JP2008190969A - Measuring device and data table setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring device for measuring pH or electrical conductivity and a data table setting method, capable of easily and rapidly setting an optionally settable data table. <P>SOLUTION: The measuring device 1 comprises a pH measuring electrode 21 for outputting a signal responsive to a pH value of solution, a temperature detecting means 23 for outputting a signal responsive to temperature of the solution, a body 10 connected to the pH measuring electrode 21 and temperature detecting means 23, a storing means 13 for storing a pH-temperature characteristic data table that is disposed in the body 10 and shows the relation between the pH of standard solution and temperature, a signal processing means 11 that is disposed in the body 10, extracts, from the storing means 13, the pH value responsive to the signal output by the temperature detecting means 23 according to the temperature of the standard solution, and performs calibration using the pH value, and an incorporating means 14 for incorporating the pH-temperature characteristic data table to be stored in the storing means 13 disposed in the body 10 from the information transmission medium 2 outside the body 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a measuring device for measuring pH or electrical conductivity, and a data table setting method used in the measuring device.

  Conventionally, a pH measurement electrode having a hydrogen ion-selective sensitive membrane has been used for measuring the pH (hydrogen ion concentration) of a solution, and a typical example is a glass electrode using glass as a pH sensitive membrane. When actually measuring the pH of a solution, the pH measurement electrode is used as a working electrode, and the working electrode is used together with a comparison electrode such as a sweet potato electrode or a silver-silver chloride electrode (measurement solution, test solution). ) And determine the pH value of the solution to be measured from the potential difference between the two electrodes.

  A direct potentiometric method is widely used for measuring the pH of a solution, and prior to measuring the pH of a solution to be measured, a pH measuring electrode is usually connected to two pH 6.86 and pH 4.01 or pH 9.18. Immerse in standard solution and perform 2-point calibration. In some cases, three-point calibration is performed using the above three standard solutions having different pHs. The above three standard solutions are those defined by JIS. More specifically, for example, the potential difference between the pH measurement electrode and the comparison electrode is directly read with an indicator of the measurement device and calibrated, and then the pH of the solution to be measured is measured.

  Here, since the pH of the standard solution changes depending on the temperature, in order to perform accurate calibration, it is necessary to measure the temperature of the standard solution and perform calibration with the pH value at the measured temperature. Therefore, in recent years, a ROM (read only memory) is incorporated in the measuring device, and the pH-temperature characteristic data table for each standard solution is stored in advance in this ROM, and when the pH measuring electrode is calibrated, Some standards measure the temperature of each standard solution, take out the pH value corresponding to the temperature with reference to the pH-temperature characteristic data table stored in the ROM, and automatically calibrate with the taken-out pH value .

  In addition, the user may desire to calibrate the pH measurement electrode with an arbitrary standard solution other than the predetermined standard solution stored in the ROM. In this case, a pH-temperature characteristic data table showing the temperature dependence of the pH of a desired arbitrary standard solution, which has been examined in advance by the user, is input into the measuring apparatus by using a key provided in the measuring apparatus. Some of them are stored in a random access memory (RAM) (Patent Document 1). Thus, when calibrating using any standard solution, the pH value corresponding to the temperature of the standard solution is taken out from the pH-temperature characteristic data table stored in the RAM, and the pH value corresponding to the taken-out pH value is automatically selected. Can be calibrated.

  On the other hand, conventionally, it is widely performed to measure the electrical conductivity of a solution and to investigate, for example, the ratio of the electrolyte in the solution. In general, the electrical conductivity of a solution depends on the ions present in the solution and follows Ohm's law as well as metal conductors. In the case of a solution, the electrical resistance between two opposing faces of 1 m 3 is expressed as resistivity, and the reciprocal thereof is expressed in units of S / m as electrical conductivity. As a method for measuring the electrical conductivity, an electrical conductivity measurement electrode (electrical conductivity cell) including at least a pair of electrodes is immersed in the solution to be measured, and a voltage is applied between the electrodes to thereby measure the electrical conductivity of the solution to be measured. There is a so-called electrode method in which resistance is measured to determine electrical conductivity. More specifically, for example, a sine wave or rectangular wave AC voltage is applied between the electrodes of the cell, and a current flowing between the electrodes is detected and converted into electrical conductivity.

By the way, even if the solute concentration of the solution is the same, the electrical conductivity of the solution varies depending on the temperature of the solution. Therefore, the electrical conductivity of the solution is generally displayed in terms of electrical conductivity at the reference temperature. The converted value of electrical conductivity is calculated by the following formula 1.
k _T = k _t / {1 + α / 100 × (t−T)} (1)
(Where, T is the reference temperature [° C.], t is the temperature of the solution [° C.], k _T is the electrical conductivity converted into T ° C., kt is the electrical conductivity at t ° C., and α is the temperature coefficient of the solution [%]. )

  Usually, the reference temperature T is set to 25 ° C. In general, the temperature coefficient α is preset as a fixed value (for example, 2.00%) in a ROM or the like incorporated in the measuring apparatus. This is because the electrical conductivity of a normal aqueous solution at room temperature changes by about 2% with a temperature change of 1 ° C. Therefore, in a general application, the electrical conductivity is sufficiently accurate by setting the temperature coefficient α to 2.00%. This is because the rate can be measured.

  However, depending on the measurement system, the temperature coefficient α varies depending on the temperature, and if the temperature coefficient α is handled as a fixed value, the electrical conductivity may not be measured with a desired accuracy. In such a case, the user can input a temperature coefficient-temperature characteristic data table indicating the temperature dependence of the temperature coefficient α in a desired measurement system previously examined by a user using a key provided in the measurement apparatus. Some are stored in a RAM incorporated in the measuring apparatus.

