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Bare Fiber Oxygen Microsensor for Customized Measurement Set-Ups

Implantable Oxygen Microsensor IMP-PSt7

This optical oxygen microsensor can be applied in various customized applications. The tiny probe has a tip size < 50 µm to 230 µm while the outer diameter ranges from 230 µm to 900 µm. The microsensor tip is not mounted into any additional housing. 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-PSt7 has a measurement range of 0 – 100 % oxygen, with a limit of detection of 0.03 % O2.

  • High spatial resolution (< 50 μm)
  • High temporal resolution (t90 < 3 sec.)
  • Integration into customized housings and set-ups
  • No consumption of oxygen
  • Measurement in headspace & liquids

Technical

Specifications*Gaseous & Dissolved O2Dissolved O2
*data for microsensor TF = flat-broken sensor tip with 230 μm diameter
**after two-point calibration as described in the manual
Measurement range0 – 100 % O2
0 – 1000 hPa

0 – 45 mg/L

0 – 1400 µmol/L
Limit of detection0.03 % oxygen15 ppb
Resolution

± 0.01 % O2 at 1  % O2
± 0.05 % O2 at 20.9 % O2

± 0.005 mg/L at 0.4 mg/L

± 0.025 mg/L at 9.06 mg/L
Accuracy at + 20 °C**± 0.05 % O2 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 procedure

Steam sterilization
Ethylene oxide (EtO)
Recalibration recommended

Cleaning procedure

3 % H2O2
Ethanol
Soap solution

CalibrationTwo-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and air-saturated environment
Storage stability24 months provided the sensor material is stored in the dark at room temperature

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