CN1815219A - embedded integrated industrial chromatograph measurement and control system - Google Patents
embedded integrated industrial chromatograph measurement and control system Download PDFInfo
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- CN1815219A CN1815219A CN 200610037974 CN200610037974A CN1815219A CN 1815219 A CN1815219 A CN 1815219A CN 200610037974 CN200610037974 CN 200610037974 CN 200610037974 A CN200610037974 A CN 200610037974A CN 1815219 A CN1815219 A CN 1815219A
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Abstract
An embedded integrated industrial chromatograph measurement and control system comprises a temperature detection and amplification circuit, a signal conditioning circuit, a PC104 module compatible with an ISA bus, wherein the PC104 module comprises a CPU, a memory, a bus circuit, an A/D, D/A conversion circuit, a network card, a display card, a keyboard interface, a clock, an I/O interface circuit, a URAT interface circuit of a high-speed universal asynchronous transceiver and an analog input/output port, the high-speed universal asynchronous transceiver is connected with an upper computer, the temperature detection and amplification circuit is connected with the A/D circuit and then connected with the analog input port on the PC104, the analog output port on the PC104 is connected with a connector through the D/A conversion circuit, temperature control and spectral peak identification are realized according to the calculation result of the PC104, and the analysis result is converted into a standard industrial analog signal of 4-20 mA. The invention improves the operability, maintainability and debugging convenience of the system. The misoperation possibly caused by two-place operation in the dual-machine mode is reduced.
Description
Technical field
The invention belongs to a kind of Measurement and analysis control system of measuring the intelligent online analytical instrument of component of mixture content, relate in particular to a kind of computer measurement and control system of industrial gas chromatograph.
Background technology
Industry such as oil, chemical industry, iron and steel are the lifeblood of a country.It not only plays supporting role to whole national economy, and the lifting of the military capability of the country of a country is all had significance.And industrial chromatograph is exactly a kind of large-scale process analysis instrument that is widely used in these industries.Industrial chromatograph is used for the composition and the content thereof of on-line analysis industrial processes gas, liquid flow process sample.Its analysis result is used for the direct quality testing of process computer control system.Because the industrial chromatograph applied location mostly is in the industrial production environment of high temperature, high pressure, severe toxicity.Therefore industrial chromatograph not only is related to production quality control, also is related to the safety of the person, equipment.
Industrial chromatograph is as the large-scale precision analytical instrument, reflected performance and the level of a country in process detecting instrument field.At present, all there are the series of products of oneself in developed countries such as the U.S., France, Japan, as the ABB of the U.S., and AA company, the Siemens Company of Germany, Japanese Yokogawa company etc.
China's starting aspect the development of industrial chromatograph and production is not late, and 1964 begin to produce.At the beginning of the eighties, analytical instrument factory in Nanjing has promptly produced the CX-2B industrial chromatograph, and the Ministry of Chemical Industry's Lanzhou Institute of Automation has also been produced HZ31 Series Industrial chromatograph.Since the reform and opening-up, by technology introduction, analytical instrument factory in Nanjing has adopted Beckman company technology, has produced CX-6710 and has had the CX6800 industrial chromatograph of microprocessor, and occupied certain market at home.But since the nineties, external industrial chromatograph intellectuality under the promotion of computing machine tide, when networking becomes trend, the chromatographic research of domestic industry and produce and but step into low tide.Pouring in of external high-performance instrument makes homemade industrial chromatograph almost lose whole market.Except the influence of overall situation such as policy factor, do not realize that the computerize of instrument makes major reason.Because DCS and field bus control system have proposed network service and intelligent, digitized requirement to industrial on-line analysis in the process control.And homemade analytical instrument obviously falls behind in this respect.At present, domestic have 20 surplus industrial chromatograph manufacturer of family, but major part is a low-end product.The high-performance analytical instrument particularly such large-scale instrument of industrial chromatograph is external dominance basically.
