CN220154268U - Online analyzer for formaldehyde in ambient air - Google Patents
Online analyzer for formaldehyde in ambient air Download PDFInfo
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- CN220154268U CN220154268U CN202321671175.6U CN202321671175U CN220154268U CN 220154268 U CN220154268 U CN 220154268U CN 202321671175 U CN202321671175 U CN 202321671175U CN 220154268 U CN220154268 U CN 220154268U
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- ambient air
- formaldehyde
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000012080 ambient air Substances 0.000 title claims abstract description 38
- 238000010521 absorption reaction Methods 0.000 claims abstract description 98
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 230000007246 mechanism Effects 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 65
- 239000011261 inert gas Substances 0.000 claims abstract description 41
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 28
- 239000012488 sample solution Substances 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims description 34
- 239000000523 sample Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 2
- 239000003570 air Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 238000012864 cross contamination Methods 0.000 abstract description 4
- 230000002452 interceptive effect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000002798 spectrophotometry method Methods 0.000 description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001917 fluorescence detection Methods 0.000 description 1
- 238000002795 fluorescence method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The utility model discloses an on-line analyzer for formaldehyde in ambient air, which is respectively connected with an absorption unit, an absorption liquid quantifying mechanism and a color reagent quantifying mechanism through inert gas sources, can respectively carry out pressure feeding on absorption liquid, a sample solution to be tested and a color reagent by using inert gas, has quick, accurate and no air contact in the liquid feeding process, not only avoids the influence of formaldehyde or other interfering substances existing in the air in a pipeline on the accuracy of a detection result, but also prolongs the quality guarantee period of the reagent, thereby effectively improving the accuracy of the detection result and being well applicable to on-line detection of formaldehyde in ambient air. In addition, the absorption liquid, the sample solution to be detected and the conveying flow path of the color reagent are completely isolated, so that cross contamination is completely avoided, and the accuracy of the detection result is improved.
Description
Technical Field
The utility model relates to the technical field of formaldehyde detection, in particular to an on-line analyzer for formaldehyde in ambient air.
Background
The formaldehyde in the ambient air is detected by adopting an acetylacetone spectrophotometry, the detection limit is higher, and the low concentration detection requirement of the formaldehyde in the ambient air cannot be met, so that the detection limit of the formaldehyde in the ambient air is generally reduced by adopting an ultraviolet fluorescence method in the current ambient air formaldehyde online analyzer, and therefore, the cost of instruments and equipment is increased, and the maintenance difficulty is increased. For example, patent CN109781690a discloses an atmospheric formaldehyde analysis system which adds a bubble removal unit and a fluorescence detection unit on the basis of an acetylacetone spectrophotometry detection system, increasing the cost of the detection equipment. In addition, in the field of indoor environment monitoring, a formaldehyde detection instrument generally adopts a phenol reagent spectrophotometry, and has the advantage of low detection limit, but the reagent of the formaldehyde detection instrument contacts with air in a pipeline in the transmission process, once formaldehyde or other interfering substances exist in the air in the pipeline, the accuracy of a detection result is low, and the quality guarantee period under the low-temperature condition is only 2-3 days because the phenol reagent is low in stability and easy to deteriorate, and once the reagent is deteriorated, the accuracy of the detection result is low, so that the phenol reagent spectrophotometry has certain limitation when being applied to online detection of formaldehyde in the environment air.
Disclosure of Invention
The utility model provides an on-line analyzer for formaldehyde in ambient air, which solves the technical problems of lower accuracy of detection results and short quality guarantee period of reagents of the existing formaldehyde detection instrument adopting a phenol reagent spectrophotometry, so that the formaldehyde detection instrument is applied to continuous on-line detection and is limited.
According to one aspect of the utility model, an on-line analyzer for formaldehyde in ambient air is provided, which comprises a sample gas sampling unit for quantitatively sampling ambient air, an absorption unit for absorbing components to be detected in the sample gas to form a sample solution to be detected, a detection unit for detecting the content of the components to be detected in the sample solution to be detected, an inert gas source for providing inert gas to press and send liquid, an absorption liquid quantitative mechanism for quantitatively storing absorption liquid and a developer quantitative mechanism for quantitatively storing developer, wherein the sample gas sampling unit and the absorption liquid quantitative mechanism are respectively connected with the absorption unit in an on-off manner, the absorption unit and the developer quantitative mechanism are respectively connected with the detection unit in an on-off manner, and the inert gas source is respectively connected with the absorption unit, the absorption liquid quantitative mechanism and the developer quantitative mechanism in an on-off manner.
