CN107664589B

CN107664589B - Measuring apparatus

Info

Publication number: CN107664589B
Application number: CN201710377899.2A
Authority: CN
Inventors: 贤持省吾
Original assignee: DKK TOA Corp
Current assignee: DKK TOA Corp
Priority date: 2016-07-29
Filing date: 2017-05-25
Publication date: 2021-12-21
Anticipated expiration: 2037-05-25
Also published as: KR20180013677A; JP2018017666A; CN107664589A; KR102266565B1; JP6586929B2

Abstract

The invention provides a measuring device with high measuring precision. The measurement device is provided with: a measurement unit for collecting particulate matter contained in the atmosphere with filter paper; a collection tube for circulating the air inside and introducing the air into the measurement portion; and a housing to which the measuring section is attached. The measurement unit has: a first member to which a collection tube is connected; and a second member provided to face the first member. The first member and the second member sandwich the filter paper on the surfaces facing each other. One end of the sample atmosphere flow path is open at a position facing the filter paper when the filter paper is sandwiched between the first member and the second member, and extends in a direction intersecting with a normal direction of the surface of the filter paper. The housing has a holding section for holding the measurement section in a posture in which the sample atmosphere flow path is oriented in the vertical direction. The collection tube is formed in a straight line shape and extends in the vertical direction in an internal space formed by communicating with the sample atmosphere flow path.

Description

Measuring apparatus

Technical Field

The present invention relates to a measuring apparatus.

Background

Conventionally, there has been concern about the influence of particulate matter (dust) in the atmosphere on the human body. In japan, environmental standard values and measurement methods for SPM (suspended particulate matter) and PM2.5 (fine particulate matter) are established based on the regulations of the air pollution prevention law (for example, see non-patent document 1).

As an apparatus used for measuring the concentration of the particulate matter in the atmosphere, a measuring apparatus using a β -ray absorption method as a measurement principle is known (for example, see patent document 1). In a conventional measuring apparatus, after collecting particulate matter in the atmosphere taken into the apparatus via a collection tube on a filter paper, the particulate matter concentration (unit: μ g/m) is determined based on the mass of the particulate matter on the filter paper and the volume of sample air³)。

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. Hei 09-127023

Non-patent document

Non-patent document 1: manual for ambient air monitoring 6th edition, [ online ], province of the environment, [2016, 6, 14 th day search ], internet < URL: http:// www.env.go.jp/air/osen/manual _6 th/>

Disclosure of Invention

Problems to be solved by the invention

In the measurement method described in non-patent document 1, which was made in 2009, it is specified that in the measurement of PM2.5, the collection tube should be formed linearly from the sampling port of the collection tube to the filter paper, and the collection tube should not have a bent portion. If the collection tube has a bent portion, when the sample air contacts the inner wall of the collection tube, particulate matter contained in the sample air may adhere to the inner wall of the sample tube, which may reduce measurement accuracy.

In contrast, in the conventional measurement device, a bent portion is provided at a position from the sampling port of the collection tube to the filter paper. This is not an ideal device configuration in terms of sampling of sample air.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a measuring apparatus with high measurement accuracy.

In order to solve the above problem, the present invention provides, in claim 1, a measurement device comprising:

a measurement unit for collecting particulate matter contained in the atmosphere with filter paper;

a collection tube for circulating the atmosphere inside and introducing the atmosphere into the measurement section; and

a housing to which the measuring section is attached,

the measurement unit includes: a first member to which the collection tube is attached; and

a second member provided to be opposed to the first member,

the first member and the second member sandwich the filter paper on the surfaces opposite to each other,

the first member is formed with: a sample atmosphere flow path to which one end of the collection tube is connected; and

a beta-ray irradiation path which is provided so as to intersect with the sample atmosphere channel and through which beta-rays pass,

one end of the sample atmospheric flow path is open at a position facing the filter paper when the filter paper is sandwiched between the first member and the second member, and extends in a direction intersecting with a normal direction of a surface of the filter paper,

The housing has a holding section for holding the measuring section in a posture in which the sample atmosphere flow path is oriented in a vertical direction,

the collection tube is formed in a straight line shape in an internal space formed by communicating with the sample atmosphere passage and extends in a vertical direction.

