JPH0886877A - Dust radiation monitor dust collection control method and apparatus and dust sampler - Google Patents
Dust radiation monitor dust collection control method and apparatus and dust samplerInfo
- Publication number
- JPH0886877A JPH0886877A JP6223597A JP22359794A JPH0886877A JP H0886877 A JPH0886877 A JP H0886877A JP 6223597 A JP6223597 A JP 6223597A JP 22359794 A JP22359794 A JP 22359794A JP H0886877 A JPH0886877 A JP H0886877A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- filter
- dust
- air
- pipe
- Prior art date
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- Sampling And Sample Adjustment (AREA)
Abstract
(57)【要約】
【目的】 サンプリング空気中の粒子の配管沈着率を増
加させずに常に精度良く放射能濃度を測定する。
【構成】 サンプリング空気の通路２の途中に設けた流
量検出器５は、空気流量に応じた信号を出力し、流量制
御部１１に供給する。流量制御部１１は、流量検出器５
の検出信号が、配管沈着率最小値を与える流量設定値に
一致するように流量調節弁４の弁開度を制御する。フィ
ルタ入替制御部１２は、調節弁４の弁開度が、フィルタ
の目詰まりによる流量制御限界を表すフィルタ入替用設
定値より大きくなったとき、フィルタ１３を所定長さの
未使用部分に入れ替える。
(57) [Summary] [Purpose] The radioactivity concentration is always measured accurately without increasing the pipe deposition rate of particles in the sampling air. [Structure] A flow rate detector 5 provided in the middle of the sampling air passage 2 outputs a signal according to the air flow rate and supplies the signal to the flow rate control unit 11. The flow rate control unit 11 uses the flow rate detector 5
The control signal controls the valve opening degree of the flow rate control valve 4 so that the detection signal of (1) matches the flow rate setting value that gives the minimum value of the pipe deposition rate. The filter replacement control unit 12 replaces the filter 13 with an unused portion having a predetermined length when the valve opening degree of the control valve 4 becomes larger than a filter replacement set value representing a flow rate control limit due to clogging of the filter.
Description
【０００１】[0001]
【産業上の利用分野】本発明は原子力発電所や放射線取
扱施設等の建屋内の空気中に含まれる粒子を捕集して粒
子の放射線レベル及び空気単位体積あたりの放射能等を
監視するダスト放射線モニタに係り、特に、高精度の放
射能モニタを行うのに好適な集塵制御方法及びその装置
とダストサンプラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a dust for collecting particles contained in the air inside a building such as a nuclear power plant or a radiation handling facility and monitoring the radiation level of the particles and the radioactivity per unit volume of air. The present invention relates to a radiation monitor, and more particularly to a dust collection control method, a device therefor, and a dust sampler suitable for performing highly accurate radioactivity monitoring.
【０００２】[0002]
【従来の技術】原子力発電所や放射線取扱施設等では、
建屋内に居る人間の安全確保のために、建屋内の空気中
に含む粒子を捕集し、粒子の放射性帯有の有無及び空気
単位体積あたりの放射能等を監視するダスト放射線モニ
タが設置されている。2. Description of the Related Art Nuclear power plants, radiation handling facilities, etc.
In order to ensure the safety of people in the building, a dust radiation monitor is installed to collect particles contained in the air inside the building and monitor the presence or absence of radioactive bands of particles and the radioactivity per unit volume of air. ing.
