JPH1026582A - Capillary-type viscosimeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the capillary-type viscosimeter for two-point temperatures having the simple, compact configuration and the excellent thermal response. SOLUTION: The sample liquid at the approximately constant temperature is introduced into a container 1 at a small flow rate from a main flow path. In a first liquid-temperature viscosity measuring part 30, the sample liquid in the container 1 is made to flow into a flow path 2 with a quantitative pump 3 and guided to a first capillary 7. The differential pressure between both ends of the first capillary 7 is measured with a first differential pressure detector 8. The liquid temperature is measured with a first temperature measuring resistor 6. The absolute viscosity μ1 at the first liquid temperature is obtained with an operating BOX 17. The flow path 2 connected to the first capillary 7 is guided out to the outside of the container 1 and guided to a heat exchanger 14 in a second liquid-temperature viscosity measuring part 31. The sample liquid at the first liquid temperature undergoes heat exchange into the second liquid temperature. The sample liquid heat-exchanged to the second liquid temperature flows into a second capillary 9 contained in a heat insulating BOX 13. The differential pressure between both ends of the second capillary 9 is measured with a second differential pressure detector 10. The second liquid temperature is measured with a second temperature measuring resistor 11. The absolute viscosity μ2 at the second liquid temperature is obtained with the operating BOX 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capillary viscometer and, more particularly, to a capillary viscometer, in which a sample liquid of a viscosity measuring liquid is introduced and discharged from a liquid main flow path. The present invention relates to a capillary viscometer having a plurality of capillary viscosity measuring means for measuring viscosity at two different temperatures.

[0002]

2. Description of the Related Art In a capillary viscometer, when a liquid to be measured having a constant temperature and a constant flow rate is flowed in a laminar flow through a capillary having a constant cross section and a predetermined length, the differential pressure between both ends of the capillary is proportional to the absolute viscosity. It is a high-precision viscometer utilizing this fact, and is used, for example, as a quality control measuring device for controlling the quality of liquid in a product line such as a petroleum product or a synthetic resin by viscosity. When mixing oils of different components, the absolute viscosity of the mixed oil at two different temperatures is measured, and the density at the temperature is determined by density measuring means, and the absolute viscosity at each temperature is calculated as the density. To calculate the kinematic viscosity at a reference temperature based on a predetermined temperature-kinematic viscosity diagram, or compare a mixed oil having a predetermined mixing ratio with the diagram. It is used to check the mixing ratio.

[0003] By the way, a conventional capillary viscometer for controlling the sample liquid to different first liquid temperature and second liquid temperature and measuring the absolute viscosity at different liquid temperatures is a constant temperature upstream of two constant temperature baths. A first temperature control means for immersing a single sample liquid flow path in which a fixed flow rate of the sample liquid flows in the heat medium of the tank, and heating the heat medium in an upstream constant temperature bath; The viscosity at the first liquid temperature is measured in proportion to the pressure difference between both ends of the first thin tube interposed in the sample, and the heating medium is heated to the second liquid temperature by the heating means even in the downstream constant temperature bath, thereby obtaining the sample. The viscosity at the second liquid temperature, which is proportional to the pressure difference between both ends of the second thin tube connected to the liquid flow path, is measured.

[0004] In the downstream thermostat, there is a heat transfer tube in which the sample liquid flow path is wound in a coil shape, and it is attempted to exchange heat of the sample liquid of the first liquid temperature with the second liquid temperature. ing. As described above, the conventional two-point temperature capillary viscometer has a constant temperature bath and uses a heat transfer tube as heat exchange means.

[0005]

The conventional capillary viscometer for measuring the absolute viscosity of a sample liquid at two different temperatures is composed of two low-temperature and high-temperature thermostats and two thermostats in each thermostat. Since it has a capillary viscosity measuring means, the whole becomes large and requires a large installation area. Furthermore, since the sample liquid flow paths are each heated via the heat medium in the thermostat,
Since the heat conversion efficiency is poor and the heat response time is long, the measurement time of the absolute viscosity at the two-point temperature is long, and there is a problem that the efficiency is inefficient. Furthermore, in order to measure the absolute viscosity with high accuracy, it is necessary to precisely control the temperature of the liquid flowing at a constant flow rate in the constant temperature bath, which makes the control device complicated and expensive. There was a problem.

