JPH05142178A - Detector - Google Patents

Abstract

PURPOSE:To enable detection of a component even in a low concentration sample without heightening the sensitivity of a sensor by arranging a film to permeate desired components within a housing selectively so that the film is opened outside the housing on the primary side and a detector for the desired components within the housing on the secondary side of the film. CONSTITUTION:A separation film 2 is provided to separate desired components from a sample within a housing 1. Outside the housing 1, an inlet pipeline 3 is provided on the primary side of the film 2 to introduce the desired components and an outlet pipeline 4 to discharge the components other than the desired components separated with the film 2. A detector 6 is provided in a path toward an outlet 5 within the housing 1 on the secondary side of the film 2. A sample of a gas, liquid or the like is introduced into the film 2 from the pipeline 3. The desired components which permeates the film 2 in the housing 1 is introduced into the detector 6 and after the detection thereof, the components are discharged outside at the outlet 5 of the housing 1. Thus, the desired components are separated mainly thereby enabling detection even when the concentration of the desired components of the sample is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detector for detecting a chemical component of a target component such as a gas sensor, an ion sensor, a biosensor and the like.

[0002]

2. Description of the Related Art As a gas sensor which is one of detection devices for detecting chemical components, an electrode is connected to a metal oxide semiconductor (SnO ₂ ) whose resistance value changes due to adsorption and desorption of gas, and the resistance value is measured. Therefore, a semiconductor gas sensor that detects the presence or absence of gas is used as a gas leak alarm or the like.

As such a chemical detection device, it is desired to detect only the target component with high sensitivity, and for this purpose, various catalyst additions have been tried in the past.

[0004]

However, as described above, in order to enhance the sensitivity of the detection device or to enhance the selectivity for a specific component, the sensitivity or selectivity of the sensing element itself is added by adding a catalyst or the like. There is a limit to the increase, and it is difficult to maintain long-term stability. In addition, even if the sensitivity of the detection element itself is increased, the measured value cannot be relied on when an interfering substance is present.

[0005]

In order to solve the above-mentioned problems, in the detection device according to the first invention of the present application, a membrane that selectively permeates a target component is arranged in the housing, and the primary side of this membrane is arranged. Was opened to the outside of the housing, and a detector for the target component was provided in the housing which is the secondary side of the membrane. Further, in the detection device according to the second aspect of the present invention, a detection box containing a detector for the target component was connected to the primary side outlet of the membrane that selectively permeates components other than the target component.

[0006]

[Function] Since the target component is separated from the sample by the separation membrane or the interfering component is removed and introduced into the sensor, it is possible to detect the target component in a state where the concentration of the target component is increased. Can be measured.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a configuration diagram of a detection device according to the first invention of the present invention, and FIG. 2 is a configuration diagram of a detection device according to the second invention.

In the detection device of FIG. 1, a separation membrane 2 for separating a target component from a sample is arranged in a housing 1, and the target component is provided outside the housing 1 on the primary side (supply side) of the separation membrane 2. An inlet pipe line 3 for introduction and an outlet pipe line 4 for discharging components other than the target component separated by the separation membrane 2 are provided. Separation membrane 2
As, an inorganic film and an organic film can be used, and as the inorganic film, a porous ceramic film, a porous glass film, or the like,
As the organic film, cellulose acetate, polyimide, polysulfone or the like can be used. And the separation membrane 2
In the housing 1 which is the secondary side (transmission side) of the detector 1, the detector 6 is exposed in the passage toward the outlet 5 of the housing 1.

Here, for example, gas can be separated by using a porous material as the separation membrane 2. That is, the permeation flow rate of the membrane is generally represented by the following (Equation 1). Therefore, the gas can be separated by the difference in the molecular weight.

[0010]

[Equation 1]

In the detection device thus constructed,
By introducing target components such as gas and liquid into the separation membrane 2 from the inlet pipe line 3, the target components of the sample are selectively separated by the separation membrane 2 to be permeated into the housing 1, and the components other than the target components are separated. Is discharged to the outside via the outlet pipe line 4.

After the target component having permeated the separation membrane 2 into the housing 1 is introduced into the detector 6 and detected,
It is discharged from the outlet 5 of the housing 1 to the outside. At this time, since the target component is mainly separated and extracted in the sample introduced into the detector 6, it is possible to detect even if the concentration of the target component in the sample introduced into the inlet pipe line 3 is low.

Next, the detection apparatus shown in FIG. 2 has a separation membrane 1 which allows components other than the target component to permeate from the sample into the housing 1.
2 is provided, and a detection box 7 connected to an inlet pipe 3 for introducing a target component into the separation membrane 12 and an outlet pipe 4 on the primary side of the separation membrane 12 is provided outside the housing 1. The detector 6 is housed in the housing 7, and the housing 1 is provided with an outlet 5 for discharging components other than the target component to the outside.

In the detection device thus constructed,
By introducing a sample such as gas or liquid from the inlet pipe line 3 to the primary side of the separation membrane 12, the separation membrane 12 selectively separates components (interfering components) other than the target component in the sample, and the inside of the housing 1 is separated. Then, the sample from which the excess component has been removed is introduced into the outlet conduit 4 and the target component can be detected by the detector 6.

[0015]

As described above, according to the present invention,
Since it was introduced into the detector through a separation membrane that separates the target component from the sample, it is possible to measure to low concentrations without increasing the sensitivity of the sensor element itself, and it is possible to remove the influence of interfering components. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a detection device according to a first invention.

FIG. 2 is a configuration diagram of a detection device according to a second invention.

[Explanation of symbols]

1 ... Housing, 2, 12 ... Separation membrane, 3 ... Inlet line, 4
... outlet line, 5 ... outlet, 6 ... detector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Suzuki 2-1, 1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Kikai Co., Ltd. 1st-1st Totoki Equipment Co., Ltd.

Claims (2)

[Claims] 1. A detection device for chemically detecting a target component, wherein the detection device has a membrane inside the housing, which selectively permeates the target component, and the primary side of the membrane is opened outside the housing. A detection device characterized in that a detector for a target component is provided in a housing on the secondary side of the membrane. 2. A detection device for chemically detecting a target component, wherein the detection device is connected to a detection box containing a detector for the target component at a primary outlet of a membrane that selectively permeates other than the target component. A detection device characterized by the above.