A device for determining the viscosity of reaction resins is provided. The device includes a sample storage unit with at least two storage containers and respectively a dosing unit, at least one mixing device, a high pressure pump, a temperature-control unit, and at least one capillary with an inlet and an outlet. A pressure measuring device is arranged at least on each capillary's outlet and on the inlet of the first capillary.

The invention relates to a measuring nozzle for determining the extensional viscosity of polymer melts during their processing, comprising a flow channel which has a rectangular cross-section and which has a transitional section (3) between an inlet section (1) and an outlet section (2) with respective constant cross-section, which transitional section tapers hyperbolically in the flow direction (8) between two mutually opposite channel walls (6 and 7). In order to provide advantageous measuring conditions it is proposed that the transitional section (3) comprises an inlet-side zone (4) in which the mutual distance of the two channel walls (7) between the two hyperbolic channel walls (6) decreases continuously in the direction of flow (8), and an outlet-side zone (5) which adjoins the inlet-side zone and in which two of the channel walls (6, 7) disposed opposite one another in pairs extend parallel to one another, while the two channel walls (7) arranged therebetween converge hyperbolically in the flow direction (8).

The invention relates to a measuring nozzle for determining the extensional viscosity of polymer melts during their processing, comprising a flow channel which has a rectangular cross-section and which has a transitional section (3) between an inlet section (1) and an outlet section (2) with respective constant cross-section, which transitional section tapers hyperbolically in the flow direction (8) between two mutually opposite channel walls (6 and 7). In order to provide advantageous measuring conditions it is proposed that the transitional section (3) comprises an inlet-side zone (4) in which the mutual distance of the two channel walls (7) between the two hyperbolic channel walls (6) decreases continuously in the direction of flow (8), and an outlet-side zone (5) which adjoins the inlet-side zone and in which two of the channel walls (6, 7) disposed opposite one another in pairs extend parallel to one another, while the two channel walls (7) arranged therebetween converge hyperbolically in the flow direction (8).

A device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: a conduit (200), for supplying the print head (50), this conduit being provided with a 1.sup.st pressure (Pin) sensor (26) at a first end and a 2.sup.nd pressure (PHead) sensor (56) at a 2.sup.nd end, circuit or controller (26, 56) for measuring at least the pressure (PHead) of the 2.sup.nd pressure sensor (56) and the pressure difference (PinPHead) between the 1.sup.st pressure sensor (26) and the 2.sup.nd pressure sensor (56).

A device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: a conduit (200), for supplying the print head (50), this conduit being provided with a 1.sup.st pressure (Pin) sensor (26) at a first end and a 2.sup.nd pressure (PHead) sensor (56) at a 2.sup.nd end, circuit or controller (26, 56) for measuring at least the pressure (PHead) of the 2.sup.nd pressure sensor (56) and the pressure difference (PinPHead) between the 1.sup.st pressure sensor (26) and the 2.sup.nd pressure sensor (56).

Aspiration of a pipette arrangement is initiated. A sensor arrangement senses a least one prevailing first parameter that is dependent from the effect in the pipette arrangement during initiating and upholding the suctioning action. This at least one parameter is analyzed in an analyzing stage. From a result of this analysis and in a determining stage at least one test criterium TC for at least one further parameter as sensed by the sensor arrangement is determined. In a checking stage there is checked whether this further parameter fulfills the at least one test criterium.

The invention discloses a method for correcting differential pressure values of a fire extinguishing agent concentration analyzer in the engine compartment of an aircraft, the analyzer, and a readable storage media thereof. The method includes: correcting theoretical differential pressure values of the analyzer; measuring actual differential pressure values of the analyzer under different pressure; obtaining a series of corrected viscosity coefficients accordingly; obtaining a relation accordingly; setting a corrected model to replace the original model of the analyzer. It is solved for the problem that the noise influence caused by the pressure of flight environment cannot be overcome in the test of extinguishing agent concentration in aircraft engine compartment.

The invention discloses a method for correcting differential pressure values of a fire extinguishing agent concentration analyzer in the engine compartment of an aircraft, the analyzer, and a readable storage media thereof. The method includes: correcting theoretical differential pressure values of the analyzer; measuring actual differential pressure values of the analyzer under different pressure; obtaining a series of corrected viscosity coefficients accordingly; obtaining a relation accordingly; setting a corrected model to replace the original model of the analyzer. It is solved for the problem that the noise influence caused by the pressure of flight environment cannot be overcome in the test of extinguishing agent concentration in aircraft engine compartment.

A test method and test apparatus is provided that employs a microfluidic device to characterize properties of a fluid. The microfluidic device has a first inlet port, an outlet port, and a microchannel as part of a fluid path between the first inlet port and the outlet port. While generating a flow of the fluid through the microchannel of the microfluidic device, fluid pressure at the first inlet port of the microfluidic device is measured and recorded in conjunction with varying the controlled temperature of the microchannel of the microfluidic device to characterize the properties of the fluid that flows through the microchannel of the microfluidic device. The properties of the fluid can relate to the clathrate hydrate formation condition of the fluid at the pressure of the flow through the microchannel of the microfluidic device.

A test method and test apparatus is provided that employs a microfluidic device to characterize properties of a fluid. The microfluidic device has a first inlet port, an outlet port, and a microchannel as part of a fluid path between the first inlet port and the outlet port. While generating a flow of the fluid through the microchannel of the microfluidic device, fluid pressure at the first inlet port of the microfluidic device is measured and recorded in conjunction with varying the controlled temperature of the microchannel of the microfluidic device to characterize the properties of the fluid that flows through the microchannel of the microfluidic device. The properties of the fluid can relate to the clathrate hydrate formation condition of the fluid at the pressure of the flow through the microchannel of the microfluidic device.