BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 61

IX. MAINTENANCE AND SERVICE- cont.
r. When the preceding steps have been completed, the gear(s)
should appear as above. The potentiometer gear should be
positioned on the shaft so that its front face is forward of
the flow gear(s) by half its thickness. This enables proper
engagement throughout the full travel of the flow shaft(s).
As they turn, the gears on the flow shaft(s) will move
forward such that when they are at the end of their rotation
and are in the fully open position, they will be beyond the potentiometer gear by half its thickness.
6. LOGIC REGULATOR - APPROX. 19/26 PSI (perform first - 5)
REMINDER: Supply should be 60% O2 (100% O2 with entrainment on, if installed).
TO TEST:
a. Connect the Patient Connector on the side of the CROSSVENT to a high flow test instrument using
a single length of tubing.
b. Occlude the opening of the DARV or turn up MAX Pressure if it's calibrated.
c. In the CAL menu, activate valves, and turn on valve A.
d. Turn the Flow Valve fully CW. The maximum flow should be within 108 - 132 LPM (102 - 138
LPM with entrainment on, if installed).
e. If this test fails, refer to Troubleshooting in the following section before proceeding to calibration.
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
f. Remove the locking o-ring between the red locking ring and the Regulator Adjusting Knob and lift
the ring towards the knob to unlock it.
g. Remove the orange test plug from the tee located on one of the four clear tubes just off the
regulator and connect a high pressure gauge here.
h. Connect the Patient Connector on the side of the CROSSVENT to a high flow test instrument using
a single length of tubing.
i. Occlude the opening of the DARV or turn up MAX Pressure if it's calibrated.
j. In the CAL menu, activate valves, and turn on valve A.
k. Turn the Flow Valve fully CW. (Entrainment off, if installed).
l. Turn the Regulator Adjusting Knob until the specification stated above (6d) is met. The pressure as
indicated on the gauge (6g) should be approximately 19 PSI (26 PSI if the CROSSVENT has the
entrainment option installed). This pressure will vary slightly from unit to unit and is dependent
upon the pressure required to obtain the maximum flow, therefore no specific pressure is given.
However, if the pressure required is significantly higher or lower than these values, then there may
be a problem, i.e. restriction, leak, etc.
m. Remove the test gauge and replace the test plug. Snap the locking ring back down in place and
replace the o-ring.
7. PEEP SIGNAL - 17 cmH
TO TEST:
a. Connect the exhalation valve port on the side of the CROSSVENT to a low pressure test
instrument.
b. Fully open the PEEP Valve.
c. Pressure should be 15 - 20 cmH
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
d. Set up as in 7a-b.
e. Adjust the PEEP Variable Resistor (131) to obtain 7c.
8. MAXIMUM PRESSURE SIGNAL - 60 cmH
TO TEST:
a. Connect the exhalation valve port on the side of the CROSSVENT to a low pressure test
instrument.
b. In the CAL menu, activate valves and turn on valves A and B.
c. Set the flow to 40 LPM (if the flows are not calibrated, then set this using a test instrument).
d. Fully open the MAX Pressure Valve.
e. Pressure should be 54 - 66 cmH
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
f. Set up as in 8a - d.
g. Adjust the MAX Pressure Variable Resistor (130) to obtain 8e.
O (perform first - 3, 5, 6)
2
O.
2
O (perform first - 4, 5, 6)
2
O.
2
Fig. 11- Gears with Valves Closed
55 55
55 55