JPS60194319A - Liquid residue detector - Google Patents
Liquid residue detectorInfo
- Publication number
- JPS60194319A JPS60194319A JP4909184A JP4909184A JPS60194319A JP S60194319 A JPS60194319 A JP S60194319A JP 4909184 A JP4909184 A JP 4909184A JP 4909184 A JP4909184 A JP 4909184A JP S60194319 A JPS60194319 A JP S60194319A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- thermistor
- liquid level
- voltage
- container
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
- G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は液体残量検出装置に係シ、特に生化学自動分析
装置などの液体状試薬の残量を検出するのに好適な液体
残量検出装置に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a remaining liquid amount detection device, and in particular, a remaining liquid amount detection device suitable for detecting the remaining amount of a liquid reagent in an automatic biochemical analyzer. It is related to the device.
最近、生化学自動分析装置などにおいて、試薬がなくな
ったかどうかをオペレータに知らせ、試薬がなくなった
ことによるトラブルをなくすようにする要求がある。そ
のため、試薬の補給を必要とするときに、それを検出し
てオペレータに知らせる液体残量検出装置が必要になっ
てきた。Recently, there has been a demand for automatic biochemical analyzers and the like to notify operators of whether reagents have run out, thereby eliminating troubles caused by running out of reagents. Therefore, a need has arisen for a remaining liquid amount detection device that detects and notifies an operator when a reagent needs to be replenished.
従来、このような試薬の消費を検出する方法としては、
試薬が入っている試薬容器の重さがある規定値以下にな
ったことを検出する重さ検出方法や２本の金属性電極を
試薬容器内に設け、試薬の導電性を利用して試薬液面を
検出する液面検出方法などがある。しかし、前者は、装
置が大きくなシ、かつ、誤差が大きいという欠点がある
。また、後者は、電極に電圧を印加したときに試薬の電
気分解が生ずるという欠点がある。Traditionally, methods for detecting consumption of such reagents include:
There is a weight detection method that detects when the weight of a reagent container containing a reagent falls below a specified value, and two metal electrodes are installed inside the reagent container, and the reagent liquid is detected using the conductivity of the reagent. There are liquid level detection methods that detect the liquid surface. However, the former method has disadvantages in that the device is large and the error is large. The latter also has the disadvantage that electrolysis of the reagent occurs when a voltage is applied to the electrodes.
本発明は上記に鑑みてなされたもので、その目的とする
ところは、構成が簡単で、しかも、液体の残量を正確に
検出することができる液体残量検出装置を提供すること
にある。The present invention has been made in view of the above, and an object of the present invention is to provide a liquid remaining amount detection device that has a simple configuration and can accurately detect the remaining amount of liquid.
本発明の特徴は、液体を入れた容器の液体残量検出のた
めの液面検出位置に設けた自己加熱型のサーミスタと、
このサーミスタに所定の抵抗値の抵抗を介して所定電圧
を印加する電源と、一方の入力端子に基準電圧を、他方
の入力端子に上記サーミスタの端子電圧を入力させであ
る比較回路とよシなる構成とした点にある。The present invention is characterized by a self-heating thermistor provided at a liquid level detection position for detecting the remaining amount of liquid in a container containing liquid;
It consists of a power source that applies a predetermined voltage to this thermistor through a resistor with a predetermined resistance value, and a comparator circuit that inputs the reference voltage to one input terminal and the terminal voltage of the thermistor to the other input terminal. The point lies in the structure.
以下本発明を第１図、第２図に示した実施例および第３
図、第４図を用いて詳細に説明する。Hereinafter, the present invention will be explained by the embodiments shown in FIGS.
This will be explained in detail using FIG.
第１図は本発明に係る液体残量検出装置を備えた液体容
器の構造図である。１は液体（試薬）２が入っている容
器で、液体２はポンプ３によってチューブ４を介して吸
引され、消費される。容器１の液体残量検出のための液
面検出位置には、本発明に係る液体残量検出装置の液面
検出センサとしてのサーミスタ５が配置してあって、絶
縁されたパイプ状のチューブ６によってサーミスタ５の
リード線が容器１の外部に取り出されている。サーミス
タ５は、直径２震程度のガラスピーズに封入されておシ
、サーミスタ５の抵抗自身で消費されるジュール熱によ
って加熱される自己加熱型のものが用いてあシ、これを
数十ミリワット以上で使用し、サーミスタ５が液体２中
にあるときと空気中にあるときとの温度差による抵抗値
の変化を利用して液面を検出するようにしである。FIG. 1 is a structural diagram of a liquid container equipped with a liquid remaining amount detection device according to the present invention. 1 is a container containing a liquid (reagent) 2, and the liquid 2 is sucked through a tube 4 by a pump 3 and consumed. At a liquid level detection position for detecting the remaining amount of liquid in the container 1, a thermistor 5 as a liquid level detection sensor of the remaining liquid amount detecting device according to the present invention is arranged, and an insulated pipe-shaped tube 6 is disposed. The lead wire of the thermistor 5 is taken out to the outside of the container 1. The thermistor 5 is a self-heating type that is sealed in a glass bead with a diameter of about 2 quakes and is heated by the Joule heat consumed by the resistance of the thermistor 5, which has a power of several tens of milliwatts or more. The liquid level is detected by utilizing the change in resistance value due to the temperature difference between when the thermistor 5 is in the liquid 2 and when it is in the air.
