Methods, systems, and computer programs encoded on a computer storage medium for real-time acoustic adaptation using stability measures are disclosed. The CMV has a thermally stable housing with orifices to allow the contact of a gas that contains one or more diagnostic volatiles with an absorbent that extracts and concentrates the diagnostic volatiles. The actuator includes a valve circuit configured to selectively couple the first fluid port with a high-pressure fluid source when piston travel in the first direction is desired, and with a low-pressure fluid source when piston travel in the second direction is desired. The property of the fluid is computed on these right and left temperature detected signals.