21
5 Testing Unit Functions
5.1 Dosage valves of the Gas Mix Unit
When closing the dosage valves make sure that the respective floating marker of the
respective measuring tubes are re-set to zero. Otherwise, a leakage of the respective
spindle will result that must be remedied by a service technician.
5.2 O
2
-Flush
Before each operation of the ventilation unit check to see whether the O
2
bypass valve
immediately and automatically closes after releasing the push-button.
Basic Setting:
Dosage valve (1) on measuring tube section is closed.
Conducting Test:
Briefly press the bypass button. On release of the push-button it immediately return to its
initial position.
5.3 AIR / N
2
O Mode Switch
Basic Setting:
O
2
dosage valve closed
N
2
O dosage valve set to 3 litres per minute
AIR dosage valve set to 3 litres per minute
Mode Switch in „N
2
O“ position
Anesthesia aspiration unit connected
O
2
monitor calibrated and in operating mode
Conducting Test:
The measuring tubes for N
2
O must show 3 litres per minute flow, while the compressed
measuring tube must indicate no flow. The O
2
monitor shows approx. 0% O
2
(after a brief
waiting time).
When switching from N
2
O to AIR – without changing dosage valve status – indication of
floating marker of the N
2
O measuring tube must return to zero, while, at the same time the
display of the compressed-air measuring tube must indicate 3 litres per minute. The O
2
monitor shows 21% O
2
as comfirmation.