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Robust Probe for Online Oxygen Monitoring

Oxygen Dipping Probe DP-PSt3

The oxygen dipping probe type PSt3 for measurement in normal oxygen range consists of a polymer optical fiber where one end is coated with an oxygen-sensitive foil. The end of the fiber is covered in a high grade steel tube to protect both the sensor material and the fiber. The steel tube has an outer diameter of 4 mm and a length of 10 cm. Other lengths are available on request. Due to the use of a polymer optical fiber this probe is compatible to temperatures up to + 70 °C.

  • Excellent long-term stability
  • Pressure resistant (max. 5 bar)
  • Polarization-free
  • No membrane cleaning and replacement necessary
  • No electrolyte solution to replenish
  • Long shelf life

Applications

Long-term Measurements in Soil

PreSens offers dipping probes for oxygen measurement that does not consume oxygen. Due to their small dimensions they do not disturb the flow and mass-transport and consequently display the in-situ oxygen concentration. As minisensors from PreSens are long-term stable they can be implanted in soil for many years! With this new method the process of soil aeration, which is very critical for plant productivity, can be investigated.

Dr. Heidi Heuberger, Technical University of Munich, Munich, Germany


Environmental Research: Investigation in Soil Filters

Due to the small outer dimension and mechanical robustness the oxygen dipping probe offers the possibility to measure the oxygen content in-situ in columns filled with filter sands during the flow of sewage (see picture on the left). The results show that a lack of oxygen stops the nitrification process.


Technical

SpecificationsGaseous & Dissolved O2Dissolved O2
*after two-point calibration as described in the manual
Measurement range

0 – 100 % O2

0 – 1000 hPa

0 – 45 mg/L

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

± 0.01 % O2 at 0.21 % O2
± 0.1 % O2 at 20.9 % O2
±0.1 hPa at 2 hPa

± 1 hPa at 207 hPa

± 0.004 mg/L at 0.091 mg/L
± 0.04 mg/L at 9.1 mg/L
± 0.14 µmol/L at 2.83 µmol/L

± 1.4 µmol/L at 283.1 µmol/L
Accuracy*± 0.4 % O2 at 20.9 % O2
± 0.05 % O2 at 0.2 % O2
Drift< 0.03 % O2 within 30 days (sampling interval of 1 min. / at 0% oxygen)
Measurement temperature rangefrom 0 to + 50 °C
Response time (t90)< 6 sec.< 40 sec.
Properties
CompatibilityAqueous solutions, ethanol, methanol
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 procedureEthylene oxide (EtO)
Gamma irradiation
Cleaning procedure3 % H2O2
Acidic agents (HCl, H2SO4), max. 4 – 5 %
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

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