  Conventionally, the concentration of the solution is determined from the measured value of the electrical conductivity of the solution by previously investigating the relationship between the electrical conductivity of the solution and the concentration of the solute in the solution in any desired measurement system. Has been done. At this time, instead of instructing the electrical conductivity to the measuring device and calculating the concentration of the solution manually, an electrical conductivity-concentration conversion data table showing the relationship between the electrical conductivity and the concentration obtained in advance by the user is created. By inputting using a key provided on the measuring device, it is stored in a RAM built in the measuring device, and the measuring device automatically converts the electrical conductivity into a concentration and gives an instruction. Can do.

  In this way, in the measurement of pH, electrical conductivity, or concentration by a pH measuring device or an electrical conductivity measuring device, when the detected value changes nonlinearly due to changes in the temperature of the solution, etc., or the concentration is converted by conversion. When obtaining, a data table for calibration or measurement is often created and stored in a storage means provided in the measuring apparatus.

This data table can be stored in advance in a storage means provided in the measuring device if it relates to a standard substance defined by JIS, for example. However, in the case of a standard substance or a special substance that does not have a clear definition, it has been necessary to manually store it in the storage means using a key provided in the measuring apparatus.
JP-A-5-133927

  However, the data table as described above is generally composed of several to several tens of setting data, and setting manually using a key provided in the measuring apparatus is a troublesome work and may cause an error. There is also sex.

  In particular, for the purpose of reducing the size of the measuring device itself, a sufficient amount of keys such as a numeric keypad is not provided. Instead, a single or multiple keys are used to sequentially select characters on the display screen. When the data table is entered after confirmation, it becomes very complicated work.

  Conventionally, the data table stored in the storage means of a certain measuring apparatus can only be used by the measuring apparatus alone. For this reason, when there are one or more measuring devices that should store the same data table, it is necessary to manually store the data table individually in the storage means of each measuring device. Such an operation is extremely cumbersome, time consuming and increases the possibility of making mistakes.

  Accordingly, one of the objects of the present invention is to provide a measuring apparatus for measuring pH or electrical conductivity and a data table setting method capable of easily and quickly setting a data table that can be arbitrarily set. .

  Another object of the present invention is to provide a measuring device for measuring pH or electrical conductivity, and a data table setting method, which can easily, quickly and accurately set the same data table in a plurality of measuring devices. Is to provide.

  The above object is achieved by a measuring apparatus and a data table setting method according to the present invention. In summary, according to the first aspect of the present invention, a pH measurement electrode that outputs a signal according to the pH value of the solution; a temperature detection means that outputs a signal according to the temperature of the solution; the pH measurement electrode and the A main body to which temperature detection means is connected; storage means provided in the main body for storing a pH-temperature characteristic data table indicating the relationship between pH and temperature of the standard solution; provided in the main body and the standard Signal processing means for taking out a pH value corresponding to a signal output from the temperature detecting means in accordance with the temperature of the liquid from the storage means and performing calibration using the pH value; and the storage provided in the main body Means for taking in the pH-temperature characteristic data table stored in the means from an information transmission medium outside the main body, and the pH-temperature characteristic data table stored in the storage means outside the main body Measuring apparatus characterized by having a are provided, at least one of the output means for outputting the information delivery media.

  According to the second aspect of the present invention, an electrical conductivity measurement electrode that outputs a signal corresponding to the electrical conductivity of the solution; a temperature detection means that outputs a signal corresponding to the temperature of the solution; and the electrical conductivity measurement electrode; A main body to which the temperature detecting means is connected; a storage means provided in the main body for storing a temperature coefficient-temperature characteristic data table indicating a relationship between a temperature coefficient representing temperature dependence of electrical conductivity and temperature; A signal processing unit provided in the main body, which takes out a temperature coefficient value corresponding to a signal output from the temperature detection unit from the storage unit, and performs temperature compensation of a measured value of electrical conductivity using the temperature coefficient value; A means for taking in the temperature coefficient-temperature characteristic data table stored in the storage means provided in the main body from an information transmission medium external to the main body; and the storage means stored in the storage means - degree coefficient of at least one of the output means of the temperature characteristic data table output to the outside of the information carrier of the body; measuring apparatus characterized by having a are provided.

  According to the third aspect of the present invention, an electrical conductivity measurement electrode that outputs a signal corresponding to the electrical conductivity of the solution; a main body to which the electrical conductivity measurement electrode is connected; Storage means for storing an electrical conductivity-concentration conversion data table indicating the relationship between the rate and the concentration; a concentration value provided in the main body and corresponding to a signal output from the electrical conductivity measurement electrode; A signal processing means for taking out and converting the measured value of electrical conductivity into a measured value of concentration; and the electrical conductivity-concentration converted data table stored in the storage means provided in the main body; At least one of the capturing means for capturing from the information transmission medium and the output means for outputting the electrical conductivity-concentration conversion data table stored in the storage means to the information transmission medium outside the main body. One; measuring apparatus characterized by having a are provided.

  Further, according to the fourth aspect of the present invention, the pH-temperature characteristic data table showing the relationship between the pH and temperature of the standard solution used in the measuring apparatus, the temperature coefficient showing the temperature dependence of the electrical conductivity, and the temperature. A method of setting a data table which is a temperature coefficient-temperature characteristic data table indicating a relationship, or an electric conductivity-concentration conversion data table indicating a relationship between electric conductivity and concentration, and includes a device external to the measurement apparatus. Using to input the data table, transmitting the input data table via an information transmission medium, capturing the transmitted data table into the measuring device, and the captured data And a step of storing the table in a storage means provided in the measuring apparatus. A data table setting method is provided.

  Furthermore, according to the fifth aspect of the present invention, the pH-temperature characteristic data table showing the relationship between the pH and temperature of the standard solution used in the measuring apparatus, the temperature coefficient representing the temperature dependence of the electrical conductivity, and the temperature. A method of setting a data table which is a temperature coefficient-temperature characteristic data table indicating a relationship or an electric conductivity-concentration conversion data table indicating a relationship between electric conductivity and concentration, wherein the data table is stored in the measurement apparatus. Storing the storage means in the storage means, transmitting the stored data table via an information transmission medium, capturing the transmitted data table in a device external to the measurement device, And storing the captured data table in a storage means provided in the device. A data table setting method is provided.

