Quantity measuring device, calibration program and calibration method

Abstract

The present invention relates to a quantity measuring device, a calibration program, and a calibration method that can reduce the frequency of manual calibration. [Solution] The system comprises a first sensor capable of measuring a first quantity value of the object to be measured, a second sensor capable of measuring the first quantity value of the object to be measured or a second quantity value correlated with the first quantity value, and a calibration unit that calibrates the first sensor using the measurement values ​​of the first sensor and the second sensor, wherein the first sensor is arranged to be located on a first path along which the object to be measured flows, and the second sensor is arranged in a measurement environment where it is less susceptible to deterioration than the first sensor.

Description

[Technical field]

[0001] The present invention relates to a quantity measuring device, a calibration program, and a calibration method. [Background technology]

[0002] A liquid residual chlorine concentration meter capable of measuring the residual chlorine concentration in a liquid has been known for some time (Patent Document 1, etc.). The liquid residual chlorine concentration meter described in Patent Document 1 measures the residual chlorine concentration in a sample of water using the voltage generated between a working electrode and a reference electrode when the two electrodes are immersed in the sample of water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-090986 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the liquid residual chlorine concentration meter described in Patent Document 1 has the problem that measurement errors can occur because the liquid to be measured is different each time and because the electrodes wear out during measurement, and so the user must manually calibrate the device according to the calibration method described in the product's instruction manual or the like every time they attempt to measure the residual chlorine concentration.

[0005] The present invention relates to an object quantity measuring device, a calibration program, and a calibration method that can reduce the frequency of manual calibration. [Means for solving the problem]

[0006] The quantity measuring device of the present invention comprises a first sensor capable of measuring a first quantity value of an object to be measured, a second sensor capable of measuring the first quantity value of the object to be measured or a second quantity value correlated with the first quantity value, and a calibration unit that calibrates the first sensor using the measurement values ​​of the first sensor and the measurement values ​​of the second sensor, wherein the first sensor is arranged to be located on a first path along which the object to be measured flows, and the second sensor is arranged in a measurement environment in which it is less susceptible to deterioration than the first sensor.

[0007] In the quantity measuring device of the present invention, the second sensor is arranged to be located on a second path along which the object to be measured flows, the second sensor is configured to be switchable between a measurement state and a non-measurement state, and the measurement interval for the second sensor may be configured to be longer than the measurement interval for the first sensor.

[0008] In the quantity measuring device of the present invention, the second sensor is arranged to be located on a second path along which the object to be measured flows, and a cross-sectional area of ​​the space in which the second sensor is arranged may be larger than a cross-sectional area of ​​the space in which the first sensor is arranged.

[0009] In the quantity measuring device of the present invention, the second sensor is arranged to be located on a second path along which the object to be measured flows, and a switching unit may be provided between the first path and the second path, capable of switching between a flow state in which the object to be measured flows along the second path and a non-flow state in which the object to be measured does not flow along the second path.

[0010] The quantity measuring device according to the present invention may include a first flow cell capable of accommodating the first sensor, and a second flow cell capable of accommodating the second sensor.

[0011] In the quantity measuring device according to the present invention, the first sensor and the second sensor each have a working electrode and a reference electrode, and the working electrode may be a silver / silver chloride electrode.

[0012] The calibration program of the present invention is a calibration program that causes a quantity measuring device having a first sensor capable of measuring a first quantity value of an object to be measured and a second sensor capable of measuring the first quantity value of the object to be measured or a second quantity value correlated with the first quantity value, to execute a calibration process to calibrate the first sensor, and causes the quantity measuring device to execute a first measurement process to measure the first quantity value of the object to be measured using the first sensor arranged on a first path along which the object to be measured flows, a second measurement process to measure the first quantity value or the second quantity value of the object to be measured using the second sensor arranged in a measurement environment less susceptible to deterioration than the first sensor, and a calibration process to calibrate the first sensor using the measurement values ​​of the first sensor and the measurement values ​​of the second sensor.

[0013] A calibration method according to the present invention is a calibration method for calibrating a first sensor using a first sensor capable of measuring a first quantity value of an object to be measured and a second sensor capable of measuring the first quantity value of the object to be measured or a second quantity value correlated with the first quantity value, and includes a first measurement step of placing the first sensor on a first path along which the object to be measured flows and measuring the first quantity value of the object to be measured using the first sensor, a second measurement step of placing the second sensor in a measurement environment less susceptible to deterioration than the first sensor and measuring the first quantity value or the second quantity value of the object to be measured using the second sensor, and a calibration step of calibrating the first sensor using the measurement values ​​of the first sensor and the second sensor. Effect of the Invention

