CN85201771U - Automatic chromatograph with microcomputer control and data processing - Google Patents

Abstract

The utility model discloses an automatic chromatograph with microcomputer control and data processing, and belongs to an analysis instrument. The automatic chromatograph with microcomputer control and data processing is mainly composed of a microcomputer (1), an input and output interface (2), an itinerant sampler (3), an automatic sampling and sample feeding system (4), an automatic zero adjusting system (5), a mould / number conversion circuit (6), a printer (7) and a chromatograph signal generation portion (8). The automatic chromatograph with microcomputer control and data processing is mainly used as an on-line analyzer under the condition that no persons operates machines in laboratories and factories. The automatic chromatograph with microcomputer control and data processing has the advantages that the hydraulic centrifugal panning device is not operated manually, and can automatically analyze one to six kinds of the samples of different gases, the analytic results printed are simple and legible, and the procedure is changed conveniently and reliably. The utility model has the advantages of high stability, simple structure, low cost and small working disk to be maintained.

Description

Automatic chromatograph with microcomputer control and data processing

The utility model is the automatic analytical instrument that a kind of gas ingredients that is used for laboratory or factory scene is analyzed.

Domestic various laboratories chromatograph and industrial chromatograph, 2300 palette spectrometers as Beijing Analytical Instrument Factory, 100 serial gas chromatographs of Shanghai analytical instrument factory, the CX-2A industrial gas chromatograph of Nanjing analytical instrument factory and CX serial experiment chamber gas chromatograph, and the relevant technologies file of the SC series gas chromatograph of Sichuan analytical instrument factory, all understanding of the present utility model, retrieval, examination there are reference role.

In existing technology, general chromatograph often will lean on hand sampling, sample introduction and carry out data processing, can not on-line analysis.Some existing industrial chromatographs, as the CX-2A industrial chromatograph, SQG Series Industrial gas chromatograph etc., owing to adopt hardwire logic, in programmed control, lack dirigibility, and do not have data processing equipment, add some reason of configuration aspects, make their long-time stability and repeatability not to satisfy the demand, therefore can not become gratifying in-line analyzer.

The purpose of this utility model is with a microcomputer chromatograph to be managed automatically, promptly carries out programmed control and data processing, finally prints analysis result.So just realized whole robotizations of analysis operation, can manually operate and data processing.Produce part at chromatographic signal, the utility model has been taked special measure, to improve the stable and repeated of instrument long-term operation, makes it to become gratifying in-line analyzer, to satisfy scientific experiment or industrial needs.

Fig. 1 is the complete machine block scheme.

Fig. 2 is sampling system and the chromatographic signal generation structural representation partly of taking a sample automatically.

Fig. 3 is an automatic zero set (AZS) system principle circuit diagram.

Fig. 4 is the processing synoptic diagram of integral heater (14).

Implementation of the present utility model is as follows: referring to Fig. 1, the microcomputer (1) of the special-purpose solidification software of built-in (program sees 7～10 pages in instructions for details) is finished following stratographic analysis operation element by the following external equipment of IO interface (2) control: (a) control Xun rotation sampling thief (3) is finished the stream switching, its objective is that wherein a kind of analytic sample of selection feeds instrument, so this instrument can carry out sequence analysis to 1～6 kind of gaseous sample; (b) sampling operation and sample introduction operation to analyzed sample are finished in control sampling sampling system (4) action automatically, make analyzed sample gas enter the chromatographic column that chromatographic signal produces part (8); (c) the baseline adjusted process is finished in control automatic zero set (AZS) system (5) action.Chromatographic signal produces chromatographic signal (voltage signal) that part (8) produces and converts digital signal to by mould/number conversion circuit (6) and deliver to microcomputer (1) and carry out data processing, the peak that rises of each component will be judged, summit and tail of the peak, and on display, demonstrate out the situation at peak, when it thinks that the peak of certain component is over time the peak base, just calculate the percentage composition of component, and control printer (7) prints analysis result.In addition, also print sample time sampling spot code, and relevant sign.

The utility model is also used the display of microcomputer, with different characters, shows the duty of instrument.

Produce part at chromatographic signal, the utility model has adopted heating element is cast in the special constant temperature system that the integral heater of making in the derby is a heating source, improved the constant temperature precision, simultaneously the quantitative sample injection pipe is contained in the constant temperature oven, avoid sample size with the error that variation of ambient temperature causes, improved the stable and repeated of whole instrument.

