CN213689541U - Monitoring device for testing malodorous gas in ambient air - Google Patents
Monitoring device for testing malodorous gas in ambient air Download PDFInfo
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- CN213689541U CN213689541U CN202022433517.3U CN202022433517U CN213689541U CN 213689541 U CN213689541 U CN 213689541U CN 202022433517 U CN202022433517 U CN 202022433517U CN 213689541 U CN213689541 U CN 213689541U
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Abstract
The utility model discloses a monitoring devices for testing foul gas in ambient air, including shell, detecting system, a plurality of first type sensor, MEMS-MOS sensor, walk the gas passageway, first type sensor passes through sensor housing and connects and walk the gas passageway, and sensor housing includes: the sensor comprises a shell, a first sensor mounting hole is arranged on the upper top surface of the shell in a penetrating manner, a first air inlet hole and a first air outlet hole are arranged on the bottom surface of the shell and are respectively communicated with an air outlet channel, a horizontal annular baffle plate is arranged in the shell, the inner wall of the shell is fixedly connected with the outer edge of the annular baffle plate, and the inner diameter of the annular baffle plate is smaller than the diameter of a first sensor; wherein, the vertical height difference between the bottom surface of the shell and the annular baffle is 2-3 mm. The utility model has the advantages of, can guarantee that gaseous and first type sensor fully contact, improve the response sensitivity of first type sensor, and then improve monitoring device's monitoring accuracy nature.
Description
Technical Field
The utility model relates to a foul gas monitoring facilities field. More specifically, the utility model relates to a monitoring devices for testing foul gas in ambient air.
Background
The odor is a gas pollutant which is offensive, harms human health and is more common in indoor and outdoor air. In recent years, discontent emotions and counseling events caused by various abnormal odors have been increasing. In China, on one hand, the production is vigorously developed to meet the requirement of improving the living standard of people, the discharge amount of three wastes is increased, and the problem of malodor becomes increasingly serious; on the other hand, with the improvement of the living standard of people, people are more sensitive to the environment, especially to the pollution caused by the odor, and the odor disturbing events have also occurred frequently, so the research and the monitoring on the odor have attracted the high attention of the government of China, and the odor gas monitor is produced at the same time. In the prior art, a malodorous gas monitor mainly detects a specific gas and a concentration value thereof through a PID sensor or an electrochemical sensor, and then detects a dimensionless odor concentration, namely an OU value of the malodorous gas, through an MEMS-MOS sensor, thereby achieving the purpose of monitoring the malodorous gas in ambient air. In the prior art, after a PID sensor or an electrochemical sensor is installed, sample gas cannot fully contact the surface of the sensor, so that the monitoring precision is poor, and the monitoring effect is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve at least above-mentioned problem to a monitoring devices for testing foul gas in the ambient air is provided, it can ensure that sample gas fully contacts with the sensor, has improved the response sensitivity improvement of sensor for the monitoring, and then has improved the accuracy nature of monitoring.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a monitoring device for detecting malodorous gas in ambient air, comprising a housing, a detection system, a plurality of first type sensors, a MEMS-MOS sensor, a gas passage, the plurality of first type sensors and the MEMS-MOS sensor being electrically connected to the detection system, the plurality of first type sensors and the MEMS-MOS sensor being connected in series to the gas passage, wherein the first type sensors are connected to the gas passage through a sensor housing, the sensor housing comprising:
the sensor comprises a shell, a first sensor mounting hole is arranged on the upper top surface of the shell in a penetrating manner, a first air inlet hole and a first air outlet hole are arranged on the bottom surface of the shell, the first air inlet hole and the first air outlet hole are respectively communicated with an air channel, a horizontal annular baffle plate is arranged in the shell, the inner wall of the shell is fixedly connected with the outer edge of the annular baffle plate, and the inner diameter of the annular baffle plate is smaller than the diameter of the first sensor;
wherein the vertical height difference between the bottom surface of the shell and the annular baffle is 2-3 mm.