【０００３】ダスト放射線モニタに設けられているダス
トサンプラは、モニタ対象箇所の空気を吸引ポンプで吸
入し、吸入通路中に設けた集塵部で空気中の粒子を捕集
するようになっている。集塵部には、空気中の粒子のみ
を捕集するろ紙等のフィルタが設けられている。フィル
タは捕集時間の経過により目詰りが進行し、サンプリン
グ動作を妨げる。このため、フィルタとして長尺のろ紙
を巻いたものを使用し、フィルタの目詰り状態が設定値
以上になったときにろ紙を繰り出させて新たなろ紙に入
れ替えるようにしている。このろ紙の入れ替え制御を間
違えると、フィルタが完全に目詰まりして吸引ポンプが
過負荷となってトリップしてしまい、放射線の測定がで
きない欠測期間が生じてしまい、好ましくない。A dust sampler provided in a dust radiation monitor is designed to suck air at a monitored portion with a suction pump and collect particles in the air with a dust collecting portion provided in the suction passage. . The dust collecting unit is provided with a filter such as a filter paper that collects only particles in the air. The filter becomes clogged with the elapse of the collection time, which hinders the sampling operation. For this reason, a long filter paper is used as the filter, and when the clogging condition of the filter exceeds a set value, the filter paper is fed out and replaced with a new filter paper. If the filter paper replacement control is mistaken, the filter will be completely clogged, the suction pump will be overloaded, and tripping will occur, resulting in a missing period during which radiation measurement cannot be performed, which is not preferable.
【０００４】そこで、従来のダストサンプラは、特公平
５−８０９９３号公報に記載されている様に、フィルタ
下流側の吸入空気流量または圧力を検出し、検出値がフ
ィルタ入替設定値以下に低下したとき、フィルタの目詰
まりが進んでいると判断してフィルタ入替を自動的に行
う様にしている。Therefore, as described in Japanese Patent Publication No. 5-80993, the conventional dust sampler detects the intake air flow rate or pressure on the downstream side of the filter, and the detected value falls below the filter replacement set value. At this time, it is determined that the filter is clogged, and the filter is automatically replaced.
【０００５】[0005]
【発明が解決しようとする課題】モニタ対象箇所の空気
を配管を通して吸入する場合、空気中の粒子は、フィル
タに捕集されるまでの間に、その一部が配管内壁に付着
する。この付着する率は配管沈着率と呼称される。When the air at the monitored location is sucked in through the pipe, some of the particles in the air adhere to the inner wall of the pipe before being collected by the filter. This adhesion rate is called the pipe deposition rate.
【０００６】前記従来技術は、空気サンプリング時間の
経過に伴うフィルタの目詰り状態の進行を空気流量の低
下あるいはポンプ吸引側圧力の低下により監視している
が、フィルタ入替設定値を、完全な目詰りに達する直前
の粒子捕集に十分可能な目詰り状態を表す指標とし、フ
ィルタ入替えを行うまで空気流量の低下，ポンプ吸引側
圧力の低下を許容している。このため、フィルタ目詰り
が進行してポンプ吸引側圧力が低下しサンプリング流量
が低下してくると、粒子の配管沈着率が増加してフィル
タが捕集する粒子の割合が減少し、放射能濃度測定値の
誤差を増加させてしまうという問題がある。In the above-mentioned prior art, the progress of the clogging state of the filter with the lapse of the air sampling time is monitored by the decrease of the air flow rate or the decrease of the pressure on the suction side of the pump. It is used as an index indicating the clogging state that is sufficient to collect particles immediately before reaching clogging, and allows reduction of the air flow rate and reduction of the pump suction side pressure until the filter is replaced. For this reason, when the filter clogging progresses and the pump suction side pressure decreases and the sampling flow rate decreases, the pipe deposition rate of particles increases and the ratio of particles captured by the filter decreases, resulting in a decrease in radioactivity concentration. There is a problem that the error of the measured value is increased.
【０００７】本発明の目的は、フィルタの目詰まり状態
に無関係に常に高精度な放射能濃度測定を可能とし、し
かも、完全な目詰まりによるポンプの過負荷トリップを
防止して欠測状態を回避しながら円滑にサンプリング動
作を行うダスト放射線モニタの集塵制御方法及びその装
置とダストサンプラを提供することにある。An object of the present invention is to enable highly accurate radioactivity concentration measurement regardless of the clogging state of the filter, and prevent overload trip of the pump due to complete clogging to avoid a missing state. However, it is another object of the present invention to provide a dust collection control method for a dust radiation monitor, a device therefor, and a dust sampler that perform a smooth sampling operation.