Further, the sample gas sampling unit comprises a sampling pump for sampling ambient air, a first flow control unit for measuring the flow of the sample gas and a processing unit for preprocessing the sampled ambient air, and the sampling pump, the first flow control unit and the processing unit are arranged on a sampling pipeline of the absorption unit.
Further, the absorption liquid quantifying mechanism is connected with the absorption liquid containing container through a first power pump.
Further, the developer quantifying mechanism is connected with the developer containing container through a second power pump.
Further, the inert gas source is respectively connected with the absorption unit, the absorption liquid quantifying mechanism and the color reagent quantifying mechanism through the flow path control unit, and the inert gas source can be controlled to be communicated with one of the absorption unit, the absorption liquid quantifying mechanism and the color reagent quantifying mechanism only through controlling the working state of the flow path control unit.
Further, a second flow control unit is arranged between the inert gas source and the flow path control unit and used for realizing quantitative conveying of the inert gas.
Further, the detection unit comprises a detection tank, a first liquid inlet and a second liquid inlet are arranged on the cavity of the detection tank, and the first liquid inlet and the second liquid inlet are respectively connected with the absorption unit and the color reagent quantifying mechanism in an on-off mode.
Further, the cavity of the detection cell is obliquely arranged.
Further, the first liquid inlet penetrates into the cavity of the detection tank, and the second liquid inlet is arranged at the bottom of the cavity.
Further, the absorbing liquid quantifying mechanism and the color developing agent quantifying mechanism adopt quantifying rings or quantifying tubes.
The utility model has the following effects:
according to the online analyzer for formaldehyde in the ambient air, which is disclosed by the utility model, the inert gas source is respectively connected with the absorption unit, the absorption liquid quantifying mechanism and the color reagent quantifying mechanism in an on-off manner, so that the inert gas can be utilized to respectively press and convey the absorption liquid, the sample solution to be tested and the color reagent, the liquid inlet process is rapid and accurate, no air contact exists, the influence of formaldehyde or other interfering substances existing in the air in a pipeline on the accuracy of a detection result is avoided, the quality guarantee period of a reagent is prolonged, the accuracy of the detection result is effectively improved, and the online analyzer is well applicable to online detection of formaldehyde in the ambient air. In addition, the absorption liquid, the sample solution to be detected and the conveying flow path of the color reagent are completely isolated, so that cross contamination is completely avoided, and the accuracy of the detection result is improved.
In addition to the objects, features and advantages described above, the present utility model has other objects, features and advantages. The present utility model will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic view of the flow path structure of an ambient air formaldehyde online analyzer according to a preferred embodiment of the present utility model.
Description of the reference numerals
1. A sample gas sampling unit; 2. an absorption unit; 3. a detection unit; 4. an inert gas source; 5. an absorption liquid quantifying mechanism; 6. a color-developer quantifying mechanism; 101. a sampling pump; 102. a first flow control unit; 103. a processing unit; 7. a first power pump; 8. an absorption liquid container; 9. a developer container; 10. a second power pump; 11. a flow path control unit; 12. and a second flow control unit.
Detailed Description
Embodiments of the utility model are described in detail below with reference to the attached drawing figures, but the utility model can be practiced in a number of different ways, as defined and covered below.
It will be appreciated that as shown in fig. 1, a preferred embodiment of the present utility model provides an ambient air formaldehyde online analyzer, which comprises a sample gas sampling unit 1 for performing quantitative sample injection of ambient air, an absorption unit 2 for absorbing a component to be measured in the sample gas to form a sample solution to be measured, a detection unit 3 for detecting the content of the component to be measured in the sample solution to be measured, an inert gas source 4 for providing inert gas to press liquid, an absorption liquid quantifying mechanism 5 for quantitatively storing an absorption liquid, and a developer quantifying mechanism 6 for quantitatively storing a developer, wherein the sample gas sampling unit 1 and the absorption liquid quantifying mechanism 5 are respectively connected with the absorption unit 2 in an on-off manner, the absorption unit 2 and the developer quantifying mechanism 6 are respectively connected with the detection unit 3 in an on-off manner, and the inert gas source 4 is respectively connected with the absorption unit 2, the absorption liquid quantifying mechanism 5, and the developer quantifying mechanism 6 in an on-off manner. Optionally, the absorbing liquid quantifying mechanism 5 and the developer quantifying mechanism 6 adopt quantifying rings or quantifying tubes, so that accurate quantitative extraction of the absorbing liquid and the developer can be realized, and the accuracy of the detection result is improved. Optionally, the inert gas source 4 is further connected with the detecting unit 3 in an on-off manner, and is used for introducing inert gas into the detecting unit 3 so as to uniformly mix the sample solution to be detected with the color developing agent.
