CN101271054A - Fluid closed loop type on-line liquid density transmitter - Google Patents
Fluid closed loop type on-line liquid density transmitter Download PDFInfo
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- CN101271054A CN101271054A CNA2008100549140A CN200810054914A CN101271054A CN 101271054 A CN101271054 A CN 101271054A CN A2008100549140 A CNA2008100549140 A CN A2008100549140A CN 200810054914 A CN200810054914 A CN 200810054914A CN 101271054 A CN101271054 A CN 101271054A
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- density
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- temperature
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Abstract
The invention belongs to a fluid closed loop type integrated on-line liquid density transmitter which is applicable in density measurement of flowing liquid and static liquid in pipes and cans. The invention includes a precise difference sensor and a professional sampling and closed loop control computer integrated circuit board and a specially matching temperature compensation controller; the differential pressure sensor measures the pressure of different pressure pipes, converts modulus and calculates the closed loop control and displays the density and the medium temperature to the gauge head of an instrument with a double four-digit display screen, and has remote monitoring and maintenance according to a HART agreement.
Description
Technical field
The invention belongs to a kind of fluid closed loop type on-line liquid density transmitter, be applicable to the density measure of pipeline and jar interior working fluid and static liquid.
Background technology
The measurement of fluid density can provide data for technological design, infers the purity of material, determine the concentration of material etc. fast.In the intermediate controlled and product inspection of many fluid products, density is an important index.The density traditional measurement mainly passes through the quality and the volume of measuring unit's liquid respectively, using always has three kinds of methods, be respectively density bottle weight method, densimeter method, U type pipe method, said method is mostly by manually finishing, and not only workload is big, also often because human factor causes error in data, there is certain error in temperature when temperature when taking a sample simultaneously and measurement, the accurate actual conditions of measure field liquid, the temperature difference is big more, and density actual value and measured value gap are big more; Real-time change when also having scene temperature, pressure, and above-mentioned metering system can't onlinely be understood liquid condition at any time, seriously restricts the lifting of enterprise automation level.
In addition, liquid can produce fluctuation in flow process, and fluctuation can cause the data generation deviation of online acquisition, and then makes the density value that calculates present the great-jump-forward variation, can't obtain level and smooth data and curves.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of influence of avoiding personal error and medium temperature to density measure is provided, satisfy the requirement of industrial automation simultaneously, measuring accuracy height, medium are wide, good reliability, measurement range are wide, and can realize the fluid closed loop type on-line liquid density transmitter of remote monitoring and maintenance.
Purpose of the present invention can realize by following technical scheme:
Fluid closed loop type on-line liquid density test transmitter, mainly form by density probe and output display communication gauge outfit, it is characterized in that: the density probe is provided with accurate differential pressure pick-up and temperature sensor, have on the gauge outfit, temperature compensator, the density closed loop is calculated and the temperature compensation processor, LCD control system, data in real time display device and the interface of power supply is provided for transmitter, accurate differential pressure pick-up on the density probe links to each other with differential pressure sampling electronic circuit, the output signal of differential pressure sampling electronic circuit is sent into the density closed loop and is calculated and the temperature compensation processor, the density closed loop is calculated and the shows signal of temperature compensation processor is sent into display through LCD controller, the density closed loop is calculated and the output signal one tunnel of temperature compensation processor is exported 4 ~ 20mA standard signal through the D/A conversion, another road communicates signal through signal modulation circuit output according to the HART agreement, and the temperature compensated device of the sampled signal of temperature sensor is sent into the density closed loop and calculated and the temperature compensation processor.
