A humidification system is provided for a respiratory system is provided with a controller having two processors that monitor the operation of each other and of heating elements in the respiratory system to provide CPU redundancy and heating element control. The CO2 absorber bypass further includes a shunt for conveying the diverted exhaled gas, a coupler for connecting the shunt to the inhalation limb of the anesthesia machine, a shunt one way valve, a shunt adjustable pressure limiting valve, and a shunt reservoir. A digital signal is generated which corresponds to the location of the highest of these signal amplitudes which exceeds the noise floor threshold. Semiconductor material is formed on the insulative material. The caching logic includes a storage unit.