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

AWQ-C4E Conductivity/Salinity

AWQ-C4E Conductivity/Salinity Sensor.

  • 4 electrodes (2 graphite, 2 platinum)
  • Range: 0 to 200 mS/cm
  • Digital sensor: Modbus RS-485, SDI-12
  • Robust and Watertight


  • Urban wastewater treatment
  • Industrial effluent treatment
  • Surface water monitoring
  • Sea water
  • Drinking water


Utilising the AWQ-C4E Sensor in a custom IoT (Internet of Things)

The SNiP-SAL is a ‘Sensor Node Integrated Package’ for LoRaWAN or CAT-M1 communication of real-time salinity, TDS, conductivity and temperature measurements for continuous water quality monitoring.

The base SNiP-SAL integrates 1x AWQ-C4E 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 AWQ-C4E sensor uses 4 electrode technology: an alternating current of constant voltage is established between the primary pair of graphite electrodes. The secondary platinum electrodes allow for voltage regulation of the primary electrodes to reflect fouling.
The voltage measured between the primary electrodes is a function of the resistance of the material, and thus, the conductivity.


The AWQ-C4E sensor stores calibration and history data within the sensor. This allows for a plug and play system without the need for re-calibration.
The AWQ-C4E can be connected to most Dataloggers, Controllers, Automation Systems and Alarms via Modbus RS485 or SDI-12.

Measurement Principle: Conductivity sensor with 4 electrodes (2 graphite, 2 platinum)
Measurement Range:
0-200 μS/cm
0–2000 μS/cm
0–20 mS/cm
0–200 mS/cm
Resolution: 0.01 to 1, depending on range
Accuracy: ±1% of the full range
Measurement Range:
5-60 g/Kg
Measurement Range:
0-133000 ppm
Response Time: < 5s
Temperature Compensation: NTC Thermistor
Sensor Interface: Modbus RS-485 (standard); SDI-12 (optional)
Measurement Frequency: 1Hz
Sensor Power Supply: 5 to 12 volts DC
Current Draw: Standby: 25 μA
Average RS485 (1 measurement/second): 6.3 mA
Average SDI-12 (1 measurement/second): 9.2 mA
Current pulse: 500 mA
Operating Temperature: 0°C to +50°C
Storage Temperature: -10°C to +60°C
Dimensions: Diameter: 27 mm; Length: 177 mm
Weight: 300g (sensor and 3 meter cable)
Material: PVC, DELRIN, stainless steel
Maximum Pressure: 5 bar
Connection: 9 armoured connectors, polyurethane jacket, bare-wires or waterproof Fischer connector
Protection: IP68

Dimensions (mm)

C4E Dimensions

NTU Wiring