Electricity: conductors and insulators – Insulators – Through wall or plate
Patent
1977-01-10
1977-10-18
Ward, Jr., Robert S.
Electricity: conductors and insulators
Insulators
Through wall or plate
277 4, 277 37, 73304C, 324 61P, 138149, H01G 700, H01B 1730
Patent
active
040547442
ABSTRACT:
There is disclosed an instrument probe assembly having a positive seal to prevent invasion of process fluids into the cavity of the assembly body. The instrument probe assembly comprises an elongated probe member which projects from a through passageway of the assembly body. The latter has attachment menas, typically pipe threads, at one end to permit it to be seated in an aperture of a process vessel, typically a pressure vessel. The elongated probe which projects from the assembly body into the vessel is commonly used as a capacitance sensing probe to determine the level of liquids or granular solids within the vessel. The probe assembly of this invention includes a sleeve projection from the inboard face of the assembly body, surrounding the projecting elongated probe member and a laminated sleeve formed of an inner sleeve of thermoplastic resin and an outer sleeve of heat shrinkable plastic which overlies the annular joint between the assembly body sleeve and the probe member and which is thermally applied, effectively sealing this annular joint against invasion of process fluids into the assembly body.
REFERENCES:
patent: 2091824 (1937-08-01), Lewis
patent: 3109882 (1963-11-01), Maltby
patent: 3491799 (1970-01-01), Foll
patent: 3774108 (1973-11-01), Ogilvie
patent: 3831069 (1974-08-01), Merrell et al.
patent: 3843832 (1974-10-01), Petersen et al.
Robertshaw Controls Company
Ward, Jr. Robert S.
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