Purpose of the present invention can also realize by following technical scheme:
The mainboard of accurate differential pressure pick-up is a differential pressure sampling tablet, differential pressure sampling tablet adopts bridge circuit by two barrier film gaging pressures, two barrier films are 1# channel pressure diaphragm and 2# channel pressure diaphragm, pressure passes through behind 1# channel pressure diaphragm and the 2# channel pressure diaphragm liquid transfer in the pipeline to be arrived in the accurate differential pressure pick-up, after accurate differential pressure pick-up was converted to electric signal with pressure signal, the differential pressure sampling electronic circuit that is input in the differential pressure sampling tablet was the readable signal of microprocessor board with electrical signal conversion;
Temperature sensor is made up of the temperature compensator plate, and the temperature compensator plate is proofreaied and correct the linear error of environment temperature, non-pass amount error by triode and adjustable resistance, and the temperature value after the correction is sent to microprocessor board;
The density closed loop is calculated with the temperature compensation processor plate and is connected with the temperature compensator plate with differential pressure sampling tablet by flat cable, the density closed loop is calculated and the temperature compensation processor plate comprises 80C196 microcontroller and PSD301 programmable peripheral device, user's configurable logic circuit is arranged on the PSD301, the internal lock storage, programmable address decoder, the I/O port, EPROM and SRAM, (PSD301 is with user's configurable logic circuit to comprise 80C196 microcontroller and PSD301 programmable peripheral device, the internal lock storage, programmable address decoder, the I/O port, on all integrated device of EPROM and SRAM, make the transmitter volume littler, integrated level is higher), can outputting standard 4 ~ 20mA current signal.Comprise that simultaneously power circuit gives system's other parts power supply, also have the communication hardware of forming by communication conveyer and line driver/receiver, feeds of data is controlled net to production run according to the HART agreement.
LCD panel is connected by flat cable with processor plate, and density after handling and temperature data are shown on two 4-digit number LCD.
Density probe of the present invention is the microscler body of rod; 2# channel pressure diaphragm arrangement is on the body of rod of density probe bottom; 1# channel pressure diaphragm arrangement is on the body of rod on 2# channel pressure diaphragm top; on the body of rod between 1# channel pressure diaphragm and the 2# channel pressure diaphragm, temperature sensor is set; the density probe is provided with the protection sealed tube; joint flange is arranged at the top of density probe; differential pressure pick-up and differential pressure pick-up protective sleeve are installed on joint flange top, on the differential pressure pick-up protective sleeve LCDs are installed.
Principle of work of the present invention is as follows:
The present invention is a kind of liquid internal pressure and principle that liquid depth, fluid density are directly proportional used, and comprises accurate difference sensor and specialty sampling, closed-loop control calculating surface-mounted integrated circuit and supporting single-minded temperature compensator.Differential pressure pick-up passes through to measure the pressure differential of different pressures pipeline, and sampling and carry out analog to digital conversion through differential pressure sampling electronic circuit is sent to processor.On-the-spot medium temperature is sent in the temperature compensator by temperature sensor, is sent to processor by the temperature signal after the compensation.Density closed-loop control calculating and temperature compensation processor are the cores of transmitter, after it calculates by density closed-loop control calculating and temperature compensation, digital signal is passed through LCD controller on the one hand, current density and medium temperature are shown to the Dial of instrument of being with two 4-digit number display screens, by digital-to-analog conversion digital signal is converted to standard 4 ~ 20mA current signal on the other hand, being used for long-range secondary instrument demonstration and PLC gathers, simultaneously also can be through the signal modulation, signal of communication is transmitted according to the HART agreement, be convenient to transmitter is carried out remote monitoring and maintenance.The user can select in above-mentioned three kinds of modes any one or more mode that density is measured according to on-the-spot service condition and actual conditions.The power supply of two-wire system provides not only easy-to-connect also to save installation cost.
The present invention compared with prior art has following advantage:
(1) output valve of Ji Suaning makes the output valve curve more level and smooth as the part of input value, avoids being fluctuateed in flow process and the accidental error that produces by liquid.
(2) two-wire system transducer of integral structure unites two into one sensor, transmitter, no-movable part, and wiring is simple, easy to maintenance.
(3) temperature compensator can reduce the influence of temperature variation to density greatly.
(4) on-line measurement continuously, no process is interrupted, and can be directly used in production run control.
