CN210221895U - Electrochemical gas sensor - Google Patents
Electrochemical gas sensor Download PDFInfo
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- CN210221895U CN210221895U CN201921200809.3U CN201921200809U CN210221895U CN 210221895 U CN210221895 U CN 210221895U CN 201921200809 U CN201921200809 U CN 201921200809U CN 210221895 U CN210221895 U CN 210221895U
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Abstract
The utility model discloses an electrochemistry gas sensor relates to gas sensor technical field. The gas-liquid separation device comprises a shell, a reference electrode, a counter electrode, a first working electrode and a second working electrode, wherein an accommodating cavity is formed by enclosing the inner wall of the shell, the reference electrode, the counter electrode, the first working electrode and the second working electrode are accommodated in the accommodating cavity, the first working electrode is provided with a first reaction surface attached to the inner wall of the shell, the second working electrode is provided with a second reaction surface attached to the inner wall of the shell, a first capillary hole and a second capillary hole are formed in the shell, one end of the first capillary hole is communicated with the outside, the other end of the first capillary hole is used for guiding outside gas to the first reaction surface, one end of the second capillary hole is communicated with the outside, the other end of the second capillary hole is used for guiding outside gas to the second reaction surface, and the aperture of the first capillary hole is larger than the second. The utility model provides an electrochemistry gas sensor does not receive the environmental impact to can carry out accurate detection to target gas under the condition that has interference gas.
Description
Technical Field
The utility model relates to a gas sensor technical field particularly, relates to an electrochemistry gas sensor.
Background
At present, in the actual use process of commercial electrochemical gas sensors in the market, the response characteristics of the commercial electrochemical gas sensors are greatly influenced by environmental factors such as temperature, humidity and pressure, so that the commercial electrochemical gas sensors are only suitable for industrial detection with low measurement precision.
In addition, in the actual detection process, the sensor is often influenced by other interfering gases, so that the sensor cannot accurately obtain the concentration of the target gas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electrochemistry gas sensor, it can not receive environmental factor's influence to can eliminate interference gas to measuring result's influence.
The utility model provides a technical scheme:
an electrochemical gas sensor comprises a shell, a reference electrode, a counter electrode, a first working electrode and a second working electrode, wherein an accommodating cavity for accommodating electrolyte is enclosed by the inner wall of the shell, the reference electrode, the counter electrode, the first working electrode and the second working electrode are accommodated in the accommodating cavity, a first reaction surface is arranged on one side of the first working electrode, a second reaction surface is arranged on one side of the second working electrode, the first reaction surface and the second reaction surface are respectively attached to the inner wall of the shell, a first capillary hole and a second capillary hole are respectively formed in the shell, one end of the first capillary hole is communicated with the outside, the other end of the first capillary hole is used for guiding outside gas to the first reaction surface, one end of the second capillary hole is communicated with the outside, the other end of the second capillary hole is used for guiding outside gas to the second reaction surface, the pore diameter of the first capillary is larger than the pore diameter of the second capillary.
Further, the inner wall of the shell is respectively provided with a first filter cavity and a second filter cavity at intervals, the first filter cavity and the second filter cavity are used for containing filter materials, the opening of the first filter cavity is sealed by the first reaction surface, the opening of the second filter cavity is sealed by the second reaction surface, the first filter cavity is communicated with the outside through the first capillary holes, and the second filter cavity is communicated with the outside through the second capillary holes.
Furthermore, one end of the first capillary hole is arranged on the end wall of the first filter cavity, which is far away from one end of the first reaction surface, and the other end of the first capillary hole is arranged on the outer wall of the shell.
Furthermore, one end of the second capillary hole is arranged on the end wall of the second filter cavity, which is far away from one end of the second reaction surface, and the other end of the second capillary hole is arranged on the outer wall of the shell.
