8 CO2 measurement (optional)
Use only T adapters whose sample collection point is located in the middle of the
adapter (see figure).
8.2.5 Running zero calibration
For correct zero calibration, the CO
2
analyzer MUST contain room air (0% CO
2
). For
this reason, it is particularly important to place the CO
2
analyzer in a well ventilated
area and not to breathe in the vicinity of the analyzer before and during zero
calibration.
The ISA™-CO
2
runs zero calibration automatically. For this purpose, gas
sample collection switches from ventilation system to ambient air.
Automatic zero calibration is performed every 24 hours and takes less
than 3 s.
8.2.6 Status indicator of the analysis adapter
The status indicator of the ISA™ probe indicates the following operating
states:
Check sample collection tube
Tab. 43: Status indicator
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