(5) easy to install, insert liquid can be on two 4-digit number liquid crystal displays display density and temperature, need not regularly sampling and manually-operated.
(6) medium is wide, and intrinsic safety type can be used for hazardous environment, and hygiene-type can be installed on scenes such as food, medicine production.
Description of drawings
Fig. 1 is a theory diagram of the present invention
Fig. 2 is a shape assumption diagram of the present invention
Embodiment
Shown in Fig. 1-2: fluid closed loop type on-line liquid density test transmitter, mainly form by density probe and output display communication gauge outfit, it is characterized in that: the density probe is provided with accurate differential pressure pick-up and temperature sensor, have on the gauge outfit, temperature compensator, the density closed loop is calculated and the temperature compensation processor, LCD control system, data in real time display device and the interface of power supply is provided for transmitter, accurate differential pressure pick-up on the density probe links to each other with differential pressure sampling electronic circuit, the output signal of differential pressure sampling electronic circuit is sent into the density closed loop and is calculated and the temperature compensation processor, the density closed loop is calculated and the shows signal of temperature compensation processor is sent into display through LCD controller, the density closed loop is calculated and the output signal one tunnel of temperature compensation processor is exported 4 ~ 20mA standard signal through the D/A conversion, another road communicates signal through signal modulation circuit output according to the HART agreement, and the temperature compensated device of the sampled signal of temperature sensor is sent into the density closed loop and calculated and the temperature compensation processor.The mainboard of accurate differential pressure pick-up is a differential pressure sampling tablet, differential pressure sampling tablet adopts bridge circuit by two barrier film gaging pressures, two barrier films are 1# channel pressure diaphragm 1 and 2# channel pressure diaphragm 2, pressure passes through behind 1# channel pressure diaphragm 1 and the 2# channel pressure diaphragm 2 liquid transfer in the pipeline to be arrived in the accurate differential pressure pick-up, after accurate differential pressure pick-up was converted to electric signal with pressure signal, the differential pressure sampling electronic circuit that is input in the differential pressure sampling tablet was the readable signal of microprocessor board with electrical signal conversion; Temperature sensor is made up of the temperature compensator plate, and the temperature compensator plate is proofreaied and correct the linear error of environment temperature, non-pass amount error by triode and adjustable resistance, and the temperature value after the correction is sent to microprocessor board; The density closed loop is calculated with the temperature compensation processor plate and is connected with the temperature compensator plate with differential pressure sampling tablet by flat cable, the density closed loop is calculated and the temperature compensation processor plate comprises 80C196 microcontroller and PSD301 programmable peripheral device, user's configurable logic circuit is arranged on the PSD301, the internal lock storage, programmable address decoder, the I/O port, EPROM and SRAM, (PSD301 is with user's configurable logic circuit to comprise 80C196 microcontroller and PSD301 programmable peripheral device, the internal lock storage, programmable address decoder, the I/O port, on all integrated device of EPROM and SRAM, make the transmitter volume littler, integrated level is higher), can outputting standard 4 ~ 20mA current signal.Comprise that simultaneously power circuit gives system's other parts power supply, also have the communication hardware of forming by communication conveyer and line driver/receiver, feeds of data is controlled net to production run according to the HART agreement.LCD panel is connected by flat cable with processor plate, and density after handling and temperature data are shown on two 4-digit number LCD.Profile knot of the present invention is: the density probe is the microscler body of rod; 2# channel pressure diaphragm 2 is arranged on the body of rod of density probe bottom; 1# channel pressure diaphragm 1 is arranged on the body of rod on 2# channel pressure diaphragm 2 tops; on the body of rod between 1# channel pressure diaphragm 1 and the 2# channel pressure diaphragm 2, temperature sensor 4 is set; the density probe is provided with protection sealed tube 3; joint flange 5 is arranged at the top of density probe; on joint flange 5 tops differential pressure pick-up and differential pressure pick-up protective sleeve 6 are installed, LCDs 7 is installed on the differential pressure pick-up protective sleeve 6.
