JP2006214842A - Liquid physical property value measuring instrument and liquid physical property value measuring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure the concentration and density of a liquid specimen in addition to its viscosity. <P>SOLUTION: This liquid physical property value measuring instrument 10 for measuring the physical property values of the liquid specimen which is a measuring object, includes a viscometer body 12 of a tuning fork vibration type; an arithmetic processing part 46 for calculating the viscosity of the specimen based on a numerical value obtained from the viscometer body 12; and a memory 48 stored with the viscosity calculated by the processing part 46. The viscometer main body 12 includes a specimen temperature sensor 26 for detecting the temperature of the specimen. The memory 48 is stored with a relational expression between "the concentration, the viscosity, and the specimen temperature" of the specimen. The processing part 46 converts the calculated viscosity into concentration and/or density based on the specimen temperature detected by the temperature sensor 26 and on the relational expression. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a liquid property value measuring device and a liquid property value measuring method, and more particularly to a liquid property value measuring device and a liquid property value measuring method for measuring concentration and / or density in addition to the viscosity of a sample.

  Conventionally, when a plurality of types of physical property values such as viscosity and density of a liquid sample are to be measured simultaneously with one measuring device, an apparatus and a method as described in Patent Document 1, Patent Document 2 or Patent Document 3 are used. It was used.

  In the liquid property value measuring apparatus and method disclosed in Patent Document 1, the density ρ of the liquid to be measured is detected from the resonance frequency of the vibration voltage applied to the vibrator, and the density ρ and the viscosity of the liquid to be measured are detected from the electrical output of the vibration sensor. The product ξ of η was detected, and the viscosity η was obtained from the product ξ and the density ρ.

  In addition, in the liquid property value measuring apparatus and method disclosed in Patent Document 2, calculation is performed using the torque T of the stirrer, the rotation speed n, and the power characteristics of the stirrer, and the viscosity η and density of the contents in the can ρ was measured.

  Further, in the liquid property value measuring apparatus and method disclosed in Patent Document 3, the tuning fork type vibrating piece 22 is immersed in the liquid to be measured, and the vibrating piece 22 is vibrated at a high resonance frequency f of several kHz to 20 kHz. From the characteristics of f, resonance sharpness Q, and input / output phase difference P, the viscosity η and density ρ of the liquid to be measured were obtained.

  However, these liquid property value measuring devices and methods have technical problems described below.

JP-A-11-183353 JP-A-9-222387 Japanese Patent Laid-Open No. 11-173968

  In the liquid property value measuring apparatus and method disclosed in Patent Document 1 and Patent Document 2, the temperature of the sample is not considered at all in obtaining a plurality of types of property values, but the viscosity is highly temperature-dependent and general. In such a liquid, 5 to 10% changes with a temperature change of 1 ° C.

  Therefore, when using the apparatus or method described in Patent Document 1 or Patent Document 2 to precisely control or evaluate the physical property value of the sample, the temperature of the sample is made constant, for example, using a thermostatic bath facility. It was necessary to adjust to this, which was a factor of cost increase. In addition, the more precise measurement is performed, the longer it takes to adjust the temperature of the sample, and thus there is a problem that the work is greatly delayed or the physical properties of the sample are changed over time.

  Further, in the rotational torque detection method described in Patent Document 2 and the resonance frequency detection method described in Patent Document 1 and Patent Document 3, the measurement accuracy of viscosity, concentration, density, etc. in a low viscosity region such as water is particularly poor. There are problems such as poor reproducibility of measurement in the viscosity region, narrow detection range of the physical quantity to be detected, and inability to detect in a wide range with one measuring device (sensor).

  This is due to the technical problem that the detection sensitivity of each physical quantity detected by the above method is low. For example, in the rotational torque detection method, since the torque range detected by one torque sensor is narrow, many rotors are prepared and the range is subdivided. The essential problem of this technique is that it is detected as a displacement amount of a spring using a spring material for torque detection. This rotational torque detection method corresponds to a “spring only” in a mass meter and is the method with the lowest measurement accuracy.

  Also, in the resonant frequency method, high frequency vibration of several kHz or more is applied to the vibrator as a small displacement of about several tens of microns. Therefore, heat generated by slip, friction, friction at the interface between the liquid to be measured and the vibrator, or mechanical stress. There was a problem that the physical properties of the sample changed and the detection accuracy was not improved.

