BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 62

IX. MAINTENANCE AND SERVICE- cont.
9. DARV SIGNAL - 65 cmH
TO TEST:
a. Remove the orange test plug from the cross next to the DARV Variable Resistor (130). Connect
this barb to a low pressure test instrument.
b. Fully open the Max Pressure Valve.
c. In the CAL menu, activate valves and turn on valve A.
d. Set the flow to 40 LPM (if the flows are not calibrated, then set this using a test instrument)
e. Pressure should be 5 cmH
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
f. Set up as in 9a - d.
g. Adjust DARV Variable Resistor to obtain 9e.
10. FLUSH - 50 ML/M
(Units with exhale tidal volume monitoring installed only)
TO TEST:
a. Using a length of tubing, connect the lower orifice of the Flow Sensor jack on the side of the
Crossvent to a low flow test standard and turn on the Crossvent.
b. Press SETUP and then CAL MENU. Activate VALVES.
c. Turn ON valves A, D1 and D3, and set a flow of 40 LPM (if the flows are not calibrated, then set
this using a test instrument).
d. Check for a flow of 40- 60 ml/min coming from the orifice.
e. Move the tubing connection from the lower orifice to the upper orifice in the Flow Sensor jack and
check for the same flow.
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
f. Set up as in 11a - c.
g. Adjust the Distal Variable Resistor (132) to obtain 11d.
h. Adjust the Proximal Flush Variable Resistor (132) to obtain 11d.
11. POSITIVE RELIEF VALVE - 96 - 144 cmH
TO TEST:
a. Connect the Patient Connector on the side of the CROSSVENT to a low pressure test instrument
using a single length of tubing.
b. Occlude the opening of the DARV.
c. In the CAL menu, activate valves, and turn on valve A.
d. Starting with the valve fully CCW, turn the Flow Knob fully CW while observing the test
instrument. The pressure should be no less than 96 cmH
cmH O with ≤120 LPM.
2
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
e. Set up the same as 10a - c.
f. Turn off valve A and remove the Positive Relief Valve (128).
g. From the underside of the valve, adjust the tension on the spring to obtain 12d by holding the
spoked spring seat and turning the center poppet with a screwdriver. Turn CW if pressure is too
high and CCW if too low.
h. Reinstall and test.
12. VACUUM RELIEF VALVE - - 4 cmH
TO TEST:
a. Connect the Patient Connector on the side of the CROSSVENT to a low flow test instrument using
a single length of tubing. Into this tube, tee a low pressure vacuum test gauge.
b. Occlude the opening of the DARV.
c. Connect a controlled vacuum generating device to the output of the low flow test instrument so that
air can be drawn through it.
d. Slowly increase the vacuum while observing the flow test instrument and the vacuum gauge. The
Vacuum Relief Valve (123) should start to open between -3.5 and -4.5 cmH
instrument should indicate this by showing some flow at this point.
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
e. Set up the same as in 11a - c.
f. Remove the Vacuum Relief Valve (123). While holding the poppet from turning with your finger,
adjust the tension on the spring by turning the spoked spring seat. Turn it CW to increase and
CCW to decrease pressure.
O (perform first - 5, 6)
2
O above MAX Pressure as measured in Step 8.
2
(perform first - 5, 6)
O
2
O (perform first - 5, 6)
2
O with ≥20 LPM and no greater than 144
2
(perform first - 5, 6)
O and the flow test
2
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