Further, one end of the first capillary hole is opened on the end wall of the first filter cavity far away from the end of the first reaction surface, the other end of the first capillary hole is opened on the outer wall of the shell, and the two ends of the second capillary hole are respectively opened on the respective cavity walls of the first filter cavity and the second filter cavity which are close to each other.
Furthermore, one end of the second capillary hole is opened on the end wall of the second filter cavity at the end far away from the second reaction surface, the other end of the second capillary hole is opened on the outer wall of the shell, and the two ends of the first capillary hole are respectively opened on the respective cavity walls of the first filter cavity and the second filter cavity which are close to each other.
Further, be provided with the third filter chamber that is used for holding filtering material on the casing, the one end of first capillary is seted up in on the chamber wall of the one end of third filter chamber, the other end of first capillary open with on the inner wall of casing with the position of first reaction surface laminating, the one end of second capillary open in the chamber wall of the one end of third filter chamber, the other end of second capillary open with on the inner wall of casing with the position of first reaction surface laminating, third filter chamber and external intercommunication.
Further, one end of each of the first capillary hole and the second capillary hole is respectively opened on the wall of the same end of the third filter cavity.
Further, the shell is further provided with an air inlet, one end of the air inlet is formed in the cavity wall of one end, far away from the first capillary hole, of the third filter cavity, and the other end of the air inlet is formed in the outer wall of the shell.
Further, the electrochemical gas sensor further comprises a separator, the separator is arranged on the outer wall of the shell and used for separating moisture and dust, and the first capillary hole and the second capillary hole are communicated with the outside through the separator.
Compared with the prior art, the utility model provides an electrochemistry gas sensor, first working electrode and second working electrode are in same electrolysis environment, have guaranteed that first working electrode and second working electrode are unanimous to the response characteristic of environmental factor. In addition, the pore diameters of the first capillary hole and the second capillary hole are different, so that the inconsistency of the diffusion mass transfer resistance of the gas reaching the first reaction surface of the first working electrode through the first capillary hole and the diffusion mass transfer resistance of the gas reaching the second reaction surface of the second working electrode through the second capillary hole is ensured in the actual detection process. Therefore, in the actual detection process, the influence of the environmental commonality factor can be deducted through the response difference value of the first working electrode and the second working electrode, and the accuracy of the sensor measurement is improved. In addition, because the working environments of the first working electrode and the second working electrode are consistent, that is, the zero signals of the first working electrode and the second working electrode are consistent, and the response sensitivities of the target gas and the interference gas can be obtained through calibration, the respective concentrations of the target gas and the interference gas can be respectively obtained through the output current signal value of the first working electrode and the output current signal value of the second working electrode under the condition that the interference gas exists, and the accuracy of the detection result is ensured. Therefore, the utility model provides an electrochemistry gas sensor's beneficial effect is: the detection process is not influenced by environmental factors, the target gas can be accurately detected under the condition that the interference gas exists, the detection result is accurate, and the selectivity is wide.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a cross-sectional view of an electrochemical gas sensor according to a first embodiment of the present invention;
FIG. 2 shows NO of an electrochemical gas sensor assembly according to a first embodiment of the present invention2A test chart for testing the followability of the base lines of the first working electrode and the second working electrode of the sensor along with the change of temperature;
fig. 3 is a cross-sectional view of an electrochemical gas sensor according to a second embodiment of the present invention;
fig. 4 is a cross-sectional view of an electrochemical gas sensor according to a third embodiment of the present invention.
Icon: 100-an electrochemical gas sensor; 110-a housing; 111-a housing chamber; 113-a first capillary pore; 115-second capillary; 116-inlet port; 117-first filter chamber; 118-a second filter chamber; 119-a third filter chamber; 120-a reference electrode; 130-a counter electrode; 140-a first working electrode; 141-a first reaction surface; 150-a second working electrode; 151-second reaction surface; 160-a spacer; 170-pin.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In order to improve the stability of the electrochemical gas sensor, the response value of the sensor needs to be designed in a gas phase limit diffusion current region as much as possible during design, which can be realized by improving the catalytic activity and increasing the diffusion resistance, so that the response of the sensor is completely determined by the gas phase mass transfer speed of the gas, and the gas phase mass transfer speed is basically determined by the gas flow rate, the physicochemical characteristic (gas diffusion coefficient) of the gas to be detected and the mechanical shape design size or the diffusion permeability characteristic of a gas flow limiting device preset by the sensor.
