JPS642889B2 - - Google Patents
Info
- Publication number
- JPS642889B2 JPS642889B2 JP4420182A JP4420182A JPS642889B2 JP S642889 B2 JPS642889 B2 JP S642889B2 JP 4420182 A JP4420182 A JP 4420182A JP 4420182 A JP4420182 A JP 4420182A JP S642889 B2 JPS642889 B2 JP S642889B2
- Authority
- JP
- Japan
- Prior art keywords
- sample gas
- port
- side port
- switching valve
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007789 gas Substances 0.000 claims description 121
- 238000005259 measurement Methods 0.000 claims description 43
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 46
- 229910002092 carbon dioxide Inorganic materials 0.000 description 23
- 239000001569 carbon dioxide Substances 0.000 description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 241000699666 Mus <mouse, genus> Species 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 241000699670 Mus sp. Species 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/37—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】
この発明はガス濃度測定装置に関し、特に１台
の非分散形赤外線ガス分析計で２つの試料ガス中
の特定成分絶対濃度と濃度差とを簡単な切換操作
によつて測定できるようにしたガス濃度測定装置
を提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas concentration measuring device, and particularly to a gas concentration measuring device that can measure the absolute concentration of a specific component in two sample gases and the concentration difference by a simple switching operation using a single non-dispersive infrared gas analyzer. The present invention provides a gas concentration measuring device capable of measuring gas concentration.
例えば植物の炭酸同化作用や生物の呼吸作用等
の研究においては、それらに供給される試料ガス
と供給後排出される試料ガスにおけるそれぞれの
中の炭酸ガス絶対濃度及びそれらの濃度差の両測
定が重要である。 For example, in research on carbon dioxide assimilation in plants and respiration in living organisms, it is necessary to measure both the absolute concentration of carbon dioxide in the sample gas supplied to them and the sample gas discharged after supply, as well as the difference in concentration between them. is important.
従来は絶対濃度測定の場合、比較セルに窒素ガ
スを導入し試料セルにそれぞれの試料ガスを導入
して行ない、濃度差測定の場合、両セルにそれぞ
れの試料ガスを導入して行なつていた。 Conventionally, for absolute concentration measurements, nitrogen gas was introduced into the comparison cell and each sample gas was introduced into the sample cell, and for concentration difference measurements, each sample gas was introduced into both cells. .
前者の測定には窒素ガスが必要であり、窒素ガ
スを使用すると水分干渉の影響がある赤外分析計
で比較セルにだけ水分を含まない窒素ガスが導入
されることになり正確な測定ができなかつた。ま
た両者の測定の選択を簡単な操作で行なうことが
できなかつた。 The former measurement requires nitrogen gas, and if nitrogen gas is used, the infrared analyzer is affected by moisture interference, and nitrogen gas that does not contain moisture is introduced only into the comparison cell, making accurate measurements impossible. Nakatsuta. Furthermore, it was not possible to select between the two measurements with a simple operation.
更に上記のごとき従来の装置では、空気中の炭
酸ガス濃度測定時において、分析計内の光源、測
定セル及び比較セル、検出器等の光学系の隙間が
空気で占められ、従つて空気中の炭酸ガス濃度が
大きく変化した場合、その影響を受けて測定値に
誤差が生じるという問題があつた。 Furthermore, in conventional devices such as those described above, when measuring the carbon dioxide concentration in the air, air occupies the gaps between the light source, the measurement cell, the comparison cell, the detector, etc. in the optical system in the analyzer. There was a problem in that when the carbon dioxide concentration changed significantly, errors occurred in the measured values due to the influence.
