JPH02306123A - Wireless liquid level measuring device - Google Patents
Wireless liquid level measuring deviceInfo
- Publication number
- JPH02306123A JPH02306123A JP1126296A JP12629689A JPH02306123A JP H02306123 A JPH02306123 A JP H02306123A JP 1126296 A JP1126296 A JP 1126296A JP 12629689 A JP12629689 A JP 12629689A JP H02306123 A JPH02306123 A JP H02306123A
- Authority
- JP
- Japan
- Prior art keywords
- liquid level
- measuring device
- level measuring
- conductive material
- lid
- 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 41
- 239000012811 non-conductive material Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract description 12
- 230000037431 insertion Effects 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は給油所等に埋設されている地下タンクの液位を
検出しで遠隔地に無線によっ伝送する装置に関し、より
詳しくは、この装置に使用される送信アンテナの取付は
部に特徴を有する装置に閑する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device that detects the liquid level of an underground tank buried in a gas station, etc. and transmits it wirelessly to a remote location. The installation of the transmitting antenna used in the device is unique to the device.
（従来技術）
一般にガソリンスタンドでは、地下タンクに収容された
燃料油等の液位をフロート式等の液面計により検出し、
これを電気信号に変換してタンクから離れた位置にある
事務所のモニタ装置等へ伝送するようにしでいる。(Prior art) Generally, at a gas station, the liquid level of fuel oil, etc. stored in an underground tank is detected by a liquid level gauge such as a float type.
This is converted into an electrical signal and transmitted to a monitoring device in an office located far from the tank.
この伝送には通常伝送線が用いられるか、伝送線の配線
工事は、舗装の剥離、配線管の埋設、再舗装等の面でコ
ストが嵩む問題を有しでいる。A transmission line is usually used for this transmission, and the wiring work for the transmission line has the problem of increasing costs in terms of peeling off pavement, burying wiring pipes, resurfacing, etc.
これに対し、液位を周波数に変換して無線で伝送するよ
うにした装置は、特別な配線工事を必要としない面で優
れではいるが、反面、地下タンクに設けた鉄製のマンホ
ール内に装置を配設しなければならない関係上、遠隔地
への送信に支障をきたすといった問題を抱えでいる。On the other hand, a device that converts the liquid level into a frequency and transmits it wirelessly is superior in that it does not require special wiring work, but on the other hand, the device is installed in a steel manhole installed in an underground tank. This poses the problem of interfering with transmission to remote locations due to the need to install
（発明が解決しようとする課題）
本発明はこのような無線式の液位測定装置か抱える上述
した問題に鑑みてなされたもので、その目的とするとこ
ろは、鉄製のマンホール内に配設した状態のもとにおい
でも液位情報を遠隔地に支障なく送信することのできる
新たな装置を提供することにある。(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems faced by such wireless liquid level measuring devices, and its purpose is to An object of the present invention is to provide a new device that can transmit liquid level information to a remote location without any trouble even under certain conditions.
（課題を解決するための手段）
すなわち、本発明はかかる課題を達成するための装置と
して、機械的液位測定手段から液位を電気的信号として
取出す機工変換手段と、この電気的信号を無線信号に変
換する送信手段と、送信手段及び電源電池を気密に収納
するケースとを備えた無線式液位測定装■において、液
位測定装置を収納する収納容体の開口部を少なくとも一
部を非導電材により形成した蓋体により覆うとともに、
可撓性の信号線を介して送信手段に接続した送信アンテ
ナをこの非導電材の近傍に位置させて、液位情報を遠隔
地に支障なく送信することができるようにしたものであ
る。(Means for Solving the Problems) That is, the present invention provides a device for achieving the above-mentioned problems, including a mechanical conversion means for extracting the liquid level as an electrical signal from a mechanical liquid level measurement means, and a wireless communication method for transmitting this electrical signal. In a wireless liquid level measuring device (■) equipped with a transmitting means for converting into a signal and a case for airtightly storing the transmitting means and a power source battery, at least a portion of the opening of the storage container housing the liquid level measuring device is closed. Covered with a lid made of conductive material,
A transmitting antenna connected to a transmitting means via a flexible signal line is located near this non-conductive material, so that liquid level information can be transmitted to a remote location without any trouble.
（実施例） そこで以下に図示した実施例について説明する。(Example) Therefore, the illustrated embodiment will be explained below.
