JP2001208593A - Inmersion type water level indicator for sewage water - Google Patents
Inmersion type water level indicator for sewage waterInfo
- Publication number
- JP2001208593A JP2001208593A JP2000021738A JP2000021738A JP2001208593A JP 2001208593 A JP2001208593 A JP 2001208593A JP 2000021738 A JP2000021738 A JP 2000021738A JP 2000021738 A JP2000021738 A JP 2000021738A JP 2001208593 A JP2001208593 A JP 2001208593A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- sewage
- detector
- level meter
- type water
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は下水道や下水処理
場、海水などの水位を測定するため投込式水位計に関
し、特に、汚水または腐食性の液体の水位を測定する投
込式水位計のに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level meter for measuring the water level of sewers, sewage treatment plants, seawater, etc., and more particularly to a water level meter for measuring the water level of sewage or corrosive liquid. It is about.
【0002】[0002]
【従来の技術】従来の水頭圧力を利用した投込式水位計
は図2に示すように検出器1と変換器2からなり、両者
を電線3および、大気圧を検出器に導入するパイプ4を
組み込んだ中空ケーブル5で接続している。検出器は水
中6に沈めて設置されるため、検出器の先端にある圧力
センサで圧力を測定し、圧力値を変換器で水位に変換し
レベル信号として指示計7に表示し受信計器8に伝送し
ている。2. Description of the Related Art As shown in FIG. 2, a conventional water level gauge utilizing a head pressure comprises a detector 1 and a converter 2, both of which are an electric wire 3 and a pipe 4 for introducing atmospheric pressure to the detector. Are connected by a hollow cable 5 in which. Since the detector is installed submerged in the water 6, the pressure is measured with a pressure sensor at the tip of the detector, the pressure value is converted to a water level by a converter, displayed as a level signal on the indicator 7, and displayed on the receiving meter 8. Transmitting.
【0003】また、図示はしないが他の投込式水位計の
構成として、検出器と中空ケーブルからなり、変換器を
使わないものもある。この場合はレベル表示部はない。[0003] Further, although not shown, another configuration of the water-immersed water level gauge includes a detector and a hollow cable, and does not use a converter. In this case, there is no level indicator.
【0004】検出器に加わる圧力は水の水頭圧と大気圧
の和であり、水位計としては大気圧はレベルに関係しな
いため不要である。しかしながら、大気圧は時々刻々と
変動し、水位計の一般的精度である±0.5%を越える
誤差となり、無視できない大きな圧力変化があるため、
圧力センサの他方には大気圧をパイプで検出器内に導入
し、大気圧を相殺するように構成して正確な水位測定を
している。[0004] The pressure applied to the detector is the sum of the head pressure of the water and the atmospheric pressure. The atmospheric pressure is not required for a water level gauge because it does not depend on the level. However, the atmospheric pressure fluctuates from moment to moment, resulting in an error exceeding the general accuracy of a water level gauge of ± 0.5%, and there is a large pressure change that cannot be ignored.
Atmospheric pressure is introduced into the detector by a pipe at the other side of the pressure sensor, and is configured to cancel the atmospheric pressure to perform accurate water level measurement.
【0005】このような水位計を下水道やポンプ場、下
水処理場などの腐食液や海水で使用すると以下のような
問題が発生することがあった。When such a water level gauge is used for corrosive liquid or seawater in a sewer, a pumping station, a sewage treatment plant, or the like, the following problems may occur.
【0006】据え付け後数年で液位信号が不安定になっ
たり、オーバースケールすることがあった。この原因を
調査した結果、検出器に腐食性水分が入りセンサや電気
信号増幅回路を破損したり、電子回路の絶縁抵抗を低下
して液位信号が不安定になっていることが判った。不具
合要因として次のことが考えられた。In several years after installation, the liquid level signal may become unstable or overscale. As a result of investigating the cause, it was found that corrosive moisture entered the detector and damaged the sensor and the electric signal amplifier circuit, or the insulation resistance of the electronic circuit was lowered, and the liquid level signal became unstable. The following were considered as causes of the failure.
