Page 6-12 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
6) Connect the male Luer fitting from the calibration syringe assembly to the high pressure
female Luer fitting on the side of the ventilator. Decrease and maintain the vacuum until
a value in the range of 10 to 150 is displayed in the Tidal Volume window. Adding a
large amount of compliance, such as a test lung, to the calibration syringe assembly, will
significantly stabilize the readings during this step.
If a pressure meter is attached to the circuit, you will see a vacuum of approximately -2.5
mm H
2
0 displayed when you are at this setting. During this step, any value in the range
of 10 to 150 displayed in the Tidal Volume window is equally acceptable, but it is crucial
that the value displayed in the Tidal Volume window is stable when pressing Select.
Alternatively, it is also acceptable to apply a small positive pressure to the ventilator low
pressure fitting to fulfill this step.
Record the number that was displayed in the Tidal Volume window, and the number
that was displayed in the High Pres. Limit / Low Pressure windows when you pressed
Select on the Calibration Worksheet.
FD 0
C
M
H
2
O is displayed.
7) Disconnect from the ventilator so the connection is open to ambient room air. Observe
the numbers displayed in the Tidal Volume setting window. When the displayed value is
stable, press Select.
Record that value on the Calibration Worksheet.
FD 4015 ± 70 AD is displayed.
8) Connect the male Luer fitting from the Calibration Syringe assembly to the high pressure
female Luer fitting. Increase and maintain the pressure until a value of 3945 to 4085 is
displayed in the Tidal Volume window. Adding a large amount of compliance, such as a
test lung to the calibration syringe assembly, will significantly stabilize the readings
during this step.
If a pressure meter is attached to the circuit, you will see a pressure of approx +3.0 mm
H
2
0 displayed when you are at this setting. During this step, any value in the range of
3945 to 4085 displayed in the Tidal Volume window is equally acceptable, but it is
crucial that the value displayed in the Tidal Volume window is stable when pressing
Select.
Record the number that was displayed in the Tidal Volume window, and the number
that was displayed in the High Pres. Limit / Low Pressure windows when you pressed
Select on the Calibration Worksheet.
FD 0
C
M
H
2
O is displayed
9) Disconnect from the ventilator so the connection is open to ambient room air. Observe
the numbers displayed in the Tidal Volume setting window. When the displayed value is
stable, press Select.
Record that value on the Calibration Worksheet.
VALVE DIFF is displayed if the calibration was successful.
If CAL FAIL
appears at any time, press Select to exit the calibration. When FLOW DIFF is
displayed, press Select and perform the calibration again.
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