Conductivity probes for your measurement needs

Conductivity probes for your measurement needs

A wide range of conductivity cells are available for every application. These conductivity cells feature built-in temperature compensation; high, standard, and low conductivity measuring ranges; cell constants from 0.1 to 10cm -1 and a variety of probe materials including epoxy/graphite, glass/platinum, and stainless steel.

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 Rugged DuraProbe 4-electrode conductivity cell2-electrode conductivity cell for ultra-pure waterHigh range
2-electrode conductivity cell
Chemical resistant
3-electrode conductivity cell
 Orion DuraProbe 
4-Electrode Conductivity Cells
Orion 2-Electrode Conductivity CellsOrion 2-Electrode Conductivity CellsOrion 3-Electrode Conductivity Cell
  • Widest conductivity range
  • For lab and field applications
  • Rugged epoxy/ graphite body
  • Cable lengths from 1.5 to 10 meters
  • Low conductivity range
  • For ultra pure water applications
  • Includes detachable glass flow cell
  • High conductivity range
  • For lab applications
  • Chemical resistant glass body
  • Flow through or dip cell
    • Rugged epoxy/ stainless steel
    • Removable guard
    Product SKU number013005MD A

    013016MD A

    018020MD A *

    014005 H **

    Measurement range1μS/cm to 200mS/cm0.01μS/cm to 300μS/cm10μS/cm to 2000mS/cm0μS/cm to 200μS/cm
    Approximate Cell Constant0.475cm-10.1cm-110cm-11.0cm-1
    Cell MaterialEpoxy/graphiteSteel, V4AGlass/ platinum, platinizedEpoxy/steel
    ConnectorMiniDIN connector (Star)MiniDIN connector (Star)MiniDIN connector (Star)BNC and 2.5 mm Phono Jack connector (Russell)
    Meter CompatibilityStar SeriesStar SeriesStar SeriesRL060C Russell
    (D) Dia
    (L) Length
    (V) Flow cell volume
    15mm (D),
    120mm (L)

    13mm (D), 
    120mm (L),
    8-12mL (V)

    16mm (D),
    115mm (L)

    13mm (D),
    120mm (L)
    Min/Max Immersion Depth35/NAmm35/110mm55/110mm25/120mm
    Key information
     A MiniDIN connector (Star)   B 8 Pin DIN oonnector (A+ Series)
     F 8 Pin Waterproof DIN connector (A Series)
     H BNC and 2.5 mm Phono Jack oonnector (Russell)
     *Conductivity cell does not have temperature compensation
     **3 -Bectrode ConductMty Cell

      Increase your productivity with conductivity probe accessories

    Featured accessory


    Protective probe guard

    Provide additional protection and weight for conductivity cells and DO probes with Thermo Scientific Orion Protective Guards for Conductivity Cells and Dissolved Oxygen Probes. Use the all-stainless-steel guard when optimum protection and weight are required. Combine the stainless steel cap and plastic sleeve when weight is needed for submersion and standard protection is needed. Or, when minimal weight and protection are required, use the all-plastic guard.
    Increase your productivity with our conductivity probe accessories ›

    Thermo Scientific Orion conductivity cells


    Electrical conductivity is an inherent property of most materials and ranges from extremely conductive materials, such as metals, to non-conductive materials, like plastic or glass. In between the two extremes are aqueous solutions, such as sea water and plating baths. In metals, the electrical current is carried by electrons while in water it is carried by charged ions. In both cases, the conductivity is determined by the number of charge carriers, how fast they move, and the capacity of the carrier. Thus for most water solutions, the higher the ion concentration from dissolved salts, generally the higher the conductivity. Conductivity will increase with an increase in ion concentration until the solution becomes too crowded, thus restricting the freedom of the ions to move. Thereafter, conductivity may actually decrease with increasing ion concentration. This can result in two different concentrations of a salt having the same conductivity.

