JPH0236314A - Liquid level detecting device - Google Patents
Liquid level detecting deviceInfo
- Publication number
- JPH0236314A JPH0236314A JP63185529A JP18552988A JPH0236314A JP H0236314 A JPH0236314 A JP H0236314A JP 63185529 A JP63185529 A JP 63185529A JP 18552988 A JP18552988 A JP 18552988A JP H0236314 A JPH0236314 A JP H0236314A
- Authority
- JP
- Japan
- Prior art keywords
- liquid level
- liquid
- signal
- circuit
- level detection
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 128
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 239000000523 sample Substances 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000012864 cross contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 210000002966 serum Anatomy 0.000 description 2
- 241001385733 Aesculus indica Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、血清などの液体試料に試薬を加えて反応させ
、自動的に吸光度を測定し、さらに吸光度により農度を
算出、表示する臨床化学や生化学分野における自動分析
装置などに適用される液面検知装置に関するものである
。Detailed Description of the Invention (Industrial Application Field) The present invention is a clinical application that adds a reagent to a liquid sample such as serum, reacts it, automatically measures the absorbance, and further calculates and displays the agricultural grade based on the absorbance. This invention relates to a liquid level detection device that is applied to automatic analyzers in the fields of chemistry and biochemistry.
（従来の技術）
従来、この種の検知装置としては、例えば、検出対象の
液体を収容した収納容器に対して、上方から定速度で上
下方向に往復駆動されかつ液面センサーを併設した分圧
プローブと、この分注プローブが蒸発防止蓋体および液
面に接触する際、該液面センサの信号変化を基にして収
納容器内の液量を算出し、その結果を表示する演算制御
手段を有する液量検知装置があり（特開昭６ｉ １９４
４６４号）、また、試薬液貯留部の試薬液の液面を検知
する２本ノズルからなる液面検知器と、該検知器の出力
により試薬液の残量を表示する試薬残量表示装置より構
成したもの （特開昭５７−８２７６９号）があり、さ
らに誘電容量を利用した液面検知装置（特開昭６２−２
１８８１８号）や、誘電容量を利用してトレイのカップ
と接触する誘電体を形成した液面検知装置（特開昭６２
−２８９７６９号）が開示されている。(Prior Art) Conventionally, this type of detection device has, for example, a partial pressure sensor that is driven reciprocally in the vertical direction at a constant speed from above with respect to a storage container containing a liquid to be detected, and is also equipped with a liquid level sensor. a probe; and an arithmetic control means that calculates the amount of liquid in the storage container based on a signal change of the liquid level sensor when the dispensing probe contacts the evaporation prevention lid and the liquid surface, and displays the result. There is a liquid level detection device with
No. 464), and a liquid level detector consisting of two nozzles that detects the liquid level of the reagent liquid in the reagent liquid storage part, and a reagent remaining amount display device that displays the remaining amount of the reagent liquid based on the output of the detector. (Japanese Patent Laid-open No. 57-82769), and a liquid level detection device using dielectric capacitance (Japanese Patent Laid-open No. 62-2
No. 18818), and a liquid level detection device that uses dielectric capacitance to form a dielectric that contacts the cup of the tray (Japanese Patent Laid-Open No. 62
-289769) is disclosed.
（発明が解決しようとする課題）
しかしながら、２本ノズルを用いた前記液面検知装置は
、２本のノズル間隔を狭くするか、同ノズルが挿入され
る反応管の容積を大きくする必要があって、狭くしすぎ
ると洗浄水などによる液絡が生じて正しい液面検知がで
きなくなるとともに、血清測定時には電気分解現象によ
る電極の腐蝕が起こり、方式的には、蒸留水などの電導
度の小さい液体や非導電性液体は検出不可能であって、
試料吸引のため不必要な副プローブを試料内に浸漬する
ためのクロス・コンタミネーションの増大などの欠点が
ある。(Problem to be Solved by the Invention) However, in the liquid level detection device using two nozzles, it is necessary to narrow the gap between the two nozzles or to increase the volume of the reaction tube into which the nozzles are inserted. If the width is too narrow, liquid junctions will occur due to cleaning water, etc., making it impossible to accurately detect the liquid level. At the same time, electrodes will be corroded due to electrolysis when measuring serum. Liquids and non-conductive liquids are undetectable;
There are drawbacks such as increased cross contamination because an unnecessary sub-probe is immersed into the sample for sample aspiration.
