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10 CO2-O2 Measurement process
LEO allows measurement of the CO2 and O2 concentration in two different modes:
• Diffusion Mode, without pump running. Use Diffusion Mode when the sampling gas has an
overpressure higher than 10 mbarg (0.145 psig).
Note ► Do not exceed 300 mbar (4 psig) upstream of LEO
Note ► LEO can operate at minimum flow rate of 30 ml/min and at maximum flow rate of 400 ml/min.
Tip ► The optimal flow rate of the sampling gas is 150 ml/min.
• Aspiration Mode, with pump running. Use Aspiration Mode when the sampling gas is at
atmospheric pressure.
Tip ► The default value of the gas flow rate sucked by LEO is 150 ml/min. To change this value, see
paragraph 9.3.3.
To start a gas measurement process, press the ON/OFF button and wait until the Warming up time ends.
It will take 15 minutes for CO2-O2-MODULE to achieve stability. During this time, the message “LEO is warming
up” appears (1 in Figure 45).
Figure 45 . LEO is warming up.
CO2 and O2 gas concentration measurement in Diffusion Mode cannot occur
simultaneously with a CO2 – O2
gas concentration measurement in Aspiration Mode.
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