CN108872323A - A kind of electromagnetic type concentration of nitric acid in-line analyzer - Google Patents
A kind of electromagnetic type concentration of nitric acid in-line analyzer Download PDFInfo
- Publication number
- CN108872323A CN108872323A CN201810799886.9A CN201810799886A CN108872323A CN 108872323 A CN108872323 A CN 108872323A CN 201810799886 A CN201810799886 A CN 201810799886A CN 108872323 A CN108872323 A CN 108872323A
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- Prior art keywords
- nitric acid
- signal
- circuit
- line analyzer
- electromagnetic type
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 3
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 3
- 230000010356 wave oscillation Effects 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Electrochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention proposes a kind of electromagnetic type concentration of nitric acid in-line analyzer, including electromagnetic sensor, acidproof plastic shell, measuring flume, conductance signal conversion circuit, temperature signal conversion circuit and computer processing circuit；The sine wave signal of the exciting circuit output 30kHz of the electromagnetic sensor is to excitation coil；The excitation coil and detection coil form conductivity inductive loop；The conductance signal of the detection coil output inputs computer processing circuit by conductance signal conversion circuit；The temperature signal of temperature element inputs computer processing circuit by temperature signal conversion circuit；Computer processing circuit calculates output concentration value signal.The present invention measures the conductivity and temperature of solution by electromagnetic sensor, calculates solution concentration, measurement accuracy height, strong antijamming capability；Using high frequency excitation voltage signal, effectively inhibition Hz noise, inductive signal is strong, can amplify to poor conductivity, and conductivity measurement range is big；Acidproof plastic shell prevents electromagnetic sensor from corroding.
Description
Technical field
The invention belongs to technical field of analytical instruments, are related to a kind of electromagnetic type concentration of nitric acid in-line analyzer.
Background technique
In nitric acid production plant, nitric acid solution haves the characteristics that corrosivity is strong.Currently, to nitre during nitric acid production
The analysis of acid concentration mostly based on manual analysis, there are errors it is big, interval time is long the disadvantages of.And it is directed to concentration of nitric acid in the market
The instrument measured mostly uses greatly electric pole type structure, and sensing elements are directly contacted with nitric acid solution, is easy to be corroded, existing makes
With the problems such as service life is short, measurement error is big.
Summary of the invention
The technical issues of solution：The present invention proposes a kind of electromagnetic type concentration of nitric acid in-line analyzer, corrosion-resistant, measurement accuracy
High, strong antijamming capability.
Technical solution：The present invention proposes a kind of electromagnetic type concentration of nitric acid in-line analyzer, including electromagnetic sensor, encapsulation electricity
The acidproof plastic shell of Magnetic Sensor is arranged on the outside of acidproof plastic shell and is loaded with the measuring flume of nitric acid solution to be measured, electricity
Lead signal conversion circuit, temperature signal conversion circuit and computer processing circuit；The electromagnetic sensor includes excitation coil, inspection
Test coil, temperature element and exciting circuit；The exciting circuit include square-wave oscillator, second level active filter circuit, detection and
Feedback control circuit, the square-wave oscillator export 30kHz square wave oscillation signal, export after second level active filter circuit
The sine wave signal of 30kHz；Detection and feedback control circuit carry out detection processing to the signal and are converted into DC voltage, and will be defeated
The amplitude adjusting of sine wave signal out exports after stablizing to excitation coil；The excitation coil and detection coil form conductivity
Inductive loop；The conductance signal of detection coil output amplified by conductance signal conversion circuit, detection, then will be straight
The analog signal of galvanic electricity pressure is converted into digital signal input computer processing circuit；The temperature signal of temperature element is believed by temperature
Number conversion circuit is converted into digital signal input computer processing circuit；Computer processing circuit is believed by conductance signal and temperature
Number calculate output nitric acid solution concentration value signal.
Further, the square-wave oscillator is NE555 oscillator.
Further, the acidproof plastic shell is tetrafluoroethene material, including sensor mounting groove and is successively set on biography
Encapsulating housing and sensor lead mouth on sensor mounting groove.
Further, the measuring flume include the sensor insert port that top is set, sewage draining exit arranged at the bottom and
The nitric acid solution import and nitric acid solution outlet of side wall are set；The level height of the nitric acid solution import is lower than nitric acid solution
The level height of outlet.
Further, the detection and feedback control circuit are electric for half by the amplitude stability of the sine wave signal of output
Source voltage.
Further, the excitation coil and detection coil are the magnetic core rings of Ferrite Material.
Further, the excitation coil and detection coil are wound with copper wire, and copper wire the number of turns of excitation coil is less than detection
Copper wire the number of turns of coil.
Further, the ratio of copper wire the number of turns of copper wire the number of turns and detection coil of the excitation coil is 100：200.
Further, the temperature element is PT100 resistance.
Further, the concentration value signal of nitric acid solution is converted into the output of 4~20mA signal by the computer processing circuit
To user terminal.
