WO2021144920A1 - 水分計、水分計の状態診断方法、およびプログラム - Google Patents

水分計、水分計の状態診断方法、およびプログラム Download PDF

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Publication number
WO2021144920A1
WO2021144920A1 PCT/JP2020/001283 JP2020001283W WO2021144920A1 WO 2021144920 A1 WO2021144920 A1 WO 2021144920A1 JP 2020001283 W JP2020001283 W JP 2020001283W WO 2021144920 A1 WO2021144920 A1 WO 2021144920A1
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WIPO (PCT)
Prior art keywords
unit
sample
mass
moisture content
heating
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Ceased
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PCT/JP2020/001283
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English (en)
French (fr)
Japanese (ja)
Inventor
菅野　将弘
吉一 長根
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A&D Holon Holdings Co Ltd
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A&D Co Ltd
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Filing date
Publication date
Application filed by A&D Co Ltd filed Critical A&D Co Ltd
Priority to PCT/JP2020/001283 priority Critical patent/WO2021144920A1/ja
Priority to JP2021570569A priority patent/JP7378195B2/ja
Priority to CN202080072572.4A priority patent/CN114599953B/zh
Priority to US17/792,080 priority patent/US12366511B2/en
Priority to EP20913083.0A priority patent/EP4092401B1/en
Publication of WO2021144920A1 publication Critical patent/WO2021144920A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content

Definitions

  • the present invention relates to a moisture meter, and more particularly to a heat-drying moisture meter.
  • a heat-drying moisture meter is known as one of the devices for measuring the moisture content of a sample (for example, Patent Document 1).
  • the heat-drying moisture meter evaporates the moisture in the sample by heating the sample, and measures the moisture content of the sample from the change (decrease) in the mass of the sample before and after heating.
  • the moisture meter refers to a heat-drying moisture meter.
  • Patent Document 1 sodium tartrate dihydrate (C 4 H 4 Na 2 O 6 ⁇ 2H 2 O, hereinafter, simply referred to as "sodium tartrate.”), Such as, a substance previously moisture content is known, device Disclose a moisture meter configured to be calibrated using as a reference material for performance inspection. It is known that when sodium tartrate is heated at a temperature of about 160 ° C. for about 10 minutes, the crystals undergo irreversible changes and release water.
  • the moisture meter of Patent Document 1 compares the measured moisture content of the standard substance with the theoretical moisture content of the standard substance stored in advance in the storage unit, and evaluates the state of the moisture meter according to a predetermined evaluation standard. do.
  • Patent Document 2 discloses a measuring device that measures a known load a plurality of times, calculates a variation (standard deviation) of the measured values, and makes the state of the device recognizable to the user.
  • Patent Document 1 cannot evaluate whether the performance defect of the moisture meter is due to the performance defect of the mass measuring unit itself or other factors, that is, the influence (disturbance) due to the installation environment. rice field.
  • the moisture meter of Patent Document 1 in order to use the standard deviation of the measured values to evaluate the disturbance, it is necessary to measure the known load a plurality of times as in Patent Document 2. For that purpose, it is necessary to equip the moisture meter with a built-in weight that can be automatically raised and lowered, and there is a problem that the configuration of the moisture meter becomes complicated.
  • the present invention has been made in view of such circumstances, and provides a heat-drying moisture meter capable of diagnosing the state of an apparatus with a simple configuration and in consideration of factors other than the mass measuring unit itself. With the goal.
  • the moisture meter includes a mass measuring unit for measuring the mass of a sample placed on a weighing dish, a heating unit for heating the sample, and the heating unit.
  • a control calculation unit and a storage unit for calculating the water content of the sample from the mass change of the sample before and after heating by heating until the mass change of the sample becomes equal to or less than a predetermined threshold value are provided.
  • the control calculation unit uses a standard material for inspection that shows a constant theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample, and a standard material measurement unit that measures the moisture content multiple times, and an actual measurement.
