A device for detecting and alleviating flooding and blocked storm sewers includes a manhole cover coupled to a float body. The device also includes a canister having a drain hole and a valve. The device also includes multiple guides that can catch onto part of a sewer. The device is configured such that when water flows into the canister, the manhole cover, float body, and guides rise and the valve is opened.

A device for detecting and alleviating flooding and blocked storm sewers includes a manhole cover coupled to a float body. The device also includes a canister having a drain hole and a valve. The device also includes multiple guides that can catch onto part of a sewer. The device is configured such that when water flows into the canister, the manhole cover, float body, and guides rise and the valve is opened.

A filling level indicator for determining a filling level in a tank includes: a resistor network; a contact element arranged spaced apart from the resistor network; and a magnetic element movable relative to the resistor network and the contact element. The contact element has a contact region deflectable by the magnetic element. The contact region is deflectable so as to produce an electrically conductive connection between the contact region and the resistor network. The contact region comprises a planar tape-shaped element that is partially deflectable by a magnetic force of the magnetic element. The contact region has at least two portions that are arranged mutually adjacent to, and mutually spaced apart from, one another.

A filling level indicator for determining a filling level in a tank includes: a resistor network; a contact element arranged spaced apart from the resistor network; and a magnetic element movable relative to the resistor network and the contact element. The contact element has a contact region deflectable by the magnetic element. The contact region is deflectable so as to produce an electrically conductive connection between the contact region and the resistor network. The contact region comprises a planar tape-shaped element that is partially deflectable by a magnetic force of the magnetic element. The contact region has at least two portions that are arranged mutually adjacent to, and mutually spaced apart from, one another.

An apparatus and method of determining the level of a liquid in a reservoir having curved surfaces is described, where the measuring device comprises a support having a radius of curvature conformable to the curvature of the reservoir. A float assembly is captivated to the support so that it may move freely in the vertical direction, but is constrained in rotation with respect to the support by compatible asymmetrical structural features. The float assembly includes an element that can be sensed by a sensor assembly that is positioned along the support over the length of the support encompassing the range of fluid levels to be measured.

An apparatus and method of determining the level of a liquid in a reservoir having curved surfaces is described, where the measuring device comprises a support having a radius of curvature conformable to the curvature of the reservoir. A float assembly is captivated to the support so that it may move freely in the vertical direction, but is constrained in rotation with respect to the support by compatible asymmetrical structural features. The float assembly includes an element that can be sensed by a sensor assembly that is positioned along the support over the length of the support encompassing the range of fluid levels to be measured.

An omnipolar sensor is provided. The sensor may include a plurality of omnipolar switches disposed adjacent to one another, and a permanent magnet assembly disposed adjacent the plurality of omnipolar switches. The permanent magnet assembly is operable to move axially relative to the plurality of omnipolar switches, wherein the plurality of omnipolar switches are responsive to a magnetic field produced by the permanent magnet assembly, and wherein the permanent magnet axially magnetized.

An omnipolar sensor is provided. The sensor may include a plurality of omnipolar switches disposed adjacent to one another, and a permanent magnet assembly disposed adjacent the plurality of omnipolar switches. The permanent magnet assembly is operable to move axially relative to the plurality of omnipolar switches, wherein the plurality of omnipolar switches are responsive to a magnetic field produced by the permanent magnet assembly, and wherein the permanent magnet axially magnetized.

A system for detecting a characteristic of a fluid. In one example, the system includes a tube, a float, a sensor, and a controller. The tube is configured to receive the fluid. The float is located within the tube. The sensor is configured to sense a position of the float. The controller is configured to receive, from the sensor, the position of the float, and determine a characteristic of the fluid based on the position of the float. The characteristic may be a density or a concentration.

A system for detecting a characteristic of a fluid. In one example, the system includes a tube, a float, a sensor, and a controller. The tube is configured to receive the fluid. The float is located within the tube. The sensor is configured to sense a position of the float. The controller is configured to receive, from the sensor, the position of the float, and determine a characteristic of the fluid based on the position of the float. The characteristic may be a density or a concentration.