CN102262128A - Online concentration measurement and control instrument for DMF (dimethylformamide) solution - Google Patents
Online concentration measurement and control instrument for DMF (dimethylformamide) solution Download PDFInfo
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- CN102262128A CN102262128A CN201110157351XA CN201110157351A CN102262128A CN 102262128 A CN102262128 A CN 102262128A CN 201110157351X A CN201110157351X A CN 201110157351XA CN 201110157351 A CN201110157351 A CN 201110157351A CN 102262128 A CN102262128 A CN 102262128A
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Abstract
The invention discloses an online concentration measurement and control instrument for a DMF (dimethylformamide) solution, which is composed of a DMF solution concentration detector and a human-computer interface intelligent control center. By using the instrument disclosed by the invention, the online real-time measurement and control on the DMF concentration in a DMF mixed solution can be realized by using the propagation characteristics of electromagnetic waves in the DMF solution, and the instrument can directly show the DMF percentage concentration in the DMF mixed solution, dynamically output the measured values on a LCD (liquid crystal display) screen and simultaneously output 4-20 mA standard analogue signals for control output. The instrument disclosed by the invention fills in the technical gap of the field, and revolutionarily solves the problem on the online real-time DMF concentration measurement.
Description
Technical field
The present invention relates to industry solution concentration measurement and control field, especially is a kind of dimethyl formamide solution concentration online monitoring method instrument.
Background technology
The measurement of dimethyl formamide concentration in the dimethyl formamide mixed solution at present, the main hand-hold refractometer that adopts is converted into concentration by measuring index of refraction, or adopt Abbe refractometer to record index of refraction and calculate by the method for tabling look-up and obtain concentration value, there is following shortcoming in these methods:
1. can't realize the online in real time measurement, need artificial timing acquiring, measure solution concentration, measure inconvenience;
2. measure by naked eyes, the survey measurements error is big;
3. measure by look-up table, measuring accuracy is low;
4. along with the variation of environment temperature and solution temperature, the measured value deviation is bigger.
Summary of the invention
Technical matters solved by the invention is to provide a kind of dimethyl formamide solution concentration online monitoring method instrument, to solve the shortcoming in the above-mentioned background technology.
Technical matters solved by the invention realizes by the following technical solutions:
A kind of dimethyl formamide solution concentration online monitoring method instrument, mainly form, be used for measuring the concentration of dimethyl formamide in the dimethyl formamide mixed solution based on the electromagnetic transmission characteristic by dimethyl formamide solution concentration detector and man-machine interface intelligent control center two parts; Simultaneously, have temperature self-compensation, not with solution temperature and ambient temperature effect measuring accuracy; Have standard analog amount control output, be convenient to system integration control.
The solution concentration detector: it is a whole most crucial part of measurement and control instrument, it is by the propagation of electromagnetic wave in dimethyl formamide solution, different by electric field before and after judging electromagnetic wave incident solution with the phase change in magnetic field, measure the difference of dimethyl formamide concentration in the dimethyl formamide mixed solution.It mainly contains electromagnetic wave emission source, dielectric cavity, and the electromagnetic wave receiver module, signal processing module four parts such as (phase analysises) are formed.Described dielectric cavity is a channel architecture, between electromagnetic wave emission source and electromagnetic wave receiver module, be used for receiving the solution that the uniform flow system flows into, the electromagnetic wave of anterior incident electromagnetic wave emissive source emission, the rear portion then receives the electromagnetic wave that passes solution by the electromagnetic wave receiver module, and carry out data processing by the signal processing module of concentration online monitoring method instrument end, and be output as the analog signals of 4-20mA according to data message, be used for controlling and obtain the servocontrol proportion valve that the outside clear water water source of system front end is connected with solution and control external clear water water source influx with controlling opening of valve.
The man-machine interface intelligent control center is mainly by the CPU processing module, LCDs, three parts such as external communication module are formed, acting as of it carried out analyzing and processing to the signal of detector signal processing module output, and under different temperatures, carry out parametric compensation, and be converted to the concentration percentage value and be presented on the LCDs, simultaneously concrete RS485 standard communication modes and 4-20mA analog quantity mode output signal.
