CN105067038A - Multi-parameter density/ liquid level instrument and manufacture method thereof - Google Patents
Multi-parameter density/ liquid level instrument and manufacture method thereof Download PDFInfo
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- CN105067038A CN105067038A CN201510485685.8A CN201510485685A CN105067038A CN 105067038 A CN105067038 A CN 105067038A CN 201510485685 A CN201510485685 A CN 201510485685A CN 105067038 A CN105067038 A CN 105067038A
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- density
- pressure transducer
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- pressure
- measuring staff
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Abstract
The invention discloses a multi-parameter density/ liquid level instrument designed through the pressure and differential pressure principle. The multi-parameter density/ liquid level instrument comprises a plurality of pressure sensors, a temperature sensor, a measuring rod, an installation flange and an intelligent gauge head. The intelligent gauge head is internally provided with a conditioning circuit, a multi-channel AD converting circuit and a CPU intelligent processing unit. The plurality of pressure sensors and the temperature sensor are connected with the signal conditioning circuit through signal lines in the measuring rod; the signal conditioning circuit is connected with the multi-channel AD converting circuit; the multi-channel AD converting circuit is connected with the CPU intelligent processing unit; the CPU intelligent processing unit obtains density of the liquid through pressure measured by the first pressure sensor and the second pressure sensor. The multi-parameter density/ liquid level instrument is placed into a baking oven for temperature compensation in the manufacturing process. The pressure measured by the plurality of pressure sensors adopts least-square linear fitting; and the temperature measured by the temperature sensor adopts a three-dimensional curved surface temperature compensating algorithm for correction.
Description
technical field:
The present invention relates to liquid measure instrument, be specifically related to a kind of multiparameter density/tank gage and its manufacture method.
background technology:
On current domestic and international market, the Density Measuring Instrument/tank gage of single parameter can only be manufactured by differential pressure or pressure principle, there is no the Density Measuring Instrument/tank gage of the multiparameters such as simultaneously tracer liquid density, liquid level, pressure and temperature.As needed measuring media density, liquid level and temperature, 3 instrument must be adopted simultaneously to coordinate and to realize.So, cost can increase much undoubtedly, and the volume of installation and space also require very high.Density Measuring Instrument/the tank gage of the multiple parameter of this integrated measuring still belongs to blank in market at home and abroad.
summary of the invention:
The present invention adopt two independently pressure transducer measure pressure simultaneously, be designated as P1 and P2 respectively, mutually difference is done by the force value that two pressure transducers record, differential pressure value DP=P1-P2 can be obtained, the spacing of two pressure transducers is H is known fixed, and therefore the density of measured medium is ρ=(P1-P2)/gH.Force value is have also been obtained while measuring, according to force value and the density value calculated, the liquid level then measuring medium is h=P1/g ρ, well solving existing product utilizes differential pressure pick-up to record differential pressure value, and can not get the embarrassment of force value, also solving existing throw-in type tank gage on market can not the change of real time reaction Media density and the measuring error that causes, adding built-in temperature sensor can simultaneously measuring media temperature, easily realizes the task that an instrument completes three instrument.Each pressure transducer adopts least-squares algorithm linear fitting technology simultaneously, and three-dimension curved surface temperature compensation calculates, and perfectly the temperature error of sensor and linear error is revised by software calculating, further increases the degree of accuracy of instrument measurement.
Technical scheme of the present invention is as follows:
A kind of multiparameter density/tank gage, comprises the first pressure transducer, temperature sensor, the second pressure transducer, measuring staff, mounting flange, intelligent gauge outfit; In intelligence gauge outfit, the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal conditioning circuit, hyperchannel A/D convertor circuit and CPU intelligent processing unit are set; First pressure transducer, temperature sensor and the second pressure transducer connect the first signal conditioning circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit respectively by the signal wire in side lever; First signal conditioning circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit connecting multi-channel A/D convertor circuit, hyperchannel A/D convertor circuit connects CPU intelligent processing unit; CPU intelligent processing unit obtains the density of liquid by the pressure that the first pressure transducer and the second pressure transducer measure.
