624074/07 4-13
4.3.2.2 Tightness test
NOTE:
• Ensure another source of ventilatory support is avai-
lable during this test. The patient must be discon-
nected from the ventilator while performing this test.
• Patient alarms are suppressed during the tightness
test.
• To cancel the tightness test while in progress, select
Tightness again, or close the
Tests & calib
win-
dow.
• To ensure valid results, DO NOT touch the screen
during the test.
Description: This test checks for leakage in the patient breath-
ing circuit and determines the circuit’s compliance compensa-
tion factor. The device uses this factor to compensate the
volume lost due to circuit compliance. The ventilator is pressur-
ized to 50 cmH2O. The circuit is considered tight if this pres-
sure can be maintained. If there is a leak, the pressure falls in
proportion to the size of leak.
Procedure:
1. Set the ventilator up as for normal ventilation, complete
with breathing circuit.
2. From the Tests & calib window, select
Tightness
.
3. If you have not already disconnected the patient, the
message bar displays Disconnect patient. Disconnect the
breathing circuit on the patient side of the flow sensor.
4. The message bar displays
Tighten patient system
.
Block the opening (a finger covered with an alcohol pad
may be used).
5. Wait for a few seconds, and Verify that the message bar
displays
Patient system tight
.
6. Reconnect the patient, and close the
Tests & calib
window.
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