The commercial production and the numerous industrial chromatograph of the equal usage quantity of field of environment protection of present China.At oil, in the enterprises such as chemical industry, particularly in the large-scale process device of complete import, bought the external industrial chromatograph of larger amt, PGC as Siemens, the GC of Yokogawa etc., the high-performance analyzing and testing of its intellectuality, networking is the reliable quality target component that the DCS system of process control provides real-time online to have promoted the raising of control performance.But use for many years also shows its many deficiencies.The maintenance of first instrument and inconvenient maintenance.Because instrument production all abroad, the damage of parts and replacing rely on external manufacturer in the use.The expense expenditure that surpasses the maintenance of one year warranty and make house calls is huge, causes the working rate of import industrial chromatograph not high.Its two, industrial chromatograph is the high price scientific instrument, the function relative complex, the maintenance of its operation and maintenance is had relatively high expectations.And abroad this quasi-instrument all adopts foreign language interfaces such as English, and operation and use all are applicable to external user's use habit, and this makes troubles to the demestic user.And industrial chromatograph is that online long-time running is used, and is difficult to instrument is carried out more comprehensive operation practice and understanding at run duration, and grasp and technical training are owing to numerous factors such as cultural difference are difficult to accomplish comprehensively.This just causes instrument can not give full play to the problem of its performance etc. so-called " not acclimatized ".Its three, the high price of external instrument.Its middle-grade industrial chromatograph, the valency of buying of China is substantially about 400,000 Renminbi.High-performance industrial chromatograph unit price is about 800,000, and is even higher.This wherein has the value factor of large-scale precision instrument really, but the also undeniable composition that some " price discrimination " arranged.And its expense of making house calls is also relevant therewith with parts price height.Key be domestic do not have premium quality product of the same type to substitute or with it the competition.As described in CN03130858 ion chromatograph signals collecting and treating apparatus.
On the TT﹠C system structure, product has all adopted double machine structure at present basically both at home and abroad.Industry spot by with the incorporate embedded system of instrument, take on that operation control of instrument on-line operation and detector signal are handled, digitized processing, functions such as identification of current spectrum peak and component peaks calculating as a result, fault detect, the automatic demarcation of sample; And component parameter, spectrum peak identification parameter and intelligentized from adjust, time-event setting, program in BASIC editor, historical spectrogram shows and heavily identification handle and finish by external personal computer (being chromatographic work station).Its workflow is essentially: finish on external personal computer the online various parameter operating process down of industrial chromatograph, work such as spectrum peak identification parameter and analysis and processing method design, yet download in the embedded system of industrial chromatograph, press setup parameter and operating process by embedded system and carry out every work under online.Promptly common " the two-shipper mode " that claims.The sharpest edges of this structure are and can comparatively comprehensively compose peak identification and spectral data processing to the on-the-spot spectrogram under online by the Software System of Chromatogram Workstation on the PC, are to determine outcome parameter under operation.Siemens released MAXUM series in 2002, the new product that AA company releases all adopts said structure, the TT﹠C system that embeds instrument all adopts 32 bit function chips, with the industrial chromatograph of external PC by the transmission of RS232 or RS485 Serial Port Information, fully integratedization, its technological difficulties are the chromatographic work station technology is directly used in embedded system, will greatly increase the difficulty of system.
At present, there are 4,5 families in domestic industry chromatograph manufacturer.Aspect TT﹠C system: a kind of is to have adopted Dual OMU Servers Mode.Another kind of external PC is realized the operation and the spectrogram of instrument are handled by expansion board.Owing to consider requirement of explosion, industrial chromatograph uses is usually having the environment of hazardous gas, and double machine structure connects chromatograph and chromatographic work station by long line, and this uses obviously dangerous in inflammable and explosive industrial occasions, also be unfavorable for anti-interference.Simultaneously, because chromatographic work station is often not explosion-proof, need be away from being in the chromatograph that has in the hazardous gas environment.So double machine structure promptly is unfavorable for the debugging of equipment, also be unfavorable for operation.