この発明はこれらの事情に鑑みなされたもので
あり、その具体的構成は光源、対向する測定セル
及び比較セル、検出器等を備えた非分散形赤外線
ガス分析計と、測定セルに試料ガスを導入できる
第１試料ガス導入路と、比較セルに他の試料ガス
を導入できる第２試料ガス導入路と、これらの試
料ガス導入路にそれぞれ介接された第１・第２切
換弁とを備え、
第１切換弁が測定セル側ポートを試料ガス入口
側ポートと第２切換弁の試料入口側導入路に通じ
るよう設けられた連結路のポートとに切換可能に
構成され、第２切換弁が比較セル側ポートを試料
ガス入口側ポートと特定成分吸収器を介して前記
連結路に通じるよう設けられた吸収路のポートと
に切換可能に構成され、
(i) 第１切換弁の試料ガス入口側ポートと測定セ
ル側ポートとを連結させると共に第２切換弁の
試料ガス入口側ポートと比較セル側ポートとを
連通させると、両試料ガス中の特定成分の濃度
差を測定でき、
(ii) 第１切換弁を(i)の連通状態にして第２切換弁
の比較セル側ポートと前記吸収路のポートとを
連結させると、第１試料ガスの絶対濃度を測定
でき、
(iii) 第２切換弁を(ii)の連通状態にして第１切換弁
の前記連結路のポートと測定セル側ポートとを
連通させると、第２試料ガスの絶対濃度を測定
できるガス濃度測定装置である。 This invention was made in view of these circumstances, and its specific configuration includes a non-dispersive infrared gas analyzer equipped with a light source, opposing measurement and comparison cells, a detector, etc., and a sample gas analyzer in which a sample gas is introduced into the measurement cell. A first sample gas introduction path that can introduce another sample gas into the comparison cell, a second sample gas introduction path that can introduce another sample gas into the comparison cell, and first and second switching valves that are respectively interposed in these sample gas introduction paths. , the first switching valve is configured to be able to switch the measurement cell side port between the sample gas inlet side port and a port of a connecting path provided to communicate with the sample inlet side introduction path of the second switching valve, and the second switching valve The comparison cell side port is configured to be switchable between a sample gas inlet side port and a port of an absorption path provided to communicate with the connection path via a specific component absorber, (i) a sample gas inlet of the first switching valve; By connecting the side port and the measurement cell side port and communicating the sample gas inlet side port of the second switching valve with the comparison cell side port, it is possible to measure the concentration difference of a specific component in both sample gases, (ii) When the first switching valve is in the communication state (i) and the comparison cell side port of the second switching valve is connected to the port of the absorption path, the absolute concentration of the first sample gas can be measured; The gas concentration measuring device is capable of measuring the absolute concentration of the second sample gas when the switching valve is placed in the communicating state (ii) and the port of the connection path of the first switching valve communicates with the measurement cell side port.
すなわち、この発明は、非分散形赤外線ガス分
析計の測定セルと比較セルのそれぞれに試料ガス
導入路を設け、更に両試料ガス導入路にそれぞれ
切換弁を介接すると共に両試料ガス導入路の連結
路と比較セル側試料ガス導入路に特定成分吸収路
とを切換弁に関連して付設することによつて、２
つの試料ガス中の特定成分の濃度差及び絶対濃度
を測定できるようにするものであり、１台の分析
計のみを用い簡単な切換操作にて、実際の使用目
的（例えば研究）に適した測定が可能になる。も
ちろん標準ガスとしての高価な窒素ガスが不要に
なる効果もある（比較セル導入用窒素ガス、分析
計のパージガス用窒素ガスが不要）。 That is, the present invention provides a sample gas introduction path in each of the measurement cell and the comparison cell of a non-dispersive infrared gas analyzer, further interposes a switching valve in each of both sample gas introduction paths, and connects both sample gas introduction paths. By attaching a specific component absorption path to the comparison cell side sample gas introduction path in conjunction with the switching valve, 2.
This enables the measurement of the concentration difference and absolute concentration of specific components in two sample gases, and allows measurement suitable for the actual purpose of use (for example, research) by using only one analyzer and simple switching operations. becomes possible. Of course, this also has the effect of eliminating the need for expensive nitrogen gas as a standard gas (nitrogen gas for introducing the comparison cell and nitrogen gas for purge gas of the analyzer are unnecessary).
