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.
Test
| 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 % |
Conclusion:
- 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
