Moisture meter, moisture meter state diagnosis method, and recording medium

Abstract

A moisture meter (100) includes a mass measuring section (2) that measures the mass of a test material, a heating section (3) that heats the test material, a control operation section (5) that controls the heating section (3) to heat until the mass of the test material changes to be below a prescribed threshold value and calculates the moisture rate of the test material based on the change in the mass of the test material before and after heating, and a storage section (8). The control operation section (5) includes a standard substance measuring section (52a) that performs a plurality of moisture rate measurements with a test material that is a standard substance for inspection that exhibits a fixed theoretical moisture rate at an arbitrary mass by heating at a prescribed temperature, a standard deviation calculating section (52c) that calculates the standard deviation of the measured moisture rate in the plurality of measurements, and a state diagnosing section (52d) that compares the measured moisture rate with the theoretical moisture rate of the standard substance stored in the storage section, evaluates whether or not the mass measuring section (2) is abnormal, and evaluates the influence of the setting environment by determining whether or not the standard deviation is below a prescribed value.

Description

TECHNICAL FIELD

[0001] The present application relates to a moisture meter, and more particularly to a heated drying type moisture meter. BACKGROUND

[0002] In the past, as one of devices for measuring moisture of a sample, a heated drying type moisture meter has been known (for example, Patent Literature 1). The heated drying type moisture meter measures the moisture rate of a sample by evaporating the moisture in the sample by heating the sample, based on the change (decrease) in the mass of the sample before and after heating. Hereinafter, in the present specification, the moisture meter refers to the heated drying type moisture meter, unless specifically denied.

[0003] Patent Literature 1 discloses a moisture meter configured to perform calibration using a substance whose moisture rate is previously determined, such as sodium tartrate dihydrate (C4H4Na2O6·2H2O, hereinafter referred to as "sodium tartrate"), as a standard substance for device performance inspection. It is known that sodium tartrate releases moisture by undergoing an irreversible change in crystallization by heating at a temperature of about 160°C for about 10 minutes.

[0004] The moisture meter of Patent Literature 1 compares the actually measured moisture rate of the standard substance with the theoretical moisture rate of the standard substance previously stored in a storage section, and evaluates the state of the moisture meter based on the comparison result according to an evaluation criterion previously set.

[0005] On the other hand, in the field of a measuring device (particularly, an electronic balance), it is known that the measurement value is scattered by so-called disturbances such as a sharp change in temperature due to the operation of an air conditioner, a change in air pressure and humidity due to the passage of a low pressure, and an influence due to the setting environment such as a remote occurrence of an earthquake. Patent Literature 2 discloses a measuring device that enables a user to recognize the state of the device by measuring a known load a plurality of times and calculating the dispersion (standard deviation) of the measurement values.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent Application Publication No. 2003-344255

[0009] Patent Literature 2: Japanese Patent Application Publication No. 2012-154878 SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] However, in the moisture meter of Patent Literature 1, it is not possible to evaluate whether the poor performance of the moisture meter is caused by poor performance of the quality measurement section itself or by an influence (interference) from a factor other than the quality measurement section, i.e., from the setting environment. On the other hand, if a standard deviation of the measurement value is to be used to evaluate the interference, it is necessary to measure a known load multiple times as in Patent Literature 2. For this reason, the moisture meter needs to be provided with an internal weight that can be automatically raised and lowered, and there is a problem in that the structure of the moisture meter becomes complicated.

[0012] The present application has been made in view of this situation, and has an object to provide a heated drying type moisture meter that can diagnose the state of the device taking into account factors other than the quality measurement section itself with a simple structure.

[0013] Means for solving the problem

[0014] To achieve the above object, a moisture meter according to a technical solution of the present application includes: a quality measurement section that measures the mass of a sample placed on a weighing pan; a heating section that heats the sample; a control operation section that controls the heating section to heat until the mass of the sample changes to be below a predetermined threshold value, and calculates the moisture content of the sample based on the change in the mass of the sample before and after heating; and a storage section; the control operation section includes: a standard substance measurement section that performs measurement of the moisture content multiple times using a standard substance for inspection that exhibits a fixed theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample; a standard deviation calculation section that calculates the standard deviation of the measured moisture content in the multiple measurements; and a state diagnosis section that evaluates whether the quality measurement section is abnormal by comparing the measured moisture content with the theoretical moisture content of the standard substance stored in the storage section, and evaluates the influence of the setting environment by determining whether the standard deviation is below a predetermined value.

