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

AWQ-DO: Optical Dissolved Oxygen

AWQ-DO: Optical Dissolved Oxygen Sensor

• Optical Technology -no need for calibration
• Digital output (Modbus RS-485, SDI-12)
• No drift, Reduced maintenance
• Body in Stainless steel (316 L) or Titanium

• Urban wastewater treatment
• Industrial effluent treatment
• Surface water monitoring,
• Sea water monitoring, fish farming, aquarium
• Drinking water


The AWQ-DO is available in a preconfigured IoT (Internet of Things) setup for real-time dissolved O2 and temperature measurements for continuous water quality monitoring.


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.

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