Preferably, the MEMS-MOS sensor device further comprises a MEMS-MOS sensor housing, wherein the MEMS-MOS sensor housing is connected with the gas passage in series, and the MEMS-MOS sensor housing comprises: a second sensor mounting hole is arranged on the upper top surface of the second shell in a penetrating manner, a second air inlet hole and a second air outlet hole which are coaxial are arranged on the side wall of the second shell in a penetrating manner, and the second air inlet hole and the second air outlet hole are respectively communicated with the air channel and are respectively positioned on two sides of the MEMS-MOS sensor; the lowest surface of the MEMS-MOS sensor is positioned below the horizontal plane of the vertical lowest point of the second air inlet hole and is not in contact with the bottom surface of the second shell.
Preferably, the number of the MEMS-MOS sensor shells is four, and four MEMS-MOS sensor shells are connected in series through the air passage.
Preferably, a horizontal mounting plate is arranged on the top surface of the first shell, and the mounting plate is fixedly connected with the first type of sensor and used for sealing the first sensor mounting hole.
Preferably, the diameter of the first type of sensor matches the inner diameter of the first sensor mounting hole.
Preferably, the outer wall of the shell is provided with an air outlet hole and an exhaust hole; the air outlet hole is communicated with the first air inlet hole to form a first air passage, and the exhaust hole is communicated with the first air outlet hole to form a second air passage; the first air passage is provided with an internal thread near the air outlet, a coaxial horizontal branch pipe is arranged at the position of the air outlet in a protruding mode, an external thread is arranged on the outer wall of the horizontal branch pipe, and the external thread is matched with the internal thread.
The utility model discloses at least, include following beneficial effect:
first, the utility model discloses a design casing, first sensor mounting hole, first inlet port, first venthole, ring baffle, and design into 2-3mm with the vertical difference in height between the bottom surface of casing and the ring baffle, make and form a narrow and small contact space between the minimum of first type sensor and the bottom surface of casing, when sample gas gets into this contact space from first inlet port like this, the air current can not the loss everywhere, can blow directly first type sensor, reach the purpose of abundant contact, so the response sensitivity and the accuracy of first type sensor have been improved, the accuracy nature of monitoring has been improved on the whole.
Second, the utility model discloses a design second casing, second sensor mounting hole, second inlet port, second venthole, design into the vertical below to the minimum horizontal plane that is located the second inlet port with MEMS-MOS sensor's minimum face moreover, can guide like this that the sample air current passes through MEMS-MOS sensor and fully contacts with MEMS-MOS sensor, improves MEMS-MOS sensor's response sensitivity, and then improves MEMS-MOS sensor's accuracy, improves the accuracy nature that detects.
Third, the utility model discloses a design mounting panel can fix first type sensor, improves the stability of first type sensor.
Fourth, the utility model discloses a with the diameter design of first type sensor with the internal diameter phase-match of first sensor mounting hole, can stabilize install first type sensor in first sensor mounting hole, improved the stability of device.
Fifth, the utility model discloses a gas pocket, exhaust hole, first air flue, second air flue, internal thread, horizontal branch pipe, external screw thread are walked in the design, through with horizontal branch pipe with walk the gas pocket and be close to first air flue department and carry out the spiro union, can realize dismantling of a plurality of sensor shells and connect, can confirm the quantity of first type of sensor according to actual ambient air, have improved the practicality and the application scope of device.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a cross-sectional view of a sensor housing according to one embodiment of the present invention;
fig. 2 is a top view of a sensor housing according to one embodiment of the present invention;
fig. 3 is a cross-sectional view of four MEMS-MOS sensor housings according to one embodiment of the present invention;
fig. 4 is a top view of four MEMS-MOS sensor housings according to one embodiment of the present invention;
fig. 5 is a side view of four MEMS-MOS sensor housings according to one embodiment of the present invention;
fig. 6 is a perspective view of four MEMS-MOS sensor housings according to one embodiment of the present invention;
fig. 7 is a schematic view of the overall structure of the monitoring device for testing malodorous gas in ambient air according to one of the technical solutions of the present invention.
