Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1990-06-25
1992-12-01
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Thermal type
73304R, 338 22R, 338 24, G01F 2324
Patent
active
051671530
ABSTRACT:
An RTD (resistance temperature sensor or detector) sensing device which is a long, thin, unitary device adapted to be distributed across an extended field for the continuous, uninterrupted sensing or interrogation of such field, avoiding the inaccuracy, unreliability, and excessive expense of conventional "point" RTD and thermocouple sensors currently employed for this purpose. According to the invention, a very long, thin, ductile protective metal outer sheath houses a coextensive body of insulation material, which in turn supports and electrically insulates one or more coextensive RTD filaments and in most forms of the invention one or more heater filaments. Distributed RTDs of the invention may, along their lengths, have continuous linear function sensitivity, continuous variable function sensitivity, or step function sensitivity. Distributed RTDs of the invention have particular utility for gauging liquid level, measuring average mass flow velocity of fluids in large ducts, and sensing the average temperature of an extended nonisothermal field.
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Bennett G. Bradley
Cuchlinski Jr. William A.
Fluid Components, Inc.
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