Measuring the parameters of corrosion

 

Meter refers to non-destructive testing of objects and can be used for measuring the parameters of the corrosion process of metals in a conductive liquid medium in order to diagnose the state of technological equipment and pipelines. The device contains a sensor-probe, the preprocessing block signals, multichannel analog-to-digital Converter, a microprocessor, non-volatile memory module, LCD display, keyboard, real time clock, heating element and temperature sensor. The case of the device hosting the functional blocks and elements placed in a sealed protective box. Non-volatile memory module are removable with the ability to connect to the device from the outside of the hull. The technical result of this technical solution is to expand the functional capabilities of the device and increase the temperature range at which it can work. 4 C.p. f-crystals, 3 ill.

The invention relates to non-destructive testing of objects and can be used for measuring the parameters of the corrosion process of metals in a conductive liquid medium for the purpose of diagnosis with the fir conductive environments, for example oil.

The prior art.

From the patent literature known device containing the measuring electrodes, the current leads are connected to the processing unit, and a control connected to the indicator unit, such as a Device for quality control of anti-corrosion coatings on the inner surface of pipelines" (AB. St. SU 1509710 A1, 4 G 01 N 27/20, priority 29.06.87, publ. 23.09.89), "Device for non-destructive quality control of the pipe walls" (patent RU 2037815 C1, 6 G 01 N 27/20, 27/00, priority 21.12.90, publ. 19.06.95).

One of the analogues of the claimed device is an Electrochemical analyzer physico-chemical properties of materials" (patent RU 2112965 C1, 6 G 01 N 27/00, 27/20, priority 10.10.97, publ. 10.06.98) containing a power source, a processing unit and control panel input programs of study at the input and indicator unit output, as well as measuring electrodes connected to the processing unit and the control.

The device is similar allows to reduce the analysis time, diagnose the condition and the possibility of failure to predict resource is operated equipment.

Another analogue of the claimed technical solution is "Portacaval physical quantity into an electrical signal, cable is connected to the electronic block of preliminary signal processing, including the power source, a multiplexer, an analog-to-digital Converter and a microprocessor, including a controller, real time clock, and a storage device.

The electronic unit preliminary data processing is performed in a separate housing and can operate independently of the final signal processing (computer). The power source in the form of one or more battery saving measured data in the storage device. The disadvantage of this analog is a limited resource of continuous operation without replacement of the battery.

The closest in technical essence, i.e., the prototype is the device described in the invention "Method for detecting mechanical quantity and Registrar for implementing the method" (patent RU 2189565 C2, IPC 7 G 01 D 9/00, priority, 30.10.2000, publ. 20.09.2002).

Common features of the prototype (Registrar mechanical values) and the claimed device (meter parameters of corrosion is the presence of the sensor - sensing device of the measured value into an electrical signal (in the present device the sensor is the primary Preobrazovatel, power supply, temperature sensor amplifiers (in the inventive device, the pre-signal processing), a multiplexer, an analog-to-digital Converter (ADC), a microprocessor, including a controller, a random access memory (RAM) and the real time clock; an electrically programmable non-volatile mass storage device (in the present meter non-volatile memory module), as well as the body in which interconnected functional blocks. The output of the amplifier-shaper is connected to the multiplexer input.

The disadvantage of the prototype is limited functionality due to the fact that the Registrar has no functional completeness, as it pre accumulates the measured data, namely mechanical value, time ad hoc loads and temperature. Then when connecting via remote data collection system final signal processing (computer), transferred the measurements are processed by a special program and displayed on the display screen or the printer in the form of the final result. In addition, the record in the Registrar required for the operating mode of the Registrar and the other is a system for final processing signals via the portable remote data collection, therefore, the Registrar must be operated together with the entire system.

Another disadvantage of the prototype is a limited resource work without replacing the batteries, although longer work, due to the power saving is achieved by reducing the particular write data to RAM through their initial analysis and discarding uninformative signals, which are mechanical noise and are not recorded by the Registrar, as well as reducing the sampling frequency of the ADC.

In addition, APASU allows long-term to save the measured data without consuming electric power.

The essence of the invention.

The task, which directed the inventive device consists of: a) the extension of functional capabilities; b) to increase battery life without replacement batteries; C) increase the temperature range at which the device can work.

