Oxygen Monitoring in Pipes at Changing Temperatures

Metal Flow-Through Cell with Integrated O2 and Temperature Sensor FTM2-PSt3/Pt100

This metal flow-through cell contains a sensor stick with PSt3 sensor (max. measurement range 0 - 100 % O2, limit of detection 0.03 % O2) and additionally has an integrated Pt100 temperature sensor. It has a connector diameter of 1/4" and is ideally suited for monitoring in liquids or gases at changing temperature, ensuring precise temperature compensated measurements. The sensor stick can easily be exchanged if necessary. The oxygen sensor is very robust and long-term stable. It can be cleaned by CIP (Cleaning in place, + 80 °C and 2 % NaOH) and stands steam sterilization (+ 130 °C, 1.5 atm). A polymer optical fiber with protective metal spiral tube is attached to the FTM2 via SMA connector.

  • Max. measurement range of 0 - 100 % O2, limit of detection 0.03 % O2
  • Integrated Pt100 temperature sensor
  • No consumption of oxygen
  • Signal independent of flow velocity
  • Autoclavable, SIP (+ 130 °C, 1.5 atm) & CIP (+ 80 °C, 2 % NaOH)
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Gaseous & Dissolved O2
Dissolved O2
*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
Max.**: 0 - 100 % O2, 0 - 1000 hPa
Optimal: 0 - 22.5 mg/L
Max.**: 0 - 45.0 mg/L
Limit of detection*0.03 % O20.020 mg/L
Resolution*1 % O2 ± 0.02 % O2
20.9 % O2 ± 0.1 % O2
50 % O2 ± 0.4 % O2
0.4 mg/L ± 0.009 mg/L
9 mg/L ± 0.04 mg/L
Response time (t90)< 10 sec.***< 30 sec.****
Temperature sensor measurement range0 °C to + 50 °C
Temperature sensor resolution± 0.1 °C
CompatibilityAqueous solutions, ethanol, methanol
No cross-sensitivitypH 1 - 14, CO2, H2S, SO2, ionic species
Cross-sensitivityOrganic solvents such as pure acetone, toluene, chloroform or methylene chloride
Chlorine gas
Sterilization procedureSteam sterilization
Ethylene oxide (EtO)
Gamma irradiation
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 stability5 years provided the sensor material is stored at room temperature in dry conditions and in the dark
Pressure resistance10 mbar up to 20 bar (up to 100 bar on special request)
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
FTM2 format

Connector diameter: 1/4"
Inner diameter: 4.8 mm
Inner volume: 0.9 cm3
Material: stainless steel 316 (body), 316L (sensor stick), 316Ti (Pt100)

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