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

CTZN: Inductive Conductivity

CTZN Inductive Conductivity Sensor: 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


Utilising the CTZN Sensor in a custom IoT (Internet of Things)

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.

The base SNiP-SAL2 integrates 1x CTZN 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.


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.

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