CN113465813A - Capacitive differential pressure transmitter with pressure leading pipe blockage self-diagnosis function - Google Patents
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- 238000003745 diagnosis Methods 0.000 claims abstract description 35
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
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- 239000002775 capsule Substances 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 23
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
Abstract
The invention provides a capacitance type differential pressure transmitter with a pressure guide pipe blockage self-diagnosis function, which is characterized by comprising the following functional layers: a basic measurement module and an edge intelligent module; the basic measurement module is responsible for converting the pressure signal into an electric signal, amplifying the electric signal, performing digital-to-analog conversion, and packaging the electric signal into a serial port message; the edge intelligent module is responsible for communicating with an upper computer through an industrial bus, diagnoses the pressure pipe blockage faults, and diagnoses the pressure pipe blockage faults through the independent edge intelligent module. The invention can monitor the fault state of the instrument pressure guiding pipe on the edge side in real time, and display and report the fault information in time, and the reaction is rapid and timely; the fault state of the instrument pressure leading pipe can be monitored only by utilizing the pressure signal without additionally installing other sensors, and non-invasive fault monitoring can be realized; the fault diagnosis work can be completed on the premise of not influencing the basic functions.
Description
Technical Field
The invention relates to the field of fault diagnosis of pressure instruments, in particular to a capacitive differential pressure transmitter with a pressure guide pipe blockage self-diagnosis function.
Background
The pressure instrument is responsible for monitoring the pressure of equipment in process automation, plays an important role in the fields of chemical engineering, metallurgy and the like, and ensures high-efficiency and safe production in normal and stable operation, so that the research and development of the pressure instrument with the fault self-diagnosis function has great significance. However, in the current meter market in China, a low-end meter occupies more than half of the market share, a high-end meter with a fault self-diagnosis function is lacked, and the development of a pressure meter which is applied to the edge side and can diagnose the fault state of the pressure meter is urgent. Therefore, the pressure instrument with the fault self-diagnosis function is provided, operates on the edge side in a factory environment, can realize diagnosis of the blockage fault of the pressure instrument pressure leading pipe while ensuring that the basic functions of pressure signal acquisition, signal processing, industrial communication and the like of the instrument are finished, and ensures the healthy and stable operation of the instrument in the industrial environment.
Disclosure of Invention
The invention aims to at least solve the technical problems in the prior art, and aims at overcoming the defects of the existing pressure instrument, the invention provides a fault diagnosis function on the basis of the original pressure instrument, can realize the real-time monitoring of the blocking state of the pressure guiding pipe of the instrument on the basis of finishing the functions of pressure signal acquisition, signal amplification, pressure data transmission and the like of the pressure instrument, and can timely send out an alarm when the blocking of the pressure guiding pipe of the instrument is monitored, thereby solving the problem that the existing instrument is difficult to monitor the self running state, and ensuring the high-efficiency and stable production of the process industry.
In order to achieve the above purpose, the present invention provides a capacitive differential pressure transmitter with a pressure guiding pipe blockage self-diagnosis function, wherein a pressure instrument with a fault self-diagnosis function mainly comprises two major modules, namely a basic measurement module and an edge intelligent module.
The basic measurement module is responsible for acquiring pressure signals, converting the pressure signals into electric signals, and packaging the electric signals into serial port messages after amplification and analog-to-digital conversion.
The edge intelligent module is responsible for monitoring the blocking state of the pressure guiding pipe on one hand and is responsible for communicating with an upper computer through an industrial bus on the other hand.
The pressure instrument with the fault self-diagnosis function comprises a hardware system and a software system, wherein the hardware system and the software system are matched with each other to cooperatively finish the work of signal acquisition, signal amplification, bus communication, fault monitoring and the like.
The hardware system mainly comprises a diaphragm capsule, a basic measuring card, an edge intelligent card, a liquid crystal display module, a shell, a front end cover, a rear end cover, a flange and an O-shaped ring.
The diaphragm capsule is connected with basic measuring card, and the diaphragm capsule both sides are high pressure side metal diaphragm and low pressure side metal diaphragm respectively, and diaphragm capsule central authorities do, through the pressure leading pipe and flange respectively with low pressure side, high pressure side contact in the use, and the diaphragm capsule is inside to be full of silicon oil, and the outside change of diaphragm capsule will arouse diaphragm capsule both sides metal diaphragm deformation for both sides diaphragm and diaphragm capsule central authorities diaphragm interval change, and then arouse the diaphragm capsule capacitance value to change, thereby realize converting pressure signal into the signal of telecommunication.
