Patent ID: 7996159

Claim:
A system for sensing gases, the system comprising: a gas detector comprising at least one light emitter and at least one light detector configured to detect light at wavelengths spanning a target gas absorption spectrum in a volume of gas-air mixture; a processor circuit and a data storage device in communication with the gas detector, the processor circuit and data storage device effective for determining an amount of target gas in the volume of gas-air mixture and a lower explosive limit level for at least one target gas in the volume of gas-air mixture; wherein the processor circuit is configured to receive data representative of temperature of the volume of gas-air mixture and adjusts the lower explosive limit level according to a function of at least the data representative of temperature of the volume of gas-air mixture; wherein the processor circuit is configured to receive data representative of humidity of the volume of gas-air mixture and adjusts the lower explosive limit level according to a function of at least the data representative of humidity of the volume of gas-air mixture; wherein the function of at least the data representative of humidity of the volume further comprises calculating a partial pressure of water vapor in the volume of gas-air mixture using the input relating to temperature of the volume of gas-air mixture and a humidity of the volume of gas-air mixture and multiplying the lower explosive limit level by a factor comprising ambient pressure divided by (ambient pressure—the partial pressure of water vapor).