Viscosimeter

Claim 2

A viscosimeter for testing liquids comprising: a flow system for liquid to be tested, having a capillary; zones for determining the pressure of the liquid to be tested located before and after the capillary, said zones for determining the pressure of the liquid to be tested being surrounded by tubes of a thin-walled material adapted to transfer the pressure of the liquid within the tubes to pressure transduction liquids outside each of the tubes; a pressure difference recording means having two chambers, each of said pressure transduction liquids being in contact with one of said two pressure chambers of said pressure difference recording means in such a manner that the pressure of the liquid to be tested at both sides of the capillary are transferred to said pressure chambers.

Claim 3

Viscosimeter according to claim 1, wherein the tubes of thin-walled material are flexible, thin-walled rubber tubes.

Claim 4

Viscosimeter according to claim 2, wherein the capillary is provided with a jacket through which a thermostatted liquid may be passed.

Claim 5

Viscosimeter according to claim 1, wherein the ends of the capillary are funnel-shaped and wherein the zones for determining the pressure of the liquid to be tested are located in line with the capillary.

Claim 6

Viscosimeter according to claim 1, wherein the tubes of thin-walled material are within chambers containing the pressure transduction liquid, said chambers being connected to connecting tubes, each of them leading to one of the two pressure chambers of the pressure difference recording means.

Claim 7

A viscosimeter comprising: a housing; a capillary tube positioned axially within said housing through which test fluid to be analyzed flows; means for measuring the pressure drop of said test fluid flowing through said capillary tube comprising first and second spaced apart pressure sensing zones positioned in said housing, one zone being attached to each end of said capillary tube, each pressure sensing zone having a container housing defining a chamber therein and a thin walled tube surrounding said pressure sensing zone so that test fluid flowing in said capillary tube flows through said pressure sensing zone and exerts pressure on said thin walled tube; means for sensing pressure in said pressure sensing zones comprising a differential pressure transducer; pressure transduction tubes connecting said differential pressure transducer to each of said pressure sensing zones and pressure transduction liquid which completely fills said transduction tubes and said pressure sensing zones and is separated from said test fluid flowing by said thin-walled tubes, said thin walled tubes transferring pressure from said pressure sensing zones to said differential pressure transducer via said pressure transduction liquid; and means for recording the differential pressure sensed by said differential pressure transducer.

Claim 8

A viscosimeter comprising: a housing; a capillary tube positioned axially within said housing through which test fluid to be analyzed flows; means for measuring the pressure drop of said test fluid flowing through said capillary tube comprising first and second spaced apart pressure sensing zones positioned in said housing, one zone being attached to each end of said capillary tube, each pressure sensing zone having a container housing defining a chamber therein and a thin walled tube surrounding said pressure sensing zone so that test fluid flowing in said capillary tube flows through said pressure sensing zone and exerts pressure on said thin walled tube; means for sensing pressure in said pressure sensing zones comprising a differential pressure transducer; pressure transduction tubes connecting said differential pressure transducer to each of said pressure sensing zones and pressure transduction liquid which completely fills said transduction tubes and said pressure sensing zones and is separated from said test fluid flowing by said thin-walled tubes, said thin walled tubes transferring pressure from said pressure sensing zones to said differential pressure transducer via said pressure transduction liquid; and means for recording the differential pressure sensed by said differential pressure transducer.

Claim 9

A measuring circuit for determining liquid pressure comprising: a viscosimeter comprising: a housing; a capillary tube positioned axially within said housing through which test fluid to be analyzed flows; means for measuring the pressure drop of said test fluid flowing through said capillary tube comprising first and second spaced apart pressure sensing zones positioned in said housing, one zone being attached to each end of said capillary tube, each pressure sensing zone having a container housing defining a chamber therein and a thin walled tube surrounding said pressure sensing zone so that test fluid flowing in said capillary tube flows through said pressure sensing zone and exerts pressure on said thin walled tube; means for sensing pressure in said pressure sensing zones comprising a differential pressure transducer, pressure transduction tubes connecting said differential pressure transducer to each of said pressure sensing zones, and pressure transduction liquid which completely fills said transduction tubes and said pressure sensing zones and is separated from said test fluid flowing by said thin walled tubes, said thin walled tubes transferring pressure from said pressure sensing zones to said differential pressure transducer via said pressure transduction liquid; means for recording the differential pressure sensed by said differential pressure transducer; and a supply of liquid to be tested.

Claim 10

A measuring circuit for determining liquid pressure comprising: a viscosimeter comprising: a housing; a capillary tube positioned axially within said housing through which test fluid to be analyzed flows; means for measuring the pressure drop of said test fluid flowing through said capillary tube comprising first and second spaced apart pressure sensing zones positioned in said housing, one zone being attached to each end of said capillary tube, each pressure sensing zone having a container housing defining a chamber therein and a thin walled tube surrounding said pressure sensing zone so that test fluid flowing in said capillary tube flows through said pressure sensing zone and exerts pressure on said thin walled tube; means for sensing pressure in said pressure sensing zones comprising a differential pressure transducer, pressure transduction tubes connecting said differential pressure transducer to each of said pressure sensing zones, and pressure transduction liquid which completely fills said transduction tubes and said pressure sensing zones and is separated from said test fluid flowing by said thin walled tubes, said thin walled tubes transferring pressure from said pressure sensing zones to said differential pressure transducer via said pressure transduction liquid; means for recording the differential pressure sensed by said differential pressure transducer; and a supply of liquid to be tested.

Claim 11

Measuring circuit according to claim 7, wherein the supply for the liquid to be tested consists of a zone in which the temperature of substrate may be brought to a desired level, a zone adapted to receive a reagent in a predetermined amount, and a zone in which the thus obtained liquid to be tested is supplied to the viscosimeter.

Claim 12

Viscosimeter comprising a flow system for the liquid to be tested, having a narrow zone, zones for determining the pressure of the liquid to be tested located before and after the said narrow zone, said zones for determining the pressure of the liquid to be tested being surrounded by tubes of a thinwalled material adapted to transfer the pressure of the liquid within the tubes to pressure transduction liquids outside each of the tubes, said tubes being within chambers containing the pressure transduction liquid, said chambers being connected to connecting tubes, a three way valve which may be brought in such a position that the connecting tubes are in mutual contact prior to filling the device with the pressure transduction liquid, said valve also allowing to form a connection with a supply vessel for the pressure transduction liquid, each of said pressure transduction liquids being in contact with one of two pressure chambers of a pressure difference recording means in such a manner that the pressures of the liquid to be tested at both sides of the narrow zone are transferred to said pressure chambers.

Claim 13

Viscosimeter comprising a flow system for the liquid to be tested, having a narrow zone, zones for determining the pressure of the liquid to be tested located before and after the said narrow zone, said zones for determining the pressure of the liquid to be tested being surrounded by tubes of a thinwalled material adapted to transfer the pressure of the liquid within the tubes to pressure transduction liquids outside each of the tubes, said tubes being within chambers containing the pressure transduction liquid, said chambers being connected to connecting tubes, a three way valve which may be brought in such a position that the connecting tubes are in mutual contact prior to filling the device with the pressure transduction liquid, said valve also allowing to form a connection with a supply vessel for the pressure transduction liquid, each of said pressure transduction liquids being in contact with one of two pressure chambers of a pressure difference recording means in such a manner that the pressures of the liquid to be tested at both sides of the narrow zone are transferred to said pressure chambers.