CN204945074U - A kind of mirror dew point instrument based on the two measuring circuit of two Peltier - Google Patents
A kind of mirror dew point instrument based on the two measuring circuit of two Peltier Download PDFInfo
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- CN204945074U CN204945074U CN201520682230.0U CN201520682230U CN204945074U CN 204945074 U CN204945074 U CN 204945074U CN 201520682230 U CN201520682230 U CN 201520682230U CN 204945074 U CN204945074 U CN 204945074U
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Abstract
The utility model relates to a kind of mirror dew point instrument based on the two measuring circuit of two Peltier; The technical matters solved is: provide a kind of and measure that efficiency is higher, response speed is faster based on the mirror dew point instrument of the two measuring circuit of two Peltier; The technical scheme adopted is: a kind of mirror dew point instrument based on the two measuring circuit of two Peltier, comprise: the first measuring system and the second measuring system, described first measuring system comprises: first analyzes air chamber, the first minute surface, the first refrigeration system, the first temp measuring system, the first cooling system, the first control system and the first photodetector system, and described second measuring system comprises: second analyzes air chamber, the second minute surface, the second refrigeration system, the second temp measuring system, the second cooling system, the second control system and the second photodetector system; The utility model is applicable to dew point hygrometer field.
Description
Technical field
The utility model belongs to the technical field of dew point hygrometer, is specifically related to a kind of mirror dew point instrument based on the two measuring circuit of two Peltier.
Background technology
A lot of industry is to SF
6the measurement of micro-moisture requires very high, such as, for power industry, high-voltage switch gear due to voltage high, the insulativity of needs is just high, once fill the SF in high-voltage switch gear
6gas (for the electric arc that goes out during switch motion) Moisture high UCL is (lower than 150 μ L/L before having electric arc compartment to put into operation, lower than 250 μ L/L before putting into operation without electric arc compartment), the insulating property of meeting impact to voltage switch, cause very large potential safety hazard, therefore high-voltage switch gear needs SF
6the moisture of gas is tested.
In winter, we can see a kind of common phenomenon, because outdoor temperature is lower, indoor more damp and hotter air can condense on glass pane, makes the fuzzy a slice of glass pane, if carefully observe and study down again, if at indoor unlatching dehumidifier, the moisture of indoor is progressively removed, although so outdoor same temperature, and we can find that dew on glass pane can slowly cancellation, glass pane exposes heavily again transparent bright and clean essence; If at this moment outdoor temperature have dropped, when so temperature drops to a certain degree, although dehumidifier has made room air very dry, glass pane still there will be fuzzy cut-layer; This phenomenon explanation, close dew temperature on glass is relevant with the water cut of the ambiance at glass place, further research finds, this relation is one-to-one relationship, an i.e. moisture content value of each close dew temperature (being referred to as dewpoint temperature) corresponding ambiance, dew point can be interpreted as simply and vapour content in gas is reached capacity the temperature of state, is one of mode representing absolute humidity of gas; As can be seen here, dewpoint temperature is a kind of system of units of tolerance moisture in gas content, and dew point hygrometer is exactly the instrument of the absolute water content in measurement gas based on this system of units.
At present, relevant unit and enterprise adopt dew point hygrometer to test SF mostly
6the moisture of gas, on market, the test philosophy of the dew point hygrometer of main flow is mostly based on minute surface method and capacitance-resistance method, adopt the dew point hygrometer measuring accuracy of minute surface method high, stablize, but because its price is high, test speed slowly, be widely used in laboratory and scientific research structure; And adopt the dew point hygrometer of capacitance-resistance method to use 2 years just to need afterwards calibration, be widely used in the such as test site such as grid company, generating plant; But along with the raising required dew point hygrometer measuring accuracy, test site also progressively starts to select mirror dew point instrument.
