公开(公告)号：US3562546A

公开(公告)日：1971-02-09

申请号：US3562546D

申请日：1969-04-15

Applicant: DANFOSS AS

Inventor： KRAEMER ASGER

IPC: G01F23/24 ,  H01H37/00

CPC classification number: G01F23/247 ,  Y10T307/773

Abstract: The invention relates to control apparatus for limiting the level of the liquid in a container to a predetermined level. A thermostatic element combined with a heating element comprises an assembly which senses and is subjected to a relatively lower temperature when surrounded by a liquid in the container than it does when the liquid level is lower than the level of the assembly. The mode of operation is based on the thermostatic element operating an electrical switch, through pressure responsive means, which controls the supply of liquid to the container. The switch has on and off positions which correspond to the upper and lower temperatures to which the thermostatic element is subject. The absolute values of the upper and lower temperatures to which the thermostatic valve may be subjected may vary substantially depending on the temperature of the liquid and the ambient temperature but the temperature differential between the absolute temperatures is substantially constant. The invention involves the providing of pressure compensating means so that it is only the temperature differential between the upper and lower temperatures to which the thermostatic element is subjected that causes the switch to be actuated to its on or off position.