CN204882164U - Low concentration particulate matter sampling detection device and device's particulate matter sampling head - Google Patents
Low concentration particulate matter sampling detection device and device's particulate matter sampling head Download PDFInfo
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- CN204882164U CN204882164U CN201520402052.1U CN201520402052U CN204882164U CN 204882164 U CN204882164 U CN 204882164U CN 201520402052 U CN201520402052 U CN 201520402052U CN 204882164 U CN204882164 U CN 204882164U
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Abstract
The utility model discloses a low concentration particulate matter sampling detection device and device's particulate matter sampling head, particulate matter sampling head the first half is double -deck sampling head, and the latter half includes that nonrust steel membrane holds in the palm and the sampling rifle connects, double -deck sampling head inlayer formula endotheca as an organic whole sampling filter core, including sampling pipe, tapered shell, filter membrane and protecting wire net, outer sampling head sheath and the sampling mouth of being, in the sampling head sheath was placed in to integral type endotheca sampling filter core, it was continuous through sampling pipe and sampling mouth foremost, and the rear end is the tapered shell of a handstand, and filter membrane and protecting wire net lie in the open position of tapered shell, utilized the screw thread to utilize O type screw thread gland to press filter membrane, protecting wire net together on nonrust steel membrane holds in the palm integral type endotheca sampling filter core and sampling head sheath sealing connection, last the latter half of particulate matter sampling head, last and sampling rifle articulate. The utility model discloses a sampling operation is complicated among particulate matter sampling detection device and the particulate matter sampling head solution particulate matter volume concentration detection, the accuracy is hanged down, the higher problem of detection limit.
Description
Technical field
The utility model relate to air waste gas monitoring technical field, particularly relate to the particle sampling head of a kind of low concentrations of particulates thing sampling detector for multifunctional and this device.
Background technology
Particle or dirt (ParticulateMatter, Dust), refer to fuel and other materials in burning, synthesis, to decompose and various material produces in mechanical treatment is suspended in solid in emission gases and liquid particles shape material.Fine particle in city carrys out absolutely greatly the artificial pollution such as spontaneous combustion and commercial production.Especially pellet particularly particle diameter be less than 2.5 μm of (PM2.5) parts below, can directly reach human lung and enter alveolar, and blood may be entered towards whole body, the toxic heavy metal of fine particle enriched and harmful organic substance, and Adherent bacteria and virus, pellet 10 μm (PM10) and fine particle (PM2.5) all can produce serious harmful effect to health.
Coal burning, motor-vehicle tail-gas, building operation and dust on the roads and kitchen fumes discharge are the main sources of Atmospheric Grains.For strengthening the discharge management of pollution source, the maximum permission concentration of emission limit value of the particle of pollution source and relevant analysis and testing technology specification have all been formulated in countries in the world.Stationary pollution source particle monitoring is the pollutant index of China's energy-saving and emission-reduction priority control, such as thermal power plant performs GB13223-2011 " fossil-fuel power plant atmospheric pollutant emission standard ", boiler performs GB13271-2014 " emission standard of air pollutants for boilers ", industrial furnace performs GB9078-1996 " industrial furnace atmosphere pollutants emission standards ", cement mill performs GB4915-1996 " Airborne Pollutants from Cement Plant emission standard ", food and beverage enterprise to perform in the GB18483-2001 discharge of pollutant sources standard such as " cooking fume emission standard " and has all made clear and definite limit value regulation to the highest permission concentration of emission of particle or drainage rate.
Along with environmental management is increasingly strict and environmental pollution treatment technology constantly progress, the gentle ability of particle water prevention of all kinds of pollution source is significantly improved, the efficiency of dust collection of cleaner improves gradually, and the discharge quality concentration of coal-fired class pollution source gas exhaust duct endoparticle thing can lower than 30 milligrams of/cubic metre (mg/m
3), power plant more than great majority 300,000 kilowatt-hours of (kWh) units have employed electric bag composite dedusting technology, out of stock and desulfurization and dedusting technology, and granular material discharged mass concentration has been reduced to about 30mg/m
3, some is even lower than 10mg/m
3.Domestic not relevant low concentrations of particulates thing sampling and measuring technology at present, causes part new standard to formulate low concentration emission limit and is difficult to effectively be performed, and creates harmful effect to China's Atmospheric Particulate Matter control.
