Replacement Trace Oxygen Sensor for OIMs or OXYPro® TR / TRM

Oxygen Exchange Cap OEC-PSt6-YAU

The Oxygen Exchange Cap with integrated sensor type PSt6 is made of stainless steel. The sensor has a maximum measurement range of 0 - 10 % oxygen, with a detection limit of 0.002 % O2. The OEC-PSt6-YAU is available in different versions: YOP for bioprocess monitoring, safe for food applications (CAF), or with a hydrophobic Teflon coating (PTFE) for measurements in aggressive environments. It can be screwed to the top of an OIM (Oxygen Probe for In-line Measurements) or the OXYPro® TR / TRM. This way a used sensor can easily be exchanged as the cap can be calibrated with one fast barcode scan. OEC-PSt6-YAU stands cleaning in place & steam sterilization.

  • Maximum measurement range of 0 - 10 % O2
  • Different versions: food applications, aggressive environments
  • Stands SIP (max. + 140 °C, 1.5 atm) & CIP (+ 80 °C, 2 % NaOH)
  • 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 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.


*at 20 °C, 960 - 980 hPa; humidified gas mixture
**after customized calibration
***determined changing from 20.9 % oxygen gas to nitrogen 5.0
****determined changing from air-saturated water to a freshly prepared 1 % sodium sulfite solution
Measurement range*Optimal: 0 - 5 % O2, 0 - 50 hPa, 0 - 2.0 mg/L
Max.**: 0 - 10 % O2, 0 - 100 hPa, 0 - 4.5 mg/L
Limit of detection*0.002 % O2, 0.02 hPa, 1 ppb
Resolution*0.002 % O2 ± 0.0006 % O2, 0.046  % O2 ± 0.0008 % O2, 0.2 % O2 ± 0.001 % O2
1 ppb ± 0.3 ppb, 20 ppb ± 0.4 ppb, 100 ppb ± 0.5 ppb
Response time (t90)
Gaseous O2***
Dissolved O2****

< 10 sec.
< 30 sec.

< 15 sec.
< 40 sec.

< 85 sec.
< 100 sec.
CompatibilityAqueous solutions, ethanol, methanol
No cross-sensitivity topH 1 - 14, CO2, H2S, SO2, ionic species
Cross-sensitivity toChlorine gas
Organic solvents such as pure acetone, toluene, chloroform or methylene chloride
Steam sterilization (max. + 140 °C, 1.5 atm)YesYesYes
Cleaning in Place (CIP)
(+ 80 °C, 2 % NaOH)
Cleaning Procedure3 % H2O2, acidic agents (HCl, H2SO4) max. 4 - 5 %
Cleaning agents containing ClO2 at room temperature
CalibrationTwo-point calibration in oxygen-free environment (e. g. nitrogen 5.0, 1 % sodium sulfite solution) and a second calibration medium between 1 and 2 % oxygen
Storage stability5 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 operationOptimal: 0 °C to + 50 °C
Max.: - 40 °C to + 90 °C
Temperature range storageOptimal: room temperature (+ 20 °C ± 5  °C)
Max.: 0 °C to + 70 °C
Variants-Safe for food applicationsHydrophobic Teflon coating

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