  According to the present invention, a data table that can be arbitrarily set can be set easily and quickly. Further, according to the present invention, the same data table can be easily, quickly and accurately set in a plurality of measuring devices.

  Hereinafter, a measuring apparatus and a data table setting method according to the present invention will be described in more detail with reference to the drawings.

Example 1
[Overall configuration of measuring device]
FIG. 1 is a schematic block diagram showing an embodiment of a measuring apparatus according to the present invention. In this embodiment, the measuring device 1 is a pH measuring device used for measuring the pH of the solution.

  The measurement apparatus 1 includes a main body 10 and a measurement unit 20 connected to the main body 10. The measurement unit 20 includes a pH measurement electrode 21, a comparison electrode 22, and a temperature sensor 23 as temperature detection means. The pH measurement electrode 21 is a glass electrode, the comparison electrode 22 is a silver-silver chloride electrode, and the temperature sensor 23 is a resistance temperature detector. In the present embodiment, the pH measurement electrode 21, the comparison electrode 22, and the temperature sensor 23 of the measurement unit 20 are integrally configured as a pH composite electrode.

  The main body 10 has a controller 11 as signal processing means (control means) for comprehensively controlling the operation of the measuring apparatus 1. The main body 10 has a ROM 12 as a first storage means for storing a predetermined program and data, connected to the controller 11, and a second storage means for storing an arbitrarily set data table, which will be described in detail later. A RAM 13, an analog-digital converter (A / D converter) 16 that performs analog-digital conversion (A / D conversion) on the signal from the measurement unit 20, a display unit 17 that displays measurement values, various setting values, and the like. An operation unit 18 is provided as an input means for inputting an instruction to start or stop a measurement operation or a calibration operation or various set values. The operation unit 18 is provided with keys for inputting data.

  Further, the main body 10 is connected to the controller 11 with a first interface unit 14 capable of USB (Universal Serial Bus) connection and a second interface unit 15 capable of LAN (local area network) connection. Is provided.

  In addition, although detailed explanation is omitted for the main body 10, a power source for supplying power to each part of the main body 10 or outputting a measurement voltage to the measurement unit 10 and an output signal of the measurement unit 20 are appropriately amplified. An amplifier or the like is provided.

  When measuring the pH of the solution to be measured, the measurement unit 20 that is a pH composite electrode is immersed in the solution to be measured 61 accommodated in a container 6 such as a beaker. Then, output voltage signals from the pH measurement electrode 22 and the comparison electrode 23 (signals corresponding to the potential difference between the pH measurement electrode 21 and the comparison electrode 22) are appropriately amplified in the main body 10 and A / D converted. The digital signal is converted by the device 16 and input to the controller 11. The signal input to the controller 11 is subjected to signal processing in the controller 11, and a potential difference between the pH measurement electrode 21 and the comparison electrode 22 is detected, and a pH value corresponding to the detected potential difference is determined. And the controller 11 outputs the signal which displays the determined pH value on the display part 17 of the main body 10, for example. At this time, the output voltage signal from the temperature sensor 23 is also appropriately amplified in the main body 10, converted into a digital signal by the A / D converter 16, and input to the controller 11. The controller 11 can determine the temperature-compensated pH value from the potential difference between the pH measurement electrode 21 and the comparison electrode 23 using the temperature detection result by the temperature sensor 23.

[Calibration operation]
(1) Calibration using a predetermined standard solution The ROM 12 as the first storage means connected to the controller 11 has a predetermined standard solution (usually pH 6.86, pH 4.01, pH 9 defined by JIS). PH-temperature characteristic data table of .18 standard solutions). On the other hand, the RAM 13 as the second storage means connected to the controller 11 stores a pH value-temperature characteristic data table of any standard solution desired by the user.

  Calibration with a predetermined standard solution using the pH-temperature characteristic data table stored in the ROM 12 is performed as follows. That is, the measurement unit 20 that is a pH composite electrode is immersed in a predetermined standard solution 62 housed in an appropriate container 6 such as a beaker. Then, the controller 11 extracts the pH value corresponding to the signal output from the temperature sensor 23 according to the temperature of the standard solution 62 from the pH-temperature characteristic data table of the standard solution 62 stored in the ROM 12. Then, the indicated value for the signal corresponding to the potential difference between the pH measurement electrode 21 and the comparison electrode 22 at that time is calibrated by the extracted pH value. Usually, two-point calibration is performed by dipping in two standard solutions of pH 6.86 and pH 4.01 or pH 9.18. In some cases, three-point calibration is performed using the above three standard solutions having different pHs.

(2) Calibration using an arbitrary standard solution (2-1) Setting of data table Next, a pH-temperature characteristic data table (calibration data table) of an arbitrary standard solution desired by a user not stored in the ROM 12 A method for storing the data in the RAM 13 will be described.

  In this embodiment, the operator does not manually input a data table composed of a large number of data manually by using the keys provided in the measuring apparatus 1 but instead of an information transmission medium (information) external to the measuring apparatus 1. The data table can be set / saved in the RAM 13.

  Here, the information transmission medium may be storage means that is removable from the measuring apparatus 1 and an external device (external device) such as a personal computer (hereinafter referred to as “PC”). The information transmission medium may be a communication unit that connects the measuring apparatus 1 and an external device such as a PC so as to communicate with each other. This will be described in more detail below.

  In the present embodiment, the measuring apparatus 1 includes a first interface unit 14 capable of USB connection as a reading unit as a capturing unit in the main body 10. The first interface unit 14 is connected to the controller 11. A USB memory (flash memory) 2 as removable storage means is detachably connected to the first interface unit 14. Then, the controller 11 converts the pH-temperature characteristic data table of a desired arbitrary standard solution stored in advance in the USB memory 2 from the USB memory 2 connected to the first interface unit 14 to the first interface. The data is taken in via the unit 14 and stored in the RAM 13.

