JPWO2009034897A1 - Gas concentration measuring instrument - Google Patents

Abstract

The cassette (12) for storing the gas detection tape (16) includes a cassette body (21) and a cover plate (22) that covers the back surface of the cassette body (21). The cassette body (21) contains an unused detection paper storage section (24) for storing unused gas detection tape (16), and a used detection paper storage for storing used gas detection tape (16). Section (25), a detection paper passage (26) connecting these storage sections (24, 25), and an exposure section (43) for exposing a part of the detection paper passage (26) to the outside of the cassette. Is formed. The periphery of the unused detection paper storage unit (24) is sealed by an O-ring (80), and the passage portion upstream of the exposure unit (43) includes a sealing means (85), a rotating body (71), and a sealing unit (96 ) Etc.

Description

  The present invention relates to a gas concentration measuring device for measuring the concentration of a specific type of gas such as ozone gas or nitrogen dioxide gas contained in air.

At present, air pollution due to NOx, SPM, and photochemical oxidants occurs, and the influence on the environment has become a major problem. Ozone gas (O ₃ ), the main component of photochemical oxidants, is generated when pollutants such as NOx and hydrocarbons emitted from factories, offices, and automobiles undergo photochemical reactions when exposed to sunlight. Causes photochemical smog. In various devices including corona discharge means, such as electrostatic copying machines, laser printers, and LED facsimiles, ozone gas and NOx gas are generated during the operation of the corona discharge means. Since such ozone gas has a strong oxidizing ability, if its concentration in the air exceeds a certain level (0.1 ppm) due to its own toxicity, it stimulates the respiratory system and is harmful if inhaled for a long time even in trace amounts. It is said that. In addition, NOx gas is a causative substance of air pollution, and a relationship with respiratory diseases has been pointed out.

  For this reason, it is necessary to monitor the environment by investigating the concentration distribution of ozone gas and NOx gas, evaluating the influence on the local environment, and evaluating the influence of personal ozone gas and NOx gas exposure. For this reason, various ozone concentration measuring devices have been developed for ozone gas that are inexpensive, small and light, and can be used at an individual or household level. For example, there are known ozone concentration measuring devices disclosed in JP 2004-144729 A, WO 2006/06623 (PCT / JP2005 / 014689), JP 09-274032 A, JP 2000-081426 A, and the like. ing.

  FIG. 14 shows an example of a conventional ozone concentration measuring device. The ozone concentration measuring instrument 1 has a gas detection element 2 having an exposed portion 3 that changes color (discolors) when exposed to ozone gas, and a color chart 5 indicating a color (color sample) corresponding to the concentration of ozone gas. A mount 4 is provided. The gas detection element 2 is fixed to the mount 4 along the color chart 5.

  The gas detection element 2 is usually produced by impregnating a cellulose filter paper with a detection solution prepared by adding a dye, a humectant, an acid, water or the like that changes color when it reacts with ozone gas, and then air drying. Indigo dyes, azo dyes, triphenylmethane dyes, anthraquine dyes and the like are used as the dyes that change color when reacted with ozone gas.

  The mount 4 is preferably made of the same material as that of the normal gas detection element 2. The color chart 5 includes three color samples 5a to 5c corresponding to different ozone concentrations, for example, 0 ppb, 400 ppb, and 800 ppb. The color sample 5a having an ozone concentration of 0 ppb has the same color (indigo carmine: indigo) as the exposed portion 3 of the gas detection element 2 before measurement. On the other hand, the color samples 5b and 5c having higher gas concentrations are faded.

  When such an ozone concentration measuring device 1 is used for a certain period of time (for example, 8 hours) in an environment where ozone gas is present, the exposed portion 3 of the gas detection element 2 is changed in color by being exposed to ozone gas. By comparing this discolored color with the color samples 5a to 5c of the color chart 5, the concentration of ozone gas can be known. That is, when the exposed portion 3 changes color and fades to a color substantially equal to the 400 ppb color sample 5b, it is determined that the ozone concentration is 400 ppb, and when the color fades to a color substantially equal to an intermediate color between 400 ppb and 800 ppb. It is determined that the ozone concentration is 600 ppb.

However, since the conventional ozone concentration measuring instrument 1 described above is formed in a card shape, it has to be replaced with a new one for each measurement and cannot be used continuously. It was.
Further, when storing, the exposed portions 3 of the gas detection element 2 are stored one by one in a sealed container such as aluminum so as not to touch the outside air. For this reason, there is a problem that it is necessary to take out the sealed container every time the measurement is performed, and the labor is troublesome.

  The present invention has been made in order to solve the above-described conventional problems, and the object of the present invention is to measure the gas concentration, which is easy to handle and allows continuous measurement while maintaining the sealing required for storage. Is to provide a vessel.

  In order to achieve the above object, the present invention changes color when a cassette having a cassette body, a cover plate covering the back of the cassette body, and wound in a roll shape is stored in the cassette and reacts with a specific gas. A tape-shaped gas detection paper and a detection paper take-up means for winding the gas detection paper, and the cassette stores the unused gas detection paper formed on the back surface of the cassette body A detection paper storage unit, a used detection paper storage unit for storing the used gas detection paper, a detection paper path connecting the unused detection paper storage unit and the used detection paper storage unit, and the cassette An unused portion formed between an exposed portion formed on an upper surface of the main body and exposing a part of the passage for the detection paper to the outside of the cassette, and the cassette main body and the cover plate. A seal member that hermetically seals the periphery of the storage unit; and a seal unit that is provided in a passage portion upstream of the exposed portion of the detection paper passage and presses the gas detection paper against a wall surface of the upstream passage portion. It is.

  In the gas concentration measuring apparatus according to the present invention, the unused detection paper storage section and the passage portion upstream of the detection paper passage exposure section are hermetically sealed, so that the unused gas detection paper is placed outside the cassette. It is not exposed to the atmosphere. Therefore, it is not necessary to store the gas detection paper sealed in an aluminum packaging bag, and the gas detection paper can be easily stored and handled. Further, since the gas detection paper is formed in a tape shape and wound in a roll shape, the gas detection paper can be continuously used by being wound by the detection paper winding means.

  Further, in the present invention, as the detection paper winding means, a winding rotary member rotatably disposed in the used detection paper storage unit, and the winding rotary member are rotated when the gas detection paper is wound. You may comprise with a drive motor.

  In the present invention, it is desirable to further include a detection paper feed amount detecting means for detecting the feed amount of the gas detection paper.

  In the present invention, the detection paper feed amount detection means may be constituted by a rotating body that is rotated by the gas detection paper when the gas detection paper is traveling, and a sensor that detects the rotation of the rotating body.

