CN102279029A - Self-calibrating putting-into-type pressure liquid level meter and measuring method thereof - Google Patents
Self-calibrating putting-into-type pressure liquid level meter and measuring method thereof Download PDFInfo
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- CN102279029A CN102279029A CN 201110175945 CN201110175945A CN102279029A CN 102279029 A CN102279029 A CN 102279029A CN 201110175945 CN201110175945 CN 201110175945 CN 201110175945 A CN201110175945 A CN 201110175945A CN 102279029 A CN102279029 A CN 102279029A
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Abstract
The invention discloses a self-calibrating putting-into-type pressure liquid level meter which comprises a shell and a cable, wherein a main sensor and an auxiliary sensor are arranged in the shell; the cable is connected to the main sensor and the auxiliary sensor; the main sensor is arranged below the auxiliary sensor; and the vertical distance between the main sensor and the auxiliary sensor is a. The self-calibrating putting-into-type pressure liquid level meter provided by the invention has the advantages of self-calibrating function, accurate measuring result, low cost, simple structure, convenience in use and suitability for various occasions.
Description
Technical field:
The invention belongs to the level gauging field, relate to a kind of throw-in type pressure liquid level meter, especially a kind of high-precision throw-in type pressure liquid level meter of self-calibrating.
Background technology:
The principle of throw-in type pressure liquid level meter is pressure sensor directly to be put into be placed on liquid bottom in the liquid, calculates liquid level with the liquid pressure value that records divided by density of liquid and acceleration of gravity.Be liquid level h=P/ (ρ g), wherein, P is the pressure that records, and ρ is a density of liquid, and g is an acceleration of gravity.Throw-in type pressure liquid level meter is because structure is very simple, so cost is very cheap.The unit price of other various liquid level gauges is about 5,000 yuan to 50,000 yuan.The cost of throw-in type pressure liquid level meter has only hundreds of unit.But owing to be difficult to obtain exact value with the density of liquid ρ of the required usefulness of throw-in type pressure liquid level meter, need (for example annual) artificial demarcation regularly, what, temperature, composition, the variation of rest time of liquid all can cause liquid density variation, thereby it is big to form the level value error of measuring.Though just making, this very cheap very low occasion of precision prescribed that but can only be used for of throw-in type pressure liquid level meter has limited usable range greatly.
For example application number is that the Chinese patent of 200520107035.1 (applying date is on August 19th, 2005) discloses a kind of throw-in type pressure liquid level measuring instrument, the sensor of this fluid level measuring instrument is put in the testing liquid, adopt metal shell to seal fully, the pressure transducer probe detects pressure signal, carry out linear amplification through the operational amplification circuit plate that links to each other with this probe, the signal after amplifying by signal wire transmits is to the next stage detection system.Operational amplification circuit plate and signal transmssion line are arranged in protection tube and metal shell, isolate with measurement liquid, and the sensor probe pressure ratio communicate with outside atmosphere all the time than end.Overcome and to solve existing fluid level measuring instrument sealing property unreliable, cause measuring unstable, the not shortcoming and the problem of energy measurement high temperature wide range liquid level.But obviously this liquid level instrument does not overcome density error and causes the big defective of measuring error.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of self calibration throw-in type pressure liquid level meter is provided, this self calibration throw-in type pressure liquid level meter has self-calibration function, measurement result is accurate, cost is low, simple in structure, easy to use, can be applicable to various occasions, comprise being applicable to full-bodied environment.
The objective of the invention is to solve by the following technical programs: a kind of self calibration throw-in type pressure liquid level meter, comprise shell and cable, be provided with master reference and secondary sensor in the described shell, be connected with cable on master reference and the secondary sensor;
Described master reference is fixedly installed on secondary sensor below, and the vertical range fixed distance between master reference and the secondary sensor is a.
Described outer casing bottom is provided with pedestal.
Described case surface and master reference correspondence position are provided with main tracting pressuring hole; Described case surface and secondary sensor correspondence position are provided with secondary tracting pressuring hole.
Described shell top is connected with corrugated flexible hose, and this corrugated flexible hose is communicated with shell.
