LTV 1150 - Page 275

p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 9-19
7) Perform a Patient Outlet Pressure test. Enter the SERVO menu.
Calculate Actual Turbine Speed (T/S)
A) With the ventilator operating in Servo Mode, set step position (listed under
Tidal Volume) to 500, and O
2
% to 21% (Oxygen setting for LTV
®
1200 only).
B) Check the measured turbine speed (T/S) value noted during the turbine speed
calibration test in Chapter 6.
C) If the measured T/S is less than 4000 RPM, then subtract it from 4000 to
determine the adjustment which needs to be made to the set turbine speed.
Add this adjustment value to 4000 to determine the actual turbine speed
setting for this test. Note this actual T/S value.
D) If the measured T/S value is greater than 4000 RPM, subtract 4000 from it to
determine the turbine speed adjustment value. Subtract this adjustment value
from 4000 to determine turbine speed setting for this test. Note this actual
turbine speed value.
Example
: If the measured T/S value is 3750, the adjustment value is +250
and the actual turbine speed setting should be 4250.
If the measured T/S value is 4250, the adjustment value is -250
and the actual turbine speed setting should be 3750.
Measure Patient Outlet Pressure at Actual Turbine Speed (T/S)
E) Press High Pres. Limit and rotate the Set Value knob to display the actual
turbine speed value obtained above.
F) Set up the ventilator as follows:
• Connect a 22mm adapter (P/N 10570) to the patient outlet port of the
ventilator.
• Connect a hose from the 22mm adapter to a test hose connected to a
manometer.
• Using pinch clamps (P/N 11529), block any other hoses branching
from the test hose.
G) Wait for the manometer to reach a stable
value (usually about one minute) before
taking a reading.
• Pressure must be ≥ 55
cmH
2
O at actual T/S
H) Record the pressure and the actual T/S values on the Performance Checkout
Worksheet. Remove the 22mm adapter from the ventilator.
I) If the outlet pressure value is less than this value, troubleshoot (see Chapter 7
- Troubleshooting). For assistance, call Pulmonetic Systems technical support
using the contact information at the front of this manual.