[0014] According to the quantity measuring device, the calibration program, and the calibration method of the present invention, it is possible to reduce the frequency of manual calibration. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing a quantity measuring device according to an embodiment of the present invention. [Diagram 2]2 is a schematic diagram showing a first measuring member and a second measuring member according to the present embodiment. FIG. [Diagram 3] FIG. 1 is a schematic diagram showing an example of a measurement environment that is less susceptible to deterioration. [Figure 4] FIG. 13 is a diagram showing a process for correcting a calibration curve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In addition, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0017] [Overall configuration of quantity measuring device] As shown in FIG. 1, the quantity measuring device 1 includes a first measuring member 100 and a second measuring member 200 capable of measuring a first quantity value of a liquid to be measured (a measuring object), and a device body 300 connected to the first measuring member 100 and the second measuring member 200. The first measuring member 100 and the device body 300 are electrically connected via a first wiring W1. The second measuring member 200 and the device body 300 are electrically connected via a second wiring W2. The first wiring W1 and the second wiring W2 may be connected wirelessly. The quantity measuring device 1 may have a third measuring member in addition to the first measuring member 100 and the second measuring member 200, and the third measuring member may be used as a spare measuring member.

[0018] [Configuration of the first measuring member] 2, the first measurement member 100 includes a first rod member 110 attached to the tip of the first wiring W1, a first sensor 120 attached to the tip of the first rod member 110, and a first flow cell 130 capable of accommodating the first rod member 110 and the first sensor 120. Note that the first rod member 110 is not an essential component of the first measurement member 100, and other components may be used as long as the first sensor 120 can be positioned on a first route R1 described below.

[0019] The first sensor 120 is an electrode attached to the tip of the first rod member 110, and has a first working electrode 121 and a first reference electrode 122. The first working electrode 121 and the first reference electrode 122 are electrically connected to the device body 300 via a first wiring W1 attached to the first rod member 110. For example, a silver / silver chloride electrode can be used as the first working electrode 121. Furthermore, for example, a platinum electrode can be used as the first reference electrode 122.

[0020] The first sensor 120 is configured to be able to measure a first quantity value of the liquid to be measured. Specifically, the first sensor 120 is provided so as to be located on a first path R1 through which the liquid to be measured flows, and is configured to measure a voltage value corresponding to the residual chlorine concentration of the liquid to be measured as the first quantity value. The first path R1 will be described later.

[0021] The first sensor 120 may have a counter electrode in addition to the first working electrode 121 and the first reference electrode 122. The first sensor 120 may be another sensor instead of an electrode.

[0022] The first flow cell 130 has a first accommodating section 131 capable of accommodating the first rod member 110 and the first sensor 120, a first upstream connection section 132 capable of being connected to a first flow path F1 provided upstream of the first measuring member 100, and a first downstream connection section 133 capable of being connected to a second flow path F2 provided downstream of the first measuring member 100.

[0023] The first housing portion 131 is formed in a long cylindrical shape having a first housing space 131a capable of housing the first bar member 110 and the first sensor 120. A first insertion opening 131b for passing the first wiring W1 is formed at the upper end of the first housing portion 131. Note that the first housing portion 131 only needs to be configured to be capable of housing at least the first sensor 120, and when a configuration replacing the first bar member 110 is adopted, the first housing portion 131 may have a shape corresponding to the shape of the adopted configuration.

[0024] The first upstream connection part 132 is formed in a cylindrical shape having a first upstream flow space 132a capable of flowing the liquid to be measured, and is formed to extend from the vicinity of the closed end (the other end in the longitudinal direction) of the first storage part 131 toward the outside in the lateral direction of the first storage part 131. A first inlet 132b is formed at the tip part of the first upstream connection part 132 for allowing the liquid to be measured to flow into the first upstream flow space 132a. At the base end part of the first upstream connection part 132, the first upstream flow space 132a communicates with the first storage space 131a.

[0025] The first downstream connection part 133 is formed in a cylindrical shape having a first downstream flow space 133a capable of flowing the liquid to be measured, and is formed to extend from the longitudinal center of the first storage part 131 toward the outside in the lateral direction of the first storage part 131. A first outlet 133b is formed at the tip of the first downstream connection part 133 for allowing the liquid to be measured to flow out of the first downstream flow space 133a. At the base end of the first downstream connection part 133, the first downstream flow space 133a communicates with the first storage space 131a.

[0026] From the viewpoint of allowing air bubbles on the first path R1 to escape and improving the measurement accuracy of the first sensor 120, it is preferable that the first downstream connection part 133 be located at a higher position than the first upstream connection part 132, but this is not limited to this.