The following describes in detail embodiments of the present invention with reference to the accompanying drawings.
First embodiment
Referring to fig. 1, the electrochemical gas sensor 100 provided in this embodiment is suitable for detecting multiple target gases in multiple environments, the detection process is not affected by environmental factors, the target gases can be accurately detected in the presence of interfering gases, the detection result is accurate, and the selectivity is wide.
The electrochemical gas sensor 100 of the present embodiment includes a housing 110, a reference electrode 120, a counter electrode 130, a first working electrode 140, a second working electrode 150, a spacer 160, and a pin 170.
The inner wall of the casing 110 forms an accommodating cavity 111, the accommodating cavity 111 is used for accommodating an electrolyte, the reference electrode 120, the counter electrode 130, the first working electrode 140 and the second working electrode 150 are accommodated in the accommodating cavity 111, and in practical application, the reference electrode 120, the counter electrode 130, the first working electrode 140 and the second working electrode 150 are all immersed in the electrolyte. The plurality of pins 170 are disposed on the outer wall of the housing 110, and are electrically connected to the respective electrodes, respectively, for outputting an electrical signal.
The first working electrode 140 is provided with a first reaction surface 141, the second working electrode 150 is provided with a second reaction surface 151, and the materials of the first working electrode 140 and the second working electrode 150 are consistent with the preparation process, the electrode areas are consistent, and the working electrodes are in the same electrolyte environment. The first reaction surface 141 and the second reaction surface 151 are both attached to the inner wall of the housing 110 enclosing the accommodating cavity 111. The housing 110 corresponding to the first working electrode 140 is provided with a first capillary 113 for guiding the external gas to be detected to the first reaction surface 141 for chemical reaction to generate a current signal. The housing 110 is further provided with a second capillary 115 corresponding to the second working electrode 150, and the second capillary 115 is used for guiding an external gas to be detected to the second reaction surface 151 for chemical reaction to generate a current signal.
In this embodiment, the aperture of the first capillary 113 is larger than the aperture of the second capillary 115, that is, it is ensured that the first working electrode 140 and the second working electrode 150 contact the gas to be measured in different ways under the condition that other factors are completely consistent, even if the mass transfer resistance of the gas diffusion on the first reaction surface 141 and the second reaction surface 151 is not consistent.
In this embodiment, a first filter chamber 117 and a second filter chamber 118 are respectively recessed in a wall of the housing chamber 111 enclosed by the housing 110, the first filter chamber 117 and the second filter chamber 118 are disposed at an interval, and both the first filter chamber 117 and the second filter chamber 118 are used for housing a filter material to filter the intake air. The opening of the first filter cavity 117 is sealed by the first reaction surface 141 arranged on the first working electrode 140, one end of the first capillary hole 113 is arranged on the end wall of the end of the first filter cavity 117 far away from the first reaction surface 141, the other end of the first capillary hole 113 is arranged on the outer wall of the shell 110, and in practical application, the first capillary hole 113 is used for guiding the external gas to be detected into the first filter cavity 117 and reaches the first reaction surface 141 after being filtered by the filter material. The opening of the second filter cavity 118 is closed by a second reaction surface 151 disposed on the second working electrode 150, one end of the second capillary 115 is opened on the end wall of the second filter cavity 118 far from the second reaction surface 151, that is, the second capillary 115 and the first capillary 113 are opened on the same cavity wall, and the other end of the second capillary 115 is opened on the outer wall of the housing 110, in practical application, the second capillary 115 is used to guide the external gas to be measured into the second filter cavity 118, and reaches the second reaction surface 151 after being filtered by the filter material.