The invention according to claim 2 is the measuring apparatus according to claim 1, wherein,

the holding part is an inclined surface provided on the housing.

The invention according to claim 3 is the measuring apparatus according to claim 1 or 2, wherein,

the filter paper is in a strip shape,

the measurement device comprises: an unwinding roller that unwinds the filter paper wound in a roll shape to the measurement section;

a take-up roll for taking up the filter paper having the particulate matter collected in the measuring section;

a transport roller that is provided on a transport path of the filter paper set between the unwinding roller and the winding roller and transports the filter paper; and

a control unit for controlling the operation of the unwinding roller and the winding roller,

the conveying roller is provided with a detection mechanism for detecting the rotation angle of the conveying roller,

the control unit controls the unwinding length of the filter paper based on the rotation angle detected by the detection mechanism.

The invention according to claim 4 is the measuring apparatus according to any one of claims 1 to 3, wherein,

a calibration member detachably inserted between the first member and the second member so as to overlap one end of the sample atmosphere channel in the measurement unit,

the measuring unit has a columnar member connecting the first member and the second member,

the columnar members are provided on both sides of one end of the sample atmosphere flow path with one end of the sample atmosphere flow path interposed therebetween,

the calibration member has an equivalent film and a frame body holding the equivalent film,

the frame body has: a first notch portion provided at a peripheral edge portion; and

a second notch portion provided on the peripheral edge portion on the opposite side of the first notch portion with the dummy film interposed therebetween,

the length of a line segment connecting the center of the virtual circle stored in the first notch and the point of contact between the virtual circle stored in the second notch and the second notch is always larger than the length of a line segment connecting the center and an arbitrary point on the peripheral edge from the first notch to the point of contact.

According to the present invention, a measurement device with high measurement accuracy can be provided.

Drawings

Fig. 1 is a schematic perspective view showing a measurement device 1 according to an embodiment.

Fig. 2 is a partially enlarged view of the measuring apparatus 1.

Fig. 3 is a schematic cross-sectional view showing the peripheral structure of the measurement unit 10 of the measurement device 1.

Fig. 4 is a diagram showing the calibration member 70.

Fig. 5 is an explanatory diagram showing a method of using the calibration member 70.

Fig. 6 is an explanatory diagram showing a method of using the calibration member 70.

Fig. 7 is an explanatory diagram showing a method of using the calibration member 70.

Description of the symbols:

an assay device;

a measuring portion;

a first component;

faces

11a, 12 a.;

a second component;

a guide bolt (cylindrical member);

a collection tube;

20x, 111x, 112x, 121x, 122x.. one end;

a basket body;

a holding portion;

an unwinding roller;

a wind-up roll;

a control portion;

a calibration component;

71.. equivalent membrane;

a frame;

a peripheral edge portion;

111. a sample atmospheric flow path;

112. a beta ray irradiation path;

a first incision portion;

a second cut-out portion;

filter paper;

s.. an interior space;

VC1, vc2.. virtual circle;

P1.. center;

p2.. tangent point;

p3.. from the first incision portion to an arbitrary point on the peripheral edge portion of the tangent point;

p4. from the tangent point to a point on the peripheral edge of the locking portion.

Detailed Description

[ embodiment 1 ]

Hereinafter, a measurement device according to an embodiment of the present invention will be described with reference to fig. 1 to 7. In all the drawings described below, the dimensions, proportions, and the like of the respective components are appropriately adjusted for easy viewing of the drawings, and the dimensions, proportions, and the like of the respective components are not identical.