[0027] In the first flow cell 130 having the above configuration, the liquid to be measured flows in from the first inlet 132b, flows through the first upstream flow space 132a, the first storage space 131a, and the first downstream flow space 133a, and then flows out from the first outlet 133b (see the arrows in FIG. 2). That is, in the first flow cell 130 according to this embodiment, the first upstream flow space 132a, the first storage space 131a, and the first downstream flow space 133a form a first route R1 through which the liquid to be measured flows.

[0028] The first flow cell 130 is configured to position the first sensor 120 on the first path R1 by accommodating the first sensor 120 in the first accommodating space 131a.

[0029] [Configuration of the second measuring member] As shown in FIG. 2, the second measuring member 200 is provided downstream of the first measuring member 100. The second measuring member 200 basically has the same configuration as the first measuring member 100. Specifically, as shown in FIG. 2, the second measuring member 200 includes a second rod member 210 attached to the tip of the second wiring W2, a second sensor 220 attached to the tip of the second rod member 210, and a second flow cell 230 capable of accommodating the second rod member 210 and the second sensor 220. In the second measuring member 200, the second rod member 210 is not an essential component, and other configurations may be adopted as long as the second sensor 220 can be positioned on the second route R2 described later.

[0030] The second sensor 220 is an electrode attached to the tip of the second rod member 210, and has a second working electrode 221 and a second reference electrode 222. The second working electrode 221 and the second reference electrode 222 are electrically connected to the device body 300 via a second wiring W2 attached to the second rod member 210. As the second working electrode 221, for example, a silver / silver chloride electrode can be used. Also, as the second reference electrode 222, for example, a platinum electrode can be used.

[0031] The second sensor 220 is configured to be able to measure a first quantity value of the liquid to be measured. Specifically, the second sensor 220 is provided so as to be located on a second path R2 through which the liquid to be measured flows, and is configured to measure a voltage value corresponding to the residual chlorine concentration of the liquid to be measured as the first quantity value. The second path R2 will be described later.

[0032] The second sensor 220 may have a counter electrode in addition to the second working electrode 221 and the second reference electrode 222. The second sensor 220 may be another sensor instead of an electrode.

[0033] The second flow cell 230 has a second accommodating section 231 capable of accommodating the second rod member 210 and the second sensor 220, a second upstream connection section 232 capable of being connected to a second flow path F2 provided upstream of the second measuring member 200, and a second downstream connection section 233 capable of being connected to a third flow path F3 provided downstream of the second measuring member 200.

[0034] The second housing portion 231 is formed in a long cylindrical shape having a second housing space 231a capable of housing the second bar member 210 and the second sensor 220. A second insertion opening 231b for passing the second wiring W2 is formed at the upper end of the second housing portion 231. Note that the second housing portion 231 only needs to be configured to be capable of housing at least the second sensor 220, and when a configuration replacing the second bar member 210 is adopted, the second housing portion 231 may have a shape corresponding to the shape of the adopted configuration.

[0035] The second upstream connection part 232 is formed in a cylindrical shape having a second upstream flow space 232a capable of flowing the liquid to be measured, and is formed to extend from the vicinity of the closed end (the other end in the longitudinal direction) of the second storage part 231 toward the outside in the lateral direction of the second storage part 231. A second inlet 232b is formed at the tip of the second upstream connection part 232 for allowing the liquid to be measured to flow into the second upstream flow space 232a. At the base end of the second upstream connection part 232, the second upstream flow space 232a communicates with the second storage space 231a.

[0036] The second downstream connection part 233 is formed in a cylindrical shape having a second downstream flow space 233a through which the liquid to be measured can flow, and is formed to extend from the longitudinal center of the second storage part 231 toward the outside in the lateral direction of the second storage part 231. A second outlet 233b is formed at the tip of the second downstream connection part 233 for allowing the liquid to be measured to flow out of the second downstream flow space 233a. At the base end of the second downstream connection part 233, the second downstream flow space 233a communicates with the second storage space 231a.

[0037] From the viewpoint of allowing air bubbles on the second path R2 to escape and improving the measurement accuracy of the second sensor 220, it is preferable that the second downstream connection part 233 be provided at a higher position than the second upstream connection part 232, but this is not limited to this.

[0038] In the second flow cell 230 having the above configuration, the liquid to be measured flows in from the second inlet 232b, flows through the second upstream flow space 232a, the second accommodation space 231a, and the second downstream flow space 233a, and then flows out from the second outlet 233b (see the arrows in FIG. 2). That is, in the second flow cell 230 according to this embodiment, the second upstream flow space 232a, the second accommodation space 231a, and the second downstream flow space 233a form a second route R2 through which the liquid to be measured flows.

[0039] The second flow cell 230 is configured to position the second sensor 220 on the second path R2 by accommodating the second sensor 220 in the second accommodation space 231a.