In this embodiment, the separator 160 is disposed on the outer wall of the housing 110, and covers the openings of the first capillary 113 and the second capillary 115, which are respectively opened on the outer wall of the housing 110, for separating moisture and dust.
In the embodiment, by using the response characteristics of the electrodes to the target gas and the environmental factors, the interference of most environmental factors on the measurement of the sensor is compensated and the reliability of the measurement is improved by setting the first working electrode 140 and the second working electrode 150, the properties of which are completely consistent with the electrolyte environment.
Suppose that: first working electrode 140 has a corresponding sensitivity to the target gas of S1And the response sensitivity of the second working electrode 150 to the target gas is S2(ii) a First working electrode 140 has a response I to a target gas having a concentration C1Second working electrode 150 has a response value of I to a target gas having a concentration of C2(ii) a The baseline signal of first working electrode 140 is I10The baseline signal of second working electrode 150 is I20. Then:
I1＝S1*C+I10(1)
I2＝S2*C+I20(2)
therefore, the temperature of the molten metal is controlled,
S1＝(I1-I10)/C (3)
S2＝(I2-I20)/C (4)
when calibrating the sensor, according to the formula (3) and (4)10、I20、I1、I2C can be calculated to obtain S1And S2. When measuring the target gas, S is known1And S2The target gas concentration C can be calculated by the formulas (1) and (2).
In this embodiment, the materials of the first working electrode 140 and the second working electrode 150 are the same as the preparation process, the electrode areas are the same, and the working electrodes are in the same electrolyte environment, so that the response characteristics of the first working electrode 140 and the second working electrode 150 to the environmental factors are the same, i.e. I10And I20The change trend and the size of the change along with the environmental factors are basically consistent, because when the target gas does not exist, the change of the environmental factors such as temperature, humidity, pressure, gas flow and the like can not generate continuous reaction current on the working electrode, and concentration polarization can not be formed. And, it is also ensured that the catalytic activities of first working electrode 140 and second working electrode 150 for the target gas are substantially uniform.
The pore size of the first capillary 113 is larger than that of the second capillary 115, i.e., the gas diffusion mass transfer resistance of the gas reaching the first working electrode 140 from the first capillary 113 is not consistent with the gas reaching the second working electrode 150 from the second capillary 115. When the target gas is present, due to the response signal I of the electrode1And I2Is greatly affected by diffusion mass transfer, the response sensitivity S of first working electrode 140 and second working electrode 150 to the target gas1、S2There are large differences. Therefore, the difference is obtained by (1) and (2):
I1-I2＝(S1-S2)*C+(I10-I20) (5)
C＝[(I1-I2)-(I10-I20)]/(S1-S2) (6)
because of the same environmental conditions, the baseline of first working electrode 140 is very close to second working electrode 150, and therefore, I can be considered to be10＝I20Therefore, equation (6) can be simplified as:
C＝(I1-I2)/(S1-S2) (7)
thus passing through a known concentrationC Standard gas measures S of first working electrode 1401S with second working electrode 1502I obtained when measuring gas of unknown concentration1And I2The concentration C of the unknown gas is calculated according to the formula (7), and the influence of the environmental factor on the electrochemical gas sensor 100 provided in this embodiment can be mostly deducted.
If more accurate calculation results are required, I can be defined10-I20Δ (T), which is a quantity related to the temperature T, can be derived from the baseline difference at different temperatures to a fitted curve equation, and therefore equation (7) can be rewritten as:
C＝[(I1-I2)-Δ(T)]/(S1-S2) (8)
in this way, under different temperature test environments, the influence of the environmental factor change on the baseline of the electrochemical gas sensor 100 provided by this embodiment can be reduced to the greatest extent by using the formula (8), and the concentration value of the target gas can be calculated more accurately.
