190
5.25 Gas Exhaust (5)
The exhaust from the gas analyzer is normally connected to the exhaust of the
system and is collected by the AGSS. This setup is referred to as atmosphere.
In very low fl ow applications, it is often necessary to return the sample gas to
the breathing system to prevent the bellows from slowly collapsing.
It is important that the ventilator knows where the return point is, so that it
can make the correct compliance correction. The instructions to follow vary,
depending on which option is selected here.
If the return is to atmosphere/AGSS, the user will be told to remove the sample
line before pre use test.
If the return is to the breathing circuit, the user will be told to ensure the analyzer
is switched on and that the sample line is connected.
5.26 Enable Pre-use Test (6)
For most users, this option will be enabled. This option will request that the user
performs the pre-use test.
On some models or for some installations, this option can be turned off by
selecting disable and then setting a fi xed compliance correction. The value
of this compliance correction should be selected to give a good approximation
of a ‘normal set-up,’ i.e., measure the system with a normal absorber full of
soda lime and the most frequently used breathing system in place. Look at
the measured system compliance displayed on the main screen. Then set this
value for the disabled value.
5.27 Touch Calibration (7)
A small red square is displayed at the top left of the Touch Calibration screen.
Touch this square as accurately as possible with your fi nger. Once touched,
another red square will be displayed to the right and lower than the fi rst square.
Again touch this square as accurately as possible. Repeat this sequence until
the tenth square is displayed at the very bottom right.
Next, four boxes are displayed as a confi rmation screen. Touch each of the
four boxes as near to the centre as possible. When an acceptable reading is
obtained, the box will show ‘DONE.’ When all four boxes are ‘DONE,’ the screen
will be calibrated and will display ‘passed’.
Detailed Repair Procedures
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