top of page

Exploring Ellenex's Conductivity and Salinity Sensor (CSD2): Precision in Environmental Monitoring

Diving Deeper into Ellenex's CSD2 - A Game-Changer in Water Quality Assessment and Monitoring.

Conductivity and Salinity Sensors in Water treatment Plant
Conductivity and Salinity Sensors in Water treatment Plant

Ellenex, a pioneering force in environmental monitoring technology, has introduced the Conductivity and Salinity Sensor(CSD2). This cutting-edge sensor offers an all-in-one solution for precise data collection and analysis. In this blog, we'll explore the technology behind Ellenex's CSD2, weighing its pros and cons, comparing it with other market options, delving into the world of wireless alternatives. We'll also touch on the diverse applications for conductivity and salinity measurements.\

Understanding the importance of Conductivity and Salinity sensors.

Monitoring conductivity and salinity of water is important for a variety of reasons, especially in the context of environmental science, water quality assessment, and various industrial processes. Here are some of the key reasons why monitoring conductivity and salinity is crucial:

  1. Water Quality Assessment: Conductivity and salinity are important indicators of water quality. High levels of conductivity and salinity can indicate the presence of contaminants, such as dissolved salts, heavy metals, or other pollutants. Monitoring these parameters helps identify changes in water quality and potential sources of contamination.

  2. Aquatic Ecosystem Health: Many aquatic organisms, including fish, plants, and microorganisms, are sensitive to changes in salinity. Monitoring these parameters in natural bodies of water, such as lakes, rivers, and oceans, helps ensure the health of aquatic ecosystems. Sudden changes in salinity can harm or even kill aquatic life.

  3. Agriculture: Salinity can be a significant concern in agriculture. High salinity levels in soil or irrigation water can reduce crop yields and damage plants. Monitoring water salinity is essential for managing irrigation practices and preventing soil salinization.

  4. Drinking Water and Wastewater Treatment: Municipal water treatment plants need to monitor water conductivity and salinity to ensure the water meets regulatory standards. High salinity levels can affect the taste and safety of drinking water, and monitoring helps in adjusting treatment processes accordingly.

  5. Industrial Processes: Various industrial processes require water with specific levels of conductivity and salinity. These processes include manufacturing, power generation, and desalination. Monitoring ensures that water quality meets the necessary specifications for these processes.

  6. Early Warning System: Monitoring conductivity and salinity can serve as an early warning system for certain environmental issues, such as saltwater intrusion, harmful algal blooms, or industrial spills. Detecting these changes early allows for prompt response and mitigation efforts.

Different measurement technology available in market for conductivity and salinity sensors.

These sensors come in different types and have various options available in the market. Here are some of the common options for conductivity sensors:

  1. Two-Electrode Sensors: These are the most basic and common type of conductivity sensors. They consist of two electrodes and are suitable for most general conductivity measurements.

  2. Four-Electrode Sensors: Four-electrode sensors are more accurate and suitable for a wider range of applications. They are less affected by electrode polarization and are often used in challenging environments.

  3. Contact Sensors: These sensors require direct contact with the solution being measured. They are the most common type and are suitable for a wide range of applications.

  4. Non-Contact Sensors: These sensors use electromagnetic or inductive methods to measure conductivity without direct contact with the solution. They are often used in applications where direct contact is not feasible or where cleanliness is crucial.

  5. Flow-Through Sensors: These sensors are designed for use in pipelines or flow cells. They allow continuous monitoring of conductivity in flowing liquids.

  6. Submersible Sensors: Submersible sensors are designed to be immersed in a liquid, making them suitable for applications like wastewater monitoring or environmental studies.

  7. Temperature Compensation: Many conductivity sensors come with built-in temperature sensors for automatic temperature compensation, which helps ensure accurate readings at different temperatures.

  8. Digital vs. Analog Sensors: Some conductivity sensors provide digital outputs for direct interface with data loggers or control systems, while others provide analog outputs.

CSD2-Conductivity and Salinity Sensor
CSD2-Conductivity and Salinity Sensor

Key features of the Ellenex's CSD2.