この発明は更に第２試料ガス導入路から特定成
分吸収器を介して分析計の光学系の隙間にパージ
ガスを供給できるようにすることによつて、雰囲
気ガスの影響を受けない正確で高感度の濃度測定
を可能にする。 This invention further provides an accurate and highly sensitive system that is unaffected by atmospheric gas by supplying purge gas from the second sample gas introduction path to the gap in the optical system of the analyzer via the specific component absorber. Enables concentration measurements.
この発明に係るガス濃度測定装置で測定可能な
成分（特定成分）としては。例えば炭酸ガス
（CO2）、一酸化炭素（CO）、亜硫酸ガス（SO2）、
一酸化窒素（NO）等が挙げられる。 Components (specific components) that can be measured with the gas concentration measuring device according to the present invention include: For example, carbon dioxide (CO 2 ), carbon monoxide (CO), sulfur dioxide (SO 2 ),
Examples include nitric oxide (NO).
従つて炭酸ガス濃度測定の場合には、植物の炭
酸同化作用、小動物の呼吸作用などの実験研究
や、大気中又は室内の炭酸ガス濃度の連続測定な
どに好適に利用できる。 Therefore, in the case of measuring carbon dioxide concentration, it can be suitably used for experimental research on carbon dioxide assimilation in plants, respiration in small animals, and continuous measurement of carbon dioxide concentration in the atmosphere or indoors.
この発明に係るガス濃度測定装置において、使
用される特定成分吸収器の吸収剤としては、特定
成分が炭酸ガスの場合、ソーダ石灰、アスカライ
ト（商標、水酸化ナトリウムと石綿で製造したも
の）などが好ましいものとして挙げられる。 In the gas concentration measuring device according to the present invention, when the specific component is carbon dioxide, the absorbent used in the specific component absorber includes soda lime, ascarite (trademark, made from sodium hydroxide and asbestos), etc. are listed as preferred.
以下図に示す実施例に基づいてこの発明を詳述
する。なお、これによつてこの発明が限定される
ものではない。 The present invention will be described in detail below based on embodiments shown in the figures. Note that this invention is not limited to this.
第１図において、炭酸ガス濃度測定装置１は、
非分散形赤外線ガス分析計２と、この分析計の測
定セル３及び比較セル４にそれぞれ測定ガスを前
処理して導入できる第１・第２試料ガス導入路
５，６とから主として構成されている。なお、７
は分析計の光源、８は両セル３，４の炭酸ガス濃
度差を出力できる検出器、９はチヨツパである。 In FIG. 1, the carbon dioxide concentration measuring device 1 is
It mainly consists of a non-dispersive infrared gas analyzer 2, and first and second sample gas introduction paths 5 and 6 that can pre-process and introduce the measurement gas into the measurement cell 3 and comparison cell 4 of this analyzer, respectively. There is. In addition, 7
8 is a light source of an analyzer, 8 is a detector capable of outputting the difference in carbon dioxide concentration between both cells 3 and 4, and 9 is a chopper.
第１試料ガス導入路５は、試料ガス注入口１
０、除湿を行なう電子クーラ１１、第１切換弁１
２、流量調整用ニードル弁１３、ポンプ１４、フ
イルタ１５及び流量計１６をこの順に連接して構
成されている。なお、１７はドレンポツトであ
る。一方第２試料ガス導入路６も同様の構成を備
えると共にフイルタ１５ａと流量計１６ａとの間
から分岐路１８を付設している。 The first sample gas introduction path 5 includes the sample gas inlet 1
0, electronic cooler 11 that dehumidifies, first switching valve 1
2. It is constructed by connecting a needle valve 13 for flow rate adjustment, a pump 14, a filter 15, and a flow meter 16 in this order. Note that 17 is a drain pot. On the other hand, the second sample gas introduction path 6 also has a similar configuration and is provided with a branch path 18 between the filter 15a and the flow meter 16a.