【０００８】[0008]
【課題を解決するための手段】上記目的は、吸引ポンプ
により配管を通して吸入した空気中の粒子を配管途中に
設けたフィルタで捕集し該粒子の放射線濃度をモニタす
るダスト放射線モニタにおいて、前記配管に流れる空気
流量を、前記粒子が該配管内壁に付着する配管沈着率を
最小とする流量値に定値制御することで、達成される。The above object is to provide a dust radiation monitor which collects particles in the air sucked through a pipe by a suction pump with a filter provided in the middle of the pipe and monitors the radiation concentration of the particles. It is achieved by controlling the flow rate of the air flowing through the pipe to a flow rate value that minimizes the deposition rate of the pipe on which the particles adhere to the inner wall of the pipe.
【０００９】[0009]
【作用】粒子の配管沈着率は、空気流量がある値のとき
に最小値を示す。そこで、本発明では、配管内の空気流
量を常に配管沈着率最小となる流量に定値制御すること
で、モニタする粒子をフィルタに捕集させる率を減少さ
せないことができる。The pipe deposition rate of particles shows the minimum value when the air flow rate is a certain value. Therefore, in the present invention, the rate at which the particles to be monitored are collected by the filter can be prevented from decreasing by constantly controlling the air flow rate in the pipe to a flow rate that minimizes the pipe deposition rate.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。図１は、本発明の一実施例に係るダスト放射線
モニタのダストサンプラの構成図である。サンプリング
する空気は、吸引ポンプ１により、測定対象の場所Ａか
ら吸入して場所Ｂに排気する。このサンプリング空気の
経路２の途中に集塵部３を設け、集塵部３にろ紙等のフ
ィルタ１３を設け、サンプリング空気中の粒子を捕集す
る。集塵部３の下流側には、流量調節弁４及び流量検出
器５を設置してある。流量検出器５は、空気吸入経路２
内の流量に応じた流量検出信号を出力し、この流量検出
信号を流量制御部１１に送る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a dust sampler of a dust radiation monitor according to an embodiment of the present invention. The air to be sampled is sucked from the place A to be measured and exhausted to the place B by the suction pump 1. A dust collecting part 3 is provided in the middle of the path 2 of the sampling air, and a filter 13 such as filter paper is provided in the dust collecting part 3 to collect particles in the sampling air. A flow rate control valve 4 and a flow rate detector 5 are installed on the downstream side of the dust collector 3. The flow rate detector 5 has an air intake path 2
A flow rate detection signal corresponding to the flow rate inside is output, and this flow rate detection signal is sent to the flow rate control unit 11.
【００１１】流量制御部１１は、流量検出器５から送ら
れてくる流量検出信号が、予め設定された流量設定値に
一致するように流量調節弁４へ操作信号を与え、サンプ
リング空気が常に一定流量値（＝流量設定値）となるよ
うに定値制御を行う。また、この流量制御部１１は、フ
ィルタ入替制御部１２にもこの操作信号を与える。The flow rate control unit 11 gives an operation signal to the flow rate control valve 4 so that the flow rate detection signal sent from the flow rate detector 5 matches a preset flow rate setting value, and the sampling air is always constant. Constant value control is performed so that the flow rate value (= flow rate setting value) is obtained. The flow rate control unit 11 also gives the operation signal to the filter replacement control unit 12.
