JPH065622Y2 - FID analyzer - Google Patents
FID analyzerInfo
- Publication number
- JPH065622Y2 JPH065622Y2 JP1987196352U JP19635287U JPH065622Y2 JP H065622 Y2 JPH065622 Y2 JP H065622Y2 JP 1987196352 U JP1987196352 U JP 1987196352U JP 19635287 U JP19635287 U JP 19635287U JP H065622 Y2 JPH065622 Y2 JP H065622Y2
- Authority
- JP
- Japan
- Prior art keywords
- current value
- current
- gas
- mixed gas
- output
- 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 - Lifetime
Links
- 239000007789 gas Substances 0.000 claims description 42
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 20
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Landscapes
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、ＦＩＤ(FIame IonizationDetector)分析計の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a FID (FIame Ionization Detector) analyzer.
上記のＦＩＤ分析計は、水素ガスとサンプルガスとの混
合ガスの燃焼域近傍に高電圧電極とコレクタ電極を設け
ると共に、前記コレクタ電極に電流測定回路を接続して
成るもので、前記混合ガスを燃焼させると、その高温の
炎のエネルギーによってイオン化が起こり、サンプルガ
ス中に含まれる炭素量に比例したイオン化電流が前記両
電極間に流れて、その電流が前記コレクタ電極に接続の
電流測定回路に出力されるもので、この電流値を基にし
て前記サンプルガス中の炭化水素の量が分析されるよう
になっている。The above-mentioned FID analyzer comprises a high-voltage electrode and a collector electrode in the vicinity of a combustion region of a mixed gas of hydrogen gas and sample gas, and a current measuring circuit connected to the collector electrode. When burned, ionization occurs due to the energy of the high-temperature flame, an ionization current proportional to the amount of carbon contained in the sample gas flows between the electrodes, and the current flows in the current measurement circuit connected to the collector electrode. It is output, and the amount of hydrocarbons in the sample gas is analyzed based on this current value.
ところで、何等かの原因で前記混合ガスが着火しなかっ
たり、燃焼中のガスが消えてしまうと、前記サンプルガ
スに含まれる炭化水素量の測定が不能になるだけでな
く、燃料用の水素ガスを含む未燃焼の混合ガスがそのま
ま系外に放散されることから、非常に危険な事態に陥る
こととなる。By the way, if the mixed gas does not ignite for some reason, or if the burning gas disappears, not only is it impossible to measure the amount of hydrocarbons contained in the sample gas, but also hydrogen gas for fuel is used. Since the unburned mixed gas containing is released to the outside of the system as it is, a very dangerous situation occurs.
そこで従来は、前記混合ガスが正常に燃焼しているとき
に生じるイオン化電流の下限の電流値を基準電流値とし
て、該基準電流値と前記電流測定回路に出力される電流
値とを比較し、前記出力電流値が前記基準電流値よりも
低いときの比較結果を基にして、前記混合ガスの未着火
状態あるいは消炎状態（以下、便宜上消炎時について説
明する）を検出させるようにしている。Therefore, conventionally, the lower limit current value of the ionization current generated when the mixed gas normally burns is set as a reference current value, and the reference current value and the current value output to the current measuring circuit are compared, Based on the comparison result when the output current value is lower than the reference current value, the unignited state or the extinguished state of the mixed gas (hereinafter, the extinction state will be described for convenience) is detected.
しかし、前記コレクタ電極と高電圧電極間に絶縁不良が
生じた場合、その部分においてインピーダンス低下が生
じ、その後段に設けられるアンプにおいて、その特性か
ら正方向に大きな出力が生じ、電流測定回路に大きな電
流が流れる。そして、このような場合、燃えている炎が
消えてもこれが検出されず、非常に危険な事態に陥る重
大な問題があったのである。However, when insulation failure occurs between the collector electrode and the high-voltage electrode, impedance is reduced at that portion, and in the amplifier provided in the subsequent stage, a large output is generated in the positive direction due to the characteristic, and a large current measurement circuit is generated. An electric current flows. In such a case, even if the burning flame disappeared, this was not detected, and there was a serious problem of falling into a very dangerous situation.
