JPH0732560U - Dissolved ozone concentration measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] A simple structure is dissolved by adopting a thin film separation method using a microporous polymer film and measuring ozone transferred to the gas phase with a gas sensor such as a semiconductor device structure. Provides ozone concentration. According to a first aspect of the present invention, a closed container having a sample water inlet and a sample water outlet is formed, and a wall of a microporous polymer film is formed on the sealed container and the outside of the polymer film is formed. A measurement tube is formed in the measurement chamber, a gas sensor is arranged in the measurement chamber, and a contact tube for discharging the sample water toward the wall surface of the polymer film is provided to the sample water introduction port. In the apparatus for measuring dissolved ozone concentration, the cylindrical joint in which the measurement chamber is arranged in a penetrating state from the outside to the inside of the sealed container, and the tubular joint is detachably fixed to the inner end of the sealed container. It is formed with a cap body having a wall surface of a microporous polymer film on the tip surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention moves dissolved ozone in sample water collected from tap water, industrial water, etc. into a gas phase through a microporous polymer membrane, and measures it with a gas sensor such as a semiconductor device structure. The present invention relates to a dissolved ozone concentration measuring device for measuring the dissolved ozone concentration in sample water based on the above.

[0002]

[Prior art and its problems]

 In general, in the field of using ozone such as tap water and industrial water, the solubility of ozone in water greatly changes depending on the water temperature and the ozone concentration in the gas phase, and ozone itself decomposes at the same time as it is generated. Due to its unstable nature, it requires continuous measurements of ozone concentration.

The concentration measuring apparatus for dissolved ozone, which has been mainly used conventionally, has an extremely high accuracy compared with, for example, the concentration measurement using a reagent, and it is also excellent in automation. An absorption type concentration measuring device is known. This ultraviolet absorption method utilizes the fact that ozone has an absorption spectrum (Hartley band) with a peak at around 254 nm in the ultraviolet region, so that the sample water in the ultraviolet-transparent flow cell has a wavelength of 253.7 nm. By directly irradiating ultraviolet rays with a low-pressure mercury lamp having a strong emission line spectrum and measuring the amount of transmission, the Lambert. The concentration is measured based on Beer's law.

[0004]

[Problems to be solved by the device]

 However, conventional concentration-measuring devices using absorptiometry have many advantages, such as the ability to selectively measure the components contained in sample water by the difference in wavelength, but coexisting substances other than ozone do not exist. Certain inorganic ions, amino acids, proteins, ammonia, amine chloride, microluacean, etc. adversely affect the measured values, so special equipment must be provided to remove these coexisting substances other than ozone.

On the other hand, as with the concentration measuring apparatus using the ultraviolet absorption method, a measuring apparatus that measures liquid-phase ozone using a membrane separation method has been proposed as a method that does not use a reagent. An apparatus that employs this type of membrane separation method is, for example, a double tube in which an outer tube such as glass is placed on the outer circumference of a small-diameter inner tube made of a microporous polymer membrane such as PTFE, etc. It was used as a separator and a flow cell for transferring dissolved ozone.

In the apparatus having the above-mentioned configuration, ozone in the sample water flowing into the inner tube passes through the inner tube of the microporous polymer film, and enters the space provided between the inner tube and the outer tube. Since it moves, ozone-containing gas can be guided to an appropriate measurement means such as chemiluminescence by injecting clean air into the space. The effect of can be avoided.

However, none of these concentration measuring devices are suitable for measuring the concentration of low-concentration ozone, and it requires time and effort for maintenance, and the device configuration is complicated, resulting in large size and high cost. There were problems such as inevitability.