  • An abnormality of the mass measurement unit by comparing the standard deviation calculation unit that calculates the standard deviation in the plurality of measurements of the water content and the measured water content with the theoretical water content of the standard substance stored in the storage unit. It is provided with a state diagnosis unit that evaluates the presence or absence of the sample, determines whether the standard deviation is equal to or less than a predetermined value, and evaluates the influence of the installation environment.
  • control calculation unit includes an average moisture content calculation unit that calculates the average moisture content by averaging the measured moisture content in the plurality of measurements, and the state diagnosis unit calculates the average moisture content. It is also preferable to evaluate the presence or absence of abnormality in the mass measuring unit in comparison with the theoretical water content.
  • the standard substance is sodium tartrate dihydrate.
  • the display unit is provided, and the state diagnosis unit displays as a diagnosis result whether the cause of the abnormality is due to the mass measurement unit or the installation environment, and responds to the cause. It is also preferable to display a message informing the user of the countermeasure on the display unit.
  • the mass measuring unit for measuring the mass of the sample placed on the weighing dish, the heating unit for heating the sample, and the heating unit are controlled.
  • a moisture meter including a control calculation unit and a storage unit that heats the sample until the mass change of the sample becomes equal to or less than a predetermined threshold value and calculates the moisture content of the sample from the mass change of the sample before and after heating.
  • a state diagnosis method wherein (a) the control calculation unit uses a standard substance for inspection that shows a constant theoretical moisture content at an arbitrary mass by heating at a predetermined temperature as the sample, and measures the moisture content.
  • the control calculation unit calculates the standard deviation of the measured water content in the plurality of measurements, and (c) the control calculation unit calculates the measured water content.
  • the program according to another aspect of the present invention is a program for causing the moisture meter to execute the state diagnosis method of the moisture meter.
  • the heat-drying moisture meter has a simple configuration, and it is possible to diagnose the state of the device in consideration of factors other than the mass measuring unit itself.
  • FIG. 1 is a block diagram showing the configuration of the moisture meter 100 according to the embodiment of the present invention
  • FIG. 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.
  • the moisture meter 100 includes a mass measuring unit 2, a heating unit 3, a control calculation unit 5, an input unit 6, a display unit 7, and a storage unit 8.
  • the mass measuring unit 2 is a so-called mass meter such as an electromagnetic equilibrium type mass sensor, and is connected to a weighing pan 2a on which a sample is placed.
  • the mass measuring unit 2 measures the mass of the sample placed on the weighing pan 2a. Further, the mass measuring unit 2 is housed inside the moisture meter main body 10.
  • the weighing pan 2a is arranged in the heating chamber C defined by closing the opening / closing lid 9 shown in FIG.
  • the weighing pan 2a is provided with a handle 2b and is configured to be removable from the mass measuring unit 2.
  • the heating chamber C is configured as a space defined by the upper part of the moisture meter main body 10 and the lid 9, and stores the weighing pan 2a.
  • the heating unit 3 includes a heating means 3a such as a halogen lamp and a resistance wire that generates heat in Joule, and a temperature sensor 3b.
  • the heating means 3a is controlled by the control calculation unit 5 based on the output from the temperature sensor to heat the sample.
  • the heating means 3a is stored inside the lid 9 of the heating chamber C.
  • the lid 9 includes a container-shaped glass cover 9a that covers the weighing pan 2a in order to prevent contact between the sample and the heating means 3a.
  • the control calculation unit 5 is a microcomputer including a CPU (Central Processing Unit) that performs arithmetic processing, a ROM (Read / Only / Memory) and a RAM (Random / Access / Memory) as auxiliary storage units.
  • a CPU Central Processing Unit
  • ROM Read / Only / Memory
  • RAM Random / Access / Memory
  • the control calculation unit 5 is connected to each unit of the mass measurement unit 2, the heating unit 3, the input unit 6, the display unit 7, and the storage unit 8, and executes various operations for exerting the functions of the moisture meter 100. do.
  • the control calculation unit 5 controls each unit to execute the measurement in the sample measurement mode and the inspection mode.
  • the sample measurement mode is a normal use mode of the moisture meter 100, and is a mode for measuring the moisture content M of a sample for which the moisture content M is desired to be known.