  A non-standardized pH-temperature characteristic data table of a standard solution is created in an external device such as a PC, as will be described in detail later, and is usually once possessed by this external device (that is, an external device such as a PC). Or stored in a storage means such as a hard disk (connected to the external device). This external device such as a PC has an interface unit capable of USB connection as reading / writing means. Alternatively, such a pH-temperature characteristic data table can be downloaded from another device via a network (LAN, Internet, etc.) in an external device such as a PC.

  The pH-temperature characteristic data table stored in the storage means of the external device can be written to the USB memory 2 by connecting the USB memory 2 to the external device. Next, as described above, the USB memory 2 can be removed from the external device and connected to the measuring apparatus 1, and the pH-temperature characteristic data table can be collectively loaded from the USB memory 2 into the measuring apparatus 1.

  The operation of storing the pH-temperature characteristic data table in the RAM 13 using the USB memory 2 may be started when the operator inputs a start instruction using a key provided on the operation unit 18. Alternatively, this operation may be started automatically when the controller 11 recognizes that the USB memory 2 is connected to the first interface unit 14.

  On the other hand, in the present embodiment, the measuring apparatus 1 has a second interface unit 15 capable of LAN connection, which is a receiving unit as a capturing unit, in the main body 10. The second interface unit 15 is connected to the controller 11. One end of the LAN cable 3 that is an information communication cable as a communication means is detachably connected to the second interface unit 15. In this embodiment, the other end of the LAN cable 3 is detachably connected to a PC 4 as an external device. The PC 4 as an external device has an interface unit capable of LAN connection as reception / transmission means. Then, the controller 11 sends the pH-temperature characteristic data table of any desired standard solution stored in advance in the storage unit as described above from the storage unit of the PC 4 via the second interface unit 15. And is stored in the RAM 13. Alternatively, pH-temperature characteristic table data input in the PC 4 can be directly written in the RAM 13 of the measuring apparatus 1.

  In this way, when the removable storage means is not used, the pH-temperature characteristic data table of the non-standardized standard solution is directly measured using the communication means for connecting the PC 4 and the measuring device 1. Can be written to the device 1.

  The operation of storing the pH-temperature characteristic data table in the RAM 13 using the LAN cable 3 may be started when the operator inputs a start instruction through the operation unit of the PC 4. Or this operation | movement may be started by inputting a start instruction | indication with the key provided in the operation part 18 of the measuring apparatus 1. FIG.

  As described above, in this embodiment, the data table can be taken into the measuring apparatus from the external device 4 via either the USB 2 or the LAN cable 3.

  FIG. 2 is a schematic flowchart of the above-described data table setting method. That is, the data table setting method is (i) data that is a pH-temperature characteristic data table showing the relationship between the pH and temperature of the standard solution using an external device (external device such as a PC) 4 of the measuring apparatus 1. Inputting a table; (ii) transmitting the input data table via an information transmission medium; (iii) taking the transmitted data table into the measuring device 1; and (iv) Storing the fetched data table in a storage means (RAM) 13 provided in the measuring apparatus 1.

  In one embodiment, the transmitting step (ii) stores the input data table in a storage unit (USB memory) 2 that can be detached from the external device 4 by a writing unit provided in the external device 4. In the step (iii), the data table stored in the removable storage means 2 detached from the external device 4 and connected to the measuring device 1 is read in the measuring device 1. Reading by means (first interface unit) 14. In another embodiment, in the step (ii) of transmitting, the input data table can be communicated between the external device 4 and the measuring apparatus 1 by the transmission means provided in the external device 4. Including the transmission through the communication means (LAN cable) 3 to be connected, and the step (iii) fetching the data table transmitted through the communication means 3 is a reception means (second second) provided in the measuring apparatus 1 Receiving by the interface unit) 15.

  According to an external device such as a PC, a data table composed of several to several tens of setting data, for example, is relatively easy by using an attached keyboard having better operability than the keys provided on the measuring apparatus 1. The data table creation time can be shortened and the occurrence of errors can be reduced. In addition, when downloading a data table from the network, there is no need to create a data table.

  Of course, the measuring apparatus 1 may further be configured to store the data table in the RAM 13 by manual operation using the keys of the operation unit 18 of the main body 10 as in the prior art.

(2-2) Output of Data Table Next, a method for outputting (transferring) the pH-temperature characteristic data table of a desired arbitrary standard solution stored in the RAM 13 from the measuring apparatus 1 will be described.

  In the present embodiment, the data table stored in the RAM 13 of the measuring apparatus 1 is transferred to another measuring apparatus 1 or an external device such as a PC via an information transmission medium (information communication or storage medium) external to the measuring apparatus 1. It can be transferred. Thereby, the same data table can be easily transplanted from one measuring device 1 to another measuring device 1 or an external device such as a PC.

  Here, the information transmission medium may be a storage unit that is removable from the measuring apparatus 1 and an external device such as a PC. The information transmission medium may be a communication unit that connects the measuring apparatus 1 and an external device such as a PC having a storage unit so as to be communicable. This will be described in more detail below.

  In the present embodiment, the first interface unit 14 that functions as the reading unit also functions as a writing unit as an output unit. That is, the USB memory 2 is detachably connected to the first interface unit 14. Then, the controller 11 stores the pH-temperature characteristic data table of a desired arbitrary standard solution stored in the RAM 13 via the first interface unit 14 and the USB memory 2 connected to the first interface unit 14. Remember me.