Further, the first pressure transducer, temperature sensor, the second pressure transducer, signal conditioning circuit, hyperchannel A/D convertor circuit, CPU intelligent processing unit and gauge outfit are put into baking oven in the fabrication process and are done temperature compensation.
Further, multiparameter density/tank gage of the present invention also comprises the LCD display unit, 4 ~ 20mA output unit, digital communication unit, parameter storage unit and the button that are connected with CPU intelligent processing unit.
Further, the pressure that the first pressure transducer, the second pressure transducer measure adopts least-squares algorithm linear fitting, and the temperature that temperature sensor measures adopts three-dimension curved surface temperature compensation algorithm to revise.
Further, the one the second pressure transducers are arranged on measuring staff side, or are arranged on bottom measuring staff or are arranged on measuring staff inside.
Further, measuring staff shape is pipe, square tube or flat tube etc.
Further, measuring staff flexible pipe or sectional manufacture.
Invention also provides the manufacture method of above-mentioned multiparameter density/tank gage, its step is as follows:
1. processing and manufacturing mechanical structured member parts
The first-class mechanical structured member of processing and manufacturing probe socket, protective cover, measuring staff, flange, meter base, instrument;
2. welding structural element
The structural members such as probe socket, flange, meter base are welded on measuring staff, complete the making of measuring staff assembly;
3. leakage test
With gas leakage detector, sealing test is done to measuring staff assembly, detect the sealing property of each solder joint;
4. wiring board is made
Make signal condition wiring board, A/D convertor circuit plate, CPU intelligent plate, LED display board;
5. wiring board is assembled
Each wiring board and namely plug-in unit be fitted into gauge outfit;
6. temperature compensation test
Connect the one the second pressure transducer and temperature sensors, put into baking oven together with each wiring board and gauge outfit and do temperature compensation test, and demarcate;
7. general assembly
Temperature compensation, demarcate qualified after, the one the second pressure transducers and temperature sensor and wiring board general assembly are entered in measuring staff assembly, complete the assembling of whole instrument;
8. always examine
The property indices of detecting instrument, labels, pastes conformity certification.
Below in conjunction with drawings and Examples, the present invention is further described.
accompanying drawing illustrates:
Fig. 1 is the structural drawing of multiparameter of the present invention density/tank gage;
Fig. 2 is the circuit diagram of multiparameter of the present invention density/tank gage.
In figure, 1 is the first pressure transducer; 2 is temperature sensor; 3 is the second pressure transducer; 4 is measuring staff; 5 is flange; 6 is intelligent gauge outfit; 11 is the first signal conditioning circuit; 12 is secondary signal modulate circuit; 13 is the 3rd signal conditioning circuit; 18 is hyperchannel A/D convertor circuit; 28 is CPU intelligent processing unit; 31 is LCD display unit; 32 is 4 ~ 20mA output unit; 33 is digital communication unit; 34 is parameter storage unit; 35 is button.
specific implementation method:
Figure 1 shows that the structural drawing of multiparameter of the present invention density/tank gage.As shown in Figure 1, multiparameter density/tank gage of the present invention comprises the first pressure transducer 1, temperature sensor 2, second pressure transducer 3, measuring staff 4, flange 5, intelligent gauge outfit 6.In intelligence gauge outfit 6, the first signal conditioning circuit 11, secondary signal modulate circuit 12, the 3rd signal conditioning circuit 13, hyperchannel A/D convertor circuit 18 and CPU intelligent processing unit 28. are set
Fig. 2 is the circuit diagram of multiparameter of the present invention density/tank gage.As shown in Figure 2, first pressure transducer 1, temperature sensor 2 and the second pressure transducer 3 connect the first signal conditioning circuit 11, secondary signal modulate circuit 12 and the 3rd signal conditioning circuit 13 respectively by the signal wire in side lever 4, first signal conditioning circuit 11, secondary signal modulate circuit 12 and the 3rd signal conditioning circuit 13 connecting multi-channel A/D convertor circuit 18, hyperchannel A/D convertor circuit 18 connects CPU intelligent processing unit 28.
