A self-sustaining sensor is provided, being configured to detect a fill level, a limit level, or a pressure of a medium or to measure an interface of a mixture of media in a transport container, the sensor including: a closed housing configured to be submerged in the medium; and a sensor element arrangement including one or more sensor elements arranged in or on the housing, in which the sensor is configured to rest on a bottom of the container and/or to float on a separating layer of the mixture of media during measurement, without being fixed to the container. A self-sustaining fill level measurement system, limit level measurement system, or pressure measurement system is also provided. A method for detecting a fill level or a limit level or a pressure of a medium or for interface measurement of a mixture of media in a transport container is also provided.

A fluid level measurement system using a buoyant body includes a guide part installed in a direction perpendicular to the bottom surface of a fluid storage tank, and provided with a space in which a fluid can move therein; a buoyant body inserted into the guide part, and configured to float along the surface of the fluid inside the guide part; and a measurement part coupled to the top end of the guide part, and configured to measure the level of the surface of the fluid inside the fluid storage tank by transmitting a signal toward the buoyant body in the inner space of the guide part and then receiving a signal reflected from the buoyant body.

A method includes conveying a wellbore fluid into a container of a wellsite system, the container having a float angle hydrometer housed therein and the float angle hydrometer including a buoyant structure, and a measuring component housed within or attached to the buoyant structure. The method further includes determining one or more fluid properties of the wellbore fluid with the float angle hydrometer based on an inclination of the buoyant structure within the wellbore fluid, the one or more fluid properties including at least one of density, specific gravity, or fluid level.

A method includes conveying a wellbore fluid into a container of a wellsite system, the container having a float angle hydrometer housed therein and the float angle hydrometer including a buoyant structure, and a measuring component housed within or attached to the buoyant structure. The method further includes determining one or more fluid properties of the wellbore fluid with the float angle hydrometer based on an inclination of the buoyant structure within the wellbore fluid, the one or more fluid properties including at least one of density, specific gravity, or fluid level.

A container filling device including a body having a top end, a bottom end, a first opening at the top end, a second opening at the bottom end, and a channel formed there between is provided in an embodiment herein. A diameter of the body at the top end is greater than a diameter of the body at the bottom end, and a rod component is disposed within the channel and is slidable within the channel, the rod component having a first end and a second end, an indicator element is disposed toward the first end of the rod component and a contact element is disposed toward the second end, wherein upon filling the container with a fluid, the contact element remains at the surface of the fluid, and the indicator element visually indicates the level of the fluid in the container.

The measuring cup includes numerous embodiments configured for a user to precisely determine the cup contents without need to lift the cup to one's eye level or to lower the eye level to the level of the cup contents. The various embodiments include folding cups; cups having transparent passages in the wall; cups having adjustably positionable bottoms; cups having level indicator rods in the cup interior extending upward from the cup bottom; cups having one or more filaments extending across the cup interior; cups having rigid level indicators spanning the cup interior; cups having adjustably positionable level indicator tabs therein; cups having buoyant level indicator tabs adjustably positionable in the cup interior; and cups having removable clip-on scales extending down along the interior of the cup wall, the scales having a plurality of attachment points for the removable attachment of a level indicator tab at a desired attachment point.

An improved fluid flow gauging device includes a light enhanced acrylic block flow tube to optimize visualization of pressure readings. An LED or other light source is fitted to the top of the flow tube and illuminates a float or bobbin from above to provide more accurate readings, especially in low light conditions such as modern operating rooms. In addition, the light enhanced flow tube provides a mechanical backup in the case of failure of newer electronic systems and visually matches the graphical flow display, simultaneously providing a double-check of the electronic system.

An improved fluid flow gauging device includes a light enhanced acrylic block flow tube to optimize visualization of pressure readings. An LED or other light source is fitted to the top of the flow tube and illuminates a float or bobbin from above to provide more accurate readings, especially in low light conditions such as modern operating rooms. In addition, the light enhanced flow tube provides a mechanical backup in the case of failure of newer electronic systems and visually matches the graphical flow display, simultaneously providing a double-check of the electronic system.

Disclosed is a composite hydrological monitoring system, in which a counterweight component and a test component are respectively connected to both opposite ends of a strip and a plurality of sensors are disposed at different vertical positions. Accordingly, the scour depth can be measured by sensing the location of the counterweight component, whereas the water level and/or flow velocity can be determined by signals from the sensors. When the counterweight component moves downward with sinking of the riverbed, the strip would be pulled down and thus causes the test component to present a change in mechanical energy. Accordingly, the sinking depth can be measured by sensing the change of the mechanical energy. Additionally, since the water level variation would cause signal changes of the sensors arranged in a row along a vertical direction, the change of water level can be determined accordingly.

A system and method for measuring fluids include a vessel containing at least two fluids with a drain pipe, a seal housing, a tool assembly, and a float assembly. The seal housing fits onto the drain pipe of existing vessels or tanks, and the tool assembly and float assembly are inserted through the seal housing to the vessel to measure the fluids inside the tank. The tool assembly has a shaft section and a flexible section. The flexible section extends into the vessel and through any bend in the drain pipe so that the system is compatible with retrofitting vessels with different drain pipe shapes. The float assembly can be released from the end of the bent drain pipe to float to the fluid boundary between different fluids in the vessel. The float assembly can also be retracted to safe position within the seal housing.