CN101661014A - Residual sample gas cleaning device of electrochemical gas sensor and gas detecting device using same - Google Patents
Residual sample gas cleaning device of electrochemical gas sensor and gas detecting device using same Download PDFInfo
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- CN101661014A CN101661014A CN200910180220A CN200910180220A CN101661014A CN 101661014 A CN101661014 A CN 101661014A CN 200910180220 A CN200910180220 A CN 200910180220A CN 200910180220 A CN200910180220 A CN 200910180220A CN 101661014 A CN101661014 A CN 101661014A
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Abstract
The invention provides a residual sample gas cleaning device of an electrochemical gas sensor, which comprises a filter, a mini-pump, a buffering air chamber and an electromagnetic valve, wherein after being filtered by the filter, the air is pumped into the buffering air chamber by the mini-pump and then enters a sample gas circuit a detecting device of the electrochemical gas sensor through theelectromagnetic valve. As the normally closed electromagnetic valve is arranged inside the sample gas circuit of the electrochemical gas sensor to control the conductive residual sample gas cleaning device, the clean air is pumped into the sample gas circuit by the mini-pump after the measurement at every time, the sample gas in the gas circuit and the air chamber can be successfully discharged after the measurement, no absorbed gas is not available in the gas circuit, no residual sample gas is not available in the air chamber, the measuring accuracy of the electrochemical gas sensor can be improved to the utmost extent, and the service life thereof is comparatively prolonged. The invention also provides an electrochemical gas sensor gas detecting device of the residual sample gas cleaningdevice.
Description
Technical field
The present invention relates to a kind of servicing unit of electrochemical gas sensor, be specifically related to a kind of electrochemical gas sensor residual sample gas scavenge unit and adopt the gas detection equipment of this device.
Background technology
Electrochemical sensor the earliest can be traced back to the 1950's, is used for oxygen monitoring at that time.To 20th century the mid-80, the small electrical chemical sensor begins to be used to detect the interior multiple different toxic gases of PEL scope, and has demonstrated good sensitivity and selectivity.At present, for the purpose of the protection personal safety, various electrochemical sensors are widely used in many static state and mobile application scenario.
Electrochemical sensor comes work by the electric signal that reacts with object gas and generation is directly proportional with gas concentration.Typical electrochemical sensor is made up of sensing electrode (or working electrode) and counter electrode, and is separated by a thin electrolyte layers.Gas at first reacts by small perforate of hollow billet type and sensor, is the hydrophobic barrier then, finally arrives electrode surface.Adopt this method can allow proper amount of gas and sensing electrode to react,, prevent that simultaneously electrolyte from spilling sensor to form sufficient electric signal.
The gas and the sensing electrode that pass the barrier diffusion react, and sensing electrode can adopt oxidation mechanism or reduction mechanism.These reactions are carried out catalysis by the electrode material that designs at object gas.By the resistor that connects between electrode, the electric current that is directly proportional with object gas concentration can flow between positive pole and negative pole.Measure this electric current and can determine gas concentration.Because can produce electric current in this process, electrochemical sensor often is called as electric current gas sensor or micro fuel cell again.
Chinese patent application CN200810009540.0 discloses a kind of electrochemical gas sensor, it comprises setting gas sensing electrode and counter electrode in the enclosure, described shell has the opening that gas is entered, the zone that described gas sensing electrode and counter electrode are contained electrolytic solution separates, and the mechanism that is used for gas sensing electrode and counter electrode are connected to sensing circuit.The electrolytic solution absorber element is set at the inboard of described opening, between shell and gas sensing electrode, to absorb the electrolytic solution by gas sensing electrode, keeps the gas passage by described electrolytic solution absorber element simultaneously.