NO assembled with electrochemical gas sensor 100 provided according to this embodiment2The following test of the baseline of the first working electrode 140 and the second working electrode 150 of the sensor with the temperature change is taken as an example, and the test result is shown in fig. 2.
During the test, the temperature rise rate was 2 ℃/min. As can be seen from fig. 2, in the whole temperature changing process in which the temperature gradually increases from 20 ℃ to 50 ℃ and then decreases to-20 ℃, the change trends of the baseline output current values corresponding to the first working electrode 140 and the second working electrode 150 are very consistent and almost respond synchronously to the temperature change, which indicates that the steady state of the baseline-temperature curve and the change following of the baseline of the two electrodes during the transient change are very high.
The baseline output current value of either first working electrode 140 alone or second working electrode 150 alone is not as sensitive to temperature changes at temperatures below 30 degrees celsius, but increases rapidly with increasing temperature after exceeding 30 degrees celsius. Without the second working electrode 150, the baseline change of the sensor would be over 200ppb, and this baseline temperature drift would greatly affect the accuracy of the environmental monitoring. If according to the utility model discloses a design, after utilizing second working electrode 150's baseline output current value to carry out the difference deduction to first working electrode 140's output current value, the baseline of sensor all keeps a basic invariable value in whole temperature variation range, and the baseline temperature after the deduction floats within 10ppb, has guaranteed the accuracy that the sensor measured when using in the environmental monitoring field.
The present embodiment provides an electrochemical gas sensor 100, in which the number of working electrodes can be increased adaptively according to specific application conditions.
For example, when detecting a mixed gas in which the target gas a and the interfering gas B exist simultaneously, a third working electrode having the same properties as the first working electrode 140 and the second working electrode 150 is added to the electrochemical gas sensor 100 provided in this embodiment, and a third capillary is also correspondingly disposed on the housing 110, and the pore diameter of the third capillary is also different from that of the first capillary 113 and the second capillary 115. The specific responses are as follows:
wherein the content of the first and second substances,
and
respectively representing the sensitivity of the first working electrode 140 to the target gas a and the interfering gas B, respectively;
and
respectively representing the sensitivity of the second working electrode 150 to the target gas a and the interfering gas B, respectively;
and
respectively representing the sensitivity of the third working electrode to the target gas A and the sensitivity of the third working electrode to the interference gas B; s10、S20And S30Respectively represent the respective zero signals of first working electrode 140, second working electrode 150, and third working electrode; cAAnd CBRespectively representing the concentration of the target gas a and the concentration of the interfering gas B.
Since the materials and the preparation processes of the first working electrode 140, the second working electrode 150 and the third working electrode are substantially the same and are in the same environment, the zero signals thereof are substantially the same, assuming that S is the case0＝S10＝S20＝S30，
All can be obtained by pre-calibration, therefore, C can be calculated according to the formulas (9), (10) and (11)A、CBAnd S0。
In particular, if used for high concentration gas detection, the gas concentration value corresponding to the sensor baseline is a minimum value relative to the target gas concentration. In this case, the sensor zero signal can be treated as a constant value. At this time, the requirement of measurement accuracy can be satisfied only by using the design of the first working electrode 140 and the second working electrode 150.
By utilizing the above characteristics, the three mixed gas sensors manufactured based on the electrochemical gas sensor 100 provided in the present embodiment are each for CO and H2The mixed gas of (2) was subjected to a detection test, and each test data is shown in table 1.
TABLE 1
It can be seen that, in the three mixed gas sensors manufactured based on the electrochemical gas sensor 100 provided in this embodiment, the detection data is calculated according to the formulas (9), (10) and (11) to obtain CO and H2The coincidence degree of the respective concentration calculation value and the respective real value is extremely high, namely the detection result is reliable.
Therefore, the electrochemical gas sensor 100 provided by the embodiment can accurately detect the target gas under the condition that the interference gas exists, the detection of the mixed gas is met, and the measurement selectivity of the sensor is improved.