第５図は本発明が適用された給油設備の一例を示すもの
であって、図中符号１は地下タンク２に設けられた無線
式の液位測定装置で、この液位測定装置１は、地下タン
ク２から離れた位置（こある事務所８の受信装Ｍ９に検
出した液位を無線周波数の搬送波でもっで伝送するよう
に構成されでいる。FIG. 5 shows an example of refueling equipment to which the present invention is applied, and reference numeral 1 in the figure is a wireless liquid level measuring device installed in an underground tank 2, and this liquid level measuring device 1 includes: It is configured to transmit the detected liquid level to a receiver M9 in an office 8 located far from the underground tank 2 using a radio frequency carrier wave.
第１図、第２図はこの液位測定装置１の詳細な構造を示
したもので、この装Ｍ１は、地下タンク２の上部に埋設
した鉄製のマンホール３内に収められている。1 and 2 show the detailed structure of this liquid level measuring device 1, and this device M1 is housed in an iron manhole 3 buried in the upper part of an underground tank 2.
この液位測定装Ｍ１は、大別して地下タンク２からの立
上り管１０の上端に固定した取付は台１１と、この取付
は台］１上に取付１すた本体ベース１５と、後述する回
路部品とリチウム電池２５とを担持する電気ボックスベ
ース２０と、電気ボックスベース２ｏを気密に封止する
とともに機械的液位測定装置１５０を地下タンク２のフ
ロート５５に接続し得るよう担持する電気ボックスケー
ス３０と、電気ボックスヘース２ｏと電気ボックスケー
ス３０とを被覆し一体とした上、これらを本体ベース１
５上に取付ける本体ケース４０と１こよって構成されて
いる。This liquid level measuring device M1 is roughly divided into a base 11 fixed to the upper end of the riser pipe 10 from the underground tank 2, a main body base 15 mounted on the base 1, and circuit parts to be described later. and a lithium battery 25, and an electrical box case 30 that hermetically seals the electrical box base 2o and supports the mechanical liquid level measuring device 150 so that it can be connected to the float 55 of the underground tank 2. , the electrical box case 2o and the electrical box case 30 are covered and integrated, and then these are attached to the main body base 1.
5 and a main body case 40 attached on top of the main body case 40.
これらについてざらに詳しく説明すると、立上り管１ｏ
の上端に固定した取付は台１１には、その上面（こ設置
ブたＯリング１２を介して本体ベース１５の一半に設け
たテープ挿通孔１６部分がネジ１３により強固に取付け
られでいる。To explain these in detail, the riser pipe 1o
The tape insertion hole 16 provided in one half of the main body base 15 is firmly attached to the upper surface of the stand 11 by screws 13 via an O-ring 12.
一方、電気ボックスベース２０は、電気ボ・ンクスケー
ス３０によって気密に封止されるようその上面の外周縁
部とテープ挿通口周縛に○リング２１ａ、２１ｂが設け
られ、これらを介して電気ボックスケース３０の下端開
口部のフランジ３２部分と気密に接合されている。この
電気ボックスベース２ｏには、−半に本体ベース１５上
のテープ挿通孔１６と同じ位置にテープ挿通孔２２が設
けられ、また他生−側には、後述するテープリール５２
の回転を電気的信号に変換した上この信号を無線信号に
変換して出力させるための回路基板２４が設けられ、ざ
らに残る他側部分にはリチウム電池２５の収納部２６が
形成されている。On the other hand, the electrical box base 20 is provided with O-rings 21a and 21b around the outer periphery of the upper surface and around the tape insertion opening so that the electrical box base 20 is hermetically sealed by the electrical box case 30. It is hermetically joined to the flange 32 portion of the lower end opening of 30. This electrical box base 2o is provided with a tape insertion hole 22 at the same position as the tape insertion hole 16 on the main body base 15 on the other side, and a tape reel 52, which will be described later, is provided on the other side.
A circuit board 24 is provided for converting the rotation of the battery into an electrical signal and then converting this signal into a wireless signal and outputting it, and a storage portion 26 for a lithium battery 25 is formed in the other side that remains roughly. .
他方、この電気ボックスベース２０の上に、ネジ３１を
もって気密に被覆固定される電気ボックスケース３０に
は、その−半（こテープ挿通孔３４を有するテープドラ
ムユニット取付は面３５が形成され、また他生には、電
気ボックスベース２゜上の上記した回路基板２４とリチ
ウム電池２５を被覆するような形状をなすカバー３６が
一体的に形成されている。On the other hand, the electrical box case 30, which is airtightly covered and fixed onto the electrical box base 20 with screws 31, has a surface 35 formed thereon for mounting a tape drum unit having a tape insertion hole 34, and another A cover 36 is integrally formed to cover the circuit board 24 and lithium battery 25 on the electrical box base 2°.