  • the inspection mode is a mode for inspecting the state of the moisture meter 100.
  • the control calculation unit 5 includes a sample measurement unit 51 and an inspection execution unit 52.
  • the sample measurement unit 51 and the inspection execution unit 52 are realized by, for example, a program.
  • the sample measurement unit 51 executes the sample measurement mode.
  • the sample measuring unit 51 controls the heating unit 3 to monitor the mass change of the sample while heating the sample, and stops the heating unit 3 when the mass change rate of the sample becomes equal to or less than a predetermined threshold value. Let me.
  • the sample measuring unit 51 calculates the moisture content M of the sample by the following formula 1 using the mass measurement value before heating and the mass measurement value after heating of the sample.
  • M (%) [[(W1-W2)] / W1] ⁇ 100 ... (Equation 1) (Here, W1 is the mass measurement value before heating, and W2 is the mass measurement value after heating.)
  • the inspection execution unit 52 executes the inspection mode.
  • the inspection execution unit 52 includes a standard substance measurement unit 52a, an average moisture content calculation unit 52b, a standard deviation calculation unit 52c, and a state diagnosis unit 52d.
  • the standard substance measuring unit 52a measures the water content M a plurality of times using a standard substance for inspection (hereinafter, simply referred to as "standard substance”) as a sample.
  • standard substance a standard substance for inspection
  • the average moisture content calculator 52b on average a plurality of times actual moisture content of the standard substance obtained by measurement of the standard measuring unit 52a, to calculate an average moisture content M AVE.
  • the standard deviation calculation unit 52c calculates the standard deviation ⁇ of the measured moisture content of the standard substance obtained by the multiple measurements of the standard substance measurement unit 52a.
  • Condition diagnosis unit 52d has an average moisture content M AVE of reference materials, it is determined whether or not it is within a predetermined range relative to the theoretical moisture content M T of the standard, whether the mass of the measurement section 2 abnormality To diagnose.
  • the state diagnosis unit 52d evaluates the standard deviation ⁇ calculated by the standard deviation calculation unit 52c to diagnose the presence or absence of the influence of the installation environment.
  • the input unit 6 is an operation button such as a start button, a stop button, an up / down button, a selection button, and a decision button, and performs measurement start, measurement stop instruction, mode setting, operation selection, and the like.
  • the display unit 7 is a liquid crystal display and displays measurement results, a mode selection screen, a message, and the like.
  • the input unit 6 and the display unit 7 may be integrally configured as a touch panel display.
  • the storage unit 8 is, for example, a non-volatile semiconductor memory such as a flash memory.
  • the storage unit 8 stores the setting of the heating temperature and the amount of the sample placed so that an appropriate inspection can be performed according to the theoretical moisture content of the standard substance and the standard substance.
  • the reference substance is not limited to these, and for example, the substances shown in Table 1 can be used.
  • sodium tartrate is suitable because it has high stability and is easy to handle.
  • suitable heating temperature for the measurement of the theoretical moisture content M T and the moisture content is known. That is, it is known to exhibit certain theoretical moisture content M T in any mass by heating at a predetermined temperature.
  • At least one standard substance may be set, but a plurality of standard substances may be set.
  • the storage unit 8 stores the theoretical moisture content of the plurality of standard substances, the appropriate heating temperature, and the sample loading amount corresponding to the codes assigned to the individual substances.
  • FIG. 3 is a flowchart of the normal use state of the moisture meter 100, that is, the operation of the moisture meter 100 in the sample measurement mode.
  • step S101 the user sets the moisture meter 100 to the sample measurement mode from the input unit 6.
  • the sample measurement mode may be set in advance as the mode normally used, and step S101 may be omitted.
  • step S102 the user places the sample on the weighing pan 2a, closes the lid 9, sets the heating temperature from the input unit 6, and then presses the measurement start button.
  • step S103 the sample measuring unit 51 starts heating the heating unit 3.
  • the water content of the sample gradually evaporates due to heating, and the mass measurement value of the sample measured by the mass measuring unit 2 decreases with the passage of time.