また、特開昭６２−１９４４６４号は、空気と蒸発防止
蓋体、空気と収容容器内の液体の誘電率を利用して収容
容器の液量を算出する液ｍ検出装置にすぎず、特開昭６
２−２１８８１８号は、液面センサを構成する採取プロ
ーブの被検出液面の接触の有無に起因するインピーダン
スの変化を検知手段として具備し、液面センサ部と前記
被検液面間の浮遊容看をその構成要素の一部としたブリ
ッジ回路を汀するしのであるが、本装置は自動分析装置
のトレイがプラスチック製であるため、有効な仮想グラ
ンドがとれず、ブリッジ回路から得る信号か小さすぎ正
確な液面検出ができない。さらに特開昭６２−２８９７
６９号は、トレイのカップと接触する誘電体を形成して
仮想グランドを形成しているが、導電体を使用しなけれ
ばならなずまた合成樹脂製１−トイの場合などでは検出
が困難となるなどの欠点が見暑−れる。In addition, JP-A-62-194464 is nothing more than a liquid m detection device that calculates the amount of liquid in a storage container using air, an evaporation prevention lid, and the dielectric constants of air and liquid in the container. Showa 6
No. 2-218818 is equipped with a detection means that detects a change in impedance caused by the presence or absence of contact between a sampling probe constituting a liquid level sensor and the liquid surface to be detected, and detects a floating volume between the liquid level sensor section and the liquid surface to be detected. However, since the tray of the automatic analyzer is made of plastic, an effective virtual ground cannot be established, and the signal obtained from the bridge circuit may be small. Too accurate liquid level detection. Furthermore, JP-A-62-2897
No. 69 forms a virtual ground by forming a dielectric material that comes into contact with the cup of the tray, but it requires the use of a conductor and is difficult to detect in the case of synthetic resin 1-toys. The shortcomings such as Naru are noticeable.
本発明は、」−記のような課題に対処するために、液面
検知のための新しい検知方式とその回路を構成し、分注
プローブのノズル部を液面検出センサに兼用して一本化
を可能とし、前記課題を解決して検出性能、信頼性を向
丘した液面検知装置を提供するしのである。In order to deal with the problems mentioned above, the present invention configures a new detection method and its circuit for liquid level detection, and uses the nozzle part of the dispensing probe as a liquid level detection sensor. The purpose of the present invention is to provide a liquid level detection device that solves the above problems and improves detection performance and reliability.
（課題を解決するための手段）
本発明は、液体の収容容器の上方に配置されて上下動し
同液体を吸引する分注プローブの、ノズル部自体を、前
記収容容器内の空気と液体の静電容量を検出する液面検
出センサとし、該液面検出センサに連設され前記静電容
量の検出に基づき液面検出信号を出力する液面検知回路
を具備した構成に特徴を何し、前記ノズル部自体の液面
検知センサによる収容容器内の液面との接触の有無に起
因する、静電容量の大きい変化を検出信号と１７て得る
ことにより、液面の適格な検出信号を得て液面検知性能
、信頼性を向上している。(Means for Solving the Problems) The present invention provides a dispensing probe that is disposed above a liquid storage container and moves up and down to aspirate the liquid. A liquid level detection sensor that detects capacitance, and a liquid level detection circuit that is connected to the liquid level detection sensor and outputs a liquid level detection signal based on the detection of the capacitance. A suitable detection signal of the liquid level is obtained by obtaining a large change in capacitance caused by the presence or absence of contact with the liquid level in the storage container by the liquid level detection sensor of the nozzle part itself as a detection signal. This improves liquid level detection performance and reliability.