本考案は、かかる実情に鑑みて成されたものであって、
極めて簡単な改良によって安全性の向上を図らんことを
目的としている。The present invention has been made in view of such circumstances,
The aim is to improve safety by making extremely simple improvements.
上記の目的を達成するために本考案は、水素ガスとサン
プルガスとの混合ガスの燃焼域近傍に高電圧電極とコレ
クタ電極を設けると共に、前記混合ガスの燃焼によって
上記両電極間に生じるイオン化電流を測定する電流測定
回路を前記コレクタ電極に接続して成るＦＩＤ分析計に
おいて、前記混合ガスが正常に燃焼しているときのイオ
ン化電流の上下限の電流値を基準電流値として、該基準
電流値と前記電流測定回路に出力される電流値とを比較
する比較手段を設けると共に、前記出力電流値が前記基
準電流値の下限または上限を外れたことの比較結果を基
にして前記水素ガスの供給を停止させる手段を設けた点
に特徴がある。In order to achieve the above object, the present invention provides a high voltage electrode and a collector electrode in the vicinity of a combustion region of a mixed gas of hydrogen gas and a sample gas, and an ionization current generated between the electrodes by the combustion of the mixed gas. In a FID analyzer comprising a current measuring circuit for measuring the above, which is connected to the collector electrode, the reference current values are the upper and lower limit current values of the ionization current when the mixed gas is normally burning. And a current value output to the current measuring circuit are provided with a comparison means, and the hydrogen gas is supplied based on the comparison result that the output current value is out of the lower limit or the upper limit of the reference current value. It is characterized in that a means for stopping is provided.
上記の特徴構成によれば、混合ガスの未着火や消炎によ
って電流測定回路に電流が流れなくなったり、あるい
は、前記両電極間での絶縁不良の発生等によって電流測
定回路に大きな電流が流れたりして、前記電流測定回路
に出力される電流値が前記基準電流値の下限または上限
を外れると、自動的に水素ガスの供給が断たれて安全性
が確保される。According to the above characteristic configuration, the current does not flow in the current measurement circuit due to non-ignition or extinction of the mixed gas, or a large current flows in the current measurement circuit due to occurrence of insulation failure between the both electrodes. When the current value output to the current measuring circuit deviates from the lower limit or the upper limit of the reference current value, the hydrogen gas supply is automatically cut off to ensure safety.
以下、本考案の実施例を図面に基づいて説明する。図面
は本考案に係るＦＩＤ分析計の一構成例を示し、図にお
いて、１は検出器で、その内部にサンプルガスと水素ガ
スとの混合ガスを燃焼させるバーナー２を設けると共
に、該バーナー２の燃焼域近傍（具体的には燃焼炎の周
囲）に、電流測定回路３を接続するためのコレクタ電極
４が設けられ、かつ、前記バーナー２には、高圧配線５
を介して数100Vの高電圧を印加する高圧電源６が接続さ
れていて、当該バーナー２そのものが高電圧電極７に構
成されている。Embodiments of the present invention will be described below with reference to the drawings. The drawing shows an example of the configuration of the FID analyzer according to the present invention. In the drawing, 1 is a detector, inside of which a burner 2 for burning a mixed gas of sample gas and hydrogen gas is provided, and the burner 2 A collector electrode 4 for connecting a current measuring circuit 3 is provided near the combustion region (specifically, around the combustion flame), and the burner 2 has a high-voltage wiring 5
A high-voltage power source 6 for applying a high voltage of several hundreds of volts is connected via the, and the burner 2 itself is configured as a high-voltage electrode 7.
