CN2504641Y - In-line auto analyzer for permanganate exponent - Google Patents

Abstract

An automatic on-line permanganate index analyzer comprises an automatic sampler, an automatic metering titration device, a titration cell with a reflex condensing tube and a photometric detector. A microprocessor control system collects various data from the above units and controls automatic analysis and display. The utility model is characterized in that the automatic metering titration device is a connecting and switch device for the liquid inlet tube and the liquid injection tube catching the reagent as a high-precision piston pump through an electric multi-channel valve with eight channels. The photometric signals control circuit of the microprocessor can adjust the sampling and injecting amount of H 2 S O 4, K M n O 4 and N a 2 C 2 O 4, and the precision can reach 0.87 Mu l 1 per step. The automatic sampling device comprises a sampling tube and a distilled water tube connected with a front electromagnetic triple valve, a peristaltic pump, a back electromagnetic triple valve, a ball-shaped quantitative cup and a sample injection tube in sequence. The reflex condensing tube in the upper part of the titration cell is of strong wind cold type, and the lower part is provided with an injection hole for H 2 S O 4, K M n O 4 and N a 2 C 2 O 4, and an emptying mouth connected with the peristaltic pump, a temperature control heater, a photoelectric detector and a magnetic stirring apparatus. The utility model has the advantages of easy installation and precise and fast measurement.

Description

Automatic in-situ permanganate index analyzer

Technical field: the utility model relates to chemical photomatrix titrimetric analysis instrument, relates in particular to the technological improvement of online Analysis Apparatus of Permanganate Index device in the environmental water quality monitoring.

Background technology: chemical oxygen demand (COD) (COD) is an important indicator of environmental monitoring, and at present, the domestic chromic salts on-line analysis methods that adopt are surveyed COD more _Cr, promptly with potassium dichromate as clearing up agent, be mainly used in industrial waste water monitoring; But for surface water monitoring, permanganate index (COD _Mn) more important, and to measure aspect the permanganate index, the domestic manual titrimetrys that adopt exist length consuming time (about 40 minutes/sample), labour intensity big more, can not satisfy the needs of on-line monitoring; In the world, the online Analysis Apparatus of Permanganate Index of the Seres2000 type that existing France produces is put on market, but because it is to adopt the adopting of peristaltic pump control sample liquid and all reagent, notes and volume metering, so its analysis precision is difficult to guarantee.In addition, the condensing reflux that it need guarantee titration cell with external cooling water source endlessly can not adapt to domestic many scenes, the open-air actual conditions of analyzing monitoring, has limited its range of application.

Summary of the invention: technical problem to be solved in the utility model be a kind of titrimeter accuracy of measurement height will be provided, measure accurately, favorable reproducibility, automaticity height, operating cost are low, the automatic in-situ permanganate index analyzer being convenient to install under the environmental monitoring field condition at home.

For this reason, the technical solution of the utility model is: a kind of automatic in-situ permanganate index analyzer, it is by automatic sampler, the automatic gauge titrator, titration cell and all unit of photometric detector of taking back the stream condenser pipe connect composition in regular turn, and gather Various types of data respectively from above-mentioned all unit by control system, the control analysis instrument carries out titrimetry automatically after the data processing, show, it is characterized in that: described automatic gauge titrator, be to adopt electronic multiple valve, as high precision piston pump butt joint feed tube, the coupling arrangement of liquid injection pipe and adopt liquid, the switching device shifter of fluid injection state.

Described electronic multiple valve is eight channel-types; Its valve opening is divided into three groups, and wherein A group valve opening is connected H respectively ₂SO ₄Groove, KMnO ₄Groove, Na ₂C ₂O ₄Groove, high precision piston pump of B group each self-closing of valve opening, C group valve opening manifold closes the back and connects the titration cell filling orifice.

Described control system is made up of single-chip microcomputer and output/input peripheral thereof, its be provided with photometric signal to adopt, the control loop of reservoir quantity, can control described high precision piston pump according to the luminosity value in the titration cell, realize H ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Collection, the adjusting of injection rate IR.

Described automatic sampler mainly is to be composed in series by sampling pipe and distillation water pipe, preceding three-way solenoid valve, peristaltic pump, back three-way solenoid valve, ball shape quantitative cup and injection sample tube.

Described titration cell top is the injection port of band high wind condensing recirculatory pipe, and the bottom is provided with H ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Filling orifice and the evacuation port of pond liquid, on evacuation port, also be connected with peristaltic pump; Temperature control well heater, photometric detector, magnetic stirring apparatus have also been set up in the titration cell middle and lower part.

Described high precision piston pump is made of the stepper motor driven syringe of metering, and it is adopted, the measuring accuracy of fluid injection reaches the 0.87 μ l/ step.

