BIRD MARK 7 - Controlled Expiratory Time Calibration and Troubleshooting

CALIBRATION
AND
TROUBLESHOOTING
SECTION
7:
CALIBRATION AND TROUBLESHOOTING
5.0 PRESSURE-CYCLED LIMIT CONTROL
5.1 Mark 7
Rotate INSPIRATORY FLOWRATE control full
clockwise.
Mark 7A
Rotate INSPIRATORY FLOWRATE control full
clockwise and insure PRESSURE/TIME-CYCLED
SELECTOR SWITCH is “OUT”.
5.2 insert test lung onto breathing assembly.
5.3 Loosen both setscrews on the pressure con-
trol arm with a %2" allen wrench, but do not
remove the indicator arm.
5.4 Push “in” hand timer rod to cycle the unit
“ON” and rotate the end of the pressure magnet
shaft with a screwdriver until the unit cycles
“OFF” (hand timer rod moves “OUT”) at 20
cmH,0.
5.5 Secure the position of the magnet shaft with
the screwdriver while rotating the selector arm
until it points at number 20 on the pressure
compartment.
5.6 Position the selector arm approximately Ye”
from the outside end of the shaft and tighten
equally the two setscrews to secure.
5.7 Cycle respirator “ON” and note pressure
limit on manometer. Adjust if this varies from
20cmH,0.
5.8 Troubleshooting PRESSURE CYCLE
control.
PROBLEM POTENTIAL CAUSE
CORRECTIVE ACTION
Will not cycie “OFF” at
20cmH,0 with selector
arm at 20.
1. Reguires calibration.
2. Leak in breathing assembly or
gas escaping from pressure
1. Calibrate per Steps 5.1-5.7.
2. Check each possibility and
correct.
compartment or pressure relief
valve venting at a pressure less
than 20cmH,0.
6.0 STARTING EFFORT (SENSITIVITY)
6.1 Remove P/N 0409, Test Lung, from breathing
assembly and insert a mouthpiece.
6.2 Loosen both setscrews of sensitivity control
arm with $2" allen wrench, but do not remove
indicator arm.
6.3 Adjust the magnet in the ambient compart-
ment with Sensitivity Adjustment Tool (P/N 5497)
until a slow and gentle inspiratory effort cycles
the unit “ON” at —2cmH,0 as indicated on the
manometer.
6.4 Stabilize the sensitivity magnet with the
adjustment tool and carefully align the selector
arm to the number 20 on the ambient
compartment.
6.5 Position this selector arm so that it is flush
with the end of the magnet shaft and tighten
equally the two setscrews to secure arm to shaft.
6.6 Recheck for a ~2cmH,0 with a gentle
inspiratory effort.
6.7 Troubleshooting STARTING EFFORT.
PROBLEM POTENTIAL CAUSE CORRECTIVE ACTION
Respirator cycles “ON” at 1, Requires calibration. 1. Calibrate per Steps 6.1-6.6.
a sub-ambient pressure 2. Leak in breathing assembly. 2. Correct.
other than —2cmH,0 with
selector arm set at 20.
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