The Insta Trace from Teledyne are designed with electrochemical oxygen sensors at the trace level. When a common electrochemical trace oxygen sensor is detached from its barrier bag to replace an expired sensor, it is exposed to ambient air of up to 209,000 ppm O2.
During the transition from an oxygen-free area to an exposed area, the device's electrolyte becomes saturated with dissolved oxygen. The longer the exposure, the longer the recovery time will be. The usual recovery time when replacing a sensor is between 6 to 24 hours.
The sensor can measure below 1 ppm of oxygen within 15 minutes of installation. By minimizing the recovery time from many hours to just minutes, users won't need to divert unanalyzed product, and go to liquid back-up (in the case of the air separation industry) or switch analyzers.