The present invention has been made in view of such conventional problems, and the object of the present invention is to measure the viscosity and the sample temperature without having to adjust the sample temperature to a predetermined value. An object of the present invention is to provide a liquid property value measuring apparatus and a liquid property value measuring method capable of obtaining a density and a concentration quickly and with high accuracy.

  In order to achieve the above object, a liquid property value measuring apparatus according to the present invention is a liquid property value measuring apparatus for measuring a property value of a liquid sample which is a measurement object, and is a magnetic circuit composed of a magnet and a yoke. A tuning fork vibration viscometer body that drives two or more pairs of vibrators by electromagnetic force generated by a combination of the electromagnetic coil and a displacement sensor to measure and detect the fluctuation amount of the driven vibrators, An arithmetic processing unit that calculates the viscosity of the sample based on a numerical value obtained from the viscometer main body, and a memory that stores the viscosity calculated by the arithmetic processing unit, the viscometer main body includes the sample The memory includes a sample temperature sensor for detecting the temperature of the sample, and the memory stores in advance a relative relationship between the “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature” of the sample, Above Calculation processing unit, the viscosity calculated for the sample, and the sample temperature detected by the sample temperature sensor, on the basis of the relative relationship, and so converted into concentration and / or density.

  Further, the liquid property value measuring method according to the present invention is a liquid property value measuring method for measuring a physical property value of a liquid sample which is a measurement object, wherein the “concentration, viscosity and sample temperature” and / or “ The relative relationship of “density, viscosity, and sample temperature” is paired by the first process of storing in the memory in advance and the electromagnetic force generated by the combination of the magnetic circuit composed of the magnet and the yoke and the electromagnetic coil. The above-mentioned viscosity of the sample calculated by a tuning-fork vibration viscometer of a type that drives the vibrator and measures and detects the fluctuation amount of the driven vibrator by a displacement sensor is the sample temperature detected by the sample temperature sensor. And a second step of converting to a concentration and / or density based on the relative relationship.

  According to the liquid property value measuring apparatus and method configured in this way, based on the relative relationship of “concentration, viscosity, and sample temperature” and / or the relative relationship of “density, viscosity, and sample temperature” stored in advance in memory. Since the concentration and / or density is converted from the viscosity calculated for the measurement object and the detected sample temperature, only one viscosity can be obtained by a tuning fork vibration type liquid physical property measuring apparatus using electromagnetic force. In addition, a plurality of physical property values such as density and density can be obtained with high accuracy and a wide dynamic range.

  Furthermore, in addition to the relative relationship between “concentration and viscosity” or “density and viscosity”, the sample temperature is added as a variable, so in particular for samples with high temperature dependence, the sample temperature is kept constant using a thermostatic chamber or the like. Therefore, it is possible to measure a plurality of physical property values at an arbitrary sample temperature, which contributes to rapid measurement.

  In addition, improvements in measurement accuracy, measurement time, and management evaluation time for various physical quantities required for machine oils and greases, liquid crystal resists, printing inks, and other industrial liquids are now increasing productivity in the factory line. Directly connected and at the same time leads to improvement of product quality, which is an important issue for each company, and the present invention makes it possible to propose an improvement in the level of liquid sample management and evaluation to the industrial liquid market.

  In addition, when the relative relationship is unknown, the arithmetic processing unit calculates the viscosity by changing the sample temperature for the plurality of samples having different concentrations and / or densities, and uses the sample temperature as a parameter. An approximate expression may be calculated from the relative relationship between viscosity and / or density and viscosity and stored in the memory.

  Further, when the relative relationship is unknown, in the first process, for a plurality of the samples having different concentrations and / or densities, the viscosity is calculated by changing the sample temperature, and the concentration using the sample temperature as a parameter is calculated. The approximate expression may be calculated from the relative relationship between the viscosity and / or the viscosity and / or the density and the viscosity, and stored in the memory.

  According to this configuration, even with a sample whose relative relationship between “concentration, viscosity, and sample temperature” or “density, viscosity, and sample temperature” is unknown, the viscosity is measured by changing the sample temperature with a sample having a different concentration. Thus, these relational expressions can be obtained, and the concentration and density can be obtained.

  Further, the arithmetic processing unit converts the calculated viscosity and the converted concentration and / or density into a value at a predetermined temperature based on a relative relationship stored in the memory. May be.

