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Troubleshooting
8-31
Document no. 2044677-001
7.3 Gas sampling system troubleshooting
The faults which can occur in the sampling system are: leaks or blockages in the tubing, failure
of the sampling pump or the magnetic valves, or diminishing of the flow rates because of dirt
accumulating in the internal tubing.
The following checks should help in localizing the fault. Whenever suspecting the sampling
system and always after having done any work on the sampling system, check and if
necessary adjust the flow rate.
CAUTION
The special internal sample tube is mechanically fragile. Sharp bends will
cause leaks.
NOTE: D-fend water trap should be replaced, when the ‘REPLACE D-FEND’ message appears
during the monitor startup.
NOTE: If any liquid has entered the miniC measuring unit due to water trap filter failure, leave
the module running without a sampling line for several hours and check the functions after it
has dried out.
7.3.1 Sampling system leak test
1.
Connect a flow cassette with a high flow resistance value (50/1.1) to the end of the
sampling line and start following the ‘Amb-Work’ value in the service menu. When the
value exceeds 130 mmHg, connect the other port of the flow cassette to the sample gas
out connector and switch off the pump.
2.
Wait until the pressure inside the sampling system is stabilized, then observe the shown
Amb-Work value. The value, i.e. the pressure inside the sampling system, should not drop
more than 6 mmHg in 20 seconds.
3.
If the pressure drops more, first ensure the connections you have made and repeat the
test.
no response to breathing
•
apnea
•
(disconnection)
•
sampling line or water trap loose or
blocked (air leak)
•
check all connections
•
sample gas outlet blocked
•
check that outlet is open
ETCO
2
over scale >20%
Shown until 32%,
specified range 0...20%
•
abnormally high ETCO
2
(permissive
hypercapnia)
•
CO
2
sensor contaminated
•
D-fend malfunction
•
let the module run without a
sampling line until the CO
2
sensor has dried out
•
change D-fend
ETCO
2
>PaCO
2
•
unit is mmHg or kPa and ETCO
2
is close
to arterial PCO
2
•
“dry gas” as default
•
change to “wet gas” by using
install/service menu
Problem
Cause
What to do
Summary of Contents for b30
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Page 61: ...2 Installation...
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Page 159: ...6 Field replaceable unit...
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Page 183: ...Frame disassembly 6 23 Document no 2044677 001...
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Page 191: ...7 Technical specification...
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