[0040] <Second sensor placement> In this embodiment, the second sensor 220 is placed in a measurement environment that is less prone to deterioration than the first sensor 120. Examples of measurement environments that are less prone to deterioration are given below, but the present invention is not limited to these. In this specification, the term "deterioration" includes, for example, deterioration due to dirt, scratches, and wear, as well as deterioration due to aging.

[0041] An example of a measurement environment that is less likely to deteriorate is an environment in which the second sensor 220 is configured to be switchable between a measurement state and a non-measurement state, and the measurement interval for the second sensor 220 is configured to be longer than the measurement interval for the first sensor 120. In the non-measurement state, no oxidation-reduction reaction occurs due to contact with the liquid to be measured, and the second sensor 220 is less likely to deteriorate than the first sensor 120 because the second sensor 220 is in the non-measurement state for a longer period of time than the first sensor 120. As a method for switching the second sensor 220 to the measurement state or the non-measurement state, for example, a method of turning on / off the electrical connection between the second sensor 220 and the device main body 300 can be mentioned. The switching to the measurement state or the non-measurement state may be performed automatically or manually at a predetermined timing or an arbitrary timing. The predetermined timing may be a timing specified in advance, or may be a timing derived using a trained model. Machine learning may be continued without using a trained model.

[0042] Another example of a measurement environment that is less susceptible to deterioration is an environment in which the cross-sectional area of ​​the space in which the second sensor 220 is disposed is larger than the cross-sectional area of ​​the space in which the first sensor 120 is disposed. In this case, the flow rate of the measurement target liquid flowing through the space in which the second sensor 220 is disposed is slower than that of the measurement target liquid flowing through the space in which the first sensor 120 is disposed. In other words, the amount of chlorine that contacts the second sensor 220 is less than the amount of chlorine that contacts the first sensor 120, so the second sensor 220 is less susceptible to deterioration than the first sensor 120.

[0043] Another example of a measurement environment that is less likely to deteriorate is an environment in which a switching unit 400 capable of switching between a flowing state in which the measurement target liquid flows through the second path R2 and a non-flowing state in which the measurement target liquid does not flow through the second path R2 is provided between the first path R1 and the second path R2, as shown in Fig. 3. Specifically, this is an environment in which the second flow path F2 is composed of a second flow path F2a connected to the first downstream connection part 133 and a second flow path F2b branched from the second flow path F2a and connected to the second upstream connection part 232, and the switching unit 400 is provided at the branch point of the second flow path F2a and the second flow path F2b. In this case, the second sensor 220 can be in a flowing state only when the measurement is performed by the second sensor 220, and in a non-flowing state when the measurement is not performed by the second sensor 220. Since the measurement interval for the second sensor 220 can be made longer than the measurement interval for the first sensor 120, the second sensor 220 is less likely to deteriorate than the first sensor 120. For example, a known valve can be used as the switching unit 400. Note that the switching by the switching unit 400 may be performed automatically or manually at a predetermined timing or an arbitrary timing. In addition, the predetermined timing may be a timing specified in advance, or may be a timing derived using a trained model. Machine learning may be continued without using a trained model.

[0044] Yet another example of a measurement environment that is less susceptible to deterioration is an environment in which the liquid to be measured flowing into the second inlet 232b is diluted by mixing with water. In this case, the residual chlorine concentration of the liquid to be measured flowing through the second path R2 is lower than that of the liquid to be measured flowing through the first path R1, so the second sensor 220 is less susceptible to deterioration than the first sensor 120.

[0045] The measurement environment that is less likely to deteriorate may be any one of the measurement environments exemplified above, or may be a combination of two or more of the measurement environments exemplified above.

[0046] [Device configuration] As shown in FIG. 1, the device main body 300 includes a control unit 310 having at least a CPU, a storage unit 320 having at least a RAM and a ROM, and a display unit 330 that displays various information.

[0047] The control unit 310 has a calculation unit 311 that calculates the residual chlorine concentration of the liquid to be measured using the measurement value of the first sensor 120, and a calibration unit 312 that calibrates the first sensor 120 using the measurement value of the first sensor 120 and the measurement value of the second sensor 220. The control unit 310 is configured to realize the functions of the calculation unit 311 and the calibration unit 312 described below by expanding the measurement program and the calibration program stored in the ROM into the RAM and having the CPU interpret and execute them.

[0048] Here, the measurement program is a program that causes the quantity measuring device 1 to execute a first measurement process that measures a first quantity value of the liquid to be measured by the first sensor 120 arranged on the first path R1 along which the liquid to be measured flows, and a calculation process that calculates the residual chlorine concentration of the liquid to be measured using the measurement value of the first sensor 120. The calibration program is a program that causes the quantity measuring device to execute a first measurement process that measures a first quantity value of the liquid to be measured by the first sensor 120 arranged on the first path R1 along which the liquid to be measured flows, a second measurement process that measures the first quantity value of the liquid to be measured by the second sensor 220 arranged in a measurement environment less susceptible to deterioration than the first sensor 120, and a calibration process that calibrates the first sensor 120 using the measurement value of the first sensor 120 and the measurement value of the second sensor 220.