  In the present invention, the rotating body may have a sealing function for sealing the detection paper path by pressing the gas detection paper against the wall surface of the detection paper path.

  In the present invention, at least one of a desiccant and an oxygen scavenger may be further stored in the unused detection paper storage unit.

  In the present invention, a sealing portion for sealing the open side surface of the detection paper passage may be further provided on the joint surface between the cassette body and the cover plate.

  Further, in the present invention, a pre-processing unit that preliminarily adjusts the next measurement portion of the gas detection paper to the humidity of the measurement environment in the upstream passage portion from the exposed portion of the detection paper passage, and this pre-processing portion is selected as the atmosphere. A shutter that opens automatically may be provided.

  In the present invention, the pre-processing unit may have an opening that opens on the upper surface of the cassette, and a shutter may be slidably provided on the upper surface of the cassette to open and close the opening.

  In the present invention, the cover plate has a communication hole that communicates with the pretreatment section, the shutter has a vent hole, and is provided rotatably on the cover plate. The pretreatment section is provided via the communication hole and the vent hole. May be opened to the atmosphere.

  Moreover, in this invention, while providing a partition wall between an exposure part and a pre-processing part, you may further provide the press means which presses a gas detection paper to the lower surface of this partition wall.

  Further, in the present invention, the pretreatment unit is opened to the atmosphere by operating the shutter for a predetermined time before the next measurement unit waiting for the gas detection paper pretreatment unit is sent to the exposure unit for measurement. You may do it.

  Further, in the present invention, a pre-processing unit that preliminarily adjusts the next measurement portion of the gas detection paper to the passage portion upstream from the exposure portion of the detection paper passage, and a specific gas covering the opening of the pre-processing unit. A filter that removes moisture and allows moisture to pass therethrough may be further provided.

  In the present invention, the pretreatment unit may be communicated with the outside through an opening that opens to the front and back of the cassette body and an opening formed in the cover plate.

  Furthermore, in the present invention, the specific gas detected by the gas detection paper may be ozone gas, and the filter may be any one of an ozone filter that removes ozone gas and a membrane filter.

FIG. 1 is an exploded perspective view showing a first embodiment in which the present invention is applied to an ozone concentration measuring device. FIG. 2 is a rear view of the cassette body. FIG. 3 is a cross-sectional view of an ozone concentration measuring device. FIG. 4 is a perspective view of the gas detection tape. FIG. 5A is a diagram illustrating a state in which the amount of gas detection paper feed detected by the detection paper feed amount detection unit is detected. FIG. 5B is a diagram illustrating a state in which the detection amount of the gas detection paper is detected by the detection paper supply amount detection unit. FIG. 6 is a rear view of the cassette body showing the second embodiment of the present invention. FIG. 7 is an exploded perspective view of an ozone concentration measuring device showing a third embodiment of the present invention. FIG. 8 is a rear view of the cassette body. FIG. 9 is a rear view showing a part of the gas concentration measuring apparatus according to the fourth embodiment of the present invention, with a part thereof broken. FIG. 10 is an exploded perspective view of an ozone concentration measuring device showing the form of the fifth embodiment of the present invention. FIG. 11 is a rear view of the cassette body. 12 is a cross-sectional view taken along line XII-XII in FIG. FIG. 13 is a perspective view of an essential part of an ozone concentration measuring device showing a sixth embodiment of the present invention. FIG. 14 is a perspective view showing a conventional example of an ozone concentration measuring device.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[First embodiment]
1 to 3 show an example in which the present invention is applied to an ozone concentration measuring device 10 that automatically measures the concentration of ozone gas in the atmosphere by remote operation. Further, the ozone concentration measuring device 10 shows the measuring device according to claim 1, and includes a gas detection paper 11 housed in a cassette 12, a detection paper winding means 13 for winding the gas detection paper 11, Gas concentration measuring means 14 for measuring the ozone concentration is provided.

  In FIG. 4, a gas detection paper 11 is impregnated in a tape-like carrier, for example, cellulose filter paper, with a detection solution containing a dye that changes color (fading or color development) when exposed to ozone gas and changes the absorption in the visible region. The impregnated solution is dried and the whole is used as an exposed portion to form a tape.

  As the detection solution, an aqueous solution in which a dye (for example, indigo ring) that changes color when exposed to ozone gas, an acid (for example, citric acid), and a humectant (for example, glycerin) is used. Examples of the dye having an indigo ring include indigo, indigo carmine sodium salt, indigo carmine potassium salt, and indigo red. As the acid, citric acid, acetic acid, phosphoric acid, tartaric acid and the like can be used. The acid is used to keep the pH of the sensing solution in the range of 2-4. As the humectant, glycerin, ethylene glycol, propylene glycol, or the like can be used.

  In the present invention, an example in which indigo carmine is used as an indigo ring that fades when exposed to ozone gas is shown. Indigo carmine is an acidic dye called Blue No.2. For this reason, the detection solution using indigo carmine is an aqueous solution exhibiting blue to blue-violet. The color of the detection solution can be confirmed visually. Moreover, the detection solution exhibits acidity by addition of an acid. The gas detection paper 11 formed with such a detection solution has an indigo color.

  In the specific production of the gas detection paper 11, for example, 0.05 g of indigo carmine, 3.0 g of citric acid as an acid, and 15 g of glycerin as a humectant are placed in a container, and water is added to these. Is added to dissolve indigo carmine to prepare 50 g of detection solution.

  Next, cellulose filter paper (for example, filter paper No. 2 manufactured by Advantic Co., Ltd.) is dipped in this detection solution and taken out for a predetermined time, and then water contained in the cellulose filter paper is evaporated by air drying. Thereby, the indigo gas detection paper 11 is completed.

  The gas detection paper 11 thus produced was exposed to a test gas containing ozone gas from an ozone gas generator for a certain time (for example, 10 minutes), and the degree of discoloration was observed with the naked eye. The ozone gas contained in the test gas is taken into the moisture retained by the glycerin of the gas detection paper 11 and then causes a reaction to decompose the C = C double bond of the dye having an indigo ring. Due to this decomposition reaction, the structure and electronic state of the dye molecules change, and the color (blue) of the gas detection paper 11 becomes light (discolors). When the faded gas detection paper 11 is irradiated with visible light, the absorption of light changes at a wavelength of 610 nm to 620 nm (orange region) (increased reflectance).

  As shown in FIG. 4, the gas detection paper 11 is fixed to the surface of the flexible resin transport tape 15 and is used in a state of being wound around the winding core 17 in a roll shape. Hereinafter, the tape formed of the gas detection paper 11 and the transport tape 15 and wound around the winding core 17 is referred to as a gas detection tape 16. The gas detection tape 16 has a length of about 10000 mm, a width of 10 mm, and a thickness of about 0.2 mm, for example, and is loaded into the cassette 12 while being wound around the winding core 17.

