G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/08 (2006.01) G01L 11/00 (2006.01) G01D 3/04 (1990.01)
Patent
CA 2093953
ABSTRACT A temperature compensating device is provided for a purge gas pressure monitoring system in which a piezometer line has an outlet end for submerging in a medium to be monitored and an opposite end for connection to a suitable pressure responsive instrument, with a purge gas supply connected to the line so as to supply purge gas as bubbles from the outlet end of the tube. A temperature detector device runs the length of the piezometer line to produce an output signal proportional to an average of the temperature along the length of the line. This may be a resistance temperature detector in the form of a U-shaped conductive wire with opposite legs of the U wound spirally in opposite directions along the length of the line with the connected end of the U being located at the outlet end of the tube. This provides a variable resistance which varies as a function of the average temperature, and which can be connected to conditioning circuitry for producing a desired temperature dependent output.
Glassey Eugene A.
Loh Ralph A.
Fluid Data Systems
Smart & Biggar
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