Sterile loop calibration system.

摘要

An endless path calibration system (11) comprising a sensor cassette (13) having a flow-through passage and at least one sensor to be calibrated, a chamber coupled to the sensor cassette (13) to define an endless path and a sterile calibration liquid (16) in the endless path. A gas injection passage for injecting gas into the sterile calibration liquid (16) and a gas vent leading from the endless path to the exterior of the endless path. A check valve allows gas to escape from the endless path and substantially prevents gas and liquid from entering the endless path through the gas vent.