（作 用）
本発明は、−ｈ ３２のような構成からなり、分注プロ
ーブのノズル部自体で形成された液面検出センサは、収
容容器内の空気と液体の大きい静電容量の差に基づき、
同液体の液面との接触の有無に起因する静電容量の変化
により確実、正確な波形の検出信号を得て、液面検知回
路は同検出信号に基づき演算処理して適格な液面検知信
号を出力し、優れた液面検知性能とともに信頼性が得ら
れる。(Function) The present invention has a configuration as shown in -h32, in which the liquid level detection sensor formed by the nozzle part itself of the dispensing probe detects the large difference in capacitance between the air and liquid in the storage container. Based on
A detection signal with a reliable and accurate waveform is obtained by changes in capacitance caused by the presence or absence of contact with the liquid surface, and the liquid level detection circuit performs arithmetic processing based on the detection signal to detect a suitable liquid level. It outputs a signal and provides excellent liquid level detection performance and reliability.
該液面検出センサは、ノズル部を含む分注プローブ自体
で兼用され一本化されて、クロスコンタミネーションが
最小限におさえられ、そのノズル部の先端部自体が検出
対象液体の液面に接触した時点でその液面を検出するた
め、該検出信号に基づ（検知信号によって分注プローブ
の下降が制御され、ノズルｆ！ＰＪ（３ａ）の先端部の
液面下への浸漬深さが容易に制御され正確に確保される
とともに、ノズル部による液体の吸入量精度、信頼性が
得られる。The liquid level detection sensor is integrated with the dispensing probe itself, including the nozzle part, to minimize cross contamination, and the tip of the nozzle part itself comes into contact with the surface of the liquid to be detected. In order to detect the liquid level at the moment when It is easily controlled and accurately ensured, and the amount of liquid sucked by the nozzle part is accurate and reliable.
（実施例）
以下、本発明の一実施例を第１．２図によって説明ケる
。(Embodiment) An embodiment of the present invention will be explained below with reference to FIG. 1.2.
第１図に示すように、例えば自動化学分析装置のターン
テーブル（２）上に裁置された試料などの検知対象とな
る液体（ａ）を収容１．た収容容器（１）に対して、上
方に配置されて上下動される分注プローブ（３）を備え
ており、分注プローブ（３）は、収容容器（１）内に下
降し液体（ａ）中に浸漬して同液体の一定量を吸引した
のち、上昇、旋回して他の容器（図示省略）内に吐出し
て分注するノズル部（３ａ）を有し、該ノズル部（３ａ
）の上部には、適宜の手段で制御されるポンプ（図示省
略）に連設された吸入、吐出制御用の作動管部（３ｂ）
が一体に連設され、ノズル部（３ａ）および作動管部（
３ｂ）を導電材製として液面検出センサ（３ａ、ｂ）に
構成している。As shown in FIG. 1, a liquid (a) to be detected, such as a sample placed on a turntable (2) of an automatic chemical analyzer, is stored in a 1. A dispensing probe (3) is disposed above and moved up and down with respect to the containing container (1), and the dispensing probe (3) descends into the containing container (1) and dispenses the liquid (a). ), the nozzle part (3a) is immersed in the same liquid to suck a certain amount of the same liquid, and then rises and turns to discharge and dispense into another container (not shown).
), there is an actuating pipe section (3b) for suction and discharge control connected to a pump (not shown) controlled by an appropriate means.
are integrally connected, and the nozzle part (3a) and the operating pipe part (
3b) is made of a conductive material and constitutes the liquid level detection sensor (3a, b).
前記分注プローブ（３）は上下移動部材（４）で支持さ
れ、上下移動部材（４）は、上下方向のガイド輔驚、：
３）で１−下１１］可能にガイドさイするととらに、適
宜・）手段で制御さ１１．ろぺＩＬ、スモーク（７）で
上下制御さ杭る駆１ｊｌｏ、ユ・ｒ：（６）が付設され
、パルスモータ（７）により駆動口・・！ド（６）、上
下移動部材（４）を介１．で分（ｔイ１７−ゴを一定速
度で上下駆動するプローブ駆動機構（４，５，６，７）
が設けられている。まｊｌ、分ｔ１−ブし・−ブ（３）
内には棒状ヒータ゛（８）が内蔵さ君ている。。The dispensing probe (3) is supported by a vertically moving member (4), and the vertically moving member (4) includes a vertical guide member:
3) In 1-down 11], it is possible to guide the 11. Rope IL, vertically controlled by smoke (7), drive 1jlo, yu r: (6) is attached, drive port by pulse motor (7)...! (6), via the vertically moving member (4) 1. (Probe drive mechanism (4, 5, 6, 7) that drives I17-GO up and down at a constant speed.
is provided. Majl, minute t1-bushi-bu(3)
A rod-shaped heater (8) is built inside. .
