Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Reexamination Certificate
1999-04-20
2001-01-30
Kincaid, Kristine (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
Reexamination Certificate
active
06180889
ABSTRACT:
BACKGROUND OF INVENTION
During numerous processes temperature control is required. One of the ways to obtain the necessary data employs a system consisting of a thermocouple sensor connected to a hand held device (thermometer). A thermocouple cable used to connect sensor to a hand held device has to meet requirements being derived from the particular process parameters and by the typical way of handling and using this device.
Additionally, due to the way in which such hand held device is used, cable design should provide sufficient strength and flexibility in order to withstand continuous tension and bending. The outer insulation material should have sufficient cut-through and abrasion resistance necessary for cable reliability and therefore for reliable operation of the whole measurement system. A further requirement is that cable must have a small diameter and lightweight to facilitate the use.
BRIEF SUMMARY OF INVENTION
The invention consists of a thermocouple cable, particularly suited for use in food processing. Two individually insulated with fluoropolymer material thermocouple wires in twisted relation. The strain bearing function is provided by a pultrusion of a plurality of aramid fibers parallel to the centerline of the cable. Sintered fluoropolymer tape wrapped around thermocouple wires and aramid fibers and holds them together. Nickel plated copper or stainless steel shield that prevents outer insulation from stretching. A water impervious, high temperature resistant, flexible, abrasion resistant, food safe fluoroelastomer outer insulation pressure extruded around the wires, tape, shield and aramid fibers.
REFERENCES:
patent: 2665322 (1954-01-01), MacDonald
patent: 3845706 (1974-11-01), Strimple et al.
patent: 4408088 (1983-10-01), Foote
patent: 4484018 (1984-11-01), McLynn
Hawley “Condensed Chemical Dictionary” pp. 470-471, 1981.
Atkins Technical Inc.
Kincaid Kristine
Nguyen Chau N.
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