Conductivity Probes, Accessories and Solutions | Thermo Fisher Scientific

Ensure consistent and accurate conductivity, resistivity, total dissolved solids (TDS) and salinity measurements with Orion conductivity probes. Thermo Scientific Orion DuraProbe 4-Electrode Cell Lab and Field applications provide the highest accuracy for demanding laboratory or field applications with durable and chemically resistant materials; ideal for high and standard conductivity samples and difficult samples such as wastewater, runoff water, and mud. Orion 2-Electrode Cell Probes can measure low, standard, and high conductivity samples, depending on the cell constant. Glass/platinum cells are the best for chemically reactive conductivity samples, since the cell material is highly chemical resistant.

Benefits of 2-electrode and 4-electrode conductivity probes

Orion 2-Electrode Cells	DuraProbe 4-Electrode Cells
Orion 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-Electrode 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

Featured conductivity probes

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	DuraProbe 4-Electrode Cells for Lab and Field	Orion 2-Electrode Cells Lab and Field	Orion 2-Electrode Cells, Ultra Pure

Applications	Widest conductivity range For lab and field applications Rugged epoxy/ graphite body Cable lengths from 1.5 to 10 meters	Ideal for field and lab application Measurements within a standard range Rugged epoxy/graphite body	Low conductivity range For ultra pure water applications Includes detachable glass flow cell
Measurement range	1 µS ‒ 200 mS/cm	10 µS ‒ 200 mS/cm	0.01 ‒ 300 µS/cm
Nominal constant (K)	0.475 cm^-1	1.0 cm^-1	1.0 cm^-1
Body and cell material	Epoxy body Graphite cell	Epoxy body Graphite cell	Stainless steel body V4A cell
Min/max immersion depth	35 mm min - no max
Meter compatibility	Star Series bench and portable meters

Selecting your conductivity probe

Compatible with Orion Star and Versa Star bench meters and Orion Star portable meters.

	Measurement range	Nominal constant	Cable length	Built-in temperature compensation	Rugged design	Materials
DuraProbe 1.5m*	1 µS ‒ 200 mS/cm	0.475 cm^-1	1.5 m	✓	✓	Epoxy body Graphite cell
DuraProbe 3m	1 µS ‒ 200 mS/cm	0.475 cm^-1	3 m	✓	✓	Epoxy body Graphite cell
DuraProbe 6m	1 µS ‒ 200 mS/cm	0.475 cm^-1	6 m	✓	✓	Epoxy body Graphite cell
DuraProbe 10m	0.1 µS ‒ 100 mS/cm	0.475 cm^-1	10 m	✓	✓	Epoxy body Graphite cell
DuraProbe 1.5m	10 µS ‒ 200 mS/cm	0.55 cm^-1	1.5 m	✓		Epoxy body Graphite cell
Orion 3-Electrode Cell**	0 μS/cm to 200 mS/cm			✓	✓	Epoxy body Stainless steel
Orion 2-Electrode Cell, Ultra Pure*	0.1 µS ‒ 100 mS/cm	0.1 cm^-1	1 m	✓		Glass body Platinum cell
Orion 2-Electrode Cell, Chemically Resistance	0.01 ‒ 300 µS/cm	0.1 cm^-1	1.5 m	✓		Stainless steel body V4A cell
Orion 2-Electrode Cell, Chemically Resistant*	1 µS ‒ 200 mS/cm	1.0 cm^-1	1 m	✓		Glass body with platinum cell
Orion 2-Electrode Cell Precise*	1 µS ‒ 20 mS/cm	1.0 cm^-1	1.5 m	✓		Epoxy body with platinum cell
Orion 2-Electrode Cell, Lab and Field	10 µS ‒ 200 mS/cm	1.0 cm^-1	3 m	✓	✓	Epoxy body with graphite cell
Orion 2-Electrode Cell, High Range	10 µS ‒ 2,000 mS/cm	10 cm^-1	1.5 m	✓		Glass body with platinum cell

*A variation of this model is available for compatibility with meters that require BNC connections.
**Uses a BNC connection. Requires on Orion Electrode Adapter Cable for use with Orion Star and Versa Star meters.

Accurately perform USP<645> conductivity methods

Being able to validate the water quality in purified water samples is critical in many industries. Conductivity testing can be a useful indicator in determining water quality and is more reliable and more convenient than wet chemistry tests. Three stages of conductivity testing are described by the United States Pharmacopeia (USP)—each more involved than the last. Being prepared with the right workflows and supplies may seem complicated, but with Thermo Scientific™ Orion™ products and support, you’ll have everything you need to master USP<645> in no time.

