A5/A3â„¢ Service Manual 046-001141-00 3 - 23
Periodic Maintenance Functional Tests
FIGURE 3-24 Diagnostic Tests > Valves Menu
7. Set safety valve to [ON].
8. Set the PEEP valve pressure to 30 cmH2O.
9. Set the Insp Valve Flow to the following values:
3L/min, 10L/min, 20L/min, 30L/min, 60L/min.
Make sure that the deviation between the measured data of the Flow Sensor, Insp Flow Sensor
and Exp Flow Sensor does not exceed 1 L/min or 5% of the measured value of the calibration
device, whichever is greater. Otherwise, refer to ‘‘If measurement deviations are not corrected
after multiple flow sensor calibrations, the user is recommended to replace the flow sensor and
then perform calibration. If the problem persists, factory maintenance is necessary.’’ on page
4-18 to perform flow calibration again. When testing the flow accuracy of (60±3)L/min, only
compare the accuracy of the Insp Flow Sensor and Exp Flow Sensor. It is no need to compare
the int-Flow Sensor.
10. When finished, reinstall the bellows and the water trap.
3.8.7 Check the Pressure Sensor Accuracy
NOTE: Generally, measurement deviations do not easily occur to pressure
sensors. However, in case of replacing the Ventilator Control Board,
Solenoid Valve Assembly, or Drive Gas Assembly, you need to perform
pressure calibration and check the flow sensors accuracy so as to
confirm the effectiveness of calibration.
NOTE: You can use any pressure meter that has an accuracy of at least ±2% for
the accuracy measurement of the pressure sensors.
To check the measurement accuracy of pressure sensors:
1. Perform pneumatic connections as follows:
The following pictures show the four-way device:
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