What is Conductivity (EC) Measurement?

Conductivity is the ability of a material to conduct electric current. The principle by which instruments measure conductivity is simple - two plates are placed in the sample, a potential is applied across the plates (normally a sine wave voltage), and the current is measured. Conductivity (G), the inverse of resistivity (R) is determined from the voltage and current values according to Ohm's law: G = I/R = I (amps) / E (volts).

Since the charge on ions in solution facilities the conductance of electrical current, the conductivity of a solution is proportional to its ion concentration. In some situations, however, conductivity may not correlate directly to concentration. The graphs below illustrate the relationship between conductivity and ion concentration for two common solutions. Notice that the graph is linear for sodium chloride solution, but not for highly concentrated sulphuric acid. Ionic interactions can alter the linear relationship between conductivity and concentration in some highly concentrated solutions.

For more information on Conductivity Measurement, please visit our technical area

How can Conductivity be Measured?

Conductivity can be measured in the laboratory using a bench

Conductivity Meter

, in outdoor and field applications a portable Conductivity Meter would be used and for plant and process applications an online pH controller would be used.

What products do R.M.S Ltd offer for Conductivity Measurement?

Portable Hand Held Instruments:

Our EcoScan compact palm-top Conductivity meters are economically priced, user-friendly and simple-to-use features such as : Microprocessor based, easy and quick push button calibration, auto ranging, automatic temperature compensation (ATC), easy to read custom LCD, hold function, auto power off and self diagnostic.

Please Click on the picture below to view in detail:

Portable Conductivity
Outdoor & Field Applications:
The new ECTestr™ range are the latest R.M.S Portable Waterproof Conductivity testers for use in water and wastewater treatment, electroplating, drinking water, hydroponics, aquaculture, aquariums, fish farms, swimming pools and spas. With new improved features like large screen LCD that displays more annunciators, ribbed design for firmer grip and anti-roll function.

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Pen testers
Waterproof Portable:

The CyberScan Conductivity Meters are an ideal choice for anyone requiring to take measurements in rugged outdoor field work or in situ Plant and Process applications - being waterproof and robustly built, the chance of accidental damage is virtually eliminated. Not only is this instrument waterproof but in the event of accidentally dropping it into liquid, it will float to facilitate easy retrieval.

Please Click on the picture below to view in detail:

Waterproof meters
Laboratory Applications:

Choose from our wide range of Bench Conductivity meters, from the low cost, high specification CyberScan CON510 through to our top of the range touch-screen CyberScan CON1500. Incorporating advanced programmable features to suit the demands of today's scientist these meters make laboratory Conductivity testing procedures routine with user-customisable options. The CyberScan CON1500 has expanded Memory and can store and recall up to 100 data sets.

Please Click on the picture below to view in detail:

Benchtop Conductivity
Plant & Process Applications:

Our Alpha CON2000 is our top of the range industrial Conductivity process control instrument. These controllers can be wall-mounted or panel-mounted, are equipped with advanced menu-driven incorporated with a myriad of user-customizable features. Features include built-in PI/proportional control, scaleable current output for fine control, 2 independent set-points, alarm with timer control and programmable wash cycle. Output is scaleable for fine control, there is also hysteresis protection and noise grounding functions, etc.

Please Click on the picture below to view in detail:

Replacement Sensors and Ancillaries:

At R.M.S Ltd we can supply replacement Conductivity Cells for both Industrial and Laboratory applications that are compatible with all modern instruments. All of our electrochemical sensors can be supplied with or with out temperature compensation. All we need is the make and model of your Conductivity meter so that we can determine the correct connector etc - please email, phone or fax us with your requirements and one of our team will contact you.

Please Click on the picture below to view in detail:

Conductivity Probes

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R.M.S Launch the all new BWB-1 Flame Photometer, simple & reliable measurements in Flame Photometry offering the user the capability to simultaneously detect Sodium (Na) - Potassium (K) - Lithium (Li) - Calcium (Ca) - Barium (Ba) and display of all 5 elements. Please click for more details of the Flame Photometer.

We accept all major credit/debit cards - please contact us for our best possible prices! Any questions? Why not try our Technical Area where you will find an in-depth explanation of many relevant aspects within the field of electrochemistry!

Russell Mainstream Supply Ltd.

Cameron House, 8 Crown Square, Kingskettle, Cupar, Fife, KY15 7PW

Phone: +44 (0)1337 831192

Fax: +44 (0)1337 371192

Email: Sales@rmprocesscontrol.co.uk

Instruments, Controllers & Sensors

Portable Turbidity meters
Bench Turbidity meters
Online Turbidity
Flame Photometry
BWB-1 Flame Photometer
Dissolved Oxygen (DO)
Handheld Dissolved Oxygen
Dissolved Oxygen Meters
Bench Dissolved Oxygen Meters
Industrial Dissolved Oxygen
Dissolved Oxygen Probes
DO Probe Conditioner
Portable pH Testers
Handheld pH Meters
Waterproof pH Meters Bench pH Meters
Industrial pH Controllers
Replacement pH Electrodes
Free Chlorine
Total Chlorine
Cyanuric Acid
Redox (ORP)
Portable Redox Testers
Handheld Redox Meters
Waterproof ORP Meters
Bench ORP Meters
Industrial ORP Controllers
Replacement Metal ORP Probes
Conductivity (EC)
Portable Conductivity Testers
Handheld Conductivity Meters
Waterproof Conductivity Meters
Bench Conductivity Meters
Industrial Conductivity Meters
Replacement Conductivity Cells
Total Dissolved Solids (TDS)
Portable TDS Testers
Handheld TDS Meters
Waterproof TDS Meters
Bench TDS Meters
Industrial TDS Controllers
Replacement Cells
Ion Concentration
Handheld Ion Meters
Waterproof Ion Meters
Bench Ion Meters
Ion Selective Electrodes (ISE)
Portable Salinity Testers
Handheld Salinity Meters
Bench Salinity Meters
Salinity Sensors
Multi-parameter Bench Meters
Please click above to view this range
Multifunctional Controller
Chlorine Dioxide
Paracetic Acid
Hydrogen Peroxide
Bench Resistivity Meters
Industrial Resistivity Controller
Resistivity Cells
Electrochemical Sensors
pH, Reference, Conductivity, Redox, Dissolved Oxygen, Ion Selective Electrodes, Calibration Solutions, Hollow Cathode Lamps and Deuterium Lamps
Process Control Instruments