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Oxygen Measurements in Packaging Headspace

Needle-Type Oxygen Microsensor with Fixed Sensor Tip NFSG-PSt1

The tiny sensor tip of this oxygen microsensor is fixed inside a steel needle, so it does not protrude the needle tip. It is specially designed for packaging applications and measurements in the headspace. Fixed inside the needle the sensor can be pierced through the packaging material and the oxygen content in the headspace can be determined within seconds. The NFSG-PSt1 has a measurement range of 0 – 50 % oxygen, with a limit of detection of 0.05 % oxygen.

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

Specifications Gaseous O2
*after two-point calibration as described in the manual
**TS: tapered sensor tip with a diameter < 50 μm and no optical isolation
***TF: flat-broken sensor tip with a diameter of 140 μm
 
Measurement range

0 – 50 % O2
0 – 500 hPa

Limit of detection 0.05 % oxygen
Resolution

± 0.01 % O2 at 0.21 % O2
± 0.09 % O2 at 20.9 % O2
± 0.1 hPa at 2 hPa
± 1 hPa at 207 hPa

Accuracy* ± 0.4 % O2 at 20.9 % O2
± 0.05 % O2 at 0.2 % O2
 
Drift < 0.1 % O2 within 30 days (sampling interval of 1 min.)
Measurement temperature range from 0 to + 50 °C
Response time TS** (t90) < 1 sec.
Response time TF*** (t90) < 15 sec.
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 procedure

Ethylene oxide (EtO)

Cleaning procedure 3 % H2O2
Ethanol
Soap solution
Calibration Two-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and air-saturated environment
Storage stability 60 months provided the sensor material is stored in the dark at room temperature

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