Such as, Chinese patent CN204255701U discloses a kind of particle sampling filter cylinder clamp device, as shown in Figure 1, this device comprises filter cylinder mounting pipe 4, filter cylinder 5 is installed in filter cylinder mounting pipe 4, one end of filter cylinder mounting pipe 4 is connected with sampling elbow 2 by Connection Block 3, and the other end of filter cylinder mounting pipe 4 is the hydraucone 6 that can be connected with sampling gun.This patent is direct after sampling weighs to particle sampling filter cylinder clamp device entirety, and the weight then before and after contrast sampling can obtain gathered particle weight accurately, and and then calculate the concentration of particle; This device entirety adopts titanium alloy material to make.Reduce spot sampling error, improve the accurate rate of particle sampling, and for low concentration and ultralow super low concentration particle collection effect better.But there is following shortcoming in this particle sampling filter cylinder clamp device:
1) for ensureing test accuracy, the overall titanium alloy material that adopts is made, and manufacturing cost is high, and difficulty is large;
2) mouth of sampling all needs cleaning operation with sampling bend pipe in each measurement, and cleaning operation is complicated, wastes time and energy;
3) under complicated flue gas condition, cannot avoid particle or other pollute in the absorption of outside surface, corrosion, still need in test process to clean outside surface;
4) sampling bend pipe inside surface before on-the-spot test needs carefully to clean filter cylinder also collects washings, is transferred to special measuring cup, the quality of the particle after dry in weighing washings, and is counted particle concentration behind laboratory.Laboratory operation complicated and the manpower of at substantial, the energy.
Therefore, be necessary to design a kind of particle sampling pick-up unit, solve the problem that in particle quality Concentration Testing, sampling operation is complicated, accuracy is low, detection limit is higher.
Utility model content
Many aspects of the present utility model are the particle sampling head providing a kind of low concentrations of particulates thing sampling detector for multifunctional and this device, solve the problem that in particle quality Concentration Testing, sampling operation is complicated, accuracy is low, detection limit is higher.
One side of the present utility model provides a kind of particle sampling head, and described particle sampling head is divided into upper and lower two parts, and the first half is two-layer sampling head, and the latter half comprises stainless steel membrane holder and sampling gun joint, the internal layer of described two-layer sampling head is integral type inner sleeve sampling filter core, and described integral type inner sleeve sampling filter core mainly comprises sampling pipe, tapered shell, filter membrane and protecting wire net, and the skin of described two-layer sampling head is sampling head sheath and sampling mouth, described integral type inner sleeve sampling filter core is placed in described sampling head sheath, described integral type inner sleeve sampling filter core is connected with sampling mouth foremost by sampling pipe, described integral type inner sleeve sampling filter core rear end is the described tapered shell of a handstand, described filter membrane and protecting wire net are positioned at the aperture position of described tapered shell, screw thread is utilized integral type inner sleeve sampling filter core and described sampling head sheath to be tightly connected, described particle sampling head upper, the latter half utilizes O type screw thread gland by described filter membrane, protecting wire net is pressed in described stainless steel membrane holder together, realization is tightly connected, finally whole described particle sampling head is connected with described sampling gun joint.
Preferably, the external diameter of described particle sampling head is less than or equal to 70 millimeters (mm).
Preferably, described filter membrane diameter range is Φ 60 millimeters (mm) to Φ 25 millimeters (mm).
Preferably, described sampling head sheath is made up of stainless steel material or teflon.
Preferably, the filter core main material of described integral type inner sleeve sampling filter core is that lightweight ultra-thin materials is made, and comprises the heat resistant plastices such as teflon or aluminium alloy.
Preferably, the sampling pipe connecting described sampling mouth extends more than 6mm in the described conical shell of integral type inner sleeve sampling filter core.
