Gradian Universal Anaesthesia Machine, Maintenance Manual

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13
PREPARING THE UAM FOR USE
1.
Connect pipeline hoses and cylinders.
2.
Open the top rear access panel if working on UAM B. Screw in oxygen sensor and connect telephone-style cable. Some
oxygen sensors come with an extra piece: this may be discarded. (See photo on next page.)
USING OXYGEN
The UAM accepts an E-size pin-index oxygen cylinder. The cylinder connects via a yoke and Bodok seal and the pressure is
displayed on the pressure gauge on the front of the machine.
Bull-nose cylinders may be attached to the pipeline inlet using an approved 4 Bar medical regulator.
USING A PIPELINE CONNECTOR
The UAM accepts pipeline connections for oxygen. Each machine is supplied with an oxygen hose connecting to the UAM’s
NIST inlet. The other end is typically shipped with a BS 5682 probe, which is the British standard. Probes for other connector
types can be arranged. Pipeline pressure is displayed on the gauge on the front of the machine.
USING THE EMERGENCY OXYGEN INLET
An emergency oxygen supply connection is mounted on the back of the machine. It accommodates differing tube sizes
from ward-style flowmeters.
CAUTION:
Oxygen from this source is not controlled by the rotameter bank on the front of the UAM. Rather, it must be
controlled with an external flowmeter attached to the cylinder providing the emergency oxygen. The user can confirm that
oxygen is being given by observing the oxygen analyzer.
NOTE:
Use only 1 L/minute flow to conserve the oxygen in the external cylinder. This will provide 30-35% oxygen to the
patient.
USING NITROUS OXIDE
The UAM supports cylinder and pipeline sources of nitrous oxide. The flow of N
2
O is controlled by the right hand side flow
dial. The N
2
O flow dial has a different size and shape to distinguish it from the oxygen flow dial.
The UAM automatically cuts off nitrous oxide if the percent of oxygen in the anesthetic mix falls to 25% and below. The
oxygen analyzer must be powered on and working correctly for nitrous oxide delivery to occur. An exhausted oxygen sensor
or battery will shut off N
2
O supply.
The cut off mechanism is electrical, unlike older style mechanical interlocks. The N
2
O valve is closed in its resting position
and must receive a current from the oxygen analyzer to open. Any interruption of that current, including a decrease in
oxygen below 25%, will shut off the flow of nitrous oxide.
NOTE:
Do not open the package of the spare oxygen sensor until it is needed. The oxygen sensor will start to deplete as
soon as it comes into contact with air.