And for mirror dew point instrument, the design of its refrigeration system seems particularly important, and the refrigeration system of existing mirror dew point instrument is generally adopted in two ways, and one adopts thermoelectric cooling separately, this refrigeration modes is due to refrigeration quantitative limitation, and the speed of measurement is slow; Another kind adds compressor cooling on the basis of thermoelectric cooling, although this refrigeration modes accelerates the efficiency of refrigeration, but due to the employing of compressor, add the power consumption of equipment to a great extent, also the volume of equipment is made to increase a lot, limit the use occasion of instrument, fixedly can only be used in laboratory, can not portable mobile; In addition, test speed improves by adopting the mode of the innovatory algorithm such as fuzzy control in Ye You producer, but this mode is very limited for improving the contribution of measuring response speed.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical matters to be solved is: provide a kind of and measure that efficiency is higher, response speed is faster based on the mirror dew point instrument of the two measuring circuit of two Peltier.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of mirror dew point instrument based on the two measuring circuit of two Peltier, comprise: the first measuring system and the second measuring system, described first measuring system comprises: first analyzes air chamber, first minute surface, first refrigeration system, first temp measuring system, first cooling system, first control system and the first photodetector system, described first minute surface, first refrigeration system and the first temp measuring system are all arranged at described first and analyze in air chamber, described first cooling system is arranged at the bottom that described first analyzes air chamber, described first control system respectively with described first refrigeration system, first temp measuring system and the electrical connection of the first photodetector system, described second measuring system comprises: second analyzes air chamber, the second minute surface, the second refrigeration system, the second temp measuring system, the second cooling system, the second control system and the second photodetector system, described second minute surface, the second refrigeration system and the second temp measuring system are all arranged at described second and analyze in air chamber, described second cooling system is arranged at the bottom that described second analyzes air chamber, and described second control system is electrically connected with described second refrigeration system, the second temp measuring system and the second photodetector system respectively, described first analysis air chamber and described second is analyzed air chamber and is interconnected, and described first analyzes air chamber is provided with air intake opening, and described second analyzes air chamber is provided with gas outlet.
Preferably, described first refrigeration system comprises the first Peltier, and the cold junction of described first Peltier is connected with described first minute surface, and the hot junction of described first Peltier is connected with described first control system; Described second refrigeration system comprises the second Peltier, and the cold junction of described second Peltier is connected with described second minute surface, and the hot junction of described second Peltier is connected with described second control system.
Preferably, described first temp measuring system comprises the first temperature sensor, and described first temperature sensor is arranged on described first minute surface, and the output terminal of described first temperature sensor is connected with the input end of described first control system; Described second temp measuring system comprises the second temperature sensor, and described second temperature sensor is arranged on described second minute surface, and the output terminal of described second temperature sensor is connected with the input end of described second control system.
Preferably, described first photodetector system comprises the first testing circuit, for described first delivery header of the first minute surface utilizing emitted light photograph and the first Receiver for receiving described first specular light, described first delivery header is all connected with described first testing circuit with described first Receiver, and described first testing circuit is connected with described first control system; Described second photodetector system comprises the second testing circuit, for described second delivery header of the second minute surface utilizing emitted light photograph and the second Receiver for receiving described second specular light, described second delivery header is all connected with described second testing circuit with described second Receiver, and described second testing circuit is connected with described second control system.
Preferably, described first cooling system comprises: the first heating radiator carrying out dispelling the heat for giving described first refrigeration system and the first fan for carrying out dispelling the heat to described first heating radiator, described first heating radiator is arranged at the bottom that described first analyzes air chamber, and described first fan is arranged at the bottom of described first heating radiator; Described second cooling system comprises: the second heating radiator carrying out dispelling the heat for giving described second refrigeration system and the second fan for carrying out dispelling the heat to described second heating radiator, described second heating radiator is arranged at the bottom that described second analyzes air chamber, and described second fan is arranged at the bottom of described second heating radiator.
Preferably, described first analysis air chamber and described second analysis air chamber are communicated with by stainless steel tracheae.
