In a measuring method for measuring the viscosity of an essentially non-compressible measuring medium (F) with a measuring device (1) comprising a first container (2), wherein the measuring medium (F) can leak from the first container (2) via a capillary (11) which, in an operating position, is arranged at a certain capillary angle () toward the horizontal, preferably perpendicularly, via an outlet opening (13) of the capillary (11), the measuring medium (F) is introduced, in a first process step, into the first container (2) filled with a compressible medium, in particular ambient air (L), whereupon the measuring medium (F) occupies a partial volume (V.sub.F0) of the total volume (V.sub.0) of the first container (2), wherein, in a second process step, a first pressure difference (p.sub.1), which is kept constant, and, respectively, a second pressure difference (p.sub.2), which is kept constant, or a pressure difference p(t)), which decreases over time, are adjusted between a pressure (p.sub.1 or, respectively, p.sub.2; p(t)) of the compressible medium (L) in the first container (2) and a pressure (p.sub.0) of the compressible medium (L) at the outlet opening (13) of the capillary (11), wherein, in a third process step, the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit is determined for the first pressure difference (p.sub.1), which is kept constant, and the second pressure difference (p.sub.2), which is kept constant, or for a first pressure difference (p(t)), which decreases as a result of the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F), in order to determine at least two measurement points of the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit over the pressure difference (p) as a resulting straight line (14) in a coordinate system, wherein, in a final process step, the kinematic viscosity () is determined from the value (15) of the resulting straight line (14) for the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit at the pressure difference of p=0 and the dynamic viscosity () of the measuring medium (F) is determined from the slope of the resulting straight line (14).

In a measuring method for measuring the viscosity of an essentially non-compressible measuring medium (F) with a measuring device (1) comprising a first container (2), wherein the measuring medium (F) can leak from the first container (2) via a capillary (11) which, in an operating position, is arranged at a certain capillary angle () toward the horizontal, preferably perpendicularly, via an outlet opening (13) of the capillary (11), the measuring medium (F) is introduced, in a first process step, into the first container (2) filled with a compressible medium, in particular ambient air (L), whereupon the measuring medium (F) occupies a partial volume (V.sub.F0) of the total volume (V.sub.0) of the first container (2), wherein, in a second process step, a first pressure difference (p.sub.1), which is kept constant, and, respectively, a second pressure difference (p.sub.2), which is kept constant, or a pressure difference p(t)), which decreases over time, are adjusted between a pressure (p.sub.1 or, respectively, p.sub.2; p(t)) of the compressible medium (L) in the first container (2) and a pressure (p.sub.0) of the compressible medium (L) at the outlet opening (13) of the capillary (11), wherein, in a third process step, the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit is determined for the first pressure difference (p.sub.1), which is kept constant, and the second pressure difference (p.sub.2), which is kept constant, or for a first pressure difference (p(t)), which decreases as a result of the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F), in order to determine at least two measurement points of the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit over the pressure difference (p) as a resulting straight line (14) in a coordinate system, wherein, in a final process step, the kinematic viscosity () is determined from the value (15) of the resulting straight line (14) for the decrease in volume (dV.sub.F(t)/dt) of the measuring medium (F) per time unit at the pressure difference of p=0 and the dynamic viscosity () of the measuring medium (F) is determined from the slope of the resulting straight line (14).

An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancelation of the confounding effects of pump pulses in a capillary bridge viscometer.

An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancelation of the confounding effects of pump pulses in a capillary bridge viscometer.

Embodiments of the present invention can be implemented to (i) verify that a liquid within a turbidity measuring device during an assay process is of the same origin of that upon which the assay was performed, (ii) verify a flow through the turbidity measuring device including, but not limited to, a turbidimeter, a nephelometer, a fluorimeter, or the like, and (iii) enact an alteration to measurement step(s) and/or determination step(s) of an assay process in correlation with one or more variables associated with the liquid sample including, but not limited to, flow rate, temperature, and pressure to reduce a standard error of the assay.

Embodiments of the present invention can be implemented to (i) verify that a liquid within a turbidity measuring device during an assay process is of the same origin of that upon which the assay was performed, (ii) verify a flow through the turbidity measuring device including, but not limited to, a turbidimeter, a nephelometer, a fluorimeter, or the like, and (iii) enact an alteration to measurement step(s) and/or determination step(s) of an assay process in correlation with one or more variables associated with the liquid sample including, but not limited to, flow rate, temperature, and pressure to reduce a standard error of the assay.

The present invention relates to a device and a method for determining mixing ratios of flowing media, in particular for determining the mixing ratios of two gases by using two flow resistances with different characteristic curves, each flow resistance containing a differential pressure sensor and being connected in series, where one flow resistance is formed by a sintered metal filter and another flow resistance is formed by an orifice.

The present invention relates to a device and a method for determining mixing ratios of flowing media, in particular for determining the mixing ratios of two gases by using two flow resistances with different characteristic curves, each flow resistance containing a differential pressure sensor and being connected in series, where one flow resistance is formed by a sintered metal filter and another flow resistance is formed by an orifice.

Viscometers and Viscometry methods are disclosed. In one general aspect a capillary bridge viscometer comprises an input port an output port a first capillary tubing arm in a first hydraulic path between the input port and a first differential detection point, a second capillary tubing arm in a second hydraulic path between the first differential detection point and the output port, a third capillary tubing arm in a third hydraulic path between the input port and a second differential detection point, a fourth capillary tubing arm in a fourth hydraulic path between the second differential detection point and the output port, an adjustable mechanical flow restrictor in one of the first, second, third, and fourth hydraulic paths, wherein the adjustable mechanical flow restrictor is operative to mechanically adjust a resistance to flow of a fluid while the fluid flows through the adjustable mechanical flow restrictor.

Viscometers and Viscometry methods are disclosed. In one general aspect a capillary bridge viscometer comprises an input port an output port a first capillary tubing arm in a first hydraulic path between the input port and a first differential detection point, a second capillary tubing arm in a second hydraulic path between the first differential detection point and the output port, a third capillary tubing arm in a third hydraulic path between the input port and a second differential detection point, a fourth capillary tubing arm in a fourth hydraulic path between the second differential detection point and the output port, an adjustable mechanical flow restrictor in one of the first, second, third, and fourth hydraulic paths, wherein the adjustable mechanical flow restrictor is operative to mechanically adjust a resistance to flow of a fluid while the fluid flows through the adjustable mechanical flow restrictor.