JPH0527495Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cathodic protection monitoring device that unmannedly monitors the cathodic protection status of a buried structure that is an object of cathodic protection.

[Conventional technology]

In order to monitor the cathodic protection status of buried structures, it is necessary to record the cathodic protection management data of the buried structures, but the conventional method of recording cathodic protection management data is to continuously record paper using a voltage recorder. There are those that record waveforms on the ground, and those that record the highest potential with a needle-type voltmeter.

[The problem that the idea aims to solve]

Among the above conventional techniques, the former requires a worker to be assigned to manage the recorder to monitor the instrument such as replacing recording paper and pens and running out of ink. and
There was a problem that the corrosion protection status could not be grasped.

The present invention was devised to solve the above-mentioned problems in the conventional technology, and the technical problem is to compare and store the necessary corrosion protection management data for each item, and it can be used for both short and long periods of time. The purpose is to achieve unattended and accurate monitoring of cathodic protection conditions even during periods.

[Means to solve the problem]

The means of the present invention for solving the above-mentioned technical problems is to connect a potential detection terminal in a cathodic protection device to which a buried structure and a reference electrode are connected via an A/D converter.
Connecting the CPU, to this CPU, a reference electrode switcher that sets a conversion value according to the type of reference electrode used for potential detection, an LCD screen that displays the data stored in the CPU, and a Connecting a printer that prints out stored data, a reset switch that clears the memory contents of the CPU, and a clock that outputs time information, and checking the maximum and minimum values of the potential information input to the CPU. ,
The current value and the time of occurrence are stored while being compared and verified with the old stored data, and the present invention has a function of storing the frequency of potentials outside of an arbitrarily set corrosion control control reference potential range.

[Effect]

The CPU is digitized by an A/D converter.
A potential value signal, which is the potential difference between the buried structure and the reference electrode, is inputted at regular time intervals using a scat, and this potential value is converted using the conversion value set with the reference electrode switch, and the maximum value already stored or It is compared with the minimum value, and if it is larger or smaller than the maximum or minimum value, this new potential value is stored as the maximum or minimum value instead of the previously stored maximum or minimum value. At this time, the date information at that point is taken in from the clock using the same scan, and this information is stored together.

The input potential value is stored together with the date information until the next scan is performed, regardless of whether this potential value becomes the maximum value or the minimum value.

Further, the input potential value is compared with a preset corrosion prevention control reference potential range, and if it is outside this range, it is added to the accumulated number of times and stored.

The data stored in this CPU, namely the maximum potential value, minimum potential value, current potential value, time of occurrence of each value, and the number of times the potential exceeded the corrosion control control standard potential range, can be displayed as is in a table on the LCD screen. , allowing inspectors who regularly patrol the area to grasp the cathodic protection status of buried structures at a glance.

The printer prints out the data stored in the CPU, that is, the data displayed on the liquid crystal screen, and prints out the stored data as needed. That is, it may be carried out when the inspector deems it necessary, or it may be carried out at fixed time intervals so that the status of cathodic protection can be grasped continuously.

Once the data stored on the LCD screen and printer have been checked, operate the reset switch to clear the contents of the CPU and start a new measurement from this point on.

In this way, by knowing the maximum and minimum values of the corrosion protection potential over a desired period of time and the frequency with which the potential deviates from the set corrosion protection control reference potential range,
It is possible to understand the influence of stray currents, that is, the corrosion protection environment, and also to know the operating status of the cathodic protection equipment, as well as the corrosion protection status of the buried structure itself, making it possible to monitor the cathodic protection of buried structures. can be achieved unattended, reliably and suitably.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Of the pair of potential detection terminals 4 and 5 of the cathodic protection device 3, one of the potential detection terminals 4 connected to the buried structure 1 is connected to the cathode protection monitoring device 6 of the present invention built in the cathode protection device 3. A cathodic protection monitoring device is connected to the other potential detection terminal 5, which is connected to the positive side of a pair of lead wires 12 forming an input terminal, and is also connected to the reference electrode 2 for potential measurement placed near the buried structure 1. Connect the negative sides of the pair of lead wires 12 of 6.

This lead wire 12 is connected to an A/D converter 8 connected to a CPU 9 which is the main part of the cathodic protection monitoring device 6, and the CPU 9 has a clock 7, an LCD screen 10, a printer 11, and a reset switch. 13 and a reference electrode switch 14, and the clock 7 is also connected to a liquid crystal screen 10, so that the current time (year, month, day, hour, minute, second) is displayed on the screen.

