Table 3 The circuit volume of anesthesia machine (AM) and time constant at variable rates of fresh gas flow (FGF) and different types of AM
Primus® | Perseus® | Zeus®-F (fresh gas mode) | ||
|---|---|---|---|---|
The circuit volume of AM (the internal volume of AM + the volume of breathing circuit 1.2 L) | 5.9 L | 3.3 L | 3.2 L | |
Time constant (the circuit volume/FGF rate) | ||||
FGF rate | 0.5 L/min | 11.8 min | 6.6 min | 6.4 min |
1 L/min | 5.9 min | 3.3 min | 3.2 min | |
3 L/min | 1.9 min | 1.1 min | 1.0 min | |