    Conductance is defined as the reciprocal of resistance and is measured in Siemens (S), which was formerly referred to as mho (ohm spelled backwards). Conductivity is an inherent property of any given solution and is derived from conductance by the geometry of the measuring cell. A measurement results in the conductance of the sample and it is converted to conductivity. This is done by determining the cell constant (K) for each setup using a known conductivity standard solution.

    Conductivity = (Cell conductance X Cell constant)

    The Cell is comprised of 2 flat parallel measuring electrodes separated a fixed distance (d). The Cell constant (K) is related to the physical characteristics of the measuring cell and is a function of the separation distance (d) divided by the electrode area (a). In practice, the measured cell constant is a fixed value and is entered into the meter whereby the conversion from conductance to conductivity is calculated and presented.


    Conductivity meters measure the ion capacity in aqueous solution to carry electrical current. As the ranges in aqueous solutions are usually small, the basic units of measurements are milliSiemens/cm (mS/cm) and microSiemens/cm (μS/cm). Conductivity is used widely to determine the level of impurities in water supplies for domestic consumption as well as industrial use. Industries that employ this method include the chemical, semi-conductor, power generation, hospitals, textile, iron and steel, food and beverage, mining, electroplating, pulp and paper, petroleum and marine industries. Specific applications include chemical streams, demineralizer output, reverse osmosis, stream boilers, condensate return, waste streams, boiler blowdown, cooling towers, desalinization, laboratory analysis, fruit peeling and salinity level detection in oceanography. In the table below are examples of solutions and their known conductivities.



    Absolute pure water 0.055μS/cm
    Power plant boiler water1.0μS/cm
    Good city water 50μS/cm
    Ocean water 53mS/cm
    Distilled water 0.5μS/cm
    Deionised water 0.1 - 10μS/cm
    Demineralised water 0 - 80μS/cm
    Drinking water 0.5 - 1mS/cm
    Wastewater 0.9 - 9mS/cm
    Seawater 53mS/cm
    10% NaOH 
    10% H2SO4 
    31% HNO3 
    * mS/cm = milliSiemen per centimeter
      uS/cm  = microSiemen per centimeter

    What are the benefits of 2-electrode cells and 4-electrode cells?

    2-Electrode Conductivity CellsDuraProbe 4-Electrode Conductivity Cells 

    The 2-electrode cells are able to measure low, standard, and high conductivity samples, depending on the cell constant. Cells with a 0.1cm-1 cell constant are ideal for low ionic strength solutions, deionized water, and ultra pure water. Glass/platinum cells are the best for chemically reactive conductivity samples, since the cell material is highly chemical resistant.

    DuraProbe 4-electrode cells provide the highest accuracy for demanding laboratory or field applications. The 4-electrode design compensates for electrode fouling, cable and connector resistance, polarization errors, and fringe field interference errors. The epoxy/graphite cell material is extremely durable and chemically resistant. DuraProbe conductivity cells are ideal for high and standard conductivity samples and difficult samples such as wastewater, runoff water, and mud.

    The stainless steel body 2-cell is perhaps our top sellerAll have durable epoxy bodies
    The stainless steel cell is best for ultra pure water measurementsNo error from cable resistance, allowing for longer cable lengths
    Multiple cell materials available - graphite, platinum or stainless steelMinimum effect on accuracy from electrode polarization and contamination
    Different cells designed to measure multiple specific rangesWide measurement range
    Option for flow cell or flow-through designUnaffected by deposits on cell surface
    Dry cell storage is an added benefit of these conductivity probes


    benchtop conductivity measurement

    The accuracy and reliability of your conductivity measurements depends on the instrumentation you use. Learn more about how you can identify the best match based on your required features, performance, specifications, and budget.

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    portable conductivity measurement

    Our portable meters are rugged and waterproof, and provide dependable performance in the field without sacrificing accuracy and reliability.


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    standards and solutions for conductivity measurement

    We offer conductivity standards, TDS standards, and conductivity probe conditioning solutions for your conductivity measurement needs. Find the standards and solutions that you need for your process.

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    Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

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