CN201689072U - Electrochemical oxygen analyzer - Google Patents
Electrochemical oxygen analyzer Download PDFInfo
- Publication number
- CN201689072U CN201689072U CN2010201590770U CN201020159077U CN201689072U CN 201689072 U CN201689072 U CN 201689072U CN 2010201590770 U CN2010201590770 U CN 2010201590770U CN 201020159077 U CN201020159077 U CN 201020159077U CN 201689072 U CN201689072 U CN 201689072U
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- Prior art keywords
- oxygen
- module
- electrically connected
- chemical formula
- control chip
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Abstract
The utility model discloses an electrochemical oxygen analyzer which comprises a human-machine interface, a circuit main board, an oxygen sensor chamber, a gas sample inlet, an inspection gas inlet and a gas outlet, wherein the gas sample inlet is in pipe connection with a sampling pump, an outlet of which is in pipe connection with a filter, an outlet of the filter is in pipe connection with a flow control valve, the inspection gas inlet is in pipe connection between an outlet of the filter and an inlet of the flow control valve, and the flow control valve and the gas outlet are respectively in pipe connection at two ends of the oxygen sensor chamber; and the electrochemical oxygen analyzer has the advantages of being not influenced by reducing gas, and being capable of analyzing the oxygen content rapidly without maintenance and the treatment of a gas sample.
Description
Technical field
The utility model relates to a kind of environmental pollution monitoring equipment, especially relates to a kind of electric chemical formula oxygen analyser that adopts the electrochemical method oxygen determination.
Background technology
The oxygen concentration detection method has paramagnetic formula and zirconia formula at present:
One. the paramagnetic formula
Comprise three kinds of oxygen analyzers such as Thermomagnetic type, magnetic pressure formula, magnetic mechanical formula, be generally the on-line detector table, be used for the oxygen content of automatic continuous analysis gas.Its principle of work is all based on paramagnetic property of oxygen.And thermomagnetic convection, pressure differential, density gradient are converted into electric signal, thereby realize the measurement of oxygen concentration in the tested gas by detecting element.Shortcoming; Environment temperature and power supply are had higher requirement, need reference gas and the impurity of drop and dust and so on can not be arranged, magnetic-type lambda sensor price is also relatively more expensive.
Two. the zirconia formula
Zirconia sensor at high temperature, when the interelectrode oxygen content in both sides not simultaneously, produce electromotive force between two electrodes, constitute oxygen concentration cell, reaction is as follows between two electrodes:
Cathode reaction: O
2+ 4e → 20
2-Anode reaction: 20
2-→ O
2+ 4e
Zirconium doxide oxygen analyzer is exactly this characteristic of utilizing zirconia sensor, converts the oxygen in the detected environment to electric signal and handles by electronic unit then, and show with concentration value.Shortcoming; Environment requirement than higher, need be heated by 700 high temperature of spending, need real-time control heating-up temperature, high temperature makes lambda sensor inconvenient than weak point and installation serviceable life.
Summary of the invention
At problem set forth above, the utility model purpose is to provide a kind of influence that is not subjected to reducibility gas in the tested gas, does not need quick, the non-maintaining electric chemical formula oxygen analyser of sample gas disposal.
The utility model is realized by following technical measures, a kind of electric chemical formula oxygen analyser, comprise man-machine interface, circuit main board, lambda sensor chamber, be sealed in the indoor electrochemistry oxygen sensor of lambda sensor, sample gas inlet, school inspection gas inlet, gas vent, sample gas inlet tube is connected to sampling pump, the outlet of sampling pump is connected to filtrator, the outlet of filtrator is connected to flowrate control valve, also connect with school inspection gas inlet tube between the outlet of filtrator and the inlet of flowrate control valve, flowrate control valve, gas vent divide no matter are connected on the two ends of oxygen sensing chamber; Described circuit main board comprises control chip, be connected electrically in reservoir on the control chip, be connected electrically in the A/D modular converter on the control chip, circuit main board is electrically connected with man-machine interface, flowrate control valve and sampling pump respectively, and the A/D modular converter on the circuit main board is connected with the electrochemistry oxygen sensor electrical by amplifying compensating module.
