JP6537794B2 - Measuring device - Google Patents

Description

  The present invention relates to a potentiometric automatic titration apparatus, and more particularly to a measuring apparatus in which a measuring electrode is provided with storage means.

  In a measuring device such as a pH meter or an ion meter equipped with a measuring electrode that is detachable from the main body of the device, the characteristics of each electrode are calibrated using a standard solution before use, and measurement is performed based on this calibration data The values are calculated and displayed.

  Therefore, as described above, in the conventional measuring device, since the data calibrated when using the electrode is stored in the memory in the device body, when replacing the electrode with another electrode, Calibration should be performed again using the standard solution for the new electrode.

  Some measurement devices store some calibration values, and can select and use appropriate values from the multiple values, but if the user remembers which data belongs to which electrode It does not. That is, the device body could not automatically identify the electrode.

  In order to solve the problems as described above, in Japanese Patent No. 3828903, an electrode is provided with storage means for storing calibration data of the electrode, and before measurement, calibration data of the storage means on the device side and the electrode side A measuring device is disclosed that starts measurement after matching the calibration data stored by the storage means. Japanese Patent No. 4167274 discloses that the electrode deterioration information is handled by the electrode storage means.

Patent No. 3828903 Patent No. 4167274

  However, in the configurations disclosed in the above two conventional patent documents, since the electrode and the storage means on the electrode side are integral and indivisible, when the electrode is broken or deteriorated, both the electrode and the storage means attached thereto are simultaneously replaced. It is necessary to dispose of the storage means, which is necessary, economically disadvantageous, and not damaged.

  The present invention has been proposed in view of the above-described conventional circumstances, and an object of the present invention is to provide a measurement device that can be replaced with only replacement of an electrode even if the electrode is damaged or deteriorated.

  The present invention is premised on a measuring device including a device main body and a measurement electrode connected to the device main body by a measurement signal cable, wherein the measurement signal cable is detachable from both the device main body and the measurement electrode. It consists of the following external storage means, calibration processing means, and measurement processing means.

  An external storage means is located outside the device body and is physically inseparable from the measurement signal cable. The calibration processing means is placed inside the device body, generates calibration data based on the value obtained from the measurement signal cable at the time of calibration of the measurement electrode, and stores it in the external storage means. Furthermore, the measurement processing means is placed inside the device body, and generates measurement data based on the calibration data stored in the external storage means at the time of measurement and the value obtained from the measurement signal cable. There is. Further, by pasting the seal 60 across the electrode 10 and the measurement signal cable 20, the correspondence between the electrode and the measurement signal cable is secured.

  In the above configuration, since the storage means is inseparable from the measurement signal cable, when the electrode is deteriorated or damaged, only the electrode needs to be replaced, and the measurement signal cable and the external storage means continue to the new electrode replaced. It can be used.

It is a figure showing an outline of the present invention. It is a functional block diagram by the side of a main part.

  FIG. 1 is a view showing an outline of the present invention, and FIG. 2 is a functional block diagram of a main body side. 1 and 2 show the case where the present invention is applied to a pH titrator.

  A potentiometric titrator such as a pH titrator processes the electrode 10 and the value received from the electrode via the measurement signal cable 20 to generate measurement data, and displays and displays the measurement data from the device main body 30 Become.

  One end of the measurement signal cable 20 can be detachably connected to the measurement electrode 10, and the other end of the measurement signal cable 20 can be connected to a predetermined connector 301 of the apparatus main body 30. In the measurement signal cable 20, a storage means 40 is fixed in a physically indivisible state, and the storage means 40 is provided with a data cable 50 connectable to the main body so that it can be connected to a predetermined connector 302 on the main body side. It has become. The “physically indivisible state” may be considered to physically integrate the measurement signal cable 20 and the data cable 50, for example, as shown in FIG.

  In the apparatus body 30, calibration processing means 31, measurement processing means 32, and initial processing means 34 described below are provided. The functions of the calibration processing means 31 and the measurement processing means 32 will be made clearer while describing the procedure of calibration and the procedure of measurement below.

<Electrode that needs calibration information>
(Initial use)
First, one end of the measurement signal cable 20 provided with the external storage means 40 is connected to the electrode 10 (here, a pH electrode) to be used, and the other end is connected to the connector 301 of the apparatus main body 30. Furthermore, the data cable 50 extended from the external storage means 40 is connected to the connector 302 of the apparatus main body 30.

  When the connection is completed, the initial processing means 34 of the apparatus main body 30 carries out the initialization work of the external storage means 40, and additionally, the serial number of the electrode, the type of electrode and the type of electrode (hereinafter referred to as electrode information) The external storage means 40 and the memory 35 in the apparatus main body 30 are registered.

