CN212031401U

CN212031401U - Portable gas detector

Info

Publication number: CN212031401U
Application number: CN202020176169.3U
Authority: CN
Inventors: 樋口大明
Original assignee: New Cosmos Electric Co Ltd
Current assignee: New Cosmos Electric Co Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2020-11-27
Anticipated expiration: 2030-02-17

Abstract

The application discloses a portable gas detector, which is provided with a housing (200), an operation unit (212), a display unit (211), a control unit, and a plurality of gas sensors (100), wherein the housing (200) comprises: a main body (210) and a cover member (220), wherein the cover member (220) is detachable from the main body (210), and a housing space for housing the plurality of gas sensors (100) is formed by combining the main body (210) and the cover member (220), and the housing space has a plurality of housing sections (a) capable of housing the gas sensors (100) having different shapes.

Description

Portable gas detector

Technical Field

The utility model relates to a gaseous detection area especially relates to a portable gas detector.

Background

Typically, the presence of multiple gases (e.g., O) in an ambient atmosphere is detected₂CO, combustible gases, toxic gases, etc.). Since the gas to be detected differs depending on the kind of gas to be detected in the detection environment, the gas detector is required to have a function of detecting different kinds of gas.

In a conventional gas detector, in order to detect different types or concentration ranges of gases, a plurality of different types of sensors are generally mounted on a substrate and housed in a case. For example, patent document 1 discloses an explosion-proof portable gas detection device in which all five gas sensors are mounted on a substrate, and detection gas is sucked into a detection region by a gas suction pump and detected, thereby detecting a plurality of gases. Patent document 2 discloses a portable gas alarm device having a holding portion on the back surface of a substrate, the holding portion detachably holding five gas sensors, and detecting by supplying gas introduced from a gas introduction portion to each of the sensors.

However, since the sizes of these different types of sensors are greatly different depending on the detection principle, if a plurality of sensors having different sizes are integrated into the same gas detector in a conventional manner, the housings of the gas detector need to be designed separately according to the size of the mounted sensor, which results in high design cost and low flexibility of application.

Patent document 1: japanese patent No. 3764737

Patent document 2: japanese patent No. 5778461

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned problem, provide a portable gas detector, it possesses: casing, operating portion, display part, control part and a plurality of gas sensor, the casing includes: a main body; and a cover member that is detachable from the main body, and that forms a housing space that houses the plurality of gas sensors by combining the main body and the cover member, the housing space having a plurality of housing portions that can house the gas sensors having different shapes.

According to the portable gas detector of the present invention, since the plurality of sensors having different shapes are accommodated in the plurality of accommodation portions provided in the accommodation space, the plurality of sensors can be integrated in the gas detector, and the sensors having different shapes and sizes can be accommodated in the plurality of accommodation portions, the gas detector can be manufactured using a common case even in combination with different sensors.

Preferably, the portable gas detector further includes a spacer that can accommodate at least one of the plurality of gas sensors and can abut against the inner surface of the cover member.

According to the portable gas detector of the present invention, the plurality of gas sensors can be stably stored in the portable gas detector by using the spacer.

Preferably, in the above portable gas detector, the spacer includes: a spacer having a first surface that contacts an inner surface of the cover member and a second surface that faces the at least one gas sensor; and a housing portion in which the at least one gas sensor is housed so as to be able to abut against the second surface.

According to the portable gas detector of the present invention, the gas sensor is accommodated in the spacer in the above manner, and the gas sensor can be stably accommodated in the spacer.

Preferably, in the above portable gas detector, the spacer has one or more communication holes that pass through the spacer from the first surface to the second surface of the spacer.

According to the present invention, the gas sensor can be accommodated in the accommodating portion of the partition member through the communicating hole.

Preferably, in the portable gas detector, the lid member has a lid body that engages with the inner lid body to form a gas flow passage therebetween, and an inner lid body that has one or more vent holes that communicate with the gas flow passage.

According to the utility model provides a portable gas detector, it can flow in above-mentioned gas flow path to wait to detect gas to can follow the inside storage space of portable gas detector of air vent inflow.

Preferably, in the portable gas detector, the plurality of gas sensors include a first gas sensor housed in one of the housing portions such that an introduction surface formed with a gas introduction hole for introducing gas into the interior thereof faces the vent hole of the inner cover of the cover member, and a second gas sensor housed in the other housing portion such that an introduction surface formed with a gas introduction hole for introducing gas into the interior thereof faces the communication hole of the spacer.

