16-8 Passport 12/Passport 8 Operator’s Manual
16.7 Measurement Limitations
Some adverse effects can influence the CO
2
performance.
CAUTION
The following factors may influence the accuracy of measurement:
Leaks or internal venting of sampled gas
Mechanical shock
Cyclic pressure up to 10 kPa (100 cmH
2
O)
Other sources of interference, if any
Measurement accuracy may be affected by the breath rate and I/E ratio as follow:
etCO
2
is within specification for breath rate ≤ 60 bpm and I/E ratio ≤ 1:1;
etCO
2
is within specification for breath rate ≤ 30 bpm and I/E ratio ≤ 2:1.
Measurement accuracy is unspecified for breath rate larger than 60 bpm.
16.8 Leakage test
When the sidestream CO
2
module needs maintenance, the monitor displays the message in the CO
2
waveform window:
[Need maintenance. Enter CO2 setup menu.] Then:
1. Select [Main Menu]→[Maintenance >>]→[User Maintenance >>]→enter the required password→[Maintain
CO2 >>].
2. Perform leakage test according to the prompt messages on the menu.
16.9 Troubleshooting the Sidestream CO
2
Sampling System
When the sampling system of the sidestream CO
2
module does not work correctly, check to see if the sampling line is
kinked. If the sampling line is not kinked, remove it from the watertrap. If the monitor gives a message indicating the
sampling system still does not work correctly, it indicates that the watertrap is blocked and should be replaced with a
new one. Otherwise, the sampling line is blocked and should be replaced with a new one.
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