From the TT﹠C system core processor, extensively adopt operation control, analysis and the signal Processing core devices of functional chip at present as industrial chromatograph.This series has good embedding characteristic, better performances such as antidetonation, anti-interference, heat radiation, and hardware cost is lower, in the TT﹠C system of single channel list detecting device industrial chromatograph more application is arranged.But raising along with the industrial chromatograph performance, the expansion of suitable application area, particularly for high performance twin furnace multi-detector industrial chromatograph, a large amount of chromatographic work station technology that adopt on analytical approach, data processing, the algorithm complexity that makes software system data calculating, when computing took a large amount of machine, the requirement of information storage simultaneously was also increasing, and this then seems unable to do what one wishes for this type of embedded system.And the HardwareUpgring difficulty is unfavorable for the seriation of product.
Summary of the invention
The objective of the invention is to: propose a kind of inlaid integrated industrial chromatograph detection-control system, solve existing double machine structure at explosion-proof security, anti-interference, the problem of aspects such as operability, overcome adopt single-chip microcomputer as the observing and controlling core component brought in product up-gradation, the difficulty in the design.Adopt built-in PC 104 bus modules to realize chromatographic control, analyze integratedly, make all, can both realize at the scene chromatographic operation and parameter setting, avoid since long line transmit the interference that may introduce; Simultaneously,, under the situation of needs, still can realize the two-shipper working forms, transmit spectrum peak number word signal to external PC because the present invention has designed the data output channel.Change the long-term dependence on import of China's high-performance industrial chromatograph present situation, make high performance twin furnace multi-detector industrial chromatograph of the present invention on analytical approach, data processing, satisfy the demand of domestic industry process and environmental protection, carry out the seriation design of HardwareUpgring and product easily.
The object of the invention also be by to the improvement of TT﹠C system under the condition that does not increase hardware resource, realize system's reorganization and the reconstruct of analytic system stream under the multiple analyze demands easily, the performance and the usable range of raising instrument.
Above-mentioned purpose of the present invention is achieved in that
Inlaid integrated industrial chromatograph detection-control system, it is characterized in that comprising temperature detection and amplifying circuit, adopt the PC104 module of isa bus compatibility, the PC104 module is by CPU, storer, bus circuit, A/D, the D/A change-over circuit, network interface card, video card, keyboard interface, clock, I/O interface circuit and High Speed General asynchronism transceiver (URAT) interface circuit, the analog input delivery outlet constitutes, connect host computer by High Speed General asynchronism transceiver (URAT), temperature detection is connected behind the A/D circuit and connects analog input mouth on the PC104 with amplifying circuit, simulation delivery outlet on the PC104 is by D/A change-over circuit out connector, realize temperature control and the identification of spectrum peak according to PC104 result of calculation, and analysis result is converted to the standard industry simulating signal of 4～20mA, the last integrated network interface card of PC104 also can be realized between instrument and the networking of instrument and DCS system.The I/O interface circuit is a digital quantity switching value I/O expansion module, and its output is controlled the chromatograph stream.The chromatographic detector signal is connected to A/D convertor circuit through signal conditioning circuit.
Improvement of the present invention is: system adopts the malleation electrical box of protective gas filling, adopts film instrument keyboard.Because this system works is in the environment that may have flammable explosive gas, holding circuit can realize whole chromatograph when work, and whole box body is in the environment greater than the protective gas of external atmospheric pressure all the time, thereby realizes requirement of explosion proof.Therefore this PC104 is the core component of total system.The PC104 embedded industrial control computer be a kind of compact conformation, low in energy consumption, reliability is high and all fully compatible with Standard PC bus computer PC 104 bus industrial computers on hardware and software.PC 104 modules are on form, volume extra small (90mm * 96mm * 15mm), (1-2W) low in energy consumption, need not heat radiation, can be stacked, can be used as small-sized working cell fully is embedded in the various device: on performance, adopt the chip and the components and parts of technical grade, be suitable for various bad working environment.