The utility model cooperates electronic multiport valve owing to adopted high precision to annotate the plug pump, makes reagent adopt, annotate precision and is increased to micro updating greatly; Sample is adopted, is annotated and adopts peristaltic pump to join ball shape quantitative cup, three-way solenoid valve etc., has overcome peristaltic pump to adopt, annotate the not high shortcoming of precision; And said structure has comprehensively improved measurement accuracy, the reappearance of instrument again; Because all raisings greatly of precision are annotated in adopting of reagent, sample liquid, so structural volume such as titration cell can reduce, reagent, the energy etc. consumptions are reduced, thereby have reduced operating cost; The condensing reflux pipe of titration cell adopts air blast cooling, facts have proved that it does not only influence the condensing reflux effect, and the whole scope of application of instrument is significantly enlarged, be convenient to instrument in the open air, the scene installs and uses; Join with single-chip microcomputer to many rings of all detecting units, coordinate control and comprise: the step motor drive multiple valve, flexibly set heating-up temperature/time, peristaltic pump sample automatically, emptying etc., realized full unit, global function, the strong robotization of coordinating, make this instrument be suitable for online, at a high speed, the test of high-precision environmental monitoring and analysis.

Description of drawings: the utility model is made an explanation below in conjunction with accompanying drawing.

Fig. 1 is the structural principle synoptic diagram of the utility model embodiment.

Fig. 2 adopts the liquid status synoptic diagram for the electronic multiple valve of the utility model embodiment.

Fig. 3 is the electronic multiple valve fluid injection view of the utility model embodiment.

Embodiment: as shown in Figure 1: the embodiment of automatic in-situ permanganate index analyzer, it is by automatic sampler, the automatic gauge titrator, titration cell and all unit of photometric detector of taking back the stream condenser pipe connect composition in regular turn, and gather Various types of data (data acquisition is represented with the dotted line of " coming to arrow ") respectively from above-mentioned all unit by single-chip microcomputer 4, the control analysis instrument carries out titrimetry automatically after the data processing, show (control relation is represented with the dotted line of " whereabouts arrow "), wherein output/input peripheral 4-1 realizes data presentation and man-machine communication, it is characterized in that: described automatic gauge titrator, it is the electronic multiple valve 1 that adopts eight channel-types, as high precision piston pump B1, B2, B3, B4 docks feed tube, the coupling arrangement of liquid injection pipe and adopt liquid, the switching device shifter of fluid injection state: its valve opening is divided into three groups, wherein four valve opening pipe A1 of A group, A2+A3, A4 connects H respectively ₂SO ₄Groove, KMnO ₄Groove, Na ₂C ₂O ₄Groove, B group four each self-closings of valve opening high precision piston pump B1, a B2, B3, B4, C group valve opening pipe four C1, C2, C3, C4 converge the filling orifice 3 that titration cell 2 is connected in the back.

Described single-chip microcomputer 4 be provided with photometric signal to adopt, the control loop of reservoir quantity, can realize H according to the described high precision piston pump B1 of 5 controls of the luminosity value in the titration cell 2, B2, B3, B4 ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Collection, the adjusting of injection rate IR.

Described automatic sampler is to be connected sampling cup 6 and sample liquid filter tube 21, distilled water pipe connection distillation tank 7 by sampling pipe, and then three-way solenoid valve 8, peristaltic pump 9, back three-way solenoid valve 10 before sampling pipe and distillation water pipe connected in turn, and ball shape quantitative cup 11 and injection sample tube 12 are composed in series with back three-way solenoid valve 10 respectively again.

Described titration cell 2 tops are injection ports 14 of band condensing recirculatory pipe 13, and condensing recirculatory pipe 13 is to carry out the forced heat radiation cooling by air blast cooling electric fan 15, and titration cell 2 bottoms are provided with H ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Filling orifice 3 and the evacuation port 16 of pond liquid, on evacuation port 16, also be connected with peristaltic pump 17; Temperature measuring head 18-0 and temperature control well heater 18, photometric detector 19, magnetic stirring apparatus 20 have also been set up in titration cell 2 middle and lower parts.

Described high precision piston pump B1, B2, B3, B4 are made of the syringe that metering stepper motor (not shown) drives, and it is adopted, the measuring accuracy of fluid injection reaches the 0.87 μ l/ step.

Introduce detected sample liquid when power-on and enter sample liquid filter tube 21, three-way solenoid valve 8 was closed the distillation water pipe, is made sampling pipe be communicated with sampling cup 6 before single-chip microcomputer 4 was promptly controlled, control back three-way solenoid valve 10 is closed injection sample tube 12 and is communicated with ball shape quantitative cup 11, and start peristaltic pump 9 simultaneously and extract the sample liquid through sampling cup 6 to ball shape quantitative cup 11 from sample liquid filter tube 21, although the measuring accuracy of peristaltic pump 9 is not high, but automatic constant through ball shape quantitative cup 11 fixed volume, can eliminate the sampling quantity fluctuation, guarantee sampling with high precision; Sampling is finished, and single-chip microcomputer 4 control back three-way solenoid valves 10 are closed with being connected of peristaltic pump and are communicated with ball shape quantitative cup 11 and liquid injection pipe 12, to injection port 14 sample introductions of titration cell 2.

Single-chip microcomputer 4 control instruments enter following to H subsequently ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Adopt, the notes process.

