Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

Page: 396 / 494

Datex-Ohmeda ADU
C-70
Document No. 8502855
Pilot pressure level check
The pilot pressure is measured at start-up, as it requires switching the MUX valve away from the
chamber. The pilot pressure is measured and if it is outside the specifications, a status message
‘Pilot press err’ (‘Low pilot press’) is triggered. The message appears on the Service - Diagnostic
page’s status field. Accepted range is 250-310 cmH
2
O.
System checkout troubleshooting guide
If the Manual or Auto mode leak tests fails, the failure reason including the %failure number will be
stored in the System Check - Check Log - Error History page to give a better technical description of
the error that have been logged.
Manual mode leak test
error/
% no
Technical reason Possible cause
Suggested action
Ppeak = Pressure errors
5 Ppat >125 mmH
2
O To high pressure. APL
valve not closed
properly.
- An extra pressure peak is detected during the test
(may have been caused accidentally while
handling the respiratory tubing or open a flow
control.)
-The pressure was higher than 20 cmH
2
O at the
start of the Manual Leak test. Open APL valve to
decrease the pressure before adjusting it to 80
cmH
2
O
56,66,76,
86
Pressure is rising in the
system.
98 Ppat (50 mmH2O) +
10 mmH
2
O < Ppat(80)
Pressure has slowly
increased.
Leak = Leak errors
25 Ppat < 200 mmH
2
O and
V(leak) > 6000 ml/sec
To low pressure
because of leak.
- The manual APL valve is still open
- The respiratory tubing and/or its connections are
leaking
- The manual ventilation bag is leaking
- A gas monitor is connected to the circuit and is
sampling gas.
- Following Leak Tracing Chart for Auto Leak Test in
the “Technical Reference Manual”.
26 Ppat < 200 mmH
2
O and
Ppat > 100 mmH
2
O
Patient pressure is not
enough after 60
seconds.
55,65,75,
85
Ppat < ¾ Pmax Big leak in the system.
Pressure is below ¾ of
max pressure.
94 Ppat (50 mmH2O)
> Pat (80 mmH2O)
+ 50 mmH2O
A small leak during a
longer time.
100 Leak > 150mmH2O Leakage to large.
Switch = Auto/Man. switch errors
31,51,61,
71,81
Auto/Man. switch
changed during test.
- The position of the Auto/Man. selector has been
altered during the test. Repeat the test.
HiFlw = Fresh gas flow detection errors