８はサンプルガスの供給ライン、９は水素ガスの供給ラ
イン、10は空気等の助燃ガスの供給ラインであり、各ラ
イン８，９，10にはガスの供給を停止させるための電磁
弁Ｖ１，Ｖ２，Ｖ３が設けられている。11は着火装置と
しての点火プラグ、12は排気ガスラインである。Reference numeral 8 is a sample gas supply line, 9 is a hydrogen gas supply line, and 10 is an auxiliary combustion gas supply line such as air. Each line 8, 9, 10 is a solenoid valve V 1 for stopping the supply of gas. , V 2 , V 3 are provided. 11 is a spark plug as an ignition device, and 12 is an exhaust gas line.
前記電流測定回路３は、前記混合ガスの燃焼によって電
極４，７間に生じるイオン化電流を増幅するアンプ回路
13からの電流値を測定し記録するもので、１８は記録計
である。１５はアンプ回路１３の後段に設けられる校正
回路で、この校正回路１３の後段には、前記電流測定回
路３と異常検出回路１４とが並列的に設けられている。
前記異常検出回路14は、前記混合ガスが正常に燃焼して
いるときに生じる増幅されたイオン化電流の上下限の電
流値を基準電流値として、前記アンプ回路13から校正回
路15を経て出力される電流値が前記基準電流値の範囲内
にあるか否かを比較検出する比較手段16と、前記出力電
流値が前記基準電流値の下限または上限を外れたことの
比較結果を基にして前記水素ガス用の電磁弁Ｖ２を閉じ
させる水素ガスの供給停止手段17とから成る。The current measuring circuit 3 is an amplifier circuit for amplifying an ionizing current generated between the electrodes 4 and 7 due to the combustion of the mixed gas.
The current value from 13 is measured and recorded, and 18 is a recorder. Reference numeral 15 is a calibration circuit provided in the latter stage of the amplifier circuit 13, and in the latter stage of the calibration circuit 13, the current measuring circuit 3 and the abnormality detection circuit 14 are provided in parallel.
The abnormality detection circuit 14 is output from the amplifier circuit 13 via the calibration circuit 15 as the reference current value of the upper and lower limit current values of the amplified ionized current generated when the mixed gas is normally burned. Comparison means 16 for comparing and detecting whether or not the current value is within the range of the reference current value, and the hydrogen based on the comparison result that the output current value is out of the lower limit or the upper limit of the reference current value. And a hydrogen gas supply stopping means 17 for closing the electromagnetic valve V 2 for gas.
前記比較手段16の詳しくは、前記基準電流値の上限電流
値よりもやゝ大きい値の比較電流が入力される上限比較
器16ａと、前記基準電流値の下限電流値よりもやゝ小さ
い値の比較電流が入力される下限比較器16ｂを、前記校
正回路15の下流側に並列接続して成る。For details of the comparison means 16, an upper limit comparator 16a to which a comparison current having a value slightly larger than the upper limit current value of the reference current value is input, and a value of a value slightly smaller than the lower limit current value of the reference current value. A lower limit comparator 16b to which a comparison current is input is connected in parallel to the downstream side of the calibration circuit 15.
上記の構成によれば、前記検出器１内において混合ガス
を燃焼させると、そのときの炎のエネルギーによってイ
オン化電流が生じ、サンプルガス中に含まれる炭素量に
比例した電流が増幅されて電流測定回路３に出力され、
前記サンプルガス中の炭素の量が記録計18に記録され
る。According to the above configuration, when the mixed gas is burned in the detector 1, the energy of the flame at that time causes an ionization current, and the current proportional to the amount of carbon contained in the sample gas is amplified to measure the current. Output to circuit 3,
The amount of carbon in the sample gas is recorded in the recorder 18.
ここで、前記消炎が生ずると、前記電極４，７間でイオ
ン化電流が生じなくなり、前記比較手段16に電流が出力
されなくなる。When the extinction occurs, no ionization current is generated between the electrodes 4 and 7, and no current is output to the comparison means 16.
