BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 63

IX. MAINTENANCE AND SERVICE- cont.
g. Reinstall and test.
13. FLOW (entrainment off) (perform first - 5, 6, 7, 8, 9)
NOTE: For greatest accuracy, verify flow using a 60% O2 gas supply making certain that the pressure to the
CROSSVENT inlet remains within specified pressure limits (31-75 psi; 303.6 – 517.4 kPa) at all flows.
This may require a supply pressure to the blender to be 70 PSI or greater when checking the higher flows.
Test
Instrument
TO TEST:
a. Connect a patient circuit to the Crossvent as illustrated.
b. Increase the supply pressure to the blender to 75 psi.
c. Turn Max Pressure and PEEP on fully, making certain that the airway pressure tube is connected.
d. Connect the patient hose to an external test instrument capable of measuring flow.
e. After turning ON the CROSSVENT, press the SETUP Key, then CAL MENU and then VALVES.
f. Turn on Valve A.
g. Adjust the flow knob and observe the flow as indicated on the test instrument. It should be within
10% of the displayed flow on the Crossvent where it indicates "FLOW".
h. If not within specification, refer to Troubleshooting in the following section before proceeding to
calibration.
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
i. Press "FLOW" in the CAL menu.
j. Adjust the flow knob until the actual measured flow, as indicated on the test instrument, is equal to
5 lpm. Then compare this actual measured flow to the flow value indicated in the upper portion of
the Crossvent display. If the flow as indicated by the Crossvent is within ±10% of the actual flow,
in this case 4.5 – 5.5 lpm, proceed with the next flow point in the table. If it is not within the 10%
limits, press the "5" key in the table corresponding to the actual flow. The displayed flow on the
Crossvent should now display 5 lpm. The flow knob is now calibrated to the actual flow for that
setting. Repeat for all other flow points.
14. FLOW (entrainment on) (perform first - 5, 6, 7, 8, 9)
NOTE: Verify flow using a 100% O2 gas supply making certain that the pressure to the CROSSVENT
inlet remains within specified pressure limits (31-75 psi; 303.6 – 517.4 kPa) at all flows.
Test
Instrument
TO TEST:
a. Connect a patient circuit to the Crossvent as illustrated.
b. Turn on entrainment using the knob on the side of the ventilator.
c. Turn Max Pressure on fully, making certain that the airway pressure tube is connected.
d. Connect the patient hose from the exhaust of the exhalation valve to an external flow-measuring
device.
e. In the CAL menu, press FLOW to access the Flow Test Menu.
FIG. 12- FLOW TEST SETUP
Plug
Exhalation Valve
w/ Collection Head
FIG. 13- ENTRAINMENT FLOW TEST SETUP
FLOW
MA X PRE SS PE EP FL O W
cmH2O Gauge
80
70 9 0
10 0
6 0
11 0
50 CEN T IMETE RS
OF W AT ER
1 20
4 0
3 0
2 0
1 0 10
0
M A X PR ESS PEEP
To
Blender
3
+
FLOW
3
+
FLOW
57 57
57 57