Electrochemical Oxygen Sensors (Galvanic sensor) for permeability measurement

About Versaperm

Versaperm manufactures gas permeability testing equipment, offers a comprehensive permeability testing service and a materials consultancy. These are used to measure gas permeability and leakage, important in medical and pharmaceutical packaging, foils and films, coatings, food and confectionery packaging and contents, and many other applications.

Instruments

Versaperm designs and manufactures instruments to meet each customer’s needs. Instruments are typically be based on a modular MkVI design.

Testing Service

Our laboratory testing service has over 30 years experience to enable us to choose the best technique to measure your sample's permeability both quickly and accurately.

Applications

Permeability is often the most critial factor in a material or component's performance. It determines how drugs to loose potency, food goes off, how paper both prints and jams in equipment, how seals work and it can even cause electronics to fail.

Consultancy

Our Consultancy division combines our theoretical and practical Permeability skills in instrument design and manufacture. Permeability Consultancy

Electrochemical Oxygen Sensors (Galvanic sensor)

Ambient temperature electrochemical sensors, (often called galvanic sensors), are designed around a small cylinder which is sealed on one side using the sample under test.

The cylinder includes two electrodes immersed in potassium hydroxide, though other aqueous electrolytes can be used. As the oxygen diffuses through the sample it produces positively charge hydroxyl ions at the cathode. These hydroxyl ions migrate to the anode where they are re-oxidised, generating a current that is proportional to the oxygen concentration

Measuring this current produces results that can be accurate in the Parts Per Million (PPM) range.

Electrochemical Conductivity Sensor

Unfortunately, the lifetime of these sensors can be seriously reduced if they are applied to gases containing acids - such as hydrogen sulphide, sulphur dioxide or hydrogen chloride, unless the offending gas constituent is scrubbed prior to analysis. The sensors are also susceptible to over pressurization and a pressure regulator / control valve is recommended.

At Versaperm we are not tied to any specific sensor types or manufacturer and so we can always select exactly the right sensor for an application. Versaperm is a world technology leader in the measurement of gas permeability. We offer not only instruments but also comprehensive testing and consultancy services.

Versaperm Limited
10 Rawcliffe House, Howarth Road, Maidenhead, Berkshire, SL6 1AP, UK, Tel: +44 1628 777668
e.mail: webcontact@versaperm.com
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