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Robust Oxygen Probe for Process Control

Oxygen Probe for In-Line Measurement OIM-PSt3

The oxygen probe for in-line measurement (OIM) consists of a fitting made of stainless steel with an optical exchange cap (OEC) in which the oxygen sensor is integrated. The OEC is screwed to the top of the metal fitting, and can be exchanged. The OIM is connected to the oxygen meter via an optical fiber, has a standardized thread and length and is compatible with most bioreactors and port adapters. In addition, customized fittings for e. g. sight glasses are offered.

  • Stands autoclaving, SIP (+ 130 °C, 1.5 atm) & CIP (2 % NaOH, + 80 °C)
  • Polarization-free
  • No membrane cleaning and replacement necessary
  • No electrolyte solutions to replenish
  • Pressure resistant
  • Measurement in steel fermenters
  • Oxygen measurements in biotech & pharma

Applications

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.


Technical

SpecificationsGaseous & Dissolved O2Dissolved O2
*after two-point calibration as described in the manual
Measurement range

0 – 100 % O2

0 – 1000 hPa

0 – 45 mg/L

0 – 1400 µmol/L
Limit of detection0.03 % oxygen15 ppb
Resolution

± 0.01 % O2 at 0.21 % O2
± 0.1 % O2 at 20.9 % O2
± 0.1 hPa at 2 hPa

± 1 hPa at 207 hPa

± 0.004 mg/L at 0.091 mg/L
± 0.04 mg/L at 9.1 mg/L
± 0.14 µmol/L at 2.83 µmol/L

± 1.4 µmol/L at 283.1 µmol/L
Accuracy*± 0.4 % O2 at 20.9 % O2
± 0.05 % O2 at 0.2 % O2
Drift at 0% oxygen < 0.03 % O2 within 30 days (sampling interval of 1 min.)
Measurement temperature rangefrom 0 °C to + 50 °C
Response time (t90)< 6 sec.< 40 sec.
Properties
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 procedureSteam sterilization
Ethylene oxide (EtO)
Cleaning procedureCleaning 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 air-saturated environment
Storage stability24 months provided the sensor material is stored in the dark

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