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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

Technical

SpecificationsGaseous 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 detection0.05 % 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 rangefrom 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-sensitivityOrganic solvents, such as acetone, toluene, chloroform or methylene chloride
Chlorine gas
Sterilization procedure

Ethylene oxide (EtO)

Cleaning procedure3 % H2O2
Ethanol
Soap solution
CalibrationTwo-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and air-saturated environment
Storage stability60 months provided the sensor material is stored in the dark at room temperature

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