５０は、地下タンク２内に収容した液のレベルを測定す
る機械的な液位測定装置で、この液位測定装Ｍ５０は、
テープドラム５２に巻回したテープ５３をテ・−プ挿通
孔３４．２２．１６と立上り管１０を通して地下タンク
２内に吊下することができるように、その支持ブラケッ
ト５１を上記した取付は面３５上に位置させている。こ
の支持ブラケット５１には、定トルクスプリング５９を
介して巻上げ方向の付勢力が作用するテープドラム５２
が軸支され、ここには、一端が地下タンク２内のフロー
ト５５（こ繋った目盛５４付きのテープ５３が巻回され
、電池２５が切れて送信が不能になったような場合でも
、本体ケース４０の頂面に設けた透明窓４５から目視に
よって液位を知ることができるように構成されでいる。Reference numeral 50 denotes a mechanical liquid level measuring device for measuring the level of liquid contained in the underground tank 2, and this liquid level measuring device M50 includes:
The support bracket 51 is mounted on the surface so that the tape 53 wound around the tape drum 52 can be suspended inside the underground tank 2 through the tape insertion hole 34.22.16 and the riser pipe 10. It is located above 35. This support bracket 51 is provided with a tape drum 52 on which a biasing force in the winding direction is applied via a constant torque spring 59.
A tape 53 with a scale 54 connected to a float 55 (one end of which is connected to the float 55 in the underground tank 2) is wound around it, so that even if the battery 25 runs out and transmission becomes impossible, The structure is such that the liquid level can be visually checked through a transparent window 45 provided on the top surface of the main body case 40.
また、この支持ブラケット５］には、その一部に地下タ
ンク２内の水を検知するための検知棒挿入孔５７が設け
られでおり、ざらにこの−側には、カバー３６の横孔３
７にＯリング６］をもつで策士に取付けられたポテンシ
ョメータ６０が位置しでいで、テープトラム５２の軸端
に固定したフェースギセ５６を介してこの回転を電気的
信号として取出すことができるように構成されでいる。In addition, a detection rod insertion hole 57 for detecting water in the underground tank 2 is provided in a part of the support bracket 5, and a horizontal hole 3 of the cover 36 is provided roughly on the - side.
A potentiometer 60 attached to the strategist with an O-ring 6 is located at 7, and the rotation is configured so that this rotation can be taken out as an electrical signal via a face hook 56 fixed to the shaft end of the tape tram 52. It's been done.
この電気ボックスケース３０を覆う本体ケース４０は、
表面を黒く塗った透明合成樹脂材により成形されでおり
、そのフランジ４１部分に設（すた孔４２から、電気ボ
ックスケース３０及び電気ボックスベース２０の番孔３
３．２３にネジ４３を挿通した上、本体ベース１５のネ
ジ孔１７に螺合することによってこれら全体を一体的に
固定するように構成されでいる。The main body case 40 that covers this electrical box case 30 is
It is molded from a transparent synthetic resin material whose surface is painted black, and is provided at the flange 41 (from the hole 42 to the hole 3 of the electrical box case 30 and the electrical box base 20).
The screws 43 are inserted through the holes 3 and 23, and then screwed into the screw holes 17 of the main body base 15, thereby fixing these as a whole integrally.
また図中符号２９は、回路基板２４上の送信回路と送信
アンテナ１４とを結ぶ可視性の同軸ケーブルで、このケ
ーブル２９は、電気ボックスベース２０の他端部に穿設
したケーブル挿通孔２７に同軸ケーブルバッキング２８
を介して気密に挿通されでいる。Reference numeral 29 in the figure is a visible coaxial cable that connects the transmitting circuit on the circuit board 24 and the transmitting antenna 14. coaxial cable backing 28
It is hermetically inserted through the .
なあ図中符号４４は本体ケース４ｏの頂面に設 ′１す
た水検知棒挿入口を覆う蓋、６５はポテンショメータ６
０の切欠き６２に挟み込んでその取付は取外しを容易に
するブラケットをそれぞれ示している。In the figure, reference numeral 44 is a lid installed on the top surface of the main body case 4o, and 65 is a lid that covers the water detection rod insertion slot.
