JP4594571B2 - Environmental condition measuring device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a measuring apparatus that detects environmental conditions such as fouling, gas leakage, and fire by measuring components specified from the atmosphere of a monitoring area.
[0002]
[Prior art]
Conventionally, for example, as disclosed in Japanese Patent Application Laid-Open No. 5-128382, one of environmental conditions is detected by sampling an atmosphere in a monitoring area and analyzing the air with a mass spectrometer to detect a specified substance. As shown about detecting fire.
[0003]
[Problems to be solved by the invention]
However, in the case of using the measuring apparatus as described above, since air is simply introduced, it may take time in terms of concentration until the substance specified by the measuring apparatus can be detected. And if it is going to measure a specific substance in the range of very low concentration like environmental pollution, an apparatus is needed for an apparatus, and it will become expensive and difficult to handle.
[0004]
Therefore, an object of this invention is to make it easy to perform the measurement by an environmental condition measuring apparatus without difficulty.
[0005]
[Means for Solving the Problems]
In the present invention , a solvent is sprayed on air sampled from a monitoring area, a specific substance contained in the air is dissolved in the solvent, collected by cooling, and the specific substance is detected and measured. A measuring apparatus, a sampling pipe for introducing the air into the measuring apparatus, a cooling section formed using a fixed cooling element in the sampling pipe, and a solvent spray section for spraying a solvent upstream of the cooling section And an introduction pipe for introducing the solvent cooled by the cooling section into the measuring device, and a hole for allowing the solvent to flow into the introduction pipe. the material was fixed by heating dissipate to and is characterized that you prevent clogging of the pores.
[0006]
Further, the solid cooling element can be heated in reverse, and may be one that sprays the solvent in front of the cooling part of the sampling tube.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram schematically showing the overall environment state measuring apparatus using the present invention, and FIG. 2 is a block diagram schematically showing the mass spectrometer of FIG.
[0009]
In FIG. 1, 1 is a sampling tube, 2 is a cooling unit, 3 is a mass spectrometer, 4 is a solvent spraying unit, and includes an injector 42 having a concentration controller 41 and a tube tip 43 for spraying a mixed solvent of methanol / water. It is comprised by. Reference numeral 44 denotes a hygrometer, which is used for adjustment of the concentration adjuster 41.
[0010]
In addition, although mass spectrometer 3 'is a case where the position of mass spectrometer 3 is changed as another embodiment, there is no problem in providing both according to the objective.
[0011]
The cooling unit 2 is configured using a Peltier element 21 as a solid cooling element, and is configured such that the cooled solvent is introduced from the hole 22 through the introduction tube 23 into the mass spectrometer 3. Here, the Peltier element 21 is formed by connecting two kinds of metals having different properties. When a current is passed through the Peltier element 21, a Peltier effect is generated in which heat is absorbed on one side and heat is generated on the other side. This Peltier element 21 is made of a compound such as bismuth, antimony, or tellurium as a metal material. These metal materials are usually fixed with a hard ceramic on the top and bottom, but recently, an easy-to-handle element that is fixed with a flexible material such as plastic is also used, and the name “Frister element” is also used.
[0012]
Since such a Peltier element 21 is substantially flat, it can be used in a space-saving manner without taking up space when it is provided in a pipeline.
[0013]
In addition, since such a Peltier element 21 also has a heat generating action as described above, even when a substance is fixed to the hole 22 for flowing the solvent to the introduction pipe 23, by periodically dissipating the heat, Clogging can be prevented.
[0014]