  The measurement electrode 10 is calibrated by the calibration processing means 31 in the apparatus main body 30 using a pH standard solution (for example, standard solutions of pH 7 and pH 4). When calibration is performed, the calibration processing means 31 causes the external storage means 40 to carry out the first calibration day, the calibration value (pH 7 and corresponding potential value, pH 4 and corresponding potential value), calibration temperature (hereinafter referred to as calibration) Record information).

  At the time of measurement, the potential obtained from the measurement electrode 10 is read by the measurement processing means 32 of the device main body 30, and the calibration information recorded in the external storage means 40 is read out, and the pH value is read based on the calibration information. Is calculated, and the necessary display or printing is performed by the display and printing unit 33.

(After the second time)
Since the pH electrode is affected by the environment such as temperature and humidity, it is necessary to perform calibration periodically. Therefore, in the case of the calibration process again, the measurement signal cable 20, the electrode 10 and the apparatus main body 30 are connected as described above, but at this time the initial processing means 34 writes the previous calibration information in the external storage means 40. Check if it is.

  Here, if it has been written, the measurement electrode 10 is calibrated using the calibration processing means 31 using a pH standard solution (for example, standard solutions of pH 7 and pH 4). When the calibration is completed, the calibration processing means 31 causes the external storage means 40 to store calibration date, calibration value (pH 7 and corresponding potential value, pH 4 and corresponding potential value), calibration data such as temperature at calibration, etc. Record Here, the previous calibration data is updated with the new calibration data, but the first calibration date is left as it is.

  As in the previous time, when performing the measurement, the value of pH is calculated by the measurement processing means 32 based on the potential obtained from the measurement electrode 10 and the calibration information recorded in the external storage means 40, and the display printing means Display or print at 33.

  In the above, when the previous calibration information is not written, it means the first use, and the step of the initial use is performed.

(Expiration date)
The first calibration date recorded in the external storage means 40 is read out for each calibration process, and the period from the first calibration to the present is calculated. When the period exceeds the expiration date information (for example, one year) stored in the memory 35 of the device main body 30, it is displayed on the device main body that it is the exchange deadline of the measurement electrode. When the time limit has passed or when the measurement electrode is broken, the measurement electrode 10 is removed from the measurement signal cable 20, replaced with a new measurement electrode, and calibration is performed again.

<Electrode that does not require calibration information>
The present invention is applicable not only to electrodes that require calibration, but also to electrodes that do not require calibration.

  Similarly to the above, one end of the signal electrode cable 20 is connected to the measurement electrode 10 to be used, and the other end is connected to the device body 30. Next, the initial processing means 34 of the device body 30 carries out the initialization work of the external storage means 40, and the serial number of the electrode, the type of electrode, the type of electrode, the use start date, the memory 35 in the device body 30, It is stored in the external storage means 40.

  Prior to the start of each subsequent measurement operation, the device body 30 uses the start date information recorded in the external storage means 40 with respect to the use period information (for example, one year) set in the memory 35 inside the device body 30 And the date of the device main body is collated, and when the time limit has come, it is displayed on the device main body that it is the electrode replacement due date.

  According to the above indication, or when the measurement electrode is broken, the measurement electrode 10 is removed from the measurement signal cable 20 and replaced with a new measurement electrode 10. Perform initial registration again.

  In the present application, the electrode 10 and the measurement signal cable 20 are detachable. Therefore, the calibration information is established only when the specific electrode 10 and the specific measurement signal cable 20 correspond to each other 1: 1. In order to establish this correspondence, it is not necessary to peel off the connection portion between the electrode 10 and the measurement signal cable 20 normally, but a seal 60 which can be peeled off purposefully straddling the electrode 10 and the measurement signal cable 20 paste. Various other aspects can be considered for the configuration of the relationship holding means for securing the correspondence between the specific electrode 10 and the specific measurement signal cable 20.

  As described above, according to the present invention, even if the electrode is damaged or aged, it can be replaced with a commercially available electrode, and the apparatus becomes inexpensive.

10 Measurement Electrode 20 Measurement Signal Cable 30 Device Body 31 Calibration Processing Means 32 Measurement Processing Means 33 Display Printing Means 34 Initial Processing Means 35 Memory 40 External Storage Means 50 Data Cable

Claims (1)

A measuring apparatus comprising: an apparatus main body; and a measurement electrode connected to the apparatus main body by a measurement signal cable, wherein the measurement signal cable is attachable to and detachable from both the apparatus main body and the measurement electrode.
An external storage means located outside the device body and physically indivisible into the measurement cable;
Calibration processing means placed inside the apparatus main body, which generates calibration data based on data obtained from the measurement signal cable at the time of calibration of the measurement electrode, and stores it in the external storage means ;
Measurement processing means placed inside the apparatus main body that generates measurement data based on calibration data stored in the external storage means at the time of measurement and data obtained from the measurement signal cable;
A seal which is attached across the measurement electrode and the measurement signal cable to a connection portion of a specific measurement electrode and a specific measurement signal cable, and which does not usually need to be peeled off, but which can be peeled off intentionally;
The measuring device characterized by having.

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