  The liquid property value measuring method includes a third step of converting the calculated viscosity and the converted concentration and / or density into a value at a predetermined temperature based on the relative relationship. It may be a thing.

  According to this configuration, for example, when performing sample management and sample evaluation, facilities and labor for managing the sample temperature at a constant level are not required, so that capital investment can be reduced and management and evaluation can be facilitated.

  In addition, the relative relationship is stored in the memory for each sample having a different constituent material, and the arithmetic processing unit determines the relative relationship corresponding to the measurement object according to the selection input of the sample type from the input unit. It may be called from memory.

  The relative relationship is stored in the memory for each sample having a different constituent material. In the second process, the relative relationship corresponding to the measurement object is determined according to the selection input of the sample type. It may be called from the memory.

According to this configuration, the arithmetic processing unit can always call the relational expression corresponding to the measurement object from the memory to obtain the viscosity and concentration of an arbitrary sample, which contributes to speeding up the measurement.

  According to the liquid property value measuring apparatus and the liquid property value measuring method according to the present invention, the relative relationship between the “concentration, the viscosity, and the sample temperature” and / or the “density, the viscosity, and the sample temperature” stored in the memory in advance. Based on the above, the concentration and / or density is converted from the viscosity calculated for the measurement object and the detected sample temperature. Therefore, not only the viscosity but also a plurality of concentrations and densities can be obtained by one apparatus. The physical property value can be obtained.

Furthermore, in addition to the relative relationship between “concentration and viscosity” or “density and viscosity”, the sample temperature is added as a variable, so in particular for samples with high temperature dependence, the sample temperature is kept constant using a thermostatic chamber or the like. Therefore, it is possible to measure a plurality of physical property values at an arbitrary sample temperature, which contributes to rapid measurement.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. The liquid property value measuring apparatus 10 of the present embodiment is a tuning fork vibration type viscometer that measures the viscosity of a liquid sample X that is an object to be measured, and FIG. 1 is used to detect a numerical value necessary for calculating the viscosity. FIG. 3 is a structural diagram of a drive mechanism portion of the viscometer body 12 of FIG.

  As will be described in detail below, the viscometer body 12 drives two or more vibrators that are paired by an electromagnetic force generated by a combination of a magnetic circuit composed of a magnet and a yoke and an electromagnetic coil. A method of measuring and detecting the fluctuation amount of the vibrator by a displacement sensor is adopted.

  The drive mechanism portion of the viscometer body 12 has a frame 14 whose cross section is roughly inverted. Plate springs 16 having the same shape are respectively fixed to the upper side surface of the frame 14.

  On the lower end side of each leaf spring 16, a pair of tuning fork vibrators 18 having the same shape and immersed in the sample X are fixed. Each vibrator 18 is formed of a thin flat plate material such as a ceramic member or a metal member, and has a circular enlarged portion at the tip. The pair of vibrators 18 has a center axis in the thickness direction in the sample X. It arrange | positions so that it may be located on the same plane. It should be noted that two or more vibrators 18 may be paired. Further, the vibrator 18 preferably has a shape and material having a small heat capacity in order to minimize the temperature change of the sample X during measurement.

  A magnet 20 (a magnetic circuit composed of a magnet and a yoke) protruding to the frame 14 side is fixed to the upper end side of each vibrator 18. One end of the magnet 20 is inserted inside the electromagnetic coil 22 supported on the side surface of the frame 14, and an electromagnetic force is generated by the combination of the magnet 20 and the electromagnetic coil 22 to cause the vibrator 18 to electromagnetically vibrate. The electromagnetic drive part 23 is comprised. The pair of vibrators 18 are supplied with electromagnetic vibrations having opposite phases from each other by the electromagnetic driving units 23.

  The frame 14 is provided with a displacement sensor 24 on the upper side of one electromagnetic coil 22. The displacement sensor 24 is disposed near the leaf spring 16, and the amplitude value of the leaf spring 16 due to electromagnetic vibration, that is, The fluctuation amount of the vibrator 18 is detected.

  In addition, a sample temperature sensor 26 is provided at the center of the frame 14 so as to be immersed in the sample X and detect its temperature.

