CN87104078A - Autotitrator - Google Patents
Autotitrator Download PDFInfo
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- CN87104078A CN87104078A CN87104078.6A CN87104078A CN87104078A CN 87104078 A CN87104078 A CN 87104078A CN 87104078 A CN87104078 A CN 87104078A CN 87104078 A CN87104078 A CN 87104078A
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- titration
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- plunger
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Abstract
A kind of electronic measuring and analysis Instrument that is used for automatic titration becomes the electric signal that changes with the detected solution turbidity to light signal with photoelectric conversion technique, carries out titration automatically, judges titration end-point and metering.When closing on titration end-point, stir slowly soon and drip, to improve analysis precision.The judgement of titration end-point and stirring rate require adjustable according to analysis.Whole instrument is made up of photoelectric conversion unit, control module, agitating unit, digital metering pump and power-supply system, adopts digital metering pump to guarantee that measuring accuracy is ± 0.01ml, and instrument has fast, constant speed and titration mode at a slow speed automatically.The invention solves manual titration and judge the difficult and big shortcoming of personal error of terminal point, simple in structure, easy to operate.
Description
The present invention is a kind of electronic measuring and analysis Instrument, is mainly used in chemical titration analysis.
Most of titrimetries are to solve terminal point determining and titration metering.For the material that flocculation, precipitation reaction are arranged,, generally be that the color according to solution, the variation of turbidity are directly judged with eyes because China does not still have the analytical instrument of carrying out automatic titration at present.Because the variation of color, turbidity is obvious inadequately, different people's operations make errors of analytical results big, and for example, just there is this class problem in the manual titrimetry of People's Republic of China's standard " GB37805-83 " regulation.
The present invention utilizes photoelectric conversion technique according to the principle that occurs maximum turbidity in the coagulation reaction, and light signal is become the electric signal that changes with turbidity, realizes the automatic titration of detected solution and judges titration end-point automatically; With the automatic gauge of digital metering pump realization to volumetric soiutions.
Fig. 1 is an autotitrator structural principle block diagram.Autotitrator is made of photoelectric conversion unit, control module, agitating unit, digital metering pump and power-supply system.
1. photoelectric conversion unit is made up of light source (1), lens combination (2), titration cup (3), photoelectric commutator (4).Finish the conversion between the electric signal that light signal changes with turbidity, for the judgement of titration end-point provides signal to control circuit.The light that light source (1) sends forms and the vertical parallel beam of titration cup (3) through first lens.After assembling, second lens impinge upon on the photoelectric commutator (4) again.According to the technical indicator that the requirement (as judging color or turbidity variable condition) and the measured matter of titrimetry judgement are analyzed, each several part can be done corresponding selection in the opto-electronic conversion.When being used for the carbon black analysis, light source (1) is used DC
6V/3W bulb, two magnifications of lens combination (2) employing are 10 convex lens composition.It is the square quartz glass of 30ml～200ml that titration cup (3) adopts volume, and photoelectric commutator is for receiving the phototriode of optic angle greater than 15 degree.
2. control module (comprises the BG among Fig. 4 by controller (5)
1, BG
2, IC
1, IC
2, IC
3, BG
3, BG
4, J
1, J
2, J
d, J
s) and operating key (6) (comprising " power supply ", " imbibition ", " titration ", " stopping ", " rate selection switch " among Fig. 5) composition.Realize manual control, the automatic control of autotitrator.
3. agitating unit (is the motor M among Fig. 4 by the motor among Fig. 1 (7)
2), stirrer (8), stirrer (9) form.Realize detected solution and vs homogeneous reaction in the titration cup (3).
4. digital metering pump is made up of the volume pump among Fig. 1 (10), pulse shaping circuit (11), count display (12) and operating key (6).Realization is carried out automatic gauge to vs.
Fig. 2 is the volume pump structural representation.
