JPH0126497B2 - - Google Patents
Info
- Publication number
- JPH0126497B2 JPH0126497B2 JP16674481A JP16674481A JPH0126497B2 JP H0126497 B2 JPH0126497 B2 JP H0126497B2 JP 16674481 A JP16674481 A JP 16674481A JP 16674481 A JP16674481 A JP 16674481A JP H0126497 B2 JPH0126497 B2 JP H0126497B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- flow rate
- water leakage
- signal
- output
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Examining Or Testing Airtightness (AREA)
Description
【発明の詳細な説明】
本発明は水道管からの漏水を検出する目的で使
用する漏水検出器付き量水器の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water meter with a water leakage detector used for the purpose of detecting water leakage from water pipes.
近年、水道管のき裂、腐食、接手のゆるみ、不
良等が原因で発生する漏水を検出する目的に使用
するものとして、漏水検出機能を備えた量水器が
提案されている。つまり、この種の量水器は水道
管の漏水箇所から発生する高周波振動が水道水の
中を水の密度変化として伝播することから、量水
器中にその受圧部が水と接するように取付けられ
た圧力−電気変換器を用いて、漏水現象を電気信
号として取出すことにより漏水を検出するもので
ある。 In recent years, water meters with a water leak detection function have been proposed for use in detecting water leaks caused by cracks, corrosion, loose joints, defects, etc. in water pipes. In other words, this type of water meter is installed in the water meter so that its pressure-receiving part is in contact with the water, because high-frequency vibrations generated from water pipe leaks propagate through the tap water as changes in water density. Water leakage is detected by extracting the water leakage phenomenon as an electrical signal using a pressure-electrical converter.
特に、近年の量水器においては、量水器に内蔵
された圧力−電力電気変換器からの出力信号が、
ある一定値以上でかつ一定時間連続して検出され
た場合に漏水と判定することにより、水道水の使
用音、自動車の通過音、その他の断続的発生音
と、漏水音との判別を図るようにしている。 In particular, in recent water meters, the output signal from the pressure-to-power electrical converter built into the water meter is
By determining a water leak if it is detected at a certain value or higher and continuously for a certain period of time, it is possible to distinguish the sound of a water leak from the sound of tap water being used, the sound of a car passing by, or other intermittent sounds. I have to.
然乍ら、水道水の使用者はその量水器の需要家
側での長時間に亘る水道使用の場合においては、
圧力−電気変換器からの信号が“ある一定値以上
でかつ一定時間連続”という漏水判定の条件を常
に満たすことにより、量水器の需要家側での水道
水使用による使用音によつて、誤つた漏水判定を
してしまうという問題がある。 However, if the tap water user uses the water meter for a long time on the customer side,
By always meeting the conditions for water leakage determination that the signal from the pressure-to-electricity converter is ``a certain value or more and continuous for a certain period of time,'' the noise caused by the use of tap water on the consumer side of the water meter can be There is a problem in that water leakage is incorrectly determined.
本発明は上記のような問題を解決するために成
されたもので、その目的は需要家側での水道水の
使用に伴なう使用者による漏水検出の誤判定を防
止して確実な漏水検出を行なうことができる漏水
検出器を備えた量水器を提供することにある。 The present invention was made to solve the above-mentioned problems, and its purpose is to prevent erroneous water leakage detection by users when using tap water on the consumer side, and to ensure water leakage. An object of the present invention is to provide a water meter equipped with a water leakage detector capable of detecting water leakage.
本発明では上記目的を達成するために、水道管
からの漏水を検出する目的で圧力−電気信号変換
器を組込んだ漏水検出器付きの量水器において、
流量−電気信号変換器を付加して通過水道水の流
量を検出し、該実流量が量水器の需要家側での通
常使用水量の最低流量以上であることを条件に、
漏水判定を中断しようとするものである。 In order to achieve the above object, the present invention provides a water meter with a water leakage detector incorporating a pressure-electrical signal converter for the purpose of detecting water leakage from water pipes.
A flow rate-to-electrical signal converter is added to detect the flow rate of passing tap water, and on the condition that the actual flow rate is equal to or higher than the minimum flow rate of the amount of water normally used on the consumer side of the water meter,
This is an attempt to interrupt water leakage determination.
以下、本発明の一実施例について図面を参照し
て説明する。第１図ａ，ｂは、本発明による漏水
検出器付き量水器の構成例を側面図、平面図にて
示すものである。図において、１は指針または量
子化された指示値を表示する表示部である。２は
量水器入口で、ここから供給された水は計量部３
を通つて量水器出口４より需要家へ供給される。
また、５は漏水により発生する高周波振動（漏水
振動）を検出して電気信号に変換する圧力−電気
信号変換器としての水中マイクロホン、６はその
感圧部で上記量水器入口２の近傍に設置してい
る。７は水中マイクロホン５の出力信号を増幅す
る増幅器であり、上記水中マイクロホン５と増幅
器７より圧力−電気信号変換装置を構成してい
る。 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1a and 1b show a side view and a plan view of a configuration example of a water meter with a water leakage detector according to the present invention. In the figure, 1 is a display unit that displays a pointer or a quantized instruction value. 2 is the water meter inlet, and the water supplied from here is transferred to the metering section 3.
The water is supplied to consumers through the water meter outlet 4.