  FIG. 2 is a block diagram of a control drive system of the liquid property value measuring apparatus 10 (tuning fork vibration type viscometer) according to the present embodiment. This configuration is substantially the same as that of a conventional tuning fork vibration type viscometer. It does not change. Note that it does not matter whether the functional blocks shown in FIG. 2 are realized mainly by hardware using electronic components or mainly by software using a CPU program. The AD converter and other functional blocks may be included in the arithmetic processing unit 46 such as a microcomputer.

  First, the liquid property value measuring apparatus 10 of this embodiment includes an amplifier 30 to which an output signal of the displacement sensor 24 of the viscometer body 12 is input, a rectifier 32, a comparator to which an output from the rectifier 32 and a reference amplitude value are input. 34.

  Further, it has a controller 36 that receives the output signal of the comparator 34 and outputs a control signal to the automatic attenuator 38 according to the value. A constant drive signal, for example, a resonance drive signal of 30 Hz, is always input to the automatic attenuator 38. The automatic attenuator 38 controls the drive signal with a control signal sent from the controller 36, and the amplifier 30 Is supplied to each electromagnetic coil 22 of the electromagnetic drive unit 23.

  The drive current at this time is detected by the current detector 40 and input to the arithmetic processing unit 46 (microcomputer) via the I / V converter 42 and the A / D converter 44. An input signal of the sample temperature sensor 26 is input to the arithmetic processing unit 46 via the A / D converter 44.

  A memory 48, a display unit 50, and a key switch unit 52 are connected to the arithmetic processing unit 46. In the liquid property value measuring apparatus 10 having the above configuration, the current detector 40 measures the drive current to the electromagnetic coil 22 of the electromagnetic drive unit 23 when the vibrator 18 is caused to resonate with a predetermined amplitude value. The Then, based on the obtained value of the drive current and a predetermined calibration curve, the arithmetic processing unit 46 can calculate the viscosity of the liquid sample X that is the measurement object.

  The tuning fork vibration type viscometer body 12 of the type described above uses electromagnetic force and has a moving amount (variation amount, about 0.4 mm) at a frequency as low as several tens Hz (about 30 Hz in this embodiment). (Amplitude value) is applied to the vibrator 18 so that a large amount of energy is not applied to the sample X, and the slip generated at the interface between the sample X and the vibrator 18 is suppressed as much as possible, so that the composition of the sample X is not destroyed. Stable physical quantity detection is possible.

  In addition, the configuration of the comparator 34, the controller 36, and the like control the driving force of the vibrator 18 according to the physical quantity of the sample while keeping the amplitude value (displacement amount) of the vibrator 18 constant by electromagnetic force. Therefore, the mass meter can measure with high accuracy and a wide dynamic range like the analytical balance with the highest accuracy at present.

  In addition, since the vibrator 18 of the viscometer body 12 of the present embodiment is made of a thin metal, the heat capacity is small and there is little thermal interference with the sample X. At the same time, the fluctuation amount of the vibrator 18 at low frequency is the same as that of the sample X. Since even a small amount (about 10 ml) can be detected, the time required for the sample temperature to be constant can be shortened, and as a result, the viscosity can be measured with high accuracy and in a short time. Become.

  Here, the liquid property value measuring apparatus 10 of the present embodiment has notable features in the following points in addition to calculating the viscosity of the sample X by the above-described configuration.

  That is, in the liquid property value measuring apparatus 10 of the present embodiment, the “concentration, viscosity, and sample temperature” and / or the “density, viscosity, and sample temperature” in the memory 48 are previously stored in the “ The relative relationship between “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature” is stored for each sample (for example, saline, vinegar, sake, etc.) of different constituent materials.

  The arithmetic processing unit 46 calculates the viscosity of the sample X, which is a measurement object whose viscosity is unknown, and the calculated viscosity is stored in the memory 48 in advance with the temperature detected by the sample temperature sensor 26. Based on the relational expression, the concentration and / or density can be converted.

  In addition, the liquid property value measuring apparatus 10 of the present embodiment includes a sample temperature sensor 26, so that these property values can be accurately calculated even for a sample having a high temperature dependency of the property values. Although the memory 48 stores the relative relationship between “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature”, a sample whose physical property value is relatively low in temperature, or a sample that does not require measurement accuracy , The sample temperature sensor 26 is not an essential component, and only by storing the relative relationship of “concentration and viscosity” and / or “density and viscosity” in the memory 48, the calculated viscosity and the relative relationship Based on the above, conversion processing from viscosity to concentration and / or density may be performed.