  • the sample measurement unit 51 monitors the change in the mass measurement value, and when the change in the mass measurement value becomes equal to or less than a predetermined threshold value in step S104 (in the case of Yes), the sample measurement unit 51 shifts to step S105. .. In step S105, the sample measuring unit 51 stops heating of the heating unit 3, calculates the moisture content M according to Equation 1, displays the calculated result on the display unit 7, and ends the measurement.
  • FIG. 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 inspect for the presence or absence of an abnormality in the moisture meter 100.
  • sodium tartrate is used as a standard substance and the standard substance is measured N times.
  • step S201 the user sets the inspection mode from the input unit 6, and in step S202, the standard substance measuring unit 52a measures the water content N times using the standard substance as a sample.
  • N may be a natural number of 2 or more. However, it is preferable that N is 3 or more from the viewpoint of calculating the standard deviation.
  • step S302 the standard substance measuring unit 52a sets the sample placement amount and the heating temperature suitable for the inspection, which are stored in the storage unit 8 in advance corresponding to the sodium tartrate, to the display unit 7, for example, as follows. Display as a message like. "Standard substance: sodium tartrate (a) Heating temperature setting 160 ° C (B) Sample mass about 5 g "
  • step S303 the user places about 5 g of sodium tartrate on the weighing pan 2a based on the instruction of the display unit 7, closes the lid 9 and sets the temperature, and then sets the heating set temperature to 160 ° C. And start the measurement.
  • the heating temperature may be set manually by the user, or may be automatically set by the moisture meter 100 according to the type of standard substance.
  • step S304 the standard substance measuring unit 52a starts heating the heating unit 3.
  • the standard substance measurement unit 52a monitors the change in the mass measurement value of the mass measurement unit 2 in the same manner as in the sample measurement mode.
  • step S305 when the change in the mass measurement value becomes equal to or less than a predetermined threshold value, in step S306, the standard substance measuring unit 52a stops heating the heating unit 3, and the moisture content M of the standard substance M. Is calculated according to Equation 1. The calculation result is temporarily stored in the storage unit 8.
  • step S203 the average moisture content calculation unit 52b averages the measured moisture content of the standard substance for N times measured in step S202 to calculate the average moisture content MAVE.
  • step S204 the standard deviation calculation unit 52c calculates the standard deviation ⁇ of the measured moisture content from the measured moisture content of the standard substance for N times measured in step S202.
  • step S205 the state diagnostic unit 52d starts condition diagnosis, condition diagnosis unit 52d in step S206, a predetermined average moisture content M AVE is, relative to the theoretical moisture content M T calculated in step S203 Judge whether it is within the range of.
  • sodium tartrate when sodium tartrate is used as in this example, it is determined whether or not the water content is in the range of 15.0 to 16.0.
  • Predetermined range based on the theoretical moisture content M T is determined according to the type of standard. For example, such as “theory moisture content M T ⁇ 1% within”, it may be set.
  • step S206 when the average moisture content MAVE is within the predetermined range (Yes), in step S207, the state diagnosis unit 52d determines that there is no abnormality in the mass measurement unit 2.
  • step S208 when the average moisture content MAVE is out of the predetermined range (No), in step S208, the state diagnosis unit 52d determines that the mass measurement unit 2 has an abnormality.
  • step S209 the state diagnosis unit 52d determines whether or not the standard deviation ⁇ of the measured water content for N times calculated in step S204 is a preset predetermined value, for example, 0.05% or less. do.
  • step S209 If the standard deviation ⁇ is equal to or less than a preset predetermined value in step S209 (Yes), the state diagnosis unit 52d determines that there is no problem in the installation environment in step S210.
  • step S211 determines whether there is a problem in the installation environment.
  • step S212 the state diagnosis unit 52d displays the diagnosis result on the display unit 7 and ends the process.
  • buttons 6 and 7 show a display example of the diagnosis result displayed on the display unit 7.
  • the button on the image pointed to by the black arrowhead 7a (highlighted in gray in the figure) is the currently selected button, and by selecting this button, the display screen changes.
  • FIG. 6A is an example of display when the mass measuring unit 2 has an abnormality in step S206 and it is determined in step S209 that there is no problem in the environment.