Another aspect of the present utility model also provides a kind of low concentrations of particulates thing sampling detector for multifunctional, comprise and connect sealing adaptor soon, sampling gun, main control system, temperature sensor, pitot tube current meter, thermometer and as described in claim 1-6 any one particle sampling head, described particle sampling head connects by described the side foremost that sealing adaptor is installed on described sampling gun soon, described temperature sensor and described pitot tube current meter are positioned at the opposite side foremost of described sampling gun, by described sampling gun by described particle sampling head, described temperature sensor and described pitot tube pressure tap assembling position are comparatively near and interference is less and together be positioned in described chimney or flue, described temperature sensor and described pitot tube current meter are respectively used to temperature and waste gas flow velocity in chimney described in Real-Time Monitoring or flue.
Preferably, when described particle sampling head, described temperature sensor and described pitot tube current meter are positioned in described chimney or flue, described particle sampling head just to air-flow so that on the inside surface that is adsorbed on the integrated inner sleeve sampling filter core of described particle sampling head of the particle in air-flow or filter membrane.
Low concentrations of particulates thing sampling detector for multifunctional provided by the utility model is a kind of double-layer nested filter membrane sampling device, and internal layer is integral type inner sleeve sampling filter core, has lightweight, wield feature; Skin is a sampling head sheath, sampling apparatus is made to be applicable to the severe environmental conditions of high temperature, high humidity, high flow rate, the utility model simplifies the operating process that pollution source particle quality concentration field detects, the inside and outside surface of the sampling apparatus cleaned without the need to using high purity chemical reagents, decrease particle sampling test error source, the accuracy that improve and precision, reduce detection limit, solves the problem that low concentrations of particulates substrate concentration is difficult to accurately test.Compared with prior art, the utility model has the advantages such as applied widely, No clean, test be accurate, easy and simple to handle.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of particle sampling filter cylinder clamp device in prior art;
Fig. 2 is the structural representation of a kind of low concentrations of particulates thing sampling detector for multifunctional of the utility model one embodiment;
Fig. 3 is the structural representation of a kind of particle sampling head of another embodiment of the utility model.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 2, a kind of structural representation of particle sampling pick-up unit disclosed in the utility model one embodiment, the particle sampling pick-up unit of the present embodiment is particle test sampling apparatus in the exhaust of a kind of new stationary source, and this particle sampling pick-up unit comprises double-layer nested sampling head 21, connects sealing adaptor 22, sampling gun 23, main control system 26, temperature sensor 27, pitot tube current meter 28 and thermometer 20 soon.
Wherein, described double-layer nested sampling head 21 connects by described the side foremost that sealing adaptor 22 is installed on described sampling gun 23 soon, described temperature sensor 27 and described pitot tube current meter 28 near together with or separately and be positioned at the opposite side foremost of described sampling gun 23, by described sampling gun 23 by described double-layer nested sampling head 21, described temperature sensor 27 and described pitot tube current meter 28 pressure tap assembling position are comparatively near and interference is less and together be positioned in described chimney or flue 29.Be the thieff hatch 24 of hollow in the middle of described sampling gun 23, described thieff hatch 24 is also communicated with sampling pipe 25, and described sampling pipe 25 is communicated with chimney by described thieff hatch 24 or flue 29 is inner.Described temperature sensor 27 is connected with a thermometer 20, and described thermometer 20 is positioned at described sampling gun 23 and is exposed to part outside described chimney or flue 29.
Temperature and waste gas flow velocity in chimney described in Real-Time Monitoring or flue 29 distinguished by described temperature sensor 27 in the present embodiment and described pitot tube current meter 28, described main control system 26 utilizes vacuum pump to produce negative pressure, at described sampling pipe 25 position, utilize flowmeter survey gas flow, utilize solenoid control gas flow to realize isokinetic sampling.
In another embodiment of the present utility model, a kind of particle sampling head is also disclosed, described particle sampling head is a kind of double-layer nested sampling head 21, and its inner structure is concrete as shown in Figure 3, and described double-layer nested sampling head 21 comprises: two-layer sampling head, stainless steel membrane holder 38 and sampling gun joint 39.
