CN207036665U - A kind of gas detecting system - Google Patents
A kind of gas detecting system Download PDFInfo
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- CN207036665U CN207036665U CN201720947394.0U CN201720947394U CN207036665U CN 207036665 U CN207036665 U CN 207036665U CN 201720947394 U CN201720947394 U CN 201720947394U CN 207036665 U CN207036665 U CN 207036665U
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- gas
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Abstract
The utility model discloses a kind of gas detecting system, including：Signal input unit, its input are connected with the output end of gas reaction chamber detector and/or pressure current template, gather the output signal of gas reaction chamber detector and/or pressure current template；Processor unit, there is the FPGA portion of MCU parts and/or extension, signal input unit is connected with MCU by ADC interface and/or SPI interface, the signal after collection is analyzed, and output signal controls the break-make and Flow-rate adjustment of gas circuit；Comparing unit, the output end of FPGA portion are connected by DAC with comparator, the detector voltage of input are compared by comparator, and be back to FPGA portion；Output unit, the output end of the MCU parts are connected with display module.The purpose of this utility model is to provide a kind of gas detecting system that multiple gases detection analysis instrument is integrated in one, and the system cost is low, gathers signal stabilization.
Description
Technical field
It the utility model is related to gas measurement technique field, and in particular to a kind of gas detecting system.
Background technology
Dusty gas includes in air at present, nitrogen dioxide, sulfur dioxide, carbon monoxide and ozone etc., its concentration monitor
Device is independent gas monitoring instrument, and measurement gas concentration needs to be used alone, it is impossible to the needs of meeting while monitoring；And each gas
The measurement apparatus of body monitoring device is unreasonable so that measurement data is not accurate enough due to its structure design.
Under test gas is first pumped into instrument in monitoring, makes itself and Cucumber by automonitor by sampling pipe
Chemically reacted, or measured with ultraviolet light or using UV absorption principle, such as the work of nitrogen dioxide analyzer
When, nitrogen dioxide is first converted into nitric oxide, then allow nitric oxide and excessive ozone reaction, produce the titanium dioxide of excitation state
Nitrogen, the nitrogen dioxide of the excitation state is very unstable, returns to transition ground state, and launch wavelength scope is 600~3000nm light, root
According to transmitting light intensity to determine nitric oxide production concentration, content of nitrogen dioxide is finally extrapolated by nitric oxide concentration.Ozone point
Analyzer utilizes ultraviolet absorption method, will be passed through absorption cell first, then irradiates, contrasts by UV absorption and not ultraviolet with ultraviolet
The light of absorption, the concentration of ozone in can analyzing.Sulfur dioxide is to use ultraviolet fluorescence method, and instrument is typically by sample cell, ultraviolet
Light source, detector are formed, and during monitoring, sulfur dioxide is passed through sample cell, then with 190~300nm of wavelength ultraviolet light, two
Excitation state is transitted to after sulfur oxide molecule absorption ultraviolet light, when the sulfur dioxide molecule in excitation state returns to ground state, is launched
In addition fluorescence of the peak wavelength near 330nm, the fluorescence intensity and sulfur dioxide concentration are linear, and then extrapolate again
Sulfur dioxide concentration.Above instrument can only measure a kind of pollutant, and the workload of instrument maintenance is big.Detected based on above-mentioned gas
Instrument is separately provided, and corresponding circuit communication device is independently arranged, and cost accordingly increases.
Utility model content
Therefore, the purpose of this utility model is to provide a kind of gas inspection that multiple gases detection analysis instrument is integrated in one
Examining system, the system cost is low, gathers signal stabilization.
A kind of gas detecting system provided by the utility model, including：
Signal input unit, its input are connected with the output end of gas reaction chamber detector and/or pressure current template, adopted
Collect the output signal of gas reaction chamber detector and/or pressure current template；
Processor unit, have MCU part and/or extension FPGA portion, signal input unit by ADC interface and/
Or SPI interface is connected with MCU, the signal after collection is analyzed, output signal controls the break-make and Flow-rate adjustment of gas circuit；
Comparing unit, the output end of FPGA portion are connected by DAC with comparator, the detector by comparator to input
Voltage is compared, and is back to FPGA portion；
Output unit, the output end of the MCU parts are connected with display module.
Alternatively, in addition to pressure current template, its output end are connected by GPIO interface with MCU, control the break-make of gas circuit.
Alternatively, in addition to temperature detection plate, its output end are connected by GPIO interface with MCU.
Alternatively, MCU part connects new school machine expansion board by UART, further through DAC interface output signals to than
Example valve controling circuit.
Alternatively, the FPGA portion realizes two-way communication with MCU parts by FSMC external memory interfaces.
Alternatively, the MCU parts are provided with network interface.