【００１２】フィルタ入替制御部１２は、フィルタの目
詰まりによる流量制御限界を表すフィルタ入替用設定値
が予め設定されており、流量制御部１１からの流量調節
弁操作信号をフィルタ入替用設定値と比較し、フィルタ
入替用設定値を越えたときにフィルタ巻取部１４にフィ
ルタ入替駆動信号を出力する。この駆動信号により、フ
ィルタ巻取部１４はフィルタ１３の巻取動作を行い、フ
ィルタ供給部１５から所定長さの未使用部分を送り出さ
せ、集塵部３に設定する。The filter replacement control unit 12 is preset with a filter replacement set value representing the flow control limit due to filter clogging, and the flow control valve operation signal from the flow controller 11 is used as the filter replacement set value. The comparison is made, and when the set value for filter replacement is exceeded, a filter replacement drive signal is output to the filter winding section 14. By this drive signal, the filter winding unit 14 performs the winding operation of the filter 13, the unused portion of a predetermined length is sent out from the filter supply unit 15, and is set in the dust collecting unit 3.
【００１３】図２は、流量と流量調節弁の操作信号との
関係を表すグラフである。サンプリング初期時の流量と
流量調節弁の操作信号との関係は、図中Ｐ１の関係とな
っており、流量設定値Ｆｓに対する初期の操作信号は、
開方向に十分余裕を持った操作信号Ｄ１である。フィル
タの目詰りが進行して、図中Ｐ２，Ｐ３の如くポンプ吸
引側圧力が低下してくると、弁操作信号は図中Ｄ２，Ｄ
３の如く順次開方向に上昇していき、やがて流量設定値
Ｆｓを保とうとするために弁操作信号が図中の最大値Ｄ
maxに到達する。つまり、Ｄmaxが流量設定値Ｆｓにおけ
る流量制御限界であり、フィルタ入替用設定値を弁操作
信号がＤmaxに到達する直前の図中Ｄｓに設定し、弁操
作信号がフィルタ入替用設定値Ｄｓを越えたときにフィ
ルタ入替が必要と判定できる。FIG. 2 is a graph showing the relationship between the flow rate and the operation signal of the flow rate control valve. The relationship between the flow rate at the beginning of sampling and the operation signal of the flow rate control valve is P1 in the figure, and the initial operation signal for the flow rate set value Fs is
The operation signal D1 has a sufficient margin in the opening direction. When the filter clogging progresses and the pump suction side pressure decreases as indicated by P2 and P3 in the figure, the valve operation signal changes to D2 and D in the figure.
As shown in Fig. 3, the valve operation signal gradually increases in the opening direction, and eventually the valve operation signal is set to the maximum value D in order to maintain the flow rate setting value Fs.
reach max. That is, Dmax is the flow rate control limit at the flow rate set value Fs, the filter replacement set value is set to Ds in the figure immediately before the valve operation signal reaches Dmax, and the valve operation signal exceeds the filter replacement set value Ds. It can be determined that the filter needs to be replaced when
【００１４】図３は、流量制御部１１の制御ブロック図
である。減算器３１にて流量設定値Ｆｓとフィ−ドバッ
クの流量検出信号との差分をとった後、ＰＩ制御器３２
にてＰＩ制御することによって、流量調節弁へ操作信号
を供給して流量制御する。FIG. 3 is a control block diagram of the flow controller 11. After subtracting the flow rate set value Fs and the feedback flow rate detection signal by the subtracter 31, the PI controller 32
The PI control is performed to supply an operation signal to the flow rate control valve to control the flow rate.
【００１５】図４は、配管内を流れる空気の流速と粒子
の配管沈着率との関係を示すグラフである。図４に示す
様に、一般に所定の流速値Ｖ０の所で配管沈着率は最小
値となり、Ｖ０を中心に流速が高速側あるいは低速側に
変化すると、配管沈着率は増加する。また、流速は流量
と比例関係を持つ。ダスト放射線モニタは、放射能濃度
と呼称される空気単位体積当たりの粒子に含まれる放射
能を監視するため、配管沈着率が最小となる流速に対応
する流量をサンプリング流量として設定する必要があ
る。そこで、本実施例では、この流速Ｖ０を、前記図２
に示す設定値Ｆｓとする。これにより、サンプリング流
量は、常に、配管沈着率最小となる流量に定値制御され
る。FIG. 4 is a graph showing the relationship between the flow velocity of air flowing in the pipe and the pipe deposition rate of particles. As shown in FIG. 4, generally, the pipe deposition rate becomes the minimum value at a predetermined flow velocity value V0, and when the flow velocity changes to the high speed side or the low speed side around V0, the pipe deposition rate increases. Further, the flow velocity has a proportional relationship with the flow rate. Since the dust radiation monitor monitors the radioactivity contained in particles per unit volume of air, which is called the radioactivity concentration, it is necessary to set the flow rate corresponding to the flow rate at which the pipe deposition rate is the minimum as the sampling flow rate. Therefore, in this embodiment, the flow velocity V0 is set to the value shown in FIG.