As mentioned above: the present invention's design is made up of four mainboards, first mainboard is differential pressure sampling tablet, adopt bridge circuit by two barrier film gaging pressures, pressure by 1# and 2# channel pressure diaphragm after in the pipeline liquid transfer in accurate differential pressure pick-up, after accurate differential pressure pick-up was converted to electric signal with pressure signal, the differential pressure sampling electronic circuit in the tablet was the readable signal of microprocessor board with electrical signal conversion.
Second block of plate is the temperature compensator plate, by triode and adjustable resistance the linear error of environment temperature, non-pass amount error proofreaied and correct, and the temperature value after the correction is sent to microprocessor board.
The 3rd block of plate calculates and the temperature compensation processor plate for the density closed loop, processor plate is connected with the temperature compensator plate with differential pressure sampling tablet by flat cable, output signal is analyzed, calculate, this plate is the core of whole transmitter, (PSD301 is with user's configurable logic circuit to comprise 80C196 microcontroller and PSD301 programmable peripheral device, the internal lock storage, programmable address decoder, the I/O port, on all integrated device of EPROM and SRAM, make the transmitter volume littler, integrated level is higher), (PSD301 is with user's configurable logic circuit to comprise 80C196 microcontroller and PSD301 programmable peripheral device, the internal lock storage, programmable address decoder, the I/O port, on all integrated device of EPROM and SRAM, make the transmitter volume littler, integrated level is higher), can outputting standard 4 ~ 20mA current signal.Comprise that simultaneously power circuit gives system's other parts power supply, also have the communication hardware of forming by communication conveyer and line driver/receiver, feeds of data is controlled net to production run according to the HART agreement.
The 4th block of plate is LCD panel, and it is connected by flat cable with processor plate, and density after handling and temperature data are shown on two 4-digit number LCD.
Above-mentioned four surface-mounted integrated circuits are installed in the gauge outfit, and whole transmitter is lumped together.
Claims (3)
1, fluid closed loop type on-line liquid density test transmitter, mainly form by density probe and output display communication gauge outfit, it is characterized in that: the density probe is provided with accurate differential pressure pick-up and temperature sensor, have on the gauge outfit, temperature compensator, the density closed loop is calculated and the temperature compensation processor, LCD control system, data in real time display device and the interface of power supply is provided for transmitter, accurate differential pressure pick-up on the density probe links to each other with differential pressure sampling electronic circuit, the output signal of differential pressure sampling electronic circuit is sent into the density closed loop and is calculated and the temperature compensation processor, the density closed loop is calculated and the shows signal of temperature compensation processor is sent into display through LCD controller, the density closed loop is calculated and the output signal one tunnel of temperature compensation processor is exported 4 ~ 20mA standard signal through the D/A conversion, another road communicates signal through signal modulation circuit output according to the HART agreement, and the temperature compensated device of the sampled signal of temperature sensor is sent into the density closed loop and calculated and the temperature compensation processor.
2, fluid closed loop type on-line liquid density test transmitter according to claim 1, it is characterized in that: the mainboard of accurate differential pressure pick-up is a differential pressure sampling tablet, differential pressure sampling tablet adopts bridge circuit by two barrier film gaging pressures, two barrier films are 1# channel pressure diaphragm (1) and 2# channel pressure diaphragm (2), pressure passes through behind 1# channel pressure diaphragm (1) and the 2# channel pressure diaphragm (2) liquid transfer in the pipeline to be arrived in the accurate differential pressure pick-up, after accurate differential pressure pick-up was converted to electric signal with pressure signal, the differential pressure sampling electronic circuit that is input in the differential pressure sampling tablet was the readable signal of microprocessor board with electrical signal conversion;
Temperature sensor is made up of the temperature compensator plate, and the temperature compensator plate is proofreaied and correct the linear error of environment temperature, non-pass amount error by triode and adjustable resistance, and the temperature value after the correction is sent to microprocessor board;
The density closed loop is calculated with the temperature compensation processor plate and is connected with the temperature compensator plate with differential pressure sampling tablet by flat cable, the density closed loop is calculated and the temperature compensation processor plate comprises 80C196 microcontroller and PSD301 programmable peripheral device, PSD301 is with user's configurable logic circuit, the internal lock storage, programmable address decoder, the I/O port, on all integrated device of EPROM and SRAM, exportable standard 4 ~ 20mA current signal, the communication hardware of forming by communication conveyer and line driver/receiver, according to the HART agreement feeds of data is controlled net to production run
LCD panel is connected by flat cable with processor plate, and density after handling and temperature data are shown on two 4-digit number LCD.