  Next, specific contents of the storage process of the relational expression in the memory 48 and the conversion process performed by the arithmetic processing unit 46 will be described with reference to the flowcharts of FIGS. In the following, the case of calculating the viscosity and the concentration of the sample X whose viscosity and concentration are unknown will be described. However, instead of the concentration, the density or both the concentration and the density may be calculated.

  First, for a sample X (for example, a saline solution), when the relative relationship between “concentration, viscosity, and sample temperature” is known (S110), a relational expression of “concentration, viscosity, and sample temperature” (for example, c = Aη + BT: c = concentration, η = viscosity, T = sample temperature) is stored in the memory 48 by inputting from an input means (not shown) such as a key switch 52 or a keyboard (S120). When the density is to be obtained, the relational expression of “density, viscosity, and sample temperature” may be stored in the memory 48.

When the relative relationship between the “concentration, viscosity, and sample temperature” of the sample X is unknown (S110), a plurality of samples X _{1 to} X _n having different concentrations are prepared (S130), and each of the samples X _{1 to} X is prepared. _{For n} , the viscosity at each sample temperature is calculated by the arithmetic processing unit 46 while changing the sample temperature by a temperature controller such as a temperature controller (S140). Then, the arithmetic processing unit 46 represents the relative relationship between the viscosity at each concentration and the sample temperature based on the result of calculating the viscosity, and stores it in the memory 48 (S150). The sample temperature is a value detected by the sample temperature sensor 26, and the viscosity is calculated by the arithmetic processing unit 46 according to the configuration of the liquid property value measuring apparatus 10 described above.

In this example, saline solutions (samples X _{1 to} X ₃ ) having concentrations of 0%, 10%, and 20% were prepared and heated at a temperature controller (starting at 25 ° C., heating to 40 ° C.) every 5 ° C. Viscosity is calculated. The measurement result (relative relationship between the viscosity for each concentration and the sample temperature) is as shown in the graph of FIG. Based on this measurement result, when the relative relationship between the viscosity η of the samples X _{1 to} X ₃ and the sample temperature T is first-order approximated, the relative relationship between the concentration c, the viscosity η of the sample X and the sample temperature T (temperature T is a variable) The relative relationship between the concentration c and the viscosity η) is expressed by three formulas (1-1) to (1-3). These formulas are input from input means such as the key switch unit 52, and the memory 48. Is remembered.

η ₁ (c = 20%) = − 0.025T + 2.2 [mPa / s] (1-1)
η ₂ (c = 10%) = − 0.018T + 1.585 [mPa / s] (1-2)
η ₃ (c = 0%) = − 0.015T + 1.257 [mPa / s] (1-3)

  For example, the measurement results of viscosity and sample temperature (numerical values of viscosity and sample temperature for each concentration) and the graph itself of FIG. 6 are stored in the memory 48, and calculation is performed based on these measurement results (numerical values) and graphs. The processing unit 46 may automatically calculate the relational expressions (1-1) to (1-3) of the concentration c, the viscosity η, and the sample temperature T of the sample X and store them in the memory 48. .

For example, when it is known in advance that the viscosity has almost no temperature dependence, after preparing a plurality of samples X _{1 to} X _n having different concentrations, the sample temperature is kept constant (for example, 25 ° C.). The viscosities may be calculated for the samples X _{1 to} X _{n having} the respective concentrations, and the relative relationship between the viscosities and the concentrations may be calculated and stored in the memory 48. FIG. 7 shows an example of a graph representing the relative relationship between the concentration and the viscosity of the sample having no temperature dependence.

From the measurement result of FIG. 7, when a second order approximation is performed, the relational expression between the concentration and the viscosity is expressed by c = −31.71η ² + 106.59η−69.24 [%] (2-1). The relational expression is input by input means such as the key switch unit 52 and stored in the memory 48.

  In addition, the procedure of S110-150 mentioned above may be similarly performed not only about the sample X but other samples Y (for example, liquor) and Z (for example, sugar water). Moreover, the procedure of S110-150 about sample Y, Z may be performed just before calculating the density | concentration of sample Y, Z which is a measuring object whose physical property value is unknown in the flow mentioned later.

