Unisense - Oxygen (O2) Microsensor
With tip sizes of only 2-3 µm, you can measure oxygen at high spatial resolution without damaging your sample. You can choose a response time of less than 0.3 sec and attain fast and accurate oxygen measurements thanks to the insignificant oxygen consumption.
The O2 microsensors are all Clark-type sensors measuring oxygen partial pressures. 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 O2 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, such as the UniAmp Multi Channel.