JPH03261854A - Apparatus for judging quality of oxidation-reduction electrode - Google Patents

Abstract

PURPOSE:To easily judge the quality of an ORP electrode by reading the change characteristic data table of oxidation-reduction potential to the temp. change of a check solution used at the beginning and calculating the tolerance range of the potential corresponding to the measured temp. of the solution to judge whether the measured potential is within the tolerance range. CONSTITUTION:Machinery is initialized at first and potential data and temp. data are taken in from an ORP electrode and calculated to obtain necessary data. Next, it is judged whether electrode checking operation is indicated and, when there is indication, it is judged whether a check solution is an iron solution and, in the case of the iron solution, the tolerance range of potential at the present measured temp. is calculated on the basis of the characteristic table of the iron solution and, in the case of a quinhydron solution, the same processing is applied thereto. When the potential is within the tolerance range, an electrode is judged to be fine and when the potential is out of the tolerance range, the electrode is judged to be inferior and this judgement result is displayed on a display part or sent out to the outside as an output signal.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for determining the quality of a redox electrode, and more particularly to a device that automatically determines the quality of a redox electrode.

<Conventional technology> Conventionally, when determining the quality of an oxidation-reduction electrode (hereinafter abbreviated as ORP electrode), the ORP electrode that is the target of the determination, which is installed in the equipment, is exposed to iron solution or quinhydrone as shown in the characteristic diagram in Figure 3. The device is immersed in a check liquid whose oxidation-reduction potential changes with respect to temperature changes, such as a solution, and the measured value of the oxidation-reduction potential of the check liquid is displayed on the display of the device, and the temperature of the check liquid in that state is displayed. The oxidation-reduction potential corresponding to the measured temperature is measured by the temperature measuring means and determined from the above-mentioned characteristic diagram, and the measured value of the oxidation-reduction potential of the check liquid by the ORP electrode that is the subject of judgment is the check liquid determined from the above-mentioned characteristic diagram. Acceptance or failure is determined based on whether the redox potential corresponding to the measured temperature is within an allowable range.

<Problems to be Solved by the Invention> However, in determining the acceptability of such conventional ORP electrodes, it is necessary to use a temperature measuring means for measuring the temperature of the check liquid and a characteristic diagram of changes in oxidation-reduction potential with respect to temperature changes of the check liquid. (Table) must be prepared and the permissible range of redox potential at the temperature of the check liquid must be read from the change characteristic diagram (Table), which poses a problem that requires a considerable amount of work time for the operator.

The present invention has been made in view of these points, and its purpose is to provide a novel redox electrode quality determination device that can significantly reduce the operator's working time.

Means for Solving the Problems> The present invention that solves the above problems includes: a check liquid whose change characteristics of redox potential with respect to temperature changes are clear; and a data table of change characteristics of redox potential with respect to temperature changes of a plurality of check liquids. a first memory storing temperature measurement data and potential measurement data of the check liquid by the oxidation-reduction electrode; and a change characteristic data table corresponding to the measurement check liquid from the first memory. a check liquid specifying unit that specifies a check liquid to be read; and a calculation unit that calculates an allowable potential value corresponding to the temperature measurement data stored in the second memory based on the read change characteristic data table; Comparing means for comparing the calculation result of the calculation means with the potential measurement data stored in the second memory, and a display section for displaying the quality of the redox electrode according to the comparison result of the comparison means. This is a characteristic feature.

Function> In the redox electrode quality determination device of the present invention, the operator only needs to immerse the ORP electrode to be checked in a desired check liquid and specify the check liquid in which the ORP electrode is immersed.

That is, the device first reads out the data table of the change characteristics of the oxidation-reduction potential with respect to the temperature change of the check liquid being used, calculates the allowable range of the potential according to the measured temperature of the check liquid, and then calculates the potential range to be measured. It is compared whether or not it is within the calculated tolerance range, and the quality of the ORP electrode to be checked is displayed on the display section according to the comparison result. Such a series of processing sequences are automatically executed.

This can significantly reduce the operator's work time in determining the quality of the ORP electrode.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, an ORP electrode 1 to be checked is immersed in a check liquid 2 such as an iron solution or a quinhydrone solution whose change characteristics of redox potential with respect to temperature changes are clear. The OR
The P electrode 1 is also provided with a temperature sensor. The temperature measurement signal and the redox potential measurement signal outputted from the ORP electrode 1 are selectively input to the A/D converter 4 via the multiplexer 3, and converted into digital signals. It is manually operated by the processing section 5.