According to the present invention, a first liquid temperature viscosity measuring means for measuring absolute viscosities at two different temperatures and a second liquid temperature viscosity measuring means are provided separately, and the first liquid temperature measuring means is provided separately. A heat exchanger is provided between the liquid temperature viscosity measuring means and the second liquid temperature viscosity measuring means for converting the temperature of the sample liquid at the first liquid temperature into the liquid sample at the second liquid temperature. An object of the present invention is to provide a small-sized and inexpensive capillary viscometer by cooling to enhance work efficiency.

[0007]

According to a first aspect of the present invention, there is provided a container in which a liquid having a substantially constant first liquid temperature flows, a flow tube having one end opened in the container, and the liquid being supplied to the flow tube. A pump for pumping at a constant flow rate and a first thin tube, a first liquid temperature viscosity measuring unit for measuring an absolute viscosity of the liquid at a first liquid temperature from a pressure difference between both ends of the first thin tube; From the downstream side of the first liquid temperature viscosity measurement unit to the outside of the vessel, and convert the liquid of the first liquid temperature flowing through the flow tube into a second liquid temperature different from the first liquid temperature. A chamber for measuring the second liquid temperature, a second capillary connected in close proximity to the chamber, a second liquid temperature in the chamber and a liquid temperature in the second capillary. And a warmer for preventing the temperature difference from occurring, and measuring the absolute viscosity of the liquid at the second liquid temperature from the differential pressure across the second thin tube. Consists of a second liquid temperature for the viscosity measurement unit,
The flow tube connected to the downstream side of the second liquid temperature viscosity measurement unit is opened in the container, and the liquid is returned into the container.

According to a second aspect of the present invention, there is provided a pump, which is connected to a flow pipe through which a temperature-unstable liquid branched from the main flow path flows, for pumping the liquid at a constant flow rate, a heat transfer pipe for promoting heat exchange, and a first heat transfer pipe. A first chamber and a first chamber for measuring a liquid temperature;
Is provided in a constant temperature bath controlled at a constant first liquid temperature, and the liquid temperature of the liquid in the flow tube is converted to the first liquid temperature,
A first liquid temperature viscosity measuring unit for measuring the absolute viscosity of the liquid at the first liquid temperature from a pressure difference between both ends of the first thin tube, and a flow tube from a downstream side of the first liquid temperature viscosity measuring unit. A heat exchanger which is led out of the constant temperature bath and converts the liquid having the first liquid temperature flowing through the flow tube into a second liquid temperature different from the first liquid temperature;
A second chamber for measuring the liquid temperature, a second capillary connected in close proximity to the second chamber, a second liquid temperature in the second chamber, and a liquid temperature in the second capillary. And a second liquid temperature viscosity measuring unit for measuring the absolute viscosity of the liquid at the second liquid temperature from the differential pressure across the second thin tube, The flow tube connected to the downstream side of the second liquid temperature viscosity measurement unit is opened in the main flow path, and the liquid is returned to the main flow path.

According to a third aspect of the present invention, in the capillary viscometer of the first or second aspect, the second liquid temperature viscosity measuring section can be detachably connected to the first liquid temperature viscosity measuring section. It is like that.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Invention of Claim 1) FIG. 1 is a configuration diagram for explaining an embodiment of a capillary viscometer according to the invention of Claim 1.
In the figure, 1 is a sample liquid container, 2 is a sample liquid flow path, 2a
2c is a valve, 3 is a metering pump, 4 is a synchronous motor, 5 is a starter BOX, 6 is a first resistance temperature detector, 7 is a first thin tube, 8 is a first differential pressure detector, and 9 is a 2, a thin tube, 10 a second differential pressure detector, 11 a second resistance temperature detector, 12 a chamber, 13 a warm box, 14 a heat exchanger, 15a, 1
5b is a heat exchange liquid flow path, 16 is a regulating valve, 17 is a calculation BO
X, 18 are the first liquid temperature signal, 19 is the first differential pressure signal, 2
0 is the second liquid temperature signal, 21 is the second differential pressure signal, 22 is the temperature signal at the time of density measurement, 23 is the density signal, 30 is the first liquid temperature viscosity measurement unit, and 31 is the second liquid temperature. It is a viscosity measuring unit.