Described shell is made of the main casing that is interconnected, sub-shell and connecting pipe, and connecting pipe is arranged between main casing, the sub-shell; At the main casing internal fixation master reference is installed, the main casing sidewall is provided with main tracting pressuring hole; At the sub-shell internal fixation secondary sensor is installed, the sub-shell sidewall is provided with secondary tracting pressuring hole.
Described master reference and secondary sensor all are to be made of pressure probe.
Described shell is provided with temperature sensor, temperature sensor contact fluid to be measured.
The measuring method of described self calibration throw-in type pressure liquid level meter comprises the steps:
(1) the pressure liquid level meter is dropped in the testing liquid, master reference links to each other by the computing machine of cable with the container outside with secondary sensor;
(2) master reference measures main pressure P
Main, secondary sensor measurement obtains secondary pressure P
SecondaryIf master reference is h to the vertical height of liquid level
Main, secondary sensor is h to the vertical height of liquid level
SecondaryMaster reference is identical with secondary sensing station place solution density, all is ρ;
P
Main-P
Secondary=ρ g (h
Main-h
Secondary) (1);
h
Main-h
Secondary=a (2);
So the density p of master reference position is
ρ=(P
Main-P
Secondary)/ag (3);
(3) actual pressure of establishing the master reference position is P
Real, then
P
Real=ρ gh
Main=(P
Main-P
Secondary) h
Main/ a (4);
(4) establish master reference and measure main pressure P
MainWith the actual pressure of master reference position be P
RealEquate, then:
h
Main=a/ (1-P
Secondary/ P
Main) (5).
Master reference is to the vertical height h of liquid level
Main, just the measured liquid level h that obtains of self calibration throw-in type pressure liquid level meter is
H=h
Main=a/ (1-P
Secondary/ P
Main) (6).
Wherein, a is the vertical range between master reference and the secondary sensor, the good fixing numeral of having known of Precision Machining when being the manufacturing of self calibration throw-in type pressure liquid level meter, and for example 200 millimeters errors are less than 0.2 millimeter; P
Secondary, P
MainMeasure in real time.In the computing formula (6) of liquid level h, do not comprise and be difficult to the exactly determined fluid density value ρ that changes at any time.
And the liquid level computing formula of traditional throw-in type pressure liquid level meter is
h＝P/(ρg) (7)。
Here, density p is a multiple factor such as the time length, temperature of kind, the liquid level with liquid, static placement and changing at any time, ρ in the formula (7) should be to the mean value of bottom from the top of liquid, be be difficult to exactly determined at any time, generally be to use the regularly artificial very big value of expired error of demarcating, this level value that has just caused the traditional throw-in type pressure liquid level instrumentation amount of common use to obtain is acknowledged as very inaccurate.
Self calibration throw-in type pressure liquid level meter of the present invention has self-calibration function, measurement result is accurate, cost is low, simple in structure, easy to use, can be applicable to the multiple occasion that comprises high viscosity liquid.
Description of drawings:
Fig. 1 is a self calibration throw-in type pressure liquid level meter structural representation of the present invention;
Wherein: 1 is shell; 2 is corrugated flexible hose; 3 is cable; 4 is master reference; 5 is secondary sensor; 6 is pedestal; 7 is main tracting pressuring hole; 8 is secondary tracting pressuring hole; 9 is main casing; 10 is sub-shell; 11 is connecting pipe; 12 is temperature sensor.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, a kind of self calibration throw-in type pressure liquid level meter comprises shell and cable, is provided with master reference and secondary sensor in the described shell, is connected with cable on master reference and the secondary sensor;
Described master reference is fixedly installed on secondary sensor below, and the vertical range fixed distance between master reference and the secondary sensor is a.
Described outer casing bottom is provided with pedestal.
Described case surface and master reference correspondence position are provided with main tracting pressuring hole; Described case surface and secondary sensor correspondence position are provided with secondary tracting pressuring hole.
Described shell top is connected with corrugated flexible hose, and this corrugated flexible hose is communicated with shell.
Described shell is made of the main casing that is interconnected, sub-shell and connecting pipe, and connecting pipe is arranged between main casing, the sub-shell; At the main casing internal fixation master reference is installed, the main casing sidewall is provided with main tracting pressuring hole; At the sub-shell internal fixation secondary sensor is installed, the sub-shell sidewall is provided with secondary tracting pressuring hole.