It (is the motor M among Fig. 4 that volume pump adopts reversible electric machine (15)
1) make it have the function of forward and backward.Variator (16) is to increase (subtracting) fast gear set according to the design of different speed ratios, shift fork (24) plays the role of changing, " speed selection " switch among Fig. 5 is removed to " fast " position, then shift fork (24) is downward, volume pump plunger (18) upwards (or downwards) operation of speed to divide greater than 20ml/; " speed selection " switch among Fig. 5 is removed to " constant speed " position, and then shift fork (24) makes progress, and volume pump plunger (18) is with upwards (or the downwards) operation of 4ml/ component velocity.Screw rod is paid the measuring accuracy of (17), plunger (18) decision pump among Fig. 2.Frequency multiplier (19) is the transparent plate that tooth, groove are divided equally, and when autotitrator was used for the carbon black analysis, frequency multiplier (19) designed in 1: 100 ratio.Combined sealing ring (21) seals when plunger (18) is moved up and down in pumping cylinder (22).Three-way cock (23) decision vs sucks (or release) pumping cylinder (22), and vs sucks in the pumping cylinder (22) from the Sheng liquid device (13) of Fig. 1 during with its dextrorotation, and is left-handed then with the interior vs release of pumping cylinder (22).Screw rod is paid measuring accuracy that screw mandrel on (17) and high-precision plunger (18), combined sealing ring (21) and three-way cock (23) guarantee volume pump and is ± 0.01ml, upper and lower limit bit switch (25), the stroke of (26) decision plunger (18) in pumping cylinder (22).When plunger (18) rises (or decline) during to pumping cylinder (22) top (or bottom), upper and lower limit bit switch (25), (26) all cut off the power supply of reversible electric machine (15) and plunger (18) are stopped.
During volume pump work, frequency multiplier among Fig. 2 (19) rotates with it synchronously, its tooth, groove alternately by the photoelectric sensor (20) among Fig. 2, make the infrared light that the infrarede emitting diode in the BK sends among Fig. 4 be cut with the speed identical with frequency multiplier (19) with (or constant speed, at a slow speed) fast.The receiving end acquisition dutycycle of BK is 1 pulse signal, after pulse shaping circuit in Fig. 3 (11) shaping, produce count pulse CP and be input to counter shown in Figure 3 (27),, go up demonstration at charactron (30) through register (28), decoder driver (29).Fig. 3 is an autotitrator counting block diagram.
5. power-supply system, the power supply among Fig. 1 (14) adopts the integrated three-terminal regulator W shown in Fig. 4
317Form D.C. regulated power supply, export independently three-way direct current power supply V
1, V
2, V
3
Fig. 4 is the autotitrator electrical schematic diagram.
Principle of work of the present invention is:
One, measures preparation
1. start, instrument is in preheat mode
Press " power supply " key, contact 1-2 connection～220V, contact 4-5 connects, and " power supply " pilot lamp is bright, stabilized voltage supply output three-way power V
1, V
2, V
3
2. imbibition
Press " imbibition " key, contact 4-5 connects, and " imbibition " pilot lamp is bright.Volume pump reversible electric machine M among Fig. 4
1Driving voltage～127V via WK
2, " imbibition " key contact 2-1, relay J
d3-2 is added in motor M
12 ends, simultaneously, reversible electric machine M
1Control voltage～127V through relay J
s1-2 is added in motor M
13 ends, reversible electric machine M
1Counter-rotating, volume pump plunger (18) among Fig. 2 moves downward, vs from contain liquid device (13) in three-way cock (23) sucks pumping cylinder (22), when plunger (18) during down to pumping cylinder (22) bottom, lower position switch (26) is backed down, and cuts off reversible electric machine M
1Driving voltage, volume pump is out of service, instrument is in the titration state for the treatment of.
Two, titration
Press " titration " key, its contact 4-5 connects, and " titration " pilot lamp is bright, the automatic according to the following steps analysis to measure of autotitrator.
1. " titration " key contact 1-2 connects, and produces a pulse, produces return-to-zero pulse R ' after return-to-zero pulse shaping circuit (11) shaping in Fig. 3, is added in the IC among Fig. 4
6Each return-to-zero end, make the automatically return-to-zero of charactron (30) among Fig. 3.
2. " titration " key contact 11-10 connects, light source bulb D
1, D
2Bright.
