JP2007322268A - Concentration measuring device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concentration measuring device capable of measuring the concentration of a measuring object in a solid sample easily, accurately and nondestructively. <P>SOLUTION: This concentration measuring device is equipped with a housing, including an insulating member having the first and second through holes, the first and second rod-like electrodes each of which is engaged respectively with the first and second through holes and extended from the insulating member to be inserted into the solid sample; a power source means for supplying the power between the first and second electrodes; a detection means for detecting at least either of a voltage between the first and second electrodes and a current flowing between the first and second electrodes; a temperature sensor supported by the housing to be inserted into the solid sample, together with the first and second electrodes; a calculation means for calculating the concentration of the measuring object in the solid sample, based on a current value or a voltage value detected by the detection means and a temperature of the solid sample measured by the temperature sensor; and a display means for displaying the concentration calculated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a concentration measuring apparatus and a concentration measuring method for measuring a salt concentration of, for example, fish meat.

  As a salinity meter used to measure the salinity of a liquid sample, one that measures the electrical conductivity of a liquid sample and obtains the salinity from the correlation between the electrical conductivity and the salinity is known (Patent Literature). 1).

FIG. 9 is an explanatory view schematically showing a measurement principle of a conventional salinity concentration measuring apparatus. As shown in the figure, two electrodes 103 and 104 are inserted into a container 101 filled with a saline solution 102, and an AC voltage is applied between the two electrodes 103 and 104 from a power source 105. Then, a current flows in the saline 102 through a route indicated by arrows Y1 and Y2 in the figure. This current is measured by an ammeter 106, and (measurement current) / (applied voltage) is calculated to obtain the electrical conductivity g of the saline solution 102. And based on the correspondence (FIG. 8) of electrical conductivity and salt concentration, the salt concentration corresponding to electrical conductivity g is calculated | required.
JP 2002-5862 A

  However, when examining the salt concentration in a solid sample such as a salted meat or fish salted product, the above-described conventional salt concentration meter has a problem that the electrode is too thick to be inserted into the sample. Therefore, a part of the solid sample was collected, ground by adding water, and measurement had to be performed using a liquid sample obtained by filtering the sample. Therefore, there are problems such as (1) it takes time and labor to make a liquid sample, and (2) it takes a part of the solid sample and damages the solid sample. .

  The present invention has been made in order to solve such a conventional problem, and its purpose is a concentration capable of measuring the concentration of a measurement object in a solid sample nondestructively and easily with high accuracy. It is to provide a measuring device.

In order to achieve the above object, a concentration measuring apparatus according to the present invention provides:
A concentration measuring device for measuring the concentration of a measurement object contained in a solid sample,
A housing including an insulating member having first and second through holes;
First and second rod-shaped electrodes extending from the insulating member so that each fits into each of the first and second through holes and is inserted into the solid sample;
Power supply means for supplying power between the first and second electrodes;
Detecting means for detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes;
A temperature sensor supported by the housing for insertion into the solid sample along with the first and second electrodes;
Calculation means for calculating the concentration of the measurement object in the solid sample based on the current value or voltage value detected by the detection means and the temperature of the solid sample measured by the temperature sensor;
Display means for displaying the calculated concentration;
Is provided.

Preferably, the diameter of the first and second electrodes is 0.5 mm to 2.0 mm,
The length of the portion extending from the housing of the first and second electrodes is 1 mm to 15 mm,
The first and second electrodes are arranged in parallel with each other at an interval of 1 mm to 10 mm;
A temperature sensor is disposed 1 mm to 10 mm apart from the first and second electrodes.

  Preferably, the first and second electrodes are shrink-fitted into the first and second through holes or integrated with the insulating member by insert molding.

  Further preferably, the housing includes a main body housing including power supply means, detection means, calculation means, and display means, and a probe housing supporting the first and second electrodes and the temperature sensor, and the probe housing includes the main body. It is detachably connected to the housing.