Above-mentioned man-machine interface comprises display screen and button; The electrochemistry oxygen sensor comprises highly active oxygen electrode and lead electrode in the solution that is immersed in KOH, and the KOH solution and the external world have one deck macromolecule membrane to separate.
The preferred Embedded A TMEGA64L processor of above-mentioned control chip.
Give central station in order to detect information uploading, control chip of the present utility model be electrically connected with in RS232 module, RS485 module, ADSL Wideband module, the GPRS module any one or several arbitrarily.
In order to detect the duty of miscellaneous equipment simultaneously, also be electrically connected with at least one road external digital switching value signal access port on the control chip of the present utility model, the on off state of the peripherals that this external digital switching value signal access port can will be electrically connected with it sends control chip to.
In order to handle the signal that miscellaneous equipment is gathered, also can be electrically connected with a current/voltage-converted module between described A/D modular converter and the amplification compensating module, at least be electrically connected with one tunnel acquisition interface on this current/voltage-converted module, this acquisition interface can be gathered the curtage signal of the peripherals that is electrically connected with it.
Principle of work of the present utility model: the electrochemistry oxygen sensor generally is made of highly active oxygen electrode and lead electrode, is immersed in the solution of KOH.Be reduced into hydroxide ion at negative electrode oxygen, and oxidized at anode lead.
O
2+2H
2O+4e→40H
- 2Pb+40H
-→2Pb(OH)
2+4e
The KOH solution and the external world have one deck macromolecule membrane to separate, and sample gas does not directly enter sensor, thereby solution and lead electrode need not regularly clean or replace.Oxygen molecule in the sample gas is diffused into by macromolecule membrane and carries out electrochemical reaction in the oxygen electrode, the electric current that produces in the electrochemical reaction is decided by to be diffused into the oxygen molecule number of oxygen electrode, and the rate of diffusion of oxygen is proportional to the oxygen content in the sample gas, like this, this sensor output signal size is only relevant with oxygen content in the sample gas, and has nothing to do with gas gross by sensor.By the connection of external circuit, it is the size and the oxygen relation in direct ratio of participating in reaction of electric current that the electric charge in the reaction shifts.
Adopt the utility model to carry out oxygen determination, can not be subjected to the influence of reducibility gas in the tested gas, removed many sample gas processing systems from.It is quicker than old-fashioned " golden net-lead " primary element oxygen determination, do not need very long start to blow down process, " golden net-lead " primary element sample gas directly enters in the solution, cause the maintenance of instrument very big, and fuel cell method sample gas does not directly enter in the solution, sensor can highly stable reliable work really long days, can accomplish non-maintaining fully.
When the utility model carried out oxygen determination, the temperature of tested gas did not need too high or too low, and 0～35 ℃ gets final product under the normal temperature, need not heating; Need not to feed reference gas during measurement, thereby it is simple to measure gas circuit.Reaction is very fast, needs the long period preheating unlike the zirconia formula; Measurement range; 0～100%O
2, be not subjected to CO
2, CO, H
2S, NOx, H
2Influence.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the circuit block diagram of the utility model embodiment 1;
Fig. 3 is the circuit block diagram of the utility model embodiment 2;
Fig. 4 is the circuit block diagram of the utility model embodiment 3;
Fig. 5 is the circuit block diagram of the utility model embodiment 4.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of electric chemical formula oxygen analyser, comprise the sample gas inlet 10, school inspection gas inlet 8, gas vent 1, LCD display 5 and the keyboard 4 that are installed on the tool housing, in enclosure interior circuit main board 6, lambda sensor chamber 3, sampling pump 2 are installed then, filtrator 9, and flowrate control valve 7, the outlet of filtrator 9 and flowrate control valve 7 pipes connect, also connect flowrate control valve 7 and gas vent 1 minute no matter be connected on the two ends of lambda sensor chamber 3 between the inlet of the outlet of filtrator 9 and flowrate control valve 7 with school inspection gas 8 pipes that enter the mouth; Be sealed with electrochemistry oxygen sensor 301 in the lambda sensor chamber 3, circuit main board 6 comprises Embedded A TMEGA64L processor 701, be connected electrically in FLASHROM reservoir 704 on the Embedded A TMEGA64L processor 701, be connected electrically in the A/D modular converter 703 on the Embedded A TMEGA64L processor 701, circuit main board 6 is electrically connected with LCD display 5, keyboard 4, flowrate control valve 7 and sampling pump 2 respectively, and the A/D modular converter 703 on the circuit main board 6 is electrically connected with electrochemistry oxygen sensor 301 by amplifying compensating module 702.