第１・第２切換弁１２，１２ａは、いずれも第
５ポートを第１〜４ポートにそれぞれ切換えられ
るよう構成されている。 The first and second switching valves 12 and 12a are each configured to switch the fifth port to the first to fourth ports, respectively.
両試料ガス導入路５，６は、２つの連結路１
９，２０で連結され、更に連結路１９の途中から
第２試料ガス導入路６に延びる炭酸ガス吸収路２
１を備えている。連結路１９は第１切換弁１２の
第２ポートと、第２試料ガス導入路６の電子ク
ーラ１１ａと第２切換弁１２ａとの間ａとを連結
し、その連結路１９の途中ｂと第２切換弁１２ａ
の第４ポートａとの間に炭酸ガス吸収路２１を
連結している。なお、２２は炭酸ガスを吸収する
吸収剤（例：ソーダ石灰）を充填した吸収器であ
る。一方連結路２０は第１切換弁１２の第３ポー
トと第２試料ガス導入路６のニードル弁１３ａ
と第２切換弁１２ａとの間ｃとを連結している。 Both sample gas introduction paths 5 and 6 are connected to two connection paths 1
9 and 20, and further extends from the middle of the connecting path 19 to the second sample gas introduction path 6.
1. The connecting path 19 connects the second port of the first switching valve 12 and the gap a between the electronic cooler 11a and the second switching valve 12a of the second sample gas introduction path 6, and 2 switching valve 12a
A carbon dioxide absorption path 21 is connected between the fourth port a and the fourth port a. Note that 22 is an absorber filled with an absorbent (eg, soda lime) that absorbs carbon dioxide gas. On the other hand, the connection path 20 is connected to the third port of the first switching valve 12 and the needle valve 13a of the second sample gas introduction path 6.
and the second switching valve 12a are connected to each other.
分岐路１８はニードル弁２３と炭酸ガス（特定
成分）を吸収する前記吸収器２２と同様の吸収器
２４とを経て分析計２内に開口し、後述するごと
く光源７、両セル３，４、検出器８等の光学系の
隙間にパージガスを供給できるよう構成されてい
る。 The branch path 18 opens into the analyzer 2 via a needle valve 23 and an absorber 24 similar to the absorber 22 that absorbs carbon dioxide gas (specific component), and is connected to a light source 7, both cells 3 and 4, as described later. It is configured so that purge gas can be supplied to gaps in the optical system such as the detector 8.
次に以上の構成からなる炭酸ガス濃度測定装置
１の作動を説明する。 Next, the operation of the carbon dioxide concentration measuring device 1 having the above configuration will be explained.
(イ) 濃度差測定
第１・第２切換弁１２，１２ａ共第１ポート
，ａと第５ポート，ａとが連通するよ
う設定し、両試料ガス導入路５，６から試料ガ
スＡ，Ｂをそれぞれ非分散形赤外線ガス分析計
の測定セル３と比較セル４に導入すれば、両試
料ガスＡ，Ｂの濃度差が測定できる。例えばマ
ウスの呼吸作用を研究する場合は、マウスを入
れた部屋を通過したガスをＡ、マウスを入れた
部屋に供給した供給ガス自体をＢとすれば、マ
ウスの呼吸状態（変化）が連続して測定でき
る。(a) Concentration difference measurement Both the first and second switching valves 12 and 12a are set so that the first port, a and the fifth port, a communicate with each other, and sample gases A and B are supplied from both sample gas introduction paths 5 and 6. By introducing these into the measurement cell 3 and comparison cell 4 of a non-dispersive infrared gas analyzer, the concentration difference between both sample gases A and B can be measured. For example, when studying the respiratory effects of mice, let A be the gas that has passed through the room containing the mouse, and B be the gas supplied to the room containing the mouse, so that the respiratory state (changes) of the mouse can be continuously It can be measured by
(ロ) 絶対濃度測定
(イ)の状態から第２切換弁１２ａを操作し第４
ポートａと第５ポートａを連通させる。つ
まり、試料ガスＢは連結路１９を通り、その途
中から吸収路２１を通つて炭酸ガスを除去され
第２切換弁１２ａにもどり、比較セル４へ向か
う。従つて比較セル４の試料ガスＢの炭酸ガス
濃度はゼロとなり、両セル３，４の濃度差、つ
まり試料ガスＡの炭酸ガス絶対濃度が検出器８
により出力される。(b) Absolute concentration measurement From the state of (a), operate the second switching valve 12a and
Port a and fifth port a are communicated. In other words, the sample gas B passes through the connection path 19, passes through the absorption path 21 midway through the connection path, removes carbon dioxide gas, returns to the second switching valve 12a, and heads toward the comparison cell 4. Therefore, the carbon dioxide concentration of sample gas B in comparison cell 4 is zero, and the concentration difference between both cells 3 and 4, that is, the absolute carbon dioxide concentration of sample gas A, is detected by detector 8.