Described main casing, sub-shell and connecting pipe are made by stainless steel or plastic-steel.
Described shell is provided with temperature sensor, temperature sensor contact fluid to be measured.
The measuring method of described self calibration throw-in type pressure liquid level meter comprises the steps:
(1) the pressure liquid level meter is dropped in the testing liquid, master reference links to each other by the computing machine of cable with the container outside with secondary sensor;
(2) master reference measures main pressure P
Main, secondary sensor measurement obtains secondary pressure P
SecondaryIf master reference is h to the vertical height of liquid level
Main, secondary sensor is h to the vertical height of liquid level
SecondaryMaster reference is identical with secondary sensing station place solution density, all is ρ;
P
Main-P
Secondary=ρ g (h
Main-h
Secondary) (1);
h
Main-h
Secondary=a (2);
So the density p of master reference position is
ρ=(P
Main-P
Secondary)/ag (3);
(3) actual pressure of establishing the master reference position is P
Real, then
P
Real=ρ gh
Main=(P
Main-P
Secondary) h
Main/ a (4);
(4) establish master reference and measure main pressure P
MainWith the actual pressure of master reference position be P
RealEquate, then:
h
Main=a/ (1-P
Secondary/ P
Main) (5).
Master reference is to the vertical height h of liquid level
Main, just the measured liquid level h that obtains of self calibration throw-in type pressure liquid level meter is
H=h
Main=a/ (1-P
Secondary/ P
Main) (6).
Wherein, a is the vertical range between master reference and the secondary sensor, the good fixing numeral of having known of Precision Machining when being the manufacturing of self calibration throw-in type pressure liquid level meter, and for example 200 millimeters errors are less than 0.2 millimeter; P
Secondary, P
MainMeasure in real time.In the computing formula (6) of liquid level h, do not comprise and be difficult to exactly determined fluid density value ρ.
Above content is to further describing that the present invention did in conjunction with concrete preferred implementation; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of being submitted to.
Claims (8)
1. a self calibration throw-in type pressure liquid level meter comprises shell and cable, it is characterized in that:
Be provided with master reference and secondary sensor in the described shell, be connected with cable on master reference and the secondary sensor;
Described master reference is fixedly installed on secondary sensor below, and the vertical range between master reference and the secondary sensor is fixed as a.
2. self calibration throw-in type pressure liquid level meter according to claim 1 is characterized in that:
Described outer casing bottom is provided with pedestal.
3. self calibration throw-in type pressure liquid level meter according to claim 1 is characterized in that:
Described case surface and master reference correspondence position are provided with main tracting pressuring hole; Described case surface and secondary sensor correspondence position are provided with secondary tracting pressuring hole.
4. self calibration throw-in type pressure liquid level meter according to claim 1 is characterized in that:
Described shell top is connected with corrugated flexible hose, and this corrugated flexible hose is communicated with shell.
5. self calibration throw-in type pressure liquid level meter according to claim 1 is characterized in that:
Described shell is made of the main casing that is interconnected, sub-shell and connecting pipe, and connecting pipe is arranged between main casing, the sub-shell; At the main casing internal fixation master reference is installed, the main casing sidewall is provided with main tracting pressuring hole; At the sub-shell internal fixation secondary sensor is installed, the sub-shell sidewall is provided with secondary tracting pressuring hole.
6. self calibration throw-in type pressure liquid level meter according to claim 1 is characterized in that:
Described shell is provided with temperature sensor, temperature sensor contact fluid to be measured.
7. self calibration throw-in type pressure liquid level meter according to claim 1, it is characterized in that: described master reference and secondary sensor all are to be made of pressure probe.
