GE b30, Technical Reference Manual

Page: 225 / 252

N-FCREC Module disassembly and reassembly
8-25
Document no. 2044677-001
5.1.4 Flow rate adjustment
NOTE: Before adjusting the sampling flow, make sure there is no leakage in the sampling
system.
Refer to chapter
3.2 Service check, step 13. Gas calibration .
Wait until the Sample Flow value is back to near 150 ml/min.
Connect a flow meter to the 3 meter sampling line and check that the flow (the flow meter
reading) is within the following range:
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.
5.1.5 Gas calibration
Gas calibration is performed in the Airway Gas menu.
Calibration gas regulator flow check
Interval: every 12 months
Regulator flow specification:
REF 755533 & 755534: 260 – 410 ml/min at 1-10 bar cylinder pressure
REF 755530: 260 – 410ml/min at 5-7psi cylinder pressure
Tools needed: calibration gas can, regulator, piece of silicon hose and flow meter. GE
Healthcare recommends use of TSI 4140 Flow Meter.
Insert the calibration gas regulator on the gas cylinder. Connect a silicon hose between the
regulator and the flow meter. Block the regulator overflow port and open the regulator. Check
the flow rate from the flow meter and verify that the flow is within the specification.