第２図は本発明の液体残量検出装置の電気回路の一実施
例を示す回路図である。サーミスタ５には数十ミリワッ
ト以上の電力が消費されるように電圧■が抵抗７を介し
て印加しである。いま、サーミスタ５が液体２中にある
場合は、液体２に冷却され、サーミスタ５の温度は、サ
ーミスタ５の熱容量が微小であるからほとんど上昇せず
、はぼ液体２の温度と同一になる。この状態から液体２
がポンプ３によって吸引されて液面が低下し、サーミス
タ５が空気中に置かれると、サーミスタ５が自己加熱に
より温度が上昇し、抵抗値が変化する。FIG. 2 is a circuit diagram showing one embodiment of the electric circuit of the liquid remaining amount detection device of the present invention. A voltage (2) is applied to the thermistor 5 via the resistor 7 so that several tens of milliwatts or more of power is consumed. Now, if the thermistor 5 is in the liquid 2, it will be cooled by the liquid 2, and the temperature of the thermistor 5 will hardly rise because the heat capacity of the thermistor 5 is minute, and will be approximately the same as the temperature of the liquid 2. From this state, liquid 2
When the liquid level is lowered by suction by the pump 3 and the thermistor 5 is placed in the air, the temperature of the thermistor 5 rises due to self-heating, and the resistance value changes.
第３図はサーミスタ５の温度と抵抗値との関係を示す縮
図である。FIG. 3 is a miniature diagram showing the relationship between the temperature and resistance value of the thermistor 5.
第２図の回路においては、電圧■を１５ｖ１抵抗７の抵
抗値は１ｋにｌ＆しである。第４図は、室温と液体温度
とが同一である場合のサーミスタ５が液体２中にある場
合と空気中にある場合の室温とサーミスタ５による電圧
降下（端子電圧）との関係を示す線図で、曲線ａはサー
ミスタ５が液体２中にある場合、曲線すはサーミスタ５
が空気中にある場合を示す。第４図かられかるように、
サーミスタ５が空気中にある場合は、液体２中にある場
合よυ電圧ｖ丁が低くなる。この変化は、第２図の比較
回路８のマイナス入力端子に入力させてあシ、プラス入
力端子に入力させである基準電圧Ｖｉと比較され、■テ
ンＶａの場合は、比較回路８の出力Ｖｏが０”レベルと
なシ、逆の場合はＶｏが６１”レベルとなる。すなわち
、比較回路８の出力Ｖｏが″０″レベルのときは、サー
ミスタ５が液体２中にあシ、１”レベルのときは、空気
中にあることを示す。In the circuit of FIG. 2, the voltage 1 is 15v1 and the resistance value of the resistor 7 is 1k. FIG. 4 is a diagram showing the relationship between the room temperature and the voltage drop (terminal voltage) due to the thermistor 5 when the thermistor 5 is in the liquid 2 and in the air when the room temperature and the liquid temperature are the same. If the thermistor 5 is in the liquid 2, the curve a is the thermistor 5.
is in the air. As shown in Figure 4,
When the thermistor 5 is in the air, the voltage υ is lower than when it is in the liquid 2. This change is compared with the reference voltage Vi input to the negative input terminal and the positive input terminal of the comparator circuit 8 in FIG. If Vo is at 0" level, and vice versa, Vo will be at 61" level. That is, when the output Vo of the comparison circuit 8 is at the "0" level, it indicates that the thermistor 5 is in the liquid 2, and when it is at the 1" level, it indicates that it is in the air.
なお、第４図から、基準電圧Ｖｘ＝８Ｖとすると、室温
が１０〜４３Ｃの間においては、サーミスタ５が液体２
の中にある場合は、空気中にある場合よシもＶｔが大き
いので、サーミスタ５が液体２中にあるか空気中にある
かを知ることができ、液体残量が少なくなったか否かを
検出することができる。Furthermore, from FIG. 4, if the reference voltage Vx is 8V, the thermistor 5 is connected to the liquid 2 when the room temperature is between 10 and 43C.
