CN208140628U - A kind of novel gaseous state pollutant concentration electrochemical sensor - Google Patents
A kind of novel gaseous state pollutant concentration electrochemical sensor Download PDFInfo
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- CN208140628U CN208140628U CN201820760087.6U CN201820760087U CN208140628U CN 208140628 U CN208140628 U CN 208140628U CN 201820760087 U CN201820760087 U CN 201820760087U CN 208140628 U CN208140628 U CN 208140628U
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Abstract
The utility model relates to a kind of novel gaseous state pollutant concentration electrochemical sensors,The sensor includes protection installation shell (1),Electrochemistry sensing element (2),Signal amplification circuit plate (3),Main control board (4) and interface card (5),Electrochemistry sensing element (2),Signal amplification circuit plate (3),Main control board (4) and interface card (5) are sequentially arranged at the inside of protection installation shell (1),The utility model structure is simple and novel,Overall volume small and exquisite exquisiteness,It can access the sensing element of different electrochemical reaction types,Parameter acquisition suitable for a variety of gaseous pollutant characteristic indexs,Measurement error caused by can offsetting because of environmental change,It is high to monitor accuracy,Overall operation stability is good,Pin is selected with function,Make using more flexible,Equipped with Temperature Humidity Sensor,Keep factory calibration and periodic calibration more convenient.
Description
Technical field
The utility model relates to air detection technical fields, and in particular to a kind of novel gaseous state pollutant concentration electrochemistry biography
Sensor.
Background technique
With the quickening of industrialization development process, cause under area source and the collective effect of local pollution sources certain
There is composite air pollution in area, and urbanization acceleration causes vehicles number persistently to keep rising with transport need rapid growth
Trend, tail gas pollution of motor-driven vehicle are more serious.China issues at the beginning of 2012《(the examination of ambient air quality Index A QI technical stipulation
Row)》In, scientific definition describes the zero dimension index AQI of Air Quality, i.e. air quality index (Air Quality
Index), air pollutants monitoring item is 6：PM2.5, PM10, carbon monoxide, sulfur dioxide, nitrogen dioxide and ground level ozone.
2016, new《Ambient air quality》(GB3095-2012) it is implemented in full in China, particle is more highlighted in standard
Object concentration (PM2.5, PM10) and gaseous state pollutant concentration (carbon monoxide, sulfur dioxide, nitrogen dioxide and ozone) are as meter
Calculate the important parameter of air quality index.
In actual air quality monitoring, the measuring method of gaseous pollutant concentration is mostly absorption spectrometry,
The advantage that this measuring method has detection accuracy high, still, opening in the point type sampling apparatus that this measuring method is relied on
It puts formula light path analysis instrument and calibrator (-ter) unit is expensive, lay mode complexity, be not suitable for a wide range of, high density point cloth
If.With the General Office of the State Council《About the notice for reinforcing environment supervision law enforcement》Promulgation, various regions government gone on grid one after another
The road for changing air quality monitoring and improvement, by science intensively layout and trend analysis, effectively improve air monitoring
And the working efficiency administered.In gridding air-quality monitoring system, electrochemical sensor is because it is with small in size, measurement essence
The features such as degree is high, production cost is relatively low, has been quickly become in gridding air pollution surveillance system and has measured gaseous pollutant
The first choice of sensor.Existing electrochemical sensor is two electric pole types, and it is lower to there is Measurement Resolution in actual use, monitoring
The poor disadvantage of accuracy
Summary of the invention
Utility model aims to solve the shortcomings of the prior art, provide a kind of novel gaseous state pollutant concentration
Electrochemical sensor, structure is simple and novel, overall volume small and exquisite exquisiteness, can access the sensitivity member of different electrochemical reaction types
Part, suitable for the parameter acquisition of a variety of gaseous pollutant characteristic indexs, measurement error caused by can offsetting because of environmental change, monitoring
Accuracy is high, and overall operation stability is good, and there is function to select pin, makes to be equipped with Temperature Humidity Sensor, make using more flexible
Factory calibration and periodic calibration are more convenient.
The technical solution adopted in the utility model is：A kind of novel gaseous state pollutant concentration electrochemical sensor, including it is anti-
Shield installation shell 1, electrochemistry sensing element 2, signal amplification circuit plate 3, main control board 4 and interface card 5, electrochemistry is quick
Sensing unit 2, signal amplification circuit plate 3, main control board 4 and interface card 5 are sequentially arranged at the interior of protection installation shell 1
Portion, the shape of protection installation shell 1 are in cylindrical shape, including upper housing 11 and lower case 12, the intermediate setting of upper housing 11
There is upper installation cavity 13, the top of upper housing 11 is provided with fan inlet 14, and fan inlet 14 is connected to upper installation cavity 13, leads to
The internal diameter of wind air inlet 14 be less than upper installation cavity 13 internal diameter, between have upper positioning plane 15, upper positioning plane
Metal protection filter screen 16 is provided on 15, the centre of lower case 12 is provided with lower installation cavity 17, the bottom end setting of lower case 12
There is installation via hole 18, installation via hole 18 is connected to lower installation cavity 17, and the internal diameter of installation via hole 18 is less than lower installation cavity 17
Internal diameter, between have a lower positioning plane 19, upper housing 11 and lower case 12 are threadedly coupled, upper installation cavity 13 and lower installation cavity
17 are connected, and the top of electrochemistry sensing element 2 is provided with sealing ring 21, and bottom is provided with working electrode contact pin 22, to electricity
Pole contact pin 23, reference electrode contact pin 24 and auxiliary electrode contact pin 25 are provided with one stage signal amplification electricity on signal amplification circuit plate 3
Road 31, second signal amplifying circuit 32 and four electrode jacks 33, be provided on main control board 4 analog-digital converter 41,
Low pressure difference linear voltage regulator 42, single-chip microcontroller 43 and Temperature Humidity Sensor 44 are provided with positive pole pin on interface card 5
51, power cathode pin 52, data receiver pin 53, data send pin 54, direction controlling pin 55, function and select pin 56
With reserved pin 57, main control board 4 is arranged between signal amplification circuit plate 3 and interface card 5, signal amplification circuit plate
Power pin 6 and analog signal contact pin 7 are provided between 3 and main control board 4, between main control board 4 and interface card 5
It is provided with power pin 6 and digital signal pin 8, sealing ring 21 is in contact with metal protection filter screen 16, working electrode contact pin
22, electrode contact pin 23, reference electrode contact pin 24 and auxiliary electrode contact pin 25 are respectively inserted into four electrode jacks 33, interface
Circuit board 5 is in contact with lower positioning plane 19, positive pole pin 51, power cathode pin 52, data receiver pin 53, data
It sends pin 54, direction controlling pin 55, function selection pin 56 and reserved pin 57 and extends to lower casing across installation via hole 18
Outside body 12.
The utility model has the advantages that compared with prior art：Structure is simple and novel, the small and exquisite essence of overall volume
It causes, can access the sensing element of different electrochemical reaction types, suitable for the parameter acquisition of a variety of gaseous pollutant characteristic indexs,
Measurement error caused by can offsetting because of environmental change, monitoring accuracy is high, and overall operation stability is good, and there is function selection to draw
Foot makes to be equipped with Temperature Humidity Sensor, keep factory calibration and periodic calibration more convenient using more flexible.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model,
Fig. 2 is the structural schematic diagram of protection installation shell in the utility model,
Fig. 3 is the structural schematic diagram of electrochemistry sensing element in the utility model,
Fig. 4 is the structural schematic diagram of signal amplification circuit plate in the utility model,
Fig. 5 is the structural schematic diagram of main control board in the utility model,
Fig. 6 is the structural schematic diagram of interface card in the utility model.
Specific embodiment
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a kind of novel gaseous state pollutant concentration electrochemical sensor, packet
Include protection installation shell 1, electrochemistry sensing element 2, signal amplification circuit plate 3, main control board 4 and interface card 5, electrification
It learns sensing element 2, signal amplification circuit plate 3, main control board 4 and interface card 5 and is sequentially arranged at protection installation shell 1
The shape of inside, protection installation shell 1 is in cylindrical shape, including upper housing 11 and lower case 12, the centre of upper housing 11 are set
It is equipped with installation cavity 13, the top of upper housing 11 is provided with fan inlet 14, and fan inlet 14 is connected to upper installation cavity 13,
The internal diameter of fan inlet 14 is less than the internal diameter of upper installation cavity 13, between have a upper positioning plane 15, upper positioning is put down
Metal protection filter screen 16 is provided on face 15, the centre of lower case 12 is provided with lower installation cavity 17, and the bottom end of lower case 12 is set
It is equipped with installation via hole 18, installation via hole 18 is connected to lower installation cavity 17, and the internal diameter of installation via hole 18 is less than lower installation cavity 17
Internal diameter, between have a lower positioning plane 19, upper housing 11 and lower case 12 are threadedly coupled, upper installation cavity 13 and lower installation
Chamber 17 is connected, and the top of electrochemistry sensing element 2 is provided with sealing ring 21, and bottom is provided with working electrode contact pin 22, right
Electrode contact pin 23, reference electrode contact pin 24 and auxiliary electrode contact pin 25 are provided with one stage signal amplification on signal amplification circuit plate 3
Circuit 31, second signal amplifying circuit 32 and four electrode jacks 33 are provided with analog-digital converter on main control board 4
41, low pressure difference linear voltage regulator 42, single-chip microcontroller 43 and Temperature Humidity Sensor 44 are provided with positive pole on interface card 5 and draw
Foot 51, power cathode pin 52, data receiver pin 53, data send pin 54, direction controlling pin 55, function and select pin
56 and reserved pin 57, main control board 4 is arranged between signal amplification circuit plate 3 and interface card 5, signal amplification circuit
Be provided with power pin 6 and analog signal contact pin 7 between plate 3 and main control board 4, main control board 4 and interface card 5 it
Between be provided with power pin 6 and digital signal pin 8, sealing ring 21 is in contact with metal protection filter screen 16, and working electrode is slotting
Needle 22 is respectively inserted into four electrode jacks 33 electrode contact pin 23, reference electrode contact pin 24 and auxiliary electrode contact pin 25, connects
Interface circuit board 5 is in contact with lower positioning plane 19, positive pole pin 51, power cathode pin 52, data receiver pin 53, number
It is extended to down according to pin 54, direction controlling pin 55, function selection pin 56 and reserved pin 57 is sent across installation via hole 18
Outside shell 12.
The novel gaseous state pollutant concentration electrochemical sensor uses stratification assembling design, is followed successively by metal from top to bottom
Protect filter screen, electrochemistry sensing element, signal amplification circuit plate, main control board and interface card, outside be provided with
Protection installation shell, for protecting internal sensing element and circuit board.
Electrochemistry sensing element is provided with working electrode, to four electrode, reference electrode and auxiliary electrode electrodes, work
Electrode is separated by a thin layer electrolyte with to electrode and is connected to external circuit via the resistance of a very little, when gas diffusion enters
After sensor, oxidation or reduction reaction are carried out in working electrode surface, electric current is generated and two electrodes is flowed through by external circuit.
The concentration of gas and the proportional relationship of the size of the electric current can be measured by measuring foreign current；Outside reference electrode is connected
One potentiostatic circuit, make between working electrode and reference electrode keep a fixed voltage value, due in reference electrode without electricity
Stream flows through, therefore reference electrode and working electrode are kept at a constant point, and working electrode is avoided to generate polarization.Auxiliary
Electrode and working electrode are present in the same environment, but auxiliary electrode is not involved in electrochemical reaction, thus by working electrode and
Reference value of the difference of auxiliary electrode as gas concentration, measurement error caused by counteracting because of environmental change.
Two-stage amplifying circuit is provided on signal amplification circuit plate, the effect of one stage signal amplifying circuit is by working electrode
It is amplified with the micro current signal of auxiliary electrode, amplification factor can adjust corresponding according to the indicatrix of different sensing elements
Resistance be adjusted.Second signal amplifying circuit is used as current-to-voltage convertor, for the sensitive member of electrochemistry of access
Part chemical reaction type is different, and what some were generated is oxidation reaction, and the output electric current generated in work and auxiliary electrode is positive
(such as CO, SO2), some generate be reduction reaction, the output electric current generated in work and auxiliary electrode be negative (such as NO2,
O3).This corresponding characteristic, is provided with resistor network between firsts and seconds signal amplification circuit, by welding position
Selection, so that the voltage signal of final output is positive.Furthermore the other all sensing elements (such as NO) for needing biased operation are directed to,
Bias setting can also be carried out by the resistance of selection welding different location.
Analog-digital converter, low pressure difference linear voltage regulator, single-chip microcontroller and temperature and humidity sensing are provided on main control board
Device, single-chip microcontroller, which controls analog-digital converter and converts analog voltage signal to digital signal and acquire data, enters single-chip microcontroller,
Single-chip microcontroller acquires ambient temperature and humidity by Temperature Humidity Sensor in real time simultaneously, data of the Temperature and Humidity module reference when as calibration, monolithic
Machine and Temperature Humidity Sensor are powered by the power supply that low pressure difference linear voltage regulator converts.
Interface card is responsible for carrying out communication and external electricity with the equipment of sensor external, is provided with seven on plate and draws
Foot, respectively positive pole pin, power cathode pin, data receiver pin, data send pin, direction controlling pin, function
It can select pin and reserved pin.
Power supply connection and data communication are carried out by contact pin between three layer circuit boards.Three layer circuit boards link together and electricity
Chemical sensor is combined into an entirety, and is set to protection installation enclosure interior.Electrochemistry sensing element and protection installation
It is provided with metal protection filter screen between shell, for filtering out interfering substance, large particulate matter is avoided to block ventilation inlet channel.
The novel gaseous state pollutant concentration electrochemical sensor takes difference using working electrode and the output of auxiliary electrode two-way
As a result, measurement error caused by can offsetting because of environmental change, improves sensor overall stability；It is put by adjusting signal
Resistance position and resistance value on large circuit board can access four electrode sensing elements of different electrochemical reaction types, be suitable for more
The parameter acquisition of kind gaseous pollutant characteristic index；The Temperature Humidity Sensor being arranged on main control board cooperates inside single-chip microcontroller
Calibration procedure facilitate factory calibration and user's periodic calibration；On interface card there is function to select pin, user can basis
The level height for configuring the pin, selects different transport protocols, keeps sensor application more flexible.
Claims (1)
1. a kind of novel gaseous state pollutant concentration electrochemical sensor, which is characterized in that including protection installation shell (1), electrification
Learn sensing element (2), signal amplification circuit plate (3), main control board (4) and interface card (5), electrochemistry sensing element
(2), signal amplification circuit plate (3), main control board (4) and interface card (5) are sequentially arranged at protection installation shell (1)
Inside, the shape of protection installation shell (1) are in cylindrical shape, including upper housing (11) and lower case (12), upper housing (11)
Centre be provided with installation cavity (13), the top of upper housing (11) is provided with fan inlet (14), fan inlet (14)
It being connected to upper installation cavity (13), the internal diameter of fan inlet (14) is less than the internal diameter of upper installation cavity (13), between
There is upper positioning plane (15), is provided with metal protection filter screen (16) on upper positioning plane (15), the centre of lower case (12) is set
It is equipped with lower installation cavity (17), the bottom end of lower case (12) is provided with installation via hole (18), installation via hole (18) and lower installation cavity
(17) be connected to, installation via hole (18) internal diameter be less than lower installation cavity (17) internal diameter, between have lower positioning plane
(19), upper housing (11) and lower case (12) are threadedly coupled, and upper installation cavity (13) is connected with lower installation cavity (17), and electrochemistry is quick
Be provided at the top of sensing unit (2) sealing ring (21), bottom be provided with working electrode contact pin (22), to electrode contact pin (23),
Reference electrode contact pin (24) and auxiliary electrode contact pin (25), signal amplification circuit plate are provided with one stage signal amplifying circuit on (3)
(31), second signal amplifying circuit (32) and four electrode jacks (33), main control board are provided with Analog-digital Converter on (4)
Device (41), low pressure difference linear voltage regulator (42), single-chip microcontroller (43) and Temperature Humidity Sensor (44), interface card are arranged on (5)
There are positive pole pin (51), power cathode pin (52), data receiver pin (53), data to send pin (54), direction control
Pin (55), function selection pin (56) and reserved pin (57) processed, main control board (4) are arranged in signal amplification circuit plate
(3) between interface card (5), power pin (6) are provided between signal amplification circuit plate (3) and main control board (4)
With analog signal contact pin (7), power pin (6) and digital signal are provided between main control board (4) and interface card (5)
Contact pin (8), sealing ring (21) are in contact with metal protection filter screen (16), working electrode contact pin (22), to electrode contact pin (23),
Reference electrode contact pin (24) and auxiliary electrode contact pin (25) are respectively inserted into four electrode jacks (33), interface card (5)
It is in contact with lower positioning plane (19), positive pole pin (51), power cathode pin (52), data receiver pin (53), number
Installation via hole is passed through according to pin (54), direction controlling pin (55), function selection pin (56) and reserved pin (57) is sent
(18) it is external to extend to lower case (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820760087.6U CN208140628U (en) | 2018-05-16 | 2018-05-16 | A kind of novel gaseous state pollutant concentration electrochemical sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820760087.6U CN208140628U (en) | 2018-05-16 | 2018-05-16 | A kind of novel gaseous state pollutant concentration electrochemical sensor |
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| Publication Number | Publication Date |
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| CN208140628U true CN208140628U (en) | 2018-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802150A (en) * | 2018-05-16 | 2018-11-13 | 罗克佳华科技集团股份有限公司 | A kind of novel gaseous state pollutant concentration sensor based on four electrode systems |
-
2018
- 2018-05-16 CN CN201820760087.6U patent/CN208140628U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802150A (en) * | 2018-05-16 | 2018-11-13 | 罗克佳华科技集团股份有限公司 | A kind of novel gaseous state pollutant concentration sensor based on four electrode systems |
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