Technical solutions of the utility model, have the following advantages that：
Gas detecting system of the present utility model, while it is dense to measure carbon monoxide, ozone, sulfur dioxide and nitrogen oxides
Degree, is improved by rational air-channel system, the analyzer of above-mentioned four kinds of gases is integrated in a portable 3U rack, respectively
By carbon monoxide and ozone, sulfur dioxide is divided into two gas circuits with nitrogen oxides, can not only realize multiple gases single injected sampling
Detection just is automatically completed simultaneously, meanwhile, signal input and processing time, the response signal for shortening gas are stable.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is schematic block circuit diagram of the present utility model；
Fig. 2 is the utility model structure overall structure diagram；
Fig. 3 is the first air-channel system schematic block circuit diagram；
Fig. 4 is the second air-channel system schematic block circuit diagram.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Conflict can is not formed to be combined with each other.
Embodiment 1
A kind of Portable integrated gas content detecting system of the present embodiment, it is shown in Figure 2, including ozone analysis group
Part, carbon monoxide analytic unit, sulfur dioxide analytic unit and analysis of nitrogen oxide component, ozone analytic unit and carbon monoxide
Analytic unit is set to the first air-channel system, and sulfur dioxide analytic unit and analysis of nitrogen oxide component are set to the second air-channel system.
Specifically, system entrance controls calibration gas by a three-way magnetic valve or treats the input of test sample gas, works as calibration
Gas or after test sample gas enters air-channel system, is divided into two gas circuits, the first air-channel system includes successively setting along airflow direction
Carbon monoxide analytic unit and ozone analytic unit, flowmeter and proportioning valve are located between ozone analytic unit and the pump housing, smelly
Oxygen analytic unit controls the branch road of ozone eliminating machine by washing by a three-way magnetic valve and is not provided with the gas circuit of the branch road of ozone eliminating machine by washing
Break-make, the second air-channel system include the sulfur dioxide analytic unit and analysis of nitrogen oxide component successively set along airflow direction,
Flowmeter and proportioning valve are located between sulfur dioxide analytic unit and analysis of nitrogen oxide component, the inspection of analysis of nitrogen oxide component
Surveying needs to carry out under condition of negative pressure caused by the pump housing.
Referring to shown in Fig. 1, Fig. 3 and Fig. 4, signal input unit, its input and gas reaction chamber detector and/or pressure
The output end connection of current plate, gather the output signal of gas reaction chamber detector and/or pressure current template；Processor unit,
FPGA portion with MCU parts and/or extension, signal input unit are connected by ADC interface and/or SPI interface with MCU,
Signal after collection is analyzed, output signal controls the break-make and Flow-rate adjustment of gas circuit；Comparing unit, FPGA portion it is defeated
Go out end to be connected with comparator by DAC, the detector voltage of input is compared by comparator, and be back to FPGA portions
Point；Output unit, the output end of the MCU parts are connected with display module.
The present embodiment is connected by two circuit boards by UART serial ports, one of circuit board control carbon monoxide and smelly
Gas circuit where oxygen, gas circuit where another circuit board control sulfur dioxide and nitrogen oxides.
Ozone sounding part be wavelength for Detection wavelength 254nm ultraviolet signal, therefore from BHK middle cardiac wave
Long 254nm 80-1025-01 uviol lamp, light intensity 27uw/ square centimeters, its power supply are the mercury lamp power supply specially designed
Plate, this mercury lamp power panel input voltage 24V, using BHK power modules 68-0020-04, (12V is inputted, and output current 20mA is defeated
It is 1100V to go out voltage) output fixed voltage, from the R1228 sensors in the preferable shore pine of corresponding wave band response ratio, using just
Negative 15V power supplies, the detection signal of sensor is sent into AD circuits after amplifier amplifies and changed, then by the numeral after conversion
Signal delivers to MCU and carries out data analysis and process；Carbon monoxide detecting part, HELIOWORKS EK- is used as needed
5372 light sources, crest voltage 1.4V, electric current 1.8A, to be powered by CO correlations wheel plate for it, detector is powered using positive and negative 15V,
The sensor that 90-100V voltages are shore pine P9696-202 is produced first with square wave generation circuit and voltage doubling rectifing circuit to power,
The detection signal of sensor is sent into AD circuits after amplifier amplifies and changed, and then delivers to the data signal after conversion
MCU carries out data analysis and process；Gas circuit control section, using the connection and cut-off of transistor controls 24V power supplys to sample gas and
Gas is selected；Pressure and flow sensor measure pressure in gas circuit respectively and flow signal feeds back to processor, because of CO
And O3Gas circuit all the way is shared, and uninterrupted needed for two kinds of gases of measurement is essentially identical, so connecting pressure in the end of this gas circuit
Power flow sensor plate, the pressure and flow of gas circuit are monitored in real time, three at system entrance and ozone analytic unit
Three-way electromagnetic valve is connected by GPIO interface with MCU.