  Further, when relational expressions are stored in advance in the memory 48 for all of the samples X, Y, and Z, when calculating the concentration of each measurement object, whether the type of the sample is X, Y, or Z, It is necessary to select and input from input means such as the key switch unit 52. If the relational expressions are stored in the memory 48 for a plurality of types of samples, the arithmetic processing unit 46 can always call the relational expressions corresponding to the measurement object from the memory 48 to obtain the viscosity and concentration of an arbitrary sample. Can contribute to speeding up the measurement.

Next, the liquid property value measuring apparatus 10 calculates the viscosity η ₀ of the sample X (saline solution) that is the measurement object whose viscosity and concentration are unknown, detects the sample temperature T ₀ from the sample temperature sensor 26, and These are stored in the memory 48 (S210). The viscosity η ₀ is calculated by the arithmetic processing unit 46 as in the previous flow, and the temperature T ₀ is a value detected from the sample temperature sensor 26. In this embodiment, η ₀ = 1.27 [mPa · s] and T ₀ = 27.5 [° C.].

Here, when there is one relational expression of “concentration, viscosity, and specimen temperature” of the sample X previously stored in the memory 48 (S220), the arithmetic processing unit 46 stores the relational expression in the memory 48. And η ₀ and T ₀ obtained previously are respectively substituted into the variable η (viscosity) and the variable T (sample temperature) in the relational expression to calculate the concentration c (S230). For example, in the case of a sample whose viscosity does not depend on temperature, since one relational expression between the concentration c and the viscosity η is stored in the memory 48, for example, the variable η in the above equation (2-1) is represented by η ₀ Is substituted, the concentration c of the sample X is calculated.

Further, when there are a plurality of relational expressions of “concentration, viscosity, and sample temperature” as in the above formulas (1-1) to (1-3) (S220), the arithmetic processing unit 46 determines that the relation The equations are called from the memory 48, and T ₀ is substituted into the variable T of each equation to calculate the viscosities η _{1 to} η ₃ at each concentration c (S240).

Specifically, when T ₀ = 27.5 is substituted for each variable T in the relational expressions (1-1) to (1-3), and the viscosity at 27.5 ° C. is calculated for each concentration, Equations (3-1) to (3-3) are obtained.

η ₁ (c = 20%) = 1.51 [mPa · s] (3-1)
η ₂ (c = 10%) = 1.09 [mPa · s] (3-2)
η ₃ (c = 0%) = 0.84 [mPa · s] (3-3)

  If the expressions (3-1) to (3-3) are expressed in a graph as the relative relationship between the concentration and the viscosity, the result is as shown in FIG. When the relative relationship between the concentration and the viscosity is expressed by an expression based on this graph or the numerical values (viscosity and concentration) of the expressions (3-1) to (3-3), the expression (4-1) is obtained. The equation (4-1) is obtained by the second order approximation.

c = −24.17η ² + 86.64η−55.73 [%] (4-1)

  That is, the arithmetic processing unit 46 calculates a relational expression between the concentration and the viscosity at the sample temperature To detected by the sample temperature sensor 26, and stores it in the memory 48 (S250).

The arithmetic processing unit 46 calls the relational expression (4-1) stored in the memory 48, substitutes η ₀ = 1.27 for the variable η in the expression (4-1), and calculates the concentration c (S260). ). Specifically, c = −24.17 (1.27) ² +86.64 (1.27) −55.73 = 15.3 [%].

  For confirmation, the sample X has a concentration at the time of T = 27.5 ° C. measured by a measuring instrument other than the liquid physical property measuring device 10, which is 15%. 10, it was found that the concentration was correctly measured.

  The display unit 50 displays the viscosity and concentration calculated by the arithmetic processing unit 46 and the sample temperature detected by the sample temperature sensor 26 (S270).

  According to the liquid property value measuring apparatus 10 configured as described above, the relative relationship between “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature” stored in the memory 48 in advance is used. Based on the viscosity calculated for the object to be measured and the detected sample temperature, the concentration and / or density is converted. Therefore, not only the viscosity but also a plurality of physical properties such as concentration and density can be obtained with a single device. The value can be obtained.

  Furthermore, in addition to the relative relationship between “concentration and viscosity” or “density and viscosity”, the sample temperature is added as a variable, so in particular for samples with high temperature dependence, the sample temperature is kept constant using a thermostatic chamber or the like. Therefore, it is possible to measure a plurality of physical property values at an arbitrary sample temperature, which contributes to rapid measurement.