In the following description, an xyz rectangular coordinate system is set, and the positional relationship of each member is described with reference to the xyz rectangular coordinate system. Here, a predetermined direction in the horizontal plane is referred to as an x-axis direction, a direction orthogonal to the x-axis direction in the horizontal plane is referred to as a y-axis direction, and a direction orthogonal to each of the x-axis direction and the y-axis direction (i.e., a vertical direction) is referred to as a z-axis direction. That is, in the present specification, the horizontal direction is the xy plane direction in the drawing, and the vertical direction is the z axis direction in the drawing.

Fig. 1 is a schematic perspective view showing a measurement device 1 according to the present embodiment. Fig. 2 is a partially enlarged view showing the measurement device 1.

As shown in fig. 1 and 2, the measurement device 1 of the present embodiment includes: a measurement unit 10, a collection tube 20, a casing 30, a conveyance unit 40, and a control unit 50. The measurement device 1 is a measurement device that can determine the concentration of particulate matter in the atmosphere, for example, using a β -ray absorption method as a measurement principle.

The measurement unit 10 collects the particulate matter contained in the atmosphere with filter paper F. The measurement unit 10 is provided with a collection tube 20.

The measurement unit 10 includes: a first member 11 to which collection tube 20 is attached, and a second member 12 disposed opposite first member 11. The first member 11 and the second member 12 are each a member having an outer shape of a substantially rectangular parallelepiped. The first member 11 and the second member 12 face each other on the surface 11a and the surface 12a, respectively.

The first member 11 and the second member 12 are connected by two guide bolts (columnar members) 19. The guide bolt 19 penetrates the first member 11 and the second member 12 at a position diagonally opposite to the surface 11a and the surface 12a, and screws the first member 11 and the second member 12 together. The guide bolts 19 are provided on both sides of one end 111x of the sample atmosphere flow path 111 with the one end 111x of the sample atmosphere flow path 111 described later interposed therebetween.

The first member 11 and the second member 12 are configured to change the relative distance therebetween by adjusting the fastening manner of the guide bolt 19. Thus, the first member 11 and the second member 12 can sandwich the filter paper F between the facing surfaces (the

surfaces

11a and 12a) thereof.

The collecting tube 20 is a tubular member that circulates the air inside and introduces the air into the measurement unit 10. In this embodiment, collection tube 20 has an adapter 28 at the end. Collection tube 20 is mounted to first component 11 by adapter 28.

Collection tube 20 is, for example, a cylindrical member made of stainless steel. The collection tube 20 may be a simple cylindrical member, or may be a part of a dehumidifier for dehumidifying the atmosphere flowing inside or a heater for heating the atmosphere.

The housing 30 houses piping, pumps, wiring, and the like, which are not shown. The housing 30 has a holding portion 31 to which the measuring unit 10 is attached. The holding portion 31 is an inclined surface inclined with respect to the horizontal direction.

Normally, the measuring unit 10 is housed inside the casing 30. In fig. 1, a part of the structure of the housing 30 is abstracted and shown by a dotted line. The casing 30 may be provided with an operation window for operating the structure of the received measurement unit 10 and the like.

The transport unit 40 transports the strip-shaped filter paper F. According to the principle of measurement, the measurement may be continued by replacing a single filter paper after the measurement by the measuring apparatus is completed, or the continuous operation may be maintained by moving the position of the filter paper F after the measurement is completed.

The conveying section 40 includes: an unwinding roller 41 that unwinds the filter paper F wound in a roll shape to the measuring section 10, and a winding roller 42 that winds the filter paper F having collected the particulate matter in the measuring section 10. Further, conveying

rollers

43 and 44 are provided on a conveying path of the filter paper F set between the unwinding roller 41 and the winding roller 42. In the figure, in a field of view from the normal direction of the holding portion 31 which is an inclined surface, an unwinding roller 41 and a conveying roller 43 are provided on one side and a winding roller 42 and a conveying roller 44 are provided on the other side with the measuring portion 10 interposed therebetween.

The filter paper F unwound from the unwinding roller 41 is wound around the winding roller 42 via the space between the first member 11 and the second member 12 of the measuring unit 10. The filter paper F used in the measuring unit 10 is moved in position by the unwinding roller 41 and the winding roller 42 every time the measurement is completed.

