The Mettler Toledo InPro6950i/12/120 Polarographic Dissolved Oxygen Sensor is designed for in-line measurement of trace dissolved oxygen in liquid process streams.
Its four-electrode measurement system, including a guard electrode and reference electrode, supports low-ppb oxygen measurement in applications such as carbon dioxide recovery and conditioning.
This digital sensor features a 12mm body and 120mm immersion length for integration into compatible process housings.

ISM technology, automatic temperature compensation and a steam-sterilizable construction support measurement management in demanding beverage process environments.
Key Characteristics
- Polarographic/amperometric dissolved oxygen measurement principle
- Four-electrode design with cathode, anode, reference electrode and guard electrode
- Operating range from 0.1 ppb to air saturation
- 12mm sensor diameter with 120mm immersion length
- Digital ISM technology with K8S IP68 cable connection
- Automatic temperature compensation through a built-in RTD
- PTFE/silicone oxygen-selective membrane reinforced with steel mesh
- AISI 316L stainless-steel wetted components with a polished surface finish
- Measuring temperature range from 32°F to 176°F (0°C to 80°C)
- Measuring pressure range from 2.9 to 130 psi absolute (0.2 to 9 bar absolute)
- Steam-sterilizable construction
Ideal Applications
- Trace dissolved oxygen measurement in brewery processes
- Carbon dioxide recovery after the recovery stage
- Carbon dioxide conditioning
- Low-level oxygen measurement in liquids containing CO₂
- In-line measurement where low-ppb oxygen detection is required
Product Family Includes
- InPro6950i/12/70
- InPro6950i/12/120
- InPro6950i/12/220
- InPro6950i/12/320
Industries Served
- Brewing
- Beverage Processing
- Carbon Dioxide Recovery and Conditioning