The diffusion type structural design is all adopted in the gas exchange chamber of electrochemical gas sensor, and the mode of diffusion can cause gas hold-up at air chamber, and in twice adjacent measurement, the residual of sample gas can disturb the measurement result of variable concentrations sample gas for the second time for the first time so.The material surface of whole sampling system path has suction-operated to active gas simultaneously, in a single day gas be absorbed, when next time sample air-flow through the time, absorbed gas enters in the air-flow with regard to desorption, so also can influence measurement accuracy next time, plurality of target gas especially be arranged in mixed gas and use under the simultaneously-measured situation of a plurality of electrochemical sensors even more serious.In addition, basic identical because of the ambient pressure of air chamber and outlet end, sample gas depends on the naturally osmotic of outside air and air chamber sample gas from the discharge of air chamber, and residual sample gas efflux velocity slowly also can't be got rid of simultaneously clean fully.Sample gas remains in the serviceable life that can shorten electrochemical sensor in the air chamber that electrochemical sensor is housed.
Summary of the invention
In view of this, in order to overcome the residual problem that influences measurement accuracy of gas exchange chamber sample gas of present electrochemical gas sensor, the utility model provides the residual sample gas of a kind of electrochemical gas sensor scavenge unit, can be installed in the sample gas gas circuit of existing electrochemical gas sensor, discharge the sample gas of gas circuit and air chamber, cleaning gas production system guarantees that gas circuit do not have adsorbed gas, air chamber noresidue sample gas, improves the measurement accuracy of electrochemical sensor to greatest extent and increases the service life relatively.
Another object of the present invention is to provide the electrochemical sensor gas detection equipment that adopts above-mentioned residual sample gas scavenge unit.
The residual sample gas of a kind of electrochemical gas sensor provided by the invention scavenge unit, it comprises filtrator, minipump and solenoid valve, pump by minipump through the filter filtered air, through the sample gas gas circuit that solenoid valve enters electrochemical gas sensor, described solenoid valve is a normally closed solenoid valve.
The present invention is by being provided with the residual sample gas scavenge unit by normally closed solenoid valve control conducting in the sample gas gas circuit of electrochemical gas sensor, after each measurement finishes, clean air is pumped into by minipump in the sample gas gas circuit, successful realization electrochemical gas sensor is each measures in the back gas circuit that finishes and extraneous pressure differential, discharge the sample gas of gas circuit and air chamber, the cleaning air-channel system, guaranteeing does not have adsorbed gas, air chamber noresidue sample gas in the gas circuit, has improved the measurement accuracy of electrochemical sensor to greatest extent and has prolonged serviceable life.
Further, the described air that is pumped by minipump enters the buffering air chamber, and after buffering air chamber buffering, through the sample gas gas circuit that solenoid valve enters electrochemical gas sensor, the endpiece of described buffering air chamber is provided with reduction valve.
Because what minipump was commonly used all is the diaphragm pump type, can produce air pulse, so at the exhaust end of minipump the buffering air chamber is set, eliminate pulse, and the pressurized air of formation certain pressure, help the discharge of sample gas in the gas circuit, and reduce the loss of pulse sensor.
Further, the air that flows out from described buffering air chamber enters the sample gas gas circuit of electrochemical gas sensor through solenoid valve behind macromolecule membrane type exsiccator.
The polymeric hollow barrier film steam that supplies water only sees through in the described macromolecule membrane type exsiccator, and when wet pressurized air entered hollow membrane, a large amount of water vapor just passed barrier film and taken to outside the device by the small amount of compression air, output be dry air.Because of the hollow membrane outside always is in low steam partial pressure state,, do not need to be provided with water trap so can constantly dehumidify.
Further, described minipump and described solenoid valve are installed on the gas circuit matrix.
The present invention is installed in minipump and solenoid electric valve on the gas circuit matrix, the buffering air chamber is put on the side, simple in structure, compact appearance, by the control operation of apparatus control system, can realize well the residual sample gas of electrochemical sensor gas detection equipment is removed to minipump and solenoid valve.
Further, described minipump, solenoid valve and described buffering air chamber are installed on the gas circuit matrix.She Ji apparatus structure will be more compact like this.
The electrochemical sensor gas detection equipment of the above-mentioned residual sample gas scavenge unit of employing provided by the invention, it comprises sample gas gas circuit inlet end, electrochemical sensor module, sample gas gas circuit exhaust end, electronic flow-meter, power supply input, electric battery and charger, master control borad, LCD and by the electrochemical gas sensor residual sample gas scavenge unit of normally closed solenoid valve control with the conducting of sample gas gas circuit inlet end, described master control borad is controlled the conducting of described solenoid valve and the running of described minipump.