Brackets are shown that are inserted into the notches 62 of 0 to facilitate their installation and removal.
ところで図中符号７は、本発明の特徴部分をなすマンホ
ール３の蓋で、この蓋７の一部には、蓋、７の上面と同
一平面となるよう上面をエポキシ樹脂のような非導電材
よりなる覆い７１によって覆われたポケット状の凹部７
２が形成されていで、蓋７の裏側に開口するよう凹部７
２の一端に設置すた挿入ロア３から送信アンテナ１４を
内部に挿入できるように構成されている。By the way, the reference numeral 7 in the figure is the cover of the manhole 3, which is a characteristic part of the present invention, and a part of the cover 7 is coated with a non-conductive material such as epoxy resin on the top surface so that it is flush with the top surface of the cover 7. A pocket-shaped recess 7 covered with a cover 71 made of
2 is formed, and a recess 7 is formed so as to open on the back side of the lid 7.
The transmitting antenna 14 is configured such that it can be inserted into the interior from an insertion lower 3 installed at one end of the antenna.
このように構成された無線式液位測定装置１は、はじめ
に電気ボックスベース２ｏと電気ボックスケース３０と
をネジ３１によって気ヱに結合した上、ざらにその上か
ら本体ケース４０を覆うことによって本体ベース１５上
に一体的に固定される。これにより、テープ挿通口３４
を通して電気ボックスケース３０と本体ケース４０との
間に引火性の強いガス侵入しでくるが、このガスは単に
機械式液位測定装置５０に触れるだけであって、電気ボ
ックスケース３０のカバー３６によって巧われた内部に
は引火性の強いガスやマンホール３内に溜った水等が侵
入しないため、カバー３６内に納められた回路部品と電
池２５は腐蝕したりスパークしたりする虞れもなく確実
に保護される。The wireless liquid level measuring device 1 configured as described above is constructed by first firmly connecting the electrical box base 2o and the electrical box case 30 with the screws 31, and then roughly covering the main body case 40 from above. It is integrally fixed on the base 15. As a result, the tape insertion port 34
Although highly flammable gas enters between the electrical box case 30 and the main body case 40 through Because highly flammable gas and water accumulated in the manhole 3 do not enter the well-designed interior, the circuit components and battery 25 housed within the cover 36 are securely protected from corrosion or sparks. protected.
そして、このように液位測定装置１をマンホール３内に
設置したあと、同軸ケーブル２９の先端に接続した送信
アンテナ１４を蓋７の裏側に開口した挿入ロア３から凹
部７２内に収め、最後にマンホール３の上部をこの蓋７
により覆う。After installing the liquid level measuring device 1 in the manhole 3 in this way, the transmitting antenna 14 connected to the tip of the coaxial cable 29 is inserted into the recess 72 through the insertion lower 3 opened on the back side of the lid 7, and finally Cover the top of manhole 3 with this cover 7.
covered by.
これによつ、液位測定装ＷＬ１が鉄製のマンホール３に
よってシールドされていでも、凹部７２内に位置する送
信アンテナ１４は、その上部を覆っている部材が非導電
材であるため、液位情報は離れた位置に設けた受信装置
９等へ支障なく伝送される。As a result, even if the liquid level measuring device WL1 is shielded by the iron manhole 3, the transmitting antenna 14 located in the recess 72 can receive liquid level information because the member covering the upper part thereof is made of a non-conductive material. is transmitted without any problem to the receiving device 9 or the like located at a remote location.
第３図に示した実施例は、Ｍ７の上面一部に凹所７５１
８設けてこの中に送信アンテナ１４をエポキシ樹脂７７
によって一体的に埋込んだもので、送信アンテナ１４に
接続した同軸ケーブル２９は、凹所７５の底面に設けた
孔７６を通して液位測定装置１の回路基板２４に直接接
続される。The embodiment shown in FIG. 3 has a recess 751 in a part of the upper surface of M7.
8 and place the transmitting antenna 14 in it using epoxy resin 77.
The coaxial cable 29 connected to the transmitting antenna 14 is directly connected to the circuit board 24 of the liquid level measuring device 1 through a hole 76 provided in the bottom of the recess 75.