さらに、第１図に示すように分注プローブ（３）の、ノ
ズル部（３ａ）さらに作動管部（３ｂ）で構成された液
面検出センづ゛・：３ａ、ｂ）は信号線（３ｃ）を介し
て液面検知回路（ｌＯ）に連設されており、該液面検知
回路（１０）は、液面検出センサ（３ａ、ｂ）に信号線
（３ｃ）を介１．て連設された検出信号発信回路（１１
）、検出（Ａ号発振回路（１１）に連設されたフィルタ
（１２）、基４？−クロック発信回路（１３）、液面設
定回路（１４）、フィＺ１り（１２）と基本クロック発
信回路（１３）および液面設定回路（１４）に連設され
た演算処理回路（１５）等からなり、演算処理回路（１
５）に表示装置（１６）が連ｊｌｉ 、匁れでいろ、。Furthermore, as shown in FIG. ) is connected to the liquid level detection circuit (lO), and the liquid level detection circuit (10) is connected to the liquid level detection sensor (3a, b) via a signal line (3c). Detection signal transmission circuit (11
), detection (filter (12) connected to No. A oscillation circuit (11), base 4?-clock transmission circuit (13), liquid level setting circuit (14), Fi Z1 (12) and basic clock transmission The calculation processing circuit (15) is connected to the circuit (13) and the liquid level setting circuit (14).
5) The display device (16) is connected to the display device (16).
前記検出信号発信回路（１１）は、液面検出センサ（３
ａ、ｂ）に信号線（３ｃ）を介し−ｖ迎結され、液面検
出ヒンサ（３ａ、ｂ）の下降時に、７ノ＝＜、、１部（
３ａ）の先端部によって収容容器（１）内の空気（ｂ）
の静電容ＩＮと、同先端部が液体（ａ）に接触しメ：・
）祭の液体（ａ）の１″ｉ％′心容ｆｉ１により、該静
電容量を直接的に電位として把握するものであって、第
２図に示すような静電容量に基づく波形として把握した
演出信号（ｌｌａ）を出力して、フィルタ（１２）を通
しクリアし、た後に演算処理囲路（１５）に人力する。The detection signal transmission circuit (11) includes a liquid level detection sensor (3
a, b) through the signal line (3c), and when the liquid level detection hinges (3a, b) descend, 7 no = <, 1 part (
Air (b) inside the container (1) by the tip of 3a)
When the capacitance IN and the tip of the capacitance IN come into contact with the liquid (a),
) The capacitance can be directly understood as a potential using the 1''i%' heart rate fi1 of the festival liquid (a), and can be understood as a waveform based on the capacitance as shown in Figure 2. The produced effect signal (lla) is outputted, cleared through a filter (12), and then manually inputted to an arithmetic processing circuit (15).
首記空気（ｂ ）と首記液体（ａ）の両静電容量の差は
太きく ｎＵ記検出信号（ｌｌａ）の波形が適格に得ら
れ、該検出信号（ｌｌａ）の波長（ｅ）は収容容器（１
）内の液面の向」−に比例して変化ケる。The difference between the capacitances of the air (b) and the liquid (a) is large. The waveform of the detection signal (lla) is properly obtained, and the wavelength (e) of the detection signal (lla) is Storage container (1
) changes in proportion to the direction of the liquid level within ).
前記基本り［ｌツク発信回路（１３）は、第３図に示４
゛ような基本クロック信号（１３ａ）を出力し演算処理
回路（１５）に入力して、前記検出信号（Ｉｌａ）と比
較しその波長（ｆ’）をクロック数（ｎ）どして演算し
デジタル信号とするためのものであり、前記液面設定回
路（１４）は、収容容器（１）内の空気（ｂ）、液体（
、ａ）の各種７＝−夕が予めインプットされ液面判断の
データ信ｊＴ（’１４ａ）（設定値）とし５て演算処理
回路（１５）に入りする。。The basic transmission circuit (13) is shown in FIG.