  1 to 3, the cassette 12 includes a cassette body 21 and a cover plate 22. The set main body 21 is formed in a horizontally long and thin box shape by a front plate portion 21a, a back plate portion 21b, an upper plate portion 21c, a bottom plate portion 21d, and left and right side plate portions 21e and 21f.

On the back surface S ₂ of the cassette body 21, an unused detection paper storage unit 24 that stores unused gas detection paper 11, a used detection paper storage unit 25 that stores used gas detection paper, and a detection paper A passage 26, four screw holes 27, and a recessed portion 32 are formed. The unused detection paper storage unit 24 and the used detection paper storage unit 25 are formed of circular recesses having the same size and different depths, and are connected by a detection paper passage 26.

  The unused detection paper storage unit 24 is formed sufficiently deeper than the width of the gas detection tape 16, so that the first storage space 24 </ b> A for storing the desiccant 28 (FIG. 3) and the unused gas detection are stored. And a second storage space 24B for storing the tape 16 for use. The desiccant 28 is stored in the first storage space 24A, and is fixed to the back wall 24a of the storage unit 24 by a partition plate 29 made of a perforated plate. The desiccant 28 absorbs moisture in the atmosphere, thereby preventing the unused gas detection paper 11 from getting wet and fading. As the desiccant 28, for example, silica gel, calcium chloride, a polymer water-absorbing polymer, or the like is used.

  Further, instead of the desiccant 28 or in addition to the desiccant 28, the oxygen absorber may be stored in the first storage space 24A. The oxygen scavenger contains chemicals such as iron and organic substances that themselves oxidize and consumes the surrounding oxygen, absorbs oxygen in the atmosphere as much as possible, and prevents the gas detection paper 11 from fading due to oxygen during long-term storage. To do. As the oxygen scavenger, for example, AGELESS (trade name manufactured by Mitsubishi Gas Chemical Company) is used.

  In addition, a shaft mounting portion 30 (FIG. 3) having a protruding height substantially equal to the depth of the first storage space 24A is integrally provided at the center of the back wall 24a of the unused detection paper storage portion 24. Further, a shaft 31 is integrally projected on the tip surface of the shaft mounting portion 30, and the winding core 17 of the gas detection tape 16 is rotatably fitted to the shaft 31. The shaft 31 is set to have a diameter smaller than the outer diameter of the shaft mounting portion 30 and the hole diameter of the winding core 17. The outer peripheral portion of the front end surface of the shaft attachment portion 30, that is, the annular portion outside the shaft 31 forms a receiving surface 30 a that receives the side surface of the winding core 17. The receiving surface 30 a receives and locks the winding core 17, thereby preventing the gas detection tape 16 from moving in the direction of the first storage space 24 </ b> A and preventing it from coming into contact with the partition plate 29. Note that the tip of the shaft 31 slightly protrudes rearward of the cassette body 21 from the unused detection paper storage unit 24.

  The second storage space 24B has a gas detection tape as shown in FIG. 3 in order to avoid contact with an O-ring 80 described later when the gas detection tape 16 is stored in the unused detection paper storage unit 24. It is formed sufficiently deeper than the width of 16. Therefore, when the gas detection tape 16 is stored in the second storage space 24 </ b> B, the gas detection tape 16 is positioned inside the opening of the unused detection paper storage unit 24. A slit-like opening 40 (FIGS. 1 and 2) for guiding the gas detection tape 16 to the detection paper passage 26 is formed in the inner peripheral wall 24b of the unused detection paper storage unit 24. The opening 40 is formed at a position shifted from the uppermost position of the inner peripheral wall 24 b by a required angle toward the center of the cassette body 21.

  The used detection paper storage unit 25 is formed of a circular recess having a depth substantially equal to the width of the gas detection tape 16, and is rotatable around the back wall 25a to wind up the used gas detection tape 16. A winding shaft 36 (rotating member) is provided. The winding shaft 36 is fastened to the start end of the gas detection tape 16 that is fed from the unused detection paper storage unit 24 and guided to the used detection paper storage unit 25 through the detection paper passage 26. The front end portion of the take-up shaft 36 protrudes rearward from the cassette body 21, and an engagement recess 37 that engages with an output shaft 57 of a drive motor 55 described later is formed on the front end surface. In addition, an opening 41 is formed in the inner peripheral wall 25b of the used detection paper storage unit 25 so that the end of the detection paper passage 26 communicates therewith. The opening 41 is formed at a position shifted from the uppermost position of the inner peripheral wall 25 toward the center of the cassette body 21 by a required angle.

The detection paper passage 26 has a groove-like horizontal passage portion 26a formed substantially horizontally at the upper back of the cassette body 21, and a lower portion connected to the upstream and downstream ends of the horizontal passage portion 26a. The tape introduction portion 26b and the tape discharge portion 26c are curved. The starting end of the tape introduction part 26 b communicates with the opening 40 of the unused detection paper storage part 24, and the end of the tape discharge part 26 c communicates with the opening 41 of the used detection paper storage part 25. The horizontal passage portion 26a includes a horizontal upstream passage portion 26a-1 and a downstream passage portion 26a-2. The downstream passage portion 26 a-2 of the horizontal passage portion 26 a is opened upward by an opening 42 provided on the upper surface S ₃ of the cassette body 21, thereby exposing the gas detection tape 16 to the outside of the cassette body 21. An exposed portion 43 is formed.

The exposed portion 43 has an appropriate length long in the longitudinal direction of the cassette body 21 and a width substantially equal to the width of the gas detection tape 16, and one side is open to the back surface S ₂ of the cassette body 21. Recess 32 is formed in the portion corresponding to the detected paper passage 26 in the back S ₂ of the cassette body 21, surrounding the periphery thereof.

The cover plate 22 is formed in a rectangular shape having the same size as the cassette main body 21 and is fixed to the back surface S ₂ of the cassette main body 21 by four set screws 23 screwed into the screw holes 27. a holding section 24 and the opening portion of the used detecting paper compartment 25, the open sides of the detection sheet passage 26, that is, the passage side which is open to the rear S ₂ of the cassette body 21, closes the recess 32 . The cover plate 22 is formed with bearing portions 50 and 51 for rotatably supporting the shaft 31 and the winding shaft 36, respectively. One bearing portion 50 is formed of a circular recess formed on the back surface of the cover plate 22 as shown in FIG. As shown in FIG. 1, the other bearing portion 51 is constituted by a through hole that penetrates the cover plate 22.

