Patent ID: 8284065

Claim:
A microprocessor controlled hazardous condition detection system comprising: a housing containing a sensor package, said sensor package containing sensors said sensors being exposed to an ambient environment and taking periodic readings of predetermined environmental conditions; an alarm means associated with said sensor package and disposed in said housing; a microprocessor electronically coupled to said alarm means and sensor package, said microprocessor having volatile and non-volatile memory, said non-volatile memory having an alarm differential value and a clean air default value stored therein; wherein a default alarm threshold is determined by adding said differential value to said clean air default value; wherein upon system power-up, said default alarm threshold is loaded into said volatile memory; said microprocessor receives periodic readings of predetermined environmental conditions from said sensor package stores said periodic readings in said volatile memory, calculates an average of a plurality of said periodic readings and generates a new alarm threshold by shifting the default alarm threshold loaded into said volatile memory by a value derived from the difference in the calculated average environmental reading and said clean air default value; wherein upon detection of an ambient environmental condition outside of said alarm threshold stored in said volatile memory said microprocessor causes said alarm means to generate an alarm condition.