Oxygen Microsensor
Filling quality and long-term storage stability of packages determined with an oxygenmicrosensor.
Our needle-type oxygen microsensors - with sensor tips smaller 50 µm - enable micro-invasive measurements. Therefore, these simple tools are most commonly applied to determine headspace and dissolved oxygen content in packages. The septum of the package can be pierced with the syringe needle of the sensor housing, and then the sensor is pushed out for measurement. With this method measurements to ensure filling quality and long-term storage stability of your products are taken inside the package with an oxygen microsensor and no time consuming sampling is necessary.
Another common application is the oxygen content measurement in pharmaceutical vials. Like with other packages, the septum of the vial is pierced with the needle of the oxygen microsensor housing. Place the tip of the needle in the headspace of the vial and extend the sensor tip to take measurements. After measurement values stabilize at a certain oxygen value, you can insert the sensor further into the liquid and again wait till values stabilize.
This way the oxygen content of the sample and the headspace of the vial can be determined in one measurement in a minimum expenditure of time. The graph shows an example for measurement data obtained with a needle-type oxygen microsensor in a pharmaceutical vial.
The oxygen microsensor can also be used for oxygen content measurement in blisters. Septa are attached to the blister to avoid oxygen from the air entering the blister. The needle of the microsensor housing is pierced through this sealing into the blister. The tip of the needle is placed in the space between the packaging and the tablet or capsule. Then the sensor tip is expanded and the oxygen content inside the blister can be determined. This is an easy method to ensure the shelf life of pharmaceuticals and other products packed in blisters.
