Calibration
CIRAS-2 Operator's Manual Version 2.04
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Max C Determination
The MaxC Function is a diagnostic tool to assess the maximum CO
2
factory settings. It is important that
the CIRAS-2 has been turned on for 20 minutes and that the CO
2
cartridge is full and the chemicals are
fresh. A special T-Piece needs must be fitted to CIRAS-2 prior to starting. Click Utilities – MaxC
Determination – Start, and ensure that the gas connection are correct:
MaxC is divided into 2 parts, firstly with the CO
2
Valve set to 100% (Fully Open) and then with the CO
2
Valve set to 50%. At each stage, CIRAS-2 should be allowed to reach a stable Cr (CO2 Reference)
reading. At this point a Zero should be forced. After the Zero, allow the system to re-stabilize. Valve
Setting and ZERO can be initiated from the Change/Zero button.
When set to 100%, the CO
2
Valve should be silent. At 50%, there should be a regular clicking heard as
the valve opens and closes.
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