According to the utility model provides a portable gas detector can will wait to detect that gaseous leading-in different gas sensor is inside to detect effectively.

Preferably, in the above portable gas detector, the housing portion of the spacer is formed with a fitting opening through which the spacer is attached to the housing portion.

According to the portable gas detector of the present invention, the spacer is attached to the housing portion through the engaging hole, so that the spacer can be firmly connected to the main body and can be prevented from rotating in the radial direction.

Preferably, in the above portable gas detector, the housing portion of the spacer has a sealing member located between the introduction surface of the at least one gas sensor and the second surface of the spacer portion.

According to the utility model provides a portable gas detector can will wait to detect that gaseous leading-in gas sensor is inside to detect effectively to set up seal part between gas sensor's leading-in face and interval portion, can be under the condition that receives external force and assault, restrain the damage to gas sensor, and improved the explosion-proof.

Preferably, in the above portable gas detector, the cover member has: and a plurality of stopper portions having the same height, the stopper portions corresponding to the plurality of receiving portions, the vent holes being formed in the stopper portions, the stopper portions abutting against the introduction surface of the gas sensor or the first surface of the spacer portion of the spacer.

According to the present invention, the plurality of gas sensors can be stably stored in the portable gas detector by using the plurality of limiting portions.

Preferably, in the above portable gas detector, the housing portion of the spacer has a plurality of sealing member arrangement portions capable of arranging a plurality of the sealing members having different shapes.

According to the utility model provides a portable gas detector, to different gas sensor, in the distance piece, dispose the sealing member that the shape is different in corresponding sealing member configuration portion, improved the compatibility of distance piece to different gas sensor.

Drawings

Fig. 1A and 1B are a front view and a rear view, respectively, illustrating a gas detector in an embodiment.

Fig. 2 is an exploded perspective view showing a lid member in the embodiment.

Fig. 3A is a partial rear view of the gas detector in the embodiment with the first gas sensor and the second gas sensor mounted; fig. 3B is a sectional view showing a state where the gas detector in fig. 3A is cut along a line t-t' in fig. 1B.

Fig. 4A is a partial rear view showing a state in which the gas detector in the embodiment is mounted with the first gas sensor and the spacer; fig. 4B is a sectional view showing a state where the gas detector in fig. 4A is cut along a line t-t' in fig. 1B.

Fig. 5A and 5B are a perspective view and a sectional view, respectively, illustrating a spacer in an embodiment.

Fig. 6A and 6B are a perspective view and a sectional view, respectively, showing a state in which the spacer in the embodiment accommodates the second gas sensor.

Fig. 7 is a sectional view showing a state where the gas detector to which the first gas sensor and the second gas sensor are attached is cut along a line t-t' in fig. 1.

Fig. 8 is a sectional view showing a state where the gas detector mounted with the first gas sensor and the spacer is cut along a line t-t' in fig. 1.

Description of reference numerals:

200 … a housing; 210 … a body; 211 … display part; 212 … an operating part; 213 … air inlet; 214 … air outlet; 220 … cover member; 221 … cover body; 100 … gas sensor; 100a … first gas sensor; 100B … second gas sensor; a … storage part; 215 … base; 300 … spacer; 130A, 130B … lead-in surfaces; 310 … spacer; 320 … a housing; 322 … snap-fit port; 323 … sealing member (O-ring); 223 … limiting part; 222 … an inner cover; a K1 … vent; k2 … communication hole; s1 … first side; s2 … second side.

Detailed Description

The following describes a portable gas detector according to an embodiment of the present invention with reference to the drawings.

1. Overview of a Portable gas Detector

Fig. 1A is a front view of a portable gas detector 10 according to an embodiment of the present invention, and fig. 1B is a rear view showing a back surface thereof. The portable gas detector 10 (hereinafter, simply referred to as a gas detector 10) is used for detecting a plurality of gases in a detection environment, and the gas detector 10 includes, for example: a housing 200 accommodating various components therein; a display unit 211 for displaying various information such as gas detection result information, instrument operation state information, and detectable gas type information; an operation unit 212 having a control key for inputting information for controlling the operation of the gas detector 10 to a control unit (not shown); a control unit (not shown) for controlling the operation of the entire gas detector 10; and a plurality of gas sensors 100 (see first and

second gas sensors

100A and 100B in fig. 3A and 3B) are accommodated in the housing 200 for detecting the presence or concentration of a gas to be detected.