The technical result achieved by the invention is: a) the extension of functionality through the implementation of several measurement modes (manual and Autonomous), display of measurement results, control the measurement process by operational izmenenenie electrodes, by changing the time interval between measurements Semitism and changes to a temporary pause before starting the measurement Sci by providing continuous monitoring by overwriting the measurement results from the RAM of the microprocessor in the removable non-volatile memory module and replace it with a new one; b) increasing the period of Autonomous operation without replacement of the battery by reducing power consumption at the expense of dispatching power (distributed power supply system) and the introduction of "sleep" mode when function blocks are only active during the time interval of each measurement, and in the intervals between the measurements automatically and through the use of non-volatile memory module; the increase of the temperature range at which the device can work due to temperature and heating required for liquid crystal display and placing the electronic part of the device in a sealed box for protection from the influences of the external environment.

To achieve a technical result in the meter parameters of corrosion that contains the sensor - transducer informative values into electrical signals, the non-volatile memory module and located in the housing of the source is showing connected to the input multi-channel analog-to-digital Converter (MACP), including the multiplexer and the ADC; and a microprocessor that includes the controller RAM and real time clock, according to the invention provides the following: it is additionally placed in the housing of the second electrical connector, controller, power supply, keyboard, LCD display, real time clock and the heating element, and a microprocessor connected to the relevant one-way links with the pre-signal processing, liquid crystal display, and the relevant bilateral ties with MACP, keyboard, real time clock, temperature sensor, controller, power supply and a first electrical connector that their information outputs are connected in parallel to the digital outputs MACP, the second electrical connector bilateral ties connected to the preprocessing block signals, the controller power his three control outputs respectively connected to the first electrical connector, the heating element and the preprocessing block signals together with liquid crystal display, a power source connected to the respective power supply inputs temperature sensor, h is connected bilateral ties to the first electrical connector, and the body placed in it functional blocks and elements placed in a sealed protective box, equipped with the third electrical connector inputs connected via cable with sensor - primary Converter informative values into electrical signals, and outputs through the cable inside the box, with the second electrical connector.

Primary Converter informative quantities into electrical signals in the form of a probe that includes two electrodes of the sensor connected to the cable.

The body contains two electrical connector mounted on its front side, and the front panel, which is the keyboard and the display liquid crystal display, and the temperature sensor and the heating element is placed near the display and have him thermal coupling.

Sealed protective box made of material of high strength, such as polystyrene, and consists of a cover and a base with an electrical connector on its front side, connected to a cable that provides a connection to the second electrical connector housing, and has a filler of a material with low thermal conductivity, for example of foam material the unit in a suspended state.

Non-volatile memory module are removable with the ability to connect to the first electrical connector with the outside of the hull.

New distinctive functional blocks and elements of the claimed device: controller power supply, keyboard, LCD display, real time clock, heating element, two electrical connector, sealed protective box.

New functional blocks and elements are connected to corresponding inputs and outputs with other functional blocks and form a new distinctive connection that allows the measurement of corrosion as a function of time, namely the corrosion current Icorthe corrosion rate Vcorand real time measurements.

The controller power supply distributes power from the power source between the functional blocks cyclically supplies the power supply voltage, and after the signal processing corresponding block, turns off his power, providing a "sleep" mode, which increases the life of the device in standalone mode, without changing batteries. In addition, it monitors the voltage drop across the battery with the aim of preventing inaccurate measurement results.

Laviana the mode of the device programmable coefficients Inandand Into, conversion coefficients K and S, the editing options Semitism and Sci, as well as the current time and date. When checking availability, in the process of maintenance and calibration, to switch modes using the keyboard.

Liquid crystal display is designed for playback commands and results of measurements and results of the control battery. In the intervals between the measurements, the display is automatically turned off, saving battery power supply.

Real-time clock is required to write during the measurement, the current time and setting time intervals characterizing the measurement process.

The heating element is located near the LCD display, and together with the temperature sensor is used to create the desired temperature for its operation.

The second and third electrical connectors provide the connection of the sensor - primary Converter informative quantities into electrical signals to the measuring part of the device inside the case and protective case. In addition, the second electrical connector when connecting to the tion.

Sealed box protects the functional blocks of the device from the external environment, providing an operating temperature range from -45oC to +55oC.

The set of distinctive features of the claimed device is not detected from the patent and scientific and technical information.

