Replacement Oxygen Sensor for OIM

Oxygen Exchange Cap OEC-PSt3-YAU

The Oxygen Exchange Cap is made of stainless steel and has an integrated sensor type PSt3. The sensor has a maximum measurement range of 0 - 100 % oxygen, and a detection limit of 0.03 % oxygen / 20 ppb. It stands steam sterilization and cleaning in place. The cap is available in different versions: USP Class VI compatible (YOP) for bioprocess monitoring, safe for food applications (CAF), or with a hydrophobic Teflon coating (PTFE) for measurements in aggressive environments. The cap can be screwed to the top of an OIM (Oxygen Probe for In-line Measurement) fitting. A used sensor on the probe can easily be exchanges as sensor calibration can be done via one fast barcode scan.

  • Maximum measurement range from 0 - 100 % O2
  • Different versions: USP Class VI compatible, food applications, aggressive environments
  • Stands SIP (max. + 140 °C, 1.5 atm) & CIP (2 % NaOH, + 80 °C)
  • Easy exchange due to barcode calibration
  • Pressure resistant
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Process Control in Biotech & Pharma

The OIMs, the oxygen probes for in-line measurement, are designed for harsh measurement conditions. 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.



*at 20 °C, 960 - 980 hPa: humidified gas mixture
**after customized calibration
***after two-point calibration as described in the manual
****determined changing from 20.9 % oxygen to nitrogen 5.0
*****determined changing from air-saturated water to a freshly prepared 1 % sodium sulfite solution

Measurement range*

Optimal: 0 - 50 % O2, 0 - 500 hPa, 0 - 22.5 mg/L
Max.**: 0 - 100 % O2, 0 - 1000 hPa, 0 - 45 mg/L

Limit of detection* 0.03 % O2, 0.3 hPa, 0.020 mg/L
Resolution* 1 % O2 ± 0.02 % O2, 20.9 % O2 ± 0.1 % O2
0.4 mg/L ± 0.009 mg/L, 9 mg/L ± 0.04 mg/L
Accuracy at 20 °C*** 1 ± 0.05 % O2, 20.9 ± 0.2 % O2
Response time (t90)
Gaseous O2****
Dissolved O2*****

< 10 sec.
< 30 sec.

< 15 sec.
< 40 sec.

< 85 sec.
< 100 sec.
Compatibility Aqueous solutions, ethanol, methanol
No cross-sensitivity to pH 1 - 14, CO2, H2S, SO2, ionic species
Cross-sensitivity to Chlorine gas
Organic solvents such as pure acetone, toluene, chloroform or methylene chloride
Steam sterilization
(max. + 140 °C, 1.5 atm)
Yes Yes Yes
Cleaning in Place (CIP)
(+ 80 °C, 2 % NaOH)
Yes Yes Yes
Cleaning Procedure 3 % H2O2, acidic agents (HCl, H2SO4) max. 4 - 5 %
Cleaning agents containing ClO2 at room temperature
Calibration Two-point calibration in oxygen-free (e. g. nitrogen 5.0, 1 % sodium sulfite solution) and air-saturated environment (20.9 % oxygen, air-saturated water)
Storage stability 5 years provided the sensor material is stored at room temperature in dry conditions and in the dark
Pressure resistance* 10 mbar up to 12 bar
Temperature range operation Optimal: 0 °C to + 50 °C
Max.: - 40 °C to + 90 °C
Temperature range storage Optimal: room temperature (+ 20 °C ± 5  °C)
Max.: 0 °C to + 70 °C
Variants USP Class VI compatible Safe for food applications Hydrophobic Teflon coating

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