Philips 862478 - Manual (Page 82)

Performance Procedures
4-32 Testing the Monitor
Leakage
Check
The Leakage Check consists of two parts:
• Part 1 - Checking the tubing between the pump outlet and the CO
2
module outlet.
• Part 2 - Checking the tubing between the pump inlet and the FilterLine inlet.
Note
Check the flowmeter’s user guide for details on how to make a correct flow reading.
Part 1
Part 2
Step Action
1 Check the ambient and cell pressure shown in the status line on the screen. The
cell pressure should be approximately 20 mmHg (2.7 kPa) lower than the
ambient pressure.
2 Connect the flowmeter outlet to the FilterLine inlet using a flexible connecting
tube.
3 Block the CO
2
module outlet using your fingertip and observe the flowmeter
display. The value on the flowmeter (X2) should decrease to between 0 and 4 ml/
minute. If the value is not within the tolerance limits, there is a leakage between
the pump outlet and the CO
2
module gas outlet.
4 If a leakage is found in Step 3, open the CO
2
module and check the tubing
connections at the pump outlet and the module CO
2
gas outlet. If the connections
are good, then there is leakage in the module and the CO
2
module must be
exchanged.
Step Action
1 Disconnect the flowmeter from the Part 1 setup and connect the flowmeter inlet
to the CO
2
module gas outlet.
2 Leave the FilterLine connected to the CO
2
module inlet.
3 Block the inlet of the FilterLine using your fingertip and observe the flowmeter
display. The value on the flowmeter (X3) should decrease to between 0 and 4 ml/
minute. If the value is within the tolerance limits, there are no leakages and the
leakage check is completed. You can proceed to the “Pump Check”.
4 If the value is not within the tolerance limits, there is a leakage between the
FilterLine inlet and the pump inlet.
5 Check the FilterLine connections and open the monitor to check the tubing
connections at the pump inlet and the CO
2
module gas inlet. If the connections
are good, try replacing the FilterLine and repeating the leakage check. If the
situation remains, there is a leakage in the tubing and the CO
2
module must be
exchanged.