The inventive device is explained in the description and drawings, in which Fig.1 shows a block diagram of the meter parameters of corrosion; Fig.2 is a block diagram of the connection of the memory module with the data processing system (computer).

In the photo (Fig.3) presents the following: a) modification of the device for operation in a laboratory environment; b) modification of the device for operation in field conditions when the meter parameters of corrosion placed in a sealed protective box; C) the unit reading data, coupled with the memory module.

In Fig.1 and 2 indicated the following:
1 - sensor-transducer informative value into an electrical signal (probe);
2 - probe cable;
3 - block;
4 - the first electrical connector;
5 - block pre-processing of signals;
6 is a multichannel analog-to-digital Converter (MACP);
7 - multiplexer;
8 - analog-to-digital Converter (Aspling time;
13 - power;
14 real - time clock;
15 - temperature sensor;
16 controller power;
17 keyboard;
18 is a liquid crystal display;
19 is a heating element;
20 - second electrical connector;
21 - non-volatile memory module;
22 - sealed protective box;
23 - the third electrical connector;
24 cable in the protective box;
25 - unit reading information (Ufa science BSI);
26 is a data processing system (computer);
27 - the interface connecting the memory module and Ufa science BSI;
28 - interface linking Ufa science BSI and the computer.

Sensor - transducer informative quantities into electrical signals (probe) 1 is connected by a cable 2 to the inputs of the third electrical connector 23 and through the cable 24 to the inputs of the second electrical connector 20 that bilateral ties are connected to the unit 5 pre-processing of signals, the output of which is connected with the respective input MACP 6, including the multiplexer 7 and the ADC 8.

The microprocessor 9 is connected to the relevant one-way links with unit 5 pre-processing of signals and liquid crystal display 18. Relevant bilateral ties, the microprocessor 9 is connected with MACP 6,civil connector 4, which their information outputs are connected in parallel digital outputs MACP 6.

Controller power supply 16 and his three control outputs respectively connected to the first electric connector 4, the heating element 19 and the block 5 of the preliminary signal processing together with the liquid crystal display 18.

The power source 13 connected to the respective power supply inputs of the sensor 15 temperature, 14 hours real time, MACP 6, the microprocessor 9 and the controller power supply 16.

Non-volatile memory module 21 is connected bilateral ties to the first electric connector 4 on the outer side of the housing 3, which provides quick removal of the memory module 21 and replace it with a new one.

The microprocessor 9 includes a controller 10, a RAM 11 and a timer 12 real-time.

RAM 11 is used to store intermediate results of indirect calculations. After their conversion in a given program, the final results of the measurements remain in the RAM 11, and then rewritten into the memory module 21.

Overwrite recorded data from the RAM 11 in the non-volatile memory module 21 allows long-term save and accumulate measurement data (data packets) without which measures 12 real-time produces clock pulses to synchronize the functional units of the microprocessor 9, ADC control 8 multiplexer 7.

The controller 10 includes a controller interface, memory programs, APASU data.

The controller interface is designed to control MACP 6 and organization of the process of transfer of measurement results in the memory module 21.

ZU programs used for storage of control programs that implement a given algorithm: measurement, calculation, display and record the measurement results in the memory module.

APASU data is intended for memorization and retention set by the operator coefficients WA, WB, K and S, time parameters of FCM and magnetism, as well as the time and date of the measurements.

The possibility of electric programming APASU data allows us to control the measurement process by quickly changing the installation factors and time intervals characterizing the measurement mode, clearing APASU data and write new information when changing measurement modes that extends the functionality of the inventive device.

The power source 13 includes two small batteries with a total nominal voltage of 3V and an Autonomous power supply functional blocks.

The supply-controller 16 determines the serial.

The first electric connector 4 is required for communication of the microprocessor 9 with the memory module 21 and switching power to the memory module 21 at the time of overwriting it.

Non-volatile memory module 21 accumulates all the results of measurements performed in manual mode if it is connected to the device, and Autonomous. Further, as the filling of the memory module 21 is disconnected from the device and perform the rewriting of the measurement results (data packets) in the computer, the data processing system 26 for further analysis.

All functional blocks and elements, in addition to the memory module 21 and the third electrical connector 23, which is placed in the housing 3, on the end side of which there are two electrical connector 4 and 20. On the front panel of the case 3 are located in the field of the keyboard 17 and the display of the liquid crystal display 18. About display 18 posted by sensor 15 temperature and the heating element 19 to control and maintain the required temperature.

