Abstract: Apparatus for measuring changes in volumetric content of a storage tank having a predetermined relationship between changes in liquid level and the change in volumetric content. The apparatus includes a tape windable onto and off a reel co-acting with a counterweight. The tape has means at spaced intervals along a selected portion of the length thereof consisting of performations or, alternatively, at least one notched edge driving a digital counter through a drive pulley. The means at spaced intervals on the tape positively drives the counter with a controlled amount of slip between the tape and the counter driving mechanism corresponding to predetermined non-linear relationships that may exist between the float movement and volume change whereby there is a direct reading of changes in volumetric content of the storage tank throughout the entire extent of travel of the tape.

Abstract: A level determining-device wherein a chain is suspended from a mechanism which is adapted to raise and lower the chain. Means are provided for sensing the weight of a part of the chain hanging freely from the mechanism, whereby the length of the freely hanging part, and hence a desired level, can be determined.

Abstract: An adjustable liquid level measuring device for measuring the level of a liquid in a variety of container configurations. The device has an indicator means for mounting on a container for providing a visual reading related to the level of the liquid in the container. The device has a frame connected to the indicator means and a buoyant float adapted for floating on the surface of the liquid in the container. The device has an endless flexible chain with a first loop adjacent to the indicator means and another portion connected to the buoyant float. The chain also has a loop movably mounted on the frame so that movement of the float moves the first loop relative to the indicator means. The indicator means is connected to have an indicator dial pointer moved by the movement of the first loop.

Abstract: A data acquisition device used to measure fluid level includes a float coupled to a measuring tape. The float includes a body with a first surface defining a first cross-sectional area and a second surface defining a second cross-sectional area; the second cross-sectional area being smaller than the first. A tube extends from the device to a location above the fluid level. The float is positioned within the tube in an orientation wherein the first surface is parallel to the axis of the tube. The float is then lowered to a point outside the tube and pivoted such that the first surface is transverse to the axis of the tube. The float is then lowered to the fluid surface allowing the data acquisition device to record the fluid level.

Abstract: A liquid level measuring device having an elongated frame is disclosed. One or more floats are mounted in the frame on cables mounted between pulleys at each end of the frame. Brake pins frictionally engage the guide cables and means are provided to selectively disengage the brake pins from the guide cables. A thermometer may be attached to the frame to provide temperature readings. Also, a timing device may be attached to the frame to provide the proper duration for obtaining exact temperature and liquid level(s) measurements.

Abstract: An indicating gauge has dual floats to measure the levels of two liquids contained in the same tank. A separate measuring tape is controlled by each float to provide an indication of the liquid level through a single viewing window above the tank. In certain situations, a single float and measuring tape is used to provide an indication of the level of one liquid within the tank. A wiper is engageable with the viewing window to permit cleaning of the inside surface of the window.

Abstract: A liquid level measuring apparatus consisting of a mechanism to convert the change in the liquid level into a rotational movement, a scanning apparatus to successively scan the magnetic-field generating electric conductors provided on a disc by means of a magneto-sensitive head caused to rotate by said mechanism, an electronic circuit to produce measured figures of said electric conductors scanned by said scanning apparatus as pulse signals, and a digital indicator caused to be operated by means of said signals produced by said electronic circuit.

Abstract: A means to monitor the depth of water in a well and to prevent a pump from operating if the water level falls to a predetermined level, consisting of float and weight means operating a depth indicator and cutoff switch.

Abstract: A small, permanent magnet is eccentrically supported on a shaft that is rotated by some means, such as gears, in response to linear change in some quantity, e.g. accumulated water from rainfall. A float on the surface of the water in a receptacle transmits the motion to the gears. At least three sensors, responsive to magnetic flux, are mounted in a circle concentric about the shaft so that the rotating magnet will produce a response as it passes each sensor. Each sensor is connected to an input terminal of two of a plurality of flip-flops (one for each sensor), so that the resultant stored bit of information in each flip-flop is determined by two different sensors. This stored bit comprises a digit of a three digit binary code that is changed whenever a sensor responds. It is available at the output terminal of each flip-flop, which is connected to an AND-OR inverter containing at least three two-input AND gates and an OR gate.

Abstract: A level-sensing head is suspended from a capstan above a vessel by means of a flexible link which is wound around the capstan to raise or lower that head upon rotation thereof in one direction or the other. Depending upon the position of the sensing head relative to the level of a liquid or other flowable mass in the vessel, the head causes emission of either of two control signals triggering a pulse generator to step a motor, coupled with the capstan, in a sense tending to maintain that relative level between two narrow limits. The output of the pulse generator is also fed to recording equipment and/or to a digital comparator designed to establish a preselected level which may be modified from time to time by a programmer. The flexible link may serve as an electrical or fluidic transmission channel for control signals originating at the sensing head; with a floating sensing head such control signals can also be generated by a torsion monitor inserted between the motor shaft and the capstan.

Abstract: A gage mechanism for determining the level of a liquid, comprising a measuring means joined to a liquid level indicating device, a floating stilling chamber circumscribing the periphery of the liquid level indicating device, said stilling chamber having walls extending above wave action of the liquid, and vertical guide means for controlling lateral movement of the chamber at all levels at which the liquid level is to be measured.

Abstract: A storage tank liquid level sensor for indicating levels of two immiscible liquids in the tank wherein a first magnet is carried by a float on top of one liquid and a second magnet is carried by a float on top of the other liquid, the first magnet operating a switch to indicate when the one liquid reaches a predetermined level and the second magnet moving a coded tape with respect to a read head in accordance with changes in the level of the other liquid, a transmitter to transmit data from the read head, a receiver for such data, an arithmetic logic unit to convert the data to binary coded decimals, a memory unit for storage of BCD data, and a display unit for selectively addressing the computer and displaying selected data.