c. Zeroing the Breathing Circuit Pressure Gauge. You should check the
breathing circuit pressure gauge before each use of the apparatus to make sure the
needle rests at zero. If zeroing is necessary, perform the following steps:
Place the apparatus in an upright position.
(2) Adjust the small slotted screw under the edge of the gauge body by
turning the screw and observing the gauge dial.
(3) Adjust the gauge until the pointer rests at zero (plus or minus 1
millimeter of mercury [ 1 mm Hg]).
d. Leak Test Procedures. You must ensure there are no significant gas
leakages from the anesthesia apparatus to the atmosphere. To do this you must
perform a series of leak test procedures. Perform these procedures before each use of
The leakage of gases and vapors to the atmosphere from the
anesthesia apparatus circuits may deprive the patient of metered gases
and the anesthetic agent. It also may pollute the atmosphere. It could
unnecessarily expose the medical staff to the anesthesia. It is important
that you perform tests to determine possible leakage before each use of
the apparatus. You must reduce the leakage to an acceptable level. Do
not use the apparatus if the apparatus circuit does not conform to the
stated specifications. No repair should ever be undertaken or attempted
by anyone not having training for repairing devices of this nature.
(1) Leak test procedure number 1. Perform Leak Test Procedure Number 1
to determine if there is a significant leak within the circuit from the cylinder valve to the
end of the supply hose.
(a) Disconnect the supply hoses from the supply head.
(b) Plug the open end of the supply hose with the protective closure
Open the cylinder valves S-L-O-W-L-Y.
(d) Note the pressure gauge readings on the regulator assembly