The present invention utilizes the propagation characteristic of electromagnetic wave in dimethyl formamide solution: the electromagnetic wave of certain frequency is propagated at the dimethyl formamide solution of variable concentrations, different by electric field before and after detecting electromagnetic wave incident solution with the phase change in magnetic field, measure the difference of dimethyl formamide concentration in dimethyl formamide (DMF) mixed solution.
The propagation of electromagnetic wave in dimethyl formamide solution, promptly dielectric parameter and magnetic permeability all are the ripple propagation condition of real number.By relational expression
As can be known, wave number k must be real number.According to plane wave solution form E=E
0Exp[j (ω t-kr)] easily know, plane electromagnetic wave is propagated in dimethyl formamide solution, have only phase place to change, no amplitude changes, electric field is different with the phase change in magnetic field before and after passing through thus to judge electromagnetic wave incident solution, measures the difference of dimethyl formamide concentration in dimethyl formamide (DMF) mixed solution.
Beneficial effect: the present invention is easy to use, and intelligent degree height is convenient to system integration control, can realize effectively that online in real time is measured and control, and measuring accuracy is higher, can reach error less than 0.1%; Not with solution temperature and ambient temperature effect measuring accuracy; Simultaneously, have intelligent checking system, stable performance, reliability height.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention;
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
In the preferred embodiment referring to a kind of dimethyl formamide solution concentration online monitoring method instrument of Fig. 1, the electromagnetic wave of electromagnetic wave emission source 1 emission is propagated the back and is accepted by electromagnetic wave receiver module 3 in the dimethyl formamide solution in dielectric cavity 2, and utilize signal processing module 4 to carry out data analysis, different by electric field before and after judging electromagnetic wave incident solution with the phase change in magnetic field, measure the difference of dimethyl formamide concentration in the dimethyl formamide mixed solution.
In the present embodiment, solution concentration online monitoring method instrument end is also connected to the man-machine interface intelligent control center, the display screen 6 of man-machine interface intelligent control center can be used for observing intuitively the related concentrations data that solution concentration online monitoring method instrument spreads out of, CPU processing module 5 is carried out analyzing and processing to the signal of detector signal processing module 4 outputs, and under different temperatures, carry out parametric compensation, and be converted to the concentration percentage value and be presented on the display screen 6, and set up external communication by external communication module 7.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (1)
1. dimethyl formamide solution concentration online monitoring method instrument, form by dimethyl formamide solution concentration detector and man-machine interface intelligent control center two parts, it is characterized in that, described solution concentration detector is a whole most crucial part of measurement and control instrument, comprise: electromagnetic wave emission source, dielectric cavity, the electromagnetic wave receiver module, signal processing module four parts, dielectric cavity is a channel architecture, between electromagnetic wave emission source and electromagnetic wave receiver module, and concentration online monitoring method instrument end signal processing module also is installed; Described man-machine interface intelligent control center is mainly by the CPU processing module, LCDs, three parts such as external communication module are formed, in order to the signal of detector signal processing module output is carried out analyzing and processing, and under different temperatures, carry out parametric compensation, and be converted to the concentration percentage value and be presented on the LCDs; Simultaneously, also be provided with temperature self-compensation in the solution concentration online monitoring method instrument, not with solution temperature and ambient temperature effect measuring accuracy; Have standard analog amount control output, be convenient to system integration control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110157351XA CN102262128A (en) | 2011-06-13 | 2011-06-13 | Online concentration measurement and control instrument for DMF (dimethylformamide) solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110157351XA CN102262128A (en) | 2011-06-13 | 2011-06-13 | Online concentration measurement and control instrument for DMF (dimethylformamide) solution |
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| Publication Number | Publication Date |
|---|---|
| CN102262128A true CN102262128A (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110157351XA Pending CN102262128A (en) | 2011-06-13 | 2011-06-13 | Online concentration measurement and control instrument for DMF (dimethylformamide) solution |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113320A (en) * | 1993-07-12 | 1995-12-13 | 株式会社东芝 | Apparatus for and method of measuring difference of phases |
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2011
- 2011-06-13 CN CN201110157351XA patent/CN102262128A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113320A (en) * | 1993-07-12 | 1995-12-13 | 株式会社东芝 | Apparatus for and method of measuring difference of phases |
Non-Patent Citations (1)
| Title |
|---|
| 刘元扬: "《自动检测和过程控制（第3版）》", 31 August 2005, 冶金工业出版社 * |
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Application publication date: 20111130 |