The concentration measuring method according to the present invention is as follows:
A method for measuring the concentration of a measurement object contained in a solid sample using a concentration measuring device for solid material, the device comprising: a housing including an insulating member having first and second through holes; Between the first and second electrodes and the first and second electrodes that fit into each of the first and second through holes and extend from the insulating member so as to be inserted into the solid sample Power supply means for supplying power, detection means for detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes, and first and second Based on the temperature sensor supported by the housing so as to be inserted into the solid sample together with the electrode, the current value or voltage value detected by the detection means, and the temperature of the solid sample measured by the temperature sensor, A calculation means for calculating the concentration of the measurement object; Equipped with, method,
Inserting the first and second electrodes and the temperature sensor into the solid sample;
Supplying power between the first and second electrodes;
Detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes;
Measuring the temperature of the solid sample;
Calculating the concentration of the measurement object in the solid sample based on the detected current value or voltage value and the measured temperature;
including.

  According to the present invention, since a thin electrode can always be inserted into a solid sample of a certain length, the concentration measurement that can measure the concentration of the measurement object in the solid sample nondestructively and easily with high accuracy An apparatus can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an external view of a salinity concentration measuring apparatus 10 according to an embodiment of the present invention. As illustrated, the salinity concentration measuring apparatus 10 includes a main body 12 and a probe 14 detachably connected to the main body 12.

  The main body 12 has a housing structure that is entirely covered by the main body housing 16, and displays operation switches 18a and 18b for performing operations such as start of measurement and zero adjustment, and a salinity concentration as a measurement result. And a display section (display means) 20 such as a liquid crystal display. In addition, a substrate (not shown) on which various electronic components such as detection means and calculation means described later are mounted is provided inside the main body 12.

  The probe 14 includes a probe housing 22, a first electrode 24, a second electrode 26 and a temperature sensor 28 extending in parallel with each other from one end of the probe housing 22, and a cable 30 extending from the other end of the probe housing 22, It has.

  FIG. 2 is a cross-sectional view of the probe housing 22. As shown in the figure, the probe housing 22 has a cylindrical part 32 made in a size and shape that can be easily held by a measurer, and is supported by one end of the cylindrical part 32, and a pair of electrodes 24, 26 and a temperature sensor 28. And a boot 36 supported by the other end of the cylindrical portion 32 and supporting the cable 30 (FIG. 1). The tubular portion 32 and the insulating member 34 are engaged with each other, and an O-ring 38 is provided between the tubular portion 32 and the insulating member 34. Similarly, the tubular portion 32 and the boot 36 are engaged with each other, and an O-ring 40 is provided between the tubular portion 32 and the boot 36.

  FIG. 3 is a perspective view showing the insulating member 34 in a state removed from the cylindrical portion 32. 4 is a rear view of the insulating member 34 of FIG. 5 and 6 are cross-sectional views of the insulating member 34 taken along lines V and VI in FIG.

  As shown in FIG. 5, the insulating member 34 has a flat end face 42 that is brought into contact with a solid sample, and first and second through holes 44, into which the first and second electrodes 24 and 26 are fitted, respectively. 46 and a third through hole 48 (FIG. 6) into which the temperature sensor 28 is fitted. The insulating member 34 is made of an insulating material such as ABS resin (acrylonitrile-butadiene-styrene resin), for example, and defines a length L1 of a portion extending from the insulating member 34 of the first and second electrodes 24 and 26.

  The first and second electrodes 24 and 26 are made of, for example, brass plated with nickel base gold and have an elongated rod shape. More specifically, the diameter D1 of the first and second electrodes 24 and 26 is 0.5 mm to 2.0 mm, and the length of the portion extending from the insulating member 34 of the first and second electrodes 24 and 26 is. (Extension length) L1 is 1 mm to 15 mm, and the distance D2 between the first and second electrodes 24 and 26 is preferably 1 mm to 10 mm.

