Abstract: A float-type liquid level gauge is provided for measuring the level of a liquid such as LPG within a horizontally oriented cylindrical tank (228). The gauge includes a movable pivot arm (212) supporting a float arm assembly (225) and coupled by gears (207, 214) to a magnet shaft (206, 208) and magnet (210) mounted in a rigid support arm (204) through a sideways-securing shaft channel(209). The support arm is connected to the lower side of a gauge head (202) and the magnet extends into a passage (52) in the gauge head so as to be magnetically coupled to a level indicating dial (226) provided on the upper side of the gauge head. The lower portion (302) of the support arm is angled and offset with respect to a longitudinal axis (265) such that a high ratio can be obtained between the gears while still permitting the components of the gauge to pass through the opening of a standard pressure fitting (234).

Abstract: A float-type liquid level gauge is provided for measuring the level within a tank of liquids such as liquified petroleum gases. The liquid level gauge includes a movable float arm (30) coupled by gears (46, 48) to a magnet shaft (26) and magnet (28) mounted in a rigid support arm (24) through a side-accessible shaft passage (110). The support arm is connected to the lower side of a gauge head (22) and the magnet extends into a passage (52) in the gauge head so as to be magnetically coupled to a level indicating dial (34) provided on the upper side of the gauge head.

Abstract: Use is made of thermoplastic materials in layered configurations as a thermally stable, rigid but not brittle strip of lengths of six inches to ten feet or more. The layered strip contains layers of conductive fibers in a resin matrix, which, through use of appropriate contact mechanisms and wiring, provide an assembly with an infinite potentiometer scale. The strips are especially useful in linear positioning indicators such as pneumatic and hydraulic cylinder and liquid level gauges. The strips are conductively connected by cutting a bias surface relative to said strips and placing resin thereon.

Abstract: An air spring apparatus with an internal height sensor is provided. The air spring includes an end cap member, a piston member and a flexible annular sleeve connected therebetween forming a sealed air chamber. The height sensor includes a sensing element and an indicating element and is mounted within the air chamber. The sensing element is mounted to one of the end cap member and piston member. The indicating element has a first portion connected to the end cap member, a second portion connected to the piston member, and an elastic member connected therebetween. The length of the elastic member defines an indicating level sensible by the sensing element such that movement of the end cap member relative to the piston member produces a much smaller proportional movement of the indicating level relative to the sensing element. This proportion reduction of movement allows a smaller sensor to measure a relatively large change in height.

Abstract: Use is made of thermoplastic materials in layered configurations as a thermally stable, rigid but not brittle strip of lengths of six inches to ten feet or more. The layered strip contains layers of conductive fibers in a resin matrix, which, through use of appropriate contact mechanisms and wiring, provide an assembly with an infinite potentiometer scale. The strips are especially useful in linear positioning indicators such as pneumatic and hydraulic cylinder and liquid level gauges.

Abstract: A floatless liquid level gauge assembly utilizing polymeric resistive/conductive elements is provided which measures the liquid level of partially conductive or conductive liquids in a tank using a three terminal voltage divider network or a two terminal voltage or current network. The polymeric resistive/conductive element(s) extending into the tank and the liquid in the tank provide an electrical path which provides a signal proportional to the liquid level in the tank.

Abstract: A floatless liquid level gauge assembly utilizing polymeric resistive/conductive elements is provided which measures the liquid level of partially conductive or conductive liquids in a tank using a three terminal voltage divider network or a two terminal voltage or current network. The polymeric resistive/conductive element(s) extending into the tank and the liquid in the tank provide an electrical path which provides a signal proportional to the liquid level in the tank.

Abstract: A floatless liquid level gauge assembly utilizing polymeric resistive/conductive elements is provided which measures the liquid level of partially conductive or conductive liquids in a tank using a three terminal voltage divider network or a two terminal voltage or current network. The polymeric resistive/conductive element(s) extending into the tank and the liquid in the tank provide an electrical path which provides a signal proportional to the liquid level in the tank.

Abstract: A gauge for measuring fluid level, especially cryogenic fluids, having a head assembly with a passageway to receive the upper portion of a lift rod assembly. The lift rod assembly includes a spring attached at the upper end to the head and at the lower end attached to a spring guide. A lift rod is mounted adjustably on the spring guide, and the upper end of the lift rod has attached a magnet and the lower end of the lift rod a displacement member. The upper end of the lift rod is received in the passageway of the head. Attached to the head adjacent to the passageway is a dial assembly adjustably mounted in relation to the passageway of the head.