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


The SNiP-SAL2 is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time salinity, conductivity and temperature measurements for continuous water quality monitoring.

Base SNiP-SAL2

The base SNiP-SAL2 integrates 1x S-NODE and 1x CTZN: Inductive Conductivity to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x Sensors.

The CTZN: Inductive Conductivity has been designed to measure Salinity, Conductivity and Temperature. The sensor is not sensitive to Fouling.

  • Temperature regulated sensor
  • Range 0 to 100 mS/cm
  • Modbus RS-485 and SDI12
  • Compact, robust and watertight


  • Conductivity compensated in temperature (mS/cm)
  • Conductivity non-compensated in temperature (mS/cm)
  • Salinity (g/Kg)
  • Temperature (°C)


  • Urban wastewater treatment
  • Industrial effluent treatment
  • Surface water monitoring
  • Sea water
  • Fish farming


See Further Specifications on the S-NODE
See Further Specifications on the CTZN: Inductive Conductivity Sensor


A ring-type coil is excited at fixed intervals and the response is measured by a second coil, which is linked to the excited coil. The connectivity between the coils (determined by the degree of conductivity) takes place via the conducting solution. The CTZN uses low-cost technology that requires little maintenance and no consumables.


The CTZN sensor stores calibration and history data within the sensor. This allows for a plug and play system without the need for re-calibration.
Modbus RS485 and SDI-12 allow the CTZN to connect to a range of dataloggers and monitoring systems.


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


CTZN: Inductive Conductivity

Measurement Principle: Inductive conductivity sensor, temperature regulated
Measurement Range:
0 to 100 ms/cm
Resolution: 0.1 ms/cm
Measurement Range:
5-60 g/Kg
Temperature Compensation: Inbuilt NTC or external measurement
Accuracy T°C: ± 0.1°C, range 0-40°C
Response Time: 90% of the value in less than 30 seconds
Signal Interface: Modbus RS-485 standard; SDI-12 optional
Measurement Interval: 1Hz
Sensor Power Supply: 5 to 30 volts max.
Current Draw: Automatic Standby: < 50 μA, Heating time 100 ms
Average Modbus RS485 – Range 0-100 ms/cm:
• 5V: 31 mA
• 12V: 15.5 mA
• 24V: 11.5 mA
Max. current pulse: 700 mA/2 ms, 350 mA/ 150ms
Operating Temperature: 0 to 50°C
Storage Temperature: -10°C to +60°C
Dimensions: Diameter: 62.4mm, Length: 196mm
Weight: 700g
Material: EPDM, PVC, Stainless steel
Maximum Pressure: 5 bar
Connection: 9 armoured connectors, polyurethane jacket, bare-wires or waterproof Fischer connector
Protection: IP68

Dimensions (mm)

CTZN Dimensions

NTU Wiring