In this modification of the inventive device is used to work in manual mode in the laboratory (photo, option a), the sensor (probe) 1 through the cable 2 is connected with a second electric is about equipment, for example a pipeline, the measuring device is placed in a sealed protective box 22 from a material of high strength, such as polystyrene. Protective box 22 consists of a cover and base, on the end side of which has an electric connector 23. The base and cover of the box 22 is equipped with a filler of a material with low thermal conductivity, such as a foam material or isolon. For installation in a suspended state protective box 22 has arms fixed on the perimeter of the base.

In protective box 22 place the memory module 21, which is connected to the first electric connector 4 is located on the front of the chassis 3.

The third electrical connector 23 via a cable 24 that is located between the base of the protective box 22 and filler, connect with a second electrical connector 20 of the housing 3.

The sensor (probe) 1 through the cable 2 is connected with the outer side to an electrical connector 23 of the protective box 22.

In this modification the device can be operated around the clock in stand-alone mode with stops for maintenance (photo b).

The inventive device is made of known elemental basis.

The operation of the device.) - Rev. CSOs resistance").

Indirect current measurement corrosion Icorand corrosion rate Vcorthis method is carried out by measuring the resistance RMPthe interelectrode gap of the probe by applying to the electrodes a small potential difference (usually no more than 20-30 mV) and the implementation of special computational procedures.

Value current corrosion Icorresults computational procedures implemented by the device according to the formula

whereandInto- asked from the keyboard 17, the values of the programmable coefficients of Tafila.

Then, the obtained current corrosion is recalculated device in the corrosion rate Vcorin accordance with the formula

where K and S - set from the keyboard 17, the values of conversion coefficients, taking into account the material and the area of the electrodes of the sensor (probe), respectively.

In practice, the measurement of the current when exposed to a small potential difference to the electrodes is complicated by the fact that at the electrode-solution there is a double electric layer, i.e., the electrical capacity. The presence of capacity leads to the fact that in the first moment after the filing of the potential difference at the El is a significant corrosion rate depend on time Tcmelapsed since the filing of the potential difference to the electrodes and the beginning of the measurement.

The capacity of the electric double layer is determined by the electrochemical properties of the electrode system is the solution, nature of the electrolyte, the presence in the electrolyte of surfactants, etc. and may vary within wide limits. Accordingly, in a wide variation and the period of time Tcmneeded to obtain correct values of current Icorfrom several seconds to tens of minutes. In this regard, the device provides programmable keyboard values of Tcm- time period for a specific system parameters the electrode-solution.

In addition, the controller 17 can be set interval of time, the magnetism between adjacent measurements.

Measurements are as follows.

After switching on the device the operator from the keyboard 17 to set the current time and the start date of the measurement, the values of the coefficients InandInto, K and S and the measurement parameters: Tcm- the time interval between the voltage supply to the electrodes of the sensor 1 and the beginning of the measurement and TISM- the time interval between measurements.

the Oia only appears after the command, submitted by the operator via the keyboard 17. While the display 18 and the functional blocks of the device are constantly in an active state only at the time of measuring the keyboard 17 is blocked.

In offline mode, measurements are performed without human intervention, automatically, through defined between measurement intervals TISM.

In this mode, the display 18 with MACP 6, unit 5 pre-processing of the signals is active only during the time interval of the next measurement, and in the intervals between measurements are automatically turned off ("sleep" mode), which ensures the most efficient use of energy supply and increasing the battery life of the device.

Once the operator is selected and run the measurement mode, the sensor electrodes 1 through the electrical connectors 20 and 23 serves a small voltage(20-30 mV). Next, at time intervals TcmMACP 6 produces a measurement resulting in the microprocessor 9 calculates RMP, IcorVcorand stores them in the RAM 11, and the display 18 indicates the values obtained. The results of measurements of the RAM 11 through the interface and through the electrical connector 4 persepectives to the next record. For each dimension remembered IcorVcordate and time of its implementation. The next measurement is performed after a preset time interval TISM.

The temperature sensor 15 cyclically sampled and its readings are entered into the microprocessor 9. If the temperature is below the setpoint, then through the supply-controller 16 turns on the heating element 19. When the temperature is above the setpoint via the controller power supply 16 of the heating element 19 is turned off.