Reference numerals: 1-a shell; 2-air holes are arranged; 3-air exhaust holes; 4-a first mounting hole; 5-an annular baffle; 6-a first type of sensor; 7-horizontal branch pipe; 8-a first air inlet; 9-a first air outlet; 10-internal thread; 11-external thread; 12-MEMS-MOS sensors; 13-a second air intake; 14-a second outlet aperture; 15-MEMS-MOS sensor housing; 16-a second mounting hole; 17-ring-shaped baffle plate; 18-a mounting plate; 19-control the main board; 20-an electromagnetic valve; 21-a fan; 22-an air pump; 23-zero air inlet; 24-sample gas inlet; 25-exhaust outlet.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1-7, the present invention provides a monitoring device for detecting malodorous gas in ambient air, which comprises a housing, a detection system, a plurality of first sensors 6, a MEMS-MOS sensor 12, a gas passage, wherein the plurality of first sensors 6 and the MEMS-MOS sensor 12 are electrically connected to the detection system, the plurality of first sensors 6 and the MEMS-MOS sensor 12 are connected in series to the gas passage, the plurality of first sensors 6 are PID sensors or electrochemical sensors, the electrochemical sensors include a hydrogen sulfide sensor, an ammonia sensor, a sulfur dioxide sensor, etc., and need to be selected according to the actual conditions of the ambient air during the actual operation, wherein the detection system, the first sensors 6, the MEMS-MOS sensor 12, and the gas passage are all structures known to those skilled in the art, A device or product; characterized in that the first type of sensor 6 is connected to the ventilation channel by a sensor housing, the sensor housing comprising:
the sensor comprises a shell 1, wherein the shell 1 is a square shell, a first sensor mounting hole is formed in the upper top surface of the shell in a penetrating mode to form a mounting cavity of a first type sensor 6, a first air inlet hole 8 and a first air outlet hole 9 are formed in the bottom surface of the shell 1, the first air inlet hole 8 and the first air outlet hole 9 are respectively communicated with an air channel, a horizontal annular baffle plate 5 is arranged in the shell 1, the inner wall of the shell 1 is fixedly connected with the outer edge of the annular baffle plate 5, the inner diameter of the annular baffle plate 5 is smaller than the diameter of the first type sensor 6, the first type sensor 6 is convenient to mount, and the upper top surface of the annular baffle plate 5 is abutted to the lowest surface of the first type sensor 6, namely the surface where the air;
wherein the vertical height difference between the bottom surface of the shell 1 and the annular baffle 5 is 2-3 mm; the diameter of the first sensor mounting hole is usually 18-22mm, a narrow space is formed between the bottom surface of the shell 1 and the lowest surface of the first sensor 6, and in the narrow space, sample gas can directly blow the first sensor 6 when flowing through the narrow space, so that the sample gas can be prevented from escaping around and can be directly and fully contacted with the first sensor 6; the four edges of the square shell 1 are respectively provided with a first mounting hole 4 and a pin fixing and sealing hole, a mounting plate 18 is provided with a first fixing hole matched with the first mounting hole 4, the first mounting hole 4 can be a screw hole, pins of the first sensor 6 penetrate through the pin fixing and sealing hole and are fixed in a first sensor shell through the mounting plate 18, and the mounting plate 18 simultaneously seals the first sensor mounting hole;
in the technical scheme, in the using process, the first type sensor 6 is firstly installed in the first sensor installation hole, then the first type sensor 6 is fixed by the installation plate 18, and when sample airflow passes through the sensor shell along the air passing channel and enters a narrow space between the bottom surface of the sensor shell and the lowest surface of the first type sensor 6, the sample airflow directly blows the first type sensor 6, so that the purpose of full contact is achieved;
by adopting the technical scheme, the obtained beneficial effects are that through designing the shell 1, the first sensor mounting hole, the first air inlet hole 8, the first air outlet hole 9 and the annular baffle plate 5, and designing the vertical height difference between the bottom surface of the shell 1 and the annular baffle plate 5 into 2-3mm, a narrow contact space is formed between the lowest surface of the first sensor 6 and the bottom surface of the shell 1, so that when sample gas enters the contact space from the first air inlet hole 8, the air flow can not escape around, the first sensor can be directly blown, the purpose of full contact is achieved, the response sensitivity and the accuracy of the first sensor 6 are improved, and the monitoring accuracy is improved on the whole.