Described double-layer nested sampling head 21 is divided into upper and lower two parts, the first half is described two-layer sampling head, the latter half comprises described stainless steel membrane holder 38 and described sampling gun joint 39, the internal layer of described two-layer sampling head is integral type inner sleeve sampling filter core 33, mainly comprises sampling pipe 25, tapered shell 34, filter membrane 36 and protecting wire net 37.The external diameter of described double-layer nested sampling head 21 is less than or equal to 70 millimeters (mm), described filter membrane 36 diameter range is Φ 60 millimeters (mm) to Φ 25 millimeters (mm), for collecting and particle in filtering exhaust, main Types is glass fiber filter, teflon membrane filter or quartz filter, can require to select according to sampling pollutant.Described integral type inner sleeve sampling filter core 33, gross mass is not more than 15 grams (g), and filter core main material adopts lightweight ultra-thin materials to make, and is mainly teflon, plastics or aluminium alloy.The skin of described two-layer sampling head is sampling head sheath 32 and sampling mouth 31, and described integral type inner sleeve sampling filter core is connected with sampling mouth 31 foremost by sampling pipe 25.Described sampling head sheath 32 1 aspect is used for protecting high temperature, high humidity, high flow rate to the impact of integral type particle filter core and destruction; On the other hand for preventing absorption and the pollution of the outside surface of integral type inner sleeve sampling filter core 33, without the need to carrying out cleaning of outer surface, described sampling head sheath 32 is made up of stainless steel or teflon.
Leak for preventing particle, the sampling pipe connecting described sampling mouth 31 extends more than 6mm in the described conical shell of integral type inner sleeve sampling filter core, object prevents from gathering particle to tilt because of filter core, be inverted and reveal from thief hatch or drop, and ensures the accuracy of test.
Described integral type inner sleeve sampling filter core 33 is placed in described sampling head sheath 32, described sampling mouth 31 is positioned at described integral type inner sleeve sampling filter core 33 foremost, described integral type inner sleeve sampling filter core 33 rear end is the described tapered shell 34 of a handstand, described filter membrane 36 and protecting wire net 37 are positioned at the aperture position of described tapered shell 34, screw thread is utilized to be tightly connected with sampling head sheath 32 by integral type inner sleeve sampling filter core 33, described double-layer nested sampling head 21 upper, the latter half utilizes O type screw thread gland 35 by described filter membrane 36, protecting wire net 37 together compacting in described stainless steel membrane holder 38, realization is tightly connected, finally whole described double-layer nested sampling head 21 is connected with sampling gun joint 39.
Described double-layer nested sampling head 21, described temperature sensor 27 and described pitot tube current meter 28 pressure tap assembling position are comparatively near and interference is less and together with when being positioned in described chimney or flue 29, described double-layer nested sampling head 21 is just to air-flow, on the inside surface that particle in air-flow is adsorbed on the integrated inner sleeve sampling filter core 33 of described double-layer nested sampling head 21 or filter membrane 36, by balance measurement lightweight sampling mouth 31 and described double-layer nested sampling head 21 filter cylinder sampling before and after of poor quality, the mass concentration of particle in waste gas is calculated divided by sample gas volumescope, and utilize outer sampling head sheath 32 to avoid particle or other materials to the absorption of sampling mouth 31 outside surface, be infected with the measuring error caused, be applicable to all kinds of low concentrations of particulates thing, the sampling of sticky particle thing and monitoring, avoiding traditional measurement method utilizes number of chemical reagent to clean, dry, the complicated processes such as drying, it is simple that this sampling apparatus has use, testing cost is low, work efficiency advantages of higher.
