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Trace Oxygen Measurements in Headspace

Needle-Type Oxygen Microsensor with Fixed Sensor Tip NFSG-PSt8

This oxygen sensor is specially designed for headspace measurement in packaging or other applications where gaseous oxygen measurements in small compartments have to be conducted. The tiny sensor tip is fixed inside a steel needle, so it does not protrude the needle tip. Secured inside the needle the sensor can be pierced through material and oxygen traces inside the headspace can be determined within seconds. The NFSG-PSt8 has a measurement range of 0 – 10 % oxygen, with a detection limit of 0.007 % O2.

  • High spatial resolution
  • High temporal resolution (t90 < 3 sec.)
  • No consumption of oxygen
  • Signal independent of flow velocity
  • Measurement in headspace or smallest volumes
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Technical

Specifications*Gaseous 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
Limit of detection0.007 % oxygen
Resolution

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

Accuracy at + 20 °C**± 0.007 % oxygen or ± 3 % rel.
Measurement temperature rangefrom 0 to + 50 °C
Response time (t90)< 3 sec. (gas)
Properties  
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)
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 stability60 months provided the sensor material is stored in the dark at room temperature

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