  As shown in FIG. 6, the temperature sensor 28 includes a sensor main body (not shown) and a protective member made of, for example, stainless steel that covers the sensor main body, and has an elongated bar shape. More specifically, the diameter D3 of the temperature sensor 28 is 0.5 mm to 1.5 mm, and the length (extension length) L2 of the portion extending from the insulating member 34 of the temperature sensor 28 is the first and second lengths. Like the electrodes 24 and 26, it is preferable that it is 1 mm-15 mm.

  These electrodes 24 and 26 and the temperature sensor 28 are made of a rigid material in the shape of an elongated bar and extend parallel to each other, so that they can be easily inserted into a solid sample. Moreover, since the cross-sectional dimensions of the electrodes 24 and 26 and the temperature sensor 28 inserted into the solid sample are small, damage to the solid sample can be reduced.

  More specifically, the first and second electrodes 24 and 26 are shrink-fitted into the first and second through holes 44 and 46, respectively. Thereby, even if the electrodes 24 and 26 are repeatedly inserted into the solid sample, a gap is generated between the electrodes 24 and 26 and the insulating member 34, and the liquid contained in the solid sample can be prevented from penetrating into the gap. In addition, it is possible to prevent the electrodes 24 and 26 from moving relative to the insulating member 34 and changing the length L1 of the extended portions of the electrodes 24 and 26. Therefore, by inserting the electrodes 24 and 26 into the sample until the end face 42 of the insulating member 34 comes into contact with the solid sample, the surface area of the portion disposed in the solid sample of the electrodes 24 and 26 can be always constant. It is possible to accurately measure the salinity.

  The third through hole 48 is formed at an equal distance of 1 mm to 10 mm from each of the first and second through holes 44 and 46. The temperature sensor 28 is shrink-fitted into the third through hole 48 and is preferably fixed at a position of 1 mm to 10 mm from each electrode 24, 26. Thereby, the temperature of the measurement site | part of a solid sample can be measured, without affecting the electric field formed between the electrodes 24 and 26, and exact salt concentration can be calculated | required according to this temperature.

  Referring back to FIG. 2, a probe substrate 50 to which the electrodes 24 and 26 and the temperature sensor 28 are connected is provided in the probe housing 22. The probe board 50 is connected to the cable 30 (FIG. 1) (not shown in FIG. 2), and is connected to a board (not shown) inside the main body 12 via a connector 52 (FIG. 1). The connector 52 is preferably a water-resistant connector. In this way, since the probe 14 is detachably connected to the main body 12, when the electrodes 24, 26 or the temperature sensor 28 is damaged, only the probe 14 can be replaced instead of the entire apparatus. There is an advantage that the device can be easily carried by removing the probe 14.

  Further, the configuration of the main body 12 described below is substantially the same as that of a conventional salinity concentration measuring apparatus for a liquid sample. Therefore, the main body 12 is manufactured in the same manner as the conventional liquid sample device by making the portion 52a of the connector 52 on the main body 12 side into a shape and structure compatible with the sample stage in the conventional liquid sample device. Can do. Thereby, it becomes possible to manufacture the apparatus for solid samples at low cost.

  FIG. 7 is a block diagram showing the control unit 54 of the salinity concentration measuring apparatus 10 provided on the substrate inside the main body 12. As shown in the figure, the control unit 54 includes a signal generator (power supply means) 56 that generates an AC voltage signal having a predetermined frequency, and an output amplifier circuit 58 that amplifies the AC signal output from the signal generator 56. . The output terminal of the output amplifier circuit 58 is connected to the second electrode 26 via the shunt resistor 60. Further, the first electrode 24 is grounded.

  Further, the second electrode 26 is connected to a voltage detection circuit (detection means) 62 that detects a voltage applied to the second electrode 26. Further, both ends of the shunt resistor 60 are connected to a current detection circuit (detection means) 64, and the current detection circuit 64 obtains a current flowing through the shunt resistor 60 based on a voltage generated in the shunt resistor 60.