  In addition, for samples whose relative relationship between “concentration, viscosity, and sample temperature” or “density, viscosity, and sample temperature” is unknown, these samples can be measured by changing the sample temperature and measuring the viscosity with samples of different concentrations. Thus, the concentration and density can be obtained.

  Further, since the relative relationship of “concentration, viscosity, and sample temperature” or “density, viscosity, and sample temperature” is stored in the memory 48, the arithmetic processing unit 46 detects the detected sample temperature based on this relative relationship. It is also possible to convert the physical property value at to a physical property value at a predetermined sample temperature. With this configuration, for example, when performing sample management and sample evaluation, facilities and labor for maintaining the sample temperature at a constant level are not required, and capital investment can be reduced and management and evaluation can be facilitated.

  In the conventional sample management, the management accuracy of the sample temperature has a great influence on the measurement accuracy of the physical property value. In particular, when the vibrator 18 of the viscometer body 12 is a thin metal plate. The vibrator 18 has a small heat capacity, and it is not necessary to measure the physical property value while managing the temperature of the sample. Therefore, the time required for the evaluation management of the sample is shortened, and the measurement accuracy of the physical property value is maintained.

  In addition, if the tuning fork vibration type viscometer body 12 that requires a small amount of the sample at the same time as the heat capacity of the vibrator 18 immersed in the sample is small, the stabilization time of the sample temperature is short. Physical property measurement, sample evaluation and management are possible.

Improvements in measurement accuracy, measurement time and management evaluation time for various physical quantities required for machine oils and greases, liquid crystal resists, printing inks, and other industrial liquids are directly linked to productivity on the factory line. At the same time, it leads to improvement of product quality, which is an important issue for each company, and according to the present invention, it is possible to propose an improvement in management evaluation level of liquid samples to the industrial liquid market.

  As mentioned above, although it demonstrated per Example of the liquid physical property value measuring apparatus 10, the liquid physical property value measuring apparatus of this invention is not limited to the liquid physical property value measuring apparatus provided with all the structural requirements demonstrated in the said Example. Various changes and modifications are possible. It goes without saying that such changes and modifications also belong to the scope of the claims of the present invention.

  For example, the memory 48 for storing the relational expression and the arithmetic processing unit 46 for converting the concentration and / or density need to be configured integrally with the other constituent means of the liquid property value measuring apparatus 10 of the previous embodiment. Alternatively, an external device 13 such as a computer installed outside may be included. FIG. 3 shows an example of a control system block diagram of the liquid property value measuring apparatus 10a in this case. 3 is the same as that of the configuration means other than the memory 48 and the arithmetic processing unit 46 in FIG. 2, and the viscometer body 12a in FIG. 3 has the liquid property value measurement in FIG. Only a part of the configuration of the apparatus 10 is extracted, and the others are omitted.

  The external device 13 illustrated in FIG. 3 includes an arithmetic processing unit 46, a memory 48 connected to the arithmetic processing unit 46, an input unit 52a, and a display unit 50. The external device 13 and the viscometer main body 12a are connected by communication means 54 provided in each, and the external device 13 and the viscometer main body 12a constitute a liquid property value measuring device 10a.

The arithmetic processing unit 46 and the memory 48 may be provided in the external device 13 and the viscometer main body 12a, respectively. In this case, the arithmetic processing unit 46 on the viscometer main body 12a side calculates the viscosity. And the processing unit 46 on the external device 13 side has a function of calculating the concentration and / or density from the viscosity. Accordingly, the external device 13 employs a commercially available computer, the viscometer body 12a employs a conventional tuning fork vibration type viscometer, and only has a communication function for transmitting the viscosity value to the outside. . In addition, since bidirectional communication is not always necessary, a tuning fork vibration viscometer with an external output terminal may constitute the viscometer body 12a.

It is a side view of the drive mechanism part of a liquid physical property value measuring apparatus. It is a control block diagram which shows the electrical structure of a liquid physical property value measuring apparatus. It is another control block diagram which shows the electric constitution of a liquid physical property value measuring apparatus. It is a flowchart figure which shows the procedure at the time of memorize | stored a relational expression with the liquid physical property value measuring apparatus concerning this invention. It is a flowchart figure which shows the procedure at the time of calculating a density | concentration with the liquid physical property value measuring apparatus concerning this invention. It is a graph which shows the relative relationship of a viscosity and sample temperature for every density | concentration. It is a graph which shows the relative relationship of a viscosity and a density | concentration. It is a graph which shows the relative relationship of the viscosity in the sample temperature of 27.5 degreeC, and a density | concentration.

