GE B30 Technical Reference Manual page 230

B30 Patient Monitor
Problem
'REPLACE D-FEND' message
'SAMPLE LINE BLOCKED' message Amb – Work pressure difference too big.
No response to any gas
Sudden increase in gas display
Abnormally high (or abnormally
low response to CO
2
or sudden occlusion warning
Strong drift in all gases
7.2.1 CO measurement
2
Problem
Action
too low ETCO value
2
too high ETCO
2
waveform clipped
8-30
.
Document no 2044677-001
Cause/What to do
Amb – Work pressure difference too big.
Indicates residue build-up on the water trap membrane. This decreases
air flow. Replace the D-fend.
Sampling line or water trap is occluded. Water trap container is full. If
occlusion persists, check internal tubing for blockages.
Check Sample Gas Out.
Amb - Work pressure low, flow too small and pump voltage too high.
Sampling line, water trap, or internal tubing is blocked or loose, or
improperly attached. Gas out connector or tubing is blocked.
Zero valve malfunction. Pump failure or pump is worn. Supply voltage
missing. Serial communication error.
Water trap malfunction. Check all internal tubing and the interior of the
water trap for occlusions or leaks. Replace water trap. Check flow rates.
Pressure transducer failure. Check the Ambient and Amb – Work
pressures in Gases service menu.
Leak in sampling line or internal tubing (especially in conjunction with too
low readings).
Cause
•
sudden decrease in circulation
•
pulmonary embolism
•
hyperventilation
•
very large dead-space
•
large shunting
•
leak in sampling system
•
calibration error
•
high by-pass flow from ventilator
•
hypoventilation
•
increased metabolism
•
D-fend contaminated
•
calibration error
•
incorrect scaling
What to do
•
check all connections
•
check calibration
•
change D-fend
•
check calibration
•
change scale