If the cathodic protection device 3 has a power source, the power source 15 of the cathodic protection monitoring device 6 is connected to this power source (AC
100V or 200V), and if the cathodic protection device 3 does not have a power source, it is better to use a combination of solar cells and storage batteries.

Potential data as a potential difference signal appearing at the potential detection terminals 4 and 5 is digitized by an A/D converter 8 and then input to the CPU 9.

The CPU 9 takes in this potential data by scanning at regular time intervals, but since this taken in potential data is a value based on the reference electrode 2 being used, this value is saturated by the reference electrode switch 14. Conversion is performed according to the conversion value set to convert to a value based on the copper sulfate electrode.
For example, when the reference electrode 2 is made of zinc, in order to convert to the saturated copper sulfate standard, a converted value of -1150 mV is added to the input potential data.

At the same time as converting this imported data, the clock 7
The time data from 2008 is taken in, and the data is matched with the time at which it was taken in to form the corrosion protection management data to be stored.

This corrosion protection management data is stored as it is as the current potential value, and is also compared with the already stored maximum potential value or minimum potential value, and if it exceeds this, the existing data is deleted and a new maximum potential value is created. It is stored as a value or minimum potential value, and is checked against the corrosion prevention control reference potential range that is set in advance as the appropriate corrosion protection potential range, and if it falls outside of this range, it is counted as data on the frequency of deviations from this corrosion protection control reference potential range. 1 is counted and accumulated and stored.

The CPU 9 creates corrosion protection management data, compares and updates the maximum potential value and minimum potential value, and checks the corrosion protection management reference potential range for each scan, and the current potential value is be replaced by something new.

The corrosion protection management data stored in the CPU 9 for each scan is displayed as is on the liquid crystal screen 10, so that it is always available for inspection by inspectors.

The printer 11 records the corrosion protection management data stored in the CPU 9, and its usage depends on the importance of the buried structure 1, the frequency of inspection by inspectors, and the memory provided integrally in the CPU 9. The decision can be made depending on the capacity, etc., and if the inspector is making frequent rounds, the inspector should print out the printout at his or her discretion. If the length is long, it is best to print it out automatically at regular intervals.

When the inspector has finished checking the corrosion protection management data and collecting the corrosion protection management data and wants to start a new measurement, press the reset switch 13 to clear the data stored in the CPU 9 and start a new measurement from that time. Let it start.

[Effect of idea]

Since the present invention has the above-described configuration, it has the following effects.

Maximum potential value automatically measured and stored unattended,
From the minimum potential value, current potential value, and corrosion protection management data of the frequency of deviations from the set corrosion protection control standard potential range, the electrolytic protection environment of the place where the buried structure is buried,
The operational status of the cathodic protection device itself and the cathodic protection status of the buried structure itself can be accurately known, and highly reliable and stable monitoring of the buried structure can be achieved unattended.

Since the cathodic protection monitoring device of the present invention is simply built into each cathodic protection device, it can be easily and inexpensively implemented for cathodic protection equipment that has a cathodic protection device, regardless of whether it is existing or newly installed. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of an embodiment of the present invention connected and assembled to a cathodic protection device. Explanation of symbols, 1... Buried structure, 2... Reference electrode, 3... Cathodic protection device, 4... Potential detection terminal,
5... Potential detection terminal, 6... Cathodic protection monitoring device,
7...Clock, 8...A/D converter, 9...CPU,
10...LCD screen, 11...Printer, 12...
...Lead wire, 13...Reset switch, 14...
...Reference electrode switch, 15...Power supply.

Claims (1)

[Scope of utility model registration request] At the potential detection terminal in the cathodic protection device, where the buried structure that is the cathodic protection object and the reference electrode are connected,
A reference electrode switcher that sets a converted value according to the type of reference electrode used for potential detection, connected to the CPU via an A/D converter, and a liquid crystal screen that displays the data stored in the CPU. and said CPU
A printer that prints out data stored in the CPU, a reset switch that clears the memory contents of the CPU, and a clock that outputs time information are connected to each other, and the maximum value of the input potential information to the CPU is It is characterized by having a function of storing the minimum value, current value, and occurrence time while comparing and checking with old stored data, as well as storing the frequency of potentials outside the arbitrarily set corrosion control control reference potential range. Cathodic protection monitoring equipment.