Capacitive Water Vapour Sensors 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

Capacitive Water Vapour Sensors

Capacitive water vapour sensors measure relative humidity (RH) by observing changes in capacitance between conductive electrodes.

The sensor works like a plate capacitor with the bottom plate under a thin polymer hygroscopic dielectric. The plate above this allows water vapour to pass throughout polymer until it reaches equilibrium with the gas under measurement. The dielectric strength of the polymer is proportional to the water vapour content and this directly controls its capacitance. A simple temperature measurement allows the absolute humidity to be deduced.

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
© Versaperm Limited 2010