5-65
4. If when the D/A value of the inspiratory valve is set to more than “4000”, the flow
measured by the standard flow measurement device fails to reach 90 L/min, flow
calibration will be failed. In this case, you need to replace the expiratory valve
assembly or the monitor board.
5. To locate if the DA on the monitor board is faulty, you can use a multimeter to
measure the output of DA on the monitor board corresponding to the inspiratory valve.
If voltage also increases with the increase of D/A value, and voltage nears 6V when
D/A value is set to more than “4000”, it indicates that the DA on the monitor board
corresponding to the inspiratory valve may be normal.
6. After the expiratory valve assembly or monitor board is replaced, you can use the
similar method to check if the problem is fixed.
5.4.3.5 Problems Related to Opening States of the PEEP Safety Valve
and PEEP Valve
When the PEEP safety valve is permanently OFF and the gas supplies are normal, the
[Drive Gas Pressure Low] is alarmed. When the PEEP valve is faulty, pressure related
alarms occur in mechanical ventilation state.
By using the valves-test tool, you can detect if the opening states of the PEEP safety valve
and PEEP valve are normal.
To diagnose the opening state of the PEEP safety valve:
1. Make sure that gas supplies are normal.
2. In the [Valves-Test Tool] menu, when the PEEP safety valve is switched on, a subtle
click is heard.
3. Adjust the D/A value of the PEEP valve to cause the pressure measured by the PEEP
pressure sensor to exceed 0 cmH2O.
4. Switch off the PEEP safety valve. The pressure measured by the PEEP pressure sensor
should drop to 0 cmH2O immediately. Switch on the PEEP safety valve again. The
measured value of the PEEP pressure sensor rapidly restores almost the same value to
that before PEEP safety valve is switched off. During this period, gas flow and also
change of gas flow when the PEEP safety valve is switched on or off can be felt at the
PEEP outlet, which helps to judge if the PEEP safety valve can be switched on or off
normally.
5. If an error is detected, it is possible that the PEEP safety valve or the safety valve drive
voltage on the monitor board is faulty. You can use a multimeter to measure the drive
signals on the monitor board corresponding to the PEEP safety valve (measurement
can be performed at the corresponding socket). When the PEEP safety valve is turned
on, the drive voltage should near 6V. When the PEEP safety valve is turned off, the
drive voltage should near 0V. If these two conditions are met simultaneously, the
monitor board is normal.
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