The PC 104 of embedded integrated chromatograph detection-control system is the mechanical electric standard of built-in PC, acted on the open bus-structured advantage of PC, construction standardization, highly compact, from stack formula modularization, have good anti-interference and heat dispersion, system upgrade is convenient, particularly software resource is abundant, have stronger constructing communication network function, realize that DCS and Fieldbus Control require easily.The electric signal that transmits by main control circuit by the conversion of the analog/digital amount on the PC104 after, calculate component concentration by CPU, and with the result by video card integrated on the PC104 integrated circuit board to large-screen lc display process result.PC104 also accepts the steering order and the parameter setting that are imported into by membrane keyboard.Control the opening and closing of valve on the chromatograph again by the digital quantity on the PC104 (switching value) delivery outlet, realize the control and the structural remodeling of flow path.Simulation delivery outlet on the PC104 is used for calculating the output spectrogram according to PC104, recognition result is converted to the standard industry trend signal of 4～20mA.PC104 also exports the signal of RS485 communication by the UART interface in addition.The last integrated network interface card of PC104 also can be realized the networking between instrument.
Because the advantage of having taked such scheme, the present invention compared with prior art to have is:
1, because the PC104 Industrial Control Computer has adopted the PC/AT structure the same with PC,, reduced dependence to hardware so software transplanting is convenient.Can use the software resource that enriches of PC, for the raising of chromatograph function provides condition.The PC104 intermodule connects by the PC104 bus in addition.In can stacked insertion PC104 bus slot, can realize the upgrading of system easily.For example can be the CPU module of high primary frequency and need not change other circuit of system as required with the CPU module upgrade that hangs down dominant frequency.
Therefore improve the upgradability of the software and hardware of system, prolonged the life cycle of system.And the growing with each passing hour of feasible system.
2, since all chromatographic operation is all carried out at scene, a place, thereby improved the operability of system, maintainability, debugging is convenient.Reduced because the maloperation that Dual OMU Servers Mode may cause owing to the operation of two places down.
3, adopt the strong PC104 Industrial Control Computer of antijamming capability, and cancelled long line transmission chromatographic signal, improved the whole interference free performance of system.
4, on the PC104 module a large amount of digital outputs are arranged, can realize stream control and structural remodeling easily.
5, realized a stationization to chromatographic control, analysis, operation.Dwindle the volume of total system, made things convenient for the installation of system.
6, have RS485, the output of standard industry MODBUS signal, the Ethernet network savvy can easily be networked with other instrument and equipments.
7, design the positive-pressure explosion-proof holding circuit, can guarantee the requirement of explosion proof of system.
8, owing to adopted incorporate design, make the cost of total system obtain reduction.
Description of drawings
Fig. 1 is the block diagram that system of the present invention constitutes
Fig. 2 is a signal conditioning circuit of the present invention
Fig. 3 is temperature detection of the present invention and amplifying circuit
Fig. 4 is power supply delay circuit figure of the present invention
Fig. 5 is heating source power supply delay circuit figure of the present invention
Fig. 6 is that standard model of the present invention is demarcated the mode restructuring graph automatically
Fig. 7 is the restructuring graph that chromatogram column analysis of the present invention loop is analyzed to multicolumn by multicolumn
Embodiment:
A specific embodiment of the present invention can realize like this.
One, the PC104 system realizes:
In order to realize the PC104 module among Fig. 1, the known PC104 integrated circuit board that can adopt following Sheng Bo company to produce.