In another technical solution, the sensor further comprises a MEMS-MOS sensor housing 15, the MEMS-MOS sensor housing 15 is connected in series with the gas channel, and the MEMS-MOS sensor housing 15 includes: the second shell is a square shell, a second sensor mounting hole penetrates through the upper top surface of the second shell to form a mounting cavity of the MEMS-MOS sensor 12, a horizontal annular baffle plate 17 is fixedly connected to the inner wall of the mounting cavity along the axial direction and used for embedding the MEMS-MOS sensor, the volume of the mounting cavity is 2-3ml, and sample gas can fully contact the MEMS-MOS sensor when flowing through the mounting cavity along the gas passage; a second air inlet hole 13 and a second air outlet hole 14 which are coaxial are arranged on the side wall of the second shell in a penetrating mode, and the second air inlet hole 13 and the second air outlet hole 14 are respectively communicated with the air channel and are respectively located on two sides of the MEMS-MOS sensor 12; the lowest surface of the MEMS-MOS sensor 12 is positioned below the horizontal plane of the vertical lowest point of the second air inlet hole 13 and is not in contact with the bottom surface of the second shell, and the MEMS-MOS sensor 12 is used for guiding the sample air flow to flow through and be fully contacted with the MEMS-MOS sensor 12;
the upper top surface of the second shell is provided with a second mounting hole 16, the second mounting hole 16 can be a screw hole, a fixing plate is provided with a second fixing hole and an MEMS-MOS sensor sealing hole, the second fixing hole is matched with the second mounting hole and is a screw hole, the MEMS-MOS sensor sealing hole is matched with the diameter of the MEMS-MOS sensor sealing hole, and the MEMS-MOS sensor penetrates through the MEMS-MOS sensor sealing hole and is fixed in the MEMS-MOS sensor shell 15 through the fixing plate;
in the technical scheme, in the using process, the MEMS-MOS sensor 12 is firstly placed in the second sensor mounting hole, then the MEMS-MOS sensor 12 is fixed in the MEMS-MOS sensor shell 15 through the fixing plate, when sample airflow enters from the second air inlet hole 13, the sample airflow can flow through the lowest surface of the MEMS-MOS sensor 12 and fully contact with the lowest surface of the MEMS-MOS sensor 12 because the MEMS-MOS sensor 12 is positioned below the horizontal plane where the lowest vertical point of the second air inlet hole 13 is positioned, and the response sensitivity of the MEMS-MOS sensor 12 is improved;
by adopting the technical scheme, the beneficial effects are that the second shell, the second sensor mounting hole, the second air inlet hole 13 and the second air outlet hole 14 are designed, and the lowest surface of the MEMS-MOS sensor 12 is designed to be positioned below the horizontal plane of the vertical lowest point of the second air inlet hole 13, so that the sample air flow can be guided to pass through the MEMS-MOS sensor 12 and be fully contacted with the MEMS-MOS sensor 12, the response sensitivity of the MEMS-MOS sensor 12 is improved, the accuracy of the MEMS-MOS sensor 12 is further improved, and the monitoring accuracy is improved.
In another technical scheme, the number of the MEMS-MOS sensor shells 15 is four, and the four MEMS-MOS sensor shells 15 are connected in series through the air channels; specifically, four MEMS-MOS sensor shells 15 are fixedly connected together side by side, and the second air inlet holes 13 and the second air outlet holes 14 of two adjacent MEMS-MOS sensor shells 15 are communicated; by adopting the technical scheme, the MEMS-MOS sensor 12 has the beneficial effects that the types are different, the measurable gas range is different, and the number of the MEMS-MOS sensor shells 15 is set to be four, so that the four MEMS-MOS sensors 12 can be connected in series, the measurement range of the gas to be measured is improved, and the monitoring accuracy and the practicability of the device are further improved.