In another embodiment of the present utility model, in laboratory or factory, be such as pre-assembled at least two integral type inner sleeve sampling filter cores, after drying constant weight, the blank quality (i.e. net weight) of integral type inner sleeve sampling filter core is weighed respectively with balance, such as the blank quality of first integral type inner sleeve sampling filter core is M11, the blank quality of second integral type inner sleeve sampling filter core is M21, the blank quality of the n-th integral type inner sleeve sampling filter core is Mn1, wherein, n represents the integral type inner sleeve sampling filter core being numbered n, and n be more than or equal to 1 integer, then with plastic sealing bag, all integral type inner sleeve sampling filter cores are sealed in rear loading protection box separately respectively.Before test, first integral type inner sleeve sampling filter core is taken out in sealing bag and puts into described sampling sheath, then by described sampling mouth just to sampling air flow, set sampling flow and volume is V1.After first sample completes, described first integral type inner sleeve sampling filter core is taken out and puts into sealing bag in described sampling sheath, then direct loading in described sampling sheath by second integral type inner sleeve sampling filter core continues to measure, also sampling flow can be set and volume is V1, also respectively different sampling flows and volume can be set to each integral type inner sleeve sampling filter core, for convenience of description, sampling flow and the volume of all integral type inner sleeve sampling filter cores are all set to V1 to the present embodiment.According to sampling request, multiple integral type inner sleeve filter core of sampling can be used to measure, in measuring process, carry out complicated cleaning operation without the need to all integral type inner sleeves sampling sampling head of filter core, sampling pipe.After whole test completes, the integral type inner sleeve sampling filter core after all samplings is taken back laboratory, after dry constant weight, the quality of the sampling of the integral type inner sleeve after sampling filter core is weighed again respectively with balance, described first integral type inner sleeve sampling filter core quality such as after sampling is M12, then according to particle concentration=(M12-M11)/V1 that first integral type inner sleeve sampling filter core records, described second integral type inner sleeve sampling filter core quality after sampling is M22, then according to particle concentration=(M22-M21)/V1 that second integral type inner sleeve sampling filter core records, described n-th integral type inner sleeve sampling filter core quality then after sampling is Mn2, then according to particle concentration=(Mn2-Mn1)/V1 that the n-th integral type inner sleeve sampling filter core records, for improving accuracy, again according to the particle concentration that the integral type inner sleeve sampling filter core after above-mentioned all samplings records, the mean value of count particles substrate concentration.
In sum, described particle sampling pick-up unit, in whole test process, tester carries out the operations such as careful gripping, installation and removal without the need to the filter membrane poor to intensity, do not need to clean particle sampling pick-up unit, a large amount of high purity reagents of cleaning needs are not only saved in test site, and decrease laboratory to the measuring fixed amount of cleaning fluid, drying and weighing operation, save a large amount of cleanings and analytical work amount, substantially increase testing efficiency.
Therefore, the described particle sampling pick-up unit disclosed in the utility model embodiment, tool has the following advantages:
1, described particle sampling pick-up unit is the nested sampling apparatus of double layered cone, integrated inner sleeve sampling filter core nonreactive wind speed in sampling head sheath, the requirement of high temperature resistance equal strength, adopt the manufacture of low-density ultra-thin materials, substantially reduce the weight of sampling filter core, with existing closest to compared with technology, can by integrated inner sleeve sampling filter core weighing component as a whole, within gross mass can be controlled in 15 grams (g), significantly reduce detection limit, improve accuracy and the precision of particle concentration test.
2, integral type inner sleeve sampling filter core can to prevent in waste gas each pollutant to the absorption of sampling apparatus outside surface and pollution, without the need to carrying out inside and outside surface clean; Not only decrease frequent clean work in test site, save a large amount of high purity reagents that cleaning consumes, and decrease laboratory to the measuring fixed amount of cleaning fluid, drying and weighing operation, save a large amount of analytical work amounts, particle concentration is tested simple, substantially increase work efficiency.
3, outer sampling overwrap designs can make sampling apparatus be applicable to the measurement of high temperature, high humidity, high flow rate waste gas.
4, test process No clean, directly contacts or dismounting filter membrane without the need to operating personnel, reduces the experimental operating skill requirement to tester.
5, single use, inner sleeve sampling filter core profile is simple, and be easy to batch micro operations, assembling uses simple, with low cost, single use, and No clean is non-maintaining, reduces particle testing cost.