1, the CPU module uses model to be: SysCentreModule/SuperDX CPU module (CPU be 486 or PII)
The CPU module has comprised dma controller, interruptable controller and the timer of all PC/AT compatibilities.The industrial ROM-BIOS of band expansion, the DROM of 16M byte and keyboard, horn interface; In the native system, there is not to adopt PC external connection keyboard commonly used.Because external PC keyboard is easily at the splicing interface place, the keyboard place produces faint spark, is unfavorable for explosion-proof.But adopt the membrane keyboard that pastes on the electric box that is full of positive pressure protection gas, thereby improve explosion-proof performance.This keyboard is connected on the CPU module keyboard interface.Thereby make PC104 can accept operational order and parameter setting.The external interface of plate comprises the bedirectional parallel port of a PC/AT compatibility, the RS-232 serial port of two 16550 compatibilities.The CPU module also provides a real time clock that the external backup battery of usefulness is supported.House dog based on real time clock can produce a non-shielding and interrupts by changing wire jumper, or produces a hardware reset when in system some fault taking place.This CPU module has unique EEPROM config memory, comes the parameter of saved system with it, has replaced the switch in the modular system, and it is bigger than the CMOS RAM in the General System, can preserve the more rich and varied parameter that is provided with.
2, the data acquisition module model is: DMM-16-AT
This plate mainly finish data acquisition, conversion of signals, the output of digital signal and simulating signal.This plate provides 16 tunnel unidirectional/8 tunnel differential analog quantity input, 16 bit resolutions, and maximum sample frequency is 100KHz, adopts FIFO (first-in first-out) high-speed sampling.The A/D signal is calibrated automatically.The simulation output of 4 road sign standards, 12 resolution.The digital quantity input of 8 tunnel TTL compatibles, the digital quantity output of 8 tunnel TTL compatibles.Counter/timer of 1 16 is used for counting and timing, and counter/timer of 1 32 is as the A/D timer clock.
In the present invention, insert the analog quantity input of this plate behind the electric signal process signal condition from chromatographic detector, realize chromatographic signal collection and A/D conversion.Offer the CPU module through the data bus in the signal process integrated circuit board of conversion and compose peak identification, and the result is exported to LCD by the system extension module.Perhaps on this integrated circuit board, realize the output of simulation trend, with the standard of being transformed to 4～20mA industry DCS signal.
Ben Ka also is responsible for gathering the temperature in the chromatograph machine in addition, realizes analyzing the collection of case, chromatogram furnace temperature.These temperature signals after the A/D of this card conversion according to control algolithm, through timer module, forms PMW by the CPU module, change the work period of solid-state relay, the control heating element through signal condition.Thereby industrial chromatograph is realized temperature control.
3, the data outputting module model is: RUBY-MM
The function of this plate mainly is to carry out simulating signal output, and this plate provides the simulation output of 8 tunnel 12 bit resolutions, to realize the temperature controlling function.
16 digit counters/timer and digital quantity input/output module model are: CDT2000, this is independently 16 digit counters/timers (8MHz OSC) of 3～12 of 48 passage digital quantity I/O expansion modules, based on four interrupt sources of programmable digital amount I/O of TTL/CMOS 71055 through combination, can produce one to four PC bus and interrupt, this plate provides the UART change-over circuit of RS-422 and RS-232CC serial communication interface; This plate function mainly provides bus and interrupts the digital quantity I/O.This plate provides 3 or 6 or 9 or 12 independently 16, counter/timer of 8MHz.
This plate is mainly used in the opening and closing of control electromagnetic valve in the present invention, thereby realizes the control of stream.Provide the RS-485DCS conversion of signals in addition, the function of interrupt control.
4, system extension module model is: SEM/VPFIE
It provides 4 interfaces for the PC104 system: high resolution display interface, floppy disk, IDE hard disk drive, network interface.Power management has a SNOOZE utility software, if not operation in pre-set time interval, this software with sleep mode will be closed display, to reduce power supply power consumption.