【0007】(1)検出器のゴムシールの腐食によるシー
ル性の劣化。(1) Deterioration of sealability due to corrosion of the rubber seal of the detector.
【0008】(2)検出器の金属ケースの腐食による腐食
液の侵入。(2) Invasion of corrosive liquid due to corrosion of the metal case of the detector.
【0009】(3)測定液中の感圧部に生物が付着成長し
圧力測定に誤差発生。(3) Organisms adhere to and grow on the pressure-sensitive portion in the measurement solution, causing an error in pressure measurement.
【0010】(1)のゴムシールの腐食は下水の腐食成
分が問題となり、化学工場や製造工場からの下水が流入
する場合は、下水の成分に硫酸イオン、塩酸イオン、燐
酸イオン、アンモニアイオン、ナトリウムイオン、カリ
ウムイオン等が高濃度で含まれるため、Oリング等のゴ
ムシールの材質が適切でなかったり、シール距離が短い
ときにゴムシールが腐食して汚水の侵入が考えられる。
同じことは水に有機溶剤や油脂が含まれる場合も生じ
る。[0010] The corrosion of the rubber seal of (1) involves a problem of sewage corrosion components. When sewage flows from a chemical plant or a manufacturing plant, the components of the sewage include sulfate ions, hydrochloric acid ions, phosphate ions, ammonia ions, and sodium ions. Since ions, potassium ions and the like are contained at a high concentration, it is conceivable that the material of the rubber seal such as the O-ring is not appropriate, or that the rubber seal is corroded when the seal distance is short, thereby invading sewage.
The same occurs when water contains an organic solvent or fat.
【0011】(2)の問題については、検出器ケースの
材質はステンレス鋼で作られており、一般の河川水の測
定では全く問題無い。しかし、下水などの腐食環境では
検出器が測定水中に没している時は良いが、レベルが低
下して気水界面が検出器の付近で汚水レベルが変化する
と腐食反応が促進される。その理由は汚水が濃縮される
ことにある。大気から酸素の供給がよくなり、金属のす
きま腐食が深厚するのである。また、酸化やアルカリ腐
食が深厚して検出器ケースに孔があき、測定液がケース
に侵入して電子回路が故障したり、絶縁抵抗が低下して
問題になることが判った。Regarding the problem (2), the material of the detector case is made of stainless steel, and there is no problem in the measurement of general river water. However, in a corrosive environment such as sewage, it is good when the detector is immersed in the measurement water, but when the level decreases and the water-water interface changes near the detector, the corrosion reaction is accelerated. The reason is that sewage is concentrated. The supply of oxygen from the atmosphere is better, and the crevice corrosion of the metal is deeper. In addition, it was found that the oxidation and alkali corrosion were so deep that a hole was formed in the detector case, and that the measurement liquid penetrated the case, causing a failure in the electronic circuit and a decrease in insulation resistance.
【0012】(3)は主に海水レベル測定において発生
する問題で、圧力を感ずるダイアフラムに貝殻や海草が
付着繁茂し、圧力伝達部の剛性が大きくなり測定に誤差
が発生することである。この問題は経時的に少しずつ進
行するため気付かないときもある。The problem (3) mainly occurs in seawater level measurement. The problem is that shells and seaweed adhere to and proliferate on the diaphragm that senses pressure, and the rigidity of the pressure transmitting unit increases, causing an error in measurement. Sometimes this problem goes unnoticed as it progresses slowly over time.
【0013】このような問題に対して従来は検出器ケー
スの材質を変えていた。すなわち、耐酸性や耐アルカリ
性が必要な場合はセラミックやチタンを使用していた。
この場合は製作が非常に難しく、特に部品の接合やシー
ル部構造が特殊で、完成した検出器も非常に高価であり
実用的でなかった。特にセラミックで製作した場合は加
工自体も困難である。また、海水用にはハステロイCな
どが使われているが、海水に対する耐食性は良いが貝殻
や海草付着に対しては効果が無かった。In order to solve such a problem, the material of the detector case has conventionally been changed. That is, when acid resistance or alkali resistance is required, ceramic or titanium has been used.
