The Benefits Of Coulometric Sensors In Oxygen Transmission Rate Testing

Coulometric sensors determine the number of molecules transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced.

This method yields a linear output as predicted by Faraday’s Law. When oxygen enters the coulometric sensor, it reacts to release four free electrons. This is detected by the sensor as an electrical current, the magnitude of which is proportional to the amount of oxygen flowing into the sensor per unit time. Every oxygen molecule that enters the sensor is analyzed, allowing a measurement of the oxygen transmission rate (OTR) that is 95-98% efficient.