The utility model compared with prior art has following beneficial effect: the mirror dew point instrument in the utility model is primarily of the first measuring system and the second measuring system composition, first measuring system comprises: first analyzes air chamber, first minute surface, first refrigeration system, first temp measuring system, first cooling system, first control system and the first photodetector system, second measuring system comprises: second analyzes air chamber, second minute surface, second refrigeration system, second temp measuring system, second cooling system, second control system and the second photodetector system, first analysis air chamber and described second is analyzed air chamber and is interconnected, first analyzes air chamber is provided with air intake opening, second analyzes air chamber is provided with gas outlet, analyze air chamber to be mainly used in constructing a testing environment to each detection part, the moisture that minute surface is mainly used in gas condenses (when the moisture in gas condenses on minute surface, now mirror temperature is the dewpoint temperature of gas), refrigeration system is mainly used in reducing mirror temperature, temp measuring system is mainly used in measuring mirror temperature, cooling system is mainly used in the loose heat except refrigeration system, photodetector system is mainly used in judging condensation degree, control system is mainly used in adjusting refrigeration system according to the testing result of photodetector system and makes condensation process rapid equalisation, during work, to passing in the first analysis air chamber and the second analysis air chamber, the air intake opening analyzed on air chamber by first treats that test sample gas is measured, measure complete waste gas to discharge from the gas outlet the second analysis air chamber, first measuring system is the same with the measuring process of the second measuring system, for the first measuring system: sample air-flow is through the first minute surface, the different temperatures of the first minute surface can cause sample gas to present different condensation states, and the not same gaseity on the first minute surface can cause the first photodetector system to have no output signal, first control system adjusts the refrigeration degree of the first refrigeration system by receiving the different signal of the first photodetector system, and then change the temperature of the first minute surface, the temperature of the first minute surface affects the condensation state of sample gas again, so repeatedly, the condensation state (the first minute surface has drop to separate out) until sample gas reaches capacity, first control system adjusts the first refrigeration system makes cut-layer reach fixed value, the temperature that now the first temp measuring system measures is the dewpoint temperature of sample gas, above-mentioned measuring process also occurs in the second measuring system simultaneously, only the first measuring system and the second measuring system carry out two-way adjustment from the different temperatures value within the scope of measuring tempeature respectively, without the need to carrying out unidirectional adjustment from the maximal value within the scope of measuring tempeature or minimum value as traditional measuring system, substantially increasing and measuring efficiency and response speed.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is a kind of in the utility model structural representation of the embodiment provided based on the mirror dew point instrument of the two measuring circuit of two Peltier;
In figure: 1 is the first measuring system, 2 is the second measuring system, and 3 is the first analysis air chamber, 4 is the first minute surface, 5 is the second analysis air chamber, and 6 is the second minute surface, and 7 is air intake opening, 8 is gas outlet, 9 is the first Peltier, and 10 is the second Peltier, and 11 is the first temperature sensor, 12 is the second temperature sensor, 13 is the first delivery header, and 14 is the first Receiver, and 15 is the second delivery header, 16 is the second Receiver, 17 is the first heating radiator, and 18 is the first fan, and 19 is the second heating radiator, 20 is the second fan, and 21 is stainless steel tracheae.
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 a part of embodiment of the present utility model, 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.
Fig. 1 is a kind of in the utility model structural representation of the embodiment provided based on the mirror dew point instrument of the two measuring circuit of two Peltier, as shown in Figure 1, a kind of mirror dew point instrument based on the two measuring circuit of two Peltier, comprise: the first measuring system 1 and the second measuring system 2, described first measuring system 1 comprises: first analyzes air chamber 3, first minute surface 4, first refrigeration system, first temp measuring system, first cooling system, first control system and the first photodetector system, described first minute surface 4, first refrigeration system and the first temp measuring system are all arranged at described first and analyze in air chamber 3, described first cooling system is arranged at the bottom that described first analyzes air chamber 3, described first control system all with described first refrigeration system, first temp measuring system and the electrical connection of the first photodetector system, described second measuring system 2 comprises: second analyzes air chamber 5, second minute surface 6, second refrigeration system, the second temp measuring system, the second cooling system, the second control system and the second photodetector system, described second minute surface 6, second refrigeration system and the second temp measuring system are all arranged at described second and analyze in air chamber 5, described second cooling system is arranged at the bottom that described second analyzes air chamber 5, and described second control system is all electrically connected with described second refrigeration system, the second temp measuring system and the second photodetector system, described first analysis air chamber 3 and described second is analyzed air chamber 5 and is interconnected, particularly, described first analysis air chamber 3 and described second is analyzed air chamber 5 and is communicated with by stainless steel tracheae 21, described first analyzes air chamber 3 is provided with air intake opening 7, described second analyzes air chamber 5 is provided with gas outlet 8, particularly, the pipeline that described air intake opening 7, described gas outlet 8 are all made by stainless steel material is connected with feeder, gas concentration unit respectively, in the present embodiment, described first analyzes air chamber 3 and described second analyzes the material of air chamber 5 and processes speed and the precision that smooth finish will have influence on measurement, therefore described first analysis air chamber 3 and described second analysis air chamber 5 must adopt stainless steel to make, and their smooth finish will accomplish more than 0.2.