Embedded A TMEGA64L processor 701 Control Flow operation valves 7 and sampling pump 2 are drawn into lambda sensor chamber 3 from sample gas inlet 10 or school inspection gas inlet 8 with sample gas or school inspection gas, the electrochemistry oxygen sensor 301 that is sealed in the lambda sensor chamber 3 mainly is made of highly reactive form of oxygen electrode and lead electrode in the solution that is immersed in KOH, be reduced into hydroxide ion at negative electrode oxygen, and oxidized at anode lead.
O
2+2H
2O+4e→4OH
- 2Pb+4OH
-→2Pb(OH)
2+4e
The KOH solution and the external world have one deck macromolecule membrane to separate, and sample gas or school inspection gas does not directly enter electrochemistry oxygen sensor 301, thereby solution and lead electrode need not regularly clean or replace.Oxygen molecule in sample gas or the school inspection gas is diffused into by macromolecule membrane and carries out electrochemical reaction in the oxygen electrode, the electric current that produces in the electrochemical reaction is decided by to be diffused into the oxygen molecule number of oxygen electrode, and the rate of diffusion of oxygen is proportional to the oxygen content in the sample gas, like this, this electrochemistry oxygen sensor 301 output signals size is only relevant with oxygen content in the sample gas, and has nothing to do with gas gross by electrochemistry oxygen sensor 301.Connection by external circuit, it is the size and the oxygen relation in direct ratio of participating in reaction of electric current that electric charge in the reaction shifts, produce analog electrical signal by electrochemistry oxygen sensor 301, after this analog electrical signal compensates through the amplification of amplifying compensating module 702, carry out the A/D conversion by A/D modular converter 703, obtain digital signal, and carry out mathematical modeling by Embedded A TMEGA64L processor 701 internal system, calculate measured value, on LCD display 5, show oxygen concentration then, and can be by the concentration value of keyboard 5 inquiry per minutes, in addition, ATMEGA64L processor 701 also can be stored in measured value in the FLASHROM reservoir 704 of 8Mbytes.Gas after the analysis drains into the external world by gas vent 1.
As Fig. 1, shown in Figure 3, a kind of electric chemical formula oxygen analyser with monitoring four road peripherals, on Embedded A TMEGA64L processor 701, also be electrically connected with four road external digital switching value signal access ports 705 with embodiment 1 different being in, every road external digital switching value signal access port 705 is electrically connected a peripherals, can also send the on off state of four road peripherals of correspondence to Embedded A TMEGA64L processor 701 on the basis of carrying out the oxygen analysis as embodiment 1.
As Fig. 1, shown in Figure 4, a kind of electric chemical formula oxygen analyser that can gather the signal of four road peripherals, different with embodiment 1 be in, also can be electrically connected with a current/voltage-converted module 706 between A/D modular converter 703 and the amplification compensating module 702, be electrically connected with four tunnel acquisition interface 707 on this current/voltage-converted module 706, this acquisition interface 707 can be gathered the curtage signal of the peripherals that is electrically connected with it, and sends Embedded A TMEGA64L processor 701 to.