As shown in Figure 1, 2: the valve opening stream of electronic multiple valve 1, by be close to and can around axle in relative rotation two valve block stator 1-1, and rotor 1-2 (all launching expression) institute form, solid line among stator 1-1 and the rotor 1-2 is represented the valve block internal path, the sealing of cross " * " expression path, the solid arrow express liquid flows to (down together).On stator 1-1, high precision piston pump B1, B2, B3, valve opening that B4 connects are alternate in turn; On rotor 1-2, fluid injection stream C1, C2, C3, valve opening that C4 connects are alternate in turn, and feed liquor stream A1, A2, A3, valve opening that A4 connects are also alternate in turn, and A3, A2 all connect KMnO ₄Groove, fluid injection stream C1, C2, C3, valve opening that C4 connects are adjacent in turn with feed liquor stream A1, A2, A3, valve opening that A4 connects again; Be right after after sample liquid capture program among Fig. 1 finishes, the rotor 1-2 of the electronic multiple valve 1 of single-chip microcomputer 4 controls rotates and switches: high precision piston pump B1, B2, B3, B4 are docked and connected with feed liquor stream A1, A2, A3, A4 respectively, and the drive stepping motor (not shown) drives high precision piston pump B1, B2, B3, B4 respectively to H ₂SO ₄Groove, KMnO ₄Groove, Na ₂C ₂O ₄Groove measures drawing liquid.

Shown in Fig. 1,3: the fluid injection program is finished, changed over to above-mentioned metering drawing liquid program, the rotor 1-2 of the electronic multiple valve 1 of single-chip microcomputer 4 controls rotates and switches: high precision piston pump B1, B2, B3, B4 and fluid injection stream C1, C2, C3, C4 are docked and connected, and feed liquor stream A1, A2, A3, A4 is vacant, and the drive stepping motor (not shown) drives high precision piston pump B1, B2, B3, B4 according to the program of setting and does the metering fluid injections to titration cell 2 bottom filling orifices 3 respectively; This moves simultaneously, the intensification of the whole titration cell of single-chip microcomputer 4 controls 2 systems, stirring, photometry reach titration end-point up to luminosity generation transition and end, wherein, high wind condensing recirculatory pipe 13 is gone into titration cell 2 with the solution condensing reflux that heated volatile comes out, with accuracy, the reappearance that guarantees to analyze; Single-chip microcomputer 4 is to output/input peripheral 4-1 output testing result and record, then, single-chip microcomputer 4 drives forward and backward three-way solenoid valve 8,10, peristaltic pump 9,17 interoperations again, implements to get rid of raffinate, extracts distilled water detergent line and titration cell 2, the analysis cycle that enters the next round sample then.

Claims (6)

1, a kind of automatic in-situ permanganate index analyzer, by automatic sampler, automatic gauge titrator, take back the stream titration cell of condenser pipe and all unit of photometric detector and connect in regular turn and form, and gather Various types of data respectively from above-mentioned all unit by control system, the control analysis instrument carries out titrimetry, demonstration automatically after the data processing, it is characterized in that: described automatic gauge titrator, be to adopt electronic multiple valve, as the coupling arrangement of high precision piston pump butt joint feed tube, liquid injection pipe and adopt the switching device shifter of liquid, fluid injection state.

2, automatic in-situ permanganate index analyzer as claimed in claim 1 is characterized in that: described electronic multiple valve is eight channel-types; Its valve opening is divided into three groups, and wherein A group valve opening is connected H respectively ₂SO ₄Groove, KMnO ₄Groove, Na ₂C ₂O ₄Groove, high precision piston pump of B group each self-closing of valve opening, C group valve opening manifold closes the back and connects the titration cell filling orifice.

3, the automatic in-situ permanganate index analyzer described in claim 1 or 2, it is characterized in that: described control system is made up of single-chip microcomputer and output/input peripheral thereof, its be provided with photometric signal to adopt, the control loop of reservoir quantity, can control described high precision piston pump according to the luminosity value in the titration cell, realize H ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Collection, the adjusting of injection rate IR.

4, automatic in-situ permanganate index analyzer as claimed in claim 3 is characterized in that: described automatic sampler mainly is to be composed in series by sampling pipe and distillation water pipe, preceding three-way solenoid valve, peristaltic pump, back three-way solenoid valve, ball shape quantitative cup and injection sample tube.

5, automatic in-situ permanganate index analyzer as claimed in claim 4 is characterized in that: described titration cell top is the injection port of band high wind condensing recirculatory pipe, and the bottom is provided with H ₂SO ₄, KMnO ₄, Na ₂C ₂O ₄Filling orifice and the evacuation port of pond liquid, on evacuation port, also be connected with peristaltic pump; Temperature control well heater, photometric detector, magnetic stirring apparatus have also been set up in the titration cell middle and lower part.

6, automatic in-situ permanganate index analyzer as claimed in claim 5 is characterized in that: described high precision piston pump is made of the stepper motor driven syringe of metering, and it is adopted, the measuring accuracy of fluid injection reaches the 0.87 μ l/ step.

Images