この実施例においでは、防爆上の観点からコネクタを用
いることなく送信アンテナ１４と同軸ケーブル２９とを
接続させている関係上、装置１の取付は取外しに際しで
、装Ｍ］と蓋７は常に一体的に持運びされる。In this embodiment, since the transmitting antenna 14 and the coaxial cable 29 are connected without using a connector from an explosion-proof point of view, the device 1 is attached at the time of removal, and the housing M and the lid 7 are always integrated. be carried around.
また、第４図に示した本発明のざらに別の実施例は、送
信アンテナ１４８電気ボツクスケース３０のカバー３６
内に収容する一方、送信アンテナ］４と対向する蓋７の
部分には、非導電性の部材７８を嵌込むことによって、
電波を支障なく受信装Ｍ９等に伝送できるようにしたも
ので、この実施例の場合には、蓋７の全体を非導電材に
よって形成するようにしてもよい。Further, in a slightly different embodiment of the present invention shown in FIG.
By fitting a non-conductive member 78 into the part of the lid 7 facing the transmitting antenna 4,
This allows radio waves to be transmitted to the receiving device M9 etc. without any hindrance, and in the case of this embodiment, the entire lid 7 may be formed of a non-conductive material.
（効果）
以上述べたように本発明によれば、液位測定装置を収納
する収納容体の開口部を少なくとも一部を非導電材によ
り形成した蓋体により覆うとともに、ケース内の送信手
段に接続した送信アンテナをこの非導電材の近傍に位置
させるようにしたので、液位測定装置が鉄製の収納容体
によりシールドされた状態であっても、液位情報を遠隔
地に確実に伝送することができる。しかも可視性の信号
線を介してアンテナを接続しでいるので、防爆上の観点
からコネクタ等を使用しなくとも、装置の取付は取外し
に当ってはアンテナを蓋体の非導電材部分の近傍に自由
に位置させたり、あるいは装置と蓋とを一緒に持運ぶこ
とができるなど、装Ｈの取付け、取外しの作業を著しく
容易にすることができる。(Effects) As described above, according to the present invention, at least a portion of the opening of the storage container housing the liquid level measuring device is covered with a lid formed of a non-conductive material, and the opening is connected to the transmitting means in the case. Since the transmitting antenna is located near this non-conductive material, liquid level information can be reliably transmitted to remote locations even when the liquid level measuring device is shielded by a steel storage container. can. Moreover, since the antenna is connected via a visible signal line, there is no need to use a connector from an explosion-proof perspective. The work of attaching and detaching the device H can be greatly facilitated by being able to freely position the device and the lid, or carrying the device and the lid together.
第１図は本発明の一実施例を示す装置の分解斜視図、第
２図は同上装置の断面図、第３図及び第４図は本発明の
他の実施例を示す装置の要部断面図、第５図は同上装置
を備えた給油設備の一例を示す図である。
１・・・・無線式液位測定装置
１４・・・・送信アンテナ
２・・・・地下タンク ２４・・・・回路基板２
９・・・・同軸ケーブル ３・・・・マンホール３０
・・・・電気ボックスケース
４０・・・・本体ケース
５０・・・・機械式液位測定装置
７・・・・蓋体
７１・・・・非導電材よりなる覆い
７５・・・・凹所
７８・・・・非導電性部材FIG. 1 is an exploded perspective view of a device showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of the same device, and FIGS. 3 and 4 are cross-sections of essential parts of the device showing other embodiments of the present invention. FIG. 5 is a diagram showing an example of a refueling facility equipped with the above device. 1...Wireless liquid level measuring device 14...Transmission antenna 2...Underground tank 24...Circuit board 2
9... Coaxial cable 3... Manhole 30
... Electrical box case 40 ... Main body case 50 ... Mechanical liquid level measuring device 7 ... Lid body 71 ... Cover 75 made of non-conductive material ... Recess 78...Non-conductive member
Claims (1)
機電変換手段と、該電気的信号を無線信号に変換する送
信手段と、該送信手段及び電源電池を気密に収納するケ
ースとを備えた無線式液位測定装置において、該液位測
定装置を収納する収納容体の開口部を少なくとも一部を
非導電材により形成した蓋体により覆うとともに、可撓
性の信号線を介して上記送信手段に接続した送信アンテ
ナを上記非導電材の近傍に位置させたことを特徴とする
無線式液位測定装置。It is equipped with a mechano-electric conversion means for extracting the liquid level as an electrical signal from the mechanical liquid level measuring means, a transmitting means for converting the electrical signal into a wireless signal, and a case for airtightly housing the transmitting means and a power source battery. In the wireless liquid level measuring device, at least a portion of the opening of the storage container housing the liquid level measuring device is covered with a lid made of a non-conductive material, and the above-mentioned transmitting means is transmitted via a flexible signal line. A wireless liquid level measuring device characterized in that a transmitting antenna connected to the non-conductive material is located near the non-conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126296A JPH0629753B2 (en) | 1989-05-19 | 1989-05-19 | Wireless liquid level measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126296A JPH0629753B2 (en) | 1989-05-19 | 1989-05-19 | Wireless liquid level measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02306123A true JPH02306123A (en) | 1990-12-19 |