The advantage that the utility model is compared with prior art had is: without manually-operated, all realize analyzing automatically; Can carry out sequence analysis to 1～6 kind of gas with various sample; The analysis result that prints is simple and clear, has avoided personal error; Reprogramming convenient, reliable (for example will change the analytical cycle of a sample, only need on keyboard the 24C8 toward RAM district, the every minute and second numeral that the input of 24C9 unit needs just can be from several seconds to tens even hundreds of minute continuous variation); Instrument long-term operation good stability, noise in operating is little, and is simple in structure, and maintenance workload is little, and production cost is low.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Microcomputer as control and data processing can form with a TP801 single card microcomputer transformation of the way, and used specific program is solidificated in two EPROM slice, thin pieces, and the address is from 0800～17FF, and program listing sees 7～10 pages in this instructions for details.The PIO mouth of single card microcomputer have output signal line respectively Yu Xun rotation sampling thief (3), automatically take a sample sampling system (4), automatic zero set (AZS) system (5) link to each other control their move, finish programme controlled function.When needs are changed sample flow path, pulse signal of single card microcomputer output rotates 60 ° Dao the driven by motor QF-06 type gas six-way valve of Xun rotation sampling thief (3) Shi Xun rotation sampling thief (3), makes automatic sampling, the sampling system (4) of the sample gas feeding instrument of next stream.

Fig. 2 is sampling system and the chromatographic signal generation structural representation partly of taking a sample automatically.(9) are a plane six-way valve among the figure, when spool is in a certain conduction position, three passages of its six export mixes (three solid line passages among Fig. 2 for example, we claim six-way valve to be in the sample position), when 60 ° of valve core rotation, same other three passages of six export mixes (for example three dotted line passages among Fig. 2, we claim six-way valve to be in the sample introduction position).As can be seen from Figure 2, six-way valve (9) is when being in the sample position, and carrier gas enters chromatographic column (11) back by thermal conductance assessor (12) emptying again by a solid line passage of sampling six-way valve (9).Sample gas enters quantitative sample injection pipe (10) and returns the last emptying of another solid line passage again by a solid line passage of sampling six-way valve (9), quantitative sample injection pipe (10) lining has been full of sample gas to be analyzed after a period of time like this, reaches the purpose of sampling.When six-way valve (9) was in the sample introduction position, sample gas was by the direct emptying of dotted line passage of six-way valve (9); The dotted line passage of carrier gas by six-way valve (9) enters and enters chromatographic column (11) after another dotted line passage that returns six-way valve (9) behind the quantitative sample injection pipe (10) goes out six-way valve (9), so just the sample gas to be analyzed of quantitative sample injection pipe (10) lining is brought in the chromatographic column (11), reach the purpose of sample introduction.Six-way valve (9) is driven by the reversible electric machine that links to each other with it, and turning to by microcomputer (1) of reversible electric machine controlled.During this sampling, microcomputer (1) sends signal by IO interface (2) to reversible electric machine, and the reversible electric machine clockwise direction is rotated, and drives when six-way valve forwards the sample position to and stops, and finishes sampling operation; In like manner, reversible electric machine rotates counter-clockwise direction during this sample introduction, drives when six-way valve forwards the sample introduction position to stop, and finishes the sample introduction operation.

Fig. 3 is an automatic zero set (AZS) system principle circuit diagram.R1, R2, R3, R4 are four arm resistances of thermal conductance assessor among the figure, and connection is identical with the chromatographic connection of SP2305 type.Wherein Wcp is a pond balance adjustment potentiometer, and WT is a zero potentiometer, and general chromatograph is to use manual manual shift.This instrument links the rotating shaft of zero potentiometer WT by the rotating shaft of a gear train with zeroing reversible electric machine (20).Turning to of zeroing reversible electric machine (20) is subjected to microcomputer (1) control, the signal of exporting when electric bridge (potential difference (PD) between Voutl and the Vout2) is timing, zeroing reversible electric machine (20) clockwise rotates, and zero potentiometer WT central contact is moved down, and the electric bridge output signal reduces; Otherwise, when the electric bridge output signal when negative, zeroing reversible electric machine (20) inhour is rotated, and zero potentiometer WT central contact is moved up, electric bridge output signal current potential raises; Have only when the electric bridge output signal equates with the predetermined baseline value, microcomputer (1) just output signal stops operating zeroing reversible electric machine (20), reaches the purpose that baseline is adjusted.The characteristics of this automatic zero set (AZS) circuit are only just easily baseline to be transferred to the position of any setting with little hardware, and repeatability is good.

Chromatographic signal produces part by thermal conductivity cell detector (12), testing circuit stabilized voltage supply (13), integral heater (14), constant temperature control circuit (15) and stay-warm case (18) etc. are formed (referring to Fig. 2), thermal conductance assessor (12) wherein, stabilized voltage supply (13), constant temperature control circuit (15) all is the circuit of using always, not in this repetition.