The basic measurement card is connected with the diaphragm box and the edge smart card through flat cables, the basic measurement card, the diaphragm box and the metal shell jointly form a sensitive element, the basic measurement card comprises a single chip microcomputer, a digital-to-analog converter, an operational amplifier and the like, the basic measurement card collects weak current signals generated by the diaphragm box, the weak current signals are amplified through the operational amplifier and converted into digital signals through the digital-to-analog converter to be transmitted to the single chip microcomputer, and the single chip microcomputer packages the digital signals into serial port messages after obtaining the digital signals and transmits the serial port messages to the edge smart card connected with the serial port messages.
The front side and the rear side of the sensitive element are respectively a high-pressure side and a low-pressure side, the two sides of the sensitive element are respectively connected with the two flanges, the flanges on the front side and the rear side are connected with nuts through four sets of bolts penetrating through the two flanges, a through channel is arranged in the flanges, one end of the channel is communicated with the outer side of the diaphragm capsule, the other end of the channel is connected with a transition joint, the transition joint is connected with process equipment through a pressure-leading pipe in the using process of the instrument, and the outer side of the diaphragm capsule, the inner channel of the flange, the pressure-leading pipe and the process equipment are communicated with each other to have the same pressure under the condition that the instrument does not break down.
The two O-shaped rings are respectively used on the high-pressure side and the low-pressure side and are positioned between the flange and the sensitive element, a groove which is matched with the O-shaped ring is formed in the surface of the flange, one side of the O-shaped ring is embedded into the groove, and the other side of the O-shaped ring is directly contacted with the surface of the sensitive element. The O-shaped ring is used for sealing work and preventing media such as liquid, gas and the like from leaking from a gap between the sensitive element and the flange.
The shell is connected with an assembly formed by the sensing element, the flange and the O-shaped ring, external threads are arranged on the outer side of the sensing element, internal threads are arranged on the inner side of the shell, and the internal threads and the external threads are matched with each other to be connected.
The edge smart card is connected with the basic measuring card and the liquid crystal display module, and the edge smart card is fixed inside the shell. The edge smart card has the functions of bus communication, fault monitoring and the like, receives a pressure signal sent by the basic measuring card through a serial port, and forwards the pressure signal to an upper computer through an industrial bus according to communication protocols such as an FF (foundation field) protocol and a Modbus so as to complete bus communication work; meanwhile, the calculating card analyzes the pressure signal, monitors the blocking state of the instrument pressure guiding pipe, and sends an alarm signal through an industrial bus and displays a fault alarm signal through the liquid crystal display module when the pressure guiding pipe is blocked.
The liquid crystal display module is connected with the computer card, and the liquid crystal display module is positioned in the shell and sealed by the end cover. The liquid crystal display module is responsible for the pressure numerical value and the work of the display of the pressure guiding pipe jam state, when the pressure guiding pipe jam monitoring program in the calculating card judges that the pressure guiding pipe does not jam, the liquid crystal display module displays the pressure numerical value collected by the pressure instrument, and when the pressure guiding pipe jams, an error prompt text is displayed.
The front end cover is connected with the shell through threads, the liquid crystal display module is arranged behind the front end cover, the front end cover is responsible for protecting the liquid crystal display module, elements in the shell are protected in a sealing mode, and damage such as circuit board corrosion caused by rainwater, dust and the like entering the shell from the outside is prevented.
The rear end cover is connected with the shell through threads, the edge smart card is arranged behind the rear end cover, and the rear end cover is responsible for protecting the edge smart card and sealing and protecting the inside of an internal element of the shell to prevent rainwater and dust from entering the inside from the outside to cause circuit board corrosion and other damages.
The software system comprises a basic measuring unit, a communication unit and an intelligent diagnosis unit, wherein the basic measuring unit runs on a basic measuring card, and the communication unit and the intelligent diagnosis unit run on an edge intelligent card.
The basic measurement unit runs on a single chip microcomputer of a basic measurement card, one end of the single chip microcomputer is connected with an analog-digital conversion chip, the other end of the single chip microcomputer is connected with an edge intelligent card through a serial port, the basic measurement unit is mainly responsible for collecting pressure electric signals which are amplified and converted in an analog-digital mode, and the work flow of the basic measurement unit comprises the following steps:
s1, acquiring digital pressure signals at fixed period by an analog-to-digital conversion chip, and storing the digital pressure signals in a memory, wherein the analog-to-digital conversion chip converts analog pressure signals into digital pressure signals, and the acquired analog signals come from signals acquired by a diaphragm capsule and amplified by an operational amplifier;
and S2, packaging the pressure signals stored in the memory into serial port messages, wherein the message information comprises a frame header, a high-voltage signal, a low-voltage signal, a differential pressure signal, a check code and a frame tail.
