Gas sensing device
AssigneeCity Technology Limited
InventorsDavid Davies, Ian Andrews, Anthony Cowburn, Stuart Cutler
Life of this patent
Estimating the term…
Abstract
A device for sensing a gas comprises a plastics housing (106, 107) moulded in situ around at least one portion of a conducting lead frame (100), the housing defining an enclosure (113) and being provided with means for enabling gas flow into the enclosure. A gas sensitive element (114) within the enclosure (113) is mounted to the conducting lead frame (100). The conducting lead frame (100) comprises connection leads which are accessible through, and at least partially encapsulated by, the wall of the housing.
Claims35
A device for sensing a gas, the device comprising a plastics housing moulded in situ around at least one portion of a conducting lead frame, the housing defining an enclosure and being provided with means for enabling gas flow into the enclosure, and at least one gas sensitive element within the enclosure mounted to the conducting lead frame, wherein the conducting lead frame comprises connection leads which are accessible through, and are at least partially encapsulated by, the wall of the housing.
A device for sensing a gas, the device comprising at least one gas sensitive element contained within a flameproof, plastics housing supporting a flame arrestor which enables gas to flow into the interior of the housing, and the gas sensitive element being connected to conducting leads which are accessible through, and are at least partially encapsulated by, the wall of the housing, the encapsulating wall having sufficient thickness such that the housing will not allow the propagation of an ignition source from within the device to the ambient atmosphere, under working conditions.
A method of manufacturing a device for sensing a gas, the method comprising moulding a plastics housing in situ around at least one portion of a conducting lead frame such that the housing defines an enclosure, providing the housing with means for enabling gas flow into the enclosure, mounting at least one gas sensitive element inside the enclosure and connecting it to the conducting lead frame, and providing the conducting lead frame with connection leads which are accessible through, and at least partially encapsulated by, the wall of the housing.
A method of manufacturing a device for sensing a gas, the method comprising moulding a plastics housing in situ directly around a set of conducting leads, mounting at least one gas sensitive element inside the housing and connecting it or them to the conducting leads which are accessible through, and at least partially encapsulated by, the wall of the housing, the encapsulating wall having sufficient thickness that the housing will not allow the propagation of an ignition source from within the device to the ambient atmosphere, under working conditions, and securing a flame arrestor to the housing which completes the flameproof enclosure yet enables gas to flow into the interior.
(canceled)
Dependencies are inferred from the claim text.