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


Unisense MicroOptode

Unisense now offers optode sensor technology with full integration to our existing laboratory systems. The optical sensor technology gives you a cost-effective and robust oxygen sensor that can be applied a great number of applications. Simple two-point calibration and temperature compensation ensures ease-of-use, and the Unisense software suite allows you to combine the oxygen MicroOptode with our wide selection of microsensors (e.g. H2, H2S, N2O, NO, pH, redox and more). 
The oxygen optode is designed for research applications within: 
  • Respiration
  • Biomedical
  • Bulk and Bioreactors
  • Environmental sciences
  • Profiling

The MicroOptodes are used with our 1 ch Opto-F1 UniAmp, 4 ch Opto-F4 UniAmp or 2 ch Field MicroOptode Meter.

Oxygen optode principle: 

The measuring principle of the oxygen optode is based on in-house technology and delivers unparalleled performance within our core application segments. By quenching of the luminescence caused by collision with oxygen molecules, the oxygen concentration can be determined. More oxygen molecules will result in a lower emission signal, giving a measure of the oxygen concentration in the sample. Combined with our new Opto UniAmp systems the improved sensor technology gives you following advantages:
  • Zero-noise temperature compensation
    - Accurate oxygen quantification by unmatched temperature compensation
  • Ambient light filtering technology
     - Improved performance under fluctuating ambient light conditions, eg in situ
  • Bleach-protection
     - Novel multi-component modulation improves life-time with 50%
  • 50 µm tip
    - Optimized design for true microprofiling
  • Fast 430 µm Sensor
    - For EddyCovariance and other applications requiring <0.3s response times
  • Robust 3000µm sensor for bulk and long-time monitoring applications
  • E2PROM
    - Plug'N'Play with unique sensor identification and calibration retrieval
The optode fiber is build into a steel needle; this allows you to retract the fiber into the needle for complete protection e.g. when piercing a rubber septum. When the needle tip reaches the measuring site, the fiber can be pushed out into the sample and measure the oxygen concentration.
Customized versions with fixed exposure for e.g. profiling application and Eddy Covariance is also available.

 Ordering information 

MicroOptode Fiber diameter
Opto-50 50 µm for profiling, needle type: 0.6 x 25 mm
Opto-430 430 µm, needle type: 1.1 x 25 mm
Opto-430 Fast* 430 µm Fast (see note below), needle type: 1.1 x 25 mm
Opto-MR 430 µm (for MicroRespiration)
Opto-3000 3000 µm fiber with steel 5cm cap
Temp-UniAmp Temperature sensor
Opto-Field 50 µm or 430 µm for Field Opto UniAmp
Opto-Field 430 Fast 430 µm Fast for Eddy Covariance
Opto-Field 3000 3000 µm fiber with steel 5cm cap Field Opto UniAmp
Opto-Temp Field Temperature sensor for Field Opto UniAmp


*Opto-430 Fast: maximum sampling speed is 1 Hz on lab instruments and 10 Hz on Field Opto UniAmp. In EC-mode up to 16 Hz on Field Opto UniAmp.

View MicroOptode specifications

Technical information

View MicroOptode specifications

Related products

Opto UniAmp Systems
How can we help you?

How can we help you?

- Ask our experts
- Need trouble-shooting support
- Find a manual
- Get pricing and place an order
- And more...

Get Help Here