Sulfur dioxide probe portion, SO2Detection, it is necessary to wavelength 214nm ultraviolet light, therefore is selected using ultraviolet fluorescence method
BHK centre wavelengths 213.9nm 89-9020-01 uviol lamp, rated operational voltage 160V, rated current 47.5mA, electricity
Source exports highest starting voltage using east literary zinc lamp high-voltage power module DW-P501-2C68, input voltage AC220V：
AC2000VPP, output voltage representative value are AC160V, and lamp current 35mA~55mA is adjustable, SO2Detector uses H10682-
210, the count sensitivity at supply voltage 5V, 300nm is 3.9x105/ (s*pW), dark counting 50/s, cross light energy detection
Output positive level is more than 3.5V, and negative level is less than 0.5V, and output signal uses 50 Ω impedance matchings, and obtained signal amplitude is
2.2V, compared with the analog level of the DAC chip output on mainboard, photoelectron counting number is obtained, deliver to FPGA processing and divide
Analysis.Whether mainboard controls the irradiation of zinc lamp by controlling the break-make of electromagnet, and the number of dark counting is detected with this；Nitrogen oxidation
Thing probe portion, probe portion use H10682-01, and the count sensitivity at supply voltage 5V, 600nm is 2.0x105/
(s*pW), dark counting 600/s, cross light energy detection output positive level and be more than 3.5V, negative level is less than 0.5V, and output signal uses
50 Ω impedance matchings, obtained signal amplitude are 2.2V, compared with the analog level of the DAC chip output on mainboard, obtain light
Electronic counting number, deliver to FPGA processing.Mainboard detects of dark counting by controlling the electromagnetic valve switch of ozone generator
Number.Gas circuit control section, SO2And NOXAlthough gas circuit all the way is shared, because NOXNegative pressure is needed to work, so in NOXReative cell it
Preceding pressure current template measurement SO2The flow and pressure of gas, the pressure and flow of gas circuit are monitored in real time, NOXDirectly use
Pumping works into negative pressure, in NOXFlow is controlled by metering hole before reative cell.The flow fed back according to pressure flow circuit board
Signal magnitude, which automatically controls proportioning valve, makes whole gas circuit maintain a constant flow substantially, and proportioning valve uses CLIPPARD companies
EV-P-10-2525, supply voltage 10V, aperture 0.025inch, maximum pressure 25psig.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (6)
- A kind of 1. gas detecting system, it is characterised in that including：Signal input unit, its input are connected with the output end of gas reaction chamber detector and/or pressure current template, gather gas The output signal of precursor reactant room detector and/or pressure current template；Processor unit, has the FPGA portion of MCU parts and/or extension, and signal input unit passes through ADC interface and/or SPI Interface is connected with MCU, and the signal after collection is analyzed, and output signal controls the break-make and Flow-rate adjustment of gas circuit；Comparing unit, the output end of FPGA portion are connected by DAC with comparator, the detector voltage by comparator to input It is compared, and is back to FPGA portion；Output unit, the output end of the MCU parts are connected with display module.
- 2. gas detecting system according to claim 1, it is characterised in that also lead to including pressure current template, its output end Cross GPIO interface to be connected with MCU, control the break-make of gas circuit.
- 3. gas detecting system according to claim 1, it is characterised in that also lead to including temperature detection plate, its output end GPIO interface is crossed to be connected with MCU.
- 4. gas detecting system according to claim 1 or 2, it is characterised in that the MCU parts are new by UART connections School machine expansion board, further through DAC interface output signals to Proportion valve controlling circuit.
- 5. gas detecting system according to claim 3, it is characterised in that the FPGA portion passes through with MCU parts FSMC external memory interfaces realize two-way communication.
- 6. gas detecting system according to claim 3, it is characterised in that the MCU parts are provided with network interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720947394.0U CN207036665U (en) | 2017-08-01 | 2017-08-01 | A kind of gas detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720947394.0U CN207036665U (en) | 2017-08-01 | 2017-08-01 | A kind of gas detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207036665U true CN207036665U (en) | 2018-02-23 |
Family
ID=61461958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720947394.0U Expired - Fee Related CN207036665U (en) | 2017-08-01 | 2017-08-01 | A kind of gas detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207036665U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168771A (en) * | 2018-02-28 | 2018-06-15 | 广西玉柴机器股份有限公司 | Nitrogen oxygen analyzer supervises pressure device |
| CN112906875A (en) * | 2021-04-29 | 2021-06-04 | 常州高凯电子有限公司 | Control system and method for precise gas flow valve |
-
2017
- 2017-08-01 CN CN201720947394.0U patent/CN207036665U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168771A (en) * | 2018-02-28 | 2018-06-15 | 广西玉柴机器股份有限公司 | Nitrogen oxygen analyzer supervises pressure device |
| CN108168771B (en) * | 2018-02-28 | 2023-12-19 | 广西玉柴机器股份有限公司 | Pressure monitoring device of nitrogen-oxygen analyzer |
| CN112906875A (en) * | 2021-04-29 | 2021-06-04 | 常州高凯电子有限公司 | Control system and method for precise gas flow valve |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 |