[0015] Further, in the above technical solution, it is preferable that the control operation section include an average moisture content calculation section that calculates an average moisture content by averaging the measured moisture contents of the multiple measurements; and the state diagnosis section evaluate whether the quality measurement section is abnormal by comparing the average moisture content with the theoretical moisture content.

[0016] Further, in the above technical solution, it is preferable that the standard substance be sodium tartrate dihydrate.

[0017] Further, in the above technical solution, it is preferable that a display section be provided; and the state diagnosis section display, as a diagnosis result, whether the cause of the abnormality is due to the quality measurement section or due to the setting environment in the display section, and display a message that notifies the user of a corresponding solution corresponding to the cause.

[0018] Further, a state diagnosis method of a moisture meter according to another aspect of the present application is a state diagnosis method of a moisture meter provided with a mass measurement unit that measures a mass of a sample placed on a weighing pan, a heating unit that heats the sample, a control operation unit that controls the heating unit to heat until the mass of the sample becomes below a predetermined threshold value and calculates a moisture content of the sample based on a change in the mass of the sample before and after heating, and a storage unit, including: (a) a step in which the control operation unit executes measurement of the moisture content a plurality of times using a standard material that exhibits a fixed theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample; (b) a step in which the control operation unit calculates a standard deviation of the measured moisture content in the plurality of measurements; (c) a step in which the control operation unit compares the measured moisture content with the theoretical moisture content of the standard material stored in the storage unit to evaluate whether the mass measurement unit is abnormal; and (d) a step in which the control operation unit evaluates an influence of a setting environment by determining whether the standard deviation is below a predetermined value.

[0019] Further, a program according to another aspect of the present application is a program for causing the moisture meter to execute the state diagnosis method of the moisture meter.

[0020] Effects of Invention

[0021] In a heating and drying type moisture meter, it is possible to diagnose the state of the device taking into account factors other than the mass measurement unit itself with a simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a block diagram showing the structure of a moisture meter according to an embodiment of the present application.

[0023] Figure 2 is a perspective view of the moisture meter in a state in which a lid of a heating chamber is open.

[0024] Figure 3 is a flowchart of the operation of the moisture meter in a sample measurement mode.

[0025] Figure 4 is a flowchart of the operation of the moisture meter in a check mode.

[0026] Figure 5 is a flowchart of the operation of the moisture meter in a standard material measurement.

[0027] Figure 6 is a diagram showing an example of a display of a result of state diagnosis in the check mode of the moisture meter.

[0028] Figure 7 is a diagram showing an example of a display of a result of state diagnosis in the check mode of the moisture meter. DETAILED DESCRIPTION

[0029] Hereinafter, a preferred embodiment of the present application will be described with reference to the accompanying drawings, but the present application is not limited thereto.

[0030] (Embodiment)

[0031] Figure 1 is a block diagram showing the structure of the moisture meter 100 relating to the embodiment of the present application, Figure 2 is a perspective view showing a state in which the lid 9 of the heating chamber C is opened in the moisture meter 100. As shown in the figure, Figure 1 the moisture meter 100 is provided with a mass measuring section 2, a heating section 3, a control arithmetic section 5, an input section 6, a display section 7, and a storage section 8.

[0032] The mass measuring section 2 is a so-called mass meter such as an electromagnetic balance type mass sensor, and is connected to a weighing dish 2a on which a sample is placed. The mass measuring section 2 measures the mass of the sample placed on the weighing dish 2a. Further, the mass measuring section 2 is housed in the inside of the moisture meter main body 10.

[0033] The weighing dish 2a is arranged in Figure 2 the heating chamber C surrounded by closing the lid 9. The weighing dish 2a is provided with a handle 2b, and is detachably constituted to the mass measuring section 2. The heating chamber C is constituted as a space surrounded by the upper portion of the moisture meter main body 10 and the lid 9, and houses the weighing dish 2a.

[0034] The heating section 3 is provided with a heating mechanism 3a such as a halide lamp or a resistance wire of Joule heating, and a temperature sensor 3b. The heating mechanism 3a is controlled by the control arithmetic section 5 based on the output from the temperature sensor, and heats the sample.

[0035] The heating mechanism 3a is housed in the inside of the lid 9 of the heating chamber C. The lid 9 is provided with a container-shaped glass cover 9a covering the weighing dish 2a in order to prevent the contact of the sample with the heating mechanism 3a.

