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

SNiP-SAL for Salinity

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


The base SNiP-SAL integrates 1x S-NODE and 1x AWQ-C4E Conductivity/Salinity Sensor to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x Sensors. The AWQ-C4E sensor has been designed to measure Salinity, TDS, Conductivity and Temperature.

  • 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


See Further Specifications on the S-NODE
See Further Specifications on the AWQ-C4E Conductivity/Salinity Sensor


The 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 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 C4E can be connected to most Dataloggers, Controllers, Automation Systems and Alarms via Modbus RS485 or SDI-12.


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


C4E Sensor

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