is output by
続いて第１切換弁１２を操作し、第２ポート
と第５ポートを連通させると、比較セル３
にはそのまま試料ガスＢの炭酸ガス濃度ゼロの
ものが導入されるが、測定セル３には試料ガス
Ａに代つて試料ガスＢが連結路１９を通じて導
入される。かくして、両セル３，４の濃度差、
つまり測定セル３の試料ガスＢの炭酸ガス絶対
濃度が検出器８により出力される。なお、従来
では比較セルに窒素ガス（乾燥状態）を用いて
いたので、測定セルの試料ガス中の水分の干渉
による誤差がさけられなかつたが、上記方法で
は誤差がキヤンセルできる。 Subsequently, when the first switching valve 12 is operated to connect the second port and the fifth port, the comparison cell 3
Sample gas B with a carbon dioxide concentration of zero is introduced into the measurement cell 3 as it is, but sample gas B is introduced into the measurement cell 3 through the connection path 19 instead of the sample gas A. Thus, the concentration difference between both cells 3 and 4,
That is, the absolute carbon dioxide concentration of the sample gas B in the measurement cell 3 is outputted by the detector 8. In the past, since nitrogen gas (dry state) was used in the comparison cell, errors due to interference of moisture in the sample gas of the measurement cell were unavoidable, but the above method can cancel the errors.
(ハ) ゼロ調整
(i) 試料ガスによる濃度差ゼロ調整
第１切換弁１２を第３ポートと第５ポー
トとが連通するよう操作し、第２切換弁１
２ａを第４ポートと第５ポートａとが連
通するよう操作すると、比較セル４と共に連
結路１９を介して測定セル３にも同じ試料ガ
スＢが導入される。従つて検出器８からは濃
度差ゼロが出力されるべきであり、ゼロ調整
が可能となる。(c) Zero adjustment (i) Zero adjustment of concentration difference due to sample gas Operate the first switching valve 12 so that the third port and the fifth port communicate with each other, and then
When 2a is operated so that the fourth port and the fifth port a communicate with each other, the same sample gas B is introduced into the measurement cell 3 as well as the comparison cell 4 via the connection path 19. Therefore, the detector 8 should output a concentration difference of zero, making zero adjustment possible.
(ii) 標準ガスによる濃度差ゼロ・スパン調整
第２切換弁１２ａを第２ポートａと第５
ポートａとが連通するよう操作し、標準ガ
ス（350ppmの低濃度CO2）をSTDLより流
入させ、一方第１切換弁１２を第３ポート
と第５ポートとが連通するよう操作する。
かくしてガス分析計の測定セル３と比較する
４に同じ350ppmのCO2が流れこの状態で濃
度差のメータメモリをゼロに調整できる。 (ii) Zero concentration difference and span adjustment using standard gas The second switching valve 12a is connected to the second port a and the fifth port
Port a is operated to communicate with the port a, and standard gas (350 ppm low concentration CO 2 ) is allowed to flow in from STDL, while the first switching valve 12 is operated so that the third port and the fifth port are communicated with each other.
