8-73
6. Turn on the gas source and enter standby mode.
7. Choose Setup > Service > Diagnostic Tests > Valves and set the A/D value of the
PEEP valve properly so that the PEEP exceeds 40 cmH2O. Set the PEEP safety valve to
the ON state. See the figure below.
Set the A/D value of the inspiratory valve properly so that the flow at the inspiratory valve reaches
a certain value. Under these circumstances, the flow volumes measured by the ventilator flow
sensor, inspiratory flow sensor and expiratory flow sensor should be the same. Set the A/D value
of the inspiratory valve to test multiple points. The flow volumes measured by the three sensors at
each point should be the same. If the measured values are different, the measured values are
inaccurate. Check the possible causes marked with an asterisk (*) in the table above.
8.5 Sensor and Valve Faults
To identify sensor or valve faults by using the valve diagnosis tool, you must be familiar with the
mapping between the menu items on the tool interface and the actual airways and hardware parts.
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