Beneficial effect：The present invention measures the conductivity and temperature of solution by electromagnetic sensor, uses computer processing circuit
Calculate solution concentration, measurement accuracy height, strong antijamming capability；Using high frequency excitation voltage signal, effectively inhibit Hz noise,
Inductive signal is strong, can amplify to poor conductivity, and conductivity measurement range is big；Acidproof plastic shell by electromagnetic sensor with
Nitric acid solution isolation, prevents from corroding, improves the service life of equipment.
Detailed description of the invention
Fig. 1 is organigram of the invention；
Fig. 2 is the partial structure diagram of electromagnetic sensor of the invention；
Fig. 3 is the structural schematic diagram of acidproof plastic shell of the invention；
Fig. 4 is the structural schematic diagram of measuring flume of the invention.
Specific embodiment
Such as Fig. 1, a kind of embodiment of the invention, including electromagnetic sensor, the acidproof plastic shell that encapsulates electromagnetic sensor,
It is arranged on the outside of acidproof plastic shell and is loaded with the measuring flume of nitric acid solution to be measured, conductance signal conversion circuit, temperature signal
Conversion circuit and computer processing circuit.
Such as Fig. 2, the electromagnetic sensor includes excitation coil 1, detection coil 2, temperature element 3 and exciting circuit.It is described
Exciting circuit includes NE555 oscillator, second level active filter circuit, detection and feedback control circuit.The NE555 oscillator is defeated
30kHz square wave oscillation signal out exports the sine wave signal of 30kHz after second level active filter circuit；Detection and feedback control
Circuit carries out detection processing to the signal and is converted into DC voltage, by feedback control that the amplitude of the sine wave signal of output is steady
It exports after being set to half supply voltage to excitation coil 1.The present embodiment drives electromagnetism using the high-frequency voltage signal of 30kHz
Sensor, can more effectively inhibit Hz noise, and under high frequency condition, electromagnetic signal inductive signal is strong, can carry out to poor conductivity
Amplification, conductivity measurement range are big.
The excitation coil 1 and detection coil 2 form conductivity inductive loop；The conductance letter that the detection coil 2 exports
It number is amplified by conductance signal conversion circuit, detection, it is defeated that the analog signal of DC voltage is then converted into digital signal
Enter computer processing circuit；The temperature signal of temperature element 3 is converted into digital signal input meter by temperature signal conversion circuit
Calculation machine processing circuit.Computer processing circuit receives conductance signal and temperature signal, using conductivity, temperature as acid-base solution
The binary function of concentration compensates, i.e. C=f (t, k)=∑ijl ditjkl, in formula：K, t are respectively the conductivity of solution
And temperature, di are undetermined coefficients, according to electrical conductivity of solution and concentration, temperature relation tables of data, determine two using least square method
The undetermined coefficient di of first repeatedly item.Because the conductivity and concentration, temperature of solution have relationship, so the present embodiment meter calculates
Solution concentration accuracy it is high.
The excitation coil 1 and detection coil 2 are the magnetic core ring of Ferrite Material, ferritic resistivity ratio elemental metals
Or alloy magnetic material is big, and there are also higher dielectric properties, when high frequency magnetic conductivity with higher, stability and anti-interference
Ability is strong.The ratio of copper wire the number of turns of copper wire the number of turns and detection coil 2 of the excitation coil 1 is 100：200, it plays signal and puts
Big effect.The temperature element 3 is PT100 resistance.
Such as Fig. 3, the acidproof plastic shell includes sensor mounting groove 4 and is successively set on sensor mounting groove 4
Encapsulating housing 5 and sensor lead mouth 6.Acidproof plastic shell uses tetrafluoroethene material, and acid resistance is excellent, by electromagnetic sensing
Device is isolated with nitric acid solution, prevents from corroding, and improves the service life of equipment.
Being loaded in the measuring flume of nitric acid solution to be measured such as Fig. 4, the measuring flume is arranged in the acidproof plastic shell
Sensor insert port 7, sewage draining exit arranged at the bottom 8 and the nitric acid solution import that side wall is set including top is arranged in
9 and nitric acid solution outlet 10；Level height of the level height of the nitric acid solution import 9 lower than nitric acid solution outlet 10.It should
Nitric acid solution is drawn from process units and is measured by measuring flume, does not influence the production of device, while the setting of low in and high out
So that the solution in measuring flume is kept circulation, improves measurement accuracy.
The concentration value signal of nitric acid solution is converted into 4~20mA signal and exported to user's end by the computer processing circuit
End, user can remotely monitor the concentration of nitric acid solution.
Claims (10)
1. a kind of electromagnetic type concentration of nitric acid in-line analyzer, it is characterised in that：Including electromagnetic sensor, encapsulate electromagnetic sensor
Acidproof plastic shell is arranged on the outside of acidproof plastic shell and is loaded with the measuring flume of nitric acid solution to be measured, conductance signal conversion
Circuit, temperature signal conversion circuit and computer processing circuit；The electromagnetic sensor includes excitation coil（1）, detection coil
（2）, temperature element（3）And exciting circuit；The exciting circuit include square-wave oscillator, second level active filter circuit, detection and
Feedback control circuit, the square-wave oscillator export 30kHz square wave oscillation signal, export after second level active filter circuit
The sine wave signal of 30kHz；Detection and feedback control circuit carry out detection processing to the signal and are converted into DC voltage, and will be defeated
The amplitude adjusting of sine wave signal out exports after stablizing to excitation coil（1）；The excitation coil（1）And detection coil（2）
Form conductivity inductive loop；The detection coil（2）The conductance signal of output amplified by conductance signal conversion circuit,
Then the analog signal of DC voltage is converted into digital signal input computer processing circuit by detection；Temperature element（3）Temperature
Degree signal is converted into digital signal by temperature signal conversion circuit and inputs computer processing circuit；Computer processing circuit passes through
Conductance signal and temperature signal calculate the concentration value signal of output nitric acid solution.