In another technical scheme, a horizontal mounting plate 18 is arranged on the top surface of the first shell 1, the mounting plate 18 is fixedly connected with the first type sensor 6 and used for sealing the first sensor mounting hole, specifically, a first mounting hole 4 is arranged on the shell 1, a first fixing hole and a pin fixing and sealing hole are arranged on the mounting plate 18, the first mounting hole 4 is matched with the first fixing hole and can be a screw hole, the pin of the first type sensor 6 passes through the pin fixing and sealing hole and is fixed in a first sensor shell through the mounting plate 18, and the mounting plate 18 simultaneously seals the first sensor mounting hole; by adopting the technical scheme, the obtained beneficial effects are that the first-class sensor 6 can be fixed by designing the mounting plate 18, and the stability of the first-class sensor 6 is improved.
In another technical scheme, the diameter of the first sensor 6 is matched with the inner diameter of the first sensor mounting hole; by adopting the technical scheme, the obtained beneficial effects are that the first type of sensor 6 can be stably installed in the first sensor mounting hole by designing the diameter of the first type of sensor 6 to be matched with the inner diameter of the first sensor mounting hole, so that the stability of the device is improved.
In another technical scheme, an air passing hole 2 and an air exhaust hole 3 are arranged on the outer wall of the shell 1; the air outlet hole 2 is communicated with the first air inlet hole 8 to form a first air passage, and the air outlet hole 3 is communicated with the first air outlet hole 9 to form a second air passage; an internal thread 10 is arranged at the position, close to the air-passing hole 2, of the first air passage, a coaxial horizontal branch pipe 7 is arranged at the exhaust hole 3 in a protruding mode, an external thread 11 is arranged on the outer wall of the horizontal branch pipe 7, and the external thread 11 is matched with the internal thread 10, so that two adjacent sensor shells can be conveniently connected in a detachable mode in series in a threaded mode; in the technical scheme, in the using process, the number of the first type of sensors is selected according to the actually measured environment gas condition, the number of the sensor shells is consistent with that of the first type of sensors, then a branch pipe on the outer wall of one sensor shell is screwed in an air vent 2 of the other sensor shell, the two sensor shells are detachably connected in series, all the sensor shells are sequentially connected in series according to the mode, then the first type of sensors are sequentially arranged in the sensor shells, and each sensor shell corresponds to one first type of sensor; adopt this technical scheme, the beneficial effect who obtains is, walk gas pocket 2, exhaust hole 3, first air flue, second air flue, internal thread 10, horizontal branch pipe 7, external screw thread 11 through the design, through carrying out the spiro union with horizontal branch pipe 7 with walk that gas pocket 2 is close to first air flue department, can realize the dismantlement of a plurality of sensor shell and connect, can confirm the quantity of first type sensor 6 and monitor according to actual ambient air, improved the practicality and the application scope of device.
In another technical scheme, the monitoring device for testing malodorous gas in ambient air comprises a shell, a detection system, a plurality of first sensors 6, an MEMS-MOS sensor 12, an electromagnetic valve 20, an air pump 22, an air passage and a fan 21; a zero gas inlet 23, a sample gas inlet 24 and a waste gas outlet 25 are arranged on the shell; the gas channel is arranged in the shell 1, an inlet of the gas channel is communicated with the sample gas inlet 24, and an outlet of the gas channel is communicated with the waste gas outlet 25; the air-passing channel is sequentially connected with an electromagnetic valve 20, a plurality of first sensors 6, an MEMS-MOS sensor 12 and an air pump 22 in series along the air-passing direction; one end of an air pipe is communicated with the zero air inlet 23, and the other end of the air pipe is communicated with the electromagnetic valve 20; the fan 21 is arranged on the inner wall of the shell and used for dissipating heat; a control mainboard 19 is further arranged in the shell, and the detection system, the first type sensor 6, the MEMS-MOS sensor 12, the electromagnetic valve 20 and the air pump 22 are in control connection with the control mainboard 19; the control main board 19, the detection system, the first type sensor 6, the MEMS-MOS sensor 12, the electromagnetic valve 20, and the air pump 22 are all well-known structures, devices, or products of those skilled in the art, and preferably, the air pump is a vacuum diaphragm pump; by adopting the technical scheme, the device has the beneficial effects that the type and the concentration of the malodorous gas in the ambient air can be conveniently and accurately measured by designing the shell, the detection system, the plurality of first-type sensors 6, the MEMS-MOS sensor 12, the electromagnetic valve 20, the air pump 22 and the air passage, and the device is accurate in measurement and high in practicability.