  Thereafter, the USB memory 2 is removed from the measuring device 1, connected to another measuring device 1, and the desired arbitrary standard solution is stored in the RAM 13 of the other measuring device 1 in the same manner as described above. A pH-temperature characteristic data table can be stored. Alternatively, after storing the pH-temperature characteristic data table of any desired standard solution from the RAM 13, the USB memory 2 is removed from the measuring device 1 and connected to an external device such as a PC. The pH-temperature characteristic data table from the USB memory 2 can be stored in the storage means of the external device. The pH-temperature characteristic data table transferred to the storage means of the external device such as the PC can be transferred to another external device such as the measuring apparatus 1 or the PC in the same manner as described above.

  The operation of storing the pH-temperature characteristic data table in the USB memory 2 may be started when an operator inputs a start instruction using a key provided on the operation unit 18. Alternatively, this operation may be started automatically when the controller 11 recognizes that the USB memory 2 is connected to the first interface unit 14.

  On the other hand, in the present embodiment, the second interface unit 15 that functions as the reception unit also functions as a transmission unit as an output unit. That is, one end of the LAN cable 3 is detachably connected to the second interface unit 15. The other end of the LAN cable 3 is detachably connected to the PC 4. Then, the controller 11 transmits the pH-temperature characteristic data table of any desired standard solution stored in the RAM 13 to the PC 4 via the second interface unit 15. PC4 can memorize | store this pH-temperature characteristic data table in the memory | storage means which PC4 has.

  Thereafter, the pH-temperature characteristic data table stored in the storage means of the PC 4 is stored in the same manner as described above for another measuring device 1 or an external device such as a PC via the USB memory 2 and the LAN cable 3. It can be stored in the storage means.

  The transmission operation of the pH-temperature characteristic data table via the LAN cable 3 may be started when the operator inputs a start instruction through the operation unit of the PC 4. Or this operation | movement may be started by inputting a start instruction | indication with the key provided in the operation part 18 of the measuring apparatus 1. FIG.

  Here, the pH-temperature characteristic data table to be output to other devices stored in the RAM 13 of the measuring apparatus 1 is stored using the USB memory 2 or the LAN cable 3 as described above. Alternatively, it may be input using a key of the operation unit 18 of the measuring apparatus 1 as an alternative method.

  As described above, in this embodiment, the data table can be output from the measuring apparatus 1 to the external device via either the USB 2 or the LAN cable 3.

  FIG. 3 is a flowchart showing an outline of the above-described data table setting method. That is, in the data table setting method, (I) a data table which is a pH-temperature characteristic data table showing the relationship between pH and temperature of a standard solution is stored in a storage means (RAM) 13 provided in the measuring apparatus 1. And (II) transmitting the stored data table via an information transmission medium; and (III) transmitting the transmitted data table to an external device of the measuring apparatus 1 (another measuring apparatus 1 or PC). And (IV) storing the fetched data table in a storage means provided in the external device.

  In one embodiment, in the transmitting step (II), the data table stored in the storage unit 13 in the measuring apparatus 1 is written by the writing unit (first interface unit) 14 provided in the measuring apparatus 1. Including the storage in the storage device (USB memory) 2 detachable from the measuring device 1, and the step (III) of capturing is stored in the removable storage device 2 that is detached from the measuring device 1 and connected to an external device. The read data table is read by a reading means provided in the external device. In another embodiment, in the transmitting step (II), the data table stored in the storage unit 13 in the measurement apparatus 1 is transmitted to the transmission unit (second interface unit) provided in the measurement apparatus 1. ) 15 through the communication means (LAN cable) 3 for communicatively connecting the measuring apparatus 1 and the external device, and the step (III) for fetching the data table transmitted through the communication means 3 Receiving by a receiving means provided in the external device.

  As described above, the pH-temperature characteristic data table of a desired arbitrary standard solution stored in the RAM 13 of a certain measuring device 1 can be transferred (implanted) in a batch to another measuring device 1 or an external device such as a PC. Thus, when there are one or more measuring devices 1 that should store the same data table, it is not necessary to manually store the data table in each measuring device 1, and workability is improved. This greatly improves the data table setting time and greatly reduces the possibility of errors.

(2-3) Creation and calibration operation of data table Here, the pH-temperature characteristic data table of any standard solution desired by the user can be created in advance, for example, as follows. For example, the temperature of the desired arbitrary standard solution is changed every 5 ° C. in the range of 0 ° C. to 100 ° C., and the pH value of the standard solution at that time is measured by the measuring device 1. The relationship between the measured pH value and temperature is input using arbitrary software such as spreadsheet software installed in a PC as an external device, and the PC is used as a data table in CSV format, for example. The data is stored in a storage unit included in an external device.

  The calibration with a desired arbitrary standard solution using the pH-temperature characteristic data table stored in the RAM 13 is substantially the same as the above-mentioned predetermined standard solution except that the pH-temperature characteristic data table to be used is different. The calibration can be performed in the same manner as in the case where calibration is performed using.

  That is, a desired arbitrary standard solution 62 is poured into a suitable container 6 such as a beaker, and the measurement unit 20 serving as a pH composite electrode is immersed in the standard solution 62, and the temperature of the standard solution 62 is measured by the temperature sensor 23. It is measured, converted into a digital signal, supplied to the controller 11, the pH value of the standard solution corresponding to the measured temperature is taken out from the RAM 13 to the controller 11, and the pH measurement electrode 21 and the comparison electrode 22 are used by using this pH value. Calibration of the indicated value corresponding to the signal according to the potential difference between them is performed, and the asymmetric potential, slope, etc. are calculated. That is, the controller 11 takes out the pH value corresponding to the signal output from the temperature sensor 23 in accordance with the temperature of any desired standard solution from the RAM 13, and performs calibration using the pH value. In this case, as described above, since the temperature stored in the RAM 13 is in units of 5 ° C., the pH value for the intermediate temperature can be calculated by an interpolation method or the like, for example. Of course, a finer pH value for each temperature may be stored. The temperature of the standard solution can be measured by the temperature sensor 23 as described above. Therefore, the operation from the temperature measurement until the pH value of the standard solution corresponding to the measurement temperature is taken out and calibrated can be automatically performed.