In the present invention, LCD just inserts the display interface device of this integrated circuit board, thereby realizes friendly man-machine interface together with membrane keyboard.System adopts the mode of the electronics solid-state disk of straight cutting 388MB on the IDE hard disk drive interface that the storage of storage space and the system journal and the historical spectrum peak recognition data of operating system is provided for system.Network interface card then is the networking and the Long-distance Control of machinery and equipment, and diagnosis provides condition.
Two, signal conditioning circuit
Signal conditioning circuit can be realized as Fig. 2 circuit.
Because it is usually very faint to detect signal from chromatographic detector, can be the signal that PC104D/A accepted so this signal need be amplified to.This partial circuit principle is with reference to Fig. 2, and principle is as follows: the chromatographic detector signal is through A, and 2 of B insert signal conditioning circuit.R4 among Fig. 2, C401, C402 have constituted the π low-pass filter, disturb with filtering noise.Be the elementary amplification of signal herein for operational amplifier, LF444 used in the influence of signal source drive current (homemade model is: CF444), LF444 is a high input impedance, low noise, the operational amplifier that input current is little in order to reduce.That is to say that elementary amplifying circuit has amplified because the voltage difference that the electric bridge imbalance is caused.Secondary circuit adopts voltage follower to improve the ability that drives load further by the high frequency interference (3000Hz) of 6 times of work frequencies of a π low pass filter filters out simultaneously.Two diodes of back are used for amplitude limit, prevent that excessive output signal from damaging the AD converter part of back.RP402 is used to adjust the voltage of 2 grades of amplifying circuits, so that further adjust the voltage amplitude of output.
Amplifying circuit has amplified because the voltage difference that the electric bridge imbalance is caused.Secondary circuit adopts voltage follower to improve the ability that drives load further by the high frequency interference (3000Hz) of 6 times of work frequencies of a π low pass filter filters out simultaneously.Two diodes of back are used for amplitude limit, prevent that excessive output signal from damaging the AD converter part of back.RP402 is used to adjust the voltage of 2 grades of amplifying circuits, so that further adjust the voltage amplitude of output.
Two, temperature detection and amplifying circuit temperature detection and amplifying circuit
To the wide region of analytical column case and sensors work environment, high stable, high-precision temperature controlled quentity controlled variable is to guarantee the reliable essential condition of accurately analyzing of industrial chromatograph.The present invention has made particular design to temperature detection and amplifying circuit for this reason.
Temperature detection and amplifying circuit as shown in Figure 3, temperature element adopts the Pt1000 platinum resistance.Its measure portion is not steady electric bridge, platinum resistance R
tDecide resistance R with solid-state
1, R
2, R
3Form jiggly four brachium pontis.U is its power supply.For the precision that guarantees to measure, adopt twice voltage stabilizing.When temperature is 0 ℃, the resistance R of platinum resistance
t=R
0=R
1=1000 Ω, electric bridge is steady, and 2 of diagonal line A, B do not have voltage difference; When temperature variation, the resistance of platinum resistance becomes Rt, 1 ℃ of every increase, platinum resistance be changed to 0.385 Ω, its changing value is directly proportional with temperature.This moment, electric bridge was not steady, and 2 of diagonal line A, B have voltage difference, and this voltage difference is delivered to the input end of operational amplifier, delivered to the A/D conversion chip after amplifying.
Change W
1, W
2Numerical value, can obtain different amplification coefficients.Wherein, amplifier adopts LM741CN, and LM741CN is a monolithic high-performance internally-compensated operational amplifier, the sealing of 8 pin dual inline types.Common-mode voltage range with broad in use latch phenomenon can not occur, can be used as integrator, summing amplifier and common feedback amplifier.Be characterized in: do not need the foreign frequency compensation; Has short-circuit protection; The ability of offset voltage set to zero; The common mode of broad and differential mode voltage scope; Low in energy consumption; Non-obstruction phenomenon.Between amplifier output and observed temperature is nonlinear relationship, and its gamma correction is finished by the PC104 system.
