Trace Oxygen Measurement in Metal Flow-Through Connectors FTM

Oxygen Exchange Window OEW-PSt6

The Oxygen Exchange Window is integrated in the FTM-PSt6. It enables to easily exchange a used sensor coating without having to replace the whole flow-through connector. The integrated PSt6 type sensor allows trace oxygen measurements in gases and liquids. It has a measurement range of 0 – 5 % oxygen, with a detection limit of 0.002 % oxygen.

  • Easy exchange of a used sensor coating
  • Online oxygen measurement in perfusion systems
  • No consumption of oxygen
  • Signal independent of flow velocity
  • Autoclavable, SIP (+ 130 °C, 1.5 atm) & CIP (2 % NaOH, + 80 °C)
  • Polarization-free
  • Long-term stability


Process Control in Biotech & Pharma

The OIMs, the oxygen probes for in-line measurement, are designed for harsh conditions like high pressure or oil/water mixtures. These systems give high accuracy and are almost maintenance-free as they do not contain any membranes and electrolytes. The sensors are fully autoclavable and sterilizable (CIP & SIP).

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.


SpecificationsGaseous & Dissolved O2Dissolved 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 detection0.002 % oxygen

1 ppb


± 0.0007 % O2 at 0.002 % O2
± 0.0015 % O2 at 0.2 % O2
± 0.007 hPa at 0.023 hPa

± 0.015 hPa at 2.0 hPa

± 0.0003 mg/L at 0.001 mg/L
± 0.0006 mg/L at 0.09 mg/L
± 0.010 µmol/L at  0.03µmol/L

± 0.020 µmol/L at 2.8 µmol/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 rangefrom 0 to + 50 °C
Response time (t90)< 6 sec.< 40 sec.
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 procedure

Steam sterilization
Ethylene oxide (EtO)
Gamma irradiation

Cleaning procedure

Cleaning in place (CIP, 2 % NaOH, + 80 °C, + 176 °F)
3 % H2O2
Acidic agents (HCl, H2SO4), max. 4 % – 5 %

CalibrationTwo-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and a second calibration value optimally between 1 % and 2 % oxygen
Storage stability24 months provided the sensor material is stored in the dark

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