Flueric partial pressure sensors
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1987
filing date -
Dec 8, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The temperature range for stable operation of a flueric partial pressure sensor (300) is improved by temperature-responsive means (80, 60) which vary with temperature change the suction applied by a flueric aspirator (27) in drawing gas through sensor bridge legs (12, 13) and a power line (37) of a flueric amplifier (11). The temperature-responsive means may comprise temperature-sensitive adjustment means (107, FIG. 2) embodied in a pressure reducing valve (80) to vary the pressure of working gas supplied by way of delivery line (28) for driving the flueric aspirator. Alternatively or additionally the temperature-responsive means may comprise a temperature-sensitive bleed valve (60) incorporated in a common outlet (14) from the bridge legs and the flueric amplifier power line. Further improvement at the low temperature end of the working range may be obtained by incorporating pressure reducing means such as a linear flow resistor 120) in the supply line (30) to the main power jets (31, 32) of the flueric amplifier.
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