G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/14 (2006.01) G01F 23/16 (2006.01)
Patent
CA 2076794
A bubbler liquid level sensing apparatus comprises a liquid storage tank with a vapor region and a fluid region and first and second sensing tubes exposed to the vapor region and fluid region, respectively. A pump with an inlet and an outlet is included, the inlet is pneumatically coupled to the first sensing tube and the outlet is pneumatically coupled to the second sensing tube. First and second controllable valves each have a first input. The first input of the first controllable valve is pneumatically coupled to the first sensing tube and the first input of the second controllable valve is pneumatically coupled to the second sensing tube. The first and second controllable valves each also have a second input pneumatically coupled to the atmosphere, wherein each of the controllable valves has an output that is selectively pneumatically coupled to either the first input or second input of said valve. A transducer is coupled to the outputs of the first and second controllable valves so that the transducer may be selectively coupled either to the atmosphere or the sensing tubes.
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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