このように、前記比較手段16に電流が出力されなくなっ
て、前記出力電流値が前記基準電流値の下限を下回った
ことが前記下限比較器16ｂによって検出されると、前記
水素ガス用の電磁弁Ｖ２が閉じられて水素ガスの供給停
止と同時に、異常事態の発生を報知するアラーム19が作
動される。As described above, when the lower limit comparator 16b detects that the output current value is below the lower limit of the reference current value because the current is no longer output to the comparing means 16, the solenoid valve for hydrogen gas is detected. When V 2 is closed and the supply of hydrogen gas is stopped, an alarm 19 for informing the occurrence of an abnormal situation is activated.
尚、混合ガスの着火が所定通りに行われないときにも、
これを消炎と見做す上記通りの制御が行われることは言
うまでもない。In addition, even when the ignition of the mixed gas is not performed as prescribed,
It goes without saying that the control as described above, which regards this as extinction, is performed.
一方、前記コレクタ電極４と高電圧電極７との間に絶縁
不良が生じた場合は、前記混合ガスが燃焼しているか否
かにかかわらず、前記比較手段16に前記基準電流値の上
限を上回る大きな値の電流が出力される。On the other hand, when insulation failure occurs between the collector electrode 4 and the high voltage electrode 7, the comparison means 16 exceeds the upper limit of the reference current value regardless of whether the mixed gas is burning. A large value of current is output.
而して、かかる異常事態が前記上限比較器16ａによって
比較検出されると、上記消炎が生じたときと同様に、前
記水素ガス用の電磁弁Ｖ２が閉じられて水素ガスの供給
が停止されると同時にアラーム19が作動される。And Thus, when such abnormal state is compared detected by the upper limit comparator 16a, as in the case where the quenching occurs, the solenoid valve V 2 is closed for the hydrogen gas supply of hydrogen gas is stopped Alarm 19 is activated at the same time.
即ち、混合ガスの未着火や消炎を生じたとき、あるい
は、混合ガスの燃焼が正常に行われているか否かを問わ
ず電気系に異常事態が発生したときに、前記水素ガスの
供給を停止させて、混合ガスの燃焼を停止させる制御が
とられるように構成されているのである。That is, when the mixed gas is not ignited or extinguished, or when an abnormal situation occurs in the electric system regardless of whether the mixed gas is normally burned, the supply of the hydrogen gas is stopped. Thus, the control for stopping the combustion of the mixed gas is performed.
尚、上記の異常事態が発生したときに、前記水素ガス用
電磁弁Ｖ２を閉じさせるだけでなく、サンプルガス用な
らびに助燃ガス用の電磁弁Ｖ１，Ｖ３も閉じさせるよう
に構成するも良い。もっとも、前記助燃ガスとして空気
を用いる場合は、前記排気ガスライン12に残留の水素ガ
スやサンプルガスを該空気の供給により希釈排気させ得
るので、当該助燃ガスの供給を停止させる必要性はな
い。In addition, when the above-mentioned abnormal situation occurs, not only the solenoid valve V 2 for hydrogen gas is closed, but also the solenoid valves V 1 and V 3 for sample gas and auxiliary gas are closed. good. However, when air is used as the auxiliary combustion gas, it is not necessary to stop the supply of the auxiliary combustion gas because residual hydrogen gas or sample gas can be diluted and exhausted to the exhaust gas line 12 by supplying the air.
以上説明したように本考案によるＦＩＤ分析計は、混合
ガスが未着火であったり、燃焼中の炎が消えるなどして
電流測定回路に電流が流れなかったり、あるいは、コレ
クタ電極と高電圧電極との間に絶縁不良が生ずるなどし
て電流測定回路に過大な電流が流れたりして、電流測定
回路に出力される電流値が基準電流値の下限または上限
を外れたときに、自己の測定信号の状態からその異常を
検出して、水素ガスの供給を自動的に停止させるもので
ある。As described above, in the FID analyzer according to the present invention, the mixed gas is not ignited, the flame during burning is extinguished, and the current does not flow in the current measuring circuit, or the collector electrode and the high-voltage electrode are connected. If an excessive current flows in the current measurement circuit due to insulation failure, etc., and the current value output to the current measurement circuit deviates from the lower or upper limit of the reference current value, the self-measurement signal The abnormality is detected from the state of, and the supply of hydrogen gas is automatically stopped.