[0036] The control arithmetic section 5 is a microcomputer provided with a CPU (Central Processing Unit) performing arithmetic processing, a ROM (Read Only Memory), and a RAM (Randam Access Memory).

[0037] The control arithmetic section 5 is connected to each of the mass measuring section 2, the heating section 3, the input section 6, the display section 7, and the storage section 8, and performs various actions for exerting the functions of the moisture meter 100.

[0038] The control arithmetic unit 5 controls each section and executes measurement in a sample measurement mode and a check mode. The sample measurement mode is a normal use mode of the moisture meter 100 and is a mode in which the moisture content M of a sample whose moisture content M is desired to be known is measured. The check mode is a mode in which the state of the moisture meter 100 is checked.

[0039] The control arithmetic unit 5 has a sample measurement section 51 and a check execution section 52. The sample measurement section 51 and the check execution section 52 are realized by a program, for example.

[0040] The sample measurement section 51 executes the sample measurement mode. The sample measurement section 51 controls the heating section 3, monitors the change in the mass of the sample while heating the sample, and stops the heating section 3 at the point in time at which the rate of change in the mass of the sample becomes equal to or less than a predetermined threshold value.

[0041] Further, the sample measurement section 51 calculates the moisture content M of the sample using the mass measurement value before heating and the mass measurement value after heating of the sample by the following Equation 1.

[0042] M (%) = [[(W1 - W2)] / W1] x 100... (Equation 1)

[0043] (Here, W1 is the mass measurement value before heating, and W2 is the mass measurement value after heating.)

[0044] The check execution section 52 executes the check mode. The check execution section 52 has a standard substance measurement section 52a, an average moisture content calculation section 52b, a standard deviation calculation section 52c, and a state diagnosis section 52d.

[0045] The standard substance measurement section 52a measures the moisture content M a plurality of times using a standard substance (hereinafter, simply referred to as "standard substance") for checking as a sample.

[0046] The average moisture content calculation section 52b averages the measured moisture contents of the standard substance obtained by the plurality of measurements by the standard substance measurement section 52a and calculates the average moisture content M AVE .

[0047] The standard deviation calculation section 52c calculates the standard deviation σ of the measured moisture contents of the standard substance obtained by the plurality of measurements by the standard substance measurement section 52a.

[0048] The state diagnosis section 52d determines whether the average moisture content M AVE of the standard substance is within a predetermined range with the theoretical moisture content M T of the standard substance as a reference and diagnoses the presence or absence of an abnormality of the mass measurement section 2.

[0049] Further, the state diagnosis section 52d evaluates the standard deviation σ calculated by the standard deviation calculation section 52c and diagnoses the presence or absence of the influence of the setting environment.

[0050] The input section 6 is an operation button of a start button, a stop button, up and down buttons, a selection button, a decision button, and the like, and performs an instruction of measurement start and measurement stop, a setting of a mode, a selection of an operation, and the like.

[0051] The display section 7 is a liquid crystal display that displays a measurement result, a mode selection screen, a message, and the like. In addition, the input section 6 and the display section 7 can be integrally configured as a touch panel display.

[0052] The storage section 8 is, for example, a nonvolatile semiconductor memory such as a flash memory. In the storage section 8, a setting of a heating temperature capable of performing a correct inspection and a sample placement amount corresponding to a theoretical moisture rate of a standard substance and the standard substance are stored.

[0053] Next, the standard substance used in the state diagnosis of the moisture meter 100 will be described. The standard substance is not limited to these, and for example, the substances shown in Table 1 can be used. In particular, sodium tartrate is preferable because of high stability and easy handling. With respect to these substances, an appropriate heating temperature for performing a theoretical moisture rate M T and a measurement of a moisture rate is known. That is, it is known that by heating at a prescribed temperature, a fixed theoretical moisture rate M T is exhibited at an arbitrary mass.

[0054] [Table 1]

[0055] Examples of the standard substance that can be used

[0056]

[0057]

[0058] The standard substance can be set to at least one, but a plurality of standard substances can be set. In this case, the storage section 8 stores the theoretical moisture rates, the appropriate heating temperatures, and the sample placement amounts of the plurality of standard substances in correspondence with codes assigned to each of the substances.

[0059] Next, the operation of the moisture meter 100 in the sample measurement mode and the inspection mode will be described.

