A no emission tank gauge has a housing having a valve connection extending from a bottom side of the housing, a gauge line within the housing, the gauge line having a plumb bob attached at a free end, a pulley attached within the housing and supporting the gauge line, the pulley configured to allow extension and retraction of the gauge line, and an actuator connected to the pulley and extending exterior to the housing and configured to actuate the extension and retraction of the gauge line via rotation of the pulley. The housing has a window in a wall of the housing facing a marked side of the gauge line. The valve connection has an opening sized to allow for passage of the plumb bob and the gauge line. The housing is sealed when the valve connection is connected to a valve to prevent escape of fluid.

A fluid sensor system comprises a radio frequency transmitter with adjustable output power, a radio frequency detector proximal to the radio frequency transmitter; a constant current source, and a switch coupled between the radio frequency detector and the constant current source. A method of determining the identity of a fluid using the fluid sensor system includes immersing the sensor system in a first fluid, increasing a transmit power of a radio frequency (RF) transmitter of the fluid sensor system until an RF signal is detected by a RF detector of the fluid sensor system, and determining the transmit power of the RF transmitter that first resulted in a detection of the RF signal by the RF detector to be the transmit power that is required for detecting the RF signal in the first fluid.

A fluid sensor system comprises a radio frequency transmitter with adjustable output power, a radio frequency detector proximal to the radio frequency transmitter; a constant current source, and a switch coupled between the radio frequency detector and the constant current source. A method of determining the identity of a fluid using the fluid sensor system includes immersing the sensor system in a first fluid, increasing a transmit power of a radio frequency (RF) transmitter of the fluid sensor system until an RF signal is detected by a RF detector of the fluid sensor system, and determining the transmit power of the RF transmitter that first resulted in a detection of the RF signal by the RF detector to be the transmit power that is required for detecting the RF signal in the first fluid.

A vehicle liquid testing system includes a liquid testing apparatus with a form factor of a dipstick. The system includes a sensor that detects a property of a fluid in a vehicle and emits a signal indicative of the property. A transmitter receives the signal from the sensor and transmits the signal. A controller receives the signal from the transmitter and compares the signal from the sensor to a threshold level to determine a condition of the fluid.

A vehicle liquid testing system includes a liquid testing apparatus with a form factor of a dipstick. The system includes a sensor that detects a property of a fluid in a vehicle and emits a signal indicative of the property. A transmitter receives the signal from the sensor and transmits the signal. A controller receives the signal from the transmitter and compares the signal from the sensor to a threshold level to determine a condition of the fluid.

A fluid port assembly includes a tube configured for positioning with a fluid container to provide access to a fluid contained in the fluid container. The tube includes at least one annular tube recess. The at least one annular tube recess forms a plurality of inner tube surfaces extending circumferentially within the tube. The assembly includes a plug configured for positioning inside the tube to releasably seal the fluid container and contain the fluid within the fluid container. The plug includes at least one annular plug protrusion, and the at least one annular plug protrusion forms a plurality of outer plug surfaces extending circumferentially around the plug. The plurality of inner tube surfaces of the tube interfaces with the plurality of outer plug surfaces of the plug to seal the fluid container.

A fluid port assembly includes a tube configured for positioning with a fluid container to provide access to a fluid contained in the fluid container. The tube includes at least one annular tube recess. The at least one annular tube recess forms a plurality of inner tube surfaces extending circumferentially within the tube. The assembly includes a plug configured for positioning inside the tube to releasably seal the fluid container and contain the fluid within the fluid container. The plug includes at least one annular plug protrusion, and the at least one annular plug protrusion forms a plurality of outer plug surfaces extending circumferentially around the plug. The plurality of inner tube surfaces of the tube interfaces with the plurality of outer plug surfaces of the plug to seal the fluid container.

The invention relates to an apparatus (14) for handling and/or measuring a liquid contained in a container (10), the apparatus (14) comprising an elongate component (18) having a free end (20) and being insertable through a container opening (12) of the container (10) into the interior (22) of the container (10) with said free end (20) first and at least a part of an empty level indicator system (28, 30, 32) at the free end (20) of the elongate component (18), wherein said part is a transponder (28) for an RF-detection system (28, 30) of the empty level indicator system (28, 30, 32). The invention further relates to a corresponding empty level indicator system (28, 30, 32) for detecting an empty level of a liquid in at least one container (10).

A fluid sensor system comprises a radio frequency transmitter with adjustable output power, a radio frequency detector proximal to the radio frequency transmitter; a constant current source, and a switch coupled between the radio frequency detector and the constant current source. A method of determining the identity of a fluid using the fluid sensor system includes immersing the sensor system in a first fluid, increasing a transmit power of a radio frequency (RF) transmitter of the fluid sensor system until an RF signal is detected by a RF detector of the fluid sensor system, and determining the transmit power of the RF transmitter that first resulted in a detection of the RF signal by the RF detector to be the transmit power that is required for detecting the RF signal in the first fluid.

A fluid sensor system comprises a radio frequency transmitter with adjustable output power, a radio frequency detector proximal to the radio frequency transmitter; a constant current source, and a switch coupled between the radio frequency detector and the constant current source. A method of determining the identity of a fluid using the fluid sensor system includes immersing the sensor system in a first fluid, increasing a transmit power of a radio frequency (RF) transmitter of the fluid sensor system until an RF signal is detected by a RF detector of the fluid sensor system, and determining the transmit power of the RF transmitter that first resulted in a detection of the RF signal by the RF detector to be the transmit power that is required for detecting the RF signal in the first fluid.