p/n 18603-001, Rev. J
LTV
®
1200, 1150, and 1100 Ventilator Service Manual
Page 7-23
Advanced Diagnostic Procedures
Advanced Vte Diagnostic Procedures
If the ventilator
Monitored Exhaled Volume (Vte)
readout,
Delivered Volume
to the lung,
Target Pressures
or
Inspired Volumes
(LTM only) appear incorrect; perform the following
checkout procedures.
When instructed to replace a subassembly/component that fails any of the following
checkout procedures, verify the original problem is resolved once the
subassembly/component has been replaced. If the original problem is not resolved,
continue through the next Advanced Diagnostic Checkout procedure.
Transducer Null Checkout
Check the null or zero of the transducer for drift as follows:
1) Power up the unit in VENT CHECK mode and select the
XDCR ZERO
menu.
2) Record the figures for the Airway Pressure (AP) and Flow Transducer Wide Channel
(
FDw
) (null figures from the time the unit was last calibrated).
3)
Perform an auto zero
by pressing
Select
. It is considered normal if the figures change
slightly, however;
If the figures for
AP
change by more than 50, the Airway Pressure transducer may
be faulty and the analog PCBA should be replaced. See
Analog Board Assembly
in
Chapter 8 for instructions.
If the figures for
FDw
change by more than 50, the Flow Sensor transducer may be
faulty and the analog PCBA should be replaced. See
Analog Board Assembly
in
Chapter 8 for instructions.
If the figures for
AP
and
FDw
change by less than 20, the unit passes this test and
the Pneumatic System Checkout tests are to be performed.
Pneumatic System Checkout
Check the pneumatic system as follows:
1) Apply 50 cmH
2
O to the high side port, monitor the pressure with a calibrated,
independent pressure meter for 1 minute and record any drop in pressure.
Then apply 50 cmH
2
O to the low side port, monitor the pressure with a calibrated,
independent pressure meter for 1 minute and record any drop in pressure.
If a pressure drop for either the high or the low side port exceeds 1 cmH
2
O, check
all internal plumbing and the solenoid manifold for leaks, replace any damaged
tubing or components and repeat the test.
2) Lay the unit with the front panel up, running in
Volume
mode and set the
Breath Rate
to 12,
Tidal Volume
to 500 ml and
Inspiration Time
to 1.5 seconds. Attach a test lung
with a compliance of 10ml/cmH
2
O and a resistance of 5 cm/L/sec and allow the unit to
warm up for one hour.
Содержание LTV 1100
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