CN102322897A - Intelligent slurry density and liquid level integrative analysis instrument and analysis method - Google Patents
Intelligent slurry density and liquid level integrative analysis instrument and analysis method Download PDFInfo
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- CN102322897A CN102322897A CN201110249996A CN201110249996A CN102322897A CN 102322897 A CN102322897 A CN 102322897A CN 201110249996 A CN201110249996 A CN 201110249996A CN 201110249996 A CN201110249996 A CN 201110249996A CN 102322897 A CN102322897 A CN 102322897A
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Abstract
The invention provides an intelligent slurry density and liquid level integrative analysis instrument and an analysis method. Two pressure sensors with different depths are utilized for collecting pressure data of slurry at different depths to a first microcontroller, the first microcontroller obtains slurry density digital signals and liquid level digital signals through the calculation according to the height differences between the pressure sensors and the pressure data obtained by the two pressure sensors, the slurry density digital signals and the liquid level digital signals are transmitted to a display to be displayed, simultaneously, the density digital signal values are converted into density analog signals to be output through a first power supply module, a second microcontroller receives liquid level digital signals from the first microcontroller, and the liquid level digital signals are converted into liquid level analog signals to be output through a second power supply module. The density and liquid level double-parameter integral measurement is realized, the digital quantity is directly output and displayed, the measurement cost is reduced, convenience and feasibility are realized, the pressure sensor sensing is adopted, the pressure difference and the height are utilized for calculating the density value, a radioactive isotope densimeter is replaced, and the harm to human bodies caused by radioactive substances is avoided.
Description
Technical field
The present invention relates to a kind of intelligent serum density liquid level synthesis analyzer and analytical approach, be used for the measurement of all kinds of serum densities, liquid level.
Background technology
At present, common liquidensitometer kind has float type densimeter, static pressure type densitometer, teletransmission differential pressure densimeter, vibrating densimeter and radioisotope densimeter.
The float type densimeter principle of work is: the buoyancy that object receives in fluid is relevant with fluid density, and the big more buoyancy of fluid density is big more.Static pressure type densitometer principle of work is: the static pressure of certain altitude fluid column is directly proportional with this density of liquid, therefore can weigh density of liquid according to the static pressure numerical value that pressure measuring instruments is measured.Bellows (seeing diaphragm and diaphragm capsule) is a kind of pressure measuring element commonly used, is called bellows static pressure type densitometer with the densitometer of its direct measuring samples fluid column static pressure.What another kind was commonly used is single tube air blowing type densitometer; It replaces directly measuring fluid column pressure to measure air pressure; Gas blow pipe is inserted the following certain depth of fluid to be measured liquid level; Pressurized air is constantly overflowed from the pipe end through gas blow pipe, and the pressure of inner air tube just equals the pressure of the sample fluid column of that section height at this moment, and force value can be converted into density.The vibrating densimeter principle of work is: object is excited and when vibrating; Its vibration frequency or amplitude are relevant with the quality of object itself; If in object, fill fluid sample, just then its vibration frequency or oscillation amplitude change reflect the quality or the density of the sample liquids of certain volume with certain volume.Be provided with the radioactive isotope radiation source in the radioisotope densimeter instrument; Its radioactive radiation (for example gamma-rays); After seeing through certain thickness sample, received by ray detector; Certain thickness sample is relevant with the density of this sample to the uptake of ray, and the signal of ray detector is then relevant with this uptake, therefore reflects the density of sample.
Above-mentioned densitometric shortcoming is that non-repeatability is big, lag error big, receives the uncertain big of influence of temperature change.
Summary of the invention
The technical matters that the present invention will solve is: a kind of intelligent serum density liquid level synthesis analyzer is provided, can density, the two-parameter integrated measurement of liquid level, and the output of Direct Digital amount.
The present invention solves the problems of the technologies described above the technical scheme of being taked to be: a kind of intelligent serum density liquid level synthesis analyzer, and it is characterized in that: it comprises mechanical part and circuit part;
Described mechanical part comprises housing and first body, second body that are uneven in length and are parallel to each other; Housing is connected with an end of first body, second body respectively through flange, and the other end of first body, second body connects first probe and second probe respectively;
Described circuit part comprises first signal acquiring system, secondary signal acquisition system, signal processing system, display and supply module; First signal acquiring system and secondary signal acquisition system are electrically connected with signal processing system respectively, and signal processing system is electrically connected with display, and signal processing system is through supply module output density value and level value;
Described first signal acquiring system and secondary signal acquisition system are separately positioned in first probe and second probe; Described signal processing system, display and supply module are arranged in the housing.
Press such scheme, described first signal acquiring system comprises the pressure transducer that model is identical with second acquisition system.
Press such scheme, described pressure transducer comprises and the extraneous pressure experience end face that communicates, seals through 0 RunddichtringO between pressure experience end face and the probe.