Beneficial effect of the present invention is:
1. the present invention is by being provided with the residual sample gas scavenge unit by normally closed solenoid valve control conducting in the sample gas gas circuit of electrochemical gas sensor, each measure the clean air behind the filtrator elimination dust to be pumped into by minipump in the sample gas gas circuit after finishing (at the exhaust end of minipump the buffering air chamber is set and eliminates pulse, remove airborne water vapor through macromolecule membrane type exsiccator, form the air of dry cleansing with this), the cleaning air-channel system, guaranteeing does not have adsorbed gas in the gas circuit, it is residual that air chamber does not have sample gas, and the measurement accuracy that has improved electrochemical sensor to greatest extent also increases the service life relatively.
2. apparatus of the present invention carry out air becoming pure air after the processing such as meticulous dust filtration, water vapor removing, and the gas production system that is allowed for access in order to avoid pollute electrochemical sensor, causes extra infringement.Air in the employing physical environment does not need other high-purity gas as source of the gas, and is practical and convenient, and excellent economy is arranged.
3. minipump and solenoid electric valve all are installed on the gas circuit matrix, and the buffering air chamber is put on the side, and is simple in structure, compact appearance.
Description of drawings
The residual sample gas of Fig. 1 electrochemical gas sensor of the present invention scavenge unit synoptic diagram
The electrochemical sensor gas detection equipment of the above-mentioned residual sample gas scavenge unit of Fig. 2 employing provided by the invention
Wherein, 1-solenoid valve, 2-gas circuit matrix, the 3-filtrator, the 4-minipump, 5-cushions air chamber, the 6-instrument air dryer, 7-sample gas gas circuit inlet end, the residual sample gas of 8-electrochemical sensor scavenge unit, 9-electrochemical sensor module, the input of 10-power supply, 11-sample gas gas circuit exhaust end, the 12-electronic flow-meter, 13-electric battery and charger, 14-master control borad, the 15-switch, the 16-LCD.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail, preferred embodiment is only in order to illustrate the present invention, rather than in order to limit protection scope of the present invention.
The residual sample gas of a kind of electrochemical gas sensor scavenge unit is made up of filtrator 3, minipump 4, buffering air chamber 5, gas circuit matrix 2 and solenoid valve 1, and described minipump 4 and described solenoid valve 1 are installed on the gas circuit matrix 2.Described solenoid valve is a normally closed solenoid valve, after electrochemical gas sensor is measured end at every turn, solenoid valve is opened, the minipump running, air enters minipump 4 through filter 3, the air that is pumped by minipump 4 enters buffering air chamber 5, and the endpiece of described buffering air chamber 5 is provided with reduction valve, and air forms the pressurized air of certain pressure in the buffering air chamber.Air from described buffering air chamber 5 outflows, enter the sample gas gas circuit of electrochemical gas sensor through solenoid valve 1, form in the gas circuit and extraneous pressure differential, discharge the sample gas of gas circuit and air chamber, the cleaning air-channel system, guarantee not have adsorbed gas in the gas circuit, that air chamber does not have sample gas is residual, improve the measurement accuracy of electrochemical sensor to greatest extent and increase the service life relatively.
The filtrator filtering material adopts stainless steel powder metallurgy material, and pore size filter is a micron order, can effectively filtering dust in air particle.
Because what minipump was commonly used all is the diaphragm pump type, can produce air pulse, so at the exhaust end of minipump the buffering air chamber is set, eliminate pulse, and the pressurized air of formation certain pressure, help the discharge of sample gas in the gas circuit, and reduce the loss of pulse sensor.
Minipump and solenoid electric valve all are installed on the gas circuit matrix, and the buffering air chamber is put on the side, and is simple in structure, compact appearance.