  1. Four-Electrode Technology: This sensor employs a four-electrode configuration with two graphite and two platinum electrodes, ensuring outstanding measurement accuracy while minimizing the impact of electrode polarization. The electrode works with a technology in 4 electrodes: an alternating current of constant-voltage is established between a primary’s pair of electrodes in graphite. The secondary’s electrodes in platinum allow of regulate the voltage imposed to primary’s electrodes to reflect of the fouling. The voltage measured between the primary’s electrodes is in function of the resistance of place and so, of the conductivity.

  2. Digital Sensor: Offering digital precision, this sensor consistently delivers accurate measurements and stable data, making it ideal for various applications.

  3. SDI-12 Interface: The SDI-12 interface facilitates seamless integration with data loggers and control systems, simplifying data acquisition and monitoring processes.

  4. In-Built Temperature Sensors: The in-built temperature sensors enable automatic temperature compensation, ensuring precise measurements even in fluctuating environmental conditions.

  5. Multiple Parameters:

  • Conductivity: Measures the ability of a solution to conduct electrical current, expressed in units such as Siemens per meter (S/m) or microsiemens per centimeter (µS/cm).

  • Salinity: Provides information about the concentration of dissolved salts in the solution, typically expressed as parts per thousand (ppt) or practical salinity units (PSU).

  • Temperature: Accurately measures temperature in degrees Celsius (°C) or Fahrenheit (°F).

  • Resistivity: Measures the resistance of the solution to the flow of electrical current, typically expressed in ohm-centimeters (Ω·cm) or ohm-meters (Ω·m).

6. Communication Techniques:

  • LoRaWAN: The sensor supports LoRaWAN (Long Range Wide Area Network) communication, which is ideal for long-range wireless data transmission, making it suitable for remote and outdoor applications. (

  • NBIoT (Narrowband IoT): NBIoT is another communication option, offering efficient and cost-effective connectivity for Internet of Things (IoT) applications. This enables data transmission in low-power, wide-area networks, enhancing the sensor's flexibility in IoT deployments. (

Applications of Ellenex's CSD2.

  1. Environmental Monitoring: Ellenex conductivity and salinity sensors can be used in environmental monitoring programs to assess water quality, track changes in ion concentration, and detect pollution in natural bodies of water.

  2. Aquaculture: Ellenex sensors are used in aquaculture to monitor and control the salinity of water in fish and shrimp farms, ensuring optimal conditions for aquatic organisms.

  3. Water Treatment and Desalination Plants: Ellenex sensors play a role in monitoring and controlling the salinity of water in desalination plants, helping to produce freshwater from seawater efficiently.

  4. Agriculture: Farmers can use Ellenex sensors to monitor and manage soil salinity and irrigation water quality, preventing soil salinity issues that could harm crops.

  5. Boiler Water Monitoring: Ellenex conductivity sensors are used to measure boiler feedwater purity, helping to prevent equipment damage and maintain operational efficiency in power plants and industrial facilities.

  6. Wastewater Treatment: Ellenex sensors are essential in wastewater treatment plants for monitoring and controlling effluent water quality, ensuring compliance with environmental regulations.

Conductivity and Salinity Monitoring in Remote Industrial Water Treatment Units
Conductivity and Salinity Monitoring in Remote Industrial Water Treatment Units


Ellenex's CSD2 Conductivity and Salinity Sensor with a built-in temperature sensor is a remarkable innovation in the field of environmental monitoring. Its advanced technology, accuracy, and durability make it an exceptional choice for various applications. When evaluating your options, consider your specific requirements, budget, and technical expertise. With several competitors and wireless solutions available, you can find the perfect fit for your monitoring needs. Whether you're a researcher, farmer, or industry professional, these sensors have the potential to revolutionize the way you monitor and manage water quality.


CSD2-L Datasheet:

CSD2-N Datasheet: Water Quality Monitoring in Remote Industrial Water Treatment Units Datasheet:

Fish and Oyster farm temperature and water salinity monitoring Datasheet:

River and Waterway pH, Dissolved Oxygen, Salinity, Conductivity and Turbidity Monitoring Datasheet:

bottom of page