At least one of the conveying roller 43 and the conveying roller 44 is preferably provided with a detection mechanism, not shown, for detecting a rotation angle of the detection mechanism. Thus, the unwinding length of the filter paper F can be controlled based on the detected rotation angle and the diameter of the roller having the detection mechanism. In the figure, the conveying roller 43 has a detection mechanism for detecting its own rotation angle, and outputs the detection result to the control unit 50.

The control unit 50 calculates the concentration of the particulate matter in the atmosphere based on the amount of the particulate matter collected by the measurement unit 10. The calculated value is displayed on the display unit 59, for example.

Further, the detection result obtained by the detection means for detecting the rotation angle of the conveying

roller

43 or 44 is input to the control unit 50, and the control unit 50 controls the operation of the unwinding roller 41 or the winding roller 42 based on the detection result. In the figure, the detection result of the rotation angle of the conveying roller 43 detected by the detection mechanism of the conveying roller 43 is input to the control unit 50, and the control unit 50 controls the operation of the wind-up roller 42 based on the detection result.

The control unit 50 may control the operation of the suction pump 29, which will be described later.

Fig. 3 is a schematic cross-sectional view showing the peripheral structure of the measurement unit 10 of the measurement device 1. As shown in the drawing, the first member 11 is provided with a sample atmosphere passage 111 and a β -ray irradiation passage 112.

One end 20x of the collection tube 20 is connected to the sample atmosphere channel 111. One end 111x of the sample atmosphere channel 111 is open at a position facing the filter paper F when the filter paper F is sandwiched between the first member 11 and the second member 12. The sample atmosphere channel 111 extends in a direction intersecting with the normal direction of the surface of the filter paper F, in other words, in a direction intersecting with the normal direction of the surface 11 a.

The sample atmosphere channel 111 communicates with the collection tube 20, and a space (internal space S) surrounded by the inner wall 111a of the sample atmosphere channel 111 and the inner wall 20a of the collection tube 20 is formed linearly from one end 111x of the sample atmosphere channel 111 to the other end 20y of the collection tube 20. Here, the phrase "formed linearly" means that the collection tube 20 and the sample atmosphere channel 111 are not bent or curved.

In this case, for example, it is assumed that there is a virtual line L connecting the center of the opening at the other end 20y of the collection tube 20 and the center of the opening at the one end 111x of the sample atmosphere channel 111, and the virtual line L does not contact the inner wall 111a of the sample atmosphere channel 111 or the inner wall 20a of the collection tube 20.

Since the internal space S formed by the sample atmosphere channel 111 and the collecting tube 20 is linear, the granular substances contained in the atmosphere collected from the collecting tube 20 are less likely to collide with the inner wall 111a of the sample atmosphere channel 111 or the inner wall 20a of the collecting tube 20, and are easily collected by the filter paper F. This can reduce measurement errors.

The β -ray irradiation path 112 is a space through which the β -ray passes, and is provided so as to intersect the sample atmosphere channel 111. One end 112x of the β -ray irradiation path 112 is open to the side wall of the sample atmosphere channel 111, and a β -ray transmitting film 115 is provided. A β -ray source 60 is provided at the other end 112y of the β -ray irradiation path 112.

In addition, the second member 12 is provided with a sample atmosphere channel 121 and a β -ray irradiation path 122.

In fig. 3, one end 121x of the sample atmosphere channel 121 is open at a position facing the filter paper F when the filter paper F is sandwiched between the first member 11 and the second member 12. The sample atmosphere channel 121 extends in a direction intersecting with the normal direction of the surface of the filter paper F, in other words, in a direction intersecting with the normal direction of the surface 12 a.

The other end 121y of the sample atmosphere channel 121 is connected to the suction pump 29 via a pipe. The suction pump 29 is controlled by a control unit (see fig. 1 and 2) not shown. The operation of the suction pump 29 may be controlled by the control unit based on the measurement value of a flow meter provided in the sample atmosphere flow path 121.