The gas detector 10 of the present embodiment can suck a gas to be detected in a detection environment into a gas flow path inside the gas detector 10 from a gas inlet 213, detect the gas to be detected using a plurality of built-in gas sensors 100, transmit detection information to a control unit in the gas detector 10, convert the received detection information into a control signal by the control unit, and output the control signal to a display unit 211 and an alarm (not shown), the display unit 211 displays information related to the detection information based on the received control signal, the alarm emits an alarm sound when receiving a control signal that the gas sensor 100 detects a certain gas or that the certain gas reaches a certain concentration range, and thereafter, discharges the detected gas from a gas outlet 214 to the outside of the gas detector 10 through the gas flow path. Therefore, the gas detection device can effectively detect various gases in the detection environment, and a user can timely know the information about the detected gas in the current detection environment, and can obtain an alarm when the specific gas is detected or reaches a certain concentration range, so that dangerous conditions can be prevented.

2. Shell body

As shown in fig. 1A and 1B, the housing 200 of the gas detector 10 is formed by combining a main body 210 and a cover member 220, and the cover member 220 can be attached to the back of the main body 210 by, for example, screwing or engaging. The housing 200 of the gas detector 10 may be made of an insulating material, a polymer resin material, an alloy material, or the like, an insulating coating such as a resin may be applied to the surface of the housing 200, or a protective cover may be formed outside the housing 200, and the material constituting the protective cover may be different from the material of the housing 200.

In addition to the main body 210 serving as a housing of the gas detector 10 in the present embodiment, the main body 210 has a plurality of bases 215 protruding upward on a surface facing the cover member 220 as shown in fig. 3A and 3B. The plurality of bases 215 are formed in an annular shape having a notch when viewed from the top in fig. 3A. The main body 210 may be composed of two members, i.e., a front-side member and a back-side member. For example, a circuit board including the display unit 11, the operation unit 212, and the control unit may be mounted on the front surface side member, and the circuit board may be accommodated between the front surface side member and the rear surface side member, or a sub-board holder provided with a sub-board for the gas sensor 100 may be mounted on the rear surface side member.

As shown in fig. 1B and 2, the cover member 220 in the present embodiment is attached to the back of the housing 200 and detachably connected to the main body 210. The lid member 220 includes a lid body 221 and an inner lid body 222, the lid body 221 is a portion constituting an outer surface of the case 200, and the inner lid body 222 is engaged with the lid body 221 and spaced apart from the lid body 221 by a predetermined distance. By engaging the inner lid body 222 with the inside of the lid main body 221, a cavity serving as a part of the gas flow path is formed therebetween. Two stopper portions 223 having substantially the same height and extending in the thickness direction of the gas detector 10 are formed on the side of the inner cover 222 facing the main body 210. The two stoppers 223 are formed with one or more vent holes K1, respectively. The gas to be detected can flow through the gas flow path and can flow into the housing space a inside the gas detector 10 from the vent hole K1.

3. Storage part

The housing portion a in the present embodiment will be described below.

The plurality of receiving portions a in the present embodiment are formed in a receiving space a formed by assembling the main body 210 and the cover member 220 of the case 200. Specifically, the housing space a is a space formed by attaching the cover member 220 to the main body 210 and housing the plurality of gas sensors 100, and the plurality of housing portions a can house the gas sensors 100 having different shapes.

As shown in fig. 3A and 3B, the main body 210 is formed with a plurality of bases 215 protruding upward, and the plurality of bases 215 are formed in a ring shape having a notch. In addition, as shown in fig. 7, in the housing space a, the plurality of bases 215 protruding from the main body 210 and the stopper 223 of the cover member 220 are made to correspond to each other in the thickness direction of the gas detector 10, thereby defining the respective housing portions a. Specifically, the surfaces of the inner cover 222 and the body 210 facing each other define the height of the receiving portion a, and the stopper 223 of the inner cover 222 and the base 215 of the body 210 define the upper portion and the lower portion of the receiving portion a, respectively. One receiving portion a may be formed in the receiving space a, or two or more receiving portions a may be formed. The gas sensor 100 can be housed in the housing portion a. In the attached state, the stopper 223 abuts against the introduction surface 130B of the gas sensor 100 or the first surface s1 of the spacer 310 of the spacer 300.

In order to accommodate the gas sensors 100 of different sizes in the housing portion a, the housing portion a is set to have a high height, and the inner diameter of the housing portion a is larger than the outer diameter of the gas sensor 100 or substantially equal to the outer diameter of the gas sensor 100 as viewed in plan. Thus, the gas sensors 100 of different types and sizes can be stored in the storage portions a. The gas detector 10 can be manufactured using a common housing 200 even for a combination of different gas sensors 100.

