Sensors and Valves Problems Repair and Troubleshooting
5 - 72 046-001141-00 A5/A3™ Service Manual
5.4.9 Opening State of the PEEP Valve Problems
When the PEEP valve is defective, pressure related alarms occur in mechanical ventilation modes.
By using Diagnostic Tests, you can detect if the opening states of the PEEP valve is correct.
To diagnose the opening state of the PEEP valve:
1. Make sure that gas supplies are within specifications. In the [Diagnostic Tests] menu, set the
PEEP safety valve to ON.
2. With the increase of D/A value of the PEEP valve, the measured value of the PEEP pressure
sensor (or the anesthesia machine calibration device) should also rise. Note that there is a non-
response area for the PEEP valve when the D/A value is relatively small. When the D/A value is
less than this range, the PEEP valve cannot be opened and the output is “0” continuously. When
the D/A value is greater than this range, the pressure output will increase with the increase of D/
A value. This phenomenon also exists for the inspiratory valve.
3. For subsequent diagnosis rules, refer to ‘‘Opening State of the Inspiratory Valve Problems’’ on
page 5-71.
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