[0049] The calculation unit 311 is configured to calculate the residual chlorine concentration of the liquid to be measured using the voltage value measured by the first sensor 120. Specifically, the calculation unit 311 is configured to calculate the residual chlorine concentration of the liquid to be measured based on the voltage value measured by the first sensor 120 and a calibration curve C showing the relationship between the residual chlorine concentration and the voltage. The calibration curve C is stored in advance in the storage unit 320, and can be corrected by the calibration unit 312 as described later.

[0050] The calibration unit 312 is configured to calibrate the first sensor 120 using a voltage value measured by the first sensor 120 and a voltage value measured by the second sensor 220. As described above, in this embodiment, the second sensor 220 is placed in a measurement environment in which it is less susceptible to deterioration than the first sensor 120, and therefore has higher measurement accuracy than the first sensor 120. Therefore, the calibration unit 312 can calibrate the first sensor 120 by using the measurement value of the second sensor 220 as a reference value.

[0051] Specifically, as shown in Fig. 4, the calibration unit 312 is configured to calculate the residual chlorine concentration of the liquid to be measured using the voltage value measured by the second sensor 220, and correct the calibration curve C stored in the storage unit 320 based on the calculated residual chlorine concentration and the voltage value measured by the first sensor 120 (see the calibration curve C' in Fig. 4). The calculation of the residual chlorine concentration by the calibration unit 312 is performed based on the voltage value measured by the second sensor 220 and the calibration curve showing the relationship between the residual chlorine concentration and the voltage, as in the calculation unit 311. The calibration curve C used by the calculation unit 311 is data related to the first sensor 120, and the calibration curve used by the calibration unit 312 is data related to the second sensor 220.

[0052] The display unit 330 is a display, and is configured to display various information such as the residual chlorine concentration of the measurement target liquid calculated by the calculation unit 311 and the correction value calculated by the calibration unit 312.

[0053] [Measurement and calibration methods] Next, a measurement method and a calibration method using the quantity measuring device 1 will be described.

[0054] <Advance preparation> The user connects the first measuring member 100 and the second measuring member 200 of the quantity measuring device 1 to a flow path through which the liquid to be measured flows. Specifically, as shown in FIG. 2, the first upstream connecting portion 132 of the first measuring member 100 is connected to the first flow path F1, and the first downstream connecting portion 133 of the first measuring member 100 is connected to the second flow path F2. In addition, the second upstream connecting portion 232 of the second measuring member 200 is connected to the second flow path F2, and the second downstream connecting portion 233 of the second measuring member 200 is connected to the third flow path F3. As a result, the liquid to be measured flows through the first flow path F1, the first path R1, the second flow path F2, the second path R2, and the third flow path F3.

[0055] <Measurement method> First, the first sensor 120 of the first measuring member 100 measures a voltage value corresponding to the residual chlorine concentration of the liquid to be measured. Specifically, when the first working electrode 121 and the first reference electrode 122 of the first sensor 120 come into contact with the liquid to be measured, a voltage corresponding to the residual chlorine concentration of the liquid to be measured is generated between the first working electrode 121 and the first reference electrode 122 by an oxidation-reduction reaction, and the voltage value is measured. Next, the calculation unit 311 of the device main body 300 calculates the residual chlorine concentration of the liquid to be measured based on the voltage value measured by the first sensor 120 and the calibration curve C showing the relationship between the residual chlorine concentration and the voltage. The residual chlorine concentration of the liquid to be measured calculated by the calculation unit 311 is displayed on the display unit 330 of the device main body 300. The measurement by the first sensor 120 may be performed continuously or intermittently at a predetermined interval. An example of a method for intermittently performing measurement by the first sensor 120 is to turn on / off the electrical connection between the first sensor 120 and the device body 300. The on / off switching may be performed automatically or manually at a predetermined timing or at an arbitrary timing. The predetermined timing may be a timing that is specified in advance, or may be a timing that is derived using a trained model. Machine learning may be continued without using a trained model.

[0056] <Calibration method> First, the first sensor 120 of the first measuring member 100 and the second sensor 220 of the second measuring member 200 measure voltage values ​​corresponding to the residual chlorine concentration of the liquid to be measured (first measurement step and second measurement step). The configuration for measuring the voltage value by the second sensor 220 is similar to that of the first sensor 120, so a description thereof will be omitted. Next, the calibration unit 312 of the device main body 300 corrects the calibration curve C stored in the memory unit 320 using the voltage value measured by the first sensor 120 and the residual chlorine concentration calculated using the voltage value measured by the second sensor 220 (calibration step).