  As described above, according to this embodiment, it is possible to easily and quickly set a data table that can be arbitrarily set. Further, according to the present embodiment, the same data table can be easily, quickly and accurately set in a plurality of measuring devices.

Example 2
Next, another embodiment of the present invention will be described. FIG. 4 is a schematic block diagram showing another embodiment of the measuring apparatus according to the present invention. In this embodiment, the measuring device 1 is an electric conductivity measuring device used for measuring the electric conductivity of a solution.

  In addition, the same code | symbol is attached | subjected to the element which has the function which is the same as that of the measuring apparatus of Example 1 used as a pH measuring apparatus, or it corresponds, and abbreviate | omits detailed description.

  In this embodiment, the measuring device 1 is configured to measure the electrical conductivity of the solution by an electrode method. That is, the measuring apparatus 1 includes a measuring unit 20 that is an electric conductivity measuring electrode (electric conductivity cell) including a pair of electrodes (platinum black plating electrodes) 24a and 24b. A temperature sensor 23 is also provided integrally with the measurement unit 20.

  When measuring the electrical conductivity, the measuring unit 20 is immersed in the solution to be measured, and an AC voltage is applied between the electrodes 24 a and 24 b of the measuring unit 20 from the AC power source for measuring the electrical conductivity provided in the main body 10. Applied and the current flowing at that time is detected. The detection output of the measurement unit 20 is appropriately amplified in the main body 10, A / D converted by the A / D converter 16, and input to the controller 11. The controller 11 calculates the electric conductivity by correcting the measured value such as a cell constant and temperature, and outputs a signal for displaying the electric conductivity on the display unit 17 provided in the main body 10, for example. In the present embodiment, the measurement unit 20 has two electrodes, but may have more electrodes.

The controller 11 calculates the measured value by the following formula 1,
k _T = k _t / {1 + α / 100 × (t−T)} (1)
(Where, T is the reference temperature [° C.], t is the temperature of the solution [° C.], k _T is the electrical conductivity converted into T ° C., kt is the electrical conductivity at t ° C., and α is the temperature coefficient of the solution [%]. )
Is converted into the electrical conductivity at the reference temperature T. The reference temperature T is 25 ° C., for example.

  By the way, in general applications, the electrical conductivity can be measured with sufficient accuracy by setting the temperature coefficient α to 2.00%. Therefore, in this embodiment, the ROM 12 as the first storage means stores 2.00% as a predetermined temperature coefficient representing the temperature dependence of the electrical conductivity.

  However, depending on the measurement system, when the temperature coefficient α is handled as a fixed value, the electrical conductivity may not be measured with sufficient accuracy. In such a case, it is possible to more accurately compensate the temperature of the electrical conductivity of a solution at an arbitrary temperature by checking the temperature dependence of the temperature coefficient α in advance.

  Therefore, in this embodiment, the temperature coefficient-temperature characteristic data table (measurement data table) in an arbitrary measurement system desired by the user can be stored in the RAM 13 as the second storage means.

  Similar to the pH-temperature characteristic data table in the first embodiment, the temperature coefficient-temperature characteristic data table is created in an external device such as a PC, and is usually temporarily stored in the storage means of the external device. Alternatively, the temperature coefficient-temperature characteristic data table can be downloaded from another device via a network in an external device such as a PC.

  The temperature coefficient-temperature characteristic data table is the same as the pH-temperature characteristic data table in the first embodiment, via the USB memory 2 and / or the LAN cable 15, and the first or second interface 14, 15. Can be taken into the measuring apparatus 1 and stored in the RAM 13.

  Further, the temperature coefficient-temperature characteristic data table stored in the RAM 13 is connected to another measuring device 1 via the USB memory 2 and / or the LAN cable 15 in the same manner as the pH-temperature characteristic data table in the first embodiment. And can be transplanted to an external device such as a PC.

  Here, the temperature coefficient-temperature characteristic data table in an arbitrary measurement system desired by the user can be obtained in advance as follows, for example. The temperature of the solution of a desired arbitrary measurement system whose electrical conductivity at a reference temperature (for example, 25 ° C.) is a predetermined value is changed in increments of 1 ° C., for example, in the range of 0 ° C. to 80 ° C. 1 is used to measure electrical conductivity without temperature compensation. Then, the temperature coefficient at each temperature when the reference temperature is 25 ° C., for example, is calculated from Equation 1 above. The relationship between the temperature coefficient measured in this way and the temperature can be input and stored by a PC or the like as an external device in the same manner as the pH-temperature characteristic data table in the first embodiment.

  When the electrical conductivity of the solution to be measured of a desired measurement system is measured using the temperature coefficient-temperature characteristic data table stored in the RAM 13, the electrodes 24a and 24b are output according to the electrical conductivity of the solution to be measured. The signal output from the temperature sensor 23 is detected according to the temperature of the liquid to be measured. The controller 11 takes out the temperature coefficient α corresponding to the detected temperature from the RAM 13 and converts the electric conductivity of the liquid to be measured into that at the reference temperature by the above equation 1 using the temperature coefficient α. That is, the controller 11 takes out the temperature coefficient value corresponding to the signal output from the temperature sensor 23 according to the temperature of the solution according to the temperature coefficient-temperature characteristic data table stored in the RAM 13, and uses the temperature coefficient value. Perform temperature compensation of measured electrical conductivity.

  As described above, when the measuring device 1 is an electrical conductivity measuring device as in the present embodiment and it is desired to set a desired temperature coefficient-temperature characteristic data table, the same effect as in the first embodiment can be obtained.

Example 3
Next, still another embodiment of the present invention will be described. In the present embodiment, the measuring device is an electric conductivity measuring device similar to that of the second embodiment. The schematic configuration of the measuring apparatus 1 of the present embodiment is as shown in FIG.

