Patient Monitor User’s manual
13-8
position of wave scale manually, and the waveform amplitude will vary along
with it.
Setting Wave Speed
Select【Wave Speed】in the CO
2
waveform setting menu, and select the
wave speed in the options as required.
13.5 Zeroing
Mainstream CO
2
module and Microstream CO
2
module
Zeroing allows the CO
2
sensor to adjust to the optical characteristics, in
order to obtain accurate readings. While zeroing is recommended the first time
a CO
2
sensor is connected to the monitor, it is only absolutely necessary when
the message“Zero Required”is displayed.
Follow these steps:
1.
Ensure that the nasal cannula or airway adapter is not connected to the
patient or close to any source of CO
2
(including the patient's, your own,
exhaled breath and ventilator exhaust valves).
2.
Select【Zero】in the CO
2
parameter setting menu, this will start zeroing. The
monitor zeroes the sensor and displays the message “Zero In Progress” for
about 15-20s on the screen. The message disappears upon completion of the
zeroing.
Caution:
Always ensure that the sampling tube is properly connected to the
microstream CO
2
sensor before zeroing.
Always ensure that the mainstream CO
2
sensor is properly connected to
the airway adapter before zeroing.
Do not attempt zeroing for 20s after removing the adapter or cannula
from the patient’s airway. This time allows any CO
2
remaining in the
adapter or cannula to dissipate before zeroing.
Do not attempt to zero the sensor while the adapter or cannula is in the
patient’s airway.
Do not attempt zeroing if the temperature is not stable.
Zeroing with CO
2
in the adapter or cannula can lead to inaccurate
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