The utility model has adopted special constant temperature system.General chromatographic constant temperature system adopts electric furnace heating wire to add hot-air, send hot blast that whole constant temperature oven is heated up with fan blower.Its shortcoming is: the blower fan rotational noise is big, need safeguard that blower fan runs well by (as apply oil etc.), is unsuitable for using continuously for a long time.The constant temperature system that the utility model adopts is seen Fig. 2, and one of its characteristics are heating element (16) to be cast in make integral heater (14) in the derby.Chromatographic column (11) all is close to integral heater (14) surface with thermal conductance assessor (12), and the outside is covered stay-warm case (18) again.Its advantage is that chromatographic column (11) all is in same temperature layer with thermal conductance assessor.Directly conduct heat by metal, the having a narrow range of temperature of the useful space.It has saved the motor that air blast is used, and need not safeguard rotating machinery, the noise when having reduced instrument work simultaneously.Two of its characteristics are middle parts that thermostatically controlled point for measuring temperature is chosen in the well heater derby, the thermometric platinum resistance (17) that temperature control is soon used is inserted the thermometer hole (19) at integral heater (14) middle part, and is near apart from thermal source, and reflection is responsive, it is little to lag behind, so temperature persistance is good.Long-term serviceability temperature is drifted about less than 0.2 ℃/hour, in 24 hours＜0.5 ℃.It three is that quantitative sample injection pipe (10) is put in the stay-warm case (18), is close to another surface of integral heater (14), and advantage is to help sample size to keep constant, and this has very big benefit to the repeatability that improves the instrumental analysis result.The quantitative sample injection pipe of general instrument all is exposed in the air, and sample size changes with the variation of environment temperature.If sample gas is regarded as ideal gas, according to equation of state PV=NRT as can be known, when environment temperature t variation ten was spent, the sample size volume promptly changed 1/ (273+t) * 10, establishes t=20 ℃, and can produce about 3.4% error this moment.The quantitative sample injection pipe is put into constant temperature oven, the error of having avoided sample size to cause with variation of ambient temperature.

Fig. 4 is the processing synoptic diagram of integral heater (14).It is characterized in that heating element (16) is cast in the derby, mounting plane and each mounting hole have been reprocessed, wherein the B face will be processed the fixed orifice of thermal conductance assessor and chromatographic column, and the C face will process the fixed orifice of thermometer hole (19) and electric furnace heating wire extension line porcelain connector and other installs and fixes the hole that needs.

Process integral heater (14) by Fig. 4, with chromatographic column (11), thermal conductance assessor (12) is fixed on the surperficial B of integral heater (14); Quantitative sample injection pipe (10) is fixed on the surface C of integral heater (14), by the power supply lead wire that connects stabilized voltage supply (13) to thermal conductance assessor (12) shown in Figure 2; The thermometric platinum resistance is inserted thermometer hole (19), signal is guided to constant temperature control circuit (15), two statures that heating power supply is guided to well heater (16) from constant temperature control circuit (15) connect again, at last the gas circuit pipeline is connected by Fig. 2, stay-warm case on the outer mask (18) has promptly been finished the installation that chromatographic signal produces part.Automatically the six-way valve (9) that sampling sample introduction is used is fixed on the place near constant temperature oven, by Fig. 1, the gentle connecting pipe line of signal wire that connects control usefulness shown in Figure 2, the installation of whole instrument has just been finished substantially, as for shell, can make various forms, not have specific (special) requirements.

Attached: the program curing inventory

Claims (6)

1, the automatic chromatograph of system controlled by computer and data processing, it is by microcomputer (1), IO interface (2), touring sampling thief (3), automatic sampling, sampling system (4), automatic zero set (AZS) system (5), mould/number conversion circuit (6), printer (7), chromatographic signal produce part (8) to be formed, and it is characterized in that:

A, microcomputer (1) respectively with IO interface (2), mould/number conversion circuit (6), printer (7) is connected.

B, IO interface (2) respectively with touring sampling thief (3), automatically sampling, sampling system (4), automatic zero set (AZS) system (5) is connected.

C, touring sampling thief (3) are connected with the sampling system (4) of taking a sample automatically.

D, chromatographic signal produce part (8) respectively with automatic sampling, sampling system (4), automatic zero set (AZS) system (5), mould/number conversion circuit (6) is connected.

2, chromatograph according to claim 1 is characterized in that microcomputer (1) adopts the special-purpose solidification software with built-in, and its program sees 7～10 pages in instructions for details

3, chromatograph according to claim 1, it is characterized in that in automatic sampling, the sampling system (4) reversible electric machine respectively with six-way valve (9), IO interface (2) is connected.

4, chromatograph according to claim 1, it is characterized in that in the automatic zero set (AZS) system zeroing reversible motor (20) respectively with the rotating shaft of zero potentiometer WT, IO interface (2) is connected.

5, chromatograph according to claim 1, it is characterized in that it is to adopt integral heater (14) as heating source that chromatographic signal produces part (8), chromatographic column (11), thermal conductance assessor (12) all is fixed on the surface of integral heater (14), outer cover stay-warm case (18) is formed constant temperature system, and quantitative sample injection pipe (10) enters stay-warm case (18) the inside.

6, chromatograph according to claim 1 or 5, it is characterized in that integral heater (14) is cast in the derby by heating element (16) constitutes, be drilled with thermometer hole (19) on its two sides respectively, be used to install the fixed orifice of thermal conductance assessor (12), chromatographic column (11) and other heating object.

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