Press such scheme, described signal processing system comprises the first microprocessor and second microprocessor, and described supply module comprises first supply module and second supply module; Wherein said first signal acquiring system and secondary signal acquisition system are electrically connected with the input end of first microprocessor, and first microprocessor is electrically connected with said display; First microprocessor is connected through the HART communication module with first supply module, and second microprocessor is connected through the HART communication module with second supply module, is connected through the RS232 serial ports between first microprocessor and second microprocessor.
Press such scheme, the input end of described first microprocessor is electrically connected with input equipment.
A kind of intelligent serum density liquid level comprehensive analysis method, it is characterized in that: it may further comprise the steps:
1) 2 signal acquiring systems not waiting of degree of depth pressure data of gathering the slurries different depths is passed to first microcontroller;
2) pressure data that obtains according to 2 signal acquiring systems of first microcontroller and the difference in height between the signal acquiring system density figures signal and the liquid level digital signal that calculate slurries; Be sent to display and show, transfer the density figures signal value to the density simulating signal through the output of first supply module simultaneously;
3) second microcontroller receives the liquid level digital signal from first microcontroller, transfers the liquid level digital signal to the liquid level simulating signal through the output of second supply module.
When gathering pressure data, gather 2 signal acquiring systems of described step 1) corresponding temperature data; Described step 2) first microprocessor obtains the zero shift data that pressure following temperature changes according to pressure data of gathering and corresponding temperature data; Adopt the piecewise linear interpolation method to obtain the zero shift penalty function that pressure following temperature changes, utilize the zero shift function that pressure data is carried out the zero shift compensation.
Principle of work of the present invention is: utilize static pressure method principle Δ P=ρ g Δ h, realize density measure through the detected pressures difference; Wherein Δ P is the difference (P that two sensors bear pressure
2-P
1); ρ is the density value of measured medium; G is an acceleration of gravity; Δ h is 2 distances between the signal acquiring system.Utilize density value to pass through formula again
Calculate, realize the measurement of liquid level; P
2Pressure data for darker sensor acquisition; ρ is the density value of measured medium, is recorded by static pressure method; G is an acceleration of gravity.
Beneficial effect of the present invention is:
1, possess density, the two-parameter integrated measurement of liquid level, the output of Direct Digital amount shows, has reduced the measurement cost, and is convenient feasible.
2, adopts pressure sensor sensing is utilized pressure differential and high computational density value, substitutes radioisotope densimeter, has avoided the harm of radioactive material confrontation human body.
Description of drawings
Fig. 1 is the mechanical construction drawing of one embodiment of the invention.
Fig. 2 is the schematic block circuit diagram of one embodiment of the invention.
Fig. 3 is the density current loop circuit schematic diagram of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment invention is further specified.
Fig. 1 is the mechanical construction drawing of one embodiment of the invention, comprises housing 1 and first body 7, second body 4 that are uneven in length and are parallel to each other; Housing 1 is connected with an end of first body 7, second body 4 respectively through flange 3, and the other end of first body 7, second body 4 connects first probe 6 and second respectively and pops one's head in 5.In order to make housing 1 better be connected, between housing 1 and flange 3, set up web member 2 with flange 3.During measurement, first probe, 6 and second probe 5 is inserted slurries.
Fig. 2 is the schematic block circuit diagram of one embodiment of the invention, comprises first signal acquiring system, secondary signal acquisition system, signal processing system, LCD display and supply module; First signal acquiring system and secondary signal acquisition system are electrically connected with signal processing system respectively, and signal processing system is electrically connected with LCD display, and signal processing system is through supply module output density value and level value.First signal acquiring system and secondary signal acquisition system are separately positioned in first probe and second probe; Described signal processing system, LCD display and supply module are arranged in the housing.
First signal acquiring system comprises the pressure transducer that model is identical with second acquisition system.Pressure transducer comprises and the extraneous pressure experience end face that communicates, seals through 0 RunddichtringO between pressure experience end face and the probe.Pressure transducer adopts unique packaging technology after strictness screening pairing, make the pressure curve of two sensitive elements, temperature curve almost completely consistent, experiences slurries pressure and changes, and produces the corresponding simulating electric signal.
Signal processing system comprises the first microprocessor and second microprocessor, and described supply module comprises first supply module and second supply module; Wherein said first signal acquiring system and secondary signal acquisition system are electrically connected with the input end of first microprocessor, and first microprocessor is electrically connected with said LCD display; First microprocessor is electrically connected through the HART communication module with first supply module, and second microprocessor is electrically connected through the HART communication module with second supply module, is connected through the RS232 serial ports between first microprocessor and second microprocessor.
The input end of first microprocessor is electrically connected with input equipment, and the input equipment in the present embodiment is a Keysheet module.
