CN2204046Y - Micro coulometer for measuring chloride and inorganic chlorine ion - Google Patents
Micro coulometer for measuring chloride and inorganic chlorine ion Download PDFInfo
- Publication number
- CN2204046Y CN2204046Y CN 94202828 CN94202828U CN2204046Y CN 2204046 Y CN2204046 Y CN 2204046Y CN 94202828 CN94202828 CN 94202828 CN 94202828 U CN94202828 U CN 94202828U CN 2204046 Y CN2204046 Y CN 2204046Y
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- China
- Prior art keywords
- circuit
- instrument
- microcomputer
- keyboard
- titration cell
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Abstract
The utility model relates to a micro coulometer used for measuring the content of chlorine salt and inorganic chlorine ions in crude oil, fraction, petroleum products, industrial water and discharged water. On the basis of the prior art, the micro coulometer improves a circuit structure and adds components of a microcomputer, a printer, a simulative titration cell, etc. The operation steps of detecting signals, balancing baselines, measuring electrolysis, judging an end point, computing results, displaying, printing, etc., of the micro coulometer all automatically carry out by the microcomputer. The utility model has the advantages of low noise, small drift, good stability and high measuring precision.
Description
The utility model is a kind of Microcoulomb instrument of measuring villaumite and inorganic chlorine ion concentration in crude oil and cut, petroleum products, process water and the discharge water.
CN87214257.4 has introduced a kind of Microcoulomb instrument of measuring chloride content, the input of the amplifier of this instrument, output terminal adopt four synchronization transistor choppers to realize synchro switches, two processes of sampling and measuring and electrolytic titration are not taken place at one time but hocket.Yet the used transistor chopper of this line construction is subjected to surge easily and damages, and causes the input signal distortion.In this instrument, tested current i changes into voltage signal V through the electric cloudy R that takes a sample, and becomes correspondent frequency signal f through counter 7CJ03 again, thereby has realized the i-f conversion, adopts the DL-8103 thick film circuit to finish the V-f translation function again.Because the foregoing circuit structure has been used resolution element, easily produces noise and drift, thereby the precision of measuring is restricted.In addition, its integration baseline is by operator's hand reset, and analysis result can only show with μ Vs, can not print the numeric results of requirement.When instrument is tested, also need external simulation titration cell, operate more loaded down with trivial details.
The purpose of this utility model is to overcome the weak point of above-mentioned instrument, provide a kind of by microcomputer operation, have detection, baseline balance, control survey-electrolysis, judge the whole robotizations of operation such as terminal point, result of calculation, at last the mensuration villaumite that the measurement result printing is quoted and the Microcoulomb instrument of inorganic chlorine ion concentration.
The principle of operation of the utility model Microcoulomb instrument is referring to the theory diagram of accompanying drawing 1, this instrument by end point determination sample circuit 1, subtracter 2, electric current amplification output circuit 3, electrolytic simulation switch 4, analog to digital converter 5, bias generating circuit 6, microcomputer 7, printer 8, keyboard and display interface 9, display 10, keyboard 11, potential electrode to 14,15, simulation titration cell 25, analog switch 26, and parts such as titration cell 27 constitute.Its principle of work is as follows: after the potential electrode of titration cell 27 is relatively amplified through end point determination sample circuit 1 12,13 voltage signals of exporting, export a signal, this signal promptly further compares with the bias voltage signal that instrument takes place, if current potential equates (because direction is opposite), it is output as zero, and titration cell 27 just is in equilibrium state.After specimen is injected titration cell 27, the chlorion (Cl in the sample
-) with titration cell 27 in titration silver ion (Ag
+) reaction, thereby consumed silver ion, and its concentration is reduced, caused the variation of potential electrode to 12,13 current potentials.This subtle change is after excess current amplification output circuit 3 amplifies electric current, be converted to digital signal through A/D analog to digital converter 5 again, be input to microcomputer 7, export a relevant voltage and be added to electrolysis electrode on 14,15, electrolytic anode 14 electricity bear the silver ion that corresponding silver ion consumes with postreaction, through measure replenishing the electric weight of the institute's silver ion that consumes needs, according to the faraday electrolysis law, after being handled by microcomputer 7, display 10 and printer 8 just print the data of the content of chloride content in the sample or inorganic chlorine ion.
Further specify the line construction of the utility model Microcoulomb instrument below in conjunction with all the other accompanying drawings.
Accompanying drawing 2 is the line assumption diagrams that detect sample circuit 1.
Accompanying drawing 3 is line assumption diagrams of electric current amplification output circuit 3.
Accompanying drawing 4 is line assumption diagrams of bias generating circuit 6.
Accompanying drawing 5 is line assumption diagrams of analog to digital converter 5.
In accompanying drawing 1, the input end of end point determination sample circuit 1 connects 12,13 with potential electrode, and output terminal connects with subtracter 2.When titration cell disconnected, input end was connected with simulation titration cell 25.Bias generating circuit 6 links to each other with microcomputer 7 and subtracter 2.Electric current amplification output circuit 3 links to each other with analog switch 26 with subtracter 2.Microcomputer 7(MCS-5 single-chip microcomputer 8031) with bias generating circuit 6, analog to digital converter 5, printer 8(MP-16), keyboard and display interface 9(model 8279) be connected, keyboard and display interface 9 is connected with display 10 and keyboard 11 again.Electrolysis cathode 15 is connected with electrolytic simulation switch 4, electrolytic anode 14 ground connection.
