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Electrical Conductivity

Electrical Conductivity Sensors

Greenspan manufacture several electrical conductivity sensors. All are made in our Melbourne facility.

With over 35 years of experience manufacturing water quality sensors we know what is required to make robust electrical conductivity sensors that are affordable and accurate.

Greenspan’s Australian made EC sensors are designed for very long-term deployment at unattended monitoring stations

The EC range are fully submersible and concurrently measures the fluid’s electrical conductivity and temperature to give salinity levels. 

The salinity sensors all offer full scale ranges from 500 to 75,000µS/cm, with or without temperature compensated output. Electrical Conductivity sensors with none standard ranges up to 200,000µS/cm are available.

For EC sensors with cables, you can choose custom lengths of sealed cable. Alternatively, you can fit some EC sensors with a waterproof socket with a matching cable plug. Contact Greenspan to discuss this option.

EC-2500 Electrical Conductivity Sensors
EC-2500 electrical conductivity sensors


Constructed from durable Acetal, our EC range have endured the harshest Australian environments for decades. For reliability, Greenspan EC sensors have no wetted metal components to corrode. This makes the sensor suitable for high conductivity (high dissolved solids) applications and even for water with high acidity.

For protection, the sensor head is fully epoxy encapsulated. A hole through the middle allows water to flow. It is here that the water provides magnetic coupling for the measurement to take place. Hardwired to the back of the sensor is an 8mm diameter submersible rated cable.

Once installed and powered, the sensor will measure conductivity from 0 to full scale, as inscribed on the sensor body in micro siemens per centimetre (µS/cm).

There are no moving parts on our electrical conductivity sensors and no serviceable components.

Electrical Conductivity Sensor Range

We advise you contact Greenspan so we can discuss your requirements, budget and environment to quote you the best option.


4-20 mA analogue output.
56mm diameter.

EC-1550 electrical conductivity sensors


SDI-12 output.
56mm diameter.

EC-1550 electrical conductivity sensors


4-20 mA analogue output.
47mm diameter.

EC-2500 salinity sensor


Integrated logger.
Internal battery power option is available. 47mm diameter.

EC-2500 salinity sensors


Digital SDI-12 output.
47mm diameter.

EC-2500 salinity sensor
EC-2500 salinity sensors

Analogue, serial or internal logging.

Greenspan’s range of electrical conductivity sensors are available with several output options.

EC-1500 & EC-2500A – Analogue output (4-20mA)
EC-1550 & EC2500D – SDI-12 output
EC-2500L – Internal logger (SDI-12 adaptor available)

Australian Made

Greenspan has made EC salinity sensors in Australia for over two decades. Our experience has allowed us to design sensors that reliably deliver accurate data in the harshest environments Australia has to offer.

With every Greenspan water quality sensor, you receive; local support from our experienced sales and service technicians, local repairs and recalibration from our Melbourne-based engineers, and access to local spares from our factory in Melbourne. No other brand of water quality sensor can offer such exceptional service.




eletrical conductivity sensors with internal logger and battery.

Integrated Battery Power

The EC-2500L logging salinity sensor is available with an integrated battery pack. Using non-rechargeable lithium batteries the EC-2500L can be discretely deployed for long durations without the need for solar panels of external batteries.

Bespoke Stainless Steel

We are able to make bespoke designs of many of our water quality sensors. For industrial water quality monitoring, we can make sensor bodies from stainless steel and add in a threaded flange which allows fitment in industrial process piping systems.



Measurement TechniqueToroidal measuring system
Standard EC ranges
0–5000µS/cm, 0–10000µS/cm, 0–20000µS/cm,
0–60000µS/cm & 0–70000µS/cm
Other ranges are available to order.
OutputsEC-2500L – RS-232
EC-2500A – EC: 4–20 mA, 0–2.5 V, or 0–1 V
Temperature: 4–20 mA, 0–2.5 V, or 0–1 V
LinearityTemperature 0.2%, EC0.2%
Temperature accuracy0.2ºC
EC accuracy, normalised to 25ºC1% FS @ 25ºC
EC Accuracy, non-normalised0.7% FS @25ºC
Cable typePolyurethane sheathed cable, OD8 mm, Aramid reinforced, moulded entry, bare wire connection
Standard cable lengths10, 20, 30, 50, 100, 150 m(32, 65, 100, 165, 325, 490 ft)
Non-standard cable lengthsYes (Extra cable moulding time may be required)
Power supply8–27 V
Reverse polarity protectedYes
Surge protectedto 2 kV
Warm-up/reading time1 sec
Current consumption40–90 mA (dependent on output)
Operating temperature0–50°C
Storage temperature–5°C–60°C
Depth rating100 m
Weight1.76 kg (Stainless Steel)
950 g (Acetal)
DimensionsLength 561.5 mm (22.11″ × 2.57″)
OD 47 mm(Stainless Steel or Acetal)
Wetted materials316 Stainless Steel, Acetal, Acrylic
Software suppliedECFA

EC-1550 & EC-1500

Measurement TechniqueToroidal measuring system
Standard EC ranges
0-500, 1000, 2000, 5000, 10000, 20000, 40000, 75000 μS/cm.
Temperature-compensated & uncompensated units are available.
Temperature0 to 50°C output
0 to 30°C compensation
AccuracyEC ±2% of full scale over 90-10% of range
Temperature ±0.2°C
OutputEC-1500 – Analogue 4-20mA current loop (3 wire current loop, 100Ω max).
EC-1550 – EC and Temperature: SDI-12 Digital Output;
4-20mA Output (3 wire current loops, 100Ω max)
1% FS @ 25ºC
Wetted MaterialsDelrin, epoxy plastic rated to IP68
Surge Protection EC-1500 – On power supply and 4-20mA signal lines
EC-1550 – On power supply and 4-20mA signal lines, SDI-12 lines
Power Supply9-30 volts unregulated
2mA sleep mode, <50mA plus loop current during reading
DimensionsDiameter 56mm
Response Time1 second to full accuracy after temperature equalisation

Contact us for prices and information.

Remember to include your phone number if you would like us to call you.