Explanation of symbols

10: Liquid property value measuring device 12: Viscometer body 13: External device 14: Frame 16: Leaf spring 18: Vibrator 20: Magnet 22: Electromagnetic coil 23: Electromagnetic drive unit 24: Displacement sensor 26: Sample temperature sensor 30: Amplifier 32: Rectifier 34: Comparator 36: Controller 38: Automatic attenuator 40: Current detector 42: I / V converter 44: A / D converter 46: Arithmetic processing unit 48: Memory 50: Display unit 52: Key switch part (input part)
54: Communication means

Claims (8)

A liquid property value measuring apparatus for measuring a physical property value of a liquid sample as a measurement object,
Two or more pairs of transducers are driven by electromagnetic force generated by a combination of a magnetic circuit composed of a magnet and a yoke and an electromagnetic coil, and the amount of fluctuation of the driven transducers is measured and detected by a displacement sensor. A tuning-fork vibratory viscometer body,
An arithmetic processing unit that calculates the viscosity of the sample based on the numerical value obtained from the viscometer body,
A memory for storing the viscosity calculated by the arithmetic processing unit,
The viscometer body is
A sample temperature sensor for detecting the temperature of the sample;
In the memory,
The relative relationship between the “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature” of the sample is stored in advance,
The arithmetic processing unit includes:
The liquid property value measuring apparatus, wherein the viscosity calculated for the sample is converted into a concentration and / or density based on the sample temperature detected by the sample temperature sensor and the relative relationship.
The arithmetic processing unit includes:
If the relative relationship is unknown,
For a plurality of samples having different concentrations and / or densities, the viscosity is calculated by changing the sample temperature, and an approximate expression is calculated from the relative relationship between the concentration and viscosity and / or the density and viscosity using the sample temperature as a parameter. It memorize | stores in the said memory. The liquid physical property value measuring apparatus of Claim 1 characterized by the above-mentioned.
The arithmetic processing unit includes:
The calculated viscosity and the converted concentration and / or density are converted into values at a predetermined temperature based on the relative relationship stored in the memory. 2. The liquid property value measuring apparatus according to 2.
The relative relationship is
Stored in the memory for each sample of different constituent materials,
The arithmetic processing unit includes:
The liquid property value measuring device according to any one of claims 1 to 3, wherein the relative relationship corresponding to a measurement object is called from the memory in response to a selection input of a sample type from an input unit. .
A liquid property value measurement method for measuring a property value of a liquid sample as a measurement object,
A first step of storing in advance a relative relationship between “concentration, viscosity, and sample temperature” and / or “density, viscosity, and sample temperature” of the sample in a memory;
Two or more pairs of transducers are driven by electromagnetic force generated by a combination of a magnetic circuit composed of a magnet and a yoke and an electromagnetic coil, and the amount of fluctuation of the driven transducers is measured and detected by a displacement sensor. A second process of converting the viscosity of the sample calculated by a tuning-fork vibration viscometer of the type into a concentration and / or density based on the sample temperature detected by a sample temperature sensor and the relative relationship A method for measuring liquid property values.
When the relative relationship is unknown, in the first process,
For a plurality of samples having different concentrations and / or densities, the viscosity is calculated by changing the sample temperature, and an approximate expression is calculated from the relative relationship between the concentration and viscosity and / or the density and viscosity using the sample temperature as a parameter. It memorize | stores in the said memory. The liquid physical property value measuring method of Claim 5 characterized by the above-mentioned.
The liquid property value measuring method is:
6. The method according to claim 5, further comprising a third step of converting the calculated viscosity and the converted concentration and / or density into a value at a predetermined temperature based on the relative relationship. Item 7. The liquid property value measuring method according to Item 6.
The relative relationship is
It is stored in the memory for each sample having different constituent materials,
In the second step,
The liquid property value measuring method according to any one of claims 5 to 7, wherein the relative relationship corresponding to a measurement object is called from the memory in accordance with a selection input of a sample type.

Images