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5 Preoperative Tests
M1132382
5-5
Flow control test
WARNING The Link-25 system cannot replace an O2 monitor.
Sufficient O2 in the fresh gas may not prevent hypoxic
mixtures in the breathing circuit.
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Nitrous oxide (N2O), if available, flows through the system
during this test. Use a safe and approved procedure to
collect and remove the N2O.
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Incorrect gas mixtures can cause patient injury. If the
Link-25 system does not supply O2 and N2O in the
correct proportions, do not use the system.
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This procedure tests for significant malfunction of the
Link-25 system. It does not confirm the proper calibration
of the Link-25 system. Perform periodic calibrations using
an accurate and properly calibrated O2 monitor as
recommended in the “ User Maintenance ” section.
1. Connect the pipeline supplies or slowly open the cylinder valves.
2. Turn all flow controls fully clockwise for minimal flow.
3. Set the ACGO switch to ABS.
4. Set the System switch to On.
Note Do not use the system if the Low battery or any ventilator failures
occur.
5. Make sure that the O2 flow tube shows approximately 0.025 to
0.075 l/min.
WARNING Keep the Link-25 system engaged. Adjust only the test
control for the following steps.
• Test N2O first and then O2.
• The O2 cell must be correctly calibrated.