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US 2011/0299562 A1Published application
Diverse and Redundant Resistance Temperature Detector
AssigneeAnalysis and Measurement Services Corporation
InventorHashem M. HASHEMIAN
Life of this patent
Estimating the term…
Abstract
A diverse and redundant resistance temperature detector (“D&R RTD”) is provided. The D&R RTD is utilized in obtaining temperature readings in environments, such as fluids and gasses, by measuring electrical characteristics of the D&R RTD that are influenced by the temperature. Furthermore, the D&R RTD's are arranged such that a plurality of measurements can be obtained, which provides sufficient diversity and redundancy of the measurements for enhanced diagnostics to be performed, such as optimization for fast dynamic response, calibration stability, in-situ response time testability, and in-situ calibration testability.
Claims18
A temperature detector comprising:
- a sensing element having a first lead and a second lead, said sensing element having a electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a first temperature measurement;
- a first pair of thermocouple wires connected to said first lead at a first thermocouple junction and extending from said first thermocouple junction to define a first pair of connection points, said first thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a second temperature measurement;
- and
- a second pair of thermocouple wires connected to said second lead at a second thermocouple junction and extending from said second thermocouple junction to define a second pair of connection points, said second thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a third temperature measurement;
- wherein said first temperature measurement is acquired by measuring the electrical characteristic of said sensing element using one of said first pair of connection points and one of said second pair of connection points, said second temperature measurement is acquired by measuring the electrical characteristic of said first thermocouple junction using said first pair of connection points, and said third temperature measurement by measuring said electrical characteristic of said second thermocouple junction by using said second pair of connection points.
2 more elements
A temperature detector comprising:
- a first sensing element having a first lead and a second lead, said first sensing element having a electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a first temperature measurement;
- a first pair of thermocouple wires connected to said first lead of said first sensing element at a first thermocouple junction and extending from said first thermocouple junction to define a first pair of connection points, said first thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a second temperature measurement;
- a second pair of thermocouple wires connected to said second lead of said first sensing element at a second thermocouple junction and extending from said second thermocouple junction to define a second pair of connection points, said second thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a third temperature measurement;
- a second sensing element having a first lead and a second lead, said sensing element having a electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a fourth temperature measurement;
- a third pair of thermocouple wires connected to said first lead of said second sensing element at a first thermocouple junction and extending from said first thermocouple junction to define a third pair of connection points, said third thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a fifth temperature measurement;
- and
- a fourth pair of thermocouple wires connected to said second lead of said second sensing element at a second thermocouple junction and extending from said second thermocouple junction to define a fourth pair of connection points, said fourth thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a sixth temperature measurement;
- wherein said first temperature measurement is acquired by measuring the electrical characteristic of said first sensing element using one of said first pair of connection points and one of said second pair of connection points, said second temperature measurement is acquired by measuring the electrical characteristic of said first thermocouple junction using said first pair of connection points, and said third temperature measurement by measuring said electrical characteristic of said second thermocouple junction by using said second pair of connection points, said fourth temperature measurement is acquired by measuring the electrical characteristic of said second sensing element using one of said third pair of connection points and one of said fourth pair of connection points, said fifth temperature measurement is acquired by measuring the electrical characteristic of said third thermocouple junction using said third pair of connection points, and said sixth temperature measurement by measuring said electrical characteristic of said fourth thermocouple junction by using said fourth pair of connection points, fourth temperature measurement by measuring said electrical characteristic between one of said third pair of connection points and one of said fourth pair of connection points, said fifth temperature measurement by measuring said electrical characteristic between said pair of third connection points, and said sixth temperature measurement by measuring said electrical characteristic between said pair of fourth connection points.
5 more elements
A temperature detector comprising:
- a sensing element having a first lead and a second lead, said sensing element having a electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a first temperature measurement;
- a first pair of thermocouple wires connected to said first lead at a first thermocouple junction and extending from said first thermocouple junction to define a first pair of connection points, said first thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a second temperature measurement;
- a second pair of thermocouple wires connected to said second lead at a second thermocouple junction and extending from said second thermocouple junction to define a second pair of connection points, said second thermocouple junction having an electrical characteristic that varies in response to temperature, said electrical characteristic having a substantially linear variation over a selected temperature range and corresponding to a third temperature measurement;
- and
- a thermowell enclosing said sensing element, said first thermocouple junction and said second thermocouple junction;
- wherein said first temperature measurement is acquired by measuring the electrical characteristic of said sensing element using one of said first pair of connection points and one of said second pair of connection points, said second temperature measurement is acquired by measuring the electrical characteristic of said first thermocouple junction using said first pair of connection points, and said third temperature measurement by measuring said electrical characteristic of said second thermocouple junction by using said second pair of connection points.
3 more elements
Dependencies are inferred from the claim text.