Communicate by letter 2 modules, Keysheet module, storer EEPEOM1 and first sensor, second sensor of first supply module, a DCDC module, first microprocessor, LCD display, HART formed the density electric current loop, and be as shown in Figure 3.First supply module is that density electric current loop each several part supplies the 3.3V direct current through a DCDC module.First microprocessor is to the pressure signal of 2 sensor acquisition; According to static pressure method principle Δ P=ρ g Δ h; The analog electrical signal that signal acquiring system is transmitted is through Digital Signal Processing, and the first microprocessor real time temperature value through the pressure transducer collection again obtains the zero shift data that pressure following temperature changes and carries out temperature compensation.Calculate the density figures signal and the liquid level digital signal of slurries through density value through formula
again, and be sent to LCD display simultaneously and show.The density figures signal produces 4～20mA density simulating signal through electric current loop; The liquid level digital signal is sent to second microprocessor through 232 serial ports.
Communicate by letter 1 module and storer EEPEOM2 of second supply module, the 2nd DCDC module, second microprocessor, HART forms the liquid level electric current loop, between annexation identical with the annexation that first supply module, a DCDC module, first microprocessor, HART communicate by letter between 2 modules, the storer EEPEOM1.Second microprocessor transfers the liquid level digital signal to the liquid level simulating signal, through the output of second supply module.
In Fig. 3 density electric current loop schematic diagram, single-chip microcomputer U4 (being first microprocessor), pin one 8 links to each other with the SV+ of first sensor through resistance R 25; Pin one 9 links to each other through the SV2+ of resistance R 26 with second sensor, and pin two 0 links to each other with the SS+ of first sensor, and pin two 1 links to each other with the SS-of first sensor; Pin two 2 links to each other with the ST of first sensor; Pin two 3 links to each other with the SS2+ of second sensor, and pin two 4 links to each other with the SS2-of second sensor, and pin two 5 links to each other with the ST2 of second sensor.
Single-chip microcomputer U4; Pin 44, pin 55, pin 56, pin 3, pin 4 are connected with connection terminal P4,232 communications, 1 module; And send above-mentioned density figures signal and liquid level digital signal to LCD display, and the liquid level digital signal is sent to second microprocessor through 232 communications, 1 module, 232 communications, 2 modules.
Single-chip microcomputer U4, pin 6, pin 7, pin 8 are connected with pin 5, pin 6, the pin 7 of electric current loop chip U2 respectively, accomplish the transmission of density figures signal; Single-chip microcomputer U4, pin 59, pin 60, pin 63 are connected with pin two 5, pin two 3, the pin two 6 of Hart special chip U1 respectively, accomplish the Hart communication of density figures signal.
Single-chip microcomputer U4, pin 52, pin 53, pin 54 are connected with Keysheet module respectively, can carry out the on-site parameters setting through button, or accomplish the passive demarcation at zero point; Single-chip microcomputer U4, pin 51 is connected with the pin 7 of storer U3, reads and writes parameters such as density, liquid level scope, pressure transducer range, output electric signal scope in real time.
Single-chip microcomputer U4 pin the 52,53, the 54th meets power supply VCC through resistance R 13, R14, R15, and this node is connected to ground through the serial connection keyswitch, when no button is pressed, is high level, is low level when button is pressed.Single-chip microcomputer U4 judges keyboard signal through high-low level.
Electric current loop chip U2 is connected with Q1, produces 4～20mA density simulating signal.First supply module mainly is made up of P1, D1, D2, D3, F1, F2, Z1, PU1, PU2 etc., for entire circuit provides working power.The D3 Transient Voltage Suppressor is prevented thunder and lightning.F1, F2, Z1 form transformer, isolate with external power physics magnetic.
PU1---TPS79733:10mA, the little power consumption LDO voltage stabilizer of 3.3V.
The input transient voltage that PU2---LTC3642 high-level efficiency, high voltage, 50mA synchronous buck converter characteristics wide input voltage range: 4.5V to 45V can bear 60V has the internal high pressure side and the low-pressure side power switch need not to compensate the operation of 50mA output current low pressure differential: 100% dutycycle low quiescent current: 12 μ A 0.8V feedback voltage benchmark.
U5, U6---ADR5041 precision, little power consumption, shunt mode reference voltage source, have low temperature drift, be superior to 0.1% initial precision and fast Time Created characteristic.
In order to access data result more accurately; Described first, second signal acquiring system comprises digital temperature sensor respectively; When recording pressure data, obtain corresponding temperature data; First microprocessor obtains the zero shift data that pressure following temperature changes according to pressure data of gathering and corresponding temperature data, adopts the piecewise linear interpolation method to obtain the zero shift penalty function that pressure following temperature changes, and utilizes the zero shift function that pressure data is carried out the zero shift compensation.