8. based on the measuring method of the described self calibration throw-in type of claim 1 pressure liquid level meter, it is characterized in that, comprise the steps:
(1) the pressure liquid level meter is dropped in the testing liquid, master reference links to each other by the computing machine of cable with the container outside with secondary sensor;
(2) master reference measures main pressure P
Main, secondary sensor measurement obtains secondary pressure P
SecondaryIf master reference is h to the vertical height of liquid level
Main, secondary sensor is h to the vertical height of liquid level
SecondaryMaster reference is identical with secondary sensing station place solution density, all is ρ;
P
Main-P
Secondary=ρ g (h
Main-h
Secondary) (1);
h
Main-h
Secondary=a (2);
So the density p of master reference position is
ρ=(P
Main-P
Secondary)/ag (3);
(3) actual pressure of establishing the master reference position is P
Real, then
P
Real=ρ gh
Main=(P
Main-P
Secondary) h
Main/ a (4);
(4) establish master reference and measure main pressure P
MainWith the actual pressure of master reference position be P
RealEquate, then:
h
Main=a/ (1-P
Secondary/ P
Main) (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110175945 CN102279029A (en) | 2011-06-30 | 2011-06-30 | Self-calibrating putting-into-type pressure liquid level meter and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110175945 CN102279029A (en) | 2011-06-30 | 2011-06-30 | Self-calibrating putting-into-type pressure liquid level meter and measuring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102279029A true CN102279029A (en) | 2011-12-14 |
Family
ID=45104605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110175945 Pending CN102279029A (en) | 2011-06-30 | 2011-06-30 | Self-calibrating putting-into-type pressure liquid level meter and measuring method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089680A (en) * | 2014-07-25 | 2014-10-08 | 赵云华 | Liquid level height measuring method and device |
| CN104864935A (en) * | 2015-05-07 | 2015-08-26 | 天津市市政工程设计研究院 | System and method for real-time monitoring of city drainage pipelines |
| CN104949731A (en) * | 2014-03-27 | 2015-09-30 | 江西飞尚科技有限公司 | Tailings water level measuring system based on errors of liquid density eliminated by osmometer |
| CN110486628A (en) * | 2019-09-06 | 2019-11-22 | 四川云炬业科技有限公司 | A kind of drainage pipeline high-precision liquid level monitoring system and method |
| CN111141366A (en) * | 2020-01-14 | 2020-05-12 | 北京远东仪表有限公司 | Multifunctional high-precision magnetostrictive tank area metering instrument |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08271318A (en) * | 1995-03-31 | 1996-10-18 | Yamatake Honeywell Co Ltd | Liquid level measuring device |
| US6687643B1 (en) * | 2000-12-22 | 2004-02-03 | Unirex, Inc. | In-situ sensor system and method for data acquisition in liquids |
| CN1621784A (en) * | 2004-12-31 | 2005-06-01 | 北京塞尔瑟斯仪表科技有限公司 | Two-wire system multiple sensors liquid level transmitting instrument |
| CN201107083Y (en) * | 2007-10-19 | 2008-08-27 | 江苏远望仪器有限公司 | Contrast type liquid level measuring device |
-
2011
- 2011-06-30 CN CN 201110175945 patent/CN102279029A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08271318A (en) * | 1995-03-31 | 1996-10-18 | Yamatake Honeywell Co Ltd | Liquid level measuring device |
| US6687643B1 (en) * | 2000-12-22 | 2004-02-03 | Unirex, Inc. | In-situ sensor system and method for data acquisition in liquids |
| CN1621784A (en) * | 2004-12-31 | 2005-06-01 | 北京塞尔瑟斯仪表科技有限公司 | Two-wire system multiple sensors liquid level transmitting instrument |
| CN201107083Y (en) * | 2007-10-19 | 2008-08-27 | 江苏远望仪器有限公司 | Contrast type liquid level measuring device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949731A (en) * | 2014-03-27 | 2015-09-30 | 江西飞尚科技有限公司 | Tailings water level measuring system based on errors of liquid density eliminated by osmometer |
| CN104089680A (en) * | 2014-07-25 | 2014-10-08 | 赵云华 | Liquid level height measuring method and device |
| CN104089680B (en) * | 2014-07-25 | 2018-01-12 | 赵云华 | The measuring method and device of liquid level height |
| CN104864935A (en) * | 2015-05-07 | 2015-08-26 | 天津市市政工程设计研究院 | System and method for real-time monitoring of city drainage pipelines |
| CN110486628A (en) * | 2019-09-06 | 2019-11-22 | 四川云炬业科技有限公司 | A kind of drainage pipeline high-precision liquid level monitoring system and method |
| CN111141366A (en) * | 2020-01-14 | 2020-05-12 | 北京远东仪表有限公司 | Multifunctional high-precision magnetostrictive tank area metering instrument |
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Application publication date: 20111214 |