[0060] (Sample Measurement Mode)

[0061] Figure 3 is a flowchart of the operation of the moisture meter 100 in the normal use state, that is, in the sample measurement mode.

[0062] In the case of measuring a sample, in step S101, the user sets the moisture meter 100 to the sample measurement mode from the input section 6. The sample measurement mode can be set in advance as a mode of normal use, and step S101 can be omitted.

[0063] Next, in step S102, the user places the sample on the weighing dish 2a and closes the lid 9, sets the heating temperature from the input section 6, and then presses the measurement start button.

[0064] Next, in step S103, the sample measurement section 51 starts the heating of the heating section 3. By the heating, the moisture of the sample gradually evaporates, and the mass measurement value of the sample measured by the mass measurement section 2 decreases with the passage of time.

[0065] The sample measurement section 51 monitors the change in the mass measurement value, and in step S104, when the change in the mass measurement value becomes below a threshold value set in advance ("Yes" case), the process shifts to step S105. In step S105, the sample measurement section 51 stops the heating of the heating section 3, calculates the moisture rate M according to Equation 1, and displays the calculation result on the display section 7 to end the measurement.

[0066] (Inspection Mode)

[0067] Figure 4 is a flowchart illustrating the operation of the moisture meter 100 in the inspection mode. The inspection mode can be executed at any time when the user of the moisture meter 100 wants to check the presence or absence of an abnormality in the moisture meter 100. In the following description, it is assumed that sodium tartrate is used as the standard substance, and the standard substance is measured N times.

[0068] If the user sets the inspection mode from the input section 6 in step S201, the standard substance measurement section 52a measures the moisture rate N times with the standard substance as the sample in step S202. Here, N can be any natural number of 2 or more. However, from the viewpoint of calculating the standard deviation, N is preferably 3 or more.

[0069] The detailed operation of the measurement of the standard substance in step S202 will be described with reference to Figure 5 The detailed operation of the measurement of the standard substance in step S202 will be described with reference to

[0070] Next, in step S302, the standard substance measurement section 52a sets the sample placement amount and the heating temperature appropriate for the inspection, which are stored in advance in the storage section 8 in correspondence with sodium tartrate, for example, as the following message displayed on the display section 7.

[0071] "Standard substance: Sodium tartrate

[0072] (a) Heating temperature setting 160°C

[0073] (b) Sample mass about 5g"

[0074] Next, in step S303, the user places about 5 g of sodium tartrate on the weighing dish 2a based on the instruction of the display section 7, sets the lid 9 closed after the setting, sets the heating set temperature to 160°C, and starts the measurement.

[0075] The heating temperature can be automatically set to the corresponding heating temperature by the moisture meter 100 according to the kind of the standard substance, in addition to being manually set by the user.

[0076] Next, in step S304, the standard substance measurement section 52a starts the heating of the heating section 3. The standard substance measurement section 52a, like the sample measurement mode, monitors the change in the mass measurement value of the mass measurement section 2.

[0077] Next, in step S305, when the change in the mass measurement value becomes equal to or less than the threshold value set in advance, in step S306, the standard substance measurement section 52a stops the heating of the heating section 3, and calculates the moisture rate M of the standard substance according to Equation 1. The calculation result is temporarily stored in the storage section 8.

[0078] Next, in step S307, the standard substance measurement section 52a determines whether n=N, that is, whether the measurement this time is the Nth measurement.

[0079] In the case where n≠N (in the case of "No"), the standard substance measurement section 52a increments the counter to n=n+1 in step S308, returns to step S302, and repeats steps S302 to S307 until n=N. Next, in step S307, in the case where n=N (in the case of "Yes"), the standard substance measurement section 52a ends the measurement of the standard substance, and the processing shifts to Figure 4 step S203.

[0080] In step S203, the average moisture rate calculation section 52b averages the measured moisture rates of the N times of the standard substance measured in step S202, and calculates the average moisture rate M AVE .

[0081] Next, in step S204, the standard deviation calculation section 52c calculates the standard deviation σ of the measured moisture rates from the measured moisture rates of the N times of the standard substance measured in step S202.

[0082] Next, if the state diagnosis section 52d starts the state diagnosis in step S205, the state diagnosis section 52d determines in step S206 whether the average moisture rate M AVE calculated in step S203 is within a prescribed range with the theoretical moisture rate M T as a reference.

[0083] For example, in the case of using sodium tartrate as in this example, it is determined whether the moisture rate is within the range of 15.0 to 16.0.