And S3, transmitting the serial port message to a serial port sending buffer area, and transmitting the message to the communication circuit board through the serial port.
The communication unit runs on a singlechip of the edge smart card, the singlechip is respectively connected with the basic measuring card, the bus communication chip and the liquid crystal display module and is powered by a power supply, the communication unit is mainly responsible for sending a pressure signal to an upper computer through an industrial bus, and the working flow of the communication unit comprises the following steps:
s1, receiving pressure data which are uploaded by the basic measurement card and packaged into serial port messages through a serial port, and storing the data in a memory;
s2, analyzing the pressure data in the memory, and encapsulating the data again according to the protocol specified structure;
and S3, transmitting the data after being packaged again to a bus communication chip, and transmitting the data to an upper computer through an industrial bus by the bus communication chip.
In addition, the communication unit can receive a control command issued by the upper computer, can be matched with the intelligent diagnosis unit, and uploads a diagnosis result after the intelligent diagnosis unit obtains the diagnosis result.
The intelligent diagnosis unit is operated on a singlechip of the edge intelligent card, the intelligent diagnosis unit is mainly responsible for judging whether the pressure guiding pipe is blocked or not by analyzing a pressure signal, and the edge unit-only workflow comprises the following steps:
s1, performing low-pass filtering operation on the original pressure signal to obtain a filtered pressure signal, filtering high-frequency noise in the signal, and reducing the influence of the high-frequency noise on a diagnosis result;
s2, performing windowed Fourier transform on the filtered pressure signal, and acquiring a frequency domain signal of the filtered pressure signal in a time-frequency transform mode;
s3, obtaining a frequency value when the signal intensity is reduced by 3dB in the frequency domain signal as a characteristic value;
s4, comparing the characteristic value with the set threshold value to obtain a diagnosis result;
and S5, if the diagnosis result is that the pressure guide pipe is blocked, uploading the diagnosis result, displaying that the pressure guide pipe is blocked through the liquid crystal display module, and finishing fault alarm.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention can monitor the fault state of the instrument pressure guiding pipe on the edge side in real time, and display and report the fault information in time, and the reaction is rapid and timely;
2. the invention can monitor the fault state of the instrument pressure leading pipe only by utilizing the pressure signal without additionally installing other sensors, and can realize non-invasive fault monitoring;
3. the fault monitoring function of the invention utilizes the residual computing power of the instrument after completing basic functions such as communication and the like to operate the fault diagnosis algorithm, and can complete the fault diagnosis work on the premise of not influencing the basic functions.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a core function configuration diagram of the present invention;
FIG. 2 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 3 is a schematic diagram of the electrical system of the present invention;
FIG. 4 is a schematic diagram of an edge intelligence module workflow;
FIG. 5 is a schematic diagram of a power spectrum calculation process;
the measuring device comprises a shell, a front end cover, a liquid crystal display module, an edge smart card, a rear end cover, a base measuring card, a low-pressure side flange, a low-pressure side O-shaped ring, a diaphragm capsule, a high-pressure side O-shaped ring and a high-pressure side flange, wherein the shell is 1, the front end cover is 2, the liquid crystal display module is 3, the edge smart card is 4, the rear end cover is 5, the base measuring card is 6, the low-pressure side flange is 7, the low-pressure side O-shaped ring is 8, the diaphragm capsule is 9, the high-pressure side O-shaped ring is 10, and the high-pressure side flange is 11.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the core function configuration of the present invention is shown.
The invention provides a capacitive differential pressure transmitter with a pressure guide pipe blockage self-diagnosis function, which comprises a basic measurement module and an edge intelligent module on a functional level, wherein the edge intelligent module operates independently relative to the basic measurement module and is responsible for completing diagnosis of the pressure guide pipe blockage state and communicating with an upper computer through an industrial bus; the basic measurement module is responsible for converting the pressure signal into an electric signal, amplifying the electric signal, performing digital-to-analog conversion, and packaging the electric signal into a serial port message.
Fig. 2 is a schematic diagram of the overall structure of the capacitive differential pressure transmitter with the self-diagnosis function of the pressure guiding pipe blockage according to the present invention.
