Instructions

3 of 3
P/N 10435200 Rev AA1 7/22/21
Midmark Corporation
For contact information, go to :
www.midmark.com
Veterinary Anesthesia Machine Pressure check
It is recommended that anesthesia machines be tested for leaks prior to each veterinary procedure in which
the machine is used.
1. Close the relief valve-exhaust (APL valve, dump valve, pop-off-valve, etc.) and place your thumb over
the patient connection of the Y-piece, found at the end of the breathing circuit.
2. Open the oxygen flowmeter and allow the pressure to fill the machine naturally. Once it reaches 30
cm/H2O on the pressure gauge, turn off the flowmeter.
Note: The breathing bag will inflate during this procedure; there is no cause for concern.
3. Observe the pressure gauge. If the pressure drops from 30-cm H
2
O to 27-cm H
2
O in less than 10
seconds then leak(s) must be fixed.
Common Places for Leaks
• Breathing bag and/or breathing circuit
• Breathing circuit point of connection to machine
• Unidirectional breathing valves
• CO
2
absorber gasket(s)
• Relief valve-exhaust
• Vaporizer inlet and outlet connections; filler cap
• Fresh gas delivery hose and connection to machine
To locate leaks place hand over all connections, the breathing circuit, and bag, while system is pressurized,
and feel for leaks. For hard to find problems, wet hand or use soapy water solution over connections.
Evidence of bubbles will help locate leaks.