In the end point determination sample circuit of accompanying drawing 2, two high resistant followers 16,17 have been used, with the MOS field effect transistor chopper of replaced C N87214257.4 utility model patent Microcoulomb instrument.Such line construction makes the input of instrument very reliable, can not occur owing to surge makes the input utmost point of the instrument phenomenon that is damaged.These two high resistant followers 16,17 and subtracting amplifier 18 all adopt OP-07 type operational amplifier, and its input impedance reaches 10
8The resistance of Ω, measuring-signal is exported after 10 times of amplifications.
Electric current amplification output circuit 3 in accompanying drawing 3 is by emitter follower 19(OP07), high pressure integrated operational amplifier 20(model LM344) and power amplifier 21 form, adopt directly coupling between the utmost point and the utmost point, purpose is in order to improve input current, to eliminate magnification distortion.
Bias generating circuit 6 in accompanying drawing 4 is mainly by D/A digital to analog converter and 10 times of amplifier 22(model OP07) constitute, the D/A digital to analog converter adopts is 12 DAC1210.
The circuit of the analog to digital converter 5 of accompanying drawing 5 be by 12 times A/D analog to digital converter (AD574) and model be 4051 and two followers 23,24 of OP07 constitute.
Compare with the prior art (CN87214257.4) of the Microcoulomb instrument of measuring chloride content, the utlity model has following advantage and better performance:
1, the utility model has adopted two high resistant followers to replace the transistor chopper switch, makes the input of instrument reliable.
2, the utility model has adopted the operational amplifier spare of low drift, low imbalance, and the noise of instrument and drift are greatly reduced.
3, the utility model adopts microcomputer technology, makes measuring-signal collection, electrolysis control, data processing by system controlled by computer, and the stability of instrument and degree of accuracy all have raising, and automaticity and analysis speed also have significant improvement.
4, the utility model is provided with the simulation titration cell, and instrument has self-checking function, promptly when not connecing titration cell, can carry out the check of instrument to instrument, and the right given bias value of output of analogue measurement electrode pair and electrolysis electrode is at 0～400mV.
5, the utility model determines that titration end-point is to adopt slope detection and level detection way of combining, can improve the reliability of endpoint.
6, the utility model is provided with the switch key of salt content and inorganic chlorine ion concentration, can test respectively according to analyzing needs, uses ng(mg) NaCl/L or ppmCl
-Provide analysis result and data are printed and quote.
Claims (6)
1, a kind ofly be used to measure crude oil and cut thereof, petroleum products, the Microcoulomb instrument of villaumite and inorganic chlorine ion concentration in process water and the discharge water, by sample circuit, input circuit, operational amplifier, the circuit of part such as display constitutes, and it is characterized in that it is by end point determination sample circuit 1, subtracter 2, electric current amplification output circuit 3, electrolytic simulation switch 4, analog-digital converter 5, bias generating circuit 6, microcomputer 7, printer 8, keyboard and display interface 9, display 10, keyboard 11, potential electrode is to 12,13, electrolysis electrode is to 14,15, simulation titration cell 25, the Microcoulomb instrument that the circuit of part such as analog switch 26 and titration cell 27 constitutes by the microcomputer control operation; Line connection between each several part is:
(1) input end of end point determination sample circuit 1 is connected 12,13 with potential electrode, and output terminal links to each other with subtracter 2;
(2) bias generating circuit 6 is connected with subtracter 2 and microcomputer 7 respectively;
(3) electric current amplification output circuit 3 is connected with subtracter 2 and analog switch 26;
(4) microcomputer 7 is connected with analog-digital converter 5, bias generating circuit 6, printer 8 and keyboard and display interface 9 respectively;
(5) keyboard and display interface 9 is connected with display 10 and keyboard 11;
(6) potential electrode of titration cell 27 is connected with end point determination sample circuit 1 to 12,13, and electrolysis cathode 15 connects electrolytic anode 14 ground connection with electrolytic simulation switch 4.
2, according to the Microcoulomb instrument of claim 1, it is characterized in that said end point determination sample circuit 1 is to be made of two high resistant followers 16,17 and subtracting amplifier 18,16,17, and 18 be OP-07 type operational amplifier, input impedance is 10
8Ω.
3,, it is characterized in that said electric current amplification output circuit 3 is to be made of follower 19, high pressure integrated operational amplifier 20 and power amplifier 21 according to the Microcoulomb instrument of claim 1.
4,, it is characterized in that said bias generating circuit 6 is to be made of D/A D-A converter and amplifier 22 according to the Microcoulomb instrument of claim 1.
5,, it is characterized in that said analog-digital converter 5 is to be made of A/D converter and follower 23,24 according to the Microcoulomb instrument of claim 1.
6, according to the Microcoulomb instrument of claim 1, it is characterized in that when not connecting titration cell said simulation titration cell 25 can be tested to instrument, the given bias value of the output of analogue measurement electrode pair is 0～400mV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94202828 CN2204046Y (en) | 1994-02-18 | 1994-02-18 | Micro coulometer for measuring chloride and inorganic chlorine ion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94202828 CN2204046Y (en) | 1994-02-18 | 1994-02-18 | Micro coulometer for measuring chloride and inorganic chlorine ion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2204046Y true CN2204046Y (en) | 1995-07-26 |
Family
ID=33822494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94202828 Expired - Lifetime CN2204046Y (en) | 1994-02-18 | 1994-02-18 | Micro coulometer for measuring chloride and inorganic chlorine ion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2204046Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852573A (en) * | 2004-09-15 | 2014-06-11 | 英国石油国际有限公司 | Process for evaluating a refinery feedstock |
-
1994
- 1994-02-18 CN CN 94202828 patent/CN2204046Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852573A (en) * | 2004-09-15 | 2014-06-11 | 英国石油国际有限公司 | Process for evaluating a refinery feedstock |
| CN103852573B (en) * | 2004-09-15 | 2017-01-04 | 英国石油国际有限公司 | The method of assessment refinery feedstock |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |