Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

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Datex-Ohmeda ADU
C-24
Document No. 8502855
10. The driving gas connection at the Bellows Block
The driving gas connection at the Bellows block is in only used in Auto ventilation mode. Trough this
connection, the driving gas is pressed into the block and inside the bellows chamber.
11. The scavenging connection at the Bellows Block
The connection is used in both Auto and Manual ventilation modes. Through this connection the used
patient gases are routed from the Bellows Block into the scavenging system.
12. The pressure measuring connection at the Bellows Block
The connection is used both in Auto and Manual ventilation modes. The patient circuit pressure is
measured in the Bellows Block at this connector.
13. The Restrictor in the overflow valve channel
The restrictor is placed in the gas channel between the chamber to the top of the overflow valve.
The restrictor damps the oscillation effect to the overflow valve during the expiration phase; a too high
oscillation in the patient circuit can otherwise affect the spirometry volume measurement.