The residual sample gas of a kind of electrochemical gas sensor scavenge unit, be made up of filtrator 3, minipump 4, buffering air chamber 5, gas circuit matrix 2, macromolecule membrane type instrument air dryer 6 and solenoid valve 1, described minipump 4 and described solenoid valve 1 are installed on the gas circuit matrix 2.Described solenoid valve is a normally closed solenoid valve, after electrochemical gas sensor is measured end at every turn, solenoid valve is opened, the minipump running, air enters minipump 4 through filter 3, the air that is pumped by minipump 4 enters buffering air chamber 5, and the endpiece of described buffering air chamber 5 is provided with reduction valve, and air forms the pressurized air of certain pressure in the buffering air chamber.The air that flows out from described buffering air chamber 5 is behind macromolecule membrane type instrument air dryer 6, enter the sample gas gas circuit of electrochemical gas sensor through solenoid valve 1, form in the gas circuit and extraneous pressure differential, discharge the sample gas of gas circuit and air chamber, the cleaning air-channel system, the dry air of cleaning has been avoided the pollution to electrochemical sensor.
Embodiment 3
Substantially the same manner as Example 1, institute's difference is that the gentle plenum chamber of gas circuit matrix constitutes an integral body.
Embodiment 4
A kind of electrochemical sensor gas detection equipment that adopts the residual sample gas of the present invention scavenge unit, form by sample gas gas circuit inlet end 7, electrochemical sensor module 9, sample gas gas circuit exhaust end 11, electronic flow-meter 12, power supply input 10, electric battery and charger 13, master control borad 14, LCD 16 with by the normally closed solenoid valve control and the residual sample gas of the electrochemical gas sensor scavenge unit 8 of sample gas gas circuit inlet end conducting, described master control borad is controlled the conducting of described solenoid valve 1 and the running of described minipump 4.The residual sample gas of described electrochemical gas sensor scavenge unit 8 is identical with the description among the embodiment 1.
Detect in the process of sample gas at electrochemical gas sensor, closed electromagnetic valve, residual sample gas scavenge unit is not worked.After external power supply was given batteries charging, electric battery just can be given whole checkout equipment power supply.Sample gas enters checkout equipment by inlet end, directly flows to the electrochemical sensor module of back, passes through electronic flow-meter then, at last outside the exhaust end device for transferring.
After measurement finished, the running of master control borad control minipump produced pressurized air, and the solenoid valve of residual sample gas scavenge unit is opened simultaneously.Air enters minipump 4 through filter 3, and the air that is pumped by minipump 4 enters buffering air chamber 5, and the endpiece of described buffering air chamber 5 is provided with reduction valve, and air forms the pressurized air of certain pressure in the buffering air chamber.Through the sample gas gas circuit that solenoid valve 1 enters electrochemical gas sensor, detergent line and electrochemical sensor module are passed through electronic flow-meter then, discharge from exhaust end.All operating process are controlled and are presented on the LCD by master control borad central authorities.
Embodiment 5
Substantially the same manner as Example 4, institute's difference is that the residual sample gas of described electrochemical gas sensor scavenge unit 8 is identical with the description among the embodiment 2.
Although by reference some preferred embodiment of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, can make various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (6)
1. the residual sample gas of electrochemical gas sensor scavenge unit, it is characterized in that, comprise filtrator, minipump and solenoid valve, pump by minipump through the filter filtered air, through the sample gas gas circuit that solenoid valve enters electrochemical gas sensor, described solenoid valve is a normally closed solenoid valve.
2. according to the residual sample gas of the described electrochemical gas sensor of claim 1 scavenge unit, it is characterized in that, the described air that is pumped by minipump enters the buffering air chamber, after buffering air chamber buffering, through the sample gas gas circuit that solenoid valve enters electrochemical gas sensor, the endpiece of described buffering air chamber is provided with reduction valve.
3. according to the residual sample gas of the described electrochemical gas sensor of claim 2 scavenge unit, it is characterized in that the air that flows out from described buffering air chamber enters the sample gas gas circuit of electrochemical gas sensor through solenoid valve behind macromolecule membrane type exsiccator.