Because the operate as normal of chromatographic different parts has specific (special) requirements to temperature, so, designed temperature detection and amplifying circuit herein in order effectively to control temperature.The heating of temperature realizes by heating wire.
Three, holding circuit part
Because total system is installed in the electric box that is full of malleation, thereby prevents that hazardous gas from entering electric box.Because blanket gas hypotony and initiation potential in the electric box that causes of a variety of causes, according to requirement of explosion proof, the electric energising of starting to write starts and must can start through being no less than after the minimum ventilation volume ventilation of the blanket gas purging in order to prevent.If blanket gas pressure is reduced to suddenly when requiring in the electric box when chromatograph is worked, also can cut off total supply voltage of system.So designed power supply delay circuit and heating source power supply delay circuit.
1, power supply delay circuit (mode realizes as shown in Figure 4)
The total power supply of this circuit realization electric box only could connected when blanket gas pressure is higher than ambient pressure 50Pa in the electric appliance box.This circuit theory is as follows:
By JP, E (battery), R1, R2, U1, D1, D2, D3 forms charging circuit, forms delay circuit by N1, R1, C1, C2, and ultra low pressure switch S 1 is as the measuring sensor of electric box pressure sensor.After additional power source was connected, when the malleation value was greater than 50Pa in the electric box, S1 was in conducting state, on the E, had been full of electric charge in this circuit.And VCC does not power up, and does not have voltage.This moment, U1b was a low-voltage, and U1ce is in conducting state.Battery powers up to the delay circuit of being made up of C1, R1, N1 by JP, U1, S1, and delay circuit was delayed time to the stipulated time, and the N1 output terminal presents high level and delivers to topworks, and the time-delay of finishing power supply powers up.At this moment, VCC gets electric, through D1, D2, R1, JP E is charged respectively, makes U1b present high level through D1, D2, R2, allows U1ec end.When malleation in outage of, additional power source or the electric box is lower than atmospheric pressure and adds 50Pa, this circuit will re-execute once.
2, analyze case heating source power supply delay circuit (realizing) as Fig. 5 mode
Among Fig. 5, R1, R2, R3, N1, ultra low pressure switch S 1 are formed comparator circuit; R4, U1 forms electronic switch; C1, R5, C2, N2 form delay circuit.
In analyzing case malleation value when being lower than 50Pa, S1 disconnects, N1 output is noble potential, drives photoelectrical coupler, makes the N2 output at electronegative potential, and makes heating source stop heating by topworks.When malleation in the case during greater than ambient pressure 50Pa, S1 connects, and N1 is electronegative potential, by C1, R5, C2, N2 form the delay circuit trigger to the stipulated time, N2 output is noble potential, and makes heating source begin heating by topworks.
Four, structural remodeling
Owing to have abundant switch outbound port to use on the PC104, so the present invention can realize the reconstruct of analysis stream line structure easily.Its control is finished through light-coupled isolation, driving by the switching value output of PC104 system.The user can pass through man-machine interface, and the version that meets its requirement is set voluntarily.
1, standard model is demarcated mode reconstruct automatically
For process analytical instrument, must regularly calibrate, to guarantee precision to instrument.Its method is generally the standard sample gas that feeds certain composition to system, comes calibrating instrument with it.In industry spot,, must influence the instrument service efficiency, and may cause unnecessary loss if each the demarcation all needs the manual stream that changes.Simultaneously in order to make a chromatograph can detect several sample pneumatolytic parts on the different streams, can realize that standard model demarcates mode reconstruct automatically by Fig. 6 mode.
Be provided with 1-3 road standard sample gas calibration system and automatic switchover valve, 1-5 passes by journey sample gas automatic switchover valve.When process sample gas 1 was analyzed, Open valve 1 was closed other valves.Analytic process sample gas 2 if desired, then Open valve 2, close other valves.Thereby realize many streams of a chromatograph analysis.Owing to chromatographic demarcation, usually need the standard sample gas of different components.So in Fig. 6, use standard sample gas 1 to come calibration system if desired, just open valve 3, close other valves.Use standard sample gas 2 to come calibration system if desired, just open valve 4, close other valves.Thereby, realize the selection of standard sample gas and demarcation successively in the situation that need not manually change stream.