3. constant speed titration
When controlling voltage～127V through relay J
s1-2 is added in reversible electric machine M
13 ends the time because bulb D
1, D
2Illumination, BG
1Conducting, IC2 exports high level, switch triode BG
2Conducting, relay J
1Action, J
1Contact 4-5 connect and to make relay J
dAction is then～127 through WK
1, " titration " key contact 7-8, relay J
d7-8 and J
d4-5 is added in reversible electric machine M by capacitor C o phase shift
11 end, reversible electric machine M
1Just change.Volume pump plunger (18) among Fig. 2 just moves upward with the constant speed that 4ml/ divides, and the vs in the pumping cylinder (22) is splashed in the titration cup (3) by the capillary titration pin (31) among Fig. 5 through three-way cock (23).
4. magnetic agitation
Relay J
1After the action, its contact J
d1-2 connects, stirring motor M
2Control voltage～15V through potentiometer W
3, relay J
23-2 is added in motor M
23 ends, motor M
2Driving voltage～100V after capacitor C o phase shift, be added in motor M
21 end, motor M
2The stirrer (8) that running drives among Fig. 1 rotates, and stirrer (8) is gone up opposite polarity magnet N, S rotates the ferromagnetism stirrer (9) in the titration cup (3) with it synchronously, makes detected solution and vs homogeneous reaction in the titration cup (3).Regulator potentiometer W
3Can change motor M
2The size of control voltage makes stirring rate variable.
5. stir slowly soon and drip
Along with the carrying out of titration, the solution turbidity of titration cup among Fig. 1 (3) lining increases gradually, and the light that then sees through titration cup (3) weakens, and impinges upon BG
3On light also weaken, when closing on maximum turbidity, BG
3Become by conducting and to end IC
3The output high level, switch triode BG
4Conducting, relay J
2Action, its contact J
21-2 connects, with potentiometer W
3Short circuit promptly is added in motor M to～15V
23 ends, motor M
2It is the fastest to obtain the maximum controlling voltage rotating speed, and stirrer is stirred soon.
Relay J
2Contact J
21-2 connects, relay J
sAction, its contact J
s1-2 disconnects, J
s3-2 connects, and then is added in reversible electric machine M
13 ends on control voltage become～30V reversible electric machine M by～127V
1Become at a slow speed by constant speed, volume pump (10) realizes dripping slowly (1ml/ branch).
6. judge titration end-point automatically
When titration reached terminal point, the solution turbidity of the titration cup among Fig. 1 (3) lining became maximum, made BG this moment
1The light that obtains is the most weak and end IC
2Output low level makes BG
2End relay J
1Discharge its contact J
14-5 disconnects and makes relay J
dDischarge.Relay J
d4-5 and J
d7-8 all disconnects, and cuts off reversible electric machine M
1Driving voltage～127V, reversible electric machine M then
1Stall, volume pump plunger (18) stop to rise titration are stopped, and count display (12) shows the titration final value.
Relay J
1Contact J
11-2 disconnection～15V, motor M
2Stall makes stirrer (8) stop to stir.
In automatic decision circuit and stirring control circuit, designed by resistance R
1, potentiometer W
1And resistance R
2, potentiometer W
2The resistor network of forming is regulated W
1Can make the judgement of titration end-point reach the analysis requirement of detected solution, regulator potentiometer W
2Realization is stirred soon ooze the existing time slowly variable.
Three, titration metering
Autotitrator is realized the judgement and the metering of titration end-point with the contactless optical power conversion technology.In Fig. 1, after the light transmission that light source (1) sends is equipped with the titration cup (3) of detected solution, impinge upon on the high-sensitive photoelectric commutator (4), the electric signal that obtains to change with solution turbidity is to control automatically.Designed digital metering pump simultaneously vs has been carried out automatic gauge.
When titration begins, the charactron among Fig. 3 (30) return-to-zero at first automatically.After volume pump reversible electric machine (15) rotates, producing dutycycle by frequency multiplier (19) in photoelectric sensor (20) is 1 pulse, the count pulse that pulse is sent among Fig. 3 forms circuit (11) (promptly adding IC4 by the BK output terminal among Fig. 4 through GO), after shaping, produce count pulse CP and send into decade counter (27) accumulated counts of starting from scratch, and show by charactron (30).When titration was reached home, titration stopped, frequency multiplier (19) stall, and photoelectric sensor (20) stops to send the detection pulse, and counter (27) stops counting, and the displayed value on the charactron (30) is the titer of accuracy of reading to ± 0.01ml.