The set value Fs shown in FIG. As a result, the sampling flow rate is constantly controlled to a flow rate that minimizes the pipe deposition rate.
【００１６】尚、本実施例では、流量制御部１１と流量
検出器５を個別に設けたか、その代りに、流量調節弁４
に両者の機能を持つような構成にしてもよいことはいう
までもない。また、フィルタ入替制御部は、調節弁４の
操作信号を監視してフィルタ１３の入替えを行ったが、
調節弁４の弁開度を監視してもフィルタ１３の入替えを
行う構成としてもよい。In this embodiment, the flow rate control unit 11 and the flow rate detector 5 are separately provided, or instead, the flow rate control valve 4 is used.
Needless to say, it may be configured to have both functions. Further, the filter replacement control unit monitors the operation signal of the control valve 4 and replaces the filter 13,
The filter 13 may be replaced by monitoring the valve opening of the control valve 4.
【００１７】以上の実施例により、サンプリング時間の
経過に伴うフィルタの目詰りが進行しても空気流量が常
に一定に保たれることにより、粒子の配管沈着率を増加
させずに適正な放射能濃度を求めることができる。According to the above embodiment, the air flow rate is always kept constant even if the filter is clogged with the elapse of the sampling time, so that the proper radioactivity can be obtained without increasing the pipe deposition rate of particles. The concentration can be determined.
【００１８】[0018]
【発明の効果】本発明によれば、フィルタの完全な目詰
まりによるポンプの過負荷トリップを防止し不要な欠測
状態を極回避しながら円滑にサンプリング動作を行いつ
つ、粒子の配管沈着率を増加させずに適正な放射能濃度
を測定でき、人間の安全確保の観点において向上が期待
できる。According to the present invention, the overload trip of the pump due to the complete clogging of the filter is prevented, and the sampling operation is smoothly performed while avoiding an unnecessary missing state, and the pipe deposition rate of particles is reduced. An appropriate radioactivity concentration can be measured without increasing it, and improvement can be expected from the viewpoint of ensuring human safety.
【図１】本発明の一実施例に係るダスト放射線モニタの
ダストサンプラ構成図である。FIG. 1 is a configuration diagram of a dust sampler of a dust radiation monitor according to an embodiment of the present invention.
【図２】流量と流量調節弁の操作信号の関係を表すグラ
フである。FIG. 2 is a graph showing a relationship between a flow rate and an operation signal of a flow rate control valve.
【図３】図１に示す流量制御部の一例を表す図である。FIG. 3 is a diagram illustrating an example of a flow rate control unit illustrated in FIG.
【図４】配管内を流れる空気の流速と粒子の配管沈着率
との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the flow velocity of air flowing in the pipe and the pipe deposition rate of particles.
１…吸引ポンプ，２…空気吸入経路，３…集塵部，４…
流量調節弁，５…流量検出器，１１…流量制御部，１２
…フィルタ入替制御部，１３…粒子捕集フィルタ，１４
…フィルタ巻取り部，１５…フィルタ供給部，３１…減
算器，３２…ＰＩ制御部。1 ... Suction pump, 2 ... Air suction path, 3 ... Dust collector, 4 ...