  However, in this embodiment, in the measuring apparatus 1, the controller 11 automatically obtains the concentration of the solution to be measured using the relationship between the electrical conductivity of the solution to be measured and the concentration of the solute in the solution to be measured. Be able to.

  That is, in the present embodiment, the electrical conductivity-concentration conversion data table (measurement data table) in an arbitrary measurement system desired by the user can be stored in the RAM 13 as the second storage means.

  The electrical conductivity-concentration conversion data table is created in an external device such as a PC in the same manner as the pH-temperature characteristic data table in the first embodiment and the temperature coefficient-temperature characteristic data table in the second embodiment. It is stored in the storage means of the external device. Alternatively, the temperature coefficient-temperature characteristic data table can be downloaded from another device via a network in an external device such as a PC.

  The electrical conductivity-concentration conversion data table is similar to the pH-temperature characteristic data table in the first embodiment and the temperature coefficient-temperature characteristic data table in the second embodiment, and the USB memory 2 and / or the LAN cable 15 is connected. Via the first or second interface 14, 15, and can be stored in the RAM 13.

  The electrical conductivity-concentration data table stored in the RAM 13 is similar to the pH-temperature characteristic data table in the first embodiment and the temperature coefficient-temperature characteristic data table in the second embodiment, and the USB memory 2 and / or It can be transplanted to another measuring device 1 or an external device such as a PC via the LAN cable 15.

  Here, the electrical conductivity-concentration conversion data table in an arbitrary measurement system desired by the user is prepared as a standard concentration series having different solute concentrations in the desired measurement system, and the relationship between the electrical conductivity and the concentration is shown. By examining it, it can be obtained in advance. For example, the relationship between electrical conductivity and concentration when the reference temperature is 25 ° C. is obtained. The relationship between the electrical conductivity and the concentration measured in this way is the same as in the case of the pH-temperature characteristic data table in the first embodiment and the temperature coefficient-temperature characteristic data table in the second embodiment. Can be entered and saved.

  When measuring the concentration of the measured solution of the desired measurement system using the electrical conductivity-concentration conversion data table stored in the RAM 13, the electrodes 24a and 24b output according to the electrical conductivity of the measured solution. A signal is detected, and a signal output from the temperature sensor 23 is detected according to the temperature of the solution to be measured. First, the controller 11 obtains the electrical conductivity of the solution to be measured at the reference temperature according to the above formula 1. At this time, generally, a fixed value stored in the ROM 12 is used as the temperature coefficient α. Next, the controller 11 extracts the concentration corresponding to the measured electrical conductivity from the electrical conductivity-concentration conversion table stored in the RAM 13, and converts the measured value of electrical conductivity into this concentration. And the controller 11 outputs the signal which displays the calculated | required density | concentration on the display part 17 of the main body 10, for example. That is, the controller 11 takes out the concentration value corresponding to the signal output from the electrical conductivity measuring electrode 20 from the RAM 13 and converts the measured electrical conductivity value into the measured concentration value.

  As described above, when the measuring apparatus 1 is an electrical conductivity measuring apparatus as in the present embodiment and it is desired to set a desired electrical conductivity-concentration conversion table, the same effects as in the first and second embodiments can be obtained. .

  In the above-described embodiments, the present invention has been described according to specific embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as necessary.

  For example, in the above embodiment, the removable storage means is described as being the USB memory 2, but the present invention is not limited to such a mode. For example, any other removable storage means such as a memory card (flash memory), a flexible disk, and a removable hard disk can be used. What is necessary is just to comprise the interface part as a reading means / writing means so that it may adapt to the memory | storage means of each aspect.

  In the above embodiment, the information communication cable is described as being a LAN cable directly connected to the measuring apparatus 1 and the PC 4. However, the present invention is not limited to such a mode. For example, any other information communication cable such as a USB cable can be used. In the above embodiment, the communication means is connected by wire, but may be connected wirelessly. Furthermore, the information communication cable is not limited to the direct connection between the measuring apparatus 1 and the PC 4, but can be connected to a plurality of PCs 4 connected to the LAN, or another single or a plurality of measurements. The device 1 may be connectable. Thereby, the transfer of the data table from the plurality of PCs 4 to the specific measuring device 1, the transfer of the data table from the specific measuring device 1 to the plurality of PCs 4, the single measuring device 1 or a plurality of other measuring devices It is possible to transfer the data table to 1. You may connect the measuring apparatus 1 and another measuring apparatus 1 so that direct communication is possible.

  Moreover, in the said Example, although the measuring apparatus 1 was provided with both the 1st, 2nd interface parts 14 and 15, either of these may be provided. The measuring device 1 may be configured to perform at least one of taking in a data table from an external device into the measuring device 1 and outputting a data table from the measuring device 1 to the external device. .

  Further, a plurality of types of data tables may be stored in the RAM 13 and may be selected and used using, for example, a key provided on the operation unit 18 of the measuring apparatus 1.

  Furthermore, in the said Example, although the measurement result of the measuring apparatus 1 demonstrated as what was displayed on the display part provided in the main body 10, it is not limited to this. For example, the measurement result can be printed and output by a printer connected to the main body 10. The measurement result is transmitted to an external device such as a PC that is communicably connected to the main body 10 and displayed on the display unit of the external device or printed by a printer connected to the external device. Can be output.

It is a schematic block diagram which shows one Example of the measuring apparatus which concerns on this invention. It is a flowchart which shows one Example of the data table setting method which concerns on this invention. It is a flowchart which shows the other Example of the data table setting method based on this invention. It is a schematic block diagram of other Examples of the measuring device concerning the present invention.