[0057] [Advantages of the quantity measuring device according to this embodiment] Thus, the quantity measuring device 1 of this embodiment comprises a first sensor 120 capable of measuring a first quantity value of the liquid to be measured (object to be measured), a second sensor 220 capable of measuring the first quantity value of the liquid to be measured, and a calibration unit 312 that calibrates the first sensor 120 using the measurement values ​​of the first sensor 120 and the second sensor 220, the first sensor 120 being arranged to be located on a first path R1 through which the liquid to be measured flows, and the second sensor 220 being arranged in a measurement environment in which it is less susceptible to deterioration than the first sensor 120.

[0058] According to the quantity measuring device 1 having such a configuration, the first sensor 120 is located on the first path R1, so that the liquid to be measured is the same or approximately the same every time. Therefore, the frequency of calibration of the first sensor 120 can be reduced in the first place. Also, according to the quantity measuring device 1 having the above configuration, the first sensor 120 can be automatically calibrated using the voltage value of the first sensor 120 and the residual chlorine concentration of the second sensor 220. This makes it possible to reduce the frequency of manual calibration, and since the first sensor 120 can be calibrated without removing it from the first path R1, the burden on the user during calibration can be significantly reduced. For example, if the first sensor 120 must be manually calibrated every 40 measurements, it will be calibrated every 8 days if five measurements are made per day. In the case where this manual calibration is performed using the second sensor 220, if the second sensor 220 also needs to be manually calibrated every 40 measurements, the second sensor 220 will be manually calibrated when the number of measurements of the first sensor 120 reaches 40×40=1600. In other words, by using this method, the frequency of manual calibration of the first sensor 120 can be reduced from once every 8 days to once every 320 days (1600 times÷5 times / day=320 days, approximately once a year) by using the second sensor 220 (this manual calibration may be performed only for the second sensor 220, or for both the first sensor 120 and the second sensor 220). If the first sensor 120 needs to be calibrated, for example, every 3 months, instead of every 8 days, the frequency of manual calibration can be further reduced.

[0059] Furthermore, according to the quantity measuring device 1 having the above configuration, the second sensor 220 is placed in a measurement environment where it is less likely to deteriorate than the first sensor 120, and has higher measurement accuracy than the first sensor 120, so the first sensor 120 can be calibrated based on the measurement value of the second sensor 220. Therefore, it is possible to realize highly accurate measurement and calibration without using high-precision, expensive sensors as the first sensor 120 and the second sensor 220. In other words, it is possible to use low-precision, inexpensive sensors as the first sensor 120 and the second sensor 220, so costs can be reduced.

[0060] In the quantity measuring device 1 according to one example of this embodiment, the second sensor 220 is provided so as to be located on the second route R2 along which the liquid to be measured flows, and the second sensor 220 is configured to be switchable between a measurement state and a non-measurement state, and is configured so that the measurement interval for the second sensor 220 is longer than the measurement interval for the first sensor 120. According to the quantity measuring device 1 having such a configuration, since the measurement interval for the second sensor 220 is longer than the measurement interval for the first sensor 120, wear of the second sensor 220 can be suppressed more than that of the first sensor 120. In other words, the second sensor 220 can be placed in a measurement environment in which it is less likely to deteriorate than the first sensor 120.

[0061] In another example of the present embodiment, the quantity measuring device 1 is provided so as to be located on the second path R2 through which the liquid to be measured flows, and the cross-sectional area of ​​the space in which the second sensor 220 is disposed is larger than the cross-sectional area of ​​the space in which the first sensor 120 is disposed. According to the quantity measuring device 1 having such a configuration, since the cross-sectional area of ​​the space in which the second sensor 220 is disposed is larger than the cross-sectional area of ​​the space in which the first sensor 120 is disposed, the flow rate of the liquid to be measured flowing through the space in which the second sensor 220 is disposed can be made slower than that of the liquid to be measured flowing through the space in which the first sensor 120 is disposed. As a result, the second sensor 220 has a lower amount of contact with the substance contained in the liquid to be measured due to wear of the sensor compared to the first sensor 120, so the second sensor 220 can be disposed in a measurement environment in which it is less likely to deteriorate than the first sensor 120.

[0062] In a quantity measuring device 1 according to yet another example of the present embodiment, the second sensor 220 is provided so as to be located on the second path R2 along which the liquid to be measured flows, and a switching unit 400 is provided between the first path R1 and the second path R2, capable of switching between a flowing state in which the liquid to be measured flows along the second path R2 and a non-flowing state in which the liquid to be measured does not flow along the second path R2. According to the quantity measuring device 1 having such a configuration, the flowing state can be set only when the measurement is performed by the second sensor 220, and the non-flowing state can be set when the measurement is not performed by the second sensor 220, and the measurement interval for the second sensor 220 can be made longer than the measurement interval for the first sensor 120, so that the second sensor 220 can be placed in a measurement environment in which it is less likely to deteriorate than the first sensor 120.