In this way, the same 350 ppm of CO 2 flows into measurement cell 3 and comparison cell 4 of the gas analyzer, and in this state, the meter memory of the concentration difference can be adjusted to zero.
次に上記の状態から第１切換弁１２を第４
ポートと第５ポートとが連通するよう操
作し、標準ガス（400ppmの高濃度CO2）を
STDHから流入させ、分析計の濃度差の指
示が＋50ppmを指すようにスパンボリユウム
を調整する。なお、測定セル４には400ppm
のCO2、一方比較セル４には350ppmのCO2
がそれぞれ流れている。 Next, from the above state, switch the first switching valve 12 to the fourth
Operate the port so that it communicates with the 5th port, and supply standard gas (high concentration CO 2 of 400ppm).
Flow in from STDH and adjust the span volume so that the concentration difference reading on the analyzer points to +50 ppm. In addition, measurement cell 4 contains 400ppm.
of CO 2 , while comparison cell 4 had 350 ppm CO 2
are flowing respectively.
以上の構成により標準ガスによる濃度差測
定レンジの校正が可能になる。 The above configuration makes it possible to calibrate the concentration difference measurement range using the standard gas.
(iii) 標準ガスによる絶対濃度ゼロ・スパン調整
上記濃度差ゼロ調整終了後次の絶対濃度ゼ
ロ・スパン調整を行う。まず第２切換弁１２
ａを第３ポートａと第５ポートａとが連
通するよう操作し、N2ガス入口よりN2を流
入させ、第１切換弁１２を第３ポートと第
５ポートとが連通するよう操作する。かく
してガス分析計の両セルにN2が導入される。
この状態で絶対濃度のメータ目盛のゼロ調整
が可能になる。 (iii) Absolute concentration zero/span adjustment using standard gas After completing the above concentration difference zero adjustment, perform the next absolute concentration zero/span adjustment. First, the second switching valve 12
a so that the third port a and the fifth port a communicate with each other, N2 is introduced from the N2 gas inlet, and the first switching valve 12 is operated so that the third port and the fifth port communicate with each other. . N 2 is thus introduced into both cells of the gas analyzer.
In this state, the absolute concentration meter scale can be zero-adjusted.
続いて上記状態から第１切換弁１２を第４
ポートと第５ポートとが連通するよう操
作し、STBHから標準ガス（400ppmのCO2）
を流入させる。かくして分析計の指示を
400ppm（スパン点）になるようスパンボリユ
ウムで合わせる。なお、この時の測定側には
400ppmのCO2、一方比較側にはN2がそれぞ
れ流れている。かくして絶対濃度測定レンジ
の標準ガスによる校正が可能になる。 Subsequently, from the above state, the first switching valve 12 is switched to the fourth switching valve.
Operate the port so that it communicates with the 5th port, and supply standard gas (400ppm CO 2 ) from the STBH.
inflow. Thus, the spectrometer instructions
Adjust with span volume to make it 400ppm (span point). In addition, on the measurement side at this time,
400 ppm of CO 2 is flowing on the comparison side, while N 2 is flowing on the comparison side. In this way, it becomes possible to calibrate the absolute concentration measurement range using the standard gas.
(ニ) パージ
分岐路１８を通じて炭酸ガスを含まない試料
ガスを分析計２の光学系の隙間に供給する。な
お、パージガスは流量をできるだけ少なくする
ために上述のごとく、分析計の光源７、両セル
３，４、検出器８等の光学系の隙間のみに供給
されるのが望ましい。(d) Purge A sample gas that does not contain carbon dioxide is supplied to the gap in the optical system of the analyzer 2 through the branch path 18. In order to reduce the flow rate as much as possible, the purge gas is desirably supplied only to the gaps between the optical system of the analyzer, such as the light source 7, both cells 3 and 4, and the detector 8, as described above.