The β -ray irradiation path 122 is a space through which the β -ray passes, and is provided so as to intersect the sample atmosphere channel 121. One end 122x of the β -ray irradiation path 122 is open to the side wall of the sample atmosphere channel 121, and a β -ray transmitting film 125 is provided. At the other end 122y of the β -ray irradiation path 122, the detector 61 is provided.

The measuring unit 10 is held by the holding unit 31. The holding unit 31 holds the measurement unit 10 in a posture in which the sample atmosphere flow path 111 is oriented in the vertical direction.

In the measurement device 1 having the above-described configuration, the suction pump 29 is activated in a state where the filter paper F is sandwiched between the first member 11 and the second member 12, and the atmospheric air containing the granular substances is introduced into the measurement unit 10 through the collection tube 20. In the measurement unit 10, the particulate matter contained in the atmosphere is deposited on the filter paper F.

In the measurement apparatus 1, the particulate matter deposited on the filter paper F is irradiated with the β -ray emitted from the β -ray source 60. The beta rays are irradiated to the particulate matter deposited on the filter paper F through the beta ray irradiation path 112 and the beta ray transmission film 115. The beta rays are detected by the detector 61 through the beta ray transmitting film 125 and the beta ray irradiation path 122.

The controller 50 determines the concentration of particulate matter in the atmosphere by a known β -ray absorption method using the β -ray intensity measured by the detector 61.

In the conventional measurement device, the internal space S formed by the collection tube 20 communicating with the sample atmosphere passage 111 is not formed linearly for the following reason, and therefore, ideal measurement cannot be performed.

First, the first reason is that the conventional measurement device is configured based on a relationship with another measurement device.

In a conventional measuring apparatus, other measuring apparatuses for measuring air pollutants other than particulate matter are stacked, and a collecting tube is attached to a back surface or a side surface of the apparatus, not to an upper surface of the apparatus, in order to reduce an installation area of the entire measuring apparatus. Therefore, if the sampling port of the collection tube is directed upward in the vertical direction, the configuration is: at the entrance of the device body, a local bending of the collection tube.

The second reason is that the conventional measurement device is configured to ensure the measurement accuracy by the β -ray absorption method.

In the conventional measurement device, a means for holding a filter paper for collecting particulate matter is provided as in the measurement unit 10 of the measurement device 1 of the present embodiment. In this unit, as in the measurement unit 10, a β -ray irradiation path through which the β -ray irradiated from the β -ray source passes is provided as a structure for irradiating the particulate material collected by the filter paper with the β -ray.

In the measurement device having the above-described configuration, if the distance from the β -ray source to the particulate matter on the filter paper is large, the measurement accuracy may be reduced. Therefore, in the conventional measurement device, the β -ray irradiation path is formed so that the β -ray can be irradiated from the normal direction as much as possible to the surface of the filter paper located at the position where the particulate matter is collected in the cell.

In the unit designed based on the above technical idea, the collection tube for introducing the sample air into the filter paper is provided at a position not interfering with the β -ray source and the β -ray irradiation path. The structure of the collection tube is therefore: the filter paper surface at the position of collecting the particulate matter in the cell is connected to the cell from a direction intersecting with a normal line of the filter paper surface. The sample atmosphere flow path connected to the collection tube in the cell has a structure in which: is disposed so as to intersect the beta ray irradiation path.

The structure having the unit has a high affinity with the structure of the measurement device for the first reason. Therefore, as a configuration satisfying the first and second reasons, a configuration in which a collection tube is provided on a side surface of a measurement device has been used for a long time, and the device configuration is formed as follows: a bending part is arranged between the sampling port of the collecting pipe and a certain position of the filter paper, and the inner space of the collecting pipe is bent.