Thus, the informative signals received from the sensor 1, proceed to the cables 2 and 24 through electrical connectors 23 and 20 in block 5 of the preliminary signal processing, where they are amplified and MACP 6 is converted into a digital form. Entering the microprocessor 9, the signals are processed according to a given program, and the final result is displayed on the display 18 and stored in the RAM 11. From the RAM 11 information is overwritten on the corresponding interface, which connects the microprocessor 9 and the first electric connector 4, in the memory module 21. In the non-volatile memory module 21 are recorded and accumulated current value corrosion Icor, corrosion rate Vcor,yet its replacement by a new module to resume operation.

Further contained in the memory module 21 reads the information in the data processing system (computer) 26. For this purpose, the memory module 21 through the interface 27, the unit reading data 25 through the interface 28 connected to the computer 26. The obtained information is analyzed to determine trends in the development of the corrosion process.

Thus, expanding the functionality of the device is achieved through
a) introduction of two measurement modes: manual under the operator's control and Autonomous for a given program;
b) control the measurement process and by changing the coefficients and the time intervals between measurements;
C) implement a continuous monitoring of the corrosion process.

Increase the battery life of the device without replacing the batteries is achieved by reducing energy consumption by dispatching power, the introduction of "sleep" mode and use non-volatile functional units.

Operation of the device at ambient temperatures from -45oC to +55oWith achieved by mounting electronic part of the device in a hermetically sealed protective box and create thermal conditions necessary for the functioning W the AI has been tested which gave positive results. The device received a certificate of conformity.

Measuring the parameters of corrosion is designed to work with any two-electrode sensors and sensors with disk electrodes "flush". There is no rigid connection to the cable length probe (sensor) and its parameters.

Main technical data of device.

1. Measuring range R - resistance of the interelectrode gap of the probe from 0.5 to 9104Om.

2. The limit values of the relative error of 5%.

3. The measuring range of Icor- current corrosion is from 0.02 ľa to 500 mA.

4. Measuring range Vcor- corrosion rate from 0.001 to 100 mm/year.

5. The capacity of the memory module is not less than 32000 data packets.

The device provides up to 100 hours of continuous operation in a laboratory environment or 1.5 weeks of battery life in real conditions at TISM=6 hours and Tcm<15 C.


Claims

1. Measuring the parameters of corrosion that contains the sensor-transducer informative values into electrical signals, the non-volatile memory module and located in the housing of the source Pitot is connected to the input multi-channel analog-to-digital Converter (MACP), including the multiplexer and the ADC, and a microprocessor including a controller, random access memory and the real time clock, characterized in that it additionally placed in the housing of the second electrical connector, controller, power supply, keyboard, LCD display, real time clock and the heating element, and a microprocessor connected to the relevant one-way links with the pre-signal processing, liquid crystal display, and the relevant bilateral ties with MACP, keyboard, real time clock, temperature sensor, controller, power supply and a first electrical connector that their information outputs are connected in parallel digital outputs MACP, the second electrical connector bilateral ties connected to the preprocessing block signals, the controller power his three control outputs respectively connected to the first electrical connector, the heating element and the preprocessing block signals together with liquid crystal display, a power source connected to the respective power supply inputs sensor tempera is Amati, connected bilateral ties to the first electrical connector and the body placed in it functional blocks and elements placed in a sealed protective box, equipped with the third electrical connector inputs connected via cable with sensor-primary Converter informative values into electrical signals, and outputs through the cable inside the box, with the second electrical connector.

2. Measuring the parameters of corrosion under item 1, wherein the primary Converter informative quantities into electrical signals in the form of a probe that includes two electrodes of the sensor connected to the cable.

3. Measuring the parameters of corrosion under item 1, characterized in that the housing contains two electrical connector mounted on its front side, and the front panel, which is the keyboard and the display liquid crystal display, and the temperature sensor and the heating element is placed near the display and have him thermal coupling.

4. Measuring the parameters of corrosion under item 1, characterized in that the sealed protective box made of material of high strength, such as polystyrene, and consists of a cover and Uchenie to the second electrical connector housing, and has a filler of a material with low thermal conductivity, such as a foam material or isolon, and the cable is located between the substrate and the filler, and the box is equipped with brackets for installation in a suspended state.

5. Measuring the parameters of corrosion under item 1, wherein the non-volatile memory module are removable, with the ability to connect to the first electrical connector with the outside of the hull.

 

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