Parallelogram actuated liquid level sensor

摘要

A liquid level sensor for insertion into a tank for measuring the liquid level in the tank comprises an elongate tubular frame and a float movable inside the frame to seek the liquid level. A float lock guide formed as an elongate member is mounted lengthwise inside the frame. A float lock formed as an elongate member is located inside the frame parallel to the float lock guide. A plurality of linkages is pivotally connected between the float lock guide and the float lock such that lengthwise movement of the float relative to the float lock guide causes corresponding lateral movement of the float in the frame between an unlocked position where the float is free to move lengthwise in the frame to seek the liquid level and a locked position where frictional forces retain the float between the float lock and an inner wall portion of the frame.