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Enabling better global research outcomes in soil, plant & environmental monitoring.

SNiP-NTU for Nephelometric Turbidity

The SNiP-NTU is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time turbidity and temperature measurements for continuous water quality monitoring.


The base SNiP-NTU integrates 1x S-NODE and 1x AWQ- NTU Sensor to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x Sensors. The NTU Sensor is an optical sensor for the measurement of Nephelometric Turbidity.

  • IR optical sensor with optical fibre
  • Range: 0 to 4000 NTU or 0-4500 mg/L
  • Robust and waterproof (IP68)
  • Ultra low-power consumption
  • Digital output: Modbus RS-485 or SDI-12


  • Urban wastewater treatment (inlet/ outlet controls)
  • Sanitation network
  • Industrial effluent treatment
  • Surface water monitoring
  • Drinking water


See Further Specifications on the S-NODE
See Further Specifications on the AWQ-NTU Sensor


  • The measurement principle is based on IR nephelometry/850 nm. The sensor can be calibrated with a formazine standard solution.
  • The NTU sensor uses low-cost optical technology, requiring very little maintenance and no consumables.


The sensor can be connected to any types of transmitters, display units, controllers, or data loggers with Modbus RS-485 or SDI-12 inputs. The optical sensor saves its calibration data for better measurement management.


All data concerning calibration, history, users and measurements are processed within the NTU sensor and transmitted via RS-485 or SDI-12.


Compact, robust and light, the PVC sensor allows for handheld or fixed unit application.


The S-NODE (for Environmental Monitoring) has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source).

A decoder suitable for TTN will be provided based upon sensor configuration.

  • LoRaWAN™ low-power long-range connectivity
  • Supports the full range of SDI-12 commands, and sensors requiring constant excitation.
  • Optional CAT-M1
  • Solar rechargeable Lithium-ion or external 12V power options
  • Optional Multi-constellation GNSS
  • AS923, AU915 and US915 available, with other region plans available upon request.
  • Standard IP65 enclosure, optional IP67


AWQ-NTU Sensor

Measurement Principle: Diffusion IR at 90°
Measure range: 0 to 4000 NTU in 5 ranges:
• 0 – 50 NTU
• 0 – 200 NTU
• 0 – 1000 NTU
• 0 – 4000 NTU
OR 0 to 4500 mg/L
Calibration: Range 0-500 mg/L according to NF EN 872
Range >500 mg/L according to NF T 90 105 2
Resolution: 0.01 to 1 NTU – mg/L
Accuracy: < ±5%
Temperature Measurement: NTC Thermistor
Interface: Modbus RS-485 (standard); SDI-12 (optional)
Measurement Frequency: 1Hz
Power Requirement: 5 to 12 volts DC
Standby Current Draw: 40 μA
Average RS485 Draw (1 measurement/second): 820 μA
Average SDI12 Draw (1 measurement/second): 4.2 mA
Current Pulse: 500 mA
Operating Temperature: 0°C to +50°C
Storage Temperature: -10°C to +60°C
Dimensions: Diameter: 27 mm; length: 170 mm
Weight: 300g (sensor and 3 meter cable)
Construction: PVC, DELRIN, Quartz, PMMA, Polyamide
Maximum Pressure: 5 bar
Connection: 9 armoured connectors, polyurethane jacket, bare-wires or waterproof Fischer connector

NTU Wiring

Dimensions (mm)NTU Dimensions