CareFusion LTV 1200 Service Manual page 97

Symptoms
Ventilator is auto
.
cycling
Sensitivity does not
appear to be accurate.
Page 7-20
Possible Causes
Circuit leak.
High or low side sense line
or elbow at patient wye
loose or leaking.
High or low sense lines are
occluded.
High or low sense ports in
the wye are occluded.
Pressure Control or
Pressure Support set below
PEEP
Failed auto zero.
Bypass flexible tube
pinched.
Pinhole leaks in bypass
flexible tube.
Failed calibration.
®
LTV 1200, 1150, and 1100 Ventilator Service Manual
What to Do
Verify the sensitivity is set to an
appropriate value. For a high leak
environment, the sensitivity may need to
be set higher to prevent auto cycling.
Check for and correct airway circuit leaks.
Make sure all circuit accessories are
properly connected.
Check high and low pressure sense lines
to be sure they are correctly attached and
securely seated at both the ventilator and
wye ends.
Check the Luer fitting connections for
leaks.
Check the elbow connectors at the wye to
be sure they are not loose or broken.
Verify lines are not occluded or pinched.
Check the exhalation drive line at both the
ventilator and exhalation valve ends.
Verify the line is securely seated and not
leaking.
Verify the control values are appropriately
set.
Perform an auto zero under XDCR ZERO.
®
See the LTV 1200, 1150, or 1100
Ventilator Operator's Manual for more
information.
If the bypass flexible tube is pinched, it
can usually be seen pressed against the
louver openings in the bottom of the
ventilator case.
Open the ventilator and remove the back
panel. Replace the back panel being sure
to fit the louvers in between the upper and
lower loop of the bypass flexible tube
before seating the back cover.
If the bypass flexible tube is leaking,
replace it.
Recalibrate the vent. See Chapter 6 -
Maintenance & Calibration for instructions.
If the problem reoccurs after careful
recalibration, a transducer may be drifting
excessively. Perform the Advanced Vte
Diagnostic Procedures, see page 7-23.
p/n 18603-001, Rev. J