Leakage check, Leakage check -32 – Philips 862478 User 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.