It will be understood that the inert gas source 4 is controlled to be connected with the absorption liquid quantifying mechanism 5, the absorption unit 2 is controlled to be connected with the absorption liquid quantifying mechanism 5, the inert gas provided by the inert gas source 4 is used for carrying out pressure feeding on the absorption liquid stored in the absorption liquid quantifying mechanism 5, the absorption liquid is fed into the absorption unit 2, and then the connection between the absorption unit 2 and the absorption liquid quantifying mechanism 5 and the connection between the inert gas source 4 and the absorption liquid quantifying mechanism 5 are disconnected. Then, the sample gas sampling unit 1 is controlled to be connected with the absorption unit 2, after the quantitative sampling of the ambient air is carried out through the sample gas sampling unit 1, the collected sample gas enters the absorption unit 2 to be mixed with the absorption liquid, the component to be detected in the sample gas is absorbed by the absorption liquid to form a sample solution to be detected, and then the connection between the sample gas sampling unit 1 and the absorption unit 2 is disconnected. Then, the absorption unit 2 is controlled to be connected with the detection unit 3, and the inert gas source 4 is connected with the absorption unit 2, the sample solution to be detected in the absorption unit 2 is pumped into the detection unit 3 by using the inert gas, and then the connection between the absorption unit 2 and the detection unit 3 and the connection between the inert gas source 4 and the absorption unit 2 are disconnected. Then, the inert gas source 4 is controlled to be connected with the developer quantifying mechanism 6, and the developer quantifying mechanism 6 is controlled to be connected with the detecting unit 3, the developer stored in the developer quantifying mechanism 6 is pressed into the detecting unit 3 by the inert gas, and then the connection between the inert gas source 4 and the developer quantifying mechanism 6 and the connection between the developer quantifying mechanism 6 and the detecting unit 3 are disconnected. The sample solution to be tested and the color developing agent are fully mixed in the detection unit 3 to complete the color developing reaction, and absorbance is tested through comparison analysis, so that the detection result of formaldehyde concentration in the ambient air is obtained. Optionally, the absorption unit 2 is a low-temperature absorption unit, wherein the temperature of the absorption unit 2 is constant at 2-10 ℃, so that the loss of absorption liquid in the aeration absorption process can be reduced; optionally, the absorption liquid inlet pipe may be disposed in the low-temperature module to pre-cool the absorption liquid, so as to save detection time. In addition, the absorption unit 2 is a conventional absorption tank structure, so the specific structure thereof is not described herein. In addition, the utility model does not relate to method improvement, and the specific detection principle of the spectrophotometry of the phenol reagent belongs to the prior art and is not repeated here. In addition, the detection unit 3 may be electrically connected to the display unit, or may be communicatively connected to a remote platform, so as to implement local display or remote display of the detection result. Optionally, the detection unit 3 includes a heating component to heat the sample solution to be detected, the mixed solution of the sample solution to be detected and the color developer, thereby improving the reaction efficiency. In addition, the on-off connection mode in the utility model is realized by arranging an electric control valve on the connecting pipeline of the two. In addition, before each test is started, the sample gas sampling unit 1 and the absorption unit 2 are cleaned in advance by extracting the sample gas in the time period, so that the influence of the sample gas measured last time on the test is eliminated.