Explanation of symbols

1 Measuring device (pH measuring device, electrical conductivity measuring device)
2 USB memory (removable storage means, information transmission medium)
3 LAN cable (communication means, information transmission medium)
4 Personal computer (external device)
10 body 12 ROM (first storage means)
13 RAM (second storage means)
14 1st interface part (reading / writing means)
15 Second interface unit (reception / transmission means)
20 Measuring part (pH composite electrode, conductivity cell)

Claims (15)

A pH measuring electrode that outputs a signal corresponding to the pH value of the solution;
Temperature detecting means for outputting a signal corresponding to the temperature of the solution;
A body to which the pH measurement electrode and the temperature detection means are connected;
Storage means for storing a pH-temperature characteristic data table provided in the main body and indicating the relationship between pH and temperature of the standard solution;
A signal processing unit provided in the main body, taking out a pH value corresponding to a signal output from the temperature detection unit according to the temperature of the standard solution from the storage unit, and performing calibration using the pH value;
The pH-temperature characteristic data stored in the storage means and the fetch means for taking in the pH-temperature characteristic data table stored in the storage means provided in the main body from an information transmission medium outside the main body. At least one of output means for outputting the table to an information transmission medium outside the main body;
A measuring apparatus comprising: An electrical conductivity measurement electrode that outputs a signal corresponding to the electrical conductivity of the solution;
Temperature detecting means for outputting a signal corresponding to the temperature of the solution;
A body to which the electrical conductivity measuring electrode and the temperature detecting means are connected;
A storage unit that is provided in the main body and stores a temperature coefficient-temperature characteristic data table indicating a relationship between temperature and temperature coefficient representing temperature dependence of electrical conductivity;
A signal processing unit provided in the main body, which takes out a temperature coefficient value corresponding to a signal output from the temperature detection unit from the storage unit, and performs temperature compensation of a measured value of electrical conductivity using the temperature coefficient value; ,
The temperature coefficient-temperature characteristic stored in the storage means, and the temperature coefficient-temperature characteristic data table stored in the storage means provided in the main body, and the temperature coefficient-temperature characteristic stored in the storage means At least one of output means for outputting a data table to an information transmission medium external to the main body;
A measuring apparatus comprising: An electrical conductivity measurement electrode that outputs a signal corresponding to the electrical conductivity of the solution;
A body to which the electrical conductivity measurement electrode is connected;
A storage means provided in the main body for storing an electrical conductivity-concentration conversion data table indicating a relationship between electrical conductivity and concentration;
A signal processing means provided in the main body, taking out a concentration value corresponding to a signal output from the electrical conductivity measuring electrode from the storage means, and converting the measured electrical conductivity value into a measured concentration value;
The electric conductivity-concentration conversion data table stored in the storage means provided in the main body is fetched from an information transmission medium external to the main body, and the electric conductivity stored in the storage means -At least one of output means for outputting a density conversion data table to an information transmission medium outside the main body;
A measuring apparatus comprising:   The information transmission medium is storage means detachably connected to the main body, and the capturing means is reading means for reading information from the removable storage means. The measuring device according to any one of the items.   The information transmission medium is a communication unit that communicatively connects a device external to the main unit and the main unit, and the capturing unit is a receiving unit that receives information transmitted through the communication unit. The measuring device according to any one of claims 1 to 3.   The information transmission medium is storage means detachably connected to the main body, and the output means is writing means for writing information to the removable storage means. The measuring device according to any one of the items.   The information transmission medium is a communication unit that communicatively connects a device external to the main unit and the main unit, and the output unit is a transmission unit that transmits information to the device through the communication unit. The measuring device according to any one of claims 1 to 3. A pH-temperature characteristic data table showing the relationship between the pH and temperature of the standard solution used in the measuring device, a temperature coefficient-temperature characteristic data table showing the relationship between the temperature coefficient representing the temperature dependence of the electrical conductivity and the temperature, Or a method of setting a data table which is an electrical conductivity-concentration conversion data table showing the relationship between electrical conductivity and concentration,
Inputting the data table using equipment external to the measuring device;
Transmitting the input data table via an information transmission medium;
Taking the transmitted data table into the measuring device;
Storing the captured data table in storage means provided in the measuring device;
A data table setting method characterized by comprising:   The transmitting step includes storing the input data table in a storage unit removable from the device by a writing unit provided in the device, and the capturing step is removed from the device and 9. The data table setting method according to claim 8, further comprising: reading a data table stored in the removable storage unit connected to a measuring device by a reading unit provided in the measuring device. .   The step of transmitting includes transmitting the input data table by a transmission unit provided in the device through a communication unit that communicatively connects the device and the measuring device, and the step of capturing the data table 9. The data table setting method according to claim 8, further comprising: receiving a data table transmitted through the communication unit by a receiving unit provided in the measurement apparatus.   The data table setting method according to any one of claims 8 to 10, wherein the device is a personal computer. A pH-temperature characteristic data table showing the relationship between the pH and temperature of the standard solution used in the measuring device, a temperature coefficient-temperature characteristic data table showing the relationship between the temperature coefficient representing the temperature dependence of the electrical conductivity and the temperature, Or a method of setting a data table which is an electrical conductivity-concentration conversion data table showing the relationship between electrical conductivity and concentration,
Storing the data table in a storage means provided in the measuring device;
Transmitting the stored data table via an information transmission medium;
Taking the transmitted data table into a device external to the measuring device;
Storing the captured data table in storage means provided in the device;
A data table setting method characterized by comprising:   The step of transmitting includes storing the data table stored in the storage unit in the measurement apparatus in the storage unit removable from the measurement apparatus by a writing unit provided in the measurement apparatus, and capturing the data table. The step includes reading a data table stored in the removable storage unit connected to the device by being detached from the measuring device by a reading unit provided in the device. 12. The data table setting method according to 12.   In the transmitting step, the data table stored in the storage unit in the measurement apparatus is transmitted by the transmission unit provided in the measurement apparatus through the communication unit that connects the measurement apparatus and the device so that they can communicate with each other. 13. The data table setting according to claim 12, wherein the capturing step includes receiving a data table transmitted through the communication unit by a receiving unit provided in the device. Method.   The measurement method according to claim 12, wherein the device is a second measurement device or a personal computer different from the measurement device.

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