Philips 862474, 862478 manual Pump Check, Flow Rate Check Calibration

Performance Procedures

Pump Check

	Step	Action
	1	Connect the flowmeter inlet to the CO2 module gas outlet.
	2	Connect the FilterLine to the CO2 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 CO2 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).
Flow Rate
Check and
Calibration	Step	Action
	1	Connect the flowmeter to the CO2 FilterLine.
	2	On the flowmeter, check the flow that the CO2 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 CO2 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 CO2 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

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 CO2 module, which must be replaced.

Testing the Monitor 4-33