1. Anesthesia Apparatus Checkout Recommendations
These recommendations are valid only for an anesthesia system that conforms to current and relevant standards and includes :
1)An ascending bellows ventilator
2) At least the following monitors: capnograph, pulse oximeter, oxygen analyzer, respiratory volume monitor (spirometer)
3)Breathing system pressure monitor with high- and low-pressure alarms.

2. Checking Your Anesthesia Workstation
A complete anesthesia apparatus checkout procedure must be performed each day before the anesthesia workstation is first used.
Several checkout procedures exist, but the 1993 FDA Anesthesia Apparatus Checkout Recommendations.
As a result, in 2005 the ASA's Committee on Equipment and Facilities began to develop a revised pre-use checklist that was designed to be more workstation specific and, indeed, was intended to eventually replace the 1993 FDA Anesthesia Apparatus Checkout Recommendations.

3. Checking Anesthesia Machines
8 Categories of check:
Emergency ventilation equipment
High-Pressure system
Low-Pressure system
Scavenging system
Breathing system
Manual and automatic ventilation system
Monitors
Final Position

4. Abbreviated Machine Check Out
Calibrate Oxygen Monitor
Check Machine for gas delivery
Check Circuit for integrity
Check Ventilator for function
Check Exhaust for function

5. Testing Specific Components of the Anesthesia Delivery System
The three most important preoperative checks are :
1) calibration of the oxygen analyzer,
2) the low-pressure circuit leak test,
3) the circle system tests.

7. Gas Line Filters sometimes crack

8. Suction can fail in many ways
DISS (Diameter Index Safety System) Connector Unscrewed at Wall
Vacuum Switched Off at DISS Connector

9. Canister vacuum problem
Hose disconnect from canister
Canister switched off
Insert seated incorrectly
Any port or hole open
Hose disconnect from holder
Tubing disconnect from canister
Flap valve closed
Canister Tilted
Canister Full
Hose kinked

10. Tighten Expiratory Valve Cover

11. Expiratory Valve - Missing O Ring

12. Valve and cage

13. Replace valve, cage, o-ring

14. Replace Cover

15. Tighten Expiratory Valve Cover

16. H tanks
Bulk Tanks

17. High-Pressure System Check Oxygen Cylinder Supply:
 a.    Open the O2 cylinder and verify that it is at least half full (≈1000 psi). 
 b.    Close the cylinder.  
.Check Central Pipeline Supplies: Check that hoses are connected and pipeline gauges read about 50 psi.

20. Calibration of the Oxygen Analyzer
The oxygen analyzer is one of the most important monitors on the anesthesia workstation.
It is the only machine safety device that evaluates the integrity of the low-pressure circuit in an ongoing fashion.
Other machine safety devices, such as the fail-safe valve, the oxygen supply failure alarm, and the proportioning system, are all upstream from the flow control valves.
The only machine monitor that detects problems downstream from the flow control valves is the oxygen analyzer.
The actual procedure for calibrating the oxygen analyzer has remained reasonably similar over the recent generations of anesthesia workstations.

21. Cont
Generally, the oxygen concentration–sensing element must be exposed to room air for calibration to 21%.
This may require manually setting a dial on older machines, but on newer ones, it usually involves only temporary removal of the sensor, selecting and then confirming that the oxygen calibration is to be performed from a set of menus on the workstation's display screen, and finally reinstalling the sensor.

25. Machine outlet check valve