[0063] The quantity measuring device 1 according to this embodiment includes a first flow cell 130 capable of accommodating a first sensor 120, and a second flow cell 230 capable of accommodating a second sensor 220. According to the quantity measuring device 1 having such a configuration, the first sensor 120 can be positioned on the first path R1, and the second sensor 220 can be positioned on the second path R2.

[0064] [Variations] The quantity measuring device, calibration program, and calibration method according to the present invention are not limited to the above-described embodiments, and various modifications and combinations can be made within the scope that does not deviate from the technical concept of the present invention.

[0065] In the above-mentioned embodiment, the measurement object is described as a liquid (measurement object liquid), but the present invention is not limited to this. Therefore, as the first sensor 120 and the second sensor 220, various sensors according to the measurement object can be used as long as they are sensors that require calibration like the electrodes in the above-mentioned embodiment.

[0066] In the above-mentioned embodiment, the first sensor 120 measures a voltage value, and the calculation unit 311 calculates the residual chlorine concentration of the liquid to be measured using the voltage value measured by the first sensor 120. However, the present invention is not limited to this, and the first sensor 120 may measure a current value corresponding to the residual chlorine concentration of the liquid to be measured, and the calculation unit 311 may calculate the residual chlorine concentration of the liquid to be measured using the current value measured by the first sensor 120. In other words, the measurement may be performed by a so-called polarographic method, not by a so-called galvanic method.

[0067] In the above-mentioned embodiment, the second sensor 220 is configured to measure a first quantity value of the liquid to be measured, but the present invention is not limited to this, and may be configured to measure a second quantity value that is correlated with the first quantity value. In the above-mentioned embodiment, the first quantity value is a voltage value corresponding to the residual chlorine concentration of the liquid to be measured, and the second quantity value that is correlated with such a first quantity value is, for example, a current value corresponding to the residual chlorine concentration of the liquid to be measured.

[0068] In the above-described embodiment, the first sensor 120 and the second sensor 220 are electrodes, and the calculation unit 311 calculates the residual chlorine concentration of the liquid to be measured using the measurement value of the first sensor 120. However, the present invention is not limited to this, and the calculation unit 311 may be configured to calculate other quantity values ​​of the liquid to be measured, and the first sensor 120 and the second sensor 220 may be other sensors according to the quantity values ​​calculated by the calculation unit 311. For example, an optical sensor or an acoustic sensor may be used as the first sensor 120 and the second sensor 220. As with electrodes, such optical sensors and acoustic sensors are subject to dirt, scratches, wear-induced deterioration, aging deterioration, and the like, and therefore require high calibration, and therefore there is a significance in applying them as the first sensor 120 and the second sensor 220.

[0069] In the above-described embodiment, as an example of a measurement environment that is less susceptible to deterioration, a configuration in which the switching unit 400 is provided between the first path R1 and the second path R2, i.e., a configuration in which the switching unit 400 is provided between the first flow cell 130 and the second flow cell 230, has been described. However, this is not limited to this, and a configuration in which the first flow cell 130 and the second flow cell 230 are arranged in parallel and the switching unit 400 is provided upstream of the first flow cell 130 and the second flow cell 230 may also be used.

[0070] In the above-mentioned embodiment, the configuration in which the quantity measuring device 1 includes the first flow cell 130 and the second flow cell 230, and the first flow cell 130 and the second flow cell 230 include the first path R1 and the second path R2, respectively, has been described, but is not limited thereto, and the quantity measuring device 1 may not include the first flow cell 130 and the second flow cell 230, and the first sensor 120 and the second sensor 220 may be directly attached to the flow path. In other words, the flow path may be a part of the configuration of the quantity measuring device 1 and function as the first path R1 and the second path R2.

[0071] In the above-described embodiment, a configuration has been described in which the calibration unit 312 corrects the calibration curve C showing the relationship between the residual chlorine concentration and the voltage, but this is not limited to this, and the calibration curve can be corrected according to the type of sensor applied to the first sensor 120 and the second sensor 220.

[0072] In the above-described embodiment, the second measuring member 200 is provided downstream of the first measuring member 100. However, this is not limited to this, and the second measuring member 200 may be provided upstream of the first measuring member 100.