The capillary viscometer shown in FIG. 1 has a liquid inlet 1a and an outlet 1b into which a sample liquid having a substantially constant first liquid temperature flows at a constant flow rate, and a first viscometer for measuring the absolute viscosity of the sample liquid. The sample liquid measured by the first liquid temperature viscosity measurement unit 30 is led out of the sample liquid container 1 (hereinafter, referred to as container 1) provided with the liquid temperature viscosity measurement unit 30, and a predetermined constant A heat exchanger 14 for heating or cooling to a second liquid temperature is provided, and further, the absolute viscosity of the sample liquid that has reached the second liquid temperature and stored in the heat-retaining BOX 13 is measured in the outflow measurement of the heat exchanger 14. The second liquid temperature viscosity measuring unit 31 is installed, and after measuring the absolute viscosity at two different temperatures, the sample liquid is returned into the container 1 again.

As described above, the sample liquid flows from the main flow path to the first
The liquid flows into the container 1 via the inlet 1a of the liquid temperature viscosity measuring unit 30, flows through the sample liquid flow path 2 to the outside of the container 1, is returned to the container 1 again, and flows out of the outlet 1b into the main flow path. Is done. First, a fixed amount of the sample liquid is pumped into the sample liquid flow path 2 by the metering pump 3 provided near the inflow port 2-1 in the container 1 and is led out of the container 1 through the first thin tube 7. You. The differential pressure ΔP _{1 at} both ends of the first thin tube 7 is led to the outside of the container by conduits 2-2 and 2-3 and connected to the first differential pressure detector 8. The metering pump 3 is a synchronous motor 4
, And the synchronous motor 4 is driven by a starter box.
5 is driven and controlled. Further, the first liquid temperature in the container 1 is detected by the first temperature measuring resistor 6.

Next, the sample liquid flow path 2 is introduced into the second liquid temperature viscosity measuring section 31 via the valve 2a, passes through the heat exchanger 14, and reaches the heat retaining BOX 13. The heat exchanger 14 has the sample liquid flow path 2 inserted therein, and the heat exchange liquid flow paths 15a, 1 into and out of which a heat medium having a constant temperature flows in and out of the control valve 16 through an adjustment valve 16.
5b is provided, and the sample liquid is heated or cooled to a temperature according to the purpose. The flow rate of the sample liquid at this time is, for example, a very small flow of about several (liter / hour), so that the sample liquid is heated or cooled in a responsive manner.

Next, the sample liquid flow path 2 is provided with a heat insulating BOX.
After the temperature of the sample solution is detected by the second resistance temperature detector 11 in the chamber 12 after the
Through the thin tube 9 of the valve, and is led out of the heat-retaining BOX 13 and the valve 2b
, And is discharged to the main flow path from the discharge port 1b in the container 1. The differential pressure ΔP _{2 at} both ends of the _second thin tube 9 is led out of the heat-retaining BOX 13 via the conduits 2-4 and 2-5 and is measured by the second differential pressure detector 10.

The absolute viscosity μ _{1 obtained} by the first liquid temperature viscosity measuring section 30 is obtained by introducing the differential pressure signal 19 from the first differential pressure detector 8 into the arithmetic BOX 17 and calculating the difference from the Hagen Poiseuille.
By using Poeseuille's law, the viscosity at the first liquid temperature can be determined. Similarly, the absolute viscosity μ ₂ by the second liquid temperature viscosity measurement unit 31 is obtained by introducing the differential pressure signal 21 from the second differential pressure detector 10 to the calculation box 17,
The viscosity at the time of the second liquid temperature can be obtained by utilizing the above-mentioned Hagen Poeseuille's law.

The density signal 23 is generated by, for example, vibrating a thin-walled cylinder through which a sample liquid flows at a natural frequency in a radial direction, or by supporting a measuring tube of a Coriolis flowmeter (not shown) through which a liquid flows through a supporting shaft. Is calculated as an inverse function of a natural frequency when a natural vibration is applied around the fulcrum with the fulcrum as a fulcrum, and a density value ρ ₁₅ at a reference temperature, for example, 15 ° C., is calculated in an operation box 17 according to the temperature signal 22 at that time. From this value, the density ρ ₁ at the liquid temperature t ₁ in the _first liquid temperature viscosity measuring means is calculated, and similarly, the density ρ ₁ at the liquid temperature t ₂ in the _second liquid temperature viscosity measuring means is calculated. ρ ₂
Is calculated, and the first kinematic viscosity ν ₁ and the second kinematic viscosity ν ₂ are obtained from the relationship among the absolute viscosity, the kinematic viscosity and the density.