[0008]

[Means for solving the problem]

 In view of the above-mentioned reasons, the present invention has tried to provide a concentration measuring device having a simple structure by adopting a thin film separation method using a microporous polymer film and further devising the device configuration. That is, the dissolved ozone in the sample water is moved into the gas phase through the microporous polymer film provided in the sealed container, and the ozone is measured by the gas sensor of the semiconductor device structure or the like. In addition to simplification and cost reduction, the dissolved ozone concentration measuring apparatus disclosed in claim 1 is provided with a contact pipe at the inlet of the sample water so that ozone can be smoothly transferred to the gas phase. In the dissolved ozone concentration measuring device disclosed in claim 2 which is further improved in functionality and reliability, as a concrete structure, the measuring chamber in which the gas sensor is arranged is formed by a cylindrical joint, while the tip end surface is formed. A cap body with a wall of a microporous polymer membrane is formed on the inside, and the cap body is detachably attached to the tubular joint to improve the maintainability.

[0009]

[The purpose of the device]

 As described above, the main purpose of the present invention is to adopt a thin-film separation method using a microporous polymer film as a concentration measuring device of this kind, and further, to move ozone that has been transferred to the gas phase to a semiconductor device structure or the like. The purpose is to provide a dissolved ozone concentration with a simple structure by measuring with a gas sensor.

[0010]

[Constitution of device]

 The constitution of claim 1 of the utility model registration claim of the present invention forms a closed container provided with a sample water inlet and a sample water outlet, and a wall of a microporous polymer membrane is formed on the sealed container. A measurement chamber was formed on the outside of the polymer film while forming, a gas sensor was installed in the measurement chamber, and a contact tube for discharging the sample water toward the wall surface of the polymer film was provided to the sample water inlet. In the dissolved ozone concentration measuring apparatus according to claim 1 within the scope of the utility model registration request, the measurement chamber is arranged from the outside to the inside of the sealed container. A cap body that is detachably fixed to the inner end of the cylindrical joint of the tubular joint that is disposed in a penetrating state and that has a wall surface of a microporous polymer film on the front end surface. It is a structure formed by and.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings of the embodiments. FIG. 1 is a schematic view of the dissolved ozone concentration measuring apparatus according to claim 1 of the present invention, and FIG. 2 is the first of claim 2 of the present invention. FIG. 3 is a schematic cross-sectional view showing a dissolved ozone concentration measuring apparatus according to an embodiment, and FIG. 3 is a schematic cross-sectional view showing a dissolved ozone concentration measuring apparatus according to a second embodiment of claim 2 of the utility model registration claim of the present invention. is there.

As shown in FIGS. 1 and 2, the apparatus for measuring dissolved ozone concentration of the present invention has a microporous structure in which the dissolved ozone in the sample water A collected from tap water, industrial water, etc. is provided in the sealed container 1. It is moved into the gas phase of the measurement chamber 3 through the high molecular weight film 2 and the ozone in the gas phase is measured by the gas sensor 4 such as a semiconductor device structure arranged in the measurement chamber 3, and based on the measured value. It is a dissolved ozone concentration measuring device having a simple structure for measuring the concentration of dissolved ozone in sample water A.

The dissolved ozone concentration measuring device according to claim 1 of the utility model registration claim is a closed container provided with a sample water inlet 1a and a sample water outlet 1b as shown in the schematic view of FIG. A body 1 is formed, a wall surface of a microporous polymer film 2 is formed on the closed container 1, a measurement chamber 3 is formed outside the polymer film 2, and a gas sensor 4 is arranged in the measurement chamber 3. The main point is that the sample water inlet 1a is provided with a contact tube 5 for discharging the sample water A toward the wall surface of the polymer film 2.

That is, the dissolved ozone concentration measuring apparatus 1 according to claim 1 plays a role of a flow cell for measurement, and the sample water inlet 1a is provided on the lower side such as the bottom surface and the upper side such as the side surface. The sealed container 1 having an appropriate shape having the sample water discharge port 1b formed therein is formed.

The sample water inlet 1a of the sealed container 1 is connected to a sample water A inlet side pipe line (not shown) in which a pump device or the like is arranged, and the sample water outlet 1b is connected to the sample water A. Is connected to a discharge side pipe line (not shown), and the concentration of dissolved ozone in the sample water A is measured continuously from the sample water inlet 1a toward the sample water outlet 1b. The gas is introduced into the measuring chamber 3 by a gas sensor 4 which will be described later.