It can be understood that, the on-line analyzer for formaldehyde in ambient air of this embodiment can be connected with the absorption unit 2, the absorption liquid quantifying mechanism 5 and the developer quantifying mechanism 6 respectively through the inert gas source 4, and can utilize inert gas to press and send the absorption liquid, the sample solution to be tested and the developer respectively, and the liquid feeding process is quick, accurate and free from air contact, so that not only is the influence of formaldehyde or other interfering substances existing in the air in the pipeline on the accuracy of the detection result avoided, but also the quality guarantee period of the reagent can be prolonged, thereby effectively improving the accuracy of the detection result, and being well applicable to the on-line detection of formaldehyde in ambient air. In addition, the absorption liquid, the sample solution to be detected and the conveying flow path of the color reagent are completely isolated, so that cross contamination is completely avoided, and the accuracy of the detection result is improved.
The sample gas sampling unit 1 specifically comprises a sampling pump 101 for sampling ambient air, a first flow control unit 102 for measuring the flow of the sample gas, and a processing unit 103 for preprocessing the sampled ambient air, wherein the sampling pump 101, the first flow control unit 102 and the processing unit 103 are arranged on a sampling pipeline of the absorption unit 2. Optionally, the processing unit 103 is arranged on a sampling pipe before the absorption unit 2, and the first flow control unit 102 and the sampling pump 101 are arranged on a sampling pipe before or after the absorption unit 2. After the sampling pump 101 is started, the sample gas firstly passes through the processing unit 103 to remove interference substances such as sulfur dioxide and the like, then enters the absorption unit 2, and the sampled sample gas flow is accurately metered through the first flow control unit 102. Optionally, a special coating is adopted in the sampling pipeline before the absorption unit 2, so that formaldehyde in the sample gas is prevented from being adsorbed on the pipe wall, and the accuracy of the detection result is prevented from being influenced. Among them, the processing unit 103 preferably employs a filter.
The absorption liquid quantifying mechanism 5 is connected to the absorption liquid container 8 by a first power pump 7, and the absorption liquid is quantitatively extracted from the absorption liquid container 8 by the first power pump 7 to the absorption liquid quantifying mechanism 5 for temporary storage. The developer quantifying mechanism 6 is connected with the developer accommodating container 9 through a second power pump 10, and the developer is quantitatively extracted from the developer accommodating container 9 to the developer quantifying mechanism 6 through the second power pump 10 for temporary storage. Alternatively, the first power pump 7 and the second power pump may be peristaltic pumps, plunger pumps, or the like.
Alternatively, the inert gas source 4 is connected with the absorption unit 2, the absorption liquid quantifying mechanism 5 and the developer quantifying mechanism 6 through the flow path control unit 11, and the inert gas source 4 is controlled to be communicated with only one of the absorption unit 2, the absorption liquid quantifying mechanism 5 and the developer quantifying mechanism 6 through controlling the working state of the flow path control unit 11. Wherein, the flow path control unit 11 can be a multi-way valve. Of course, in other embodiments, the inert gas source 4 may be connected to the absorption unit 2, the absorption liquid quantifying mechanism 5 and the developer quantifying mechanism 6 through separate pipelines, and an electric control valve is disposed on each connecting pipeline to control on-off. In addition, a second flow control unit 12 is further disposed between the inert gas source 4 and the flow path control unit 11, for realizing quantitative delivery of inert gas. Wherein the first flow control unit 102 and the second flow control unit 12 preferably employ high precision flow meters.