The capacitive differential pressure transmitter with the pressure guiding pipe blockage self-diagnosis function mainly comprises an electrical system and a mechanical system, wherein the electrical system undertakes core work such as measurement, communication, fault diagnosis and the like of an instrument, the mechanical system undertakes the functions of gas circuit connection, fixing and circuit protection, and the electrical system consists of a liquid crystal display module 3, an edge intelligent card 4, a basic measurement card 6 and a diaphragm capsule 9; the mechanical system comprises a shell 1, a front end cover 2, a rear end cover 5, a low-pressure side flange 7, a low-pressure side O-shaped ring 8, a high-pressure side O-shaped ring 10 and a high-pressure side flange 11. The connection mode of all elements in the electrical system is electrical connection, and the connection mode of the mechanical system and the mechanical elements and the electrical elements is mechanical matching.
In the electric system, a liquid crystal display module 3 is connected with an edge intelligent card 4 through an IIC interface; the edge smart card 4 is connected with the basic measurement card 6 through a serial port; the basic measuring card 6 is connected with the capsule 9 through three leads.
In the mechanical system, the front side of a shell 1 is connected with a front end cover 2 through threads; the rear side of the shell 1 is connected with the rear end cover 5 through threads; the upper groove of the liquid crystal display module 3 is matched with the upper bulge of the shell 1 to fix the position of the liquid crystal display module 3; the front end cover 2 is matched with the shell 1 through threads and presses the liquid crystal display module 3 downwards, so that the position of the liquid crystal display module 3 is fixed; the upper groove of the edge smart card 4 is matched with the upper protrusion of the shell 1 to fix the position of the edge smart card 4; the rear end cover 5 is matched with the shell 1 through threads, and meanwhile, the edge smart card 4 is pressed downwards to fix the position of the edge smart card 4; a circular groove is formed in the low-pressure side flange 7 and matched with the low-pressure side O-shaped ring 8 so as to fix the position of the low-pressure side O-shaped ring 8; the low-pressure side O-shaped ring 8 is directly contacted with the diaphragm capsule 9; a circular groove is formed in the high-pressure side flange 11 and is matched with the high-pressure side O-shaped ring 10 so as to fix the position of the high-pressure side O-shaped ring 10; transition elements are arranged on the low-pressure side flange 7 and the high-pressure side flange 11 and used for connecting the flanges and the pressure guiding pipe, and the transition elements are communicated with the outer side of the diaphragm capsule 9 through the inner pipelines of the flanges, so that the pressure transmission work is completed.
Fig. 3 is a schematic view of the electrical system of the present invention.
In the electric system, a 3.3V pin of a liquid crystal display module 3 is connected with a 3.3V pin of an edge intelligent card 4, an SCL pin of the liquid crystal display module 3 is connected with an SCL pin of the edge intelligent card 4, an SDA pin of the liquid crystal display module 3 is connected with an SDA pin of the edge intelligent card 4, and a GND pin of the liquid crystal display module 3 is connected with a GND pin of the edge intelligent card 4; a 3.3V pin of the edge smart card 4 is connected with a 3.3V pin of the basic measurement card 6, a TX pin of the edge smart card 4 is connected with an RX pin of the basic measurement card 6, an RX pin of the edge smart card 4 is connected with a TX pin of the basic measurement card 6, and a GND pin of the edge smart card 4 is connected with a GND pin of the basic measurement card 6; the pin CH1 of the basic measurement card 6 is connected with the diaphragm capsule 9 low pressure side diaphragm, the pin CH2 of the basic measurement card 6 is connected with the diaphragm capsule 9 central diaphragm, and the pin CH3 of the basic measurement card 6 is connected with the diaphragm capsule 9 high pressure side diaphragm.
As shown in fig. 4, a schematic diagram of the workflow of the edge intelligent module includes the following steps:
s1, performing low-pass filtering operation on the original pressure signal by using a low-pass filter to obtain a filtered pressure signal, filtering high-frequency noise in the signal, and reducing the influence of the high-frequency noise on a diagnosis result;
s2, performing windowed Fourier transform on the filtered pressure signal, acquiring frequency domain information of the filtered pressure signal through discrete Fourier transform, and preparing for extracting frequency domain characteristics;
s3, obtaining a frequency value when the signal intensity is reduced by 3dB in the frequency domain signal as a characteristic value;
s4, comparing the characteristic value with the set threshold value to obtain a diagnosis result, and if the extracted characteristic value is smaller than the set threshold value, determining that the pressure guiding pipe is blocked;
and S5, if the diagnosis result is that the pressure guiding pipe is blocked, uploading the diagnosis result, displaying that the pressure guiding pipe is blocked through the liquid crystal display module 3, and finishing fault alarm.
