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Robust Steel Probe for Monitoring Oxygen Traces

Oxygen Dipping Probe DP-PSt8

This oxygen probe is used for trace oxygen monitoring in liquids or gasses. It has a stainless steel fitting that covers the end of a polymer optical fiber with an oxygen-sensitive foil attached to it. Protected by this steel housing and with its small outer diameter of 3 mm the sensor can be integrated in liquids and semi-solid samples, such as e. g. sediments or filter sand, without causing disturbance. The probe has a length of 10 cm, but other lengths are also available on request.

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

In-line Oxygen Measurement in Brewing and Beverage Industry

Even low concentrations of oxygen influence shelf-life and the taste of certain beverages. Due to the extraordinary low detection limit and outstanding accuracy of PreSens trace oxygen sensors, the quality of oxygen-sensitive products such as beer, wine and soft drinks is secured.
The optical sensors have – compared to standard electrodes – a very fast response time and they are very easy to maintain.


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 range0 – 10 % O2
0 – 100 hPa

0 – 4.5 mg/L

0 – 140 µmol/L
Limit of detection0.007 % oxygen3 ppb
Resolution

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

± 0.7 ppb at 3 ppb
± 2.5 ppb at 1000 ppb

Accuracy at + 20 °C*± 3 ppb or ± 3 % rel.
Measurement temperature rangefrom 0 °C 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-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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