The basic clock signal (13a) is outputted and inputted to the arithmetic processing circuit (15), compared with the detection signal (Ila), and its wavelength (f') is calculated by multiplying the number of clocks (n) to generate a digital signal. The liquid level setting circuit (14) is used to signal the air (b) and liquid (
, a) are inputted in advance and entered into the arithmetic processing circuit (15) as a data signal jT('14a) (set value) for determining the liquid level. .
ｌｉ！ｆ記演算処理回路（１５）は、検出信号検出回路
（１１）か・二・出）３ ｇれフィルタ（１２）でクリ
アされた検出信号（Ｉｌａ）を入力１．基本クロック発
信回路（１３）から、（力される基本タロツク信号（１
３ａ）と比較し、検出信号（ｌｌａ）の波長（１）を基
本クロック（１３ａ）のクロック数（ｎ）に計数、換算
してデジタル信号にするとともに、設計数クロック数（
ｎ）は、液体（ａ）の容器内の高さに対応して変化し液
面設定回路（１４）から人力されるデータ信号（１４ａ
）と比較され、データ信号（１４ａ）即ちその設定値に
対し前記計算クロック数（ｎ）が所定値以上の場合のみ
、分圧プローブ（３）のノズル部（３ａ）先端部が収容
容器（１）内の液体（ａ）の液面に到達したと判断し、
液面検知信号（１５ａ）を出力して表示器（１６）に表
示する。前記計算クロック数（ｎ）は、検出信号（ｌｌ
ａ）の整数倍の波長を（ｒ＋／）を計数することにより
、第２図に示す処理ｎ０＋α個のα値が増大され、検出
精度を高めることができる。li! The arithmetic processing circuit (15) inputs the detection signal (Ila) cleared by the detection signal detection circuit (11) (1.2.output)3.g filter (12). From the basic clock generation circuit (13), the basic tarok signal (1
3a), the wavelength (1) of the detection signal (lla) is counted and converted to the number of clocks (n) of the basic clock (13a) to make it into a digital signal, and the designed number of clocks (
n) is a data signal (14a) that changes depending on the height of the liquid (a) in the container and is input manually from the liquid level setting circuit (14).
), and only when the calculated clock number (n) is greater than or equal to a predetermined value with respect to the data signal (14a), that is, its set value, the tip of the nozzle part (3a) of the partial pressure probe (3) is connected to the container (1). ) is determined to have reached the liquid level of liquid (a),
A liquid level detection signal (15a) is output and displayed on the display (16). The calculation clock number (n) is determined by the detection signal (ll
By counting (r+/) wavelengths that are integral multiples of a), the n0+α α values shown in FIG. 2 are increased, and detection accuracy can be improved.
さらに、前記液面検知信号（１５ａ）は、分注プローブ
（３）を上下両するパルスモータ（７）の制御信号とし
て人力され、該パルスモータ（７）は、該液面検知信号
（１５ａ）の入力に基づき制御され分注プローブ（３）
を所定長だけ下降して停止し、ノズル部（３ａ）の先端
部を液面（ａ）の液面下に所定長たけ確実に浸漬せしめ
、ノズル部（３ａ）による液体（ａ）の吸水用を確保し
、ノズル部（３ａ）内に所定量の液体（ａ）が吸引され
ると、分注プローブ（３）か上昇される。Further, the liquid level detection signal (15a) is manually input as a control signal for a pulse motor (7) that moves the dispensing probe (3) up and down, and the pulse motor (7) receives the liquid level detection signal (15a). Dispensing probe (3) controlled based on the input of
is lowered by a predetermined length and stopped, and the tip of the nozzle part (3a) is reliably immersed for a predetermined length under the liquid level (a), so that the nozzle part (3a) absorbs the liquid (a). When a predetermined amount of liquid (a) is sucked into the nozzle part (3a), the dispensing probe (3) is raised.
