GE b30, Technical Reference Manual

Page: 215 / 252

Service procedures
8-15
Document no. 2044677-001
Sampling flow (ml/min) 135...165
If necessary, readjust the sampling flow:
Select
Sample gain adj from the menu.
To increase the sampling flow, turn the ComWheel counterclockwise. To decrease the
flow, turn the ComWheel clockwise.
A change of 0.050 in the Gain value changes the flow approximately 7.5 ml/min.
After you have changed the gain, wait until the Sample Flow value on the screen returns
near to the original, then check the flow meter reading again.
"
12. Working pressure
Check that the Amb-Work value in the service menu is within the following range:
Amb-Work (mmHg)
20...50
"
13. Gas calibration
Airway Gas
- Gas Calibration
NOTE: The calibration should not be performed before 30 minutes warm-up time.
Use calibration gas 755580 (5% CO
2
, about 20% O
2
) for calibrating the module with CO
2
measurement.
"
14. Occlusion detection
Block the tip of the sampling line with your finger and check that the message ‘Sample
line blocked’ appears on the monitor screen within 60 seconds.
"
15. Check D-fend
Detach the mini D-fend and check that the message ‘Check D-fend’ appears on the
monitor screen within 30 seconds.
"
16. Apnea detection
Reattach the mini D-fend. Simulate at least 5 breaths by feeding calibration gas into the
sampling line. Check that the shown gas information is correct.
Check that the monitor shows the message ‘Apnea’ within 30 seconds after you have
stopped feeding the gas.
"