Flow rate control valve, 5 ... Flow rate detector, 11 ... Flow rate control unit, 12
... Filter replacement control unit, 13 ... Particle collection filter, 14
... filter winding unit, 15 ... filter supply unit, 31 ... subtractor, 32 ... PI control unit.
フロントページの続き (72)発明者 高橋 一悦 茨城県日立市大みか町五丁目２番１号 株 式会社日立製作所大みか工場内 (72)発明者 石村 健治 茨城県日立市幸町三丁目２番１号 日立エ ンジニアリング株式会社内Front page continuation (72) Inventor Ichietsu Takahashi 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika Plant, Ltd. (72) Kenji Ishimura 3-2-1, Saiwai-cho, Hitachi, Ibaraki No. within Hitachi Engineering Co., Ltd.
Claims (12)
空気中の粒子を配管途中に設けたフィルタで捕集し該粒
子の放射線濃度をモニタするダスト放射線モニタの集塵
制御方法において、前記配管に流れる空気流量を、前記
粒子が該配管内壁に付着する配管沈着率を最小とする流
量値に定値制御することを特徴とする集塵制御方法。1. A dust collection control method for a dust radiation monitor, wherein particles in the air sucked through a pipe by a suction pump are collected by a filter provided in the middle of the pipe to monitor the radiation concentration of the particles. A dust collection control method, wherein the flow rate is controlled to a fixed value such that the deposition rate of the particles adhering to the inner wall of the pipe is minimized.
前記配管途中に設けた空気調節弁の弁開度を制御するこ
とで行うことを特徴とする集塵制御方法。2. The control of the air flow rate according to claim 1,
A dust collection control method, which is performed by controlling a valve opening of an air control valve provided in the middle of the pipe.
調節弁の制御が限界に達し前記定値制御ができなくなる
とき前記フィルタを新しいフィルタに入れ替えることを
特徴とする集塵制御方法。3. The dust collection control method according to claim 1, wherein the filter is replaced with a new filter when the control of the air regulating valve reaches a limit and the constant value control cannot be performed.
空気中の粒子を配管途中に設けたフィルタで捕集し該粒
子の放射線濃度をモニタするダスト放射線モニタに取り
付けられる集塵制御装置において、前記配管に流れる空
気流量を検出する流量検出手段と、前記粒子が該配管内
壁に付着する配管沈着率を最小とする流量値に前記流量
検出手段の検出流量を定値制御する制御手段とを備える
ことを特徴とする集塵制御装置。4. A dust collection control device attached to a dust radiation monitor for collecting particles in the air sucked through a pipe by a suction pump with a filter provided in the middle of the pipe to monitor the radiation concentration of the particles, wherein A flow rate detecting means for detecting a flow rate of the flowing air; and a control means for controlling the flow rate detected by the flow rate detecting means to a constant value to a flow rate value that minimizes a pipe deposition rate where the particles adhere to the inner wall of the pipe. Dust collection control device.
気流量の制御を行うために前記配管途中に空気調節弁を
備え、該空気調節弁の弁開度を制御することことを特徴
とする集塵制御装置。5. The control device according to claim 4, wherein the control means includes an air control valve in the middle of the pipe for controlling an air flow rate, and controls a valve opening degree of the air control valve. Dust collection control device.
調節弁の制御が限界に達し前記定値制御ができなくなる
とき前記フィルタを新しいフィルタに入れ替えるフィル
タ入替手段を備えることを特徴とする集塵制御装置。6. The dust collection control according to claim 4 or 5, further comprising a filter replacement means for replacing the filter with a new filter when the control of the air regulating valve reaches a limit and the constant value control cannot be performed. apparatus.