4. Spacer member

Next, the spacer 300 according to the present embodiment will be described with reference to fig. 4A and 4B to fig. 6A and 6B.

As shown in fig. 4A and 4B, the gas detector 10 according to the present embodiment further includes a spacer 300, and the spacer 300 can accommodate at least one gas sensor 100 of the plurality of gas sensors 100 and can abut against the inner surface of the cover member 220. As shown in fig. 5A, the spacer 300 is formed in a substantially cylindrical shape as a whole, and includes a spacer portion 310 and an accommodating portion 320, the spacer portion 310 and the accommodating portion 320 may be combined as separate members to form the spacer 300, and the spacer portion 310 and the accommodating portion 320 may be integrally molded to form the spacer 300. By using the spacer 300, the plurality of gas sensors 100 can be stably housed in the portable gas detector 10.

As shown in fig. 5B, the spacer 310 has a first surface s1 and a second surface s2, wherein the first surface s1 is an end surface of the spacer 300 and abuts against the inner surface of the cover member 220 in the mounted state. The second surface s2 is formed on the other surface of the spacer 310 opposite to the first surface s 1. The spacer 310 has one or more communication holes K2, and the communication hole K2 penetrates the spacer 310 from the first surface s1 to the second surface s2 of the spacer 310. The gas sensor 100 is accommodated in the spacer 300 in the above manner, so that the gas sensor 100 can be stably accommodated in the spacer 300, and the gas to be detected received from the first surface s1 of the spacer 310 can enter the accommodating portion 320 in which the gas sensor 100 is accommodated in the spacer 300 through the communication hole K2.

The accommodating portion 320 is formed by the second surface s2 of the spacer portion 310 and a circumferential wall provided upright so as to surround the second surface s2, and is formed in a structure in which one end of the opposite side of the second surface s2 (the opposite side of the first surface s1 with respect to the second surface s2) is open, the accommodating portion 320 is a portion of the spacer 300 for accommodating the gas sensor 100, and the spacer 300 can cover the gas sensor 100 from above through the accommodating portion 320. The accommodating portion 320 has a plurality of engaging holes 322 formed at one end of the circumferential wall surrounding the second surface s2 on the side where the opening is formed, and the spacer 300 can be attached to the accommodating portion a by engaging the plurality of engaging holes 322 with the base 215 protruding upward from the main body 215, and the spacer 300 can be fixed to the main body by the engagement and can be prevented from rotating in the radial direction.

The accommodating portion 320 of the spacer 300 may have a plurality of O-ring arrangements 321 and an O-ring 323 arranged in one of the O-ring arrangements 321. The plurality of O-ring disposing portions 321 can dispose O-rings having different shapes. In the present embodiment, the O-ring 323 is used as an example of the sealing member, but the sealing member may be realized by another method. As shown in fig. 6A and 6B, in the housing 320, the introduction surface 130 of the gas sensor 100 abuts against the O-ring 323 in the O-ring arrangement portion 321. However, since the introduction surfaces 130 of the various gas sensors 100 may have different areas and shapes and the distances between the introduction surfaces 130 and the second surface s2 of the spacer 300 may be different when the various gas sensors 100 are accommodated in the accommodating portions 320, the O-ring 323 having a thickness or a radial width corresponding to a specific type of the gas sensor 100 may be arranged in a specific O-ring arrangement portion 321 in order to accommodate the various gas sensors 100 in the accommodating portions 320, thereby improving the compatibility of the spacer 300 with respect to the different gas sensors 100. For example, when the gas sensor 100 is a toxic gas sensor, the O-ring can be provided thick because its shape is flat.

According to the gas detector 10 of the present embodiment, the gas to be detected can be efficiently introduced into the gas sensor 10 to be detected, and the O-ring 323 is provided between the introduction surface 130B of the second gas sensor 100B and the spacer 310, so that damage to the gas sensor 100 can be suppressed and the explosion resistance can be improved when an external force impacts. Further, in the spacer 300, the O-rings 323 having different shapes are disposed in the corresponding O-ring disposing portions 321 with respect to the different second gas sensors 100B, and compatibility of the spacer 300 with respect to the different second gas sensors 100B is improved.

5. Gas sensor

Next, the gas sensor 100 according to the present embodiment will be described.

