A method for controlling a hydrodynamic machine, including the steps of: providing a hydrodynamic machine which includes a bladed primary wheel and a bladed secondary wheel, which together form a working chamber, which can be filled with a working medium from a working medium supply contained in a working medium reservoir, to transfer drive power hydrodynamically from the bladed primary wheel to the bladed secondary wheel by forming a working medium circuit in the working chamber; applying a control pressure to the working medium supply in order to force the working medium from the working medium supply into the working chamber; detecting, at least indirectly, a pressure increase in the working medium reservoir, when the control pressure is applied to the working medium supply; and determining, as a function of the pressure increase that has been detected, a fill level of the working medium supply in the working medium reservoir.

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 vertical tubular defines a measurement chamber. A first valve is nearer an upper end of the vertical tubular than a lower end of the vertical tubular. The first valve defines a first actuable passage fluidically connected to the measuring chamber. A second is valve nearer the lower end of the vertical tubular than the upper end of the vertical tubular. The second valve defines a second actuable passage fluidically connected to the measuring chamber. A third valve is vertically aligned with the first valve. The third valve is on an opposite side of the vertical tubular from the first valve. The third valve defines a third actuable passage fluidically connected to the measuring chamber. The fourth valve defines a fourth actuable passage fluidically connected to the measuring chamber. A flange is each end of the vertical tubular.

An automatic swimming pool cleaner (APC) for swimming pools and spas may be used to monitor and/or determine a waterline level of the swimming pool or spa. Optionally, the determined waterline level may be provided on a user interface of an external device such as but not limited to a control box or a user device. An alert may be provided to a pool owner or other user based on the waterline level relative to a threshold waterline level. Optionally, at least one piece of equipment associated with the swimming pool or spa may be controlled based on the determined waterline level.

A pressure sensor system for determining fluid level in a tank, includes a pressure sensor constructed to exhibit a force value corresponding to a sensed force, and a computer operatively coupled to the pressure sensor. A tank containing fluid is also includes and there is a communication link between the pressure sensor and the tank, thereby allowing determination of the level of fluid in the tank by calibration and interpretation of the force value exhibited by the pressure sensor.

A tank fill control apparatus comprising: a tank-installed switch, including: a tubular body including an upper end, a lower end, and an annular mounting flange on an outer surface between the upper end and the lower end; a liquid level sensor including a detector, a float in and moveable along a length of the lower end and a rod connecting the float to the detector, the liquid level sensor configured to sense a liquid level relative to the lower end and further configured to generate a signal when at least a maximum selected liquid level is sensed; and a control unit in communication with the tank-installed switch including: a liquid level monitoring function for receiving the signal from the liquid level sensor; and a control function for generating at least one of (i) an alert signal indicating that the maximum selected liquid level is sensed and (ii) a valve control to modify a fill operation from a tank fill system.

A blocked sewer unit includes a substantially impermeable barrier having a first side exposed to the interior of a sewage network and a second side, the barrier movable in the direction of the second side in response to fluid pressure on the first side. The blocked sewer alert unit includes a transducer separated by the barrier from the sewage network, the transducer configured to generate an electrical signal when the barrier moves into the dry section. The blocked sewer alert unit includes an alarm circuit configured to convert the electrical signal into a user alert.

Systems and methods of the present disclosure include a vehicle water detection system that includes a housing configured to be disposed within a vehicle. The vehicle water detection system also includes a water-activated battery disposed within the housing and configured to produce an electrical voltage upon contact with water. The vehicle water detection system further includes an electronic circuitry disposed within the housing and configured to detect a water event occurring in the vehicle based at least in part on the electrical voltage.

The sensor device serves for detecting the absence or presence of a liquid (1) at the outlet (10a) of a feed line (10) through which there can be fed a feed substance which, when exiting from the outlet, has a pressure (p) in the feed line which has a course over time with a first characteristic in the absence of the liquid and has a course over time with a second characteristic in the presence of the liquid. The sensor device includes a sensing instrument (20-23) for sensing the pressure fluctuations in the feed line (10) and evaluator (30) which is designed to assign the sensed pressure fluctuations to the first or second characteristic and to generate a corresponding signal which indicates whether the liquid (1) is absent or present at the feed line outlet (10a).

The present invention concerns a calculation method (1000) for the positioning of sensors for measuring an odorant gas in a natural gas network (2000), comprising the steps of: acquisition (1010) of data representing the physical state of the natural gas network (2000), simulation (1020) of the natural gas network (2000), calculation (1030) of the position of odorant gas sensors.