Proposed is a flow sensor (10), in particular for single use, having at least three measurement chambers (11, 15, 19), which are arranged one behind the other and are interconnected in each case by a flow resistance. At least two of the flow resistances have a different coefficient of pressure loss. A pressure measuring means (12, 16, 20) is provided for each measurement chamber, which pressure measuring means (12, 16, 20) is suitable for measuring the pressure in the measurement chamber. An electromagnetically actuatable valve arrangement (50) can be connected downstream of the flow sensor.

Proposed is a flow sensor (10), in particular for single use, having at least three measurement chambers (11, 15, 19), which are arranged one behind the other and are interconnected in each case by a flow resistance. At least two of the flow resistances have a different coefficient of pressure loss. A pressure measuring means (12, 16, 20) is provided for each measurement chamber, which pressure measuring means (12, 16, 20) is suitable for measuring the pressure in the measurement chamber. An electromagnetically actuatable valve arrangement (50) can be connected downstream of the flow sensor.

Disclosed is an infusion pump which may include a native pumping mechanism to drive fluids through a functionally associated conduit, at least one native sensor to sense a physical characteristic of the fluid within the conduit and computing circuitry having a decalibration test mode to determine whether the infusion pump is decalibrated. The computing circuitry may be adapted to receive output from at least one native sensor during the decalibration test mode.

A method and a system of metering flow through a fluid conduit with a fluid obstruction, the method involves: measuring a differential pressure taken between a first conduit position upstream of the fluid obstruction and a second conduit position downstream of the fluid obstruction; calculating a fluid flow rate using the differential pressure measurement; measuring a first static pressure upstream or downstream of the fluid obstruction; measuring a recovered pressure at a recovered pressure location downstream of the fluid obstruction; performing diagnostics based on parameters derived from the differential pressure, the first static pressure; and the measured recovered pressure.

A method and apparatus for determining the flow rates of a multi-component fluid mixture is disclosed. The temperature and pressure of the multi-component mixture is determined. The fractions of the multi-component mixture are determined based on at least two measured physical properties of the mixture and knowledge of the same physical property of the individual components. The velocity of the multi component mixture is determined. The flow rate of the individual component of the fluid is determined. An electromagnetic measurement is performed. A statistical parameter related to the electromagnetic measurement is calculated and compared to an empirical derived threshold value corresponding to the value of the statistical parameter when only one of the components of the multi component mixture is present. The thickness of unwanted deposits on the pipe wall is determined and an improved flow rate determination of the individual components of the fluid is obtained.

A method and apparatus for determining the flow rates of a multi-component fluid mixture is disclosed. The temperature and pressure of the multi-component mixture is determined. The fractions of the multi-component mixture are determined based on at least two measured physical properties of the mixture and knowledge of the same physical property of the individual components. The velocity of the multi component mixture is determined. The flow rate of the individual component of the fluid is determined. An electromagnetic measurement is performed. A statistical parameter related to the electromagnetic measurement is calculated and compared to an empirical derived threshold value corresponding to the value of the statistical parameter when only one of the components of the multi component mixture is present. The thickness of unwanted deposits on the pipe wall is determined and an improved flow rate determination of the individual components of the fluid is obtained.

A self-correcting pressure-based mass flow control apparatus includes outlet pressure sensing to enable correction for non-ideal operating conditions. Further the mass flow control apparatus having a fluid pathway, a shutoff valve in the fluid pathway, a reference volume in the fluid pathway, a first pressure measuring sensor in fluid communication with the reference volume, a first temperature measuring sensor providing a temperature signal indicative of the fluid temperature within the reference volume, a proportional valve in the fluid pathway, and a second pressure measuring sensor in fluid communication with the fluid pathway.

A self-correcting pressure-based mass flow control apparatus includes outlet pressure sensing to enable correction for non-ideal operating conditions. Further the mass flow control apparatus having a fluid pathway, a shutoff valve in the fluid pathway, a reference volume in the fluid pathway, a first pressure measuring sensor in fluid communication with the reference volume, a first temperature measuring sensor providing a temperature signal indicative of the fluid temperature within the reference volume, a proportional valve in the fluid pathway, and a second pressure measuring sensor in fluid communication with the fluid pathway.

Calibrating a plurality of fluid sensors of a remote metering system is disclosed. The system includes a material supply device including a main pump and a main flow sensor for monitoring an output of the main pump. The application system also includes a remote metering system for receiving the material flowing from the material supply device and applying the material to substrates. The remote metering system includes a first applicator assembly including a first applicator and a first flow sensor for monitoring an output of the first applicator, and a second applicator assembly including a second applicator and a second flow sensor for monitoring an output of the second applicator. The remote metering system further includes a controller in signal communication with the remote metering station and the material supply device. The controller performs a first and second calibration operations on the first and second flow sensors, respectively.

Calibrating a plurality of fluid sensors of a remote metering system is disclosed. The system includes a material supply device including a main pump and a main flow sensor for monitoring an output of the main pump. The application system also includes a remote metering system for receiving the material flowing from the material supply device and applying the material to substrates. The remote metering system includes a first applicator assembly including a first applicator and a first flow sensor for monitoring an output of the first applicator, and a second applicator assembly including a second applicator and a second flow sensor for monitoring an output of the second applicator. The remote metering system further includes a controller in signal communication with the remote metering station and the material supply device. The controller performs a first and second calibration operations on the first and second flow sensors, respectively.