The gas sensor 100 in the present embodiment is, for example, a converter that converts a certain gas volume fraction into a corresponding electric signal, and the gas sensor 100 may be any one or two or more kinds of a semiconductor gas sensor, an electrochemical gas sensor, an optical gas sensor, and the like. The gas sensor 100 can be applied to the detection of the following gases: SO (SO)₂、NO、NO₂、H₂S、NH₃、HCl、HCN、COCl₂Toxic gases such as HF, formaldehyde (HCHO), etc.; CO, H₂、CH₄、C₂H₆、C₂H₄、C₂H₂And the like are flammable and explosive gases; o is₂、CO₂And the like.

The gas sensor 100 of the present embodiment has an introduction surface 130 in which a gas introduction hole for introducing gas into the inside is formed. When a voltage is applied to the sensor element inside the gas sensor 100, the detection gas is introduced into the gas sensor 100 through the introduction hole of the introduction surface 130, and then receives electrons on the sensor element, which causes a decrease in resistance and an increase in conductivity of the sensor element, and a change in conductivity is proportional to the gas concentration. Of course, the gas sensor 100 described above is merely an example, and the gas sensor in the present embodiment is not limited thereto, and may be any type known in the art. The sizes of the gas sensors are different according to different detection principles of the gas sensors.

The gas sensor 100 of the present embodiment may include a first gas sensor 100A and a second gas sensor 100B. However, the gas sensor 100 of the present embodiment may also include 1 or more than 2 gas sensors.

As shown in fig. 7, the first gas sensor 100A is housed in the housing portion a as follows: first, the first base 120A of the first gas sensor 100A is placed on the lower portion of the housing portion a defined by the base 215 and electrically connected to the main body 210, and thereafter, the cover member 220 is attached to the main body 210 such that the upper end of the first gas sensor 100A is housed in the upper portion of the housing portion a defined by the stopper portion 223 of the cover member 220, and at this time, the introduction surface 130A of the upper end of the first gas sensor 100A faces the inner cover 222 of the cover member 220. The introduction surface 130A of the first gas sensor 100A is formed with a gas introduction hole for introducing gas therein, the gas introduction hole facing the inner cover 222 of the cover member 220 and facing the vent hole K1 of the inner cover 222.

As shown in fig. 7, the second gas sensor 100B is placed below the housing portion a defined by the base 215 of the main body 210, and the second base 120B of the second gas sensor 100B is electrically connected to the main body 210. When the first gas sensor 100A and the second gas sensor 100B are placed in the housing portion a, the introduction surface 130B of the second gas sensor 100B is lower than the introduction surface 130A of the first gas sensor 100A in the thickness direction of the gas detector 10, and therefore, a large space is formed between the introduction surface 130B and the inner cover 222. At this time, if the second gas sensor 100B is placed in the housing portion a, the second gas sensor 100B may be displaced vertically in the thickness direction of the gas detector 10, and the detection gas passing through the vent hole K1 may not be efficiently introduced into the second gas sensor 100B from the introduction hole of the introduction surface 130B.

Therefore, as shown in fig. 8, in order to stably house the second gas sensor 100B in the housing portion a and ensure that the detection gas passing through the vent hole K1 of the inner cover 222 can be efficiently introduced into the second gas sensor 100B from the introduction hole of the introduction surface 130B, the second gas sensor 100B is housed in the housing portion a, and then the engagement opening 322 of the spacer 300 is engaged with the base 215 of the main body 210, thereby housing the second gas sensor 100B in the housing portion 320 of the spacer 300. Specifically, after the second gas sensor 100B is placed at the lower portion of the housing portion a, the second surface s2 of the spacer 300 is opposed to the introduction surface 130B, and the introduction surface 130B is brought into contact with the O-ring in the O-ring placement portion 321, thereby housing the second gas sensor 100B in the housing portion 320. Thus, the second gas sensor 100B is stably housed in the housing portion a by the spacer 300, and the communication hole K2 that opens in the second surface s2 of the spacer 300 faces the introduction surface 130B, so that the detection gas can be efficiently introduced into the second gas sensor 100B.

According to the above embodiment, the gas to be detected can be efficiently introduced into different gas sensors 100 to be detected.

6. Gas flow path

The gas flow path of the gas detector 10 in the present embodiment will be described below. The gas detector 10 includes a suction pump P in the gas flow path.

