Patent ID: 8791828

Claim:
A carbon monoxide detector comprising: a sensor configured to detect a presence of carbon monoxide, and generate a signal indicative of the presence of carbon monoxide; a controller in signal communication with the sensor, the controller configured to measure a level of detected carbon monoxide in response to receiving the signal generated by the sensor, the controller further configured to detect a first trouble condition representative of an end-of-life condition of the sensor, and a second trouble condition different from the first trouble condition; a transmitter operatively coupled to the controller, the transmitter configured to transmit, to a remote agent, a first trouble signal indicative of the first trouble condition, and a second trouble signal indicative of the second trouble condition, the first trouble signal being different from the second trouble signal so that an end-of-life condition of the sensor detected by the controller and indicated by the first trouble signal can be distinguished at the remote agent from a second trouble condition detected by the controller and indicated by the second trouble signal.