Further, described first refrigeration system can comprise the first Peltier 9, and the cold junction of described first Peltier 9 is connected with described first minute surface 4, and the hot junction of described first Peltier 9 is connected with described first control system; Described second refrigeration system comprises the second Peltier 10, and the cold junction of described second Peltier 10 is connected with described second minute surface 6, and the hot junction of described second Peltier 10 is connected with described second control system.
Further, described first temp measuring system can comprise the first temperature sensor 11, and described first temperature sensor 11 is arranged on described first minute surface 4, and the output terminal of described first temperature sensor 11 is connected with described first control system; Described second temp measuring system comprises the second temperature sensor 12, and described second temperature sensor 12 is arranged on described second minute surface 6, and the output terminal of described second temperature sensor 12 is connected with the input end of described second control system; Particularly, described first temperature sensor 11 and described second temperature sensor 12 can be platinum filament thermal resistance sensor; In the present embodiment, the precision of described first temperature sensor 11 and described second temperature sensor 12 can more than 0.1 DEG C.
Further, described first photodetector system can comprise the first testing circuit, for the first delivery header 13 to described first minute surface 4 utilizing emitted light photograph and the first Receiver 14 for receiving described first minute surface 4 reflected light, described first delivery header 13 is all connected with described first testing circuit with described first Receiver 14, described first testing circuit is connected with described first control system, in the present embodiment, when the sample gas on the first minute surface 4 presents different condensation states, the energy ratio of the reflected light that the utilizing emitted light that the first delivery header 13 sends receives with the first Receiver 14 can be different, first photodetector system carries out dew point judgement according to above-mentioned energy ratio, described second photodetector system comprises the second testing circuit, for the second delivery header 15 to described second minute surface 6 utilizing emitted light photograph and the second Receiver 16 for receiving described second minute surface 6 reflected light, described second delivery header 15 is all connected with described second testing circuit with described second Receiver 16, described second testing circuit is connected with described second control system, particularly, in the present embodiment, when the sample gas on the second minute surface 6 presents different condensation states, the energy ratio of the reflected light that the utilizing emitted light that the second delivery header 15 sends receives with the second Receiver 16 can be different, first photodetector system carries out dew point judgement according to above-mentioned energy ratio.
Further, described first cooling system can comprise: the first heating radiator 17 carrying out dispelling the heat for giving described first refrigeration system and the first fan 18 for carrying out dispelling the heat to described first heating radiator 17, described first heating radiator 17 is arranged at the bottom that described first analyzes air chamber 3, described first fan 18 is arranged at the bottom of described first heating radiator 17, in the present embodiment, described first heating radiator 17 is mainly used in the loose heat except described first Peltier 9 hot junction; Described second cooling system comprises: the second heating radiator 19 carrying out dispelling the heat for giving described second refrigeration system and the second fan 20 for carrying out dispelling the heat to described second heating radiator 19, described second heating radiator 19 is arranged at the bottom that described second analyzes air chamber 5, described second fan 20 is arranged at the bottom of described second heating radiator 19, in the present embodiment, described second heating radiator 19 is mainly used in the loose heat except described second Peltier 10 hot junction.