Although not shown in detail, the mass spectrometer 3 includes an ionization unit, a mass separation unit, and an ion detection unit. For measurement, the ionization unit is first ionized. As an ionization method, a so-called soft ionization method is used. When using an atmospheric pressure ionization method using β-rays from a radioactive metal, an electrospray method in which a high electric field is ejected, etc., even a high molecular weight substance can be detected with reduced fragmentation. Following such ionization, it is detected by a detector through a quadrupole mass separator. FIG. 2 schematically shows a configuration of the mass spectrometer 3 by the electrospray method, and the solvent guided from the introduction tube 23 of FIG. 1 is discharged from the narrow tube 31 to which a high voltage is applied, and drops. The molecules that have been ionized and passed through the slit 32 are separated according to the mass number when passing through the separation unit 33 and detected by the detector 34.
[0015]
When the atmosphere is introduced into the sampling tube 1 from one room of the apartment, so-called VOC (volatile organic substance) is a cause of problems such as sick house, and formaldehyde is released from the cylinder tip 43 (methanol / water). And is collected in the solvent trapped in the cooling unit 2. This solvent is introduced into the mass spectrometer 3 and VOC such as formaldehyde is detected by the above-described method. Here, as VOC, if it has generate | occur | produced from the building material in the room | chamber source from which sampling, such as benzene, toluene, xylene, will be detected. Thus, it is used as an environmental condition measuring device for measuring indoor VOC as a countermeasure against sick house.
[0016]
Further, when a burnt odor is present in the sampled atmosphere, riboglucosan and the like are collected in a solvent and measured by the mass spectrometer 3 as in the case of VOC. A fire alarm can be issued depending on the detected amount of riboglucosan. Similarly, when the mass spectrometer 3 detects ethane or propane, a gas leak alarm can be issued.
[0017]
As another embodiment, it is possible to introduce a directly sampled atmosphere into such a mass spectrometer 3 ′, in which case the atmosphere from the tip of the narrow tube 31 in the mass spectrometer 3 ′ Is ejected directly. When measuring relatively stable gas molecules that are not trapped by the cooling unit 2, for example, a substance having a low boiling point or a substance that is not soluble in the solvent, the atmosphere cooled by the cooling unit 2 is introduced into the mass spectrometer 3 ′. , Making measurement easier. At the same time, by cooling without solvent spraying, it becomes possible to separate water, and only gas molecules can be introduced into the mass spectrometer 3.
[0018]
As described above, according to the present invention , a solvent is sprayed on air sampled from a monitoring area, a specific substance contained in the air is dissolved in the solvent, cooled and collected, and the specific substance is collected. A measuring device for detecting and measuring, a sampling tube for introducing the air into the measuring device, a cooling part formed using a fixed cooling element in the sampling tube, and a solvent upstream of the cooling part. comprising a solvent spray part for spraying, the inlet pipe for introducing the solvent which has been cooled by the cooling unit to the measuring device, and a hole for flowing the solvent to the introduction pipe, the cooling unit, the heating by the action, the substance adhered by heat dissipated into the hole, Runode to prevent clogging of the pores, easily collecting the solvent and analyte, there is an effect that measurement is effectively performed.
[0019]
In addition, the solid cooling element can be heated in the reverse direction, and can prevent the clogging of the hole to the introduction pipe by heating and dissipating the deposits. It is possible to collect floating substances by spraying.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an embodiment of the present invention.
2 is a schematic configuration diagram showing the mass spectrometer of FIG. 1. FIG.
[Explanation of symbols]
2 Cooling unit 21 Peltier element 3, 3 'mass spectrometer

Claims (1)

It is a measuring device that sprays a solvent on air sampled from a monitoring area , dissolves a specific substance contained in the air, cools and collects it, and detects and measures the specific substance. And
A sampling tube for introducing the air into the measuring device;
A cooling section formed using a fixed cooling element in the sampling tube;
A solvent spraying section for spraying a solvent upstream of the cooling section;
An introduction pipe for introducing the solvent cooled by the cooling unit into the measuring device;
Holes for flowing the solvent into the inlet tube;
Equipped with a,
The cooling unit by its heating action, the substance fixed to the hole by heat dissipated, the environment measuring apparatus characterized that you prevent clogging of the pores.

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