Discover the instruments and solutions that will prepare you for this regulation by reading the application note: Measuring the Conductivity of Pure Water Using USP <645>.

Conductivity Probe Accessories

Optimize your workflow and help ensure the best possible performance of your instruments with these conductivity probe accessories. Pictured to the left is the Orion Swing Arm Electrode Stand with the Orion Flow Cell and Nalgene Non-Phthalate PVC Tubing

Accessory	For use with	Description
Conductivity Conditioning Solution	Orion 2-Electrode Cell, Precise	Use to help maintain the probe bulb and keep it free of corrosion
Orion Resistor Kits	Versa Star Pro and Orion Star A conductivity meters with miniDIN connector	Verify the performance of your conductivity meters with the resistor kit.
Replacement Orion Flow Cell	Orion 2-Electrode Cell Ultra-Pure Probes for ultra-pure water (Cat. Nos. 013016A, 013016D, and 013016MD)	Flow cell ensures a continuous flow of liquid for monitoring conductivity.
Nalgene Non-Phthalate PVC Tubing	Orion Flow Cells	Use 1.5 to 3 meters, clear plastic flexible non-phthalate PVC tubing, suitable for food packaging (6.35 mm ID, 9.53 mm OD, 1.59 mm wall thickness).
Orion Protective Guards for Conductivity Cells and Dissolved Oxygen Probes	Conductivity and Dissolved Oxygen Probes (Cat. Nos. 013005MD, 013010MD, and 013025MD)	Add weight and/or protection to your probe for rugged environments and submersion.
Orion Swing Arm Electrode Stand	All Orion electrodes and probes.	Weighted base, swing arm and electrode holder that accepts up to four electrodes or probes, and a stirrer probe.
Orion Star A Series Electrode Holder for Electrode Stands	All Orion electrodes and probes	Holds up to six 15mm conductivity and DO probes.
Orion Lab Star Series Electrode Stand	All Orion electrodes and probes	Electrode stand with meter-attachable bracket

View all electrochemistry meter accessories ›

Conductivity Probe Solutions

Cleaning and storage of electrodes prolongs their life and helps ensure that each reading is as accurate as the last. Pouch and bottled packaging options are available so that you get the results you need in the field or in the lab.

Suitable for ultrapure water measurements, these low-level conductivity standards will help you meet your accuracy requirements. They hold their value due to our high-quality bottle material that is used, which mitigates losses and atmospheric contamination, while others can be affected. For USP <645> cell constant verification and other critical pure water applications, Orion Conductivity Standards are the ideal choice.

Solution	Formats
100 μS/cm conductivity/TDS standard	Five 60 mL bottles at a concentration of 47 ppm as NaCl, NIST traceable
147 μS/cm conductivity standard	Ten 15 mL pouches, NIST traceable
1413 μS/cm conductivity/TDS standard	Five 60 mL bottles or ten 15 mL pouches at a concentration of 692 ppm as NaCl, NIST traceable
12.9 mS/cm conductivity/TDS standard	Five 60 mL bottles or ten 15 mL pouches at a concentration of 7230 ppm as NaCl, NIST traceable
111.9 mS/cm conductivity standard	Five 60 mL bottles or ten 15 mL pouches at a concentration of 692 ppm as NaCl, NIST traceable
0.1 M KCl conductivity standard	One 475 mL bottle, NIST traceable
1413 µS/cm conductivity conditioning solution for the Orion 2-Electrode Cell Precise Probe	Five 60 mL bottles a concentration of 692 ppm as NaCl. Conditioning solution for use with the Orion 2-Electrode Cell Precise Probe (Cat. No. 011050MD), NIST traceable

NIST Traceability

All Orion pH buffers, ISE and conductivity standards are traceable to NIST standard reference materials and are labeled with a lot code and expiration date. The NIST materials used for each product are listed on its Certificate of Analysis, along with the method of analysis, lot-specific test data with test tolerances and expiration date (if applicable). For a searchable list of all Thermo Scientific Certificates of Analysis and Material Safety Data Sheets (MSDS), visit the Thermo Fisher Scientific Documents & Support page.

Conductivity Meters

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.

Conductivity Testers

Thermo Scientific pocket testers provide budget-friendly on-the-go temperature, conductivity and TDS testing.

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

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