  The detection paper take-up means 13 includes a take-up shaft 36 and a drive motor 55 as means for driving the take-up shaft 36, and the gas detection tape 16 is intermittently driven by the drive motor 55 during tape take-up. It is configured to take up a certain length and wind up. The drive motor 55 is positioned on the surface of the cover plate 22 and fixed by a plurality of set screws 56, and is configured to be driven by a drive signal from the control unit of the measurement chamber. The front end of the output shaft 57 of the drive motor 55 is engaged with the engaging recess 37 of the winding shaft 36, thereby transmitting the rotation of the output shaft 57 to the winding shaft 36.

As the gas concentration measuring means 14 for measuring the ozone concentration, a reflectance measuring device 61 is used. The reflectance measuring device 61 is disposed in the cylindrical body 62, and is fixed to the upper surface S ₃ of the cassette body 21 by two set screws 60 so as to be positioned above the exposed portion 43. It comprises a sensor 63 and a signal processing circuit. The cylinder 62 is formed in a rectangular cylinder that opens up and down. As the sensor 63, for example, a light emitting diode 63a and a photodiode 63b having a wavelength of 610 nm are used. When the light emitted from the light emitting diode 63a hits the surface of the gas detection paper 11 exposed to the exposed portion 43 and is reflected, the light is received by the photodiode 63b, converted into an electrical signal, and then the reflection intensity is numerically converted by A / D conversion. It becomes. Since this numerical value corresponds to the color, the ozone concentration can be obtained.

  1, 2, 5 </ b> A, and 5 </ b> B, a detection paper feed amount detection unit 70 that detects the feed amount of the gas detection tape 16 is disposed in the detection paper passage 26. The detection paper feed amount detection means 70 detects the rotation body 71 provided in the passage portion 26a-1 upstream of the exposure section 43 in the horizontal passage portion 26a of the detection paper passage 26, and the rotation of the rotation body 71. And a sensor 72 that performs the above operation. The rotating body 71 is configured to rotate due to friction with the gas detection tape 16 when the gas detection tape 16 travels, with the upper outer peripheral surface coming into contact with the lower surface of the gas detection tape 16.

  The sensor 72 includes a movable electrode 72a fixed to the outer peripheral edge of the rotating body 71 and a fixed electrode 72b fixed to the cassette body 21 and in sliding contact with the movable electrode 72a. The movable electrode 72a comes into contact with the fixed electrode 72b when the rotating body 71 rotates once, whereby the circuit of the detection paper feed amount detecting means 70 is closed and the rotation of the rotating body 71 is detected. The detection signal of the detection paper feed amount detection means 70 is sent to the control unit of the measurement room. The control unit controls the drive motor 55 based on this detection signal. Note that a plurality of movable electrodes 72a or fixed electrodes 72b may be used, and the rotation may be detected each time the rotating body 71 rotates by a fraction of the number of electrodes.

  The rotating body 71 seals the gap between the gas detection paper 11 and the upper wall surface by lightly pressing the gas detection tape 16 against the upper wall surface of the upstream passage portion 26a-1.

  In such an ozone gas concentration measuring device 10, it is particularly important to prevent the unused gas detection paper 11 before measurement stored in the cassette 12 from fading due to ozone gas or moisture. For this reason, the unused detection paper storage section 24 and the upstream passage portion 26a-1 from the exposure section 43 of the detection paper passage 26 are hermetically sealed. Hereinafter, the seal structure will be described. Note that discoloration due to oxygen and moisture is also prevented by the desiccant 28 and the oxygen scavenger 28 as described above.

The cover plate 22 is fixed to the rear surface S ₂ of the cassette body 21 through the O-ring 80 as a seal member. The O-ring 80 is mounted in an annular seal groove 81 formed over the entire circumference of the unused detection paper storage unit 24 on the back surface S ₂ of the cassette body 21, and the cover plate 22 is brought into close contact, thereby detecting unused detection. The periphery of the paper storage unit 24 is hermetically sealed to prevent outside air from entering the unused detection paper storage unit 24 through the gap between the cassette body 21 and the cover plate 22. The seal groove 81 is divided by the opening 40 of the unused detection paper storage unit 24, but the O-ring 80 is not divided.

  The upstream passage portion 26a-1 of the horizontal passage portion 26a is provided with a sealing means 85 that presses the gas detection tape 16 against the upper wall surface of the passage portion to seal the gap between the gas detection paper 11 and the upper wall surface. It is located upstream of the detection paper feed amount detection means 70.

  The sealing means 85 includes a vertically movable presser 85a disposed in a recess 86 provided on the lower side wall surface of the upstream passage portion 26a-1, and a spring, a sponge, and the like that urge the presser 85a upward. Thus, the gas detection tape 16 is lightly pressed against the upper wall surface of the upstream passage portion 26a-1 within a range that does not cause a heavy load on the gas detection tape 16.

  On the downstream passage portion 26a-2 of the horizontal passage portion 26a, a horizontal pedestal portion 90 that protrudes upward from the lower side wall surface of the passage portion and supports the gas detection tape 16 from below projects over the entire length of the passage portion. Has been. Thereby, the opening area of the rear side opening that opens to the exposed portion 43 of the upstream passage portion 26a-1 is narrowed, and intrusion of air and moisture from the exposed portion 43 into the upstream passage portion 26a-1 is as much as possible. I try to prevent it.

Further, the open side surface of the detection paper passage 26 that opens to the back surface S ₂ side of the cassette body 21 is sealed by a seal portion 96 provided between the joining surfaces of the cassette body 21 and the cover plate 22. The seal portion 96 includes a recessed portion 32 formed in a portion corresponding to the detection paper passage 26 on the back surface S ₂ of the cassette body 21, and a protruding portion 95 that protrudes from the back surface of the cover plate 22 and fits into the recessed portion 32. It consists of and. The surface of the protrusion 95 is covered with rubber or the like in order to close the gap with the recessed portion 32 as much as possible to improve the sealing performance. A protruding portion 95 a that is inserted into the exposed portion 43 of the cassette body 21 is integrally provided on the protruding portion 95. The protrusion 95a sets the width of the passage portion 26a-2 and the opening 42 to be substantially equal to the width of the gas detection paper 16, and forms a guide surface that guides one side edge of the gas detection tape 16. The movement of the detection tape 16 in the width direction is prevented. Further, a disc-shaped protrusion 97 that restricts the movement of the gas detection tape 16 in the width direction is provided on the back surface of the cover plate 22 by being inserted into the unused detection paper storage unit 24. .