As shown in fig. 5, a schematic diagram of a process for implementing time-frequency transformation in an edge intelligent module includes the following steps:
s1, dividing the data with the length of N into L sections, wherein the second half section of each section of data is overlapped with the next section of data by M/2, so that the number L of the sections is as follows:
s2, applying the same smoothing window to each segment, and then performing fourier transform to obtain:
S3, averaging the power spectrums of the sections to obtain:
while embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A capacitive differential pressure transmitter with a pressure introduction pipe blockage self-diagnosis function is characterized by comprising: a basic measurement module and an edge intelligent module;
the basic measurement module is responsible for converting the pressure signal into an electric signal, amplifying the electric signal, performing digital-to-analog conversion, and packaging the electric signal into a serial port message;
the edge intelligent module is responsible for communicating with an upper computer through an industrial bus and diagnosing the blockage fault of the pressure guiding pipe.
2. A capacitive differential pressure transmitter with a pressure introduction pipe blockage self-diagnosis function is characterized by comprising: the system comprises a basic measurement unit, a communication unit and an intelligent diagnosis unit;
the basic measuring unit runs on a single chip microcomputer of the measuring circuit board and is used for collecting the pressure electric signal which is amplified and subjected to analog-digital conversion;
the communication unit runs on a singlechip of the edge smart card and is used for uploading pressure signals and issuing control instructions through an industrial bus;
the intelligent diagnosis unit runs on a singlechip of the edge intelligent card and is used for monitoring the blocking state of the pressure guiding pipe.
3. A capacitive differential pressure transmitter with a pressure introduction pipe blockage self-diagnosis function is characterized by comprising: electrical and mechanical systems;
the mechanical system comprises a shell, a front end cover, a rear end cover, a low-pressure side flange, a low-pressure side O-shaped ring, a high-pressure side O-shaped ring and a high-pressure side flange;
the shell, and a front end cover, a liquid crystal display module and a rear end cover which are respectively connected with the shell are used for forming support and sealing and protecting internal elements;
the diaphragm capsule is connected with the low-pressure side flange, the low-pressure side O-shaped ring, the high-pressure side O-shaped ring and the high-pressure side flange and is used for transmitting the pressure of a working medium and converting the pressure change into a current signal;
the electric system comprises a liquid crystal display module, an edge smart card, a basic measurement card and a diaphragm capsule;
the basic measuring card is connected with a diaphragm capsule and an edge intelligent card and is responsible for executing the work of acquisition, amplification and analog-to-digital conversion of an original electric signal;
the edge intelligent card is connected with the liquid crystal display module and the basic measuring card and is responsible for executing bus communication and pressure leading pipe blockage diagnosis.
4. The capacitive differential pressure transmitter with the pressure guiding pipe blockage self-diagnosis function according to claim 3, wherein the edge intelligent module workflow comprises the following steps:
s1, performing low-pass filtering operation on the original pressure signal to obtain a filtered pressure signal, filtering high-frequency noise in the signal, and reducing the influence of the high-frequency noise on a diagnosis result;
s2, performing windowed Fourier transform on the filtered pressure signal, and acquiring a frequency domain signal of the filtered pressure signal in a time-frequency transform mode;
s3, obtaining a frequency value when the signal intensity is reduced by 3dB in the frequency domain signal as a characteristic value;
s4, comparing the characteristic value with the set threshold value to obtain a diagnosis result;
and S5, if the diagnosis result is that the pressure guide pipe is blocked, uploading the diagnosis result, displaying that the pressure guide pipe is blocked through the liquid crystal display module, and finishing fault alarm.
5. The capacitive differential pressure transmitter with the pressure guiding pipe blockage self-diagnosis function according to claim 4, wherein the edge intelligent module time-frequency transformation process comprises the following steps:
s1, dividing the data with the length of N into L sections, wherein each section has elbow points, and adjacent sections are overlapped by M/2;
s2, applying the same smooth window to each segment, and then carrying out Fourier transform to obtain the power spectral density result of each window;
and S3, averaging the power spectrums of the sections to obtain the power spectrum density of the whole signal.
6. The capacitive differential pressure transmitter with the pressure guiding pipe blockage self-diagnosis function according to claim 3, wherein the basic measurement module adopts a serial port as a communication means for transmitting the pressure signal to the edge smart card.