The temperature and potential measurement data that were converted into digital signals and manually entered into the central processing unit 5 were subjected to the calculation processing necessary to obtain potential (mV) data and temperature data in the internal calculation means 6. Thereafter, the measured data is temporarily stored in the measurement data memory 7. A check liquid characteristic table memory 8 connected to the central processing unit 5 stores characteristic data as shown in FIG. The corresponding table is stored. Among the check liquid characteristic tables stored in the check liquid characteristic table memory 8, those of the check liquid in use are selected according to the designation signal inputted by the check performance designation section 9, and read out to the calculation means 6. Calculating means 6 calculates an allowable potential range at the current measurement temperature based on the temperature data read from the measurement data memory 7 and the check liquid characteristic table read from the check liquid characteristic table memory 8, and compares the results.] Manpower to 0. The comparison means 10 compares whether the potential data read from the measurement data memory 7 is within the allowable range of the potential calculated by the calculation means 6, and determines the quality of the ORP electrode 1 to be checked. The results of the determination of the quality of the ORP electrode 1 to be checked by the comparing means 10 are displayed on the display section 11. In addition, ORP
The check operation sequence of the electrode 1 is automatically executed by inputting an operation start command signal from the check operation start instruction section 12 to the central processing section 5 .

FIG. 2 is a flowchart illustrating such an ORP electrode checking operation.

Finally, the device is initialized (step 1).

Subsequently, potential data and temperature data are fetched from the ORP electrode 1 (step 2), and calculation processing is performed to obtain necessary data from these fetched data (step 3). Thereafter, it is determined whether or not there is an instruction to check the electrode (step 4), and if there is no instruction to check the electrode, the processes from step 2 onwards are repeated. If an instruction to check the electrode is given, it is determined whether the liquid is a check liquid or an iron solution (step 5). If an iron solution is specified as the check liquid, calculate the allowable potential range at the current measurement temperature based on the iron solution characteristic table (Step 6); if a quinhydrone solution is specified as the check liquid, An allowable potential range at the current measurement temperature is calculated based on the characteristic table of the quinhydrone solution (step 7). Then, it is determined whether the measured potential is within the permissible range based on the permissible range of the potential calculated in Step 6 or Step 7 (Step 8). If the potential is within the permissible range, the electrode If the potential is outside the allowable range, it is determined that the electrode is ``no'' (step 10). These determination results are displayed on the display section or outputted to the outside as an output signal (step 11). Thereafter, the processing from step 2 onwards is repeatedly executed.

With this configuration, there is no need for a thermometer other than the check electrode and a characteristic table for checking, which were conventionally required, and the operator's work procedure is greatly simplified and the work time is shortened.

By using an electrically erasable and writable EEPROM as a check performance characteristic memory, it is also possible to write characteristic data of any check liquid other than the above-mentioned iron solution or quinhydrone solution.
By writing characteristic data into M, it is also possible to check with any check liquid.

<Effects of the Invention> As described above in detail, according to the present invention, it is possible to provide a novel redox electrode quality determination device that can significantly reduce the operator's working time.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
Flowchart 3 for explaining the operation shown in FIG. 3 is a characteristic diagram of changes in redox potential with respect to temperature changes during the night of the check. 1... Redox electrode (ORP electrode) 2... Check l night 3... Multiplexer 4... A/D converter 5... Microprocessor 6... Arithmetic means 7...
・Measurement data memory 8...Check liquid characteristic table memory 9...Check liquid specification section 10...Comparison means 11...Display section 12...Check operation start instruction section 2 Temperature (oC)

Claims (1)

[Scope of Claims] A check liquid whose change characteristics of redox potential with respect to temperature change are clear; a first memory storing a data table of change characteristics of redox potential with respect to temperature change of a plurality of check liquids; a second memory for storing temperature measurement data and potential measurement data of the check liquid by the electrode; and a check liquid specifying section for specifying the check liquid so as to read out a change characteristic data table corresponding to the measurement check liquid from the first memory. and, based on the read change characteristic data table, the second
a calculation means for calculating an allowable potential value corresponding to the temperature measurement data stored in the second memory; a comparison means for comparing the calculation result of the calculation means with the potential measurement data stored in the second memory; A redox electrode quality determination device comprising: a display section that displays the quality of the redox electrode according to the comparison result of the comparison means.