第１図はこの発明のガス濃度測定装置の一実施
例を示す構成説明図である。
１……炭酸ガス濃度測定装置、３……測定セ
ル、４……比較セル、５……第１試料ガス導入
路、６……第２試料ガス導入路、７……光源、８
……検出器、１０……試料ガス注入口、１２……
第１切換弁、１８……分岐路、１９……連結路、
２１……炭酸ガス吸収路。
FIG. 1 is a configuration explanatory diagram showing an embodiment of the gas concentration measuring device of the present invention. DESCRIPTION OF SYMBOLS 1... Carbon dioxide concentration measuring device, 3... Measurement cell, 4... Comparison cell, 5... First sample gas introduction path, 6... Second sample gas introduction path, 7... Light source, 8
...Detector, 10...Sample gas inlet, 12...
First switching valve, 18... Branch road, 19... Connecting road,
21...Carbon dioxide absorption path.
Claims (1)
器等を備えた非分散形赤外線ガス分析計と、測定
セルに試料ガスを導入できる第１試料ガス導入路
と、比較セルに他の試料ガスを導入できる第２試
料ガス導入路と、これらの試料ガス導入路にそれ
ぞれ介接された第１・第２切換弁とを備え、 第１切換弁が測定セル側ポートを試料ガス入口
側ポートと第２切換弁の試料入口側導入路に通じ
るよう設けられた連結路のポートとに切換可能に
構成され、第２切換弁が比較セル側ポートを試料
ガス入口側ポートと特定成分吸収器を介して前記
連結路に通じるよう設けられた吸収路のポートと
に切換可能に構成され、 (i) 第１切換弁の試料ガス入口側ポートと測定セ
ル側ポートとを連結させると共に第２切換弁の
試料ガス入口側ポートと比較セル側ポートとを
連通させると、両試料ガス中の特定成分の濃度
差を測定でき、 (ii) 第１切換弁を(i)の連通状態にして第２切換弁
の比較セル側ポートと前記吸収路のポートとを
連結させると、第１試料ガスの絶対濃度を測定
でき、 (iii) 第２切換弁を(ii)の連通状態にして第１切換弁
の前記連結路のポートと測定セル側ポートとを
連通させると、第２試料ガスの絶対濃度を測定
できるガス濃度測定装置。 ２ 光源、対向する測定セル及び比較セル、検出
器等を備えた非分散形赤外線ガス分析計と、測定
セルに試料ガスを導入できる第１試料ガス導入路
と、比較セルに他の試料ガスを導入できる第２試
料ガス導入路と、これらの試料ガス導入路にそれ
ぞれ介接された第１・第２切換弁とを備え、 第１切換弁が測定セル側ポートを試料ガス入口
側ポートと第２切換弁の試料入口側導入路に通じ
るよう設けられた連結路のポートとに切換可能に
構成され、第２切換弁が比較セル側ポートを試料
ガス入口側ポートと特定成分吸収器を介して前記
連結路に通じるよう設けられた吸収路のポートと
に切換可能に構成され、 (i) 第１切換弁の試料ガス入口側ポートと測定セ
ル側ポートとを連結させると共に第２切換弁の
試料ガス入口側ポートと比較セル側ポートとを
連通させると、両試料ガス中の特定成分の濃度
差を測定でき、 (ii) 第１切換弁を(i)の連通状態にして第２切換弁
の比較セル側ポートと前記吸収路のポートとを
連結させると、第１試料ガスの絶対濃度を測定
でき、 (iii) 第２切換弁を(ii)の連通状態にして第１切換弁
の前記連結路のポートと測定セル側ポートとを
連通させると、第２試料ガスの絶対濃度を測定
でき、 更に第２切換弁より比較セル側の第２試料ガス
導入路から分岐し前記吸収路に介設された特定成
分吸収器とは異なるもう１つの特定成分吸収器を
介して前記非分散形赤外線ガス分析計内に開口す
る分岐路を付設し、その分析計内の光源、測定セ
ル及び比較セル、検出器等の光学系の〓間にパー
ジガスを供給できるガス濃度測定装置。[Scope of Claims] 1. A non-dispersive infrared gas analyzer equipped with a light source, an opposing measurement cell, a comparison cell, a detector, etc., a first sample gas introduction path through which a sample gas can be introduced into the measurement cell, and a comparison cell. A second sample gas introduction path through which another sample gas can be introduced into the sample gas, and first and second switching valves respectively interposed in these sample gas introduction paths, and the first switching valve connects the measurement cell side port to the sample gas. The port is configured to be switchable between the gas inlet side port and the port of the connection path provided to communicate with the sample inlet side introduction path of the second switching valve, and the second switching valve identifies the comparison cell side port as the sample gas inlet side port. (i) connects the sample gas inlet side port of the first switching valve and the measurement cell side port; By communicating the sample gas inlet side port of the second switching valve with the comparison cell side port, the concentration difference of a specific component in both sample gases can be measured. (iii) When the comparison cell side port of the second switching valve is connected to the port of the absorption path, the absolute concentration of the first sample gas can be measured. A gas concentration measuring device capable of measuring the absolute concentration of a second sample gas by communicating the port of the connection path of the first switching valve with the