Claims (7)
1. intelligent serum density liquid level synthesis analyzer, it is characterized in that: it comprises mechanical part and circuit part;
Described mechanical part comprises housing and first body, second body that are uneven in length and are parallel to each other; Housing is connected with an end of first body, second body respectively through flange, and the other end of first body, second body connects first probe and second probe respectively;
Described circuit part comprises first signal acquiring system, secondary signal acquisition system, signal processing system, display and supply module; First signal acquiring system and secondary signal acquisition system are electrically connected with signal processing system respectively, and signal processing system is electrically connected with display, and signal processing system is through supply module output density value and level value;
Described first signal acquiring system and secondary signal acquisition system are separately positioned in first probe and second probe; Described signal processing system, display and supply module are arranged in the housing.
2. intelligent serum density liquid level synthesis analyzer according to claim 1, it is characterized in that: described first signal acquiring system comprises the pressure transducer that model is identical with second acquisition system.
3. intelligent serum density liquid level synthesis analyzer according to claim 2 is characterized in that: described pressure transducer comprises and the extraneous pressure experience end face that communicates, seals through the O RunddichtringO between pressure experience end face and the probe.
4. according to claim 1 or 2 or 3 described intelligent serum density liquid level synthesis analyzers; It is characterized in that: described signal processing system comprises the first microprocessor and second microprocessor, and described supply module comprises first supply module and second supply module; Wherein said first signal acquiring system and secondary signal acquisition system are electrically connected with the input end of first microprocessor, and first microprocessor is electrically connected with said display; First microprocessor is connected through the HART communication module with first supply module, and second microprocessor is connected through the HART communication module with second supply module, is connected through the RS232 serial ports between first microprocessor and second microprocessor.
5. intelligent serum density liquid level synthesis analyzer according to claim 4, it is characterized in that: the input end of described first microprocessor is electrically connected with input equipment.
6. intelligent serum density liquid level comprehensive analysis method, it is characterized in that: it may further comprise the steps:
1) 2 signal acquiring systems not waiting of degree of depth pressure data of gathering the slurries different depths is passed to first microcontroller;
2) pressure data that obtains according to 2 signal acquiring systems of first microcontroller and the difference in height between the signal acquiring system density figures signal and the liquid level digital signal that calculate slurries; Be sent to display and show, transfer the density figures signal value to the density simulating signal through the output of first supply module simultaneously;
3) second microcontroller receives the liquid level digital signal from first microcontroller, transfers the liquid level digital signal to the liquid level simulating signal through the output of second supply module.
7. intelligent serum density liquid level comprehensive analysis method according to claim 6 is characterized in that: gather corresponding temperature data when 2 signal acquiring systems of described step 1) are gathered pressure data;
Described step 2) first microprocessor obtains the zero shift data that pressure following temperature changes according to pressure data of gathering and corresponding temperature data; Adopt the piecewise linear interpolation method to obtain the zero shift penalty function that pressure following temperature changes, utilize the zero shift function that pressure data is carried out the zero shift compensation.
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| CN201110249996A CN102322897A (en) | 2011-08-27 | 2011-08-27 | Intelligent slurry density and liquid level integrative analysis instrument and analysis method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102778255A (en) * | 2012-07-12 | 2012-11-14 | 西安交通大学 | High-precision liquid level, temperature, density multifunctional measuring system |
| CN105588784A (en) * | 2014-10-23 | 2016-05-18 | 北京纳米能源与系统研究所 | A continuous measurement device for liquid densities |
| CN106442910A (en) * | 2016-10-11 | 2017-02-22 | 和舆图（北京）科技有限公司 | Automatic underground water monitoring system |
| CN107941417A (en) * | 2017-11-10 | 2018-04-20 | 苏州华兴源创电子科技有限公司 | The output calibrating installation and method of a kind of pressure sensor |
| CN109632041A (en) * | 2019-01-23 | 2019-04-16 | 黑河学院 | It is a kind of to detect accurate natural calamity detection device and its detection method |
| CN110160913A (en) * | 2019-06-24 | 2019-08-23 | 南方科技大学 | Liquid densimeter and liquid density measurement system |
| CN111595725A (en) * | 2020-06-26 | 2020-08-28 | 顺德职业技术学院 | Liquid measuring method and measuring system |
| CN112683732A (en) * | 2020-12-19 | 2021-04-20 | 西安西热控制技术有限公司 | Method for measuring density of desulfurized limestone slurry of thermal power plant |
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| CN111595725A (en) * | 2020-06-26 | 2020-08-28 | 顺德职业技术学院 | Liquid measuring method and measuring system |
| CN112683732A (en) * | 2020-12-19 | 2021-04-20 | 西安西热控制技术有限公司 | Method for measuring density of desulfurized limestone slurry of thermal power plant |
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Application publication date: 20120118 |