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4
Monitoring
4.10 CO2 mainstream
Page 66
A
rt.
no.
: 0-48-
0227
Rev.:
g
DEFIGARD/PHYSIOGARD Touch 7
4.10.5
Zeroing of the IRMA CO
2
sensor
Zeroing intervals for
CO2 IRMA sensor
• When the message
“CO2 calibration is required”
is displayed
• When an offset in gas readings is discovered (0-offset)
Zeroing procedure
1. Snap a new airway adapter onto the sensor without connecting the airway adapt-
er to the breathing circuit.
2. After start-up or changing of the adapter, wait for at least 10 seconds until the
sensor has reached its operating temperature.
3. In the "etCO
2
settings" menu, select the menu item “
Perform zeroing”.
4. Carry out the
zeroing
by pressing the parameter “
Perform zeroing”
in the "et-
CO
2
settings" menu.
Make sure that no exhaled air enters the airway adapter.
The green LED on the probe will be blinking for approximately 5 seconds while
zeroing is in progress.
5. If the message
“CO2 calibration is required”
is again displayed, perform the
zeroing again.
6. If the message
“CO2 calibration is required”
is no longer displayed, the zero-
ing has been performed.
7. Reconnect the airway adapter with the sensor to the breathing circuit.
8. Check the CO
2
curve on the display to see if the connections are correct and if
the CO
2
value is in the expected range. The curve rises during expiration.
An incorrect zeroing leads to wrong measurement results.
Therefore, make sure that the IRMA adapter is filled with ambient air (21% O2
and 0% CO2) during the zeroing.
After start-up or changing of the adapter, wait for at least 10 seconds until the
sensor has reached its operating temperature.
During zeroing, no breathing air must enter the adapter.