  Each output terminal of the current detection circuit 64 and the voltage detection circuit 62 is connected to an AD conversion circuit 66 for converting an analog signal detected by each detection circuit into a digital signal, and the output terminal of the AD conversion circuit 66 is a calculation means. (CPU) 68 is connected. The calculation means 68 is provided with characteristic data (calibration curve equation) indicating the relationship between the electric conductivity and the salinity concentration as shown in FIG. 8, and a temperature sensor 28 is connected.

  The calculation means 68 obtains the electrical conductivity g of the solid sample between the second electrode 26 and the first electrode 24 based on the current detected by the current detection circuit 64 and the voltage detected by the voltage detection circuit 62. The calculating means 68 further obtains the salinity concentration of the solid material by correcting the value obtained by substituting the electrical conductivity g into the characteristic data according to the temperature T of the solid material detected by the temperature sensor 28.

  The display unit 20 displays the salinity concentration obtained by the calculation means 68.

  Next, the processing operation of the salinity concentration measuring apparatus 10 configured as described above will be described.

  When an activation signal is sent from the calculation means 68 to the signal generator 56 with the first and second electrodes 24 and 26 inserted into the solid sample, an alternating voltage signal having a predetermined frequency is output from the signal generator 56. The

  The output voltage signal is amplified by the output amplifier circuit 58 and then applied to the second electrode 26 via the shunt resistor 60. Since the first electrode 24 is grounded to the ground, a current flows from the second electrode 26 toward the first electrode 24 in the solid sample.

  When a current flowing between the two electrodes 24 and 26 flows to the shunt resistor 60, a voltage having a magnitude proportional to the current is generated at both ends of the shunt resistor 60. The current detection circuit 64 detects the current flowing through the shunt resistor 60 based on the voltage generated in the shunt resistor 60 and the resistance value of the shunt resistor 60. The detected current data is digitized by the AD conversion circuit 66 and output to the calculating means 68.

  The voltage generated at the second electrode 26 is detected by the voltage detection circuit 62. The detected voltage is digitized by the AD conversion circuit 66 and output to the calculation means 68. Further, the temperature T of the solid sample measured by the temperature sensor 28 is sent to the calculation means 68.

  Thereafter, the calculation means 68 obtains the electrical conductivity g from the detected voltage (V) and current (I) using the relational expression g = I / V. This electric conductivity g is substituted into characteristic data as shown in FIG. 8, and the obtained value is corrected by the temperature T of the solid sample, whereby the salinity concentration is obtained. The salinity concentration data is output to the display unit 20, and the salinity concentration of the solid sample is displayed on the display unit 20.

  As described above, in the salinity measuring apparatus 10 according to the present embodiment, the electrodes 24 and 26 and the temperature sensor 28 are made of a solid material in the shape of an elongated bar and extend parallel to each other. Can be plugged in. Therefore, the measurement work can be simplified as compared with the conventional case.

  Moreover, since the cross-sectional dimensions of the electrodes 24 and 26 and the temperature sensor 28 inserted into the solid sample are small, damage to the solid sample can be reduced. Therefore, it is not necessary to discard the solid sample used for the measurement.

  Further, since the electrodes 24 and 26 are shrink-fitted into the through holes 44 and 46 of the insulating member 34, a gap is generated between the electrodes 24 and 26 and the insulating member 34, and the electrodes 24 and 26 are formed in the insulating member 34. On the other hand, it is possible to prevent the extension length L1 of the electrodes 24 and 26 from being changed relative to each other. Therefore, by inserting the electrodes 24 and 26 into the sample until the end face 42 of the insulating member 34 comes into contact with the solid sample, the surface area of the portion disposed in the solid sample of the electrodes 24 and 26 can be always constant. It is possible to accurately measure the salinity.