[0073] In the above-described embodiment, the method of correcting the calibration curve C has been described as the method of calibrating the first sensor 120, but the present invention is not limited thereto. For example, the calibration unit 312 may use the voltage value measured by the first sensor 120 and the voltage value measured by the second sensor 220 to calculate a correction value for correcting the voltage value measured by the first sensor 120, and the calculation unit 311 may use the correction value to correct the voltage value and then calculate the residual chlorine concentration. Examples of the method of calculating the correction value include a method of calculating the difference between the voltage value measured by the first sensor 120 and the voltage value measured by the second sensor 220 as the correction value, and a method of storing a calculation formula for calculating the correction value in the storage unit 320 in advance and calculating the correction value based on the voltage value measured by the first sensor 120, the voltage value measured by the second sensor 220, and the calculation formula stored in the storage unit 320.

[0074] In addition, calibration by the calibration unit 312 may use various combinations, such as the residual chlorine concentration in the first sensor 120 and the residual chlorine concentration in the second sensor 220, the current value in the first sensor 120 and the residual chlorine concentration in the second sensor 220, the current value in the first sensor 120 and the current value in the second sensor 220, etc.

[0075] It is apparent from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of symbols]

[0076] 1: Quantity measuring device 100: First measuring member 110: First rod member 120: First sensor 121: First working electrode 122: First reference electrode 130: First flow cell 131: First storage section 131a: First storage space 131b: First insertion slot 132: First upstream connection 132a: First upstream flow space 132b: First inlet 133: First downstream connection part 133a: First downstream flow space 133b: First outlet 200: Second measuring member 210: Second rod member 220: Second sensor 221: Second working electrode 222: Second reference electrode 230: Second flow cell 231: Second storage section 231a: Second storage space 231b: Second insertion slot 232: Second upstream connection 232a: Second upstream flow space 232b: Second inlet 233: Second downstream connection part 233a: Second downstream flow space 233b: Second outlet 300: Device body 310: Control section 311: Calculation section 312: Proofreading Department 320: Storage section 330: Display section 400: Switching section

Claims

1. A first sensor capable of measuring a first quantity value of a measurement object; a second sensor capable of measuring the first quantity value of the object to be measured or a second quantity value correlated with the first quantity value; a calibration unit that calibrates the first sensor by using a measurement value of the first sensor and a measurement value of the second sensor; Equipped with The first sensor is provided so as to be located on a first path along which a measurement object flows, The second sensor is disposed in a measurement environment in which deterioration is less likely to occur than in the first sensor. Quantity measuring device.

2. The second sensor is provided so as to be located on a second path along which the measurement object flows, The second sensor is configured to be switchable between a measurement state and a non-measurement state, A measurement interval for the second sensor is configured to be longer than a measurement interval for the first sensor. The quantity measuring device according to claim 1 .

3. The second sensor is provided so as to be located on a second path along which the measurement object flows, The cross-sectional area of ​​the space in which the second sensor is disposed is larger than the cross-sectional area of ​​the space in which the first sensor is disposed. The quantity measuring device according to claim 1 .

4. The second sensor is provided so as to be located on a second path along which the measurement object flows, Between the first path and the second path, a switching unit is provided that can switch between a flow state in which the measurement object flows through the second path and a non-flow state in which the measurement object does not flow through the second path. The quantity measuring device according to claim 1 .

5. a first flow cell capable of accommodating the first sensor; a second flow cell capable of accommodating the second sensor; Equipped The quantity measuring device according to any one of claims 1 to 4.

6. the first sensor and the second sensor each have a working electrode and a reference electrode; The working electrode is a silver / silver chloride electrode. The quantity measuring device according to any one of claims 1 to 4.

7. A calibration program for causing a quantity measuring device including a first sensor capable of measuring a first quantity value of a measurement object and a second sensor capable of measuring the first quantity value of the measurement object or a second quantity value correlated with the first quantity value to execute a calibration process for calibrating the first sensor, a first measurement process for measuring the first quantity value of the measurement object by the first sensor disposed on a first path along which the measurement object flows; a second measurement process for measuring the first quantity value or the second quantity value of the measurement object by the second sensor arranged in a measurement environment less susceptible to deterioration than the first sensor; a calibration process for calibrating the first sensor using the measurement value of the first sensor and the measurement value of the second sensor; The quantity measuring device executes the Calibration program.

8. A calibration method for calibrating a first sensor using a first sensor capable of measuring a first quantity value of a measurement object and a second sensor capable of measuring the first quantity value of the measurement object or a second quantity value correlated with the first quantity value, the method comprising: a first measurement step of disposing the first sensor on a first path along which the object to be measured flows and measuring the first quantity value of the object to be measured by the first sensor; a second measurement step of placing the second sensor in a measurement environment less susceptible to deterioration than the first sensor, and measuring the first quantity value or the second quantity value of the measurement object by the second sensor; a calibration step of calibrating the first sensor using a measurement value of the first sensor and a measurement value of the second sensor; Calibration methods including:

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