Thermal sensor to determine temp. of structural part - is esp. for cylinder head of reciprocating IC engine and employs liq. filled capsule

摘要

The structural part has a receiving hole into which the thermal sensor projects with a capsule filled with liquid and where it is held in place with a screw union. The liquid in the capsule expands in dependentce on the temperature and this expansion is transmitted to a control element. The capsule of the thermal sensor is made of glass which is broken when the capsule is screwed into the receiving hole. The glass capsule can be inserted into the union like an ampoule. The control element can be a metal bellows or it can be designed as a working cylinder. It can also be a diaphragm. The control element can be at some distance from the thermal sensor and the liquid expansion transmitted to the element by the interposition of a second liquid column.