The present invention is directed to methods of improving accuracy of droplet metering using at least one on-actuator reservoir as the fluid input. In some embodiments, the on-actuator reservoir that is used for metering droplets includes a loading port, a liquid storage zone, a droplet metering zone, and a droplet dispensing zone. The on-actuator reservoirs are designed to prevent liquid flow-back into the loading port and to prevent liquid from flooding into the droplet operations gap in the dispensing zone.

A system for externally monitoring a tank level is provided. The system includes a tank monitoring computer device and at least one sensor array. The at least one sensor array includes a plurality of sensors and a plurality of fasteners. The at least one sensor array is configured to be attached to a tank by the plurality of fasteners. The tank monitoring computer device is in communication with the at least one sensor array. The tank monitoring computer device is programmed to a) receive a plurality of sensor readings from the plurality of sensors associated with the at least one sensor array, b) calculate a first tank level using a first method, c) calculate a second tank level using a second method, d) compare the first tank level to the second tank level to determine a final tank level, and e) report the final tank level.

A method for mitigating water invasion to a submersible motor includes: forming an accumulation zone within an inner space of the submersible motor, wherein the accumulation zone is disposed at a bottom of the inner space below a motor shaft; measuring a conductivity of a fluid inside the accumulation zone using a sensor, wherein the fluid comprises water and dielectric oil; comparing the conductivity of the fluid with a threshold value; upon detecting that the conductivity of the fluid is greater than the threshold value, activating a solenoid pump to discharge the fluid from the accumulation zone to an outside of the submersible motor.

A method for mitigating water invasion to a submersible motor includes: forming an accumulation zone within an inner space of the submersible motor, wherein the accumulation zone is disposed at a bottom of the inner space below a motor shaft; measuring a conductivity of a fluid inside the accumulation zone using a sensor, wherein the fluid comprises water and dielectric oil; comparing the conductivity of the fluid with a threshold value; upon detecting that the conductivity of the fluid is greater than the threshold value, activating a solenoid pump to discharge the fluid from the accumulation zone to an outside of the submersible motor.

A system includes a conduit, a sensor system and a controller. The conduit may be associated with a structure, having a portion thereof disposed on a surface, and being disposed in a direction normal to the surface. The controller is in communication with the sensor component. When the sensor system is operable to detect when sediment on the surface and surrounding the structure is removed from an area around the structure, an initial length, l.sub.i, of the conduit is disposed below the surface of the sediment on the surface and surrounding the structure at an initial time. When the sensor system is operable to detect when sediment is deposited around the structure, the initial length, l.sub.i, of the conduit is disposed above the surface at the initial time.

A system includes a conduit, a sensor system and a controller. The conduit may be associated with a structure, having a portion thereof disposed on a surface, and being disposed in a direction normal to the surface. The controller is in communication with the sensor component. When the sensor system is operable to detect when sediment on the surface and surrounding the structure is removed from an area around the structure, an initial length, l.sub.i, of the conduit is disposed below the surface of the sediment on the surface and surrounding the structure at an initial time. When the sensor system is operable to detect when sediment is deposited around the structure, the initial length, l.sub.i, of the conduit is disposed above the surface at the initial time.

A diode voltage measurement system can include a plurality of diodes connected in series along a single line. The plurality of diodes can include N diodes. The system can include a plurality of capacitors for at least N−1 of the diodes. Each capacitor can be connected in parallel to the single line with a respective diode to form a respective diode-capacitor (DC) pair. Each DC pair can be configured such that each DC pair reaches a steady state voltage at a different time. The system can include a current supply connected to the single line to supply a current to the line. The system can include a control module configured to sense a total voltage across the single line and to successively determine voltage of each diode from the total voltage based on the current, a known total steady state voltage, and known time-to-steady-state-voltages of each DC pair and/or diode.

The present disclosure is directed towards a compact, modular infusion pump and a delivery mechanism for accurate dispensing of very small amounts of medication. The infusion pump comprises a tubular, curved medication reservoir, and a flexible, one-piece drive train configured to push very small amounts of medication out of the medication reservoir. A method of measuring a level of medication inside the medication reservoir or cross-checking the accuracy of medication delivery is also described.

The present disclosure is directed towards a compact, modular infusion pump and a delivery mechanism for accurate dispensing of very small amounts of medication. The infusion pump comprises a tubular, curved medication reservoir, and a flexible, one-piece drive train configured to push very small amounts of medication out of the medication reservoir. A method of measuring a level of medication inside the medication reservoir or cross-checking the accuracy of medication delivery is also described.

There is described an apparatus for determining a level of a liquid to be contained in a container, comprising: a body extending along a longitudinal axis, the body being insertable within the container; and a level sensor unit secured to the body for detecting the level of the liquid along the longitudinal axis of the body.