7. The capacitive differential pressure transmitter with the self-diagnosis function of the pressure leading pipe blockage according to claim 3, wherein the communication module adopts Modbus or FF industrial bus protocol as a means for communicating with an upper computer.
8. The capacitive differential pressure transmitter with the pressure guide pipe blockage self-diagnosis function is characterized by comprising the following working processes:
s1, the diaphragm capsule converts the slight deformation generated by the pressure change into a weak analog electric signal and transmits the signal to the basic measuring module;
s2, the basic measurement card amplifies the weak analog electric signal through the operational amplifier circuit, and converts the signal into digital electric signal by the digital-to-analog converter, the basic measurement module running on the basic measurement card collects the digital electric signal and packages the digital electric signal into serial port message to be transmitted to the communication module;
s3, the edge smart card receives the pressure signal packaged as the serial port message, and the intelligent diagnosis unit operated on the edge smart card analyzes the pressure signal, so as to judge whether the pressure guiding pipe is blocked;
s4, when the intelligent diagnosis unit judges that the pressure guiding pipe is blocked, the liquid crystal display module gives an alarm for the blocking fault, and the information of the blocking fault is reported to the upper computer through the industrial bus;
and S5, the intelligent diagnosis unit is communicated with the upper computer while performing pressure guide pipe blockage fault diagnosis, so that a control instruction is received and the pressure state is uploaded.
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| CN115099273A (en) * | 2022-06-22 | 2022-09-23 | 中国科学院沈阳自动化研究所 | Intelligent fault diagnosis method for pressure instrument pressure leading pipe based on deep learning |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001159573A (en) * | 1999-12-03 | 2001-06-12 | Yamatake Corp | Pressure detecting device |
| JP2004028704A (en) * | 2002-06-24 | 2004-01-29 | Fuji Electric Holdings Co Ltd | Apparatus for measuring differential pressure |
| CN101113934A (en) * | 2007-07-24 | 2008-01-30 | 天津天仪集团仪表有限公司 | Intelligent capacitance differential pressure cell and method |
| US20100011869A1 (en) * | 2007-07-20 | 2010-01-21 | Rosemount Inc. | Differential pressure diagnostic for process fluid pulsations |
| US20140366650A1 (en) * | 2012-01-31 | 2014-12-18 | Smart Skin Technologies, Inc. | Pressure Mapping and Orientation Sensing System |
| CN105466609A (en) * | 2014-08-31 | 2016-04-06 | 田荣侠 | Capacitance-type micro-differential pressure smart transmitter |
| CN111735559A (en) * | 2020-06-29 | 2020-10-02 | 沈阳中科博微科技股份有限公司 | Capacitive edge calculation pressure transmitter acquisition and diagnosis circuit and working method thereof |
| CN113091994A (en) * | 2021-04-12 | 2021-07-09 | 成都皓瀚完井岩电科技有限公司 | High static pressure differential pressure transducer |
-
2021
- 2021-07-30 CN CN202110876517.7A patent/CN113465813A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001159573A (en) * | 1999-12-03 | 2001-06-12 | Yamatake Corp | Pressure detecting device |
| JP2004028704A (en) * | 2002-06-24 | 2004-01-29 | Fuji Electric Holdings Co Ltd | Apparatus for measuring differential pressure |
| US20100011869A1 (en) * | 2007-07-20 | 2010-01-21 | Rosemount Inc. | Differential pressure diagnostic for process fluid pulsations |
| CN101113934A (en) * | 2007-07-24 | 2008-01-30 | 天津天仪集团仪表有限公司 | Intelligent capacitance differential pressure cell and method |
| US20140366650A1 (en) * | 2012-01-31 | 2014-12-18 | Smart Skin Technologies, Inc. | Pressure Mapping and Orientation Sensing System |
| CN105466609A (en) * | 2014-08-31 | 2016-04-06 | 田荣侠 | Capacitance-type micro-differential pressure smart transmitter |
| CN111735559A (en) * | 2020-06-29 | 2020-10-02 | 沈阳中科博微科技股份有限公司 | Capacitive edge calculation pressure transmitter acquisition and diagnosis circuit and working method thereof |
| CN113091994A (en) * | 2021-04-12 | 2021-07-09 | 成都皓瀚完井岩电科技有限公司 | High static pressure differential pressure transducer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115099273A (en) * | 2022-06-22 | 2022-09-23 | 中国科学院沈阳自动化研究所 | Intelligent fault diagnosis method for pressure instrument pressure leading pipe based on deep learning |
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