  Further, since the temperature sensor 28 is shrink-fitted into the through hole 48 of the insulating member 34 and is disposed at a predetermined distance from each of the electrodes 24 and 26, the temperature sensor 28 is solid without affecting the electric field formed between the electrodes 24 and 26. It becomes possible to measure the temperature of the measurement site of the sample. Therefore, an accurate salt concentration can be obtained according to the temperature of the solid sample.

  Furthermore, since the probe 14 is detachably connected to the main body 12, when the electrodes 24, 26 or the temperature sensor 28 is damaged, only the probe 14 can be replaced instead of the entire apparatus. There is an advantage that the device can be easily carried by removing the.

  Salmon fillets with different salinity concentrations were used as the solid material, and the salinity concentration measured with the salinity measuring device for solid samples according to the present invention was compared with the salinity concentration measured with the conventional salinity measuring device for liquid samples.

  More specifically, three Russian sockeye salmon dresses were dropped, the central part on the back side was cut into a 2 cm width, and a plurality of fillets were prepared. Each fillet immersed in 20% salt water for 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 8 hours, 16 hours, 2%, 3 hours, 4 hours, 5 hours in 25% salt water A sample immersed for 16 hours and 24 hours and a sample immersed in 15% salt water for 10 minutes, 8 hours, and 16 hours were each stored in a refrigerator for about 1 day in a vacuum pack.

Thereafter, first, an apparatus for a solid sample according to the present invention (the diameter of the first and second electrodes: 0.5 mm
The length of the first and second electrodes is 5 mm, the distance between the first and second electrodes is 2.5 mm, and the distance between the first and second electrodes and the thermometer is 5 mm. The salinity of each fillet was calculated at 10 ° C, 15 ° C, and 20 ° C.

  Next, a sample of 3 cm × 3 cm × 2 cm (about 20 g) including the part used for the measurement with the solid sample apparatus is taken from each fillet to make a liquid sample, and the salt concentration thereof is used for the conventional liquid sample. It measured using the apparatus of.

Table 1 shows the salinity g ₁ as measured by conventional apparatus, the temperature is 5 ° C., 10 ° C., 15 ° C., and salinity g ₂ measured by the apparatus according to the present invention with reference to the fillet 20 ° C., the.

As shown in Table 1, regardless of the temperature of the sample, the salinity concentration g ₂ measured with the apparatus according to the present invention is generally in good agreement with the salinity concentration g ₁ measured with the conventional apparatus. More specifically, the correlation coefficient between the salt concentrations g ₁ and g ₂ was 0.96 or more at any temperature. Moreover, the ratio g ₂ / g ₁ of the salinity concentration g ₂ measured with the device according to the present invention to the salinity concentration g ₁ measured with the conventional device has an allowable range of 0.7 to 1.5, which is surprising. And 0.80 to 1.35. Therefore, it can be seen that the salinity concentration measuring apparatus according to the present invention can accurately detect the salinity concentration of the solid sample even when the temperature of the solid sample is different.

  In short, the concentration measuring apparatus 10 according to the present invention has the following features.

1. A concentration measuring device 10 for measuring the concentration of a measurement object contained in a solid sample,
A housing 22 including an insulating member 34 having first and second through holes 44, 46;
First and second rod-like electrodes 24, 26 extending from the insulating member 34, each fitted into each of the first and second through holes 44, 46 and inserted into the solid sample;
Power supply means 56 for supplying power between the first and second electrodes 24, 26;
Detecting means 62 and 64 for detecting at least one of a voltage between the first and second electrodes 24 and 26 and a current flowing between the first and second electrodes 24 and 26;
A temperature sensor 28 supported by the housing 22 so as to be inserted into the solid sample together with the first and second electrodes 24, 26;
Calculation means 68 for calculating the concentration of the measurement object in the solid sample based on the current value or voltage value detected by the detection means 62 and 64 and the temperature of the solid sample measured by the temperature sensor 28;
Display means 20 for displaying the calculated concentration;
Is provided.