Next, measurement of ozone gas by the ozone gas concentration measuring device 10 having the above structure will be described.
In the measurement, the control unit of the measurement chamber sends a drive signal to drive the drive motor 55 in a measurement environment where ozone gas is present in the air. When the drive motor 55 is driven by a drive signal from the control unit, the gas detection tape 16 is wound around the winding shaft 36 by a predetermined amount, and the unused portion of the gas detection paper 11 is positioned in the exposure unit 43. When the gas detection tape 16 travels, the detected paper feed amount detection means 70 detects this travel as the number of rotations of the rotating body 71 and sends a detection signal to the control unit. When the control unit detects that the rotating body 71 has rotated a predetermined number of rotations based on the detection signal from the detection paper feed amount detection means 70, the control unit turns off the drive motor 55 and stops the drive motor 55. As a result, the unused portion of the gas detection paper 11 that has not been exposed is exposed to the outside of the cassette 12 via the exposed portion 43 and the cylindrical body 62 and becomes a measurement portion, and measurement of ozone gas is started in this state.

  When measurement is started by the ozone concentration measuring device 10, the measurement portion 11a facing the exposure portion 43 of the gas detection paper 11 is gradually discolored (discolored) by being exposed to ozone gas contained in the air. The gas concentration detection means 14 detects the discoloration of the measurement part 11a as a change in reflectance by a sensor 63 (63a, 63b) of the reflectance measuring device 61 at regular intervals. That is, when the light emitted from the light emitting diode 63a hits the measurement portion 11a, the amount of light reflected changes depending on the degree of color change. Then, the reflected light reflected by the measurement portion 11a is received by the photodiode 63b. The photodiode 63b receives the reflected light reflected by the color changing portion and converts it into an electrical signal, and A / D converts it into a numerical value by a signal processing circuit. The ozone concentration is automatically measured by comparing the reflectance with reflectance data obtained by exposing a reference gas detection paper to ozone gas in advance.

  When measurement is to be continued after a certain period of time has elapsed, the drive motor 55 is driven by remote operation in the same manner as described above, and the gas detection tape 16 is wound around the take-up shaft 36 in the same manner as described above, and the gas detection paper. It is possible to continuously measure 11 unused portions that are not exposed in the exposed portion 43.

  As described above, the ozone concentration measuring device 10 according to the present invention accommodates the gas detection paper 11 wound in a roll shape in the cassette 12 which is hermetically sealed by various sealing means and a sealing structure. The gas detection paper 11 is not exposed to the atmosphere and is easy to store, does not need to be stored in an aluminum packaging bag, can withstand long-term storage, discoloration due to ozone gas, and measurement error due to moisture It is possible to prevent a decrease in sensitivity. Further, since the detection paper take-up means 13 for automatically winding the gas detection paper 11 is provided, it is possible to measure continuously, and it is easier to handle than the conventional ozone concentration measuring instrument 1 shown in FIG. It is.

  In particular, since the desiccant 28 and the oxygen scavenger are stored in the unused detection paper storage unit 24, the influence of air and moisture can be further prevented.

  Further, since the rotation of the rotating body 71 is detected by the detection paper feed amount detection means 70 and the switch of the drive motor 55 is controlled to be turned ON / OFF, the gas detection tape 16 wound around the winding shaft 36 is controlled. Even if the radius gradually increases, the unused gas detection paper 11 can always be sent out to the exposure unit 43 by a certain length. Therefore, it is not necessary to control the rotation speed of the drive motor by calculating so that the outer circumference of the tape has a constant linear velocity, and it can be manufactured at low cost. The sensor 72 of the detection paper feed amount detection means 70 is not limited to the contact type but may be a non-contact type that detects optically.

  Furthermore, after all the gas detection paper 11 has been used up, the cassette 12 can be reused any number of times because it can be removed from the cassette 12 and replaced with a new unused gas detection tape.

[Second Embodiment]
In FIG. 6, in this embodiment, a roller 88 also serving as a detection paper feed amount detection unit is provided in the cylindrical body 62 of the gas concentration measurement unit 14, and the gas detection tape 16 is pressed against the pedestal 90. is there. Since other structures are completely the same as those of the first embodiment described above, the same components and parts are denoted by the same reference numerals, and description thereof is omitted.

  In this embodiment, the detection paper feed amount detection means 70 may be incorporated into the cylindrical body 62. Therefore, the detection paper feed amount detection means 70 can be an external type, and wiring for the detection paper feed amount detection means 70 can be provided in the cassette body 21. There is no need to apply. For this reason, in this embodiment, the rotating body 71 in the upstream passage portion 26a-1 may be simply used as a seal member for pressing the gas detection tape 16 against the passage wall, or may be completely removed.

[Third embodiment]
7 and 8, an ozone concentration measuring device 10A according to the present embodiment is the measuring device according to claim 9. The ozone concentration measuring device 10 according to the first embodiment is connected to the detection paper passage 26. A pre-processing unit 100 that exposes the next measurement part 11b of the gas detection paper 11 to the outside in advance for a certain period of time in a passage part upstream of the exposure part 43 in the horizontal passage part 26a of A shutter 101 that selectively opens the processing unit 100 to the atmosphere is further provided. Note that the same components and parts as those shown in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The horizontal passage portion 26 a of the detection paper passage 26 includes an upstream passage portion 26 a-1, an intermediate passage portion 26 a-2 that forms the pretreatment unit 100, and a downstream passage portion 26 a-3 that forms the exposed portion 43. It is configured. Upstream passage portion 26a-1 is not open to the upper surface S ₃ of the cassette body 21, it detects paper feed amount detection means 70 and sealing means 85 is disposed.

The pre-processing unit 100 has an opening 100 a formed on the upper surface S ₃ of the cassette body 21, and the opening 100 a is normally closed by a shutter 101. The pretreatment unit 100 is substantially the same size as the exposure unit 43 and is partitioned from the exposure unit 43 by the partition wall 102 of the upper plate portion 21c. The gas detection tape 16 passes below the partition wall 102 and is conveyed to the exposure unit 43.

The shutter 101 is formed in an elongated plate shape are slidably disposed in the longitudinal direction on the upper surface S ₃ of the cassette body 21, normally closes the opening 100a of the pre-processing unit 100 airtight. On the upper surface of the front end portion of the shutter 101, a hooking portion 101a for hooking a fingernail is formed.

The reflectance measuring device 14 of the gas concentration measuring means 14 for measuring the ozone concentration is fixed to the upper surface S ₃ of the cassette body 21 and covers the exposed portion 43, the preprocessing portion 100 and the shutter 101, and the case 62 includes The sensor 63 is arranged and a signal processing circuit or the like. The case 62 is formed in an elongated rectangular tube that opens up and down, and the inside is partitioned into two front and rear chambers 65a and 65b by a partition plate 64. The front chamber 65a communicates with the pretreatment unit 100, and the rear The side chamber 65 b communicates with the exposed portion 43. The lower end of the partition plate 64 is in contact with the partition wall 102 of the cassette body 21. A pair of left and right guide portions 66 that guide the shutter 101 are integrally extended toward the front at the lower end of the front surface of the case 62.

