 80 g/m

• Drinking water, water treatment, wastewater, fishery

• 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: 12 V DC ±10%, 0.5 A
• Protection: polarity, overload, short circuit
• Safety: CE, FCC

Typical Applications

• Drinking water, water treatment, wastewater, fishery

Measurement Method

• The Xenon flash lamp emits UV-Vis light passing through the sample to be analysed. The spectrometer resolve the wavelength into high resolution spectrum with advanced algorithms to provide the concentration and eliminates mutual interferences such as chemicals, turbidity and color.