2. The diameter D1 of the first and second electrodes 24 and 26 is 0.5 mm to 2.0 mm,
The length L1 of the portion extending from the housing 22 of the first and second electrodes 24, 26 is 1 mm to 15 mm,
The first and second electrodes 24 and 26 are arranged in parallel with each other at a distance D2 of 1 mm to 10 mm,
The temperature sensor 28 is disposed 1 mm to 10 mm away from the first and second electrodes 24 and 26.

3. The 1st and 2nd electrodes 24 and 26 are shrink-fitted in the 1st and 2nd through-holes 44 and 46, or are integrated with the insulating member 34 by insert molding.

4). The housing includes a main body housing 16 including power supply means, detection means, calculation means, and display means, and a probe housing 22 that supports the first and second electrodes 24, 26 and the temperature sensor 28. The main body housing 16 is detachably connected.

  The concentration measuring method according to the present invention has the following characteristics.

5). A method for measuring the concentration of a measurement object contained in a solid sample using the solid-material concentration measuring device 10, the device including an insulating member 34 having first and second through holes 44, 46. A housing 22, and first and second rod-like electrodes 24 extending from the insulating member 34 so as to fit into the first and second through holes 44 and 46, respectively, and to be inserted into the solid sample. 26, power supply means 56 for supplying power between the first and second electrodes 24, 26, the voltage between the first and second electrodes 24, 26, and the first and second electrodes 24, 26. Detecting means 62, 64 for detecting at least one of the currents flowing between them, a temperature sensor 28 supported by the housing 22 so as to be inserted into the solid sample together with the first and second electrodes 24, 26, Current value detected by detecting means 62, 64 Others on the basis of the temperature of the solid sample is measured by the voltage value and the temperature sensor 28, a calculation unit 68 for calculating the concentration of the measurement object of a solid sample, comprising a method,
Inserting the first and second electrodes 24, 26 and the temperature sensor 28 into the solid sample;
Supplying power between the first and second electrodes 24, 26;
Detecting at least one of a voltage between the first and second electrodes 24 and 26 and a current flowing between the first and second electrodes 24 and 26;
Measuring the temperature of the solid sample;
Calculating the concentration of the measurement object in the solid sample based on the detected current value or voltage value and the measured temperature;
including.

  And the density | concentration measuring apparatus by this invention has the following effects by the said characteristic.

1. Measurement work can be facilitated.

2. Damage to the solid sample can be reduced.

3. The concentration can be measured with high accuracy.

4). The probe is replaceable.

5. The device can be manufactured at low cost.

6). The device is easy to carry.

  The concentration measuring apparatus of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. Can do.

  For example, in the above-described embodiment, the electrode and the temperature sensor are fixed to the insulating member by shrink fitting, but the insulating member may be integrated with the electrode and the temperature sensor by insert molding, or the electrode and the temperature sensor may be integrated. You may press-fit into the through-hole of an insulating member. In this case, an anchor is preferably provided in the probe housing so that the electrode and the temperature sensor are not retracted.

  In the above-described embodiment, the insulating member is made of ABS resin, but materials such as POM (polyoxymethylene) resin (acetal resin) can also be used as the insulating member.

  Furthermore, in the above-described embodiment, the voltage detection circuit is used to measure the voltage between the two electrodes. However, the voltage output from the output amplifier circuit is assumed to be the voltage between the two electrodes. It is also possible to measure the rate. With such a configuration, the voltage detection circuit can be omitted, so that the circuit configuration can be simplified.

  In the above-described embodiment, a constant level AC voltage signal is output from the signal generator, and the electrical conductivity is obtained based on the current flowing at this time, but the constant level AC current signal is output from the signal generator. And the electrical conductivity may be obtained by measuring the voltage generated between the two electrodes at this time.

  Furthermore, in the above-described embodiment, the salinity concentration measuring device for measuring the salinity concentration contained in the saline solution has been described as an example. However, the concentration measuring device according to the present invention is not limited to this, and liquid It is also possible to employ other substances to be measured whose electric conductivity changes depending on the concentration of the substance dissolved therein.