  The shutter 101 is located in the chamber 65a on the front side of the case 62, and in a state where the opening 100a of the pretreatment unit 100 is closed, the front end projects to the front of the case 62 and is positioned between the guides 66, and the rear end. Is in contact with the partition plate 64.

  At the boundary between the intermediate passage portion 26 a-2 and the downstream passage portion 26 a-3 of the horizontal passage portion 26 a, a pressing means 104 that is located directly below the partition wall 102 and presses the gas detection tape 16 against the lower surface of the partition wall 102. It is arranged. The pressing means 104 includes a rotating body 105 and an elastic member such as a spring (not shown) that urges the rotating body 105 upward and presses the rotating body 105 against the lower surface of the gas detection tape 16. The gap with the gas detection tape 16 is sealed.

  The intermediate passage portion 26a-2 and the downstream passage portion 26a-3 are respectively provided with horizontal pedestals 90a and 90b that protrude upward from the lower wall surface of the passage portion. The upstream pedestal portion 90a narrows the downstream opening area of the upstream passage portion 26a-1, and prevents air and moisture from entering the upstream passage portion 26a-1 from the pretreatment unit 100 as much as possible. The downstream pedestal portion 90b narrows the upstream opening area of the intermediate passage portion 26a-2 and prevents air and moisture from entering the intermediate passage portion 26a-2 as much as possible. Further, the shutter 101 prevents intrusion of air and moisture from the preprocessing unit 100 to the intermediate passage portion 26a-2.

Further, a seal portion 96 is provided on the joint surface between the cassette body 21 and the cover plate 22. The seal portion 96 includes a recessed portion 32 formed in a portion corresponding to the detection paper passage 26 on the back surface S ₂ of the cassette body 21, and a protruding portion that protrudes from the back surface of the cover plate 22 and fits into the recessed portion 32. 95. The protruding portion 95 is covered with rubber or the like in order to close the gap with the recessed portion 32 and improve the sealing performance, and the protruding portions 95a and 95b that fit into the pretreatment portion 100 and the exposed portion 43 are integrated. Thus, the width of the pretreatment unit 100 and the exposure unit 43 is set to be approximately equal to the width of the gas detection tape 16, and a guide surface for guiding one side edge of the gas detection tape 16 is formed. Is prevented from moving in the width direction. Other structures are the same as those in the first embodiment.

  When measuring ozone gas with the ozone gas concentration measuring instrument 10A having the above-described structure, the drive motor 55 is driven by the drive signal from the controller to wind the gas detection tape 16 in a measurement environment where ozone gas exists in the atmosphere. A predetermined amount is wound around the shaft 36, and the unused measurement portion 11 a of the gas detection paper 11 is positioned in the exposure unit 43. When the measurement part 11a of the gas detection paper 11 is moved to the exposure unit 43, the next measurement part 11b moves to the preprocessing unit 100 and stands by. The preprocessing unit 100 is closed by the shutter 101.

  In measurement, when the gas detection tape 16 is driven by driving the drive motor 55 and the measurement portion 11a of the gas detection paper 11 is moved to the exposure unit 43 and stopped, measurement of ozone gas is started in this state.

  When measurement of ozone gas is started, the measurement portion 11a of the gas detection paper 11 facing the exposure unit 43 is gradually discolored (discolored) by being exposed to ozone gas contained in the atmosphere. The gas concentration detecting means 14 detects the discoloration of the gas detection paper 11 as a change in reflectance by the sensor 63 at regular intervals, and the reflectance is measured by exposing the reference gas detection paper to ozone gas in advance. By comparing, the ozone concentration is automatically measured.

  During the measurement of ozone gas by the measurement part 11a of the gas detection paper 11, the next measurement part 11b is in the pretreatment unit 100 and is adapted to the pretreatment, that is, the humidity of the measurement environment. The preprocessing of the next measurement portion 11b is performed by a predetermined time before the measurement by the measurement portion 11a is completed, for example, 30 minutes before the shutter 101 is manually opened by the operator or automatically using a motor. This is done by opening 100 for a certain time. The optimum pretreatment time is about 30 minutes, and if it is longer than this, it is not preferable because the ozone gas in the atmosphere changes color more than necessary. On the other hand, if it is too short, moisture in the atmosphere is not sufficiently sucked, and the reflectance does not match the moisture in the atmosphere, resulting in a measurement error. When the preprocessing is completed, the next measurement part 11b is kept in the preprocessing unit 100 until the shutter 101 is closed and the measurement by the measurement part 11a is completed.

  When the measurement by the measurement portion 11a is completed after a certain time has elapsed, the drive motor 55 is driven by remote control to wind the gas detection tape 16 around the take-up shaft 36, and the next measurement portion 11b of the gas detection paper 11 is moved. It moves to the exposure part 43 and it is set as a new measurement part. Here, the initial value of the reflectivity of the next measurement portion 11b that has been pre-processed is measured in advance, and during the measurement, the difference from the initial value of the reflectivity is obtained to obtain the amount exposed to ozone during the pre-process. Can be measured continuously so that there is no measurement error. On the other hand, when the measurement is not performed continuously, the measurement portion 11 a that has been measured is retained in the exposure unit 43 until the next measurement is started.

  If measurement is not performed continuously, the shutter 101 is kept closed during measurement by the measurement portion 11a, and the preprocessing of the next measurement portion 11b waiting in the preprocessing unit 100 is suspended. deep.

  As described above, the ozone concentration measuring instrument 10A according to the present embodiment is provided with the pretreatment unit 100 on the upstream side of the exposure unit 43, waits for the next measurement portion 11b of the gas detection paper 11, and then starts the measurement. By opening the shutter 101 and opening the pre-processing unit 100 to the atmosphere, the next measurement portion 11b is previously adapted to the humidity of the measurement environment for a certain period of time, so the next measurement portion 11b is moved to the exposure unit 43. The reflectance when the measurement is started can be set to a reflectance that matches the humidity of the outside air. Therefore, it is not necessary to provide a waiting time after the measurement by the measurement part 11a is completed, and continuous measurement by the next measurement part 11b can be performed. In addition, measurement error due to humidity is small, and measurement accuracy can be improved.

