Patent ID: 7487664

Claim:
A system for sensing a wide range of water vapor levels in an atmosphere comprising: a first sensor for measuring high levels of water vapor in an atmosphere in a range between a first low limit and a first high limit, and for providing a first output signal, a second sensor for measuring low levels of water vapor in an atmosphere in a range between a second low limit and a second high limit, and for providing a second output signal, a first flow path for directing an atmosphere through said first and second sensors, a second flow path for directing the atmosphere through said first sensor and bypassing said second sensor, at least two three way valves jointly operable to direct said atmosphere through either said first flow path or said second flow path, a control device for receiving said first and second output signals from said first and said second sensors, and providing an output for controlling said at least two three way valves and an indication of the water vapor level of the atmosphere.