2, the chromatogram column analysis loop is by the reconstruct of single-column to the multicolumn analysis
Generally speaking, a kind of chromatographic column only has good chromatographic resolution effect to the sample of certain composition.And actual sample composition may be very complicated, and this just need combine different types of chromatographic column, as tandem compound, realizes the reconstruct that single chromatographic column is analyzed to the polychromatic spectrum post.It can be by realization shown in Figure 7.
Quantity of sample is iff just can effectively realizing chromatographic resolution by chromatographic column 1.Then can an Open valve 1, and close other valves.If sample composition complexity only uses chromatographic column 1 can not realize effective separation.Then can valve-off 1, Open valve 2, thus 3 sample is separated again after separating through chromatographic column 1 through chromatographic column 2.Thereby realize the multicolumn separation chromatography.
The electrical box of the malleation of protective gas filling, protective gas can adopt gases such as argon, nitrogen, carbon dioxide.The sealing of film instrument keyboard is arranged on the casing.
Claims (7)
1, inlaid integrated industrial chromatograph detection-control system, it is characterized in that comprising temperature detection and amplifying circuit, signal conditioning circuit, adopt the PC104 module of isa bus compatibility, the PC104 module is by CPU, storer, bus circuit, A/D, the D/A change-over circuit, network interface card, video card, keyboard interface, clock, I/O interface circuit and High Speed General asynchronism transceiver URAT interface circuit, the analog input delivery outlet constitutes, connect host computer by the High Speed General asynchronism transceiver, temperature detection is connected behind the A/D circuit and connects analog input mouth on the PC104 with amplifying circuit, simulation delivery outlet on the PC104 is by D/A change-over circuit out connector, realize temperature control and the identification of spectrum peak according to PC104 result of calculation, and analysis result is converted to the standard industry simulating signal of 4～20mA, the last integrated network interface card of PC104 also can be realized between instrument and the networking of instrument and DCS system; The I/O interface circuit is a digital quantity switching value I/O expansion module, and its output is controlled the chromatograph stream, and the chromatographic detector signal is connected to A/D convertor circuit through signal conditioning circuit.
2,, it is characterized in that system adopts the malleation electrical box of protective gas filling, and be provided with film instrument keyboard by the described inlaid integrated industrial chromatograph detection-control system of claim 1.
3,, it is characterized in that temperature detection and amplifying circuit metering circuit are not steady electric bridge, by temperature sensitive platinum resistance R by the described inlaid integrated industrial chromatograph detection-control system of claim 1
fDecide resistance R with solid-state
1, R
2, R
3Form jiggly four brachium pontis; Electric bridge diagonal line point has voltage difference, and the concatenation operation amplifier input terminal is delivered to the A/D conversion chip after amplifying.
4,, it is characterized in that being full of in the electric box of malleation and be provided with the measuring sensor of ultra low pressure switch (S1) as the electric box pressure sensor by the described inlaid integrated industrial chromatograph detection-control system of claim 1.
5,, it is characterized in that adopting standard model to demarcate mode automatically and also can adopt reconstructing method that instrument is carried out timing alignment, to guarantee precision by the described inlaid integrated industrial chromatograph detection-control system of claim 1.
6,, it is characterized in that being provided with 1-3 standard sample gas calibration system and switch valve, 1-5 passes by journey sample autogenous cutting and changes valve by the described inlaid integrated industrial chromatograph detection-control system of claim 1.
7,, it is characterized in that being provided with chromatographic column tandem compound valve by the described inlaid integrated industrial chromatograph detection-control system of claim 1.
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