Since Vt is larger when the thermistor 5 is in the liquid 2 or in the air than when it is in the air, it is possible to know whether the thermistor 5 is in the liquid 2 or in the air, and whether the remaining liquid level is low or not. can be detected.
上記したように、本発明の実施例によれば、容器１内の
液体の残量が所定値以下になったか否かを正確に知るこ
とができ、なお、液面検出センサとしてサーミスタ５を
用いているので、構成が簡単である。As described above, according to the embodiment of the present invention, it is possible to accurately know whether the remaining amount of liquid in the container 1 has fallen below a predetermined value, and the thermistor 5 is used as the liquid level detection sensor. The configuration is simple.
なお、本発明に係る液体残量検出装置は、自動分析装置
などの廃液が満水になったかどうかを検出するのに利用
することもできることはいうまでもない。It goes without saying that the liquid remaining amount detection device according to the present invention can also be used to detect whether a waste liquid in an automatic analyzer or the like is full of water.
以上説明したように、本発明によれば、構成が簡単で、
しかも、液体の残量を正確に検出できるという効果があ
る。As explained above, according to the present invention, the configuration is simple;
Moreover, there is an effect that the remaining amount of liquid can be detected accurately.
第１図は本発明に係る液体残量検出装置を備えた液体容
器の構造図、第２図は本発明の液体残量検出装置の電気
回路の一実施例を示す回路図、第３図はサーミスタの温
度と抵抗値との関係を示す線図、第４図は室温と液体温
度が同一の場合のサーミスタが液体中にある場合と空気
中にある場合の室温とサーミスタによる電圧降下との関
係を示す線図である。
１・・・容器、２・・・液体、５・・・サーミスタ、７
・・・抵抗、翳（関
電
宿２図
＼ｌ
（”ｖメ）竪■誹ε亡−五
←（△）１△召）FIG. 1 is a structural diagram of a liquid container equipped with a remaining liquid amount detecting device according to the present invention, FIG. 2 is a circuit diagram showing an example of an electric circuit of the remaining liquid amount detecting device of the present invention, and FIG. A diagram showing the relationship between the temperature and resistance value of a thermistor. Figure 4 shows the relationship between room temperature and voltage drop due to the thermistor when the thermistor is in liquid and in air when the room temperature and liquid temperature are the same. FIG. 1... Container, 2... Liquid, 5... Thermistor, 7
...Resistance, shadow (Kanden-juku 2 figure \l ("vme) vertical ■ denigration ε death - five ← (△) 1 △ summon)"
Claims (1)
位置に設けた自己加熱屋のサーミスタと、該サーミスタ
に所定の抵抗値の抵抗を介して所定電圧を印加する電源
と、一方の入力端子に基準電圧を、他方の入力端子に前
記サーミスタの端子電圧を入力させである比較回路とよ
シなシ、該比較回路は前記サーミスタが前記液体中にあ
るときと空気中にあるときとで異なるレベルの信号を出
力するように構成しであることを特徴とする液体残量検
出装置。1. A self-heating thermistor installed at a liquid level detection position for detecting the remaining amount of liquid in a container containing liquid, and a power supply that applies a predetermined voltage to the thermistor via a resistor with a predetermined resistance value; This is similar to a comparator circuit in which the reference voltage is input to the input terminal of , and the terminal voltage of the thermistor is input to the other input terminal. A liquid remaining amount detection device configured to output signals of different levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4909184A JPS60194319A (en) | 1984-03-16 | 1984-03-16 | Liquid residue detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4909184A JPS60194319A (en) | 1984-03-16 | 1984-03-16 | Liquid residue detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60194319A true JPS60194319A (en) | 1985-10-02 |
Family
ID=12821426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4909184A Pending JPS60194319A (en) | 1984-03-16 | 1984-03-16 | Liquid residue detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60194319A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452505U (en) * | 1987-09-29 | 1989-03-31 | ||
| US7181965B2 (en) | 2004-12-20 | 2007-02-27 | International Business Machines Corporation | Self-heated liquid level sensor |
| CN111084562A (en) * | 2019-12-04 | 2020-05-01 | 九阳股份有限公司 | Food processing machine |
-
1984
- 1984-03-16 JP JP4909184A patent/JPS60194319A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452505U (en) * | 1987-09-29 | 1989-03-31 | ||
| US7181965B2 (en) | 2004-12-20 | 2007-02-27 | International Business Machines Corporation | Self-heated liquid level sensor |
| CN111084562A (en) * | 2019-12-04 | 2020-05-01 | 九阳股份有限公司 | Food processing machine |
| CN111084562B (en) * | 2019-12-04 | 2022-06-17 | 九阳股份有限公司 | Food processing machine |
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