3 Testing and Maintenance Tests
40
5
Block the measurement server extension outlet using your fingertip and observe the flowmeter
display. The value on the flowmeter (x2) should decrease to between 0 and 4 ml/min,
accompanied by an audible increase in pump noise. If the value is within the tolerance limits,
continue with part 2 of the leakage check.
6 If the value is outside the tolerance limits, there is a leakage between the pump outlet and the
measurement server extension gas outlet.
7 Open the measurement server extension and check the tubing connections at the pump outlet and
the extension gas outlet. If the connections are good, then there is a leakage in the tubing and you
must exchange the measurement server extension.
Part 2
1 Disconnect the flowmeter from the Part 1 setup and connect the flowmeter inlet to the M3015A
gas outlet.
2 Leave the Filterline connected to the M3015A 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/min, accompanied by an audible
increase in pump noise. Do not block the inlet for longer than 25 seconds as this will lead to an
“Occlusion” INOP. If the value is within the tolerance limits, there are no leakages and the leakage
check is completed; 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 M3015A to check the tubing connections at the
pump inlet and the M3015A 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
M3015A must be exchanged.
Pump Check
1 Connect the flowmeter inlet to the M3015A gas outlet.
2 Connect the FilterLine to the M3015A inlet.
3 Block the inlet of the FilterLine using your fingertip and observe the cell pressure on the M3046A
display. 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 you
should replace it, irrespective of the Pump OpTime.
Flow Rate Check and Calibration
Check the flow rate in the sidestream CO
2
extension as follows:
1 Connect the flowmeter to the CO
2
FilterLine.
2 Check on the flowmeter the flow that the sidestream CO
2
extension pump draws (x5). It should be
50 ml/min ± 7.5 ml/min. If the value is within tolerance, proceed to the CO
2
Gas calibration
check. If the value is not within tolerance, calibrate as follows.
3 Adjust the flow in the instrument 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.
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