Page 7-24 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
3) Allow the unit to run for 1 minute and record the displayed Vte (average for 8
consecutive breaths).
Then stand the unit upright, allow it to run for 1 minute and record the displayed Vte
(average for 8 consecutive breaths).
• If the difference between the two recorded averages is greater than 100 mL, the
Bypass Valve may be faulty and the following should be performed:
• Check the tubing from the flow valve to the turbine manifold for leaks and replace
if damaged or leaking.
• If the tubing is OK, replace the turbine manifold. See Turbine Manifold in Chapter
8 for instructions.
Transducer Accuracy Checkout
High target pressures and short inspiration times coupled with fast rise times may be beyond
the capacity of the ventilator. For problems with Pressure Support or Pressure Control, first
verify the ventilator is functioning properly.
Check ventilator functionality:
1) Set the ventilator up as follows:
• Attach a test lung with a compliance of 10ml/cmH
2
O and a resistance of 5 cm/L/sec
• Set Rise time - Profile 5
• Set Inspiration Time - 1.0 sec
• Set Sensitivity - OFF
• Set Pressure Control Flow Termination - OFF
2) Set Pressure Control to 50 cmH
2
O and measure the Peak Inspiration Pressure (PIP)
with a calibrated pressure meter.
• If reading is between 46 to 54 cmH
2
O, the unit is functioning properly.
• If reading is less than 46 cmH
2
O or more than 54 cmH
2
O, proceed to the next test.
Check transducer accuracy as follows:
Select the RT XDCR DATA menu and verify the accuracy of the following transducers by
applying the specified pressures to the applicable port or transducer.
• When/as performed, record the readout for each test and refer to the Transducer
Tolerance Variance Table (see page 7-25) for tolerance variance actions to be taken.
AP Pressure Support or Pressure Control:
1) Verify the RISE TIME in VENT OP is set to Profile 5.
2) Apply 50 cmH
2
O to the high side port and verify the AP readout is within ± 0.5 cmH
2
O of
the applied pressure.
3) Disconnect from the ventilator so the connection is open to ambient air. When the
display value stabilizes, verify the AP readout is within ± 0.5 cmH
2
O.
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