吸引ポンプと、該吸引ポンプで吸入する空気の通路とな
る配管と、該配管途中に設けられた集塵部と、該集塵部
に自動入替可能に配置されたフィルタとを備えるダスト
放射線モニタのダストサンプラにおいて、前記配管に流
れる空気流量を検出する流量検出手段と、前記粒子が該
配管内壁に付着する配管沈着率を最小とする流量値に前
記流量検出手段の検出流量を定値制御する制御手段とを
備えることを特徴とするダストサンプラ。7. A suction pump for sucking air in a radiation monitoring target portion, a pipe serving as a passage for air sucked by the suction pump, a dust collecting portion provided in the middle of the pipe, and an automatic dust collecting portion. In a dust sampler of a dust radiation monitor provided with a filter that can be replaced, a flow rate detecting means for detecting an air flow rate flowing in the pipe, and a flow rate value that minimizes a pipe deposition rate in which the particles adhere to the inner wall of the pipe. And a control means for controlling the flow rate detected by the flow rate detection means to a constant value.
気流量の制御を行うために前記配管途中に空気調節弁を
備え、該空気調節弁の弁開度を制御することことを特徴
とするダストサンプラ。8. The control means according to claim 7, wherein the control means includes an air control valve in the middle of the pipe for controlling an air flow rate, and controls a valve opening degree of the air control valve. Dust sampler.
調節弁の制御が限界に達し前記定値制御ができなくなる
とき前記フィルタを新しいフィルタに入れ替えるフィル
タ入替手段を備えることを特徴とするダストサンプラ。9. The dust sampler according to claim 7 or 8, further comprising a filter replacement means for replacing the filter with a new filter when the control of the air regulating valve reaches a limit and the constant value control cannot be performed.
た空気中の粒子を配管途中に設けたフィルタで捕集し該
粒子の放射線濃度をモニタするダスト放射線モニタにお
いて、請求項７乃至請求項９のいずれかに記載のダスト
サンプラを備えることを特徴とするダスト放射線モニ
タ。10. A dust radiation monitor for monitoring the radiation concentration of particles by collecting particles in the air sucked through a pipe by a suction pump with a filter provided in the middle of the pipe, according to any one of claims 7 to 9. A dust radiation monitor, comprising: the dust sampler according to 1.
と、吸入される前記サンプリング空気の経路の途中に設
けられ粒子捕集フィルタを備える集塵部と、捕集した粒
子の放射線を検出する手段とを備えるダスト放射線モニ
タにおいて、前記粒子捕集フィルタの下流側に位置して
前記経路内のサンプリング空気の流量を検出する流量検
出手段と、該経路内に設けられ該経路内のサンプリング
空気流量を調整する流量調節弁と、前記流量検出手段の
検出値が予め定められた設定値となるように前記流量調
節弁の弁開度を制御する流量制御手段と、前記粒子捕集
フィルタが完全な目詰り状態に達する前の状態であって
空気中に含まれる粒子の捕集が十分に可能な目詰り状態
を表す指標となるフィルタ入替用設定値が設定され前記
流量調節弁の弁開度操作信号が該フィルタ入替用設定値
を越えたときに前記粒子捕集フィルタを未使用部分のフ
ィルタと入れ替えるフィルタ入替制御手段とを備えるこ
とを特徴とするダスト放射線モニタ。11. A pump for sucking in sampling air, a dust collecting section provided in the middle of the path of the sucked sampling air and having a particle trapping filter, and means for detecting radiation of trapped particles. In the dust radiation monitor, a flow rate detecting means located downstream of the particle collecting filter for detecting the flow rate of the sampling air in the path, and a flow rate provided in the path for adjusting the flow rate of the sampling air in the path. The control valve, the flow rate control means for controlling the valve opening of the flow rate control valve so that the detection value of the flow rate detection means becomes a predetermined set value, and the particle collection filter is in a completely clogged state. The filter opening set value is set to a filter replacement set value that is an index indicating a clogging state in which particles contained in the air can be sufficiently collected before reaching the state. A dust radiation monitor, comprising: a filter replacement control means for replacing the particle collection filter with an unused portion of the filter when the production signal exceeds the filter replacement set value.
