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Trace Oxygen Measurements with Excellent Lont-Term Stability
Oxygen Dipping Probe DP-PSt6
The oxygen probe DP-PSt6 for measurement in trace oxygen range basically consists of a polymer optical fiber with an oxygen-sensitive sensor foil attached to one end. It has a measurement range of 0 - 5 % oxygen with a detection limit of 1 ppb. This 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.
- Measurement range of 0 - 5 % O2 with 1 ppb detection limit
- 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
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
| Specifications | Gaseous & Dissolved O2 | Dissolved O2 |
|---|---|---|
| *after two-point calibration as described in the manual | ||
| Measurement range | 0 – 5 % O2 0 – 41.4 hPa | 0 – 2 mg/L 0 – 56.9 µmol/L |
| Limit of detection | 0.002 % oxygen | 1 ppb |
| Resolution | ± 0.0007 % O2 at 0.002 % O2 | ± 0.0003 mg/L at 0.001 mg/L |
| Accuracy* | ± 1 ppb or ± 3 % of the respective concentration; whichever is higher | |
| Drift at 0 % oxygen | < 2 ppb within 30 days (sampling interval of 1 min.) | |
| Measurement temperature range | from 0 to + 50 °C | |
| Response time (t90) | < 6 sec. | < 40 sec. |
| Properties | ||
| Compatibility | Aqueous solutions, ethanol, methanol | |
| No cross-sensitivity | pH 1 – 14 | |
| Cross-sensitivity | Organic solvents, such as acetone, toluene, chloroform or methylene chloride Chlorine gas | |
| Sterilization procedure | Ethylene oxide (EtO) | |
| Cleaning procedure | 3 % H2O2 | |
| Calibration | Two-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and a second calibration value optimally between 1 % and 2 % oxygen | |
| Storage stability | 60 months provided the sensor material is stored in the dark | |
Related products
Resources
FAQs
How do I import data into excel from a text file containing measurement data?
How does an oxygen sensor work?
How does salinity affect the oxygen measurement?
How does temperature affect the oxygen measurement?
The Stern-Volmer-equation
What are the response times for the oxygen sensors based on the 2 mm fiber like non-invasive oxygen sensors and oxygen probes?
What is the time of delivery?
Which substances can interfere with the optical O2, pH and CO2 measurements?
Manuals
Brochures
Software
PreSens Datamanager version 2.0.0.57 - Windows XP/Vista/7/8
PreSens Oxygen Calculator version 3.1.1 - Windows 7/8/10