CPU intelligent processing unit 28 obtains the density of liquid by the pressure that the first pressure transducer 1 and the second pressure transducer 3 measure.Its principle is as follows: the first pressure transducer 1 and the second pressure transducer 3 are measured pressure simultaneously and be designated as P1 and P2 respectively, mutually difference is done with P1 and P2, differential pressure value DP=P1-P2 can be obtained, the spacing H of the first pressure transducer 1 and the second pressure transducer 3 is fixed values, therefore density p=(the P1-P2)/gH of measured medium.
In order to improve the precision of multiparameter of the present invention density/tank gage, the first pressure transducer, temperature sensor, the second pressure transducer, wiring board, gauge outfit are put into baking oven in the fabrication process and are done temperature compensation.Measurement instrument generally all does temperature compensation test in baking oven, for the Density Measuring Instrument of length more than one meter and tank gage, because of the restriction of oven space, does temperature compensation very difficult.Instrument more than 2 meters of length then can not do temperature compensation test, and therefore the temperature coefficient of lengthening Density Measuring Instrument and tank gage is very poor in the market, precision is not high.And multiparameter Density Measuring Instrument and tank gage adopt is split-type structural, namely hardware and circuit device part are independently, survey sensor and circuit device integrate, after carrying out temperature compensation, integral installation is allocated in hardware, therefore multiparameter Density Measuring Instrument and tank gage when doing temperature compensation by the restriction of length, the scope of covering is from 1 meter until 30 meters.
As shown in Figure 2, multiparameter density/tank gage of the present invention also comprises the LCD aobvious 31 be connected with CPU intelligent processing unit 28 and shows unit, 4 ~ 20mA output unit 32, digital communication unit 33, parameter storage unit 34 and button 35.
In order to improve the accuracy of multiparameter of the present invention density/tank gage measured value, the pressure that first pressure transducer 1, second pressure transducer 3 measures adopts least-squares algorithm linear fitting, and the temperature that temperature sensor 2 measures adopts three-dimension curved surface temperature compensation algorithm to revise.
Multiparameter density/tank gage of the present invention, its probe can be arranged on the side of measuring staff 4, or is arranged on the bottom of measuring staff 4 or is arranged on the inside of measuring staff 4.
Multiparameter density/tank gage of the present invention, measuring staff 4 shape can for being pipe, square tube or flat tube etc.
Multiparameter density/tank gage of the present invention, what measuring staff 4 length was short directly can install manufacture with pipe, and what length was long can with flexible pipe or the assembly of segmentation measuring staff.
Invention also provides the manufacture method of above-mentioned multiparameter density/tank gage, its step is as follows:
1. processing and manufacturing mechanical structured member parts
The first-class mechanical structured member of processing and manufacturing probe socket, protective cover, measuring staff, flange, meter base, instrument;
2. welding structural element
The structural members such as probe socket, flange, meter base are welded on measuring staff, complete the making of measuring staff assembly;
3. leakage test
With gas leakage detector, sealing test is done to measuring staff assembly, detect the sealing property of each solder joint;
4. wiring board is made
Make signal condition wiring board, A/D convertor circuit plate, CPU intelligent plate, LED display board; ;
5. wiring board is assembled
Each wiring board and namely plug-in unit be fitted into gauge outfit;
6. temperature compensation test
Connect the one the second pressure transducer and temperature sensors, put into baking oven together with each wiring board and gauge outfit and do temperature compensation test, and demarcate;
7. general assembly
Temperature compensation, demarcate qualified after, the one the second pressure transducer, temperature sensor and wiring board general assemblies are entered in measuring staff assembly, complete the assembling of whole instrument;
8. always examine
The property indices of detecting instrument, labels, pastes conformity certification.
