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.

Fluid supply, monitoring and control system from LPG supply vehicles to tank trucks, the vehicle has a LPG liquid level gauger, an output line over which it is located in a fluid way a solenoid valve which allows or cuts the LPG flow besides of a flowmeter which measures the amount that flows through the said output line, a fluid coupled hose to the said output line with a connector which allows to safely couple to a stationary tank; the system also includes the use of a mobile computer device, a central that has at least one desktop computer device connected to a WIFI data network of mobile phone data network with which it communicates with the mobile device. The said level gauge is electronically coupled to a first manager which includes an electronic card, a processor, as well as the first antenna which allows to send data via Bluetooth to the mobile computer device; the said solenoid valve is electronically coupled to a second manager which includes an electronic card, a processor, energizing means or to re-energize the solenoid valve as well as a second antenna which allows to receive and send data via Bluetooth to the mobile computer device; besides, the said flowmeter is electronically coupled to a third manager which includes an electronic card, a processor, as well as a third antenna which allows to send data via Bluetooth to the mobile computer device; where the mobile computer device receives information from the level gauge and flowmeter which compares at all times when LPG is been delivered, can also send the encrypted instruction to open or close the solenoid valve, according to the collates of the data received from the sensors and the geographical location of the mobile computer device.

Fluid supply, monitoring and control system from LPG supply vehicles to tank trucks, the vehicle has a LPG liquid level gauger, an output line over which it is located in a fluid way a solenoid valve which allows or cuts the LPG flow besides of a flowmeter which measures the amount that flows through the said output line, a fluid coupled hose to the said output line with a connector which allows to safely couple to a stationary tank; the system also includes the use of a mobile computer device, a central that has at least one desktop computer device connected to a WIFI data network of mobile phone data network with which it communicates with the mobile device. The said level gauge is electronically coupled to a first manager which includes an electronic card, a processor, as well as the first antenna which allows to send data via Bluetooth to the mobile computer device; the said solenoid valve is electronically coupled to a second manager which includes an electronic card, a processor, energizing means or to re-energize the solenoid valve as well as a second antenna which allows to receive and send data via Bluetooth to the mobile computer device; besides, the said flowmeter is electronically coupled to a third manager which includes an electronic card, a processor, as well as a third antenna which allows to send data via Bluetooth to the mobile computer device; where the mobile computer device receives information from the level gauge and flowmeter which compares at all times when LPG is been delivered, can also send the encrypted instruction to open or close the solenoid valve, according to the collates of the data received from the sensors and the geographical location of the mobile computer device.

A fire suppressant storage device (20) comprises: a tank (22) having a first port (40), a second port (70), and an interior (32) for storing fire suppressant. A discharge assembly (46) is mounted to the first port and comprises: a discharge valve (48); and a discharge conduit (50). The discharge conduit is at least partially within the interior and has an interior and an exterior. A liquid level measurement assembly is mounted to the second port and comprises: a tube (100) at least partially within the interior and having: an exterior and an interior sealed relative to the surrounding tank interior. A float (120) surrounds the tube and has one or more magnets (130) and having a range of motion. A plurality of magnetic field sensors (152, 154) are along a carrier (150) within the tube interior. The carrier extends from a proximal end to a distal end. The plurality of magnetic field sensors (152, 154) comprise: a first plurality of one dimensional sensors (152); and at least two three-dimensional sensors distally of the first plurality (154)

A fire suppressant storage device (20) comprises: a tank (22) having a first port (40), a second port (70), and an interior (32) for storing fire suppressant. A discharge assembly (46) is mounted to the first port and comprises: a discharge valve (48); and a discharge conduit (50). The discharge conduit is at least partially within the interior and has an interior and an exterior. A liquid level measurement assembly is mounted to the second port and comprises: a tube (100) at least partially within the interior and having: an exterior and an interior sealed relative to the surrounding tank interior. A float (120) surrounds the tube and has one or more magnets (130) and having a range of motion. A plurality of magnetic field sensors (152, 154) are along a carrier (150) within the tube interior. The carrier extends from a proximal end to a distal end. The plurality of magnetic field sensors (152, 154) comprise: a first plurality of one dimensional sensors (152); and at least two three-dimensional sensors distally of the first plurality (154)

A filling level indicator for determining a filling level in a tank, having a resistor network, a contact element, and a magnetic element. The contact element is spaced apart from the resistor network, and the magnetic element is movable relative to the resistor network and the contact element. The contact element has a contact region deflectable by the magnetic element. An electrically conductive connection between the contact region and the resistor network can be established by the deflection of the contact region. A spacer element is disposed between the contact element and the resistor network. A predefinable spacing is generated by the spacer element, which is formed from a fuel-resistant material.

A digital liquid-level sensor comprises a non-magnetic conduit, a floater provided outside the non-magnetic conduit and capable of axially moving along the non-magnetic conduit, and a permanent magnet fixed on the floater. The non-magnetic conduit further comprises a switch unit and an encoding unit. The switch unit comprises at least one tunneling magnetoresistance switch which is turned on or turned off under the effect of the magnetic field produced by the permanent magnet; and the encoding unit comprises at least one encoder, of which an input end receives an on/off signal from the tunneling magnetoresistance switch and outputs a digital signal indicating the position of the floater. The digital liquid-level sensor is of a small size; has low cost, low power consumption, high reliability, high sensitivity, high solution, long service life, and a good anti-interference capability; and can directly output the digital signal.

A digital liquid-level sensor comprises a non-magnetic conduit, a floater provided outside the non-magnetic conduit and capable of axially moving along the non-magnetic conduit, and a permanent magnet fixed on the floater. The non-magnetic conduit further comprises a switch unit and an encoding unit. The switch unit comprises at least one tunneling magnetoresistance switch which is turned on or turned off under the effect of the magnetic field produced by the permanent magnet; and the encoding unit comprises at least one encoder, of which an input end receives an on/off signal from the tunneling magnetoresistance switch and outputs a digital signal indicating the position of the floater. The digital liquid-level sensor is of a small size; has low cost, low power consumption, high reliability, high sensitivity, high solution, long service life, and a good anti-interference capability; and can directly output the digital signal.

In multiple magnetic sensors, for a correlation function between a magnetic field applied from a magnet and a value of the magnetic field detected by the magnetic sensor at a first temperature, the value detected by the magnetic sensor when the magnetic field applied from the magnet is 0 is set to be a first offset value. For a correlation function between a magnetic field applied from the magnet and a value of the magnetic field detected by the magnetic sensor at a second temperature, the value detected by the magnetic sensor when the magnetic field applied from the magnet is 0 is set to be a second offset value. The second temperature is higher than the first temperature. A values of applied magnetic fields detected by first and second magnetic sensors are opposite in polarity.