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

AWQ-NTU Sensor

The AWQ-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


Utilising the AWQ-NTU Sensor in a custom IoT (Internet of Things)

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

The base SNiP-NTU integrates 1x AWQ-NTU Sensor with 1x S-NODE to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x compatible sensors.


• The measurement principle is based on IR nephelometry/850 nm. The sensor can be calibrated with a formazine standard solution.
• The AWQ-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 AWQ-NTU sensor and transmitted via RS-485 or SDI-12.


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

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