The measurement chamber 3 is formed, for example, by forming an upper surface of the sealed container 1 as an airtight space that bulges inward, and a liquid such as water does not pass through the bottom surface of the measurement chamber 3. Although a wall of a polymer film 2 made of a microporous thin film such as PTFE that allows gas such as ozone to pass through is formed, a semiconductor device connected to the display device 6 and the like in the space of the measurement chamber 3 is formed. A gas sensor 4 having a structure or the like is arranged.

The gas sensor 4 is made of, for example, a metal oxide semiconductor such as SnO ₂ , ZnO, Fe ₂ O ₂ electrically connected to an analysis circuit using a resistor or the like, a control circuit, or the like. When ozone comes into contact with the surface of No. 4, the electric resistance value (electrical conductivity) changes.

The dissolved ozone concentration measuring apparatus of the present invention is designed to measure ozone dissolved in the sample water A inside the sealed container 1 into the gas phase in the measuring chamber 3 through the microporous polymer film 2. Then, the dissolved ozone concentration is measured based on the electric resistance value of the gas sensor 4 changed by the contact with the ozone gas while being moved. However, when bubbles accumulate on the surface of the polymer film 2, Dissolved ozone does not move smoothly into the gas phase in the measurement chamber 3, resulting in a decrease in accuracy such as variations in measured values.

Therefore, in the dissolved ozone concentration measuring apparatus of the present invention, the sample water inlet 1a is provided with the contact tube 5 having the outlet in the vicinity of the polymer membrane 2, and the sample water A is hermetically sealed. At the time of introduction into the inside of the polymer film 1, the sample water A is discharged toward the wall surface of the polymer film 2 to prevent generation of bubbles on the polymer film 2.

Next, the dissolved ozone concentration measuring apparatus according to claim 2 of the scope of utility model registration claims has a sample water inlet 1a and a sample water outlet as shown in the schematic sectional views of FIGS. 1b is formed to form a closed container 1, a wall of a microporous polymer film 2 is formed on the closed container 1, and a measurement chamber 3 is formed outside the polymer film 2 to perform the measurement. The dissolved ozone concentration according to claim 1, wherein a gas sensor 4 is arranged in the chamber 3, and a contact tube 5 for discharging the sample water A toward the wall surface of the polymer film 2 is provided to the sample water inlet 1a. In the measuring device, the measuring chamber 3 is arranged in a penetrating state from the outside to the inside of the sealed container 1, and the tubular joint 3a can be freely attached to and detached from the pipe end of the cylindrical joint 3a inside the sealed container 1. And the cap body 3b having the wall surface of the microporous polymer membrane 2 provided on the front end surface. The point is that they are formed.

That is, the dissolved ozone concentration measuring apparatus according to claim 2 of the scope of utility model registration is the dissolved ozone concentration measuring apparatus disclosed in claim 1, which further discloses a specific device structure. It is mainly composed of a closed container 1, a wall surface of the polymer membrane 2 and a general-purpose cylindrical joint 3a for forming the measurement chamber 3 and a cap body 3b.

The hermetically sealed container 1 is composed of, for example, a cylindrical container main body and a lid or the like fitted to the top opening and bottom opening of the container main body through an appropriate sealing means such as an annular ring. A substantially circular through hole is formed in a part of the lid on the upper surface, and the tubular joint 3a is inserted and fixed in the through hole through an appropriate sealing means. In the embodiment, the threaded portion is formed in the through hole, and the threaded portion of the tubular joint 3a is screwed into and fixed to the threaded portion.

The tubular joint 3a is formed of a general-purpose synthetic resin pipe joint or the like having a screw portion on the outer peripheral surface of one pipe end portion which is the inner side of the sealed container 1, and A cap body 3b that can be screwed into the threaded portion of the joint 3a is formed, and the tubular joint 3a and the cap body 3b are detachably fixed.

A gas sensor 4 having a semiconductor element structure connected to a display means 6 disposed outside is provided from the other end of the tube, which is the outer side of the sealed container 1, to the space inside the body. The other end of the tube is sealed by an appropriate means, and the space surrounded by the body of the cap body 3b and the tubular joint 3a is used as the measurement chamber 3.