られた設定値は、前記経路の粒子が付着する率を表す配
管沈着率が最小となる流量値であることを特徴とするダ
スト放射線モニタ。12. The dust radiation monitor according to claim 11, wherein the predetermined set value is a flow rate value that minimizes a pipe deposition rate representing a rate of particles adhering to the path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6223597A JPH0886877A (en) | 1994-09-19 | 1994-09-19 | Dust radiation monitor dust collection control method and apparatus and dust sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6223597A JPH0886877A (en) | 1994-09-19 | 1994-09-19 | Dust radiation monitor dust collection control method and apparatus and dust sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0886877A true JPH0886877A (en) | 1996-04-02 |
Family
ID=16800676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6223597A Pending JPH0886877A (en) | 1994-09-19 | 1994-09-19 | Dust radiation monitor dust collection control method and apparatus and dust sampler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0886877A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264788A (en) * | 1998-03-17 | 1999-09-28 | Horiba Ltd | Diluted gas flow rate control device |
| CN103674622A (en) * | 2013-12-12 | 2014-03-26 | 中广核工程有限公司 | Cumulative corrosion product sampling device |
| JP2017532538A (en) * | 2014-08-28 | 2017-11-02 | ベルテック アソシエイツ インコーポレイテッドＶｅｌｔｅｋ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃ． | Programmable logic controller based system and user interface for sampling air in a controlled environment |
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| US11454573B2 (en) | 2008-02-07 | 2022-09-27 | Veltek Associates, Inc. | Air sampling system |
| US11808674B2 (en) | 2008-02-07 | 2023-11-07 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
-
1994
- 1994-09-19 JP JP6223597A patent/JPH0886877A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264788A (en) * | 1998-03-17 | 1999-09-28 | Horiba Ltd | Diluted gas flow rate control device |
| US11454573B2 (en) | 2008-02-07 | 2022-09-27 | Veltek Associates, Inc. | Air sampling system |
| US12306080B2 (en) | 2008-02-07 | 2025-05-20 | Veltek Associates, Inc. | Flow control modules that transmit desired flow rate |
| US11808674B2 (en) | 2008-02-07 | 2023-11-07 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
| CN103674622A (en) * | 2013-12-12 | 2014-03-26 | 中广核工程有限公司 | Cumulative corrosion product sampling device |
| CN103674622B (en) * | 2013-12-12 | 2015-09-09 | 中广核工程有限公司 | Cumulative corrosion product sampling device |
| JP2017532538A (en) * | 2014-08-28 | 2017-11-02 | ベルテック アソシエイツ インコーポレイテッドＶｅｌｔｅｋ Ａｓｓｏｃｉａｔｅｓ， Ｉｎｃ． | Programmable logic controller based system and user interface for sampling air in a controlled environment |
| JP2022071116A (en) * | 2014-08-28 | 2022-05-13 | ベルテック アソシエイツ インコーポレイテッド | System and user interface based on programmable logic controller for sampling air in controlled environment |
| JP2021181993A (en) * | 2014-08-28 | 2021-11-25 | ベルテック アソシエイツ インコーポレイテッドVeltek Associates, Inc. | System and user interface based on programmable logic controller for sampling air in a controlled environment |
| US11971396B2 (en) | 2014-08-28 | 2024-04-30 | Veltek Associates, Inc. | Programmable logic controller-based system and user interface for air sampling controlled environments |
| US12422420B2 (en) | 2014-08-28 | 2025-09-23 | Veltek Associates, Inc. | Programmable logic controller-based system and user interface for air sampling in controlled environments |
| CN111024571A (en) * | 2019-12-10 | 2020-04-17 | 北京雪迪龙科技股份有限公司 | Sampling flow control system for particulate matter monitor, particulate matter monitor, method and device for controlling gas flow |
| CN112619306A (en) * | 2020-12-18 | 2021-04-09 | 徐州晶睿半导体装备科技有限公司 | Dust removal and filtration system of single crystal furnace, control method of dust removal and filtration system and single crystal furnace assembly |
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