[Fourth embodiment]
9, in this embodiment, a rotary shutter 101A is arranged on the back side of the cassette 12 instead of the slide shutter 101 shown in FIG. The cover plate 22 has a communication hole 110 that communicates with the pretreatment unit 100. The shutter 101 </ b> A has a vent hole 112 that is formed in a disk shape and can communicate with the communication hole 110 of the cover plate 22, and is rotatably disposed on a rotary shaft 113 that projects from the surface of the cover plate 22. . The shutter 101 </ b> A normally closes the communication hole 110, and is configured to open the pretreatment unit 100 to the atmosphere by rotating by a certain angle and matching the air hole 112 with the communication hole 110. Therefore, the cassette body 21, only the exposed portions 43 on the upper surface S ₃ are opened, the pre-processing unit 100 has not been opened, also slidable shutter 101 shown in FIG. 7 is not provided. Other structures are the same as those in the third embodiment.

  Even in such a structure, if the shutter 101A is rotated to connect the vent hole 112 to the communication hole 110, the pretreatment unit 100 can be opened to the atmosphere. It is possible to pre-process the next measurement part 11b waiting in the pre-processing unit 100 of the detection paper 11 and adjust the humidity to the measurement environment. Note that the shutter 101A (same for the shutter 101) is not limited to a manually operated one, and may be operated by a motor drive.

[Fifth embodiment]
10 and 11, an ozone concentration measuring device 10B according to the present embodiment is the measuring device according to claim 14, and the ozone concentration measuring device 10 according to the first embodiment is connected to the detection paper passage 26. A preprocessing unit 100 that exposes the next measurement portion 11b of the gas detection paper 11 to the outside in advance for a certain period of time in a passage portion upstream of the exposure unit 43 in the horizontal passage portion 26a, and this preprocessing. It differs from the ozone concentration measuring instrument 10 in the first embodiment described above in that it further includes filters 120a and 120b that cover the openings 121a and 121b of the unit 100 to remove ozone gas and allow moisture to pass through. Moreover, it differs from the ozone concentration measuring instrument 10A shown in the fourth embodiment in that filters 120a to 120c are provided instead of the shutter 101 or 101A. Note that the same components and parts as those shown in FIGS. 1 to 5 and 7 to 9 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  The horizontal passage portion 26a of the detection paper passage 26 includes an upstream passage portion 26a-1, an intermediate passage portion 26a-2, and a downstream passage portion 26a-3. The upstream passage portion 26 a-1 and the intermediate passage portion 26 a-2 that forms the pretreatment unit 100 are not opened to the upper side of the cassette body 21, and only the downstream passage portion 26 a-3 that forms the exposed portion 43. Is open upward.

Preprocessing unit 100 has an opening 121a formed in the front S ₁ and rear S ₂ of the cassette body 21 for ventilation (The opening that opens to the rear opening side of the intermediate passage portion 26a-2 of the cover plate side And the opening 121b formed in the cover plate 22 is open to the front and rear surfaces of the cassette 12. Moreover, these openings 121a and 121b are covered with filters 120a and 120b, respectively, which have air permeability but remove ozone gas which is a measurement gas. For this reason, the preprocessing unit 100 is held in a state having the same humidity as the measurement environment.

  As the filters 120a and 120b, conventionally known ozone filters (JP-A-3-213145, JP-B-63-131258, JP-A-4-7038, etc.) or membrane filters (JP-A-2006-258533) are used. Is used. Here, an example is shown in which an ozone filter having a corrugated honeycomb structure made of a thin aluminum foil as a carrier and a metal (Mn) catalyst coated on the surface thereof is used.

  As the membrane filter, for example, a polyimide film “Upilex S” (trade name) manufactured by Ube Industries, Ltd. is used. Since ozone gas is easily absorbed on the surface of a substance, it is known that ozone gas is also absorbed at a certain rate by the membrane filter.

A seal portion 96 provided between the joining surface of the back surface S ₂ of the cassette body 21 and the cover plate 22 is formed with a recessed portion 32 formed in a portion corresponding to the detection paper passage 26 in the upper back surface of the cassette body 21. , And a protrusion 95 that protrudes from the back surface of the cover plate 22 and fits into the recess 32. The recessed portion 32 has a length such that the front end extends above the opening 40 of the unused detection paper storage unit 24 and the rear end extends above the opening 41 of the used detection paper storage unit 25. The middle part is partitioned by a vertical partition plate 124, and is constituted by two front and rear chambers 32a and 32b. The front chamber 32 a is located below the upstream passage portion 26 a-1, and the rear chamber 32 b is located below the pretreatment unit 100 and the exposure unit 43. In addition, a filter storage recess 125 for storing an additional ozone filter 120c is provided at the front end of the rear chamber 32b when the thickness (length) of the ozone filter 120a, 120b alone is insufficient. Yes. The filter for accommodating section 125 has an opening 121c which opens to the bottom surface S ₄ of the cassette body 21 by being extended downward, whereby the ozone filter 120c of the lower end (inlet for outside air intake) Is exposed to the outside of the cassette body 21.

  The protrusion 95 of the cover plate 22 includes a front convex portion 95A and a rear convex portion 95B that are divided into two front and rear portions so as to correspond to the front chamber 32a and the rear chamber 32b. Further, the front convex portion 95A and the rear convex portion 95B are covered with rubber or the like in order to close the gap between the front chamber 32a and the rear chamber 32b and improve the sealing performance. Furthermore, a protruding portion 95a that fits into the exposed portion 43 is provided integrally with the rear convex portion 95B.

  Also in the ozone concentration measuring instrument 10B having such a structure, the pretreatment unit 100 is opened to the outside by the openings 121a to 121c, and air permeability is secured by the ozone filters 120a to 120c. It can be kept at the same humidity as the measurement environment. For this reason, the next measurement part 11b of the gas detection paper 11 waiting in the pre-processing unit 100 can be adapted to the humidity of the measurement environment, and the reflectance can be set to reflect the humidity of the outside air. On the other hand, since the ozone filters 120a to 120c remove ozone gas in the atmosphere, the ozone gas does not enter the pretreatment unit 100 and expose the next measurement portion 11b. Therefore, after the measurement by the measurement part 11a of the gas detection paper 11 is completed, when the next measurement part 11b of the gas detection paper 11 waiting in the preprocessing unit 100 is moved to the exposure unit 43, the above-described third Like the embodiment, there is no need to provide a waiting time, and ozone gas can be measured continuously. Further, if the reflectance of the next measurement portion 11b becomes a reflectance that matches the humidity of the outside air by the pretreatment, the measurement error due to humidity does not occur even in the gas detection paper 11 having humidity dependency, and the measurement accuracy is improved. Can be improved.

  Further, there is no possibility that ozone gas enters the unused detection paper storage unit 24, the passage portion 26a-1, the tape introduction unit 26b, and the unused detection paper storage unit 24 on the upstream side of the preprocessing unit 100. It is possible to reliably prevent the unused portion of the paper 11 from being exposed to ozone gas.

