JPH07146285A - Gas detector - Google Patents

Abstract

PURPOSE:To provide a gas detector which can measure the concentration of a plurality of types of gas constituents at a time, facilitate and speed up measurement operation, and at the same time improve safety. CONSTITUTION:A gas detector I which sucks a sample gas into a detection pipe where a detection agent is filled and measures the concentration of a specific or a non-specific gas which is mixed into the sample gas from the color-development reaction of the detection agent is provided with a hollow detection pipe fitting member where a plurality of detection pipes 1 can be fitted and a suction means for sucking the sample gas into the detection pipe fitting member via the detection pipe 1. Also, the detection pipe fitting member can be constituted of a fitting unit 10a for fitting a plurality of detection pipes 1 and a fitting member body for enabling the fitting unit 10a to be attached and detached freely and further the suction means can be a vacuum pump 20 which is connected to the detection pipe fitting member via the suction pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas detector, and more particularly to a gas detector for measuring the concentration of a certain gas component contained in a sample gas by a color reaction of a direct reading gas detector tube.

[0002]

2. Description of the Related Art FIG. 4 shows a suction type gas sampler 40 which is a conventional gas detector tube device. The collector 40 is usually 100
The cylinder 41 has a volume of ml, and the detection tube 1 is mounted on the front surface, and a piston-shaped handle 42 slidably fitted in the cylinder 41 in an airtight manner. The detection tube 1 is selected to be filled with a detection agent corresponding to the gas component to be measured. A certain amount (100 ml) of the sample gas as the measurement sample is sucked into the cylinder 41 through the detection tube 1 by manually pulling the handle 42. At this time, when the detection agent comes into contact with the sample gas, a colored layer appears from the tip of the detection tube 1, and the length of this colored layer is compared with that of a known one to determine the concentration of the specified gas component. Quantify.

Further, when the measurement area filled with the sample gas is dangerous and the measurer cannot stay, the detector tube 1
An extension hose is provided between the cylinder 41 and the cylinder 41 to perform the above measurement.

[0004]

However, in the conventional suction type gas sampler, since only one gas detection tube can be mounted, it is premised that the gas component to be measured is specified, and the sample gas When the gas component contained in is unknown, it cannot be effectively dealt with, and when a plurality of types of gas components are to be detected, it is necessary to replace the detection tube many times. Therefore, the measurement work takes a lot of time and effort,
In particular, safety cannot be confirmed promptly such as grasping the existence of harmful or toxic gas components, and the measurement work is dangerous.

The present invention has been made in view of the above-mentioned deficiencies of the prior art, and an object thereof is to be able to measure the concentrations of a plurality of kinds of gas components at one time and to make the measurement work simple and quick. At the same time, it is to provide a gas detection device that also improves safety.

[0006]

Means for Solving the Problems The present invention achieves the above object, and the gist thereof is to suck a sample gas into a detection tube filled with a detection agent and to carry out the sample gas from the color reaction of the detection agent. A gas detection device for measuring the concentration of a specific or unspecified gas component mixed in, wherein a hollow detection pipe mounting member capable of mounting a plurality of the detection pipes, and the detection pipe. And a suction means for sucking the sample gas into the inside of the detection tube mounting member through the gas detector.

Further, the detection tube mounting member can be constituted by a mounting unit for mounting a plurality of the detection tubes, and a mounting member main body for detachably mounting the mounting unit, and the suction means. Can be a vacuum pump connected to the detection tube mounting member via a suction tube.

[0008]

In the gas detector of the present invention, a plurality of detection tubes are attached to the detection tube attachment member, and the inside of the detection tube attachment member is made negative pressure by the suction means, so that the external sample gas is removed from each detection tube. Are taken into the detector tube mounting member in substantially the same amount. If the detection tube mounting member is composed of the mounting unit and the mounting member main body, it is possible to selectively mount the mounting units having different numbers of detection tubes installed on the mounting member main body. Further, if the suction means is a vacuum pump, it is not necessary to perform the suction work manually.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing an example of a gas detection device of the present invention. The gas detection device I includes a detection tube holder 10 as a hollow detection tube mounting member for mounting a plurality of detection tubes 1 on the front surface, and a suction hose 21 from this rear surface substantially central portion to the holder 10. It is composed of a vacuum pump 20 as a suction means to be connected. The vacuum pump 20 is controlled by a controller (not shown).
The suction force and activation time can be controlled as desired. As shown in the perspective view of FIG. 2, the detection tube holder 10 is formed in a cylindrical shape, and has five mounting holes 11 into which the ends of the detection tube 1 are fitted, as an example.
0a, and a holder body 10b as a mounting member body to which the unit 10a is detachably screwed. The manner of engagement between the mounting unit 10a and the holder body 10b is not limited to screw engagement or press-fit engagement as long as it is easy to remove and airtight. Further, by mounting a rubber packing or the like in the mounting hole 11 of the mounting unit 10a, the detection tube 1 becomes airtight when mounted.

