BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 59

IX. MAINTENANCE AND SERVICE- cont.
The steps in these procedures are divided into two parts. The first part is "TO TEST". This describes the
procedure used to test each specific component of the unit to determine its condition. The second part is
"TO CALIBRATE". This part describes the calibration procedure of that component if it did not pass the
preceding test.
IMPORTANT: The calibration steps need only be performed on those components that fail the "TO
TEST" procedure. Generally, calibration is only required when parts are serviced or replaced so be
sure to troubleshoot any failed test thoroughly prior to resorting to calibration.
CAUTION: With the PC Board removed, great care should be taken to protect the board
from stray voltages, static electricity, and any other environmental concerns that may
damage the board. Always handle the board with care and be sure you and your work
surface are properly grounded.
1. GAS SOURCE - 60% O2 / 100% O2
a. To ensure the most accurate calibration throughout all settings on the CROSSVENT, a blended gas
source of 60% O2 should be used.
b. 100% O2 should be used when entrainment is on, if installed.
2. SUPPLY PRESSURE - 31 - 75 PSI (303.6 – 517.4 kPa)
a. The pressure at the supply input on the CROSSVENT (not at the supply source) must be
maintained between 31 - 75 PSI (303.6 – 517.4 kPa) at all times.
3. PEEP VALVE ZERO - ≤20 ML/M
TO TEST:
a. Connect the exhalation valve port on the side of the CROSSVENT to a low flow test instrument.
b. Using hemostats or a similar tool, clamp off the blue PEEP tube between the small tee fitting and
the white bleed manifold mounted to the side of the case. Also clamp off the orange tube between
the PEEP Variable Resistor (131) and the bleed manifold.
c. Turn the PEEP Valve (18) shaft fully CCW until a flow ≤20 ML/M is obtained as observed on the
test instrument (Slight resistance in the valve at this point is normal, however, do not force the
valve. If abnormal resistance is felt prior to the valve closing to within this specification, it should
be replaced.)
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
d. Clamp off the blue PEEP tube between the small tee fitting and the white bleed manifold mounted
to the side of the case. Also clamp off the orange tube between the PEEP Variable Resistor (131)
and the bleed manifold.
e. Remove the shaft extender from the valve shaft by loosening the two setscrews. Turn the valve shaft
until the specification stated above (3c) is met. Position the shaft extender on the PEEP Valve
shaft with its stop pin against the left side of the stop. Tighten the setscrews in this position.
f. Remove hemostats.
4. MAXIMUM PRESSURE VALVE ZERO - ≤20 ML/M
TO TEST:
a. Connect the exhalation valve port on the side of the Crossvent to a low flow test instrument.
b. Using hemostats or similar tool, clip off the yellow tube coming off the side of the DARV.
CAUTION: Failure to do this could result in damage to the ventilator in the steps that follow.
c. Using hemostats or a similar tool, clamp off the orange tube between the DARV Variable Resistor
(130) and the white bleed manifold mounted to the side of the case. Also clamp off the orange tube
between the MAX Pressure Variable Resistor (130) and the bleed manifold.
d. In the CAL menu, activate valves, and turn on valve B.
e. Turn the MAX Valve (22) shaft fully CCW until a flow ≤20 ML/M is obtained as observed on the
test instrument. (Slight resistance in the valve at this point is normal, however, do not force the
valve. If abnormal resistance is felt prior to the valve closing to within this specification, it should
be replaced.)
f. Remove the clamps from the orange bleed tubes before removing the clamp from the yellow tube to
the DARV.
IF IT FAILS THE ABOVE TEST, CALIBRATE AS FOLLOWS:
g. Remove the DARV orange test plug from the cross next to the DARV Variable Resistor (130) and
connect this barb to a low flow test instrument.
h. Clamp off the orange tube between the DARV Variable Resistor and the white bleed manifold as
well as the orange tube between the MAX Pressure Variable Resistor and the bleed manifold.
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