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Performance Procedures
Testing the Monitor
4-33
Pump Check
Flow Rate
Check and
Calibration
Note
If the adjusted flow is not stored within 60 seconds of the adjustment, the old flow setting is
restored. If the flow cannot be adjusted to within tolerance, the pump should be replaced. If
the flow adjustment still cannot be made, this indicates a fault in the
CO
2
module, which must
be replaced.
Step Action
1 Connect the flowmeter inlet to the CO
2
module gas outlet.
2 Connect the FilterLine to the CO
2
module inlet.
3 Block the inlet of the FilterLine using your fingertip and observe the cell
pressure to the right of the slash symbol on the top row of the CO
2
Test display
screen.
The cell pressure (X4) should be more than 120 mmHg below the ambient
pressure shown. If the pressure difference is less than 120 mmHg, the pump is
not strong enough and should be replaced (regardless of the Pump Op Time).
Step Action
1 Connect the flowmeter to the CO
2
FilterLine.
2 On the flowmeter, check the flow that the CO
2
Pump draws (X5). The nominal
value is 50; the acceptable limits are 42.5 and 65 ml/minute. If the value is
within these limits, proceed to the CO
2
Gas calibration check. If not within the
limits, calibrate as follows.
3 Select Flow Rate Check and Calibration. Adjust the flow in the monitor by
selecting Increase Flow or Decrease Flow until it is as close as possible to 50
ml per minute as indicated on the flowmeter gauge. The pump voltage displayed
on the second row of the CO
2
Test screen will vary as the flow is changed.
4 When you are satisfied that the flow is set as close as possible to 50 ml per
minute, select Store Flow to confirm the setting