[Sixth embodiment]
In FIG. 13, the ozone concentration measuring apparatus according to the present embodiment forms an opening 100 a of the pretreatment unit 100 on the upper surface S ₃ of the cassette body 21 instead of providing an opening on the front and rear surfaces of the cassette 12. 100 a is covered with an ozone filter 120. Since the other structure is substantially the same as that of the fifth embodiment, the same constituent members and portions are denoted by the same reference numerals and the description thereof is omitted.

  Even in such a structure, the ozone filter 120 ensures the air permeability of the pretreatment unit 100, so that the next measurement portion 11b of the gas detection paper 11 waiting in the pretreatment unit 100 is in the atmosphere. It can be adjusted to the humidity of the measurement environment without being exposed to ozone gas.

  The present invention is not limited to the above-described embodiments, and various modifications and changes can be made. For example, in the above-described embodiments, indigo carmine is used as a dye that reacts with ozone gas, but not limited thereto, a triphenylmethane dye, an azo dye, an anthraquin dye, or the like may be used.

  In the above-described embodiment, the gas detection tape 16 is wound up by the remote operation of the drive motor 55, and the discoloration of the gas detection paper 11 is measured by the reflectance measuring device 61. Is not specified at all, and can be used as a portable measuring instrument. In that case, a manually operated handle is attached to the tip of the take-up shaft 36 instead of the drive motor 55, and the color sample 5 shown in FIG. Compared with the color sample 5, the gas concentration may be measured. Further, in the case of a portable type, neither the gas concentration measuring means 14 nor the detection paper feed amount detecting means 70 is required, so that it can be further simplified.

The gas concentration measuring device according to the present invention is not limited to an ozone concentration measuring device that measures ozone, but can also be applied to a concentration measuring device for nitrogen dioxide gas. In that case, a gas detection element in which a porous body is impregnated with a mixture of a diazotization reagent that reacts with nitrogen dioxide gas (NO ₂ ) and a coupling reagent or the like may be used as a detection agent.

Claims (18)

A cassette having a cassette body and a cover plate covering a back surface of the cassette body;
A tape-like gas detection paper wound in a roll and stored in the cassette and discolored when reacting to a specific gas;
Detection paper winding means for winding the gas detection paper;
Comprising
The cassette is
An unused detection paper storage unit for storing the unused gas detection paper formed on the back surface of the cassette body;
A used detection paper storage section for storing the used gas detection paper;
A detection paper path connecting the unused detection paper storage unit and the used detection paper storage unit;
An exposed portion that is formed on the upper surface of the cassette body and a part of the passage for the detection paper is exposed to the outside of the cassette;
A seal member that is interposed between the joint surfaces of the cassette body and the cover plate and hermetically seals the periphery of the unused detection paper storage unit;
Sealing means provided in a passage portion upstream of the exposed portion of the detection paper passage and pressing the gas detection paper against a wall surface of the upstream passage portion;
A gas concentration measuring device characterized by comprising: The gas concentration measuring device according to claim 1,
The detection paper winding means includes:
A take-up rotating member rotatably disposed in the used detection paper storage unit;
A drive motor for rotating the winding rotating member when winding the gas detection paper;
A gas concentration measuring device comprising: The gas concentration measuring device according to claim 1,
A gas concentration measuring device further comprising a detection paper feed amount detecting means for detecting a feed amount of the gas detection paper. The gas concentration measuring device according to claim 3, wherein
The detection paper feed amount detection means includes
A rotating body rotated by the gas detection paper when the gas detection paper travels;
A sensor for detecting rotation of the rotating body;
A gas concentration measuring device characterized by comprising: The gas concentration measuring device according to claim 1,
The rotating body has a sealing function of sealing the detection paper path by pressing the gas detection paper against the wall surface of the detection paper path. The gas concentration measuring device according to claim 1,
A gas concentration measuring device further comprising at least one of a desiccant and an oxygen scavenger stored in the unused detection paper storage unit. The gas concentration measuring device according to claim 1,
A gas concentration measuring instrument further comprising a seal portion for sealing the open side surface of the detection paper passage on the joint surface between the cassette body and the cover plate. The gas concentration measuring device according to claim 1,
A gas concentration measuring device, wherein the specific gas detected by the gas detection paper is ozone gas. The gas concentration measuring device according to claim 1,
A pre-processing unit that preliminarily adjusts the next measurement portion of the gas detection paper to the humidity of the measurement environment, and a shutter that selectively opens the pre-processing unit to the atmosphere in the passage portion upstream of the exposure portion of the detection paper passage. A gas concentration measuring device further comprising: The gas concentration measuring device according to claim 9, wherein
The pretreatment unit has an opening that opens to the upper surface of the cassette body,
The gas concentration measuring device according to claim 1, wherein the shutter is slidably provided on the upper surface of the cassette body and opens and closes the opening. The gas concentration measuring device according to claim 9, wherein
The cover plate has a communication hole communicating with the pretreatment unit,
The gas concentration measuring instrument, wherein the shutter has a vent hole and is rotatably provided on the cover plate, and opens the pretreatment part to the atmosphere via the communication hole and the vent hole. The gas concentration measuring device according to claim 9, wherein
A gas concentration measuring instrument characterized in that a partition wall is provided between the exposed portion and the pretreatment portion, and further a pressing means for pressing the gas detection paper against the lower surface of the partition wall. The gas concentration measuring device according to claim 9, wherein
The shutter opens the pretreatment unit to the atmosphere by operating a predetermined time before the next measurement unit waiting in the pretreatment unit of the gas detection paper is sent to the exposure unit for measurement. Gas concentration measuring instrument. The gas concentration measuring device according to claim 1,
A pre-processing unit that preliminarily adjusts the next measurement portion of the gas detection paper to the measurement environment upstream of the exposed portion of the detection paper passage, covers the opening of the pre-processing unit, removes specific gas, and removes moisture. A gas concentration measuring device, further comprising a filter for passing therethrough. The gas concentration measuring device according to claim 14, wherein
The gas concentration measuring instrument according to claim 1, wherein the opening of the pretreatment section is open to the upper surface of the cassette body. The gas concentration measuring device according to claim 14, wherein
The gas concentration measuring instrument according to claim 1, wherein the pretreatment unit communicates with the outside through an opening that opens to a front surface and a back surface of the cassette body and an opening formed in the cover plate. The gas concentration measuring device according to claim 14, wherein
A gas concentration measuring instrument characterized in that a partition wall is provided between the exposed portion and the pretreatment portion, and further a pressing means for pressing the gas detection paper against the lower surface of the partition wall. The gas concentration measuring device according to claim 14, wherein
The specific gas detected by the gas detection paper is ozone gas,
The gas concentration measuring instrument, wherein the filter is one of an ozone filter for removing ozone gas and a membrane filter.

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