2. electromagnetic type concentration of nitric acid in-line analyzer according to claim 1, it is characterised in that：The square-wave oscillator is
NE555 oscillator.
3. electromagnetic type concentration of nitric acid in-line analyzer according to claim 1, it is characterised in that：The acidproof plastic shell
It is tetrafluoroethene material, including mounting groove（4）Be successively set on mounting groove（4）On encapsulating housing（5）And lead wire outlet（6）.
4. electromagnetic type concentration of nitric acid in-line analyzer according to claim 3, it is characterised in that：The measuring flume includes setting
Set the sensor insert port at top（7）, sewage draining exit arranged at the bottom（8）And the nitric acid solution import of side wall is set
（9）It is exported with nitric acid solution（10）；The nitric acid solution import（9）Level height lower than nitric acid solution export（10）Level
Highly.
5. electromagnetic type concentration of nitric acid in-line analyzer according to any one of claims 1-4, it is characterised in that：The inspection
Involving feedback control circuit for the amplitude stability of the sine wave signal of output is half supply voltage.
6. electromagnetic type concentration of nitric acid in-line analyzer according to claim 1, it is characterised in that：The excitation coil（1）
And detection coil（2）It is the magnetic core ring of Ferrite Material.
7. electromagnetic type concentration of nitric acid in-line analyzer according to claim 6, it is characterised in that：The excitation coil（1）
And detection coil（2）It is wound with copper wire, and copper wire the number of turns of excitation coil is less than copper wire the number of turns of detection coil.
8. electromagnetic type concentration of nitric acid in-line analyzer according to claim 7, it is characterised in that：The excitation coil（1）
Copper wire the number of turns and detection coil（2）Copper wire the number of turns ratio be 100：200.
9. electromagnetic type concentration of nitric acid in-line analyzer according to claim 1, it is characterised in that：The temperature element（3）
It is PT100 resistance.
10. electromagnetic type concentration of nitric acid in-line analyzer according to claim 1, it is characterised in that：The computer disposal
The concentration value signal of nitric acid solution is converted into 4~20mA signal and exported to user terminal by circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799886.9A CN108872323A (en) | 2018-07-20 | 2018-07-20 | A kind of electromagnetic type concentration of nitric acid in-line analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799886.9A CN108872323A (en) | 2018-07-20 | 2018-07-20 | A kind of electromagnetic type concentration of nitric acid in-line analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108872323A true CN108872323A (en) | 2018-11-23 |
Family
ID=64303592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810799886.9A Pending CN108872323A (en) | 2018-07-20 | 2018-07-20 | A kind of electromagnetic type concentration of nitric acid in-line analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108872323A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231367A (en) * | 2019-07-05 | 2019-09-13 | 宣城亨泰电子化学材料有限公司 | A kind of online Concentration Testing analyzer |
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010006752A1 (en) * | 2008-07-14 | 2010-01-21 | Mettler-Toledo Ag | Method and device for inductive conductivity measurements of a fluid medium |
| CN203534998U (en) * | 2013-10-31 | 2014-04-09 | 重庆川仪分析仪器有限公司 | Electromagnetic induction type device for detecting solution density |
| CN106556622A (en) * | 2015-09-29 | 2017-04-05 | 中国石油化工集团公司 | A kind of self adaptation acid-base solution concentration in-line analyzer |
| CN206638620U (en) * | 2017-04-18 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of pH measurement apparatus of one-component solution |
-
2018
- 2018-07-20 CN CN201810799886.9A patent/CN108872323A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010006752A1 (en) * | 2008-07-14 | 2010-01-21 | Mettler-Toledo Ag | Method and device for inductive conductivity measurements of a fluid medium |
| CN203534998U (en) * | 2013-10-31 | 2014-04-09 | 重庆川仪分析仪器有限公司 | Electromagnetic induction type device for detecting solution density |
| CN106556622A (en) * | 2015-09-29 | 2017-04-05 | 中国石油化工集团公司 | A kind of self adaptation acid-base solution concentration in-line analyzer |
| CN206638620U (en) * | 2017-04-18 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of pH measurement apparatus of one-component solution |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231367A (en) * | 2019-07-05 | 2019-09-13 | 宣城亨泰电子化学材料有限公司 | A kind of online Concentration Testing analyzer |
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
| CN114034929B (en) * | 2021-11-12 | 2024-04-19 | 国家海洋技术中心 | Non-external field induction type conductivity sensor |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181123 |
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| RJ01 | Rejection of invention patent application after publication |