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Bare Fiber Oxygen Microsensor for High Resolution Trace Oxygen Measurements

Implantable Oxygen Microsensor IMP-PSt8

This tiny probe has a tip size of 230 µm while the outer diameter ranges from 230 µm to 900 µm. The microsensor tip is not mounted into any additional housing, so it can be applied in various customized applications. The bare glass fiber tip can be mounted to your own housings, steel tubes and micro respirometer chambers etc. The small outer diameter even allows insertion into implantable Venflon-tubes. Moreover the microsensor can be deployed in sealed containers to measure the oxygen content directly. The IMP-PSt8 has a measurement range of 0 – 10 % oxygen, with a limit of detection of 0.007 % O2.

  • High spatial resolution
  • High temporal resolution (t90 < 3 sec.)
  • Integration into customized housings or set-ups
  • No consumption of oxygen
  • Measurement in headspace & liquids

Technical

Specifications*Gaseous & Dissolved O2Dissolved O2
*data for microsensors TF = flat broken sensor tip with 230 μm diameter
**after two-point calibration as described in the manual
Measurement range0 – 10 % O2
0 – 100 hPa

0 – 4.5 mg/L

0 – 140 µmol/L
Limit of detection0.007 % oxygen3 ppb
Resolution

± 0.002 % O2 at 0.008 % O2
± 0.06 % O2 at 2.5 % O2

± 0.7 ppb at 3 ppb
± 2.5 ppb at 1000 ppb

Accuracy at + 20 °C**± 3 ppb or ± 3 % rel.
Measurement temperature rangefrom 0 to + 50 °C
Response time (t90)< 3 sec. (gas)< 10 sec. (liquid)
Properties
CompatibilityAqueous solutions, ethanol, methanol
No cross-sensitivity

pH 1 – 14
CO2, H2S, SO2
Ionic species

Cross-sensitivity

Organic solvents, such as acetone, toluene, chloroform or methylene chloride
Chlorine gas

Sterilization procedureEthylene oxide (EtO), recalibration recommended
Cleaning procedure

3 % H2O2
Ethanol
Soap solution

CalibrationTwo-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and a second calibration value optimally between 2 % and 4 % oxygen
Storage stability24 months provided the sensor material is stored in the dark at room temperature

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