VIASYS Vmax Encore, Техническое справочное руководство

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Technical Reference Manual
Vmax Encore
L2707
3–21
Chapter 3 Maintenance and Troubleshooting
6. Select F1 (Shunt) , then inspire and expire using the 3-liter syringe connected to the mass
flow meter inside the cabin. Observe the "Dir" signal on the Test Display. Inspiring generates
a negative voltage; expiring generates a positive voltage. Press
F10 to re-set all valves.
7. Press F6 to turn on the Sample Pump. Allow a 20-minute warm-up period with the cover
installed.
8. Note the "Pb" (box pressure) reading on the screen and adjust the Autobox pressure board
zero pot to 0.00 V dc ±0.010 V dc.
9. Select F1 (Shunt) and O (Transmural) . Using a pressure meter and syringe, inject 4 cm
H2O into the Pb port on the pass through plate in the cabin. Adjust the Autobox pressure
board span pot to 8.0 V dc ±0.05 V dc.
10. Remove the pressure and turn off the “Shunt”.
Repeat steps 8 and 9 until both voltages are within tolerance.
11. Disconnect the green tubing (the negative side) from the ‘Pb’ plenum and pressurize the
negative side of the Pb transducer to 4 cm H
2
O. Pb should read -8.0 V dc ±0.075 V dc. This
pressure should not drop by more than ½ cm H
2
O in one minute.
12. Connect the pressure meter to the Pb port inside the cabin and pressurize to 5 cm H
2
O. This
pressure should not drop by more than ½ cm H
2
O in one minute.
Volume Calibration and Verification Procedure
1. From the main menu, select Flow Sensor Calibration and then F4 (Box Calibration) . Con-
nect the 3-liter syringe to the top port on the outside of the V6200 cabin. Close the door of
the box, and close the leak stopcock by turning it clockwise.
2. Select F6 (Box Leak Time Constant) . Perform the box leak check by fully extending the
syringe piston. The box leak should be 10 to 14 seconds for inspire. Repeat the test with a
full stroke in the opposite direction, and the box leak should be 10 to14 seconds for expire.
If the box-leak time constant is not 10 to 14 seconds, adjust the leak time constant by turning
the stopcock counterclockwise. Repeat the box leak check to obtain a value of 10 to 14 sec-
onds. The difference between inspire and expire is less than two seconds with the stopcock
adjusted.
3. Print the results by selecting F5 .
4. Select F1, Pressure Sensor Calibration . The Vbox correction factor must be 0.875 ±0.100
at 700 to 770 mm Hg for the V6200, 0.725 ±0.083 for the V62J, and 1.181 ±0.135 for the
V62W. The Pm correction factor must be 0.980 to 1.020.
If the Pm correction factor is outside these limits, remove one inch of the red tubing at a
time, from the port on the calibrator shelf plenum and repeat the test until the correction fac-
tor is within limits. You must obtain three successive calibrations that are within limits before
proceeding. Print each test by pressing
F5 .
5. Select F4 (Isothermal Volume Control Verify) . Enter the volume from the IVC into the Iso
Cal Volume box. (See “Lung Volume Standard Calibration” on page 4 ).