The present invention has successfully solved present manual titration end-point and has judged that difficulty is big, the big shortcoming of direct-reading glass drop fixed tube error.The advantage that autotitrator has is:
1. only just realized titrimetry with three function keys in the operating key on the instrument panel (being " imbibition ", " titration ", " stopping " key among Fig. 5), and in titration at the end immediately rapidly, the precision with ± 0.01ml shows the titration final value exactly.
2. realize automatic titration, titration end-point judgement and automatic gauge, analysis result high conformity with highly sensitive contactless optical power conversion technology.
3. design the high digital metering pump of precision and resolving power, improved the measuring accuracy and the reliability of vs volume (milliliter number).
4. when the present invention is used for the mensuration of carbon black specific surface, only use half component analysis of national standard " GB37805-83 " regulation just to reach measuring error less than ± 0.75m
2/ g, the measuring error that is better than this standard code is not more than ± 1.5m
2The requirement of/g.
5. the present invention is simple in structure, and operation, easy to maintenance has test analysis effect fast and accurately.
Fig. 5 is the autotitrator shape assumption diagram.
The method of manipulating of the present invention is:
1. press " power supply " key among Fig. 5, connection～220V, instrument is in preheat mode.
2. three-way cock (23) dextrorotation, " speed selection " switch is screwed into " fast " position, presses " imbibition " key, and plunger (18) moves downward, vs promptly from contain liquid device (13) in three-way cock (23) sucks volume pump pumping cylinder (22).When plunger (18) arrived pumping cylinder (22) bottom down, instrument stopped automatically.
3. press " stopping " key, instrument is in the titration state for the treatment of.
4. by the titrimetry requirement detected solution is put into quartz glass titration cup (3), then titration cup (3) is placed a glass groove (32)." speed selection " switch is screwed into " constant speed " position, and three-way cock (23) is left-handed.
5. press " titration " key, the automatic return-to-zero of instrument, plunger (18) rises with the 4ml/ component velocity, vs is splashed into the titration cup (3) by capillary titration pin (31) through three-way cock (23) in pumping cylinder (22), simultaneously, charactron (30) is started from scratch to add up and is shown vs volume (milliliter number).
6. when titration closed on maximum turbidity, instrument was realized " stir slowly soon and drip ", and solution is through stirring the generation maelstrom soon in the titration cup, and capillary titration pin drips slowly, and charactron (30) accumulated counts is slack-off.
7. when being titrated to maximum turbidity, instrument stops titration, and stirrer stops to stir, and charactron (30) shows the titration final value.
8. press " stopping " key, take out titration cup (3), prepare to measure next time.
Claims (8)
1, a kind of electronic measuring and analysis Instrument of automatic titration, form by photo-electric conversion element, count display, control circuit and power-supply system, the circuit that it is characterized in that photoelectric conversion unit, control module and digital metering pump, by the effect of control module loop and operating key, realize judging to the automatic titration of detected solution, automatically terminal point and to the automatic gauge of vs.
2, instrument according to claim 1 is characterized in that photoelectric conversion unit is made up of light source (1), lens combination (2), titration cup (3), photoelectric commutator (4).Finish light signal with the conversion between the electric signal of turbidity variation.
3, instrument according to claim 2 is characterized in that it is the square quartz glass of 30ml～200ml that titration cup (3) adopts volume.
4, instrument according to claim 2 is characterized in that in the resistance measurement network of photoelectric commutator (4) regulator potentiometer W
1Can make the judgement of titration end-point reach the analysis requirement of detected solution, regulator potentiometer W
2Realization is stirred soon ooze the existing time slowly variable.
5, instrument according to claim 1, it is characterized in that volume pump (10) by reversible electric machine (15), variator (16), screw rod pay (17), shift fork (24), frequency multiplier (19), plunger (18), combined sealing ring (21), pumping cylinder (22) is formed.
6, instrument according to claim 5, it is characterized in that volume pump when work, frequency multiplier (19) rotates with it synchronously, its tooth, groove by (or constant speed, at a slow speed) fast alternately by photoelectric sensor (20), the receiving end acquisition dutycycle that makes BK is 1 Pulse Electric signal, through GO, IC
4Produce count pulse CP input count display (12), adding up on charactron (30) shows the volume of vs.