In another technical scheme, the monitoring device further comprises a temperature and humidity sensor, wherein the temperature and humidity sensor is arranged in a shell of the monitoring device and is in control connection with the control main board, and the temperature and humidity sensor is of a structure well known by the technical personnel in the field; by adopting the technical scheme, the temperature and humidity sensor has the beneficial effects that the temperature and humidity inside the device can be monitored and temperature and humidity compensation can be carried out by arranging the temperature and humidity sensor, and the accuracy of sensor testing is ensured.
The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. The application, modifications and variations of the monitoring device for testing malodorous gases in ambient air of the present invention will be apparent to those skilled in the art.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (6)
1. A monitoring devices for testing foul gas in ambient air, including shell, detecting system, a plurality of first class sensor, MEMS-MOS sensor, walk the gas passageway, a plurality of first class sensor and MEMS-MOS sensor with detecting system electricity is connected, a plurality of first class sensor and MEMS-MOS sensor establish ties and walk the gas passageway on, characterized in that, first class sensor walks the gas passageway through sensor shell connection, the sensor shell includes:
the sensor comprises a shell, a first sensor mounting hole is arranged on the upper top surface of the shell in a penetrating manner, a first air inlet hole and a first air outlet hole are arranged on the bottom surface of the shell, the first air inlet hole and the first air outlet hole are respectively communicated with an air channel, a horizontal annular baffle plate is arranged in the shell, the inner wall of the shell is fixedly connected with the outer edge of the annular baffle plate, and the inner diameter of the annular baffle plate is smaller than the diameter of the first sensor;
wherein the vertical height difference between the bottom surface of the shell and the annular baffle is 2-3 mm.
2. The monitoring device for testing malodorous gases in ambient air as claimed in claim 1, further comprising a MEMS-MOS sensor housing connected in series with the gas travel channel, the MEMS-MOS sensor housing comprising: a second sensor mounting hole is arranged on the upper top surface of the second shell in a penetrating manner, a second air inlet hole and a second air outlet hole which are coaxial are arranged on the side wall of the second shell in a penetrating manner, and the second air inlet hole and the second air outlet hole are respectively communicated with the air channel and are respectively positioned on two sides of the MEMS-MOS sensor; the lowest surface of the MEMS-MOS sensor is positioned below the horizontal plane of the vertical lowest point of the second air inlet hole and is not in contact with the bottom surface of the second shell.
3. The monitoring device for testing malodorous gases in ambient air as claimed in claim 2, wherein the number of the MEMS-MOS sensor housings is four, and four MEMS-MOS sensor housings are connected in series through the gas passing channel.
4. A monitoring device for testing malodorous gases in ambient air as claimed in claim 1, wherein a horizontal mounting plate is provided on the top surface of the housing, and the mounting plate is fixedly connected to the first type of sensor for closing the first sensor mounting hole.
5. A monitoring device for testing malodorous gases in ambient air as claimed in claim 1, wherein the diameter of the first type of sensor is matched to the inner diameter of the first sensor mounting hole.
6. The monitoring device for testing malodorous gases in ambient air as claimed in claim 1, wherein the outer wall of the shell is provided with air-passing holes and air-discharging holes; the air outlet hole is communicated with the first air inlet hole to form a first air passage, and the exhaust hole is communicated with the first air outlet hole to form a second air passage; the first air passage is provided with an internal thread near the air outlet, a coaxial horizontal branch pipe is arranged at the position of the air outlet in a protruding mode, an external thread is arranged on the outer wall of the horizontal branch pipe, and the external thread is matched with the internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022433517.3U CN213689541U (en) | 2020-10-28 | 2020-10-28 | Monitoring device for testing malodorous gas in ambient air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022433517.3U CN213689541U (en) | 2020-10-28 | 2020-10-28 | Monitoring device for testing malodorous gas in ambient air |
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| CN213689541U true CN213689541U (en) | 2021-07-13 |
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| CN202022433517.3U Active CN213689541U (en) | 2020-10-28 | 2020-10-28 | Monitoring device for testing malodorous gas in ambient air |
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| CN (1) | CN213689541U (en) |
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