In contrast, in the measurement device 1 of the present invention, the measurement unit 10 is provided with the sample

atmosphere flow paths

111 and 121 and the β -

ray irradiation paths

112 and 122, and the measurement unit 10 is held by the holding unit 31 so that the sample atmosphere flow path 111 is oriented in the vertical direction, in the same technical idea as that of the measurement device having the conventional configuration. When the collecting tube 20 is connected to the measurement unit 10 held in this manner, the internal space S formed by the sample atmosphere channel 111 and the collecting tube 20 becomes a straight line. This enables the measurement device 1 to perform an ideal measurement.

The measurement device 1 of the present embodiment performs sensitivity calibration during measurement using an equivalent membrane attached to the device. Fig. 4 is a diagram showing the calibration member 70.

As shown in the drawing, the alignment member 70 attached to the measurement device 1 of the present embodiment includes an equivalent film 71 and a frame 72.

The equivalent film 71 is a synthetic resinous film having a mass corresponding to a specific unit area and used as a reference for mass per unit area. In the calibration, the intensity of the transmitted β -ray when only the filter paper was irradiated with the β -ray and the intensity of the transmitted β -ray when the filter paper was placed on an equivalent film and irradiated with the β -ray were measured. Then, a span calibration is performed based on these measurement values.

The frame 72 is a member that holds the equivalent membrane. The frame 72 has: a first notch 701 provided in the peripheral edge 72a of the frame 72, a second notch 702 provided in the peripheral edge 72a on the opposite side of the first notch 701 with the dummy film 71 interposed therebetween, and a convex locking portion 703 adjacent to the second notch 702.

As described later, the alignment member 70 is used so that the first notch 701 and the second notch 702 are in contact with the guide bolt 19 of the measuring unit 10. In order to facilitate the installation of the alignment member 70 used in this manner, the shape of the alignment member 70 is based on the following idea.

First, the first slit part 701 is provided in a hook shape. Specifically, the first notch 701 has a size capable of receiving a circle (virtual circle VC1) having the same diameter as the guide bolt 19. In the figure, at the first slit part 701, the curvature of the inner side bent into a hook shape is not smaller than the curvature of the virtual circle VC 1.

On the other hand, the second notch 702 is a recess provided in the peripheral edge portion 72a on the opposite side of the first notch 701 with the dummy film 71 interposed therebetween, and is sized to receive a circle (virtual circle VC2) having the same diameter as the guide bolt 19.

Here, the center of a virtual circle VC1 assumed to be accommodated in the first cutout part 701 in the alignment member 70 is set as the center P1.

A contact point between a virtual circle VC2 assumed to be accommodated in the second notch 702 and the peripheral edge 72a of the second notch 702 is defined as a contact point P2.

An arbitrary point on the peripheral edge portion 72a from the first notch portion 701 to the tangent point P2 is defined as a point P3.

Note that an arbitrary point from the tangent point P2 to the peripheral edge 72a of the locking portion 703 is a point P4.

At this time, the length of the line segment a connecting the center P1 and the tangent point P2 is defined as a length La, and the length of the line segment B connecting the center P1 and the point P3 is defined as a length Lb, and the alignment member 70 of the present embodiment is provided in such a manner that: the length La and the length Lb always satisfy the length La > the length Lb.

Further, assuming that the length of the line segment C connecting the center P1 and the point P4 is the length Lc, the alignment member 70 of the present embodiment is provided in the following manner: the length La and the length Lc satisfy the condition that the length La is less than the length Lc.

The calibration member 70 is used as follows. Fig. 5 to 7 are explanatory views showing a method of using the calibration member 70. In fig. 5 and 7, the measurement device 1 has an operation window for operation in the casing, and performs operations around the measurement unit 10 through the operation window.

First, as shown in fig. 5, the guide bolt 19 is loosened to form a gap between the first member 11 and the second member 12 of the measuring unit 10. Next, the first notch 701 of the alignment member 70 is hooked on the guide bolt 19a on one side (upper side) so that the dummy film 71 is positioned below, and the hand is released.

The guide bolt 19 is installed obliquely with respect to the horizontal direction. Therefore, when the hand is released from the alignment member 70, the alignment member 70 is pulled in the direction of gravity and rotates about the first notch 701 as shown in fig. 6.