[0084] The prescribed range based on the theoretical moisture rate M T is set in accordance with the kind of the standard substance. For example, it can be set to "within ±1% of the theoretical moisture rate M T ".

[0085] In step S206, in the case where the average moisture rate M AVE is within the prescribed range ("Yes"), in step S207, the state diagnosing section 52d determines that there is no abnormality in the quality measuring section 2.

[0086] On the other hand, in step S206, in the case where the average moisture rate M AVE is outside the prescribed range ("No"), in step S208, the state diagnosing section 52d determines that there is an abnormality in the quality measuring section 2.

[0087] Next, in step S209, the state diagnosing section 52d determines whether the standard deviation σ of the N times of the measured moisture rates calculated in step S204 is a prescribed value, for example, 0.05% or less, which is set in advance.

[0088] In step S209, in the case where the standard deviation σ is the prescribed value or less which is set in advance ("Yes"), in step S210, the state diagnosing section 52d determines that there is no problem in the setting environment.

[0089] On the other hand, in step S209, in the case where the standard deviation is larger than the prescribed value which is set in advance ("No"), in step S211, it is determined that there is a problem in the setting environment.

[0090] Next, in step S212, the state diagnosing section 52d displays the diagnosis result on the display section 7 and ends the processing.

[0091] Figure 6 、 Figure 7 Display examples of the diagnosis result displayed on the display section 7. In each display, the button on the image indicated by the black arrow 7a (emphasized in gray in the drawing) is the button in the current selection, and by selecting this button, the display screen transitions.

[0092] Figure 6 (A) of FIG. 21 is an example of the display in the case where it is determined in step S206 that there is an abnormality in the quality measuring section 2 and it is determined in step S209 that there is no problem in the environment. If the user selects "Next" in the state of (A) of FIG. 21, the state diagnosing section 52d displays the display of (B) of FIG. 21. Figure 6 Figure 6 ​(B-1), a message confirming whether or not the correction has been performed is displayed on the display section 7.

[0093] In the case where the correction has not been performed, the user selects "No". Then, the state diagnosing section 52d judges that the correction is needed, and displays a message urging the execution of the correction on the display section 7 as in (B-2) below. Figure 6

[0094] After the execution of the correction, the user confirms whether or not the abnormality has been eliminated by performing the measurement in the check mode again. In the case where the abnormality has not been eliminated even if the correction has been performed, the user selects "Yes" as in (C-1) below. Figure 6

[0095] Then, even if the correction has been performed, the abnormality of the quality measuring section 2 has not been eliminated, and the state diagnosing section 52d judges that the moisture meter 100 needs to be repaired, and displays a message urging the repair as in (C-2) below. Figure 6

[0096] Figure 7 (A) is an example of the display in the case where the quality measuring section 2 is judged to be free from abnormality in step S206, and it is judged that there is a problem in the environment in step S209. If the user selects "Next" in the state of (A) above, the state diagnosing section 52d displays a message urging the confirmation of the setting environment on the display section 7 as in (B) below. Figure 7 Figure 7

[0097] Here, if the user selects "Next", the state diagnosing section 52d displays a message indicating the state of the environment that is likely to cause an influence and the countermeasure for the state as in (C-1) below. Figure 7

[0098] The user selects "End" in the case where the state indicated by the message is considered to be appropriate, and takes the countermeasure indicated by the message. The user selects "No" in the case where the state indicated by the message is considered to be inappropriate, and a message indicating the state that can be considered next and the countermeasure for the state is displayed as in (C-2) below. Figure 7 Figure 7 (C-3) is the same.

[0099] In this way, by displaying the state of the setting environment as the cause and the countermeasure therefor as a message in order, even in the case where the user is not an expert, it is possible to take the necessary measures by following the display only.

[0100] ​​​​​​​In the moisture meter of the related art, in a case where the influence of the disturbance of the moisture meter is to be judged, the following structure is required. For example, the moisture meter is required to have a sensor that directly detects the disturbance, such as a temperature sensor, a humidity sensor, a vibration sensor, an atmospheric pressure sensor, and the like. Alternatively, as in Patent Literature 2, a built-in weight that can be automatically raised and lowered is required to be provided, and the standard deviation of the measured moisture rate is calculated by measuring the built-in weight multiple times.