measurement cell side port. 2. A non-dispersive infrared gas analyzer equipped with a light source, an opposing measurement cell, a comparison cell, a detector, etc., a first sample gas introduction path through which a sample gas can be introduced into the measurement cell, and another sample gas into the comparison cell. It is equipped with a second sample gas introduction path through which the sample gas can be introduced, and first and second switching valves respectively interposed in these sample gas introduction paths, and the first switching valve connects the measurement cell side port to the sample gas inlet side port and the second The second switching valve is configured to be able to switch between the comparison cell side port and the sample gas inlet side port via the specific component absorber. (i) connects the sample gas inlet side port of the first switching valve and the measurement cell side port, and connects the sample gas inlet side port of the first switching valve with the sample gas inlet port of the second switching valve; By connecting the gas inlet side port and the comparison cell side port, the concentration difference of a specific component in both sample gases can be measured. By connecting the comparison cell side port and the port of the absorption path, the absolute concentration of the first sample gas can be measured; When the port of the channel and the port on the measurement cell side are connected, the absolute concentration of the second sample gas can be measured, and furthermore, the second sample gas introduction channel on the comparison cell side is branched from the second switching valve and interposed in the absorption channel. A branch path is provided that opens into the non-dispersive infrared gas analyzer through another specific component absorber different from the specific component absorber that has been used, and a light source, a measurement cell and a comparison cell in the analyzer, A gas concentration measuring device that can supply purge gas between optical systems such as detectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4420182A JPS58160849A (en) | 1982-03-18 | 1982-03-18 | Measuring apparatus of gas concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4420182A JPS58160849A (en) | 1982-03-18 | 1982-03-18 | Measuring apparatus of gas concentration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58160849A JPS58160849A (en) | 1983-09-24 |
| JPS642889B2 true JPS642889B2 (en) | 1989-01-19 |
Family
ID=12684949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4420182A Granted JPS58160849A (en) | 1982-03-18 | 1982-03-18 | Measuring apparatus of gas concentration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58160849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8749789B2 (en) | 2010-12-27 | 2014-06-10 | Horiba, Ltd. | Gas concentration measuring apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5221881B2 (en) * | 2007-02-09 | 2013-06-26 | 大陽日酸株式会社 | Gas analyzer |
| JP7521295B2 (en) * | 2020-07-20 | 2024-07-24 | 株式会社島津製作所 | Total organic carbon meter and method for measuring total organic carbon concentration |
-
1982
- 1982-03-18 JP JP4420182A patent/JPS58160849A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8749789B2 (en) | 2010-12-27 | 2014-06-10 | Horiba, Ltd. | Gas concentration measuring apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58160849A (en) | 1983-09-24 |
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