In summary, the electrochemical gas sensor 100 provided in this embodiment is suitable for detecting multiple target gases in multiple environments, the detection process is not affected by environmental factors, the target gases can be accurately detected in the presence of interfering gases, the detection result is accurate, and the selectivity is wide.
Second embodiment
Referring to fig. 3, in comparison with the first embodiment, in the electrochemical gas sensor 100 provided in this embodiment, one end of the first capillary 113 is opened on the end wall of the first filter cavity 117 at the end far away from the first reaction surface 141, the other end of the first capillary 113 is opened on the outer wall of the housing 110, and two ends of the second capillary 115 are respectively opened on the respective cavity walls of the first filter cavity 117 and the second filter cavity 118 which are close to each other.
That is, in practical application, the external air sequentially passes through the isolating member 160, the first capillary hole 113 and the first filter cavity 117 to reach the first reaction surface 141, and sequentially passes through the isolating member 160, the first capillary hole 113, the first filter cavity 117, the second capillary hole 115 and the second filter cavity 118 to reach the second reaction surface 151.
In other embodiments, the positions of the first capillary hole 113 and the second capillary hole 115 can be interchanged, that is, the first capillary hole 113 can be configured to communicate with the first filter cavity 117 and the second filter cavity 118, and the second capillary hole 115 can be configured to directly communicate with the outside.
The electrochemical gas sensor 100 provided in this embodiment is used for detecting a plurality of target gases in a plurality of environments, the detection process is not affected by environmental factors, the target gases can be accurately detected in the presence of interfering gases, the detection result is accurate, and the selectivity is wide.
Third embodiment
Referring to fig. 4, in comparison with the first embodiment, in the electrochemical gas sensor 100 provided in this embodiment, a third filter cavity 119 (corresponding to the first filter cavity 117 and the second filter cavity 118 in the first embodiment) for accommodating a filter material is disposed on the housing 110, one end of the first capillary hole 113 is disposed on the cavity wall at one end of the third filter cavity 119, the other end of the first capillary hole 113 is disposed on the inner wall of the housing 110 and attached to the first reaction surface 141, one end of the second capillary hole 115 is disposed on the cavity wall at one end of the third filter cavity 119, the other end of the second capillary hole 115 is disposed on the inner wall of the housing 110 and attached to the first reaction surface 141, and one ends of the first capillary hole 113 and the second capillary hole 115 are respectively disposed on the cavity wall at the same end of the third filter cavity 119, an air inlet 116 is further formed in the cavity wall of one end of the third filter cavity 119, which is away from the first capillary hole 113 and the second capillary hole 115, one end of the air inlet 116 is formed in the cavity wall of one end of the third filter cavity 119, which is away from the first capillary hole 113, and the other end of the air inlet 116 is formed in the outer wall of the housing 110.
In practical applications of the electrochemical gas sensor 100 provided in this embodiment, after the external gas sequentially passes through the spacer 160 and the gas inlet 116 to enter the third filter cavity 119, the external gas reaches the first reaction surface 141 through the first capillary 113 or reaches the second reaction surface 151 through the second capillary 115.
The electrochemical gas sensor 100 provided in this embodiment is used for detecting a plurality of target gases in a plurality of environments, the detection process is not affected by environmental factors, the target gases can be accurately detected in the presence of interfering gases, the detection result is accurate, and the selectivity is wide.