前記のような自動分析装置においては、収容容器（１）
内に収容されている液体（ａ）量、つまり液面の高さか
一定でなく、収容容器内に分注プローブ（３）のノズル
部（３ａ）を単に下降するだけでは、ノズル部の先端部
が液面下に達しているかどうか不明であり、また、液面
下に達しても、ノズル部による液体の吸引により液面が
下降し途中から吸引できなくなって吸引量のバラツキが
生じるため、同液体の液面検出は極めて重要となり、本
発明では、前述のように分注プローブ（３）自体を液面
検出センサ（３ａ、ｂ）として兼用するとともに、該液
面検出センサにより収容容器（１）内の空気（ｂ）と液
体（ａ）の両静電容量を検出信号（ｌｌａ）とするもの
であって、該検出信号（ｌｌａ）は、空気と液体の大き
い静電容量の差に基づき確実、正確な波形信号として得
られ、従来のような空気、液体および収容容器等の小さ
い導電率を把握する必要がなく、前記分析装置で使用さ
れる比較的に小さい収容容器（１）内の小遣の空気、液
体の場合でも前記静電容量に基づき前記検出信号（ｌｌ
ａ）が適格に把握され、優れた検出信号、信頼性が得ら
れる。また、前記液面検知回路（１０）によって、前記
検出信号（ｌｌａ）はデノタル信号化され、さらに液面
設定回路（１４）にＪ−るデータ信号（１４ａ）（設定
値）により、ノイズ等による判断が是正されて液面検知
性能、信頼性がさらに高められている。In the automatic analyzer as described above, the storage container (1)
The amount of liquid (a) contained in the container, that is, the height of the liquid level, is not constant, and simply lowering the nozzle portion (3a) of the dispensing probe (3) into the storage container will cause the tip of the nozzle portion to It is unclear whether the liquid has reached below the liquid level, and even if it reaches below the liquid level, the liquid level will drop due to the suction of the liquid by the nozzle, and suction will no longer be possible midway through, resulting in variations in the amount of suction. Detection of the liquid level is extremely important, and in the present invention, as described above, the dispensing probe (3) itself also serves as the liquid level detection sensor (3a, b), and the liquid level detection sensor is used to detect the storage container (1). ), and the detection signal (lla) is based on the large capacitance difference between the air and the liquid. It is obtained as a reliable and accurate waveform signal, and there is no need to grasp the small conductivity of air, liquid, storage container, etc. as in the conventional case, and it is possible to obtain a reliable and accurate waveform signal. Even in the case of pocket money air or liquid, the detection signal (ll
a) can be properly grasped, and excellent detection signals and reliability can be obtained. The liquid level detection circuit (10) converts the detection signal (lla) into a digital signal, and furthermore, the data signal (14a) (setting value) sent to the liquid level setting circuit (14) is used to prevent noise, etc. Judgment has been corrected to further improve liquid level detection performance and reliability.
分圧ノズル（３）には、棒状ヒータ（８）が付設されて
おり、該棒状ヒータ（８）から発するノイズは液面検出
センサ（３ａ、ｂ）の検出に直接的な影響をらたらすた
め、図示省略した適宜の制御手段により分注プローブ（
３）の下降時に配線のオフ・オフによって該棒状ヒータ
（８）は自動的に不作動に自動制御される。A rod-shaped heater (8) is attached to the partial pressure nozzle (3), and the noise emitted from the rod-shaped heater (8) has a direct effect on the detection by the liquid level detection sensor (3a, b). , the dispensing probe (
3) When the rod heater (8) is lowered, the rod heater (8) is automatically controlled to be inactive by turning the wiring off and on.
（発明の効果）
本発明は、前述のような構成になっており、液体の収容
容器の上方に配設されて上下動１２同液体を吸引オろ分
注ブ［コープのノズル部自体を、収容容器内の空気と液
体の静電容量を検出する液面検出センサにしてるいため
、該液面検出センサによって大きい空気と液体の静電容
量の入きい差に基づき同液体の液面との接触の有無に起
因する静電容量の変化により確実、正確な波形の検出借
りか得られ、液面検知回路は同検出信弓に堪づき演算処
理して適格な液面検知信号を出力し、優れた０７ｊ記検
出信号に基づき液面検知性能、信頼性が苦しく向上され
ている。(Effects of the Invention) The present invention has the above-mentioned configuration, and is arranged above the liquid storage container and moves up and down with 12 suction or dispensing tubes [the nozzle part of the cope itself]. Since the liquid level detection sensor detects the capacitance between the air and liquid in the storage container, the sensor detects contact with the liquid surface based on the large difference in capacitance between the air and liquid. The change in capacitance caused by the presence or absence of the signal allows reliable and accurate waveform detection, and the liquid level detection circuit processes the same detection signal and outputs a suitable liquid level detection signal, making it an excellent product. Based on the detection signal described in 07j, the liquid level detection performance and reliability have been improved.