During work, to passing in the first analysis air chamber 3 and the second analysis air chamber 5, the air intake opening 7 analyzed on air chamber 3 by first treats that test sample gas is measured, measure complete waste gas to discharge from the second gas outlet 8 analyzed air chamber 5, first measuring system 1 is the same with the measuring process of the second measuring system 2, for the first measuring system 1: sample air-flow is through the first minute surface 4, the different temperatures of the first minute surface 4 can cause sample gas to present different condensation states, and the not same gaseity on the first minute surface 4 can cause the first photodetector system to have no output signal, first control system adjusts the refrigeration degree of the first refrigeration system by receiving the different signal of the first photodetector system, and then change the temperature of the first minute surface 4, the temperature of the first minute surface 4 affects the condensation state of sample gas again, so repeatedly, the condensation state (the first minute surface 4 has drop to separate out) until sample gas reaches capacity, first control system adjusts the first refrigeration system makes cut-layer reach fixed value, the temperature that now the first temp measuring system measures is the dewpoint temperature of sample gas, above-mentioned measuring process also occurs in the second measuring system 2 simultaneously, only the first measuring system 1 and the second measuring system 2 carry out two-way adjustment from the different temperatures value within the scope of measuring tempeature respectively, without the need to carrying out unidirectional adjustment from the maximal value within the scope of measuring tempeature or minimum value as traditional measuring system, substantially increasing and measuring efficiency and response speed.
Carry out the process of two-way adjustment from the different temperatures value within the scope of measuring tempeature respectively in the first measuring system 1 and the second measuring system 2, can first by whole measuring tempeature scope quadrisection, for convenience of description, whole measuring tempeature scope can be set to A range, first measuring system 1 can first adjust from 1/2nd places of A range, and the second measuring system 2 can first adjust from 3/4ths places of A range; If sample gas condenses at 1/2nd places of A range, 3/4ths places do not condense, illustrate the dew point temperature value of sample gas be positioned at A range 3/1 to four/2nds between, now the scope between 3/to four/2nds of A range is set to B range, the adjustment temperature of the first measuring system 1 is adjusted to 1/2nd places of B range, the adjustment temperature of the second measuring system 2 is adjusted to 3/4ths places of B range, observes the condensation state of sample gas at this two place; If at 1/2nd places of A range, no condensation, 3/4ths places do not condense sample gas, illustrate that the dew point temperature value of sample gas is positioned between four/tri-to maximal value of A range, now the scope between four/tri-to maximal value of A range is set to C range, the adjustment temperature of the first measuring system 1 is adjusted to 1/2nd places of C range, the adjustment temperature of the second measuring system 2 is adjusted to 3/4ths places of C range, observes the condensation state of sample gas at this two place; If sample gas does not all have condensation at 1/2nd places of A range and 3/4ths places, illustrate that the dew point temperature value of sample gas is between minimum value to two/mono-of A range, now the scope between the minimum value to two of A range/mono-is set to D range, the adjustment temperature of the first measuring system 1 is adjusted to 1/2nd places of D range, the adjustment temperature of the second measuring system 2 is adjusted to 3/4ths places of D range, observes the condensation state of sample gas at this two place; Ceaselessly repeat above-mentioned steps, until the condensation point of the first measuring system 1 and the second measuring system 2 coincides together, the value that now the first temperature sensor 11 and the second temperature sensor 12 record is the dew point temperature value of sample gas.
The utility model overcomes the problem that traditional dew point hygrometer only has a measuring system, have employed two measuring systems, whole mirror dew point instrument is made to have two measuring circuits, " approach " from the spikes/low-points both direction of measuring tempeature scope, and in two measuring circuits, all have employed Peltier freeze, accelerate cooling rate, improve measurement efficiency, there is substantive distinguishing features and progress.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, 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 some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (6)
1. the mirror dew point instrument based on the two measuring circuit of two Peltier, it is characterized in that: comprising: the first measuring system (1) and the second measuring system (2), described first measuring system (1) comprising: first analyzes air chamber (3), first minute surface (4), first refrigeration system, first temp measuring system, first cooling system, first control system and the first photodetector system, described first minute surface (4), first refrigeration system and the first temp measuring system are all arranged at described first and analyze in air chamber (3), described first cooling system is arranged at the bottom that described first analyzes air chamber (3), described first control system respectively with described first refrigeration system, first temp measuring system and the electrical connection of the first photodetector system,
Described second measuring system (2) comprising: second analyzes air chamber (5), second minute surface (6), second refrigeration system, second temp measuring system, second cooling system, second control system and the second photodetector system, described second minute surface (6), second refrigeration system and the second temp measuring system are all arranged at described second and analyze in air chamber (5), described second cooling system is arranged at the bottom that described second analyzes air chamber (5), described second control system respectively with described second refrigeration system, second temp measuring system and the electrical connection of the second photodetector system,
Described first analysis air chamber (3) and described second is analyzed air chamber (5) and is interconnected, described first analyzes air chamber (3) is provided with air intake opening (7), and described second analyzes air chamber (5) is provided with gas outlet (8).
