Refrigeration – With indicator or tester – Condition sensing
Reexamination Certificate
2008-04-01
2008-04-01
Norman, Marc (Department: 3744)
Refrigeration
With indicator or tester
Condition sensing
C062S225000, C073S024010, C073S054410
Reexamination Certificate
active
07350367
ABSTRACT:
A system for monitoring a fluid in an environmental control system includes a mechanical resonator positioned for contacting a thermal change fluid. In some embodiments, the mechanical resonator is positioned in a passage for containing the thermal change fluid. Suitable thermal change fluids include an R-134A refrigerant, a mineral oil, an ester lubricant or a mixture thereof; a superheated refrigerant; or an elevated pressure and elevated temperature vapor, an elevated pressure liquid, a reduced pressure liquid, a reduced pressure vapor and combinations thereof. The mechanical resonator can be a flexural resonator or a torsion resonator. In some embodiments, the mechanical resonator is a tuning fork resonator. Methods of the invention include monitoring a response of the mechanical resonator to the thermal change fluid. In some embodiments, at least a portion of the mechanical resonator is translated through the thermal change fluid and the response of the resonator to the fluid is monitored.
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Feland, III John M.
Kolosov Oleg
Matsiev Leonid
Rust William
Uhrich Mark D.
Norman Marc
Senniger Powers
Visyx Technologies, Inc.
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