Patent ID: 6561121
Filing Date: 2003-05-13
Classification: F16C,G01K

Abstract:
A apparatus for determining a temperature change in an item, the apparatus comprising a thermally reactive means arranged to react to a change in temperature so as to move a detectable part in one of two directions dependent on the sense in which the temperature changes, and a detection means arranged to sense the detectable part when in a predetermined proximal range, the reactive means being mountable on an item, such that the detectable part is moveable by the reactive means relative to the detection means in response to temperature changes, wherein movement of the detectable part is detected by the detection means, characterized in that the reactive means comprises a thermally expandable fluid in a closed channel which channel is provided in a bent member, such that a change in temperature causes a change in volume of the fluid which causes the member to respectively either straighten or further bend.