The performance index of multiparameter density/tank gage of the present invention are as follows:
1. range: density 0 ~ 3g/cm
3, liquid level 0.1 ~ 30.0m, temperature-40 ~ 100 DEG C, pressure 0 ~ 64MPa;
2. precision: density 0.1%, liquid level 0.1%, temperature 0.1 DEG C, pressure 0.1%;
3. input: 24VDC, output 4 ~ 20mA are with HART communication agreement or 485 to export;
4. working temperature :-40 ~ 100 DEG C.
5. mounting means: flange installation, screw thread installation, clip installation etc.
Utilize the technical scheme of multiparameter of the present invention density/tank gage, the measurement instrument as Types Below can be manufactured and designed:
Multiparameter Density Measuring Instrument;
Multiparameter densitometer;
Multiparameter proportion instrument;
Multiparameter picnometer;
Multiparameter density measurement/measuring instrument;
Multiparameter density measurement/meter;
Multiparameter specific weight determine/measuring instrument;
Multiparameter specific weight determine/meter;
Multiparameter tank gage;
Multiparameter liquid level gauge;
Multiparameter liquid level test/measuring instrument;
Multiparameter liquid level test/meter;
Multiparameter material level gauge;
Multiparameter level meter.
The installation and application of multiparameter density/tank gage of the present invention is as follows:
1. at the pipeline needing to install or tank body top drilling DN50/DN80, the flange base DN50/DN80 of welding 50mm ~ 100mm height, base welds companion flange, requires flange face level;
2. multiparameter Density Measuring Instrument/tank gage is inserted, with the fastening companion flange of bolt-connection, flange face density PTFE liner;
3. the liquid in emptying pipe or in tank body, access 24VDC power supply, according to keying method adjustment zero-bit;
4. pass into liquid normally to work, can direct reading.
5. power lead also as signal wire, can export the signal that 4-20mA is with HART agreement, or 485 signals.
More than show and describe the ultimate principle of invention, principal character and advantage.The claimed scope of this patent is defined by appending claims and equivalent thereof.
Claims (8)
1. multiparameter density/tank gage, is characterized in that comprising the first pressure transducer, temperature sensor, the second pressure transducer, measuring staff, mounting flange, intelligent gauge outfit; In intelligence gauge outfit, the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal conditioning circuit, hyperchannel A/D convertor circuit and CPU intelligent processing unit are set; First pressure transducer, temperature sensor and the second pressure transducer connect the first signal conditioning circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit respectively by the signal wire in side lever, first signal conditioning circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit connecting multi-channel A/D convertor circuit, hyperchannel A/D convertor circuit connects CPU intelligent processing unit; CPU intelligent processing unit obtains density and the liquid level of liquid by the pressure that the first pressure transducer and the second pressure transducer measure.
2. multiparameter density/tank gage as claimed in claim 1, the first pressure transducer, temperature sensor, the second pressure transducer, wiring board, gauge outfit are put into baking oven in the fabrication process and are done temperature compensation.
3. multiparameter density/tank gage as claimed in claim 1, also comprises the LCD display unit, 4 ~ 20mA output unit, digital communication unit, parameter storage unit and the button that are connected with CPU intelligent processing unit.
4. multiparameter density/tank gage as claimed in claim 2, also comprises the LCD display unit, 4 ~ 20mA output unit, digital communication unit, parameter storage unit and the button that are connected with CPU intelligent processing unit.
5. the multiparameter density/tank gage as described in claim as arbitrary in claim 1-4, the pressure that first pressure transducer, the second pressure transducer measure adopts least-squares algorithm linear fitting, and the temperature that temperature sensor measures adopts three-dimension curved surface temperature compensation algorithm to revise.
6. the multiparameter density/tank gage as described in claim as arbitrary in claim 1-4, measuring staff shape is pipe, square tube or flat tube.
7. multiparameter density/tank gage, measuring staff flexible pipe or sectional manufacture as described in claim as arbitrary in claim 1-4.
