Mindray Datascope AS 3000, Service Manual

Page: 23 / 180

Components Theory of Operation
1 - 10 0070-10-0683 AS3000™ Service Manual
1.3.7 Adjustable Alarms
Minimum and maximum alarm limits can be set for Peak Pressure, Mean Pressure and FiO
2
.
Minimum alarm limits can be set for Tidal Volume and Minute Volume. Exceeding the peak
pressure alarm limit automatically halts the inspiratory phase preventing airway pressure
from exceeding the high alarm setting. In the CMV mode, when reaching this pressure limit,
a “High Airway Pressure” alarm is displayed, and inspiration is discontinued. The next
inspiration occurs at the regular time interval, preventing increase of the respiratory rate. The
result is a decreased tidal volume (T Vol.) and minute volume (M Vol.). During pressure
limitation, the ventilator displays the alarm message until the condition is corrected.
1.3.8 Compliance Compensation
Compliance compensation automatically corrects for the expansion of the circuit in CMV
ventilation mode. System compliance is measured by the ventilator to maintain the set tidal
volume (±15%). The compliance test may be bypassed at machine power up. When
bypassing the compliance test, the default settings are used.