[0101] The standard substance such as sodium tartrate exhibits a fixed moisture rate at any mass by heating at a prescribed temperature. In the moisture meter 100 relating to the present embodiment, it is configured to use the property to evaluate the influence of the environment by the standard deviation of the measured moisture rate obtained by performing multiple measurements using the standard substance as a sample, as with the standard deviation of the measured value. With the above structure, the moisture meter that can consider the influence of the environment can be provided with a simple structure that does not have an environmental sensor such as a humidity sensor, a vibration sensor, an atmospheric pressure sensor, or a built-in weight.

[0102] Further, in the present embodiment, it is configured to measure the standard substance multiple times, and to diagnose the presence or absence of an abnormality of the mass measurement unit by comparing the average moisture rate obtained by averaging the measured moisture rates of the multiple measurements with the theoretical moisture rate of the standard substance stored in the storage unit, so the presence or absence of an abnormality of the mass measurement unit can be diagnosed using a value that is more accurate than in the related art, and the accuracy of the diagnosis is improved.

[0103] Further, in the moisture meter relating to the present embodiment, it is configured to display on the display unit whether the cause of the abnormality is due to the mass measurement unit or due to the setting environment, and to display a message that notifies the user of a corresponding solution corresponding to the cause. According to the above structure, appropriate handling for the cause of the abnormality can be easily performed even in a case where the user is not an expert, so it is user-friendly.

[0104] The above and preferred embodiments of the present application have been described, but the above embodiments are one example of the present application, and they can be combined based on the knowledge of a person skilled in the art, and such a form is also included in the scope of the present application.

[0105] Explanation of Reference Numerals

[0106] 2: Mass measurement unit

[0107] 2a: Weighing boat

[0108] 3: Heating unit

[0109] 5: Control and calculation unit

[0110] 7: Display unit

[0111] 8: Storage unit

[0112] 52a: standard substance measurement section

[0113] 52b: average moisture rate calculation section

[0114] 52c: standard deviation calculation section

[0115] 52d: state diagnosis section

[0116] 100: moisture meter

Claims

1. A moisture meter characterized by comprising: a mass measuring section that measures a mass of a sample placed on a weighing pan; a heating section that heats the sample; a control operation section that controls the heating section to heat until the mass of the sample changes to be below a predetermined threshold value, and calculates a moisture content of the sample based on a change in the mass of the sample before and after heating; and a storage section; the control operation section comprises: a standard substance measuring section that performs a plurality of measurements of the moisture content with a standard substance for inspection that exhibits a fixed theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample; a standard deviation calculating section that calculates a standard deviation of the measured moisture content in the plurality of measurements; an average moisture content calculating section that calculates an average moisture content by averaging the measured moisture content in the plurality of measurements; and a state diagnosing section that evaluates whether or not there is an abnormality in the mass measuring section by comparing the average moisture content with the theoretical moisture content of the standard substance stored in the storage section, and evaluates an influence of a setting environment by determining whether or not the standard deviation is below a predetermined value.

2. The moisture meter according to claim 1, characterized in that the standard substance is sodium tartrate dihydrate.

3. The moisture meter according to claim 1 or 2, characterized by comprising a display section; the state diagnosing section displays, as a diagnosis result, whether an abnormality is caused by the mass measuring section or the setting environment in the display section, and displays a message that informs a user of a corresponding solution corresponding to the cause.

4. A state diagnosing method of a moisture meter, characterized by being a state diagnosing method of a moisture meter that comprises a mass measuring section that measures a mass of a sample placed on a weighing pan, a heating section that heats the sample, a control operation section that controls the heating section to heat until the mass of the sample changes to be below a predetermined threshold value and calculates a moisture content of the sample based on a change in the mass of the sample before and after heating, and a storage section, the state diagnosing method of the moisture meter comprises: (a) a step in which the control operation section performs a plurality of measurements of the moisture content with a standard substance for inspection that exhibits a fixed theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample; (b) a step in which the control operation section calculates a standard deviation of the measured moisture content in the plurality of measurements, and calculates an average moisture content by averaging the measured moisture content in the plurality of measurements; (c) a step in which the control operation section evaluates whether or not there is an abnormality in the mass measuring section by comparing the average moisture content with the theoretical moisture content of the standard substance stored in the storage section; and (d) a step in which the control operation section evaluates an influence of a setting environment by determining whether or not the standard deviation is below a predetermined value.

5. A recording medium that records a program, characterized in that the program is used to execute the method according to claim 4. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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