In this case, the fabrication is very difficult, especially the joining of parts and the structure of the seal portion are special, and the completed detector is also very expensive and impractical. In particular, when it is made of ceramic, processing itself is difficult. Although Hastelloy C is used for seawater, it has good corrosion resistance to seawater, but has no effect on the adhesion of shells and seaweed.
【0014】[0014]
【発明が解決しようとする課題】検出器が測定環境から
うける障害を排除して検出器へ湿分や汚水が浸入するこ
とのない構成とし、センサや電気信号増幅回路の腐食や
吸湿による絶縁抵抗低下を無くする。また、生物による
圧力測定誤差のない投込式水位計とする。SUMMARY OF THE INVENTION The detector is configured to eliminate obstacles from the measurement environment so that moisture and sewage do not enter the detector, and to provide insulation resistance due to corrosion and moisture absorption of the sensor and the electric signal amplifier circuit. Eliminate drop. In addition, the water level gauge shall be an injection-type water level meter with no pressure measurement error caused by living organisms.
【0015】[0015]
【課題を解決するための手段】第1の手段は従来の一般
河川で使用している検出器の外周に耐食性の優れた外套
を被せることにより検出器を保護するものである。検出
器と外套間の隙間には圧力伝達媒体を封じることにより
圧力測定ができる。The first means is to protect the detector by covering an outer periphery of a conventional detector used in general rivers with a jacket having excellent corrosion resistance. Pressure can be measured by sealing the pressure transmission medium in the gap between the detector and the mantle.
【0016】第2の手段は外套の外表面に貝殻や海草が
付着することを防止するために外套材に生物忌避成分を
混入する。または、生物忌避成分を塗布する。In the second means, a biological repellent component is mixed into the mantle to prevent shells and seaweed from adhering to the outer surface of the mantle. Alternatively, a biorepellent component is applied.
【0017】[0017]
【発明の実施の形態】以下第1の発明を詳細に説明す
る。図1は本発明の検出器を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention will be described in detail below. FIG. 1 shows a detector according to the invention.
【0018】図において、検出器1の外周には外套9が
被せてあり、検出器1と外套9間の隙間には圧力伝達媒
体10を封じている。外套の上部は中空ケーブルに圧力
伝達媒体10が漏れないように金属線やプラスチックの
縛り糸11で縛っている。外套の下部は同材質であるが
他の部分に比べて薄く作り圧力伝達損失が小さくなるよ
うにして測定誤差を無くしている。実用的な厚さとして
0.05〜0.2mm程度である。In the figure, an outer jacket 9 is put on the outer periphery of the detector 1, and a pressure transmission medium 10 is sealed in a gap between the detector 1 and the outer jacket 9. The upper part of the jacket is tied with a metal wire or plastic tying string 11 so that the pressure transmission medium 10 does not leak into the hollow cable. The lower part of the mantle is made of the same material but is made thinner than the other parts, so that the pressure transmission loss is reduced to eliminate measurement errors. The practical thickness is about 0.05 to 0.2 mm.
【0019】外套の材質は形や厚さを容易に変えられ、
柔らかさも幅広く選定できるプラスチックやプラスチッ
クエラストマーおよび、ゴムが良い。The material of the mantle can be easily changed in shape and thickness.
Plastics, plastic elastomers, and rubbers, for which softness can be selected widely, are preferred.
【0020】また、上記外套の材質を選定することによ
り耐食性にも優れ、量産性も良く、安価である。材質と
してプラスチックは耐酸性や耐アルカリ性がよく、耐有
機溶剤に強いポリエチレン、ポリプロピレン、軟質ポリ
塩化ビニール、フッ素樹脂が良い。プラスチックエラス
トマーとしては柔らかく耐食性の良いポリエステルエラ
ストマー、フッ素系熱可塑性エラストマーなどが良い。
また、ゴムは耐候性の良いエチレンプロピレンゴム、耐
油性の良いニトリルゴム、全般的耐食性の良いフッ素ゴ
ムがある。なお、熱収縮性の材料を使用すれば中空ケー
ブルとの封じ部の処理が容易となる。Further, by selecting the material of the jacket, it is excellent in corrosion resistance, good in mass production, and inexpensive. As a material, a plastic is good in acid resistance and alkali resistance, and polyethylene, polypropylene, soft polyvinyl chloride, and fluororesin which are resistant to an organic solvent are good. As the plastic elastomer, a soft polyester elastomer having good corrosion resistance, a fluorine-based thermoplastic elastomer, or the like is preferable.
