Conductivity probes for your measurement needs
|Rugged DuraProbe 4-electrode conductivity cell||2-electrode conductivity cell for ultra-pure water||High range|
2-electrode conductivity cell
3-electrode conductivity cell
|Orion DuraProbe |
4-Electrode Conductivity Cells
|Orion 2-Electrode Conductivity Cells||Orion 2-Electrode Conductivity Cells||Orion 3-Electrode Conductivity Cell|
|Product SKU number||013005MD A|
|Measurement range||1μS/cm to 200mS/cm||0.01μS/cm to 300μS/cm||10μS/cm to 2000mS/cm||0μS/cm to 200μS/cm|
|Approximate Cell Constant||0.475cm-1||0.1cm-1||10cm-1||1.0cm-1|
|Cell Material||Epoxy/graphite||Steel, V4A||Glass/ platinum, platinized||Epoxy/steel|
|Connector||MiniDIN connector (Star)||MiniDIN connector (Star)||MiniDIN connector (Star)||BNC and 2.5 mm Phono Jack connector (Russell)|
|Meter Compatibility||Star Series||Star Series||Star Series||RL060C Russell|
(V) Flow cell volume
|Min/Max Immersion Depth||35/NAmm||35/110mm||55/110mm||25/120mm|
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|
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 water||1.0μS/cm|
|Good city water||50μS/cm|
|Deionised water||0.1 - 10μS/cm|
|Demineralised water||0 - 80μS/cm|
|Drinking water||0.5 - 1mS/cm|
|Wastewater||0.9 - 9mS/cm|
|* 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 Cells||DuraProbe 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 seller||All have durable epoxy bodies|
|The stainless steel cell is best for ultra pure water measurements||No error from cable resistance, allowing for longer cable lengths|
|Multiple cell materials available - graphite, platinum or stainless steel||Minimum effect on accuracy from electrode polarization and contamination|
|Different cells designed to measure multiple specific ranges||Wide measurement range|
|Option for flow cell or flow-through design||Unaffected by deposits on cell surface|
|Dry cell storage is an added benefit of these conductivity probes|
Measuring the Conductivity of Pure Water Using
This application note describes the three stages of USP<645> water conductivity testing. Includes sections on cell constraint calibration, meter calibration verification, and helpful measuring hints.
What are the top mistakes when measuring conductivity in liquids?
Although conductivity measurements are generally simple and easy to take, mistakes can still affect the validity of the data generated. Download this informative Smart Note to learn more.
Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.
Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.