It can be understood that the detection unit 3 adopts an existing spectrophotometric detection device, and reference may be made to patent CN202974857U filed by the inventor, so that detailed detection principles are not repeated here. The utility model improves on the basis of the existing spectrophotometry detection device, which comprises the following steps: the first liquid inlet and the second liquid inlet are arranged on the cavity of the detection tank and are respectively connected with the absorption unit 2 and the color reagent quantifying mechanism 6 in an on-off mode, so that the color reagent and the sample solution to be detected are separated into liquid, cross contamination of the color reagent and the sample solution to be detected is avoided, and accuracy of detection results is prevented from being influenced due to early reaction of the color reagent and the sample solution to be detected. Wherein, the first liquid inlet is connected with the color developing agent quantitative mechanism 6 in an on-off way, and the second liquid inlet is connected with the absorption unit 2 in an on-off way. In addition, the utility model also inclines the cavity of the detection cell, and the inclination angle is preferably set at 30-70 degrees, so that the detection optical path can be improved, and the detection limit can be further reduced. In addition, the first liquid inlet is arranged on the upper part of the detection tank and is deep into the cavity of the detection tank, so that the color reagent can completely enter the cavity of the detection tank to react with the sample solution to be detected, the influence of the wall hanging of the color reagent on the accuracy of the detection result is avoided, and the second liquid inlet is arranged at the bottom of the cavity and can be used as a liquid outlet, so that the liquid in the detection tank can be conveniently discharged cleanly.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides an ambient air formaldehyde on-line analyzer, its characterized in that includes sample gas sampling unit (1) that is used for carrying out the ration of ambient air and advances, is used for absorbing the absorption unit (2) that awaits measuring the composition in the sample gas in order to form the sample solution that awaits measuring, is used for carrying out the detecting element (3) that awaits measuring the content of composition in the sample solution that awaits measuring, is used for providing inert gas in order to carry out the inert gas source (4) of pressure to the liquid, is used for quantitatively depositing absorbing liquid ration mechanism (5) and is used for quantitatively depositing developer ration mechanism (6) of developer, sample gas sampling unit (1) and absorbing liquid ration mechanism (5) respectively with absorption unit (2) but make-and-break connection, absorption unit (2) and developer ration mechanism (6) respectively with detecting element (3) but make-and-break connection, inert gas source (4) respectively with absorption unit (2), absorbing liquid ration mechanism (5) and developer ration mechanism (6) but make-break-make connection.
2. The on-line analyzer for formaldehyde in ambient air according to claim 1, characterized in that the sample gas sampling unit (1) comprises a sampling pump (101) for sampling ambient air, a first flow control unit (102) for metering the flow of sample gas and a processing unit (103) for preprocessing the sampled ambient air, the sampling pump (101), the first flow control unit (102) and the processing unit (103) being arranged on the sampling pipe of the absorption unit (2).
3. The on-line analyzer for formaldehyde in ambient air according to claim 1, characterized in that said absorption liquid dosing mechanism (5) is connected to an absorption liquid containing vessel (8) by means of a first power pump (7).
4. The on-line analyzer for formaldehyde in ambient air according to claim 1, characterized in that the color-developer quantifying mechanism (6) is connected with the color-developer containing container (9) through a second power pump (10).
5. The online analyzer for formaldehyde in ambient air according to claim 1, wherein the inert gas source (4) is connected to the absorption unit (2), the absorption liquid quantifying mechanism (5) and the developer quantifying mechanism (6) through a flow path control unit (11), and the inert gas source (4) is controlled to be communicated with only one of the absorption unit (2), the absorption liquid quantifying mechanism (5) and the developer quantifying mechanism (6) by controlling the working state of the flow path control unit (11).
6. The online analyzer for formaldehyde in ambient air according to claim 4, wherein a second flow control unit (12) is further provided between the inert gas source (4) and the flow path control unit (11) for realizing quantitative delivery of inert gas.
7. The online analyzer for formaldehyde in the ambient air according to claim 1, wherein the detecting unit (3) comprises a detecting tank, a first liquid inlet and a second liquid inlet are arranged on a cavity of the detecting tank, and the first liquid inlet and the second liquid inlet are respectively connected with the absorbing unit (2) and the color reagent quantifying mechanism (6) in an on-off mode.
8. The ambient air formaldehyde online analyzer of claim 7, wherein the chamber of the detection cell is inclined.
9. The on-line analyzer for formaldehyde in ambient air of claim 7, wherein the first liquid inlet is formed deep into the cavity of the detection cell and the second liquid inlet is formed at the bottom of the cavity.
10. The online analyzer for formaldehyde in ambient air according to claim 1, wherein the absorbing liquid quantifying mechanism (5) and the developer quantifying mechanism (6) are quantitative rings or quantitative tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321671175.6U CN220154268U (en) | 2023-06-28 | 2023-06-28 | Online analyzer for formaldehyde in ambient air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321671175.6U CN220154268U (en) | 2023-06-28 | 2023-06-28 | Online analyzer for formaldehyde in ambient air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220154268U true CN220154268U (en) | 2023-12-08 |
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ID=89010656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321671175.6U Active CN220154268U (en) | 2023-06-28 | 2023-06-28 | Online analyzer for formaldehyde in ambient air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220154268U (en) |
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2023
- 2023-06-28 CN CN202321671175.6U patent/CN220154268U/en active Active
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