Limit sensing indicator

Details Limit sensing indicator Limit sensing indicator

G - Physics

01

K

G01K 1/00 (2006.01) B61K 9/04 (2006.01) F01D 17/08 (2006.01) F16N 29/00 (2006.01) G01K 11/06 (2006.01) G07C 3/00 (2006.01)

Patent

CA 2042628

LIMIT SENSING INDICATOR Abstract of the Disclosure A limit sensing device (14) for permanently indicating when a predetermined temperature limit has been reached in a fluid conduit, includes a housing (20) mounted on the conduit in heat transmitting rela- tion with the fluid and an indicator (30) movable in the housing (20) between a retracted position and an activated, non-resettable, extended position to provide a visual indication that the predetermined temperature limit has been reached. The indicator (30) is biased outwardly towards the activated position and a retainer in the form of an annulus formed of fusible material (40) normally secures the indicator in the retracted position within the housing against the forge of a biasing spring (42) until the predetermined temperature has been reached causing the retainer to melt or fuse and thereby release the indicator to move outwardly to the extended position providing a visual indication signaling that an overtemperature condition has been reached in the fluid conduit.

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