  • the state diagnosis unit 52d confirms whether or not the display unit 7 has been calibrated as shown in FIG. 6 (B-1). Is displayed.
  • the state diagnosis unit 52d determines that calibration is necessary, and displays a message prompting the execution of calibration on the display unit 7 as shown in FIG. 6 (B-2).
  • the user After executing the calibration, the user confirms whether the abnormality has been resolved by executing the measurement in the inspection mode again. If the abnormality is not resolved even after calibration, the user selects "Yes” as shown in FIG. 6 (C-1).
  • the state diagnosis unit 52d determines that the abnormality of the mass measurement unit 2 is not resolved even after the calibration, and the moisture meter 100 is in a state requiring repair, as shown in FIG. 6 (C-2). Displays a message prompting for repair. The user requests repair according to the message.
  • FIG. 7A is an example of display when it is determined in step S206 that the mass measuring unit 2 has no abnormality and in step S209 that there is a problem with the environment.
  • the state diagnosis unit 52d displays a message prompting confirmation of the installation environment on the display unit 7 as shown in FIG. 7B.
  • the state diagnosis unit 52d displays a message indicating the state of the environment that may affect the state and the countermeasures for the state, as shown in FIG. 7 (C-1). do.
  • the following configuration was required when trying to judge the influence of disturbance on the defective moisture meter.
  • a sensor that directly detects disturbance such as a temperature sensor, a humidity sensor, a vibration sensor, and an atmospheric pressure sensor.
  • a built-in weight that can be automatically raised and lowered, measure the built-in weight a plurality of times, and calculate the standard deviation of the measured moisture content.
  • Standard substances such as sodium tartrate show a constant moisture content with an arbitrary mass when heated at a predetermined temperature.
  • the standard deviation of the measured value is used by using the standard deviation of the measured moisture content obtained by performing a plurality of measurements using the standard substance as a sample. It was configured to evaluate the impact of the environment in the same way as. With the above configuration, it is possible to provide a moisture meter that can consider the influence of the environment with a simple configuration that does not include an environmental sensor such as a humidity sensor, a vibration sensor, or an atmospheric pressure sensor, or a built-in weight.
  • the standard substance is measured a plurality of times, and the average moisture content obtained by averaging the measured moisture content in the multiple measurements is used and compared with the theoretical moisture content of the standard substance stored in the storage unit. Since it is configured to diagnose the presence or absence of an abnormality in the mass measuring unit, it is possible to diagnose the presence or absence of an abnormality in the mass measuring unit using a value having a higher accuracy than before, and the accuracy of the diagnosis is improved. ..
  • the display unit displays whether the cause of the abnormality is due to the mass measurement unit or the installation environment, and the user is provided with countermeasures according to the cause. It is configured to display a notification message. According to the above configuration, even if the user is not an expert, appropriate measures can be easily taken for the cause of the abnormality, and thus the user is friendly.

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PCT/JP2020/001283 2020-01-16 2020-01-16 水分計、水分計の状態診断方法、およびプログラム Ceased WO2021144920A1 (ja)

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PCT/JP2020/001283 WO2021144920A1 (ja) 2020-01-16 2020-01-16 水分計、水分計の状態診断方法、およびプログラム
JP2021570569A JP7378195B2 (ja) 2020-01-16 2020-01-16 水分計、水分計の状態診断方法、およびプログラム
CN202080072572.4A CN114599953B (zh) 2020-01-16 2020-01-16 水分计、水分计的状态诊断方法及记录介质
US17/792,080 US12366511B2 (en) 2020-01-16 2020-01-16 Moisture meter, state diagnosis method for moisture meter, and storage medium
EP20913083.0A EP4092401B1 (en) 2020-01-16 2020-01-16 Moisture meter, state diagnosis method for moisture meter, and program

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JPWO2021144920A1 (https=) 2021-07-22
EP4092401B1 (en) 2025-07-30
US12366511B2 (en) 2025-07-22
EP4092401A1 (en) 2022-11-23
EP4092401A4 (en) 2023-08-02

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