Abstract: Systems, methods and computer readable media are provided for measuring fluid level in a tank. A system may include: a transmitter gauge installed on or in the tank, the transmitter gauge comprising a probe arranged to be at least partially immersed in the fluid and adapted to conduct energy pulses generated by an energy source within the transmitter gauge; a refractometer module operatively coupled to the transmitter gauge, the refractometer module comprising a processor configured to measure travel times of the energy pulses conducted along the probe and to determine the fluid level in the tank based on the measured travel times: if the fluid level in the tank is below a threshold level, according to a first mode of operation, by determining the fluid level in the tank based on the measured travel time of an energy pulse reflected from a terminal end of the probe, a length of the probe, a speed of the reflected energy pulse in air, and a speed of the reflected energy pulse in the liquid.

Abstract: Systems, methods and computer readable media are provided for measuring fluid level in a tank. A system may include: a transmitter gauge installed on or in the tank, the transmitter gauge comprising a probe arranged to be at least partially immersed in the fluid and adapted to conduct energy pulses generated by an energy source within the transmitter gauge; a refractometer module operatively coupled to the transmitter gauge, the refractometer module comprising a processor configured to measure travel times of the energy pulses conducted along the probe and to determine the fluid level in the tank based on the measured travel times: if the fluid level in the tank is below a threshold level, according to a first mode of operation, by determining the fluid level in the tank based on the measured travel time of an energy pulse reflected from a terminal end of the probe, a length of the probe, a speed of the reflected energy pulse in air, and a speed of the reflected energy pulse in the liquid.

Abstract: A system and method to determine linear and approximate rotational position of a reciprocating and rotating hydraulic cylinder. The system uses two magnetic rings offset a distance, each ring having a continuous arc of magnetic material terminating in a blind zone, where the blind zone produces a magnetic field substantially different from the continuous arc region. The magnetic fields are used to detect location and rotation by an magnetic sensor that interacts with the magnets and blind zone.