A universal sensor interface system includes a sensor assembly and an adapter with twist to lock and twist to unlock functionality. The sensor assembly has a sensor interface box and a transducer communicatively connected to the sensor interface box by a cable. The adapter is configured to connect to an access aperture of a container for holding a fluid. The sensor interface box has a first connection interface, and the adapter has a complementary second connection interface. The first connection interface and the second connection interface cooperate to facilitate connection of the sensor assembly to the access aperture of the container and disconnection of the sensor assembly from the access aperture of the container.

A level indicating device for a tank includes: a differential pressure type level gauge configured to measure a level of a fluid in a tank on the basis of a pressure according to the level of the fluid in the tank; and a level indicator configured to indicate the level of the fluid by moving in a vertical direction according to a differential pressure signal measured by the differential pressure type level gauge.

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.

Systems and methods may be provided for monitoring a fuel level of a vehicle. The fuel may be a gaseous fuel, such as natural gas. An electronic control unit may be able to receive a signal from one or more sensors. The electronic control unit may provide a command to drive a fuel gauge to display the fuel level. The electronic control unit may determine the gauge command based on the received signal and a filling compensation scheme. The electronic control unit may be initialized through a user interface. A filling compensation scheme may be selected during initialization. The electronic control unit may be capable of communicating various sensors, gauges, devices, controls and/or other ECUs of varying specifications.

Systems and methods may be provided for monitoring a fuel level of a vehicle. The fuel may be a gaseous fuel, such as natural gas. An electronic control unit may be able to receive a signal from one or more sensors. The electronic control unit may provide a command to drive a fuel gauge to display the fuel level. The electronic control unit may determine the gauge command based on the received signal and a filling compensation scheme. The electronic control unit may be initialized through a user interface. A filling compensation scheme may be selected during initialization. The electronic control unit may be capable of communicating various sensors, gauges, devices, controls and/or other ECUs of varying specifications.

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 device includes: an outer case; an inner case; a cylindrical base having a distal end that penetrates through a cylinder of the outer case to be fixed to the outer case; and a fastener configured to be mounted on the distal end of the base, the fastener including: an exterior configured to be guided by a guide provided to the inner case; a fastener-side engaging portion engageable with the inner case; and a contact peripheral portion configured to be contact with the outer case to prevent the inner case from rotating relative to the outer case.

A device includes: an outer case; an inner case; a cylindrical base having a distal end that penetrates through a cylinder of the outer case to be fixed to the outer case; and a fastener configured to be mounted on the distal end of the base, the fastener including: an exterior configured to be guided by a guide provided to the inner case; a fastener-side engaging portion engageable with the inner case; and a contact peripheral portion configured to be contact with the outer case to prevent the inner case from rotating relative to the outer case.

The present disclosure reveals a level indicator for use with storage tanks on recreational vehicles, where recreational vehicles include but are not limited to recreational vehicles, recreational trailers, buses, airplanes, or boats. The level indicator comprises a sensor attached to the bottom of a storage tank where the sensor is calibrated to indicate the amount of liquid above the sensor in the tank. As the level of the tank changes, a readout meter indicates the volume of liquid present by percentage.