  This is extremely useful for measuring the salinity concentration in a solid sample easily and accurately.

It is an external view of the density | concentration measuring apparatus by one Embodiment of this invention. It is sectional drawing of a probe housing. It is a perspective view which shows the insulating member of the state removed from the cylindrical part. It is a rear view of the insulating member of FIG. It is sectional drawing of the insulating member in the line V of FIG. FIG. 5 is a cross-sectional view of the insulating member taken along line VI in FIG. 4. It is a block diagram which shows the structure of the control part of a density | concentration measuring apparatus. It is a characteristic view which shows the relationship between salt concentration and electrical conductivity. It is explanatory drawing which shows the measurement principle of the conventional salt concentration measuring apparatus.

Explanation of symbols

10 Salinity concentration measuring device (concentration measuring device)
12 Body 14 Probe 16 Body housing 18a, 18b Operation switch 20 Display section (display means)
22 Probe housing 24 1st electrode 26 2nd electrode 28 Temperature sensor 30 Cable 32 Cylindrical part 34 Insulating member 36 Boot 38, 40 O-ring 42 End surface 44 1st through-hole 46 2nd through-hole 48 3rd Through hole 50 Probe board 52 Connector 54 Control unit 56 Signal generator (power supply means)
58 output amplifier circuit 60 shunt resistor 62 voltage detection circuit 64 current detection circuit 66 AD converter circuit 68 calculation means

Claims (5)

A concentration measuring device for measuring the concentration of a measurement object contained in a solid sample,
A housing including an insulating member having first and second through holes;
First and second rod-like electrodes extending from the insulating member so that each fits into each of the first and second through holes and is inserted into a solid sample;
Power supply means for supplying power between the first and second electrodes;
Detecting means for detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes;
A temperature sensor supported by the housing for insertion into a solid sample along with the first and second electrodes;
Calculation means for calculating the concentration of the measurement object in the solid sample based on the current value or voltage value detected by the detection means and the temperature of the solid sample measured by the temperature sensor;
Display means for displaying the calculated concentration;
A concentration measuring device comprising: The first and second electrodes have a diameter of 0.5 mm to 2.0 mm;
The length of the portion extending from the housing of the first and second electrodes is 1 mm to 15 mm,
The first and second electrodes are arranged in parallel with each other at an interval of 1 mm to 10 mm;
The concentration measuring apparatus according to claim 1, wherein the temperature sensor is disposed 1 mm to 10 mm apart from the first and second electrodes.   The concentration measuring apparatus according to claim 1, wherein the first and second electrodes are shrink-fitted into the first and second through holes or integrated with the insulating member by insert molding. .   The housing includes a main body housing including the power supply means, detection means, calculation means, and display means, and a probe housing that supports the first and second electrodes and a temperature sensor, and the probe housing includes the main body. The concentration measuring device according to claim 1, wherein the concentration measuring device is detachably connected to the housing. A method for measuring a concentration of a measurement object contained in a solid sample using a concentration measuring device for solid material, the device including a housing including an insulating member having first and second through holes, Is fitted into each of the first and second through holes and extends from the insulating member so as to be inserted into the solid sample, and the first and second electrodes Power supply means for supplying power between the electrodes; detection means for detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes; A temperature sensor supported by the housing so as to be inserted into the solid sample together with the first and second electrodes; a current value or a voltage value detected by the detection means; and a solid sample measured by the temperature sensor. Solid sample based on temperature and Comprising a calculating means for calculating a concentration of the measurement object, wherein the method comprises
Inserting the first and second electrodes and the temperature sensor into the solid sample;
Supplying power between the first and second electrodes;
Detecting at least one of a voltage between the first and second electrodes and a current flowing between the first and second electrodes;
Measuring the temperature of the solid sample;
Calculating the concentration of the measurement object in the solid sample based on the detected current value or voltage value and the measured temperature;
Concentration measuring method including

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