3; fluid closed loop type on-line liquid density test transmitter according to claim 2; it is characterized in that: the density probe is the microscler body of rod; 2# channel pressure diaphragm (2) is arranged on the body of rod of density probe bottom; 1# channel pressure diaphragm (1) is arranged on the body of rod on 2# channel pressure diaphragm (2) top; on the body of rod between 1# channel pressure diaphragm (1) and the 2# channel pressure diaphragm (2), temperature sensor (4) is set; the density probe is provided with protection sealed tube (3); joint flange (5) is arranged at the top of density probe; on joint flange (5) top differential pressure pick-up and differential pressure pick-up protective sleeve (6) are installed, differential pressure pick-up protective sleeve (6) is gone up LCDs (7) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100549140A CN101271054A (en) | 2008-04-30 | 2008-04-30 | Fluid closed loop type on-line liquid density transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100549140A CN101271054A (en) | 2008-04-30 | 2008-04-30 | Fluid closed loop type on-line liquid density transmitter |
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| CN101271054A true CN101271054A (en) | 2008-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100549140A Pending CN101271054A (en) | 2008-04-30 | 2008-04-30 | Fluid closed loop type on-line liquid density transmitter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308424A (en) * | 2013-06-30 | 2013-09-18 | 唐山三友氯碱有限责任公司 | Method for sodium hypochlorite density measurement and process control in chlorine recycle |
| CN105203429A (en) * | 2014-06-25 | 2015-12-30 | 天津海科信达石油技术有限公司 | Slurry density sensor |
| CN108758329A (en) * | 2018-06-19 | 2018-11-06 | 沈阳科汇生产力促进中心有限公司 | Filling machine, aerating statistical method, tax control filling machine and aerating tax control method |
| CN113484188A (en) * | 2021-06-29 | 2021-10-08 | 浙江交通职业技术学院 | Method and device for measuring density of emulsified asphalt liquid |
| CN115436223A (en) * | 2022-08-24 | 2022-12-06 | 武汉润达中控自动化工程有限公司 | Method and device for detecting density of feed liquid in container and solid content in feed liquid |
-
2008
- 2008-04-30 CN CNA2008100549140A patent/CN101271054A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308424A (en) * | 2013-06-30 | 2013-09-18 | 唐山三友氯碱有限责任公司 | Method for sodium hypochlorite density measurement and process control in chlorine recycle |
| CN103308424B (en) * | 2013-06-30 | 2015-12-23 | 唐山三友氯碱有限责任公司 | Sodium hypochlorite density measure during chlorine reclaims and course control method for use |
| CN105203429A (en) * | 2014-06-25 | 2015-12-30 | 天津海科信达石油技术有限公司 | Slurry density sensor |
| CN108758329A (en) * | 2018-06-19 | 2018-11-06 | 沈阳科汇生产力促进中心有限公司 | Filling machine, aerating statistical method, tax control filling machine and aerating tax control method |
| CN113484188A (en) * | 2021-06-29 | 2021-10-08 | 浙江交通职业技术学院 | Method and device for measuring density of emulsified asphalt liquid |
| CN115436223A (en) * | 2022-08-24 | 2022-12-06 | 武汉润达中控自动化工程有限公司 | Method and device for detecting density of feed liquid in container and solid content in feed liquid |
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Open date: 20080924 |