4. according to claim 1 or the residual sample gas of 2 described electrochemical gas sensors scavenge unit, it is characterized in that described minipump and described solenoid valve are installed on the gas circuit matrix.
5. according to the residual sample gas of the described electrochemical gas sensor of claim 2 scavenge unit, it is characterized in that described minipump, solenoid valve and described buffering air chamber are installed on the gas circuit matrix.
6. adopt the electrochemical sensor gas detection equipment of the described residual sample gas scavenge unit of claim 1, it is characterized in that, comprise sample gas gas circuit inlet end, electrochemical sensor module, sample gas gas circuit exhaust end, electronic flow-meter, power supply input, electric battery and charger, master control borad, LCD and by the electrochemical gas sensor residual sample gas scavenge unit of normally closed solenoid valve control with the conducting of sample gas gas circuit inlet end, described master control borad is controlled the conducting of described solenoid valve and the running of described minipump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910180220A CN101661014A (en) | 2009-10-09 | 2009-10-09 | Residual sample gas cleaning device of electrochemical gas sensor and gas detecting device using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910180220A CN101661014A (en) | 2009-10-09 | 2009-10-09 | Residual sample gas cleaning device of electrochemical gas sensor and gas detecting device using same |
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| CN101661014A true CN101661014A (en) | 2010-03-03 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018164A (en) * | 2012-12-06 | 2013-04-03 | 深圳市南油诺安电子有限公司 | Automatic cleaning and zero setting system for light ion organic volatile gas detector |
| CN106546595A (en) * | 2016-12-30 | 2017-03-29 | 广州华友明康光电科技有限公司 | Hydrocarbon expiration conjoint analysis system |
| CN108490128A (en) * | 2018-03-21 | 2018-09-04 | 杨斌 | A kind of residual gas remove device |
| CN108593852A (en) * | 2018-05-03 | 2018-09-28 | 佛山市川东磁电股份有限公司 | A kind of gas sensor residual sample gas remove device |
| CN109848134A (en) * | 2019-02-01 | 2019-06-07 | 罗舒 | Intrinsic safety type generator thermal conduction density of hydrogen instrument sensor dedicated cleaner |
| CN111480064A (en) * | 2017-08-18 | 2020-07-31 | 山东诺方电子科技有限公司 | Atmospheric pollutants monitoring facilities |
| CN115452494A (en) * | 2022-11-08 | 2022-12-09 | 深圳市安帕尔科技有限公司 | Gas sampling equipment using method and device and electronic equipment |
| CN116973542A (en) * | 2023-09-21 | 2023-10-31 | 山东道成泰和智能科技有限公司 | High-precision five-in-one gas detector with closable probe area |
-
2009
- 2009-10-09 CN CN200910180220A patent/CN101661014A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018164A (en) * | 2012-12-06 | 2013-04-03 | 深圳市南油诺安电子有限公司 | Automatic cleaning and zero setting system for light ion organic volatile gas detector |
| CN106546595A (en) * | 2016-12-30 | 2017-03-29 | 广州华友明康光电科技有限公司 | Hydrocarbon expiration conjoint analysis system |
| CN111480064A (en) * | 2017-08-18 | 2020-07-31 | 山东诺方电子科技有限公司 | Atmospheric pollutants monitoring facilities |
| CN108490128A (en) * | 2018-03-21 | 2018-09-04 | 杨斌 | A kind of residual gas remove device |
| CN108593852A (en) * | 2018-05-03 | 2018-09-28 | 佛山市川东磁电股份有限公司 | A kind of gas sensor residual sample gas remove device |
| CN109848134A (en) * | 2019-02-01 | 2019-06-07 | 罗舒 | Intrinsic safety type generator thermal conduction density of hydrogen instrument sensor dedicated cleaner |
| CN115452494A (en) * | 2022-11-08 | 2022-12-09 | 深圳市安帕尔科技有限公司 | Gas sampling equipment using method and device and electronic equipment |
| CN116973542A (en) * | 2023-09-21 | 2023-10-31 | 山东道成泰和智能科技有限公司 | High-precision five-in-one gas detector with closable probe area |
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Application publication date: 20100303 |