Multiple detector apparatus and method for monitoring an environment

A monitoring device for detecting a particular condition, comprising:

• a first carrier;
• a processor disposed on the first carrier;
• a first sensor disposed on the first carrier, wherein the first sensor is coupled to the processor and configured to detect when the monitoring device is subjected to at least a first magnitude of a first condition;
• a second sensor disposed on the first carrier, wherein the second sensor is coupled to the processor and configured to detect when the monitoring device is subjected to at least a second magnitude of a second condition;
• a second carrier disposed over at least a portion of one or more of the processor, the first sensor, and the second sensor,
• wherein the processor is configured to generate a signal in response to detection of the first sensor being subjected to at least the first magnitude of the first condition and the second sensor being subjected to less than the second magnitude of the second condition;
• and
• wherein the second sensor comprises a bilayer construction of a top layer and a bottom layer, the top layer comprising a selectively permeable polymer configured to provide a barrier to certain molecules and allow other molecules to pass through, the bottom layer comprising a conductive polymer.