Last instructions: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (8)
1. a particle sampling head, is characterized in that, described particle sampling head is divided into upper and lower two parts, and the first half is two-layer sampling head, and the latter half comprises stainless steel membrane holder and sampling gun joint, the internal layer of described two-layer sampling head is integral type inner sleeve sampling filter core, and described integral type inner sleeve sampling filter core mainly comprises sampling pipe, tapered shell, filter membrane and protecting wire net, and the skin of described two-layer sampling head is sampling head sheath and sampling mouth, described integral type inner sleeve sampling filter core is placed in described sampling head sheath, described integral type inner sleeve sampling filter core is connected with sampling mouth foremost by sampling pipe, described integral type inner sleeve sampling filter core rear end is the described tapered shell of a handstand, described filter membrane and protecting wire net are positioned at the aperture position of described tapered shell, screw thread is utilized integral type inner sleeve sampling filter core and described sampling head sheath to be tightly connected, described particle sampling head upper, the latter half utilizes O type screw thread gland by described filter membrane, protecting wire net is pressed in described stainless steel membrane holder together, realization is tightly connected, finally whole described particle sampling head is connected with described sampling gun joint.
2. particle sampling head as claimed in claim 1, it is characterized in that, the external diameter of described particle sampling head is less than or equal to 70 millimeters of mm.
3. particle sampling head as claimed in claim 1, it is characterized in that, described filter membrane diameter range is Φ 60 millimeters of mm to Φ 25 millimeters of mm.
4. particle sampling head as claimed in claim 1, it is characterized in that, described sampling head sheath is made up of stainless steel material or teflon.
5. particle sampling head as claimed in claim 1, is characterized in that, the filter core main material of described integral type inner sleeve sampling filter core is that lightweight ultra-thin materials is made, and comprises teflon, plastics or aluminium alloy.
6. particle sampling head as claimed in claim 1, is characterized in that, the sampling pipe connecting described sampling mouth extends more than 6mm in the described conical shell of integral type inner sleeve sampling filter core.
7. a low concentrations of particulates thing sampling detector for multifunctional, it is characterized in that, comprise and connect sealing adaptor soon, sampling gun, main control system, temperature sensor, pitot tube current meter, thermometer and as described in claim 1-6 any one particle sampling head, described particle sampling head connects by described the side foremost that sealing adaptor is installed on described sampling gun soon, described temperature sensor and described pitot tube current meter are positioned at the opposite side foremost of described sampling gun, by described sampling gun by described particle sampling head, described temperature sensor is positioned in described chimney or flue together with described pitot tube pressure tap assembling position, described temperature sensor and described pitot tube current meter are respectively used to temperature and waste gas flow velocity in chimney described in Real-Time Monitoring or flue.
8. device as claimed in claim 7, it is characterized in that, when described particle sampling head, described temperature sensor and described pitot tube current meter are positioned in described chimney or flue, described particle sampling head just to air-flow so that on the inside surface that is adsorbed on the integrated inner sleeve sampling filter core of described particle sampling head of the particle in air-flow or filter membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520402052.1U CN204882164U (en) | 2015-06-11 | 2015-06-11 | Low concentration particulate matter sampling detection device and device's particulate matter sampling head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520402052.1U CN204882164U (en) | 2015-06-11 | 2015-06-11 | Low concentration particulate matter sampling detection device and device's particulate matter sampling head |
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| CN204882164U true CN204882164U (en) | 2015-12-16 |
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| CN201520402052.1U Withdrawn - After Issue CN204882164U (en) | 2015-06-11 | 2015-06-11 | Low concentration particulate matter sampling detection device and device's particulate matter sampling head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913953A (en) * | 2015-06-11 | 2015-09-16 | 北京市环境保护监测中心 | Low-concentration particulate matter sampling detection device and particulate matter sampling head of device |
-
2015
- 2015-06-11 CN CN201520402052.1U patent/CN204882164U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913953A (en) * | 2015-06-11 | 2015-09-16 | 北京市环境保护监测中心 | Low-concentration particulate matter sampling detection device and particulate matter sampling head of device |
| CN104913953B (en) * | 2015-06-11 | 2019-03-19 | 北京市环境保护监测中心 | A kind of particle sampling head of low concentration particulate matter sampling detector for multifunctional and the device |
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Granted publication date: 20151216 Effective date of abandoning: 20190319 |