The Unisense oxygen microsensor is an excellent research tool for high quality oxygen measurements. The microsensor can be made with tip sizes of only 2-3 µm allowing for non-destructive measurements of oxygen at high spatial resolution in numerous applications. The response time ca be less than 0,3 sec and the oxygen microsensor has an insignificant oxygen consumption giving you fast and accurate oxygen measurements.
- Environmental sciences
- Biomedical sciences
oxygen microsensor principle
The oxygen micro- and minisensors are all Clark-type sensors measuring oxygen partial pressure. The working principle of the oxygen microsensor is based on diffusion of oxygen through a silicone membrane to an oxygen reducing cathode. The reducing cathode is polarized against an internal Ag/AgCl anode.
The oxygen microsensor has a guard cathode that removes oxygen in the electrolyte, thus minimizing zero-current and pre-polarization time. The resulting sensor signal is in the pA range and is measured by a high quality picoammeter e.g. the Unisense Microsensor Multimeter.
part numbers and outside tip diameter
- OX-10: 8-12 µm
- OX-25: 20-30 µm
- OX-50: 40-60 µm
- OX-100: 90-110 µm
- OX-500: 400-600 µm
- OX-MR: 400-600 µm
- OX-N: 1.1 mm
- OX-NP: 1.6 x 40 mm – needle sensor for piercing
- OX-Eddy: 90-110 µm – Fast sensor
- Photosynthetic biofilms
- Biogeochemistry and ecosystem functioning
- In-vitro cell culture profiling
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Revsbech,N.P. (1989), An oxygen microsensor with a guard cathode, Limnol Oceanography, 474 – 478, vol. 34
Lackner,S. et al (2010), Nitritation Performance in Membrane Aerated Biofilm Reactors differs from conventional Biofilm Systems, Water Research, – , vol.
Lecoq,J. et al (2009), Odor-Evoked Oxygen Consumption by Action Potential and Synaptic Transmission in the Olfactory Bulb, Journal of Neuroscience, 1424 – 1433, vol. 29