FIG. 3 is a front view showing another example of the mounting unit. The unit 10a 'has mounting holes 11 at nine positions. Although another example is not shown, a plurality of mounting units having different numbers of mounting holes 11 can be set, and the mounting units can be replaceably installed in the holder body 10b.

Next, the usage state of the gas detector I will be described in detail. First, the mounting unit 10a having the mounting holes 11 corresponding to the number of gas components to be detected is selected and mounted on the holder body 10b. Here, the unit 10a (see FIG. 2) having five mounting holes 11 will be described as an example. Then, the respective ends of the five detection tubes 1 provided with the detection agent corresponding to the target gas component are fitted into the mounting holes 11 of the unit 10a, and then the vacuum pump 20 is operated to operate the inside of the detection tube holder 10. By making the pressure negative, the external sample gas is sucked into the holder 10 through each of the detection tubes 1. At this time, it is necessary to make the amount of gas passing through each detector tube 1 the same, and if it becomes non-uniform, it is corrected by a known means.
For example, the detector tube 1 that has a substantially shortest distance from the connection portion 21 ′ of the suction hose 21 (see FIG. 1), that is, the mounting unit 1
If the amount of gas passing through the detector tube 1 attached to the attachment hole 11 ′ (see FIG. 2) located at the center of the 0a is larger than the amount of sample gas passing through the other four detector tubes 1, the attachment hole The diameter of 11 'is reduced by attaching a detachable rubber ring. After passing, for example, 100 ml of the sample gas through each detection tube 1, the operation of the vacuum pump 11 is stopped, and after a predetermined reaction time elapses, various gas components contained in the sample gas due to the color reaction of the detection agent. Measure the concentration.

Note that the suction hose 21 can be extended to perform measurement work remotely.

[0014]

As described above, in the gas detector of the present invention, a plurality of detector tubes are attached to the detector tube mounting member,
Multiple gas components can be measured with a single suction operation.
If various mounting units that can attach different numbers of detector tubes can be exchanged from the mounting member body, the number of detector tubes can be changed according to the number of specified gas components to be measured. Can be simplified and shortened.

Even when the gas component in the sample gas is not specified, the presence or absence of a high-risk gas component expected to be contained can be quickly grasped and measured by using a plurality of detector tubes. Risks associated with measurement work can be quickly avoided, and safety can be improved. Furthermore, if a vacuum pump is used as the suction means, the suction work can be saved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a gas detection device of the present invention.

FIG. 2 is a perspective view showing a detector tube holder.

FIG. 3 is a front view showing an example of a mounting unit.

FIG. 4 is a side view showing a conventional suction type gas sampler.

[Explanation of symbols]

 I Gas Detector 1 Gas Detector Tube 10 Detector Tube Holder 10a, 10a 'Mounting Unit 10b Holder Body 11 Mounting Hole 20 Vacuum Pump 5a, 5a "Upper Front Half 21 Suction Hose

Claims (3)

[Claims] 1. A gas detection device for sucking a sample gas into a detection tube filled with a detection agent, and measuring the concentration of a specific or unspecified gas component mixed in the sample gas from a color reaction of the detection agent. The gas detection device is provided with a hollow detection tube mounting member capable of mounting a plurality of the detection tubes, and a suction means for sucking the sample gas into the detection tube mounting member via the detection tube. A gas detection device characterized by being provided. 2. The gas detection device according to claim 1, wherein the detection tube mounting member includes a mounting unit for mounting a plurality of the detection tubes and a mounting member main body for detachably mounting the mounting unit. 3. The gas detection device according to claim 1, wherein the suction unit is a vacuum pump connected to the detection pipe mounting member via a suction pipe.