Problem: we are not achieving more than 81% of oxygen concentration at the patient.
Test setup: The Fluke gas flow analyser is placed in different parts of the air/oxygen circuit to isolate the suspected leak.
|Machine 1||Machine 2||Machine 3||Machine 4|
|F102 = oxygen sensor||91 %||90 %||82 %||82 %|
|Between lung and oxygen sensor (fluke)||97 %||98.7||90 %||94.3 %|
|Between oxygen sensor and bellow||97.5 %||99.1 %||91 %||94.8 %|
|Between bellow en distribution block||98 %||99.7 %||98 %||99.5 %|
- machine 3 and 4 had bellows assembled without seals and were leaking
- several oxygen sensors were also leaking and were fixed
- after fixes, oxygen sensors still measure 7% lower than the Fluke. This was fixed in firmware
- the oxygen test is a valid test to see if there is leakage in both bellow and/or oxygen sensor