First, the gas to be detected is sucked from the gas inlet 213 into the gas flow path formed by the fitting of the inner lid 222 and the lid main body 221 in the gas detector 10 by the suction pump P. Then, the gas to be detected flowing through the gas flow path passes through the vent hole K1 provided in the inner cover 222 of the cover member 220 and reaches the introduction surface 130A of the first gas sensor 100A. On the other hand, the gas to be detected flowing through the gas flow path reaches the first surface s1 of the spacer 300 through the vent hole K1 provided in the inner cover 222 of the lid member 220, and then reaches the introduction surface 130B of the second gas sensor 100B through the communication hole K2 opened in the first surface s1 of the spacer 300. The gas to be detected flows through the introduction surface 130A of the first gas sensor 100A or the introduction surface 130B of the second gas sensor 100B and is then introduced into the first gas sensor 100A or the second gas sensor 100B, so that the gas to be detected can be detected. Finally, the detected gas is discharged to the outside of the gas detector 10 through the gas outlet 214.

Since the introduction surface 130B of the second gas sensor 100B faces the communication hole K2 of the spacer 300 and the communication hole K2 of the spacer 300 faces the communication hole K1 of the cover member 220, the gas to be detected can smoothly flow into the communication hole K2 from the communication hole K1 and reach the introduction surface 130B of the second gas sensor 100B, and therefore, the gas to be detected flowing through the gas flow path of the cover member 220 can be efficiently introduced into the second gas sensor 100B from the introduction hole of the introduction surface 130B.

The structure of the portable gas detector in the present embodiment has been described in detail, but the present invention is not limited to the above structure, and the structure of the present embodiment may be changed to add or omit individual components without departing from the gist of the present invention.

Claims

1. A portable gas detector comprising a case (200), an operation unit (212), a display unit (211), a control unit, and a plurality of gas sensors (100),

the housing (200) includes:

a main body (210); and

a cover member (220) that is detachable from the main body (210), and that forms a storage space for storing the plurality of gas sensors (100) by combining the main body (210) and the cover member (220),

the housing space has a plurality of housing portions (a) that can house the gas sensors (100) having different shapes.

2. The portable gas detector according to claim 1, further comprising:

and a spacer (300) that can accommodate at least one gas sensor (100) of the plurality of gas sensors (100) and that can abut against the inner surface of the cover member (220).

3. The portable gas detector of claim 2,

the spacer (300) is provided with:

a spacer (310) having a first surface (s1) and a second surface (s2), the first surface (s1) abutting an inner surface of the cover member (220), the second surface (s2) opposing the at least one gas sensor (100); and

a housing (320) in which the at least one gas sensor (100) can be housed in the spacer (300) in such a manner as to abut against the second surface (s 2).

4. The portable gas detector of claim 3,

the spacer (310) has one or more communication holes (K2), the communication holes (K2) penetrating the spacer (310) from a first surface (s1) to a second surface (s2) of the spacer (310).

5. The portable gas detector of claim 4,

the lid member (220) has a lid body (221) and an inner lid body (222),

the cover body (221) is engaged with the inner cover body (222) to form a gas flow path therebetween,

the inner cover (222) has one or more vent holes (K1) that communicate with the gas flow path.

6. The portable gas detector of claim 5,

the plurality of gas sensors (100) includes a first gas sensor (100A) and a second gas sensor (100B),

the first gas sensor (100A) is housed in one of the housing sections (a) so that an introduction surface, in which a gas introduction hole for introducing gas is formed, faces a vent hole (K1) of an inner cover (222) of the cover member (220),

the second gas sensor (100B) is housed in the other housing section (a) such that an introduction surface, in which a gas introduction hole for introducing gas is formed, faces the communication hole (K2) of the spacer section (310) of the spacer (300).

7. The portable gas detector of any of claims 3 to 6,

the accommodating part (320) of the spacer (300) is formed with a clamping opening (322),

the spacer (300) is attached to the housing section (a) through the engagement opening (322).

8. The portable gas detector of any of claims 3 to 6,

the receptacle (320) of the spacer (300) has a sealing element (323),

the sealing member (323) is located between the introduction surface of the at least one gas sensor (100) and the second surface (s2) of the spacer section (310).

9. The portable gas detector of any of claims 3 to 6,

the lid member (220) has: a plurality of stopper portions (223) having the same height, corresponding to the plurality of receiving portions (a), respectively, and vent holes (K1) formed in the plurality of stopper portions (223),

the stopper (223) abuts against the introduction surfaces of the plurality of gas sensors (100) or the first surface (s1) of the spacer (310) of the spacer (300).

10. The portable gas detector of claim 8,

the housing part (320) of the spacer (300) has a plurality of sealing member arrangement parts (321), and the plurality of sealing member arrangement parts (321) can arrange a plurality of sealing members (323) having different shapes.