As shown in fig. 6 and 7, the rotating alignment member 70 stops rotating when the second notch 702 abuts the other (lower) guide bolt 19 b.

At this time, as shown in fig. 4, the alignment member 70 is shaped so as to always satisfy the length La > the length Lb, and therefore the peripheral edge portion 72a other than the second notch portion 702 in the middle of rotation does not come into contact with the guide bolt 19 b. Further, since the alignment member 70 is shaped so as to satisfy the length La < the length Lc, the alignment member 70 does not rotate beyond the locking portion 703 but reliably abuts against the guide bolt 19b through the second notch portion 702. Thereby, the alignment member 70 is disposed in a state of being abutted against the two guide bolts 19.

In the measurement unit 10, one end 111x of the sample atmosphere channel 111 is open between the two guide bolts 19. Therefore, the filter paper F held by the measurement unit 10 can collect the particulate matter between the two guide bolts 19.

On the other hand, when the calibration member 70 is disposed in the measurement unit 10 as described above, the dummy film 71 provided between the first notch portion 701 and the second notch portion 702 overlaps with the position where the particulate matter is collected in the measurement unit 10. Therefore, the measurement device 1 including the calibration member 70 is relatively easy to calibrate and easily ensures measurement accuracy.

In addition, the structure may be: in a region including a portion of the surface 12a of the second member 12 where the filter paper F is disposed, a groove-like recess having a depth larger than the thickness of the filter paper F and crossing the second member 12 along the filter paper F is formed, and the filter paper F is in contact with the bottom surface of the recess. In the above configuration, if the filter paper F is disposed so as to contact the bottom surface of the recess, the filter paper F is not exposed in the gap between the surface 11a of the first member 11 and the surface 12a of the second member 12. On the other hand, the alignment member 70 is inserted into the gap between the surface 11a of the first member 11 and the surface 12a of the second member 12 and is disposed in contact with the two guide bolts 19, and therefore is located in the gap between the surface 11a of the first member 11 and the surface 12a of the second member 12.

Therefore, in the measuring apparatus having the configuration in which the concave portion is provided, the position of the filter paper F does not change due to the contact of the alignment member 70 with the filter paper F when the alignment is performed using the alignment member 70, and the deterioration of the repeatability of the equivalent membrane alignment due to the position change of the filter paper F can be prevented.

According to the measuring apparatus 1 having the above-described configuration, a measuring apparatus with high measurement accuracy can be obtained.

While preferred embodiments of the present invention have been described above with reference to the drawings, it is needless to say that the present invention is not limited to the above embodiments. The shapes, combinations, and the like of the respective constituent members shown in the above examples are examples, and various modifications can be made based on design requirements and the like without departing from the scope of the present invention.

Claims

1. A measurement device is characterized by comprising:

a measuring part for collecting the particulate matter contained in the atmosphere with filter paper,

a collection tube for circulating the atmosphere therein and introducing the atmosphere into the measurement section, and

a housing to which the measurement unit is attached;

the measurement unit includes: a first component to which the collection tube is attached, an

A second member provided to face the first member;

the first member is formed with: a sample atmosphere flow path to which one end of the collection tube is connected, and

the collecting tube is formed in a straight line shape in an internal space formed by communicating with the sample atmosphere passage and extends in a vertical direction,

The measurement unit has a calibration member that is detachably inserted between the first member and the second member so as to overlap one end of the sample atmosphere channel,

the alignment member has an equivalent film and a frame body holding the equivalent film,

2. The assay device according to claim 1,

the holding part is an inclined surface provided on the housing.

3. The assay device according to claim 1 or 2,

the filter paper is in a strip shape,

the measurement device comprises: an unwinding roller that unwinds the filter paper wound in a roll shape to the measuring section,

a take-up roll for winding the filter paper having the particulate matter collected in the measuring section,

a conveying roller that is provided on a conveying path of the filter paper set between the unwinding roller and the winding roller and that conveys the filter paper, an

A control unit that controls the operation of the unwinding roller and the winding roller;