さらに、分注プローブのノズル部の先端部自体によって
液面への接触が検知されるため、明記検知信号に基づき
分注プローブは前記接触の時点から下降制御されること
になり、ノズル部の先端部の液面下への浸漬深さが適格
に制御されて、ノズル部による液体の吸入ｌ、精度、信
頼性が得られ、分圧プローブにより優れた分注性能か得
られる。Furthermore, since contact with the liquid surface is detected by the tip of the nozzle part of the dispensing probe itself, the dispensing probe is controlled to descend from the point of contact based on the specified detection signal, and the tip of the nozzle part The immersion depth of the part below the liquid surface is properly controlled, and the nozzle part provides suction, precision, and reliability of the liquid, and the partial pressure probe provides excellent dispensing performance.
第１図は本発明の一実施例を示Ｖ装置機構図、第２図は
第１図の液面検知回路の検出信号と基本クロックの波形
比較図である。
１、収容容器、 ３・分注プローブ、
３ａ、ノズル部、 ３ ａ、ｂ：液面検出センサ、１０
ＫＪＬ面検知回路
第１図
投FIG. 1 is a mechanical diagram of a V device showing an embodiment of the present invention, and FIG. 2 is a waveform comparison diagram of a detection signal of the liquid level detection circuit of FIG. 1 and a basic clock. 1. Storage container, 3. Dispensing probe, 3a, nozzle part, 3 a, b: Liquid level detection sensor, 10
KJL surface detection circuit Figure 1
Claims (1)
吸引する分注プローブのノズル部自体を、前記収容容器
内の空気と液体の静電容量を検出する液面検出センサと
し、該液面検出センサに連設され前記静電容量の検出に
基づき液面検出信号を出力する液面検知回路を具備した
ことを特徴とする液面検知装置。The nozzle part of the dispensing probe that is placed above the liquid storage container and moves up and down to suck the liquid is used as a liquid level detection sensor that detects the capacitance between the air and the liquid in the storage container. A liquid level detection device comprising a liquid level detection circuit that is connected to a surface detection sensor and outputs a liquid level detection signal based on the detection of the capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63185529A JP2797100B2 (en) | 1988-07-27 | 1988-07-27 | Liquid level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63185529A JP2797100B2 (en) | 1988-07-27 | 1988-07-27 | Liquid level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0236314A true JPH0236314A (en) | 1990-02-06 |
| JP2797100B2 JP2797100B2 (en) | 1998-09-17 |
Family
ID=16172397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63185529A Expired - Lifetime JP2797100B2 (en) | 1988-07-27 | 1988-07-27 | Liquid level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2797100B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014211321A (en) * | 2013-04-17 | 2014-11-13 | 株式会社 Ｊｅｏｌ Ｒｅｓｏｎａｎｃｅ | Rotation control device of sample tube for nmr |
| US10451467B2 (en) * | 2014-10-08 | 2019-10-22 | Semiconductor Components Industries, Llc | Level sensor and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63111425A (en) * | 1986-10-29 | 1988-05-16 | Hitachi Ltd | Liquid level detector |
-
1988
- 1988-07-27 JP JP63185529A patent/JP2797100B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63111425A (en) * | 1986-10-29 | 1988-05-16 | Hitachi Ltd | Liquid level detector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014211321A (en) * | 2013-04-17 | 2014-11-13 | 株式会社 Ｊｅｏｌ Ｒｅｓｏｎａｎｃｅ | Rotation control device of sample tube for nmr |
| US10451467B2 (en) * | 2014-10-08 | 2019-10-22 | Semiconductor Components Industries, Llc | Level sensor and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2797100B2 (en) | 1998-09-17 |
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