2. a kind of mirror dew point instrument based on the two measuring circuit of two Peltier according to claim 1, it is characterized in that: described first refrigeration system comprises the first Peltier (9), the cold junction of described first Peltier (9) is connected with described first minute surface (4), and the hot junction of described first Peltier (9) is connected with described first control system;
Described second refrigeration system comprises the second Peltier (10), the cold junction of described second Peltier (10) is connected with described second minute surface (6), and the hot junction of described second Peltier (10) is connected with described second control system.
3. a kind of mirror dew point instrument based on the two measuring circuit of two Peltier according to claim 1, it is characterized in that: described first temp measuring system comprises the first temperature sensor (11), described first temperature sensor (11) is arranged on described first minute surface (4), and the output terminal of described first temperature sensor (11) is connected with the input end of described first control system;
Described second temp measuring system comprises the second temperature sensor (12), described second temperature sensor (12) is arranged on described second minute surface (6), and the output terminal of described second temperature sensor (12) is connected with the input end of described second control system.
4. a kind of mirror dew point instrument based on the two measuring circuit of two Peltier according to claim 1, it is characterized in that: described first photodetector system comprises the first testing circuit, for the first delivery header (13) to described first minute surface (4) utilizing emitted light photograph and the first Receiver (14) for receiving described first minute surface (4) reflected light, described first delivery header (13) is all connected with described first testing circuit with described first Receiver (14), and described first testing circuit is connected with described first control system;
Described second photodetector system comprises the second testing circuit, for the second delivery header (15) to described second minute surface (6) utilizing emitted light photograph and the second Receiver (16) for receiving described second minute surface (6) reflected light, described second delivery header (15) is all connected with described second testing circuit with described second Receiver (16), and described second testing circuit is connected with described second control system.
5. a kind of mirror dew point instrument based on the two measuring circuit of two Peltier according to claim 1, it is characterized in that: described first cooling system comprises: for carrying out the first heating radiator (17) of dispelling the heat and the first fan (18) for carrying out dispelling the heat to described first heating radiator (17) to described first refrigeration system, described first heating radiator (17) is arranged at the bottom that described first analyzes air chamber (3), and described first fan (18) is arranged at the bottom of described first heating radiator (17);
Described second cooling system comprises: the second heating radiator (19) carrying out dispelling the heat for giving described second refrigeration system and the second fan (20) for carrying out dispelling the heat to described second heating radiator (19), described second heating radiator (19) is arranged at the bottom that described second analyzes air chamber (5), and described second fan (20) is arranged at the bottom of described second heating radiator (19).
6. a kind of mirror dew point instrument based on the two measuring circuit of two Peltier according to claim 1, is characterized in that: described first analysis air chamber (3) and described second is analyzed air chamber (5) and is communicated with by stainless steel tracheae (21).
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| CN201520682230.0U CN204945074U (en) | 2015-09-06 | 2015-09-06 | A kind of mirror dew point instrument based on the two measuring circuit of two Peltier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268930A (en) * | 2020-12-07 | 2021-01-26 | 广州奥松电子有限公司 | Dew point sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268930A (en) * | 2020-12-07 | 2021-01-26 | 广州奥松电子有限公司 | Dew point sensor |
| CN112268930B (en) * | 2020-12-07 | 2021-04-13 | 广州奥松电子有限公司 | Dew point sensor |
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