CareFusion LTV 1200 Service Manual page 103

Flow Valve Accuracy Checkout
Check flow valve accuracy as follows:
1) At the Tidal Volume setting which is giving failing results, press the Tidal Volume
button and VCALC xxx Lpm will be displayed (this is the calculated peak flow for the
set volume). Record this number.
2) Turn the unit off, then on again in VENT MTNCE by holding down the Control Lock,
Manual Breath and Select buttons (3-finger mode
Select VENT MTNCE and perform a STEP TEST.
 If the unit fails the Step Test, replace the flow valve. See Flow Valve Assembly in
Chapter 8 for instructions.
 If the unit passes the Step Test, proceed to the next step.
3) Select SERVO, ON and using a calibrated flow meter, measure the output flow in 10-
liter increments from 10 Lpm to the peak calculated flow.
 To adjust the set flow rate, see Servo in Chapter 6 for instructions.
 If the peak flow is above 50 Lpm, increase the turbine speed to 5000 RPM.
 If the output flow is not within ± 10% of the set flow, the flow valve may be faulty and
should be replaced. See Flow Valve Assembly in Chapter 8 for instructions .
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Using the 3-finger technique enables a modified mode of VENT MTNCE in which testing may be performed,
but Calibration procedures and changing Configuration settings can not.
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LTV 1200, 1150, and 1100 Ventilator Service Manual
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) while turning the ventilator on.
p/n 18603-001, Rev. J