An opening is formed in the tip end surface of the cap body 3b, and when the cap body 3b is screwed into the tubular joint 3a, the sheet-shaped microporous polymer film 2 is capped. The wall of the polymer film 2 is formed in the measurement chamber 3 by inserting the cap 3b between the cap body 3b and the tubular joint 3a and closing the opening of the cap body 3b with the polymer film 2. .

In the dissolved ozone concentration measuring apparatus according to claim 2 of the present invention, since the cap body 3b having the polymer film 2 can be attached to and detached from the tubular joint 3a, the polymer film can be used over time. When 2 deteriorates, all that is necessary is to remove the cap body 3b and replace the polymer film 2, and maintenance is extremely easy.

In the illustrated dissolved ozone concentration measuring apparatus, the sample water inlet 1 a is provided on the bottom wall of the closed container 1 having a cylindrical shape with a bottom, and the sample water outlet 1 b is formed on the side wall of the sealed container 1. However, various designs such as providing the sample water inlet 1a in the lid fitted in the bottom opening and providing the sample water outlet 1b in the lid fitted in the upper opening, etc. Changeable.

[0029]

[Effect of device]

 In the present invention, the dissolved ozone in the sample water was moved into the gas phase through the microporous polymer film provided in the sealed container, and the ozone was measured by the gas sensor of the semiconductor device structure, etc. Not only is it possible to provide a low-cost device by simplifying the device configuration without the interference of coexisting substances in the sample water as in the case of the concentration measuring device of the method, especially when using a gas sensor with a semiconductor element structure. In addition, it is possible to provide a measuring device that can measure low concentration of dissolved ozone with high sensitivity and that is suitable for leak control of residual ozone concentration. Further, in the dissolved ozone concentration measuring apparatus disclosed in claim 1 of the present invention, since the contact tube is provided at the inlet of the sample water, bubbles are not accumulated on the polymer membrane, and the ozone in the gas phase is not accumulated. Since it moves smoothly, it is excellent in functionality and reliability. In the dissolved ozone concentration measuring apparatus disclosed in claim 2, the measuring chamber in which the gas sensor is arranged is further formed by a cylindrical joint, and the tip surface is In addition to the above effects, the epoch-making is excellent in maintenance such as simplification of membrane exchange because the cap body with the wall surface of the microporous polymer membrane is attached detachably. It is a very meaningful idea.

[0029]

[Brief description of drawings]

FIG. 1 is a schematic view of a dissolved ozone concentration measuring apparatus according to claim 1 of the present invention, which is a utility model registration claim.

FIG. 2 is a schematic cross-sectional view showing a dissolved ozone concentration measuring apparatus of a first embodiment of claim 2 within the scope of utility model registration claims of the present invention.

FIG. 3 is a schematic sectional view showing a dissolved ozone concentration measuring apparatus according to a second embodiment of claim 2 of the utility model registration claim of the present invention.

[0030]

[Explanation of symbols]

 A Sample water 1 Sealed container 1a Sample water inlet 1b Sample water outlet 2 Polymer membrane 3 Measuring chamber 3a Cylindrical joint 3b Cap body 4 Gas sensor 5 Contact tube 6 Display device

Claims (2)

[Scope of utility model registration request] 1. A closed container provided with a sample water inlet and a sample water outlet is formed, and a wall surface of a microporous polymer film is formed on the sealed container and is measured outside the polymer film. Dissolved ozone concentration measuring apparatus characterized in that a chamber is formed, a gas sensor is arranged in the measurement chamber, and a contact tube for discharging sample water toward the wall surface of the polymer film is provided to the sample water inlet port. . 2. The dissolved ozone concentration measuring device according to claim 1, which is a claim for utility model registration, and a cylindrical joint in which the measuring chamber is arranged in a penetrating state from the outside to the inside of the sealed container, and the cylinder. Dissolved ozone concentration characterized by being detachably fixed to the pipe end inside the sealed container of the tubular joint and formed with a cap body provided with a wall of a microporous polymer membrane on the tip surface apparatus.