You are here: Products bread Sensors and Electrodes bread O2 Microsensor

O2 Microsensor

Oxygen microsensor with tip diameter of 10 µm.
Oxygen MicroRespiration sensor. The specially designed alu-case easily guides the oxygen sensor into the MicroRespiration Chamber...
The oxygen microsensor can be mounted with a steel needle to make the glass sensors strong in the longitudinal axis.
OX-NP - Oxygen needle sensor for piercing.
Tip of oxygen needle sensor for piercing.
Dimensions of a 500 µm and 5 µm oxygen microsensor tip, respectively. The inner dimensions of the two sensors are similar, howev...
The graph shows the signal from an oxygen microsensor plotted against the oxygen partial pressure around the sensor tip.
The oxygen microsensor signal must be amplified on a Unisense amplifer e.g. the OXY-Meter.
The oxygen microsensor signal must be amplified by a Unisense amplifier e.g. the laboratory Microsensor Multimeter.
prev next

High performance microsensor

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 can be less than 0,3 sec and the oxygen microsensor has an insignificant oxygen consumption giving you fast and accurate oxygen measurements.

The oxygen microsensor is designed for research applications within:

  • Environmental sciences
  • Biomedical sciences
  • Biotechnology
  • Microbiology

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.

 Ordering information 

Standard glass sensor Outside tip diameter
OX-10 8-12 µm
OX-25 20-30 µm
OX-50 40-60 µm
OX-100 90-110 µm
OX-200 175-225 µm
OX-500 400-600 µm
OX-MR 400-600 µm
OX-N 1,1 x 40 mm - needle sensor
OX-NP 1,6 x 40 mm - needle sensor for piercing
OX-Eddy 40-60 µm - Fast responding and low stirring sensitive sensor

Find complete oxygen microsensor specifications below and possible microsensor customizations and adaptations under Related Products found to the right.

View Oxygen Sensor Specifications

Technical information

View sensor specifications

Related products

Sensor Customization
Test Test of oxygen sensors

Test of oxygen sensors

Demonstration of a quick and easy test of your new oxygen microsensor. 

Read more
Profiles in salty crusts

Profiles in salty crusts

Unisense microsensors were succesfully applied to measure salty crusts in the Red Sea in Israel. 

Read more

Revsbech,N.P. (1989), An oxygen microsensor with a guard cathode, Limnol Oceanography, 474 - 478, vol. 34 Read abstract

Lackner,S. et al (2010), Nitritation Performance in Membrane Aerated Biofilm Reactors differs fromconventional 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 Read abstract

See all publications