7, instrument according to claim 5, it is characterized in that upwards (or downwards) motion of plunger (18), when arriving the top (or bottom) of pumping cylinder (22), upper and lower limit bit switch (25), (26) are backed down (or decline) when plunger (18) rises, and cut off reversible electric machine M
1Driving voltage volume pump (10) is stopped automatically.
8, instrument according to claim 1 is characterized in that in the agitating unit, regulator potentiometer W
3Can change motor M
2Control voltage and make motor M
2Rotating speed variable, realize solution homogeneous reaction in the titration cup (3) by stirrer (8) and stirrer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87104078 CN1009956B (en) | 1987-06-02 | 1987-06-02 | Automatic titrator for turbidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87104078 CN1009956B (en) | 1987-06-02 | 1987-06-02 | Automatic titrator for turbidity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87104078A true CN87104078A (en) | 1988-01-20 |
| CN1009956B CN1009956B (en) | 1990-10-10 |
Family
ID=4814716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87104078 Expired CN1009956B (en) | 1987-06-02 | 1987-06-02 | Automatic titrator for turbidity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009956B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528521A (en) * | 1994-05-27 | 1996-06-18 | Hoffmann-La Roche Inc. | Titration emulation system and method |
| CN1036735C (en) * | 1993-03-26 | 1997-12-17 | 马德举 | Titration apparatus |
| CN104215588A (en) * | 2013-05-30 | 2014-12-17 | 上海勇规分析仪器有限公司 | Titration apparatus capable of adjusting titration and color inspection condition |
| CN104964972A (en) * | 2015-06-30 | 2015-10-07 | 开平市中青环保技术服务有限公司 | Method and apparatus for determining titration end point and realizing automatic titration analysis by means of vision sensor |
| CN105403660A (en) * | 2015-12-16 | 2016-03-16 | 济南海能仪器股份有限公司 | Titration reaction apparatus |
| CN105606761A (en) * | 2015-12-23 | 2016-05-25 | 深圳市清时捷科技有限公司 | Reaction endpoint judgment device and five-step iodometry |
| CN105717111A (en) * | 2016-04-29 | 2016-06-29 | 中储粮成都粮食储藏科学研究所 | Automatic titration device capable of detecting change in colour of solution based on machine vision and detection method thereof |
| CN106290704A (en) * | 2015-06-23 | 2017-01-04 | 中美华世通生物医药科技（武汉）有限公司 | Titration system and titration method |
| CN106770908A (en) * | 2016-11-21 | 2017-05-31 | 中国水产科学研究院黄海水产研究所 | A kind of multi-functional titrator of high flux and application method |
-
1987
- 1987-06-02 CN CN 87104078 patent/CN1009956B/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036735C (en) * | 1993-03-26 | 1997-12-17 | 马德举 | Titration apparatus |
| US5528521A (en) * | 1994-05-27 | 1996-06-18 | Hoffmann-La Roche Inc. | Titration emulation system and method |
| CN104215588A (en) * | 2013-05-30 | 2014-12-17 | 上海勇规分析仪器有限公司 | Titration apparatus capable of adjusting titration and color inspection condition |
| CN106290704A (en) * | 2015-06-23 | 2017-01-04 | 中美华世通生物医药科技（武汉）有限公司 | Titration system and titration method |
| CN104964972A (en) * | 2015-06-30 | 2015-10-07 | 开平市中青环保技术服务有限公司 | Method and apparatus for determining titration end point and realizing automatic titration analysis by means of vision sensor |
| CN105403660A (en) * | 2015-12-16 | 2016-03-16 | 济南海能仪器股份有限公司 | Titration reaction apparatus |
| CN105606761A (en) * | 2015-12-23 | 2016-05-25 | 深圳市清时捷科技有限公司 | Reaction endpoint judgment device and five-step iodometry |
| CN105717111A (en) * | 2016-04-29 | 2016-06-29 | 中储粮成都粮食储藏科学研究所 | Automatic titration device capable of detecting change in colour of solution based on machine vision and detection method thereof |
| CN106770908A (en) * | 2016-11-21 | 2017-05-31 | 中国水产科学研究院黄海水产研究所 | A kind of multi-functional titrator of high flux and application method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009956B (en) | 1990-10-10 |
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