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

SNiP-DOT for Dissolved Oxygen

The SNiP-DOT is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time Dissolved O2 & Temperature measurements for continuous water quality monitoring.


The base SNiP-DOT integrates 1x S-NODE and 1x AWQ-DO Optical Dissolved Oxygen Sensor to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x Sensors. The OPTOD Optical Dissolved Oxygen Sensor uses optical measurement by luminescence to measure dissolved O2 in water and water temperature.


See Further Specifications on the S-NODE
See Further Specifications on the AWQ-DO Optical Dissolved Oxygen Sensor

Further parameters can be added to SNiP-DOT, without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application.


The AWQ-DO (Optical Dissolved Oxygen technology) is based on luminescent optical technology. The AWQ-DO sensor is in compliance with the ASTM International Method D888-05. AWQ-DO does not require calibration, and thanks to an ultra low power technology, the AWQ-DO sensor meets the demands of field work, short and long term installation. Without oxygen consumption, this technology allows you to accurate measure in all situations, especially in very low oxygen concentrations.


The AWQ-DO sensor stores calibration and history data within the sensor. This allows for a plug and play system without the need for re-calibration.
Thanks to Modbus RS485 and SDI-12, the AWQ-DO can be connected to most commonly used devices (Datalogger, Controller, Automatation, Remote System…).


Compact, strong and light, the sensor can be used for portable measurement, or installed for fixed/permanent use.
Body in Stainless steel 316 L (passivation treated) or in Titanium for applications in corrosive environments.


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-DO Optical Dissolved Oxygen Sensor

Measurement Principle: Optical measurement by luminescence
Measurement Ranges: 0 to 20 mg/L
0 to 20 ppm
Resolution: 0.01
Accuracy: ± 0.1 mg/L
± 0.1 ppm
± 1%
Response Time: 90% of the value in less than 60 seconds
Recommended Measurement Frequency: >5 s
Water Movement: No movement necessary
Temperature Compensation: NTC Thermistor
Interface: Modbus RS-485 standard; SDI-12 optional
Storage Temperature: -10°C to +60°C
Sensor Power Supply: 5 to 12 volts
Current Draw: Standby 25 μA
Average RS485 (1 Hz): 4.4 mA
Average SDI12 (1 Hz): 7.3 mA
Current pulse: 100 mA
Dimensions: Diameter: 25 mm; length: 146 mm
Weight: Stainless steel version: 450g (sensor and 3m cable)
Titanium version: 300g (sensor and 3m cable)
Material: Stainless steel 316L or Titanium
Maximum Pressure: 5 bar
Connection: 9 armoured connectors, polyurethane jacket, bare wires or waterproof Fischer connector
Protection: IP68

Dimensions (mm)optod diagram

NTU Wiring