| http://www.w3.org/ns/prov#value | - The time constants (charging and discharging) of these circuit components are such that the D.C. voltage across the capacitor 47 represents the mean O2 level sensed by the sensor 20 (FIGS. 1, 2A and 2B) over a relatively long period, for example during the preceding fifteen (15) minutes or even longer for example a number of hours) or shorter (for example one hundred twenty (120) seconds being sui
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