CALIBRATION / OPERATIONAL VERIFICATION PROEDURE
5-4 SERHT50NA A0808
NOTE: If system leak test fails and the leak exists in the pneumatic
system between the manifold and patient circuit, calibration shall be
performed again after the leak is fixed.
PRESSURE TRANSDUCERS CALIBRATION
1. Connect the T-connector between the patient fitting on the
exhalation valve and a test lung. Connect the small bore tubing
from the T-connector to the calibrated pressure gauge.
2. While in the Standby condition, enter USER SETUP by
pressing and holding the Silence/Reset button until the
Message Display Window shows “USER SETUP,” then release
the button.
3. Use the Int. Battery button to scroll to the “Tech. Setup”
message. Use the ▲Up control button to select this parameter.
When the Message Displa
y Window displays “Enter Code…,”
press the ƒ button then the A/CMV button within 5 seconds.
4. The Message Display Window will display “Pressure Cal.”
5. Press the ▲Up control button and the Message Display
Windo
w will display “Apply Zero Pressure.” Make sure that the
calibrated pressure gauge shows zero pressure. If pressure > 0,
remove breathing circuit to relieve pressure.
6. Press the Int. Battery button. The system will start the motor
and will inflate the test lung. The Message Display Window will
show “Pressure = 60.0” (60 is the default value). Adjust the
displayed value in the Message Display Window on the
ventilator using the ▲Up/▼Down control buttons so that it
sho
ws the same value as the calibrated pressure gauge. The
value should be between 40 and 90.
7. Press the Int. Battery button again. After a couple of seconds
you will see two pressure values displayed: P1 = X and P2 = X
(X is the pressure value). After a few seconds the Message
Display Window will show the message “Pressure Cal.” You are
now ready to repeat the calibration.
8. Repeat steps 5 through 7, this time making note of the P1 and
P2 values. These two numerical values should be within 1.5 of
each other. If the difference is within an acceptable range, you
are ready for the next calibration. If they are not, repeat
calibration until the values are within this range.
9. Remove the T-connector and 500 cc test lung.
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