| JPH0629753B2 JPH0629753B2 (en) | 1994-04-20 |
Family
ID=14931696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1126296A Expired - Fee Related JPH0629753B2 (en) | 1989-05-19 | 1989-05-19 | Wireless liquid level measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0629753B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004253928A (en) * | 2003-02-18 | 2004-09-09 | Okamoto Co Ltd | Manhole iron cover for incorporating antenna |
| WO2021085625A1 (en) * | 2019-10-30 | 2021-05-06 | 古河電気工業株式会社 | Wireless communication structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5182474U (en) * | 1974-12-25 | 1976-07-01 | ||
| JPS595921A (en) * | 1982-11-02 | 1984-01-12 | Tokyo Tatsuno Co Ltd | Liquid quantity measuring apparatus |
| JPS59170287U (en) * | 1983-04-27 | 1984-11-14 | 株式会社京三製作所 | Geomagnetic vehicle detector |
| JPS61205027U (en) * | 1986-06-11 | 1986-12-24 |
-
1989
- 1989-05-19 JP JP1126296A patent/JPH0629753B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5182474U (en) * | 1974-12-25 | 1976-07-01 | ||
| JPS595921A (en) * | 1982-11-02 | 1984-01-12 | Tokyo Tatsuno Co Ltd | Liquid quantity measuring apparatus |
| JPS59170287U (en) * | 1983-04-27 | 1984-11-14 | 株式会社京三製作所 | Geomagnetic vehicle detector |
| JPS61205027U (en) * | 1986-06-11 | 1986-12-24 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004253928A (en) * | 2003-02-18 | 2004-09-09 | Okamoto Co Ltd | Manhole iron cover for incorporating antenna |
| WO2021085625A1 (en) * | 2019-10-30 | 2021-05-06 | 古河電気工業株式会社 | Wireless communication structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0629753B2 (en) | 1994-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2091551C (en) | Utility meter transponder/antenna assembly for underground installations | |
| US5825303A (en) | Sealed housing and method of sealing for apparatus in meter pit enclosures | |
| US6378817B1 (en) | Kit and method for mounting a transmitter in subsurface meter pits | |
| US5877703A (en) | Utility meter transmitter assembly for subsurface installations | |
| EP1866605B1 (en) | Inductive communications port for an automatic meter reading communication device | |
| US6490922B1 (en) | System for controlling the level of the liquid contained in a LPG tank or the like | |
| JPH02306123A (en) | Wireless liquid level measuring device | |
| JP2898294B2 (en) | Wireless liquid level measuring device | |
| JPH0368817A (en) | Radio-type liquid-level measuring apparatus | |
| US5761955A (en) | Removable ultrasonic transducer with integral electrical disconnect | |
| JPH03294996A (en) | Radio liquid level measuring instrument | |
| JP2904800B2 (en) | Wireless liquid level measuring device | |
| JP2552639B2 (en) | Wireless liquid level measuring device | |
| JP2845759B2 (en) | Lid antenna for measuring underground objects | |
| CN215657070U (en) | Vibration measurement system suitable for steel rolling production line | |
| CN220153680U (en) | Ultrasonic liquid level meter for measuring dynamic oscillation liquid level | |
| JPH0237102Y2 (en) | ||
| CN217240949U (en) | Wireless gateway device | |
| KR102314609B1 (en) | Antena Module Waterproof and Embed Structure for Smart Manhole Cover | |
| CN217061143U (en) | Buried vibration alarm device | |
| CN211236295U (en) | Metal detection system for archaeology work | |
| CN219204696U (en) | Intelligent well lid detection system | |
| CN218119189U (en) | Aviation meteorological collection system | |
| CN219157770U (en) | Well lid and well lid management system | |
| JPH0719927A (en) | Flowmeter with transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |