CN107340323A - A kind of formaldehyde detector - Google Patents
A kind of formaldehyde detector Download PDFInfo
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- CN107340323A CN107340323A CN201710442770.5A CN201710442770A CN107340323A CN 107340323 A CN107340323 A CN 107340323A CN 201710442770 A CN201710442770 A CN 201710442770A CN 107340323 A CN107340323 A CN 107340323A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract
The invention discloses a kind of formaldehyde detector, including housing, air inlet on housing, display screen, ON/OFF switch, detection key and query key are arranged on, the circuit main board of enclosure interior, signal receiving unit, 89C51 single-chip microcomputers, power supply is arranged on and the electrochemical sensor for detecting formaldehyde is turned on and be used for air inlet；The circuit main board is connected with electrochemical sensor, ON/OFF switch, detection key, query key and power supply respectively, the electrochemical sensor is also connected with signal receiving unit, the signal receiving unit is also connected with 89C51 single-chip microcomputers, and the 89C51 single-chip microcomputers are also connected with display screen；The present invention is based on easy to operate electrochemical sensor, compact, is easy to carry, with good selectivity, when effectively overcoming general electrochemical sensor detection low concentration formaldehyde because disturbing factor is excessive and caused by the low difficulty of resolution ratio, with low test limit, detector of the present invention has good stability and accuracy.
Description
Technical field
The present invention relates to a kind of formaldehyde detector.
Background technology
Formaldehyde, chemical formula HCHO or CH2O, also known as formaldehyde, colourless gas, there is special penetrating odor, to human eye, nose etc.
There are stimulation, soluble in water and ethanol.The main harm of formaldehyde is shown as to mucocutaneous stimulation, and formaldehyde is indoors
When reaching finite concentration, people just has sense of discomfort.More than 0.08m3Concentration of formaldehyde furious, eye can be caused to itch, throat discomfort or pain
Bitterly, hoarseness, sneeze, uncomfortable in chest, asthma, dermatitis etc..Newly-decorated room content of formaldehyde is higher, is that the main of numerous diseases lures
Cause.Formaldehyde is classified as dangerous carcinogenic and important environmental contaminants by the World Health Organization and Environmental Protection Agency USA, in China
In toxic chemical priority acccess control list, formaldehyde is at the second place.Indoor formaldehyde main source is domestic finishing material and furniture.
It is main artificial including the composite wood containing phenolic resin and Lauxite, containing urea-formaldehyde resin adhesive and melamine resin adehsive
Adhesive that plate, composite furniture use and outwardly coating of emitting formaldehyde composition etc..Therefore the detection of PARA FORMALDEHYDE PRILLS(91,95) has very much
It is necessary.
The sensor of existing formaldehyde detector has many kinds, such as becomes color method, Production by Catalytic Combustion Process, gas-chromatography and liquid chromatogram
The general small volume of method, electrochemical process etc., wherein electrochemical sensor, it is easy to operate, it is moderate, and combine accurate electrode
Technology of preparing and machining are horizontal, can reach the detection of ppb levels, typically can reach good detection selectivity.But mesh
The electrochemistry formaldehyde detector of preceding in the market still suffers from many deficiencies, for example detects limit for height, and resolution ratio is low, poor selectivity, stable
Property is bad, the problems such as portability difference.When detecting super low concentration, the interference from gas, due to temperature and humidity change
Caused by sensor signal change can all give correctly detection concentration of formaldehyde bring difficulty, therefore be difficult to accomplish selectivity and standard
True property.
To sum up, how to design a kind of with good selectivity and accuracy and the high electrochemistry formaldehyde examination of portability
Device, become for those skilled in the art's urgent need to resolve the problem of one of.
The content of the invention
For above-mentioned the deficiencies in the prior art, the invention provides a kind of formaldehyde detector.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of formaldehyde detector, including housing, air inlet, display screen, ON/OFF switch, the detection key being arranged on housing
And query key, it is arranged on the circuit main board of enclosure interior, signal receiving unit, 89C51 single-chip microcomputers, power supply and is turned on air inlet
And for detecting the electrochemical sensor of formaldehyde；The circuit main board respectively with electrochemical sensor, ON/OFF switch, detection key,
Query key is connected with power supply, and the electrochemical sensor is also connected with signal receiving unit, the signal receiving unit also with
89C51 single-chip microcomputers are connected, and the 89C51 single-chip microcomputers are also connected with display screen；
The electrochemical sensor includes shell, electrolyte chamber, electrolyte and transmits material, seal member, sender unit cap, pipe
Pin, working electrode, compensating electrode and to electrode, the bottom that the electrolyte chamber is located at enclosure are used to contain electrolyte, institute
State electrolyte transmission material to spread in electrolyte chamber and extend to the top of electrolyte chamber, the seal member bottom surface, which is located at, prolongs
The upper outer of electrolyte chamber is extended, above below working electrode and compensating electrode, around the Zhou Bingyu of shell inner cavity one
Shell inner cavity wall is in close contact, and the duct of electrolysis matter transmission is left among its bottom surface, described to be located at electrolyte chamber to electrode
Top and embedded electrolyte transmit in material and seal member, the sender unit cap matches with shell and is used to close entirely
Sensor, the pin extend from outer casing bottom, and the compensating electrode is consistent with the characteristic of working electrode, the compensating electrode
It is located on same working face but is isolated in different spaces from working electrode, the electrochemical sensor PARA FORMALDEHYDE PRILLS(91,95) measure
Signal output is the difference of the output of working electrode and compensating electrode；
The working electrode and compensating electrode of the electrochemical sensor are gas-diffusion electrode, are set above the working electrode
There is the first diffusion hole, be provided with the second diffusion hole above the compensating electrode, be provided with and be used between compensating electrode and working electrode
Prevent gas mixing between working electrode and compensating electrode or the dividing plate interpenetrated.
Further, the external serial ports being connected with 89C51 single-chip microcomputers is provided with the housing.
Further, the fan of inside is provided through on the housing.
Further, the display screen is LCD display.
Compared with prior art, the invention has the advantages that：
Detector of the present invention can store in time with real-time display measurement result and to detection data, can be with query history number
According to showing historical data and current data, can be communicated with computer by external serial ports, inquired about on computer terminals
Comparative result, the setting of fan can be very good the formaldehyde gas of discharge residual or other gases affect factors, effective to ensure
The accuracy of measurement result, LCD display have the advantages of low power consumption and zero radiation.The electrochemical sensor of the present invention passes through
Introduce one it is parallel and deduct the influence of interference gas with the unlimited consistent compensating electrode of working electrode characteristic, also deduct
The detection error caused by environment temperature or humidity change, has accomplished selectivity, effectively overcomes general electrochemical sensor inspection
When surveying low concentration formaldehyde because disturbing factor is excessive and caused by the low difficulty of resolution ratio, there is low test limit, also overcome operation
Complexity and the shortcomings that can not continuously measuring.Therefore detector of the present invention has good stability and accuracy.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of the present invention.
Fig. 2 is the electrochemical sensor schematic diagram of the present invention.
Wherein, it is entitled corresponding to reference：
1- housings, 2- air inlets, 3- display screens, 4- ON/OFF switches, 5- detection keys, 6- query keys, 7- circuit main boards, 8-
Power supply, 9- electrochemical sensors, 10- shells, 11- electrolyte chambers, 12- electrolyte transmit material, 13- seal members, 14- sensings
Device lid, 15- pins, 16- working electrodes, 17- compensating electrodes, 18- is to electrode, the diffusion holes of 19- first, the diffusion holes of 20- second,
21- dividing plates, the external serial ports of 22-, 23- fans.
Embodiment
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and embodiments of the present invention are included but not
It is only limitted to following examples.
A kind of formaldehyde detector as shown in Figure 1, 2, including housing 1, be arranged on air inlet 2 on housing 1, display screen 3,
ON/OFF switch 4, detection key 5 and query key 6, circuit main board 7, signal receiving unit, the 89C51 monolithics being arranged on inside housing 1
Mechanical, electrical source 8 and the electrochemical sensor 9 for detecting formaldehyde is turned on and is used for air inlet；The circuit main board 7 respectively with electrochemistry
Sensor 9, ON/OFF switch 4, detection key 5, query key 6 and power supply 8 connect, and the electrochemical sensor 9 also receives single with signal
Member connection, the signal receiving unit are also connected with 89C51 single-chip microcomputers, and the 89C51 single-chip microcomputers are also connected with display screen 3；
The electrochemical sensor 9 includes shell 10, electrolyte chamber 11, electrolyte and transmits material 12, seal member 13, passes
Sensor lid 14, pin 15, working electrode 16, compensating electrode 17 and electrode 18, the electrolyte chamber 11 are located inside shell 10
Bottom be used to contain electrolyte, the electrolyte transmits material 12 and is spread in electrolyte chamber 11 and extend to electrolyte chamber 11
Top, the bottom surface of seal member 13, which is located at, extends to the upper outer of electrolyte chamber 11, is located at the He of working electrode 16 above
Below compensating electrode 17, it is in close contact around 10 inner chamber of shell one week and with the internal chamber wall of shell 10, is left among its bottom surface
The duct of electrolysis matter transmission, the top that electrolyte chamber 11 is located to electrode 18 and embedded electrolyte transmit material 12 and close
Seal in part 13, the sender unit cap 14 and shell 10 match and for closing whole sensor, and the pin 15 is from shell
10 bottoms are extended, and the compensating electrode 17 is consistent with the characteristic of working electrode 16, the compensating electrode 17 and working electrode 16
On same working face but it is isolated in different spaces, the signal output of the PARA FORMALDEHYDE PRILLS(91,95) of electrochemical sensor 9 measure
It is the difference of the output of working electrode 16 and compensating electrode 17.
The working electrode 16 and compensating electrode 17 of the electrochemical sensor 9 are gas-diffusion electrode, the working electrode
16 tops are provided with the first diffusion hole 19, and the top of compensating electrode 17 is provided with the second diffusion hole 20, compensating electrode 17 and work electricity
The dividing plate 21 for preventing gas mixing between working electrode 16 and compensating electrode 17 or interpenetrating is provided between pole 16.
The external serial ports 24 being connected with 89C51 single-chip microcomputers is provided with the housing 1.
The fan 25 of inside is provided through on the housing 1.
The display screen 3 is LCD display.
Detector of the present invention can store in time with real-time display measurement result and to detection data, can be with query history number
According to showing historical data and current data, can be communicated with computer by external serial ports, inquired about on computer terminals
Comparative result, the setting of fan can be very good the formaldehyde gas of discharge residual or other gases affect factors, effective to ensure
The accuracy of measurement result, LCD display have the advantages of low power consumption and zero radiation.The electrochemical sensor of the present invention passes through
Introduce one it is parallel and deduct the influence of interference gas with the unlimited consistent compensating electrode of working electrode characteristic, also deduct
The detection error caused by environment temperature or humidity change, has accomplished selectivity, effectively overcomes general electrochemical sensor inspection
When surveying low concentration formaldehyde because disturbing factor is excessive and caused by the low difficulty of resolution ratio, there is low test limit, also overcome operation
Complexity and the shortcomings that can not continuously measuring.Therefore detector of the present invention has good stability and accuracy.
The present invention is based on easy to operate electrochemical sensor, compact, is easy to carry, and has good selectivity, has
When effect overcomes general electrochemical sensor detection low concentration formaldehyde because disturbing factor is excessive and caused by the low difficulty of resolution ratio,
With low test limit, the shortcomings that also overcoming complex operation and can not continuously measure, detector of the present invention has stable well
Property and accuracy, have very high application and popularization value.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention
Enclose, all body design thought in the present invention and that mentally makes have no the change of essential meaning or polishing, what it was solved
Technical problem is still consistent with the present invention, should be included within protection scope of the present invention.
Claims (4)
- A kind of 1. formaldehyde detector, it is characterised in that including housing (1), air inlet (2), the display screen being arranged on housing (3), ON/OFF switch (4), detection key (5) and query key (6), it is arranged on the circuit main board (7) of enclosure interior, signal receives list Member, 89C51 single-chip microcomputers, power supply (8) and the electrochemical sensor (9) for detecting formaldehyde is turned on and is used for air inlet；The circuit Mainboard is connected with electrochemical sensor, ON/OFF switch, detection key, query key and power supply respectively, the electrochemical sensor also with Signal receiving unit connects, and the signal receiving unit is also connected with 89C51 single-chip microcomputers, the 89C51 single-chip microcomputers also with display Screen connection；The electrochemical sensor includes shell (10), electrolyte chamber (11), electrolyte and transmits material (12), seal member (13), sender unit cap (14), pin (15), working electrode (16), compensating electrode (17) and to electrode (18), the electrolyte chamber It is used to contain electrolyte positioned at the bottom of enclosure, the electrolyte transmits material and spreads in electrolyte chamber and extend to electricity Solve the top of matter chamber, the seal member bottom surface, which is located at, extends to the upper outer of electrolyte chamber, above positioned at working electrode and Below compensating electrode, it is in close contact around shell inner cavity one week and with shell inner cavity wall, electrolysis is left among its bottom surface The duct of matter transmission, the top that electrolyte chamber is located to electrode and embedded electrolyte are transmitted in material and seal member, institute State sender unit cap to match with shell and be used to close whole sensor, the pin extends from outer casing bottom, the compensation Electrode is consistent with the characteristic of working electrode, and the compensating electrode is located on same working face with working electrode but is isolated in difference Space in, the signal output of electrochemical sensor PARA FORMALDEHYDE PRILLS(91,95) measure is the difference of the output of working electrode and compensating electrode；The working electrode and compensating electrode of the electrochemical sensor are gas-diffusion electrode, and the is provided with above the working electrode One diffusion hole (19), the compensating electrode top are provided with the second diffusion hole (20), are provided between compensating electrode and working electrode For preventing gas mixing between working electrode and compensating electrode or the dividing plate interpenetrated (21).
- 2. a kind of formaldehyde detector according to claim 1, it is characterised in that be provided with the housing mono- with 89C51 The external serial ports (24) of piece machine connection.
- 3. a kind of formaldehyde detector according to claim 1, it is characterised in that inside is provided through on the housing Fan (25).
- 4. a kind of formaldehyde detector according to claim 1, it is characterised in that the display screen is LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442770.5A CN107340323A (en) | 2017-06-13 | 2017-06-13 | A kind of formaldehyde detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442770.5A CN107340323A (en) | 2017-06-13 | 2017-06-13 | A kind of formaldehyde detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107340323A true CN107340323A (en) | 2017-11-10 |
Family
ID=60221479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710442770.5A Pending CN107340323A (en) | 2017-06-13 | 2017-06-13 | A kind of formaldehyde detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107340323A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759368A (en) * | 1996-05-11 | 1998-06-02 | Dragerwerk Aktiengesellschaft | Electrochemical gas sensor |
| CN101571506A (en) * | 2008-04-29 | 2009-11-04 | 华瑞科学仪器(上海)有限公司 | Formaldehyde sensor |
| CN204330667U (en) * | 2015-01-14 | 2015-05-13 | 江西科技学院 | A kind of hand held methylene oxide detecting instrument |
| CN206161578U (en) * | 2016-11-11 | 2017-05-10 | 广东中协和检测有限公司 | Formaldehyde electrochemical detection device |
-
2017
- 2017-06-13 CN CN201710442770.5A patent/CN107340323A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759368A (en) * | 1996-05-11 | 1998-06-02 | Dragerwerk Aktiengesellschaft | Electrochemical gas sensor |
| CN101571506A (en) * | 2008-04-29 | 2009-11-04 | 华瑞科学仪器(上海)有限公司 | Formaldehyde sensor |
| CN204330667U (en) * | 2015-01-14 | 2015-05-13 | 江西科技学院 | A kind of hand held methylene oxide detecting instrument |
| CN206161578U (en) * | 2016-11-11 | 2017-05-10 | 广东中协和检测有限公司 | Formaldehyde electrochemical detection device |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171110 |
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| WD01 | Invention patent application deemed withdrawn after publication |