The rubber includes ethylene propylene rubber having good weather resistance, nitrile rubber having good oil resistance, and fluorine rubber having good overall corrosion resistance. If a heat-shrinkable material is used, the treatment of the sealing portion with the hollow cable becomes easy.
【0021】次に、圧力伝達媒体10は検出器1と外套
を劣化させないものでそれ自体が安定であることが重要
で、安価かつ入手が容易なもので、たとえば、純度の良
い水、油、反応性の少ない多価アルコールが良い。水深
が大きい場合はゲル状ゴムでも良い。Next, it is important that the pressure transmission medium 10 does not deteriorate the detector 1 and the outer jacket and is stable in itself, and is inexpensive and easily available. For example, water, oil, Polyhydric alcohols with low reactivity are preferred. When the water depth is large, gel-like rubber may be used.
【0022】以下図を用いて本発明の他の実施例をのべ
る。図3は外套9の全体厚さが薄くしてあり、中空ケー
ブルとのシール部12は熱収縮して密着させたものであ
る。密着部隙間には接着剤を浸透させてシールを強固と
している。この実施例では外套の圧力損失が小さいため
測定水位が1m以下の低レベルの場合に効果がある。Referring now to the drawings, another embodiment of the present invention will be described. In FIG. 3, the entire thickness of the outer jacket 9 is reduced, and the seal portion 12 with the hollow cable is heat-shrinked and brought into close contact. An adhesive is permeated into the gap between the contact portions to make the seal strong. This embodiment is effective when the measured water level is as low as 1 m or less because the pressure loss of the mantle is small.
【0023】また、温度変化などで圧力伝達媒体10の
体積が変化しても外套9の形が変化して吸収してくれる
ため、温度影響誤差も小さく特性の良い投込式水位計が
得られる。Further, even if the volume of the pressure transmitting medium 10 changes due to a temperature change or the like, the shape of the mantle 9 changes and absorbs the temperature. .
【0024】図4は別の実施例を示すもので、外套9は
比較的厚く作られているために取り扱いが容易である。
この実施例場合は外套9の一部がベローズ13となって
おり圧力伝達損失が小さくなるようにしている。FIG. 4 shows another embodiment, in which the mantle 9 is relatively thick and is easy to handle.
In this embodiment, a part of the jacket 9 is a bellows 13, so that the pressure transmission loss is reduced.
【0025】[0025]
【発明の効果】本発明によれば下水道や処理場、海水な
どの水位を長期間安定して測定できる。According to the present invention, the water level of sewers, treatment plants, seawater, etc. can be measured stably for a long period of time.
【図1】本発明の第1の実施例を示す図である。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図2】従来装置を示す図である。FIG. 2 is a diagram showing a conventional device.
【図3】他の実施例を説明する図である。FIG. 3 is a diagram illustrating another embodiment.
【図4】更に他の実施例を説明する図である。FIG. 4 is a diagram illustrating still another embodiment.
1…検出器、2…変換器、3…電線、4…パイプ、5…
中空ケーブル、6…水中、7…指示計、8…受信計器、
9…外套、10…圧力伝達媒体、11…縛り糸、12…
シール部、13…ベローズ。DESCRIPTION OF SYMBOLS 1 ... Detector, 2 ... Converter, 3 ... Electric wire, 4 ... Pipe, 5 ...
Hollow cable, 6 ... underwater, 7 ... indicator, 8 ... receiver,
9 ... mantle, 10 ... pressure transmission medium, 11 ... binding thread, 12 ...
Seal part, 13 ... bellows.