JIS based on the first kinematic viscosity ν ₁ and the second kinematic viscosity ν ₂
By using the equation defined in K2283,
The kinematic viscosity ν ₅₀ at a predetermined temperature, for example, 50 ° C. can be determined.

According to the first aspect of the present invention, as shown in FIG. 1, a container 1 into which a sample liquid at a substantially constant temperature flows in and out.
The first viscosity μ ₁ at the first liquid temperature is calculated from the differential pressure ΔP ₁ obtained by pumping the sample liquid in the container 1 by the metering pump 3 and introducing the sample liquid into the first thin tube 7. The sample liquid with a small flow rate derived from the one-liquid temperature viscosity measurement unit 30 is heated or cooled by the heat exchanger 14 to a temperature according to the purpose, and the heat retention B
Since the sample liquid was introduced into the thin tube 9 housed in the OX 13 and flowed to the second liquid temperature viscosity measurement unit 31 for calculating the second viscosity μ ₂ , the first liquid temperature viscosity measurement unit 30 and the second liquid temperature viscosity measurement unit 30 2
By appropriately combining the liquid temperature viscosity measurement unit 31,
A large thermostat is not required, and a small capillary viscometer can be constructed. Moreover, the sample liquid can be excessively converted from the first liquid temperature to the second liquid temperature with good response by the heat exchanger 14, and the absolute viscosity is measured with high accuracy while the second liquid temperature is maintained by the heat retention box 13. can do.

(Invention of Claim 2) FIG. 2 is a view for explaining another embodiment of the capillary viscometer according to the invention of claim 2, in which 32 is a thermostat, and 33 is a thermostat. Stirrer,
34 is a heater, 35 is a temperature measuring resistor for controlling the temperature of the thermostat 32, 36 is a heat transfer tube, 40 is a sample liquid inlet,
Reference numeral 41 denotes a sample liquid outlet, 42 denotes an inlet valve, 43 denotes an outlet valve, and 50 denotes a control box. The same reference numerals as in FIG.

The capillary viscometer shown in FIG. 2 is used when the temperature of the sample liquid is unstable. Thermostat 32 for controlling the temperature of the container to a stable first temperature;
A control box 50 for keeping the inside temperature constant is provided.

A fixed amount of heat medium 32a is
And a sample liquid flow path 2 through which a temperature-unstable sample liquid flows in the thermostatic bath 32. The heat medium 32
has a control box 50 for controlling a to a constant first temperature. The control box 50 is connected to a temperature control resistor 35 for temperature control, a heater 34, and a stirring device 33, and a fixed amount of heat medium. 32a is maintained at a uniform and constant first temperature.

The thermostat 32 has a sample liquid inlet 40 and an inlet valve 42 for introducing a sample liquid from outside the thermostat 32.
Is connected, a constant flow rate of the sample liquid is pumped into the sample liquid flow path 2 by the metering pump 3, and heat exchange is promoted by the heat transfer tube 36 wound in a coil shape. Heated and maintained at the first liquid temperature. A first temperature measuring resistor 6 and a first thin tube 7 are connected to the downstream side of the heat transfer tube 36 via the sample liquid flow path 2. A first liquid temperature in the flow path 2 is detected, and a differential pressure between both ends of the first thin tube 7 is measured by a first differential pressure detector 8,
It can be the absolute viscosity mu ₁ of the first liquid temperature.

The sample liquid flow path 2 connected to the first thin tube 7 is led out of the first liquid temperature viscosity measurement unit 30 and is subjected to the second liquid temperature viscosity measurement, as in the case of FIG. The heat is introduced into the section 31 via the valve 2a, passes through the heat exchanger 14, and is stored in the heat-retaining BOX.
13 and the second capillary 9. Therefore,
The heat is converted to the second liquid temperature by the heat exchanger 14,
2, the second temperature sensor 11 detects the second liquid temperature,
The differential pressure at both ends of the second thin tube 9 is measured by the second differential pressure detector 10, and the absolute viscosity μ ₂ at the second liquid temperature can be obtained.

According to the capillary viscometer according to the second aspect of the present invention, when the temperature of the sample liquid is unstable, the sample liquid is controlled to the first liquid temperature in the thermostatic chamber 32 to reduce the absolute viscosity μ ₁ . Since the viscosity measuring unit 30 for the first liquid temperature that is obtained is installed, the first liquid temperature can be controlled with good response by the heat medium 32a having excellent heat conductivity and a large heat capacity.