As Fig. 1, shown in Figure 5, a kind of electric chemical formula oxygen analyser with networking function, different with embodiment 1,2,3 be in, also be electrically connected with RS232 module 708, ADSL Wideband module 709 and GPRS module 710 on the Embedded A TMEGA64L processor 701, this analysis instrument can be gathered each channel data, storage according to the collection period of this locality or the long-range setting of central station, is uploaded to central station also from being presented on the LCD display 5 by GPRS/RS232/ADSL.Thereby composing environment pollutes on-line monitoring system.The device address is set to 1-14 ascii character, is distributed unitedly by central station.This mode has realized the function of long-distance transmissions and real-time online, has accomplished the on-the-spot situation of accurately real reaction in real time.
More than be that the utility model electric chemical formula oxygen analyser is set forth; be used for helping to understand the utility model; but embodiment of the present utility model is not restricted to the described embodiments; anyly do not deviate from the change done under the utility model principle, modification, substitute, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (7)
1. electric chemical formula oxygen analyser, it is characterized in that: comprise man-machine interface, circuit main board, lambda sensor chamber, sample gas inlet, school inspection gas inlet, gas vent, sample gas inlet tube is connected to sampling pump, the outlet of sampling pump is connected to filtrator, the outlet of filtrator is connected to flowrate control valve, also connect with school inspection gas inlet tube between the outlet of filtrator and the inlet of flowrate control valve, flowrate control valve and gas vent divide no matter are connected on the two ends of lambda sensor chamber; The indoor electrochemistry oxygen sensor that is sealed with of described lambda sensor, described circuit main board comprises control chip, be connected electrically in reservoir on the control chip, be connected electrically in the A/D modular converter on the control chip, circuit main board is electrically connected with man-machine interface, flowrate control valve and sampling pump respectively, and the A/D modular converter on the circuit main board is connected with the electrochemistry oxygen sensor electrical by amplifying compensating module.
2. electric chemical formula oxygen analyser according to claim 1 is characterized in that: described man-machine interface comprises display screen and button.
3. electric chemical formula oxygen analyser according to claim 1 is characterized in that: described electrochemistry oxygen sensor comprises highly active oxygen electrode and lead electrode in the solution that is immersed in KOH, and the KOH solution and the external world have one deck macromolecule membrane to separate.
4. electric chemical formula oxygen analyser according to claim 1 is characterized in that: described control chip is an Embedded A TMEGA64L processor.
5. electric chemical formula oxygen analyser according to claim 1 is characterized in that: described control chip be electrically connected with in RS232 module, RS485 module, ADSL Wideband module, the GPRS module any one or several arbitrarily.
6. electric chemical formula oxygen analyser according to claim 5, it is characterized in that: described control chip is electrically connected with at least one road external digital switching value signal access port, and the on off state of the peripherals that this external digital switching value signal access port can will be electrically connected with it sends control chip to.
7. electric chemical formula oxygen analyser according to claim 1, it is characterized in that: be electrically connected with a current/voltage-converted module between described A/D modular converter and the amplification compensating module, at least be electrically connected with one tunnel acquisition interface on this current/voltage-converted module, this acquisition interface can be gathered the curtage signal of the peripherals that is electrically connected with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201590770U CN201689072U (en) | 2010-04-09 | 2010-04-09 | Electrochemical oxygen analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201590770U CN201689072U (en) | 2010-04-09 | 2010-04-09 | Electrochemical oxygen analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201689072U true CN201689072U (en) | 2010-12-29 |
Family
ID=43377352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201590770U Expired - Lifetime CN201689072U (en) | 2010-04-09 | 2010-04-09 | Electrochemical oxygen analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201689072U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507246A (en) * | 2018-11-26 | 2019-03-22 | 江苏威尔安智能科技有限公司 | Oxygen content detector |
-
2010
- 2010-04-09 CN CN2010201590770U patent/CN201689072U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507246A (en) * | 2018-11-26 | 2019-03-22 | 江苏威尔安智能科技有限公司 | Oxygen content detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101229 |
|
| CX01 | Expiry of patent term |