Claims (7)
上に測定信号を取り出し、大気圧を検出器内に取り込む
中空ケーブルを備えた投込式水位計において、検出器の
外側に外套を設け、検出器と外套間に圧力伝達体を封じ
たことを特徴とする汚水用投込式水位計。1. An immersion type water level meter having a detector installed in sewage and a hollow cable for taking out a measurement signal on the water surface and taking atmospheric pressure into the detector. An immersion type water level meter for sewage wherein an outer jacket is provided, and a pressure transmitter is sealed between the detector and the outer jacket.
ルカリ性、体油性などの耐食性を有するプラスチック、
または、プラスチックエラストマー、ゴムであることを
特徴とする汚水用投込式水位計。2. The plastic according to claim 1, wherein the mantle has corrosion resistance such as acid resistance, alkali resistance, and body oil resistance.
Alternatively, an immersion type water level meter for sewage characterized by being a plastic elastomer or rubber.
一部が柔らかい膜で構成したことを特徴とする汚水用投
込式水位計。3. The method according to claim 1, wherein all of the mantle or
An immersion type water level meter for sewage, characterized in that a part is made of a soft membrane.
多価アルコール、油脂、ゲルなどであることを特徴とす
る汚水用投込式水位計。4. The method according to claim 1, wherein the pressure transmission medium is water,
An immersion water level meter for sewage, characterized by polyhydric alcohols, fats, gels, etc.
混入したことを特徴とする汚水用投込式水位計。5. The immersion type water level meter for sewage according to claim 1, wherein a biological repellent is mixed in the mantle.
上に測定信号を取り出し、大気圧を検出器内に取り込む
中空ケーブルを備えた投込式水位計において、検出器の
外側に全部または、一部が柔らかい膜で構成し、外被に
水生生物付着防止剤を塗布または、混入した外套を設
け、検出器と外套間に圧力伝達体を封じたこを特徴とす
る汚水用投込式水位計。6. An immersion type water level meter provided with a detector installed in sewage and a hollow cable for taking out a measurement signal on the water surface and taking atmospheric pressure into the detector. Spillage for sewage, characterized in that the whole or part of the membrane is made of a soft film, the jacket is coated or mixed with an aquatic organism adhesion inhibitor, and the pressure transmitter is sealed between the detector and the jacket. Water level gauge.
一部が柔らかい膜で構成し外套が交換可能であることを
特徴とする汚水用投込式水位計。7. The method according to claim 6, wherein all of the outer jacket or
A flood-type water level meter for sewage, characterized in that a part of the membrane is made of a soft film and the mantle is replaceable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000021738A JP2001208593A (en) | 2000-01-26 | 2000-01-26 | Inmersion type water level indicator for sewage water |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000021738A JP2001208593A (en) | 2000-01-26 | 2000-01-26 | Inmersion type water level indicator for sewage water |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001208593A true JP2001208593A (en) | 2001-08-03 |
Family
ID=18548107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000021738A Pending JP2001208593A (en) | 2000-01-26 | 2000-01-26 | Inmersion type water level indicator for sewage water |
Country Status (1)
Country | Link |
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JP (1) | JP2001208593A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL425034A1 (en) * | 2018-03-26 | 2019-10-07 | Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie | Equipment for measuring the wetted perimeter in closed channels, particularly in the sewers and rainwater channels |
CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
-
2000
- 2000-01-26 JP JP2000021738A patent/JP2001208593A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL425034A1 (en) * | 2018-03-26 | 2019-10-07 | Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie | Equipment for measuring the wetted perimeter in closed channels, particularly in the sewers and rainwater channels |
CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
EP3848681A1 (en) * | 2020-01-10 | 2021-07-14 | Yokogawa Electric Corporation | Level indicator with protective cover |
JP2021110634A (en) * | 2020-01-10 | 2021-08-02 | 横河電機株式会社 | Water gauge with protective cover |
US11493376B2 (en) * | 2020-01-10 | 2022-11-08 | Yokogawa Electric Corporation | Level indicator with protective cover |
JP7192804B2 (en) | 2020-01-10 | 2022-12-20 | 横河電機株式会社 | Water level gauge with protective cover |
CN113108863B (en) * | 2020-01-10 | 2024-06-07 | 横河电机株式会社 | Liquid level indicator with protective cover |
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