(Invention of claim 3) In the invention of claim 3, the first liquid temperature viscosity measuring section 30 and the second liquid temperature viscosity measuring section 31 are made detachable. 2, the first liquid temperature viscosity measuring section 30 and the second liquid temperature viscosity measuring section 31 are connected to the valve 2 of the sample liquid flow path 2.
By closing the valve a and the valve 2b, it becomes detachable, and by opening the valve 2c, the viscosity measurement at the first liquid temperature can be performed by the first liquid temperature viscosity measuring unit 30 alone. Further, by partially improving the flow path of the existing one-point temperature capillary viscometer and connecting the second liquid temperature viscosity measurement unit 31, it is easy to change the one-point temperature capillary viscometer from the one-point temperature capillary viscometer. It can be a capillary viscometer with a point temperature.

[0026]

According to the first aspect of the present invention, the first constant is substantially constant.
In a container through which a liquid having a liquid temperature flows, a flow tube having one end open in the container, a pump for pumping the liquid at a constant flow rate into the flow tube, and a first thin tube are provided, and both ends of the first thin tube are provided. A first method for measuring the absolute viscosity of the liquid at a first liquid temperature from the differential pressure;
A liquid temperature viscosity measuring unit and the flow tube are led out of the vessel from a downstream side of the first liquid temperature viscosity measuring unit, and the liquid having the first liquid temperature flowing through the flow tube is subjected to the first liquid temperature. A heat exchanger for converting to a second liquid temperature different from the above, a chamber for measuring the second liquid temperature, a second thin tube connected in close proximity to the chamber, and a second liquid temperature in the chamber And a warmer for preventing a temperature difference between the liquid temperature in the second thin tube and the liquid temperature in the second thin tube, and measuring the absolute viscosity of the liquid at the second liquid temperature from the pressure difference between both ends of the second thin tube. A liquid temperature viscosity measurement unit, the flow tube connected to the downstream side of the second liquid temperature viscosity measurement unit was opened in the container, and the liquid was returned into the container. By appropriately combining the viscosity measuring unit for the first liquid temperature and the viscosity measuring unit for the second liquid temperature, a large-sized constant temperature bath is not required and a small capillary tube It can be configured degree meter. Further, the temperature of the sample solution can be converted from the first solution temperature to the second solution temperature with good response by the heat exchanger, and the absolute viscosity can be measured with high accuracy while maintaining the second solution temperature by the warmer. be able to.

According to a second aspect of the present invention, there is provided a pump connected to a flow pipe through which a temperature-unstable liquid branched from the main flow path flows to pump the liquid at a constant flow rate, a heat transfer pipe for promoting heat exchange, A first chamber and a first thin tube for measuring one liquid temperature are provided in a constant temperature chamber controlled at a constant first liquid temperature, and the liquid temperature of the liquid in the flow tube is converted into the first liquid temperature. A first liquid temperature viscosity measuring unit for measuring an absolute viscosity of the liquid at the first liquid temperature from a differential pressure between both ends of the first thin tube;
The flow pipe is led out of the constant temperature bath from the downstream side of the first liquid temperature viscosity measurement unit, and the liquid of the first liquid temperature flowing through the flow pipe is set to a second liquid temperature different from the first liquid temperature. A heat exchanger to be converted, a second chamber for measuring the second liquid temperature, a second thin tube connected in close proximity to the second chamber, and a second liquid temperature in the second chamber. A second liquid for measuring an absolute viscosity of the liquid at the second liquid temperature from a pressure difference between both ends of the second thin tube, provided with a warmer for preventing a temperature difference from a liquid temperature in the second thin tube; A liquid viscosity measuring section, and the flow tube connected to the downstream side of the second liquid temperature viscosity measuring section was opened in the main flow path, and the liquid was returned to the main flow path.
In addition to the effect of the first aspect, even in the case of a sample liquid whose temperature is unstable, it is possible to control the first liquid temperature with good responsiveness in a thermostatic chamber having excellent heat conductivity and a large heat capacity.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the second liquid temperature viscosity measuring section can be detachably connected to the first liquid temperature viscosity measuring section. Accordingly, the viscosity measurement at the first liquid temperature can be performed by the first liquid temperature viscosity measurement unit alone by operating the valve. Also,
By partially improving the flow path of the existing one-point temperature capillary viscometer and connecting the second liquid temperature viscosity measurement unit,
A one-point temperature capillary viscometer can easily be changed to a two-point temperature capillary viscometer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for describing an embodiment of a capillary viscometer according to the invention of claim 1;