8. a manufacture method for the multiparameter density/tank gage described in the arbitrary claim of claim 1-7, it is characterized in that, its step is as follows:
1. processing and manufacturing mechanical structured member parts
Each mechanical structured member of processing and manufacturing probe socket, protective cover, measuring staff, flange, meter base, gauge outfit;
2. welding structural element
Probe socket, flange, meter base are welded on measuring staff, complete the making of measuring staff assembly;
3. leakage test
With gas leakage detector, sealing test is done to measuring staff assembly, detect the sealing property of each solder joint;
4. wiring board is made
Make signal condition wiring board, A/D convertor circuit plate, CPU intelligent plate, LED display board;
5. wiring board is assembled
Each wiring board and namely plug-in unit be fitted into gauge outfit;
6. temperature compensation test
Connect the one the second pressure transducer and temperature sensors, put into baking oven together with each wiring board and gauge outfit and do temperature compensation test, and demarcate;
7. general assembly
Temperature compensation, demarcate qualified after, the one the second pressure transducers and temperature sensor and wiring board general assembly are entered in measuring staff assembly, complete the assembling of whole instrument;
8. always examine
The property indices of detecting instrument, labels, pastes conformity certification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510485685.8A CN105067038A (en) | 2015-08-10 | 2015-08-10 | Multi-parameter density/ liquid level instrument and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510485685.8A CN105067038A (en) | 2015-08-10 | 2015-08-10 | Multi-parameter density/ liquid level instrument and manufacture method thereof |
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| Publication Number | Publication Date |
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| CN105067038A true CN105067038A (en) | 2015-11-18 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510485685.8A Pending CN105067038A (en) | 2015-08-10 | 2015-08-10 | Multi-parameter density/ liquid level instrument and manufacture method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643100A (en) * | 2016-07-21 | 2018-01-30 | 西安定华电子股份有限公司 | A kind of tank car Integrated Measurement System that can efficiently judge leakage |
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| DE4404053A1 (en) * | 1994-02-09 | 1995-08-10 | Volker Schmidt | Controller for rainwater tanks, prevents the pump running dry and overfilling |
| CN1256404A (en) * | 1999-12-11 | 2000-06-14 | 华南师范大学 | Liquid level measuring instrument and its error compensation method |
| JP3600171B2 (en) * | 2001-03-07 | 2004-12-08 | 株式会社 拓和 | Liquid pressure measurement sensor and water level measurement device |
| CN102032974A (en) * | 2010-11-15 | 2011-04-27 | 浙江工商大学 | Temperature compensation method for pressure sensor |
| CN102103001A (en) * | 2009-12-18 | 2011-06-22 | 中国电子科技集团公司第四十九研究所 | Method for manufacturing sensor for measuring liquid level of two-phase liquid |
| CN102778255A (en) * | 2012-07-12 | 2012-11-14 | 西安交通大学 | High-precision liquid level, temperature, density multifunctional measuring system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4404053A1 (en) * | 1994-02-09 | 1995-08-10 | Volker Schmidt | Controller for rainwater tanks, prevents the pump running dry and overfilling |
| CN1256404A (en) * | 1999-12-11 | 2000-06-14 | 华南师范大学 | Liquid level measuring instrument and its error compensation method |
| JP3600171B2 (en) * | 2001-03-07 | 2004-12-08 | 株式会社 拓和 | Liquid pressure measurement sensor and water level measurement device |
| CN102103001A (en) * | 2009-12-18 | 2011-06-22 | 中国电子科技集团公司第四十九研究所 | Method for manufacturing sensor for measuring liquid level of two-phase liquid |
| CN102032974A (en) * | 2010-11-15 | 2011-04-27 | 浙江工商大学 | Temperature compensation method for pressure sensor |
| CN102778255A (en) * | 2012-07-12 | 2012-11-14 | 西安交通大学 | High-precision liquid level, temperature, density multifunctional measuring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643100A (en) * | 2016-07-21 | 2018-01-30 | 西安定华电子股份有限公司 | A kind of tank car Integrated Measurement System that can efficiently judge leakage |
| CN113063465A (en) * | 2016-07-21 | 2021-07-02 | 西安定华电子股份有限公司 | Tank car comprehensive measurement system and method capable of judging leakage |
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| PB01 | Publication | ||
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Application publication date: 20151118 |