To sum up, the utility model provides an electrochemical gas sensor 100, the aperture of guaranteeing first capillary 113 is different from the aperture of second capillary 115, guarantee that first working electrode 140 contacts with the gas that awaits measuring respectively with second working electrode 150 in different modes under the condition that other self factors are all unanimous promptly, even obtain the inconsistent prerequisite of the gas diffusion mass transfer resistance that reaches on first reaction surface 141 and the second reaction surface 151, first capillary 113 can carry out multiple adaptability with the setting mode and the position of second capillary 115 on casing 110 and change, and not only confine the arrangement form that first embodiment, second embodiment and third embodiment show to.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electrochemical gas sensor is characterized by comprising a shell, a reference electrode, a counter electrode, a first working electrode and a second working electrode, wherein an accommodating cavity for accommodating electrolyte is formed by enclosing the inner wall of the shell, the reference electrode, the counter electrode, the first working electrode and the second working electrode are accommodated in the accommodating cavity, a first reaction surface is arranged on one side of the first working electrode, a second reaction surface is arranged on one side of the second working electrode, the first reaction surface and the second reaction surface are respectively attached to the inner wall of the shell, a first capillary hole and a second capillary hole are respectively formed in the shell, one end of the first capillary hole is communicated with the outside, the other end of the first capillary hole is used for guiding outside gas to the first reaction surface, and one end of the second capillary hole is communicated with the outside, the other end of the second capillary is used for guiding outside air to the second reaction surface, and the aperture of the first capillary is larger than that of the second capillary.
2. The electrochemical gas sensor according to claim 1, wherein the inner wall of the housing is recessed with a first filter chamber and a second filter chamber at intervals for accommodating a filter material, the first reaction surface closes the opening of the first filter chamber, the second reaction surface closes the opening of the second filter chamber, the first filter chamber is communicated with the outside through the first capillary hole, and the second filter chamber is communicated with the outside through the second capillary hole.
3. The electrochemical gas sensor according to claim 2, wherein one end of the first capillary hole is opened on the end wall of the first filter chamber at the end far away from the first reaction surface, and the other end of the first capillary hole is opened on the outer wall of the housing.
4. The electrochemical gas sensor according to claim 2, wherein one end of the second capillary hole is opened on the end wall of the second filter chamber at the end far away from the second reaction surface, and the other end of the second capillary hole is opened on the outer wall of the housing.
5. The electrochemical gas sensor according to claim 2, wherein one end of the first capillary hole is opened on an end wall of the first filter chamber at an end far away from the first reaction surface, the other end of the first capillary hole is opened on an outer wall of the housing, and two ends of the second capillary hole are respectively opened on respective chamber walls of the first filter chamber and the second filter chamber close to each other.
6. The electrochemical gas sensor according to claim 2, wherein one end of the second capillary hole is opened on an end wall of the second filter chamber at an end far away from the second reaction surface, the other end of the second capillary hole is opened on an outer wall of the housing, and two ends of the first capillary hole are respectively opened on respective chamber walls of the first filter chamber and the second filter chamber close to each other.
7. The electrochemical gas sensor according to claim 1, wherein a third filter chamber for accommodating a filter material is disposed on the housing, one end of the first capillary hole is opened on a chamber wall at one end of the third filter chamber, the other end of the first capillary hole is opened at a position attached to the first reaction surface on the inner wall of the housing, one end of the second capillary hole is opened on a chamber wall at one end of the third filter chamber, the other end of the second capillary hole is opened at a position attached to the first reaction surface on the inner wall of the housing, and the third filter chamber is communicated with the outside.
8. The electrochemical gas sensor according to claim 7, wherein one end of each of the first capillary hole and the second capillary hole is opened on a wall of the third filter chamber at the same end.
9. The electrochemical gas sensor according to claim 8, wherein the housing further comprises a gas inlet, one end of the gas inlet is opened on the wall of the third filter chamber at the end far away from the first capillary hole, and the other end of the gas inlet is opened on the outer wall of the housing.
10. The electrochemical gas sensor according to claim 1, further comprising a separator disposed on an outer wall of the housing for separating moisture and dust, wherein the first capillary hole and the second capillary hole are in communication with the outside through the separator.
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| CN110261458A (en) * | 2019-07-29 | 2019-09-20 | 盛密科技(上海)有限公司 | A kind of electrochemical gas sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261458A (en) * | 2019-07-29 | 2019-09-20 | 盛密科技(上海)有限公司 | A kind of electrochemical gas sensor |
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