FIG. 2 is a view for explaining an embodiment of a capillary viscometer according to the invention of claim 2;

[Explanation of symbols]

1: Sample liquid container, 2: Sample liquid flow path, 2a to 2c
... Valve, 3 ... Meter pump, 4 ... Synchronous motor, 5 ... Starter BOX, 6 ... First resistance temperature detector, 7 ... First thin tube, 8 ...
1st differential pressure detector, 9 ... second capillary, 10 ... second differential pressure detector, 11 ... second resistance temperature detector, 12 ... chamber, 1
3 ... Heat-retaining BOX, 14 ... Heat exchanger, 15a, 15b ... Heat exchange liquid flow path, 16 ... Adjustment valve, 17 ... Calculation BOX, 18
... first liquid temperature signal, 19 ... first differential pressure signal, 20 ... second
Liquid temperature signal, 21 ... second differential pressure signal, 22 ... temperature signal at the time of density measurement, 23 ... density signal, 30 ... first liquid temperature viscosity measurement unit, 31 ... second liquid temperature viscosity measurement unit, 32 ... constant temperature bath, 3
DESCRIPTION OF SYMBOLS 3 ... Stirrer, 34 ... Heater, 35 ... Temperature measuring resistor for temperature control of thermostat 32, 36 ... Heat transfer tube, 40 ... Sample liquid inlet, 41 ... Sample liquid outlet, 42 ... Inlet valve, 43 ... Exit Valve, 50 ... control box.

Claims (3)

[Claims] 1. A flow tube having one end opened in a container through which a liquid having a substantially constant first liquid temperature flows, a pump for pumping the liquid to the flow tube at a constant flow rate, and a first thin tube. A first liquid temperature viscosity measurement unit that measures the absolute viscosity of the liquid at a first liquid temperature from a pressure difference between both ends of the first thin tube; and a flow tube that is connected to the first liquid temperature viscosity measurement unit. A heat exchanger that is led out of the vessel from a downstream side and converts the liquid at the first liquid temperature flowing through the flow tube into a second liquid temperature different from the first liquid temperature;
A chamber for measuring the liquid temperature, a second capillary connected in close proximity to the chamber, and no temperature difference between the second liquid temperature in the chamber and the liquid temperature in the second capillary. And a second liquid temperature viscosity measuring unit for measuring the absolute viscosity of the liquid at the second liquid temperature from the pressure difference between both ends of the second thin tube, and the second liquid temperature viscosity A capillary viscometer, wherein the flow tube connected to a downstream side of a measuring unit is opened in the container, and the liquid is returned into the container. 2. A pump connected to a flow pipe through which a temperature-unstable liquid branched from the main flow path flows for pumping the liquid at a constant flow rate, a heat transfer pipe for promoting heat exchange, and measuring a first liquid temperature. A first chamber and a first thin tube are provided in a constant temperature bath controlled at a constant first liquid temperature, and the liquid temperature of the liquid in the flow tube is converted to a first liquid temperature, and A first liquid temperature viscosity measurement unit for measuring the absolute viscosity of the liquid at the first liquid temperature from the pressure difference between both ends of the thin tube, and the flow tube is connected to the outside of the constant temperature bath from a downstream side of the first liquid temperature viscosity measurement unit. And the liquid having the first liquid temperature flowing through the flow tube is changed to a second liquid having a different liquid temperature from the first liquid temperature.
A heat exchanger for converting to a liquid temperature, a second chamber for measuring the second liquid temperature, a second thin tube connected in close proximity to the second chamber, and a second capillary in the second chamber. Liquid temperature and the second
A second liquid temperature viscosity for measuring an absolute viscosity of the liquid at the second liquid temperature from a pressure difference between both ends of the second thin tube by providing a warmer for preventing a temperature difference from a liquid temperature in the thin tube. A capillary tube comprising a measuring unit, wherein the flow tube connected to the downstream side of the second liquid temperature viscosity measuring unit is opened in the main flow path, and the liquid is returned into the main flow path. Total. 3. The first liquid temperature viscosity measuring section according to claim 1, wherein
3. The capillary viscometer according to claim 1, wherein the capillary viscometer can be detachably connected to a liquid temperature viscosity measuring unit.