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Rosemount™ 550DW Single-Use Dissolved Oxygen Sensor Adapter
The Rosemount 550DW Single-Use Dissolved Oxygen Sensor Adapter is compatible with standard stainless-steel dissolved oxygen (DO) sensors, currently validated with the Rosemount Hx438 Dissolved Oxygen Sensor, and enables placement into a single-use bioreactor bag.
Only the gamma-irradiated dissolved oxygen sensor adapter touches the process solution, meaning the sensor can be reused for multiple batches. The dissolved oxygen sensor adapter has a three-year shelf life and can be air-calibrated prior to start-up to verify functionality with no fill product needed in the bioreactor bag.
Rosemount™ 550DW Single-Use Dissolved Oxygen Sensor Adapter


Measurement Type
DO - Dissolved Oxygen
Process Wetted Material
ULTEM™ Silicone, EPDM (USP Class VI and ADI-free)
Operating Temperature
4 to 40 °C (39 to 104 °F)
Operating Pressure
0 - 10 psi without sensor installed
Sensor Type
12 mm (.5 inches) diameter x 120 mm (4.72 inches) length
Overall Length
Sensor insertion length: 120 mm (4.72 inches)
Process Connection
Sensor Connection: PG 13.5
Compatible Devices
Rosemount 56 Dual Channel Transmitter


  • Sensor window compatible with standard dissolved oxygen sensors without reducing measurement performance
  • Adapts dissolved oxygen sensors designed for stainless steel bioreactors into single-use bioreactor bags
  • Adapter arrives installed and gamma-irradiated with the single-use bioreactor bag
  • Membrane allows for up to 10 psi without a sensor supporting, and up to 30 psi with the sensor in place
  • Compatible with 120 mm sensor with a PG13.5 process connector
  • All wetted materials are are USP Class VI, ADI-free, and chosen for minimal extractables
  • Reuse dissovled oxygen sensor across multiple batches without autoclaving as it does not contact process solutions
  • Optimized for use with Rosemount Hx438 Dissolved Oxygen Sensor and Rosemount 56 Dual Channel Transmitter for software compatibility
  • Rosemount 550DW Dissolved Oxygen Sensor Adapter has a shelf life of three years