A system to measure the flow rate of a liquid in a microfluidic circuit. The system includes a vessel that is partially filled with the liquid, a gaseous ceiling above the vessel and a pressure regulator to maintain the pressure of the gas in the gaseous ceiling at a predetermined value P1. A capillary pipe to extract the liquid from the vessel and to output the liquid at a pressure P2 lower than P1. A first inlet of the pressure sensor is connected to the gaseous ceiling, a second inlet of the pressure sensor is connected to the capillary pipe, and the outlet of the pressure sensor outputs a signal as a function of the pressure difference (P1P2), which is a measurement representing the flow rate of pressurized P2 liquid supplied to the microfluidic circuit.

A system to measure the flow rate of a liquid in a microfluidic circuit. The system includes a vessel that is partially filled with the liquid, a gaseous ceiling above the vessel and a pressure regulator to maintain the pressure of the gas in the gaseous ceiling at a predetermined value P1. A capillary pipe to extract the liquid from the vessel and to output the liquid at a pressure P2 lower than P1. A first inlet of the pressure sensor is connected to the gaseous ceiling, a second inlet of the pressure sensor is connected to the capillary pipe, and the outlet of the pressure sensor outputs a signal as a function of the pressure difference (P1P2), which is a measurement representing the flow rate of pressurized P2 liquid supplied to the microfluidic circuit.

A system for measuring the flow rate in a microfluidic pipe having n pressure sensors arranged in series on a pipe and measuring the pressure Pi of the liquid passing through same. These sensors being separated from one another by pipe portions Ri. Each pipe portion having a hydraulic resistance Rhi, thus making it possible to measure the pressure variations or head loss ?Pi between two consecutive sensors of the liquid flowing successively through these hydraulic resistances. The comparison between the estimated flow rates Di=?Pi/Ri, making it possible to determine the fouling of the microfluidic pipe.

A system for measuring the flow rate in a microfluidic pipe having n pressure sensors arranged in series on a pipe and measuring the pressure Pi of the liquid passing through same. These sensors being separated from one another by pipe portions Ri. Each pipe portion having a hydraulic resistance Rhi, thus making it possible to measure the pressure variations or head loss ?Pi between two consecutive sensors of the liquid flowing successively through these hydraulic resistances. The comparison between the estimated flow rates Di=?Pi/Ri, making it possible to determine the fouling of the microfluidic pipe.

Various methods, apparatuses, and systems for improving sensitivity and performance of a flow sensing apparatus are provided. The flow sensing apparatus includes: a housing defining an inlet port and an outlet port; a sensing element disposed at least partially within the housing; a main flow path defined within the housing connecting the inlet port and the outlet port, where the main flow path is disposed proximate the sensing element such that at least a portion of the flowing media is in fluid contact with the sensing element; and a laminarizing structure located in the inlet port and configured to direct a flowing media in a laminar flow pattern.

Various methods, apparatuses, and systems for improving sensitivity and performance of a flow sensing apparatus are provided. The flow sensing apparatus includes: a housing defining an inlet port and an outlet port; a sensing element disposed at least partially within the housing; a main flow path defined within the housing connecting the inlet port and the outlet port, where the main flow path is disposed proximate the sensing element such that at least a portion of the flowing media is in fluid contact with the sensing element; and a laminarizing structure located in the inlet port and configured to direct a flowing media in a laminar flow pattern.

A system for measuring the flow rate in a microfluidic pipe having n pressure sensors arranged in series on a pipe and measuring the pressure Pi of the liquid passing through same. These sensors being separated from one another by pipe portions Ri. Each pipe portion having a hydraulic resistance Rhi, thus making it possible to measure the pressure variations or head loss Pi between two consecutive sensors of the liquid flowing successively through these hydraulic resistances. The comparison between the estimated flow rates Di=Pi/Ri, making it possible to determine the fouling of the microfluidic pipe.

A system for measuring the flow rate in a microfluidic pipe having n pressure sensors arranged in series on a pipe and measuring the pressure Pi of the liquid passing through same. These sensors being separated from one another by pipe portions Ri. Each pipe portion having a hydraulic resistance Rhi, thus making it possible to measure the pressure variations or head loss Pi between two consecutive sensors of the liquid flowing successively through these hydraulic resistances. The comparison between the estimated flow rates Di=Pi/Ri, making it possible to determine the fouling of the microfluidic pipe.

The disclosed embodiments include a combination absolute pressure and differential pressure transducer that includes at least a first cavity and a second cavity, at least a first pressure port and a second pressure port, a first isolation membrane exposing the first cavity to a first fluid pressure applied to the first pressure port, a second isolation membrane exposing the second cavity to a second fluid pressure applied to the second pressure port, at least one absolute pressure sense element exposed to absolute pressure in one of the first cavity and the second cavity, and at least one differential pressure sense element exposed to differential pressure between two of the first cavity and the second cavity.

The disclosed embodiments include a combination absolute pressure and differential pressure transducer that includes at least a first cavity and a second cavity, at least a first pressure port and a second pressure port, a first isolation membrane exposing the first cavity to a first fluid pressure applied to the first pressure port, a second isolation membrane exposing the second cavity to a second fluid pressure applied to the second pressure port, at least one absolute pressure sense element exposed to absolute pressure in one of the first cavity and the second cavity, and at least one differential pressure sense element exposed to differential pressure between two of the first cavity and the second cavity.