Replacement Oxygen Sensor for OXYBase® WR

Oxygen Exchange Cap OEC-PSt3-NAU

The Oxygen Exchange Cap is made of stainless steel and has an integrated sensor type PSt3. This sensor has a maximum measurement range of 0 - 100 % O2, and a detection limit of 0.03 % O2. It can be screwed to the top of the OXYBase® WR fitting to replace a used sensor. The OEC-PSt3-NAU is available in different versions: USP Class VI compatible (YOP), safe for food applications (CAF), with hydrophobic Teflon coating (PTFE), or without optical isolation for fast response times (OIW). The cap is not autoclavable.

  • Maximum measurement range of 0 - 100 % O2
  • Different versions: USP Class VI compatible, food applications, aggressive environments, or fast response time
  • Easy exchange due to barcode calibration
  • Pressure resistant
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*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 - 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
Response time (t90)
Gaseous O2***
Dissolved O2****

< 10 sec.
< 30 sec.

< 15 sec.
< 40 sec.

< 85 sec.
< 100 sec.

< 3 sec.
< 3 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
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 gas, 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* 3 bar
Temperature range operation Optimal: 0 °C to + 40 °C
Max.: - 10 °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 Fast response time

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