従って、混合ガスの未着火時や消炎時、あるいは、前記
両電極間での絶縁不良が生じたときに、燃料用の水素ガ
スを含む未燃焼の混合ガスそのまま系外に放散させると
いう極めて危険な状態を確実に回避することができ、こ
の種のＦＩＤ分析計の安全性を大いに向上させることが
できるようになった。Therefore, when the mixed gas is not ignited or extinguished, or when insulation failure between the electrodes occurs, it is extremely dangerous to diffuse the unburned mixed gas containing hydrogen gas for fuel as it is to the outside of the system. The situation can be reliably avoided, and the safety of this kind of FID analyzer can be greatly improved.
第１図は本考案に係るＦＩＤ分析計の一構成例を示す図
である。 ３…電流測定回路、４…コレクタ電極、７…高電圧電
極、16…比較手段、17…供給停止手段。FIG. 1 is a diagram showing a configuration example of an FID analyzer according to the present invention. 3 ... Current measuring circuit, 4 ... Collector electrode, 7 ... High voltage electrode, 16 ... Comparison means, 17 ... Supply stopping means.
フロントページの続き (72)考案者 木原 信隆 京都府京都市南区吉祥院宮の東町２番地 株式会社堀場製作所内 (56)参考文献 特開 昭51−151594（ＪＰ，Ａ) 実開 昭52−93586（ＪＰ，Ｕ) 実開 昭58−103367（ＪＰ，Ｕ)Front page continuation (72) Nobutaka Kihara Nobutaka Kihara 2 Higashi-cho, Kichijoin-miya, Minami-ku, Kyoto-shi, Kyoto (56) References JP-A-51-151594 (JP, A) (JP, U) Actually open Sho 58-103367 (JP, U)
Claims (1)
焼域近傍に高電圧電極とコレクタ電極を設けると共に、
前記混合ガスの燃焼によって上記両電極間に生じるイオ
ン化電流を測定する電流測定回路を前記コレクタ電極に
接続して成るＦＩＤ分析計において、前記混合ガスが正
常に燃焼しているときのイオン化電流の上下限の電流値
を基準電流値として、該基準電流値と前記電流測定回路
に出力される電流値とを比較する比較手段を設けると共
に、前記出力電流値が前記基準電流値の下限または上限
を外れたことの比較結果を基にして前記水素ガスの供給
を停止させる手段を設けて成るＦＩＤ分析計。1. A high voltage electrode and a collector electrode are provided in the vicinity of a combustion region of a mixed gas of hydrogen gas and sample gas, and
In an FID analyzer having a current measuring circuit connected to the collector electrode for measuring an ionization current generated between the electrodes due to the combustion of the mixed gas, the ionization current when the mixed gas is normally burning With the lower limit current value as the reference current value, a comparison means is provided for comparing the reference current value with the current value output to the current measuring circuit, and the output current value is out of the lower limit or the upper limit of the reference current value. An FID analyzer comprising means for stopping the supply of the hydrogen gas based on the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987196352U JPH065622Y2 (en) | 1987-12-23 | 1987-12-23 | FID analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987196352U JPH065622Y2 (en) | 1987-12-23 | 1987-12-23 | FID analyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0199060U JPH0199060U (en) | 1989-07-03 |
| JPH065622Y2 true JPH065622Y2 (en) | 1994-02-09 |
Family
ID=31486974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987196352U Expired - Lifetime JPH065622Y2 (en) | 1987-12-23 | 1987-12-23 | FID analyzer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH065622Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51151594A (en) * | 1975-06-20 | 1976-12-27 | Sony Corp | Protective circuit for flame detection circuit |
| JPS5293586U (en) * | 1976-01-09 | 1977-07-13 |
-
1987
- 1987-12-23 JP JP1987196352U patent/JPH065622Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0199060U (en) | 1989-07-03 |
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