Further, 5 is an underwater microphone serving as a pressure-to-electrical signal converter that detects high-frequency vibrations (water leakage vibrations) generated by water leakage and converts it into an electric signal, and 6 is its pressure sensing part located near the water meter inlet 2. It is installed. Reference numeral 7 denotes an amplifier for amplifying the output signal of the underwater microphone 5, and the underwater microphone 5 and the amplifier 7 constitute a pressure-electrical signal converter.
一方、計量部３において９は量水器中を通過す
る水により回転する流量測定用の羽根車で、その
回転力を羽根車軸１０を介して上記表示部へ伝達
する。また、１１は上記表示部１に設けられ、羽
根車９よりの回転速度を流量信号として検出して
電気信号に変換する流量−電気信号変換器、１２
はこの流量−電気信号変換器１１の出力信号を増
幅する増幅器であり、これらより流量−電気信号
変換装置を構成している。さらに、８は上記圧力
−電気信号変換器５および増幅器７と、流量−電
気信号変換器１１および増幅器１２へその電源を
供給するための小形長寿命電池である。 On the other hand, in the metering section 3, reference numeral 9 denotes an impeller for measuring flow rate which is rotated by the water passing through the water meter, and its rotational force is transmitted to the display section via the impeller shaft 10. Further, reference numeral 11 is a flow rate-to-electrical signal converter 12 provided in the display unit 1, which detects the rotational speed of the impeller 9 as a flow rate signal and converts it into an electric signal.
is an amplifier that amplifies the output signal of this flow rate-electrical signal converter 11, and constitutes a flow rate-electrical signal converter. Furthermore, 8 is a small long-life battery for supplying power to the pressure-electrical signal converter 5 and amplifier 7, and the flow rate-electrical signal converter 11 and amplifier 12.
なお、図において１４は漏水検出出力を出力す
るための出力端子である。 In addition, in the figure, 14 is an output terminal for outputting a water leakage detection output.
第２図は、本発明による漏水検出器の構成例を
ブロツク的に示したものであり、第１図と同一部
分には同一符号を付して示している。図におい
て、２３は前記増幅器７の出力信号中より漏水振
動の周波数帯以外の低、高周波信号成分を除去す
るバンドパスフイルター、２４はこのバンドパス
フイルター２３からの出力信号のうち一定の大き
さ以上の信号のみを抽出する波高値弁別回路であ
る。また、２５は前記増幅器１２の出力信号と、
予め設定された量水器の需要家側での通常使用水
量の最低流量Q0とを比較する流量比較器で、実
流量が最低流量Q0以上である時にその比較出力
を漏水判定ロツク信号として送出するものであ
る。 FIG. 2 is a block diagram showing an example of the construction of a water leakage detector according to the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals. In the figure, 23 is a band pass filter that removes low and high frequency signal components other than the frequency band of water leakage vibration from the output signal of the amplifier 7, and 24 is a band pass filter that removes low and high frequency signal components other than the frequency band of water leakage vibration from the output signal of the amplifier 7, and 24 is a band pass filter that removes low and high frequency signal components other than the frequency band of water leakage vibration from the output signal of the amplifier 7. This is a peak value discrimination circuit that extracts only the signal. Further, 25 is the output signal of the amplifier 12,
This is a flow rate comparator that compares the preset minimum flow rate of water normally used on the consumer side of the water meter with the minimum flow rate Q0 , and when the actual flow rate is higher than the minimum flow rate Q0 , the comparison output is used as a water leakage judgment lock signal. It is something that is sent out.
一方、２６は上記波高値弁別回路２４、流量比
較器２５およびクロツクパルス発生回路２７から
の出力を基に漏水判定を行なう漏水判定回路で、
流量比較器２５からのロツク信号の印加がない場
合で、且つ波高値弁別回路２４よりの出力が一定
時間連続的に印加されたことを条件に漏水振動と
判定して漏水検出出力を送出するものである。さ
らに、２８はこの漏水判定回路２６よりの出力を
漏水検出結果として記憶する記憶回路、２９はそ
れを表示する表示部である。なお、記憶回路２８
および表示部２９は量水器外に設けてある。 On the other hand, 26 is a water leakage determination circuit that performs water leakage determination based on the outputs from the peak value discrimination circuit 24, the flow rate comparator 25, and the clock pulse generation circuit 27.
A device that determines water leak vibration and sends a water leak detection output when the lock signal from the flow rate comparator 25 is not applied and the output from the peak value discrimination circuit 24 is continuously applied for a certain period of time. It is. Further, 28 is a storage circuit that stores the output from the water leakage determination circuit 26 as a water leakage detection result, and 29 is a display section that displays it. Note that the memory circuit 28
The display section 29 is provided outside the water meter.
第３図は、上記漏水検出器を組み込んだ量水器
の具体的な配置構成例を示したものである。図に
おいて、配水管１６から分水栓１７によつて給水
管１８を分岐し、さらにこの給水管１８を止水栓
１９を介して量水器１３に接続する。ここで、量
水器１３には前記圧力−電気信号変換器５および
増幅器７と、流量−電気信号変換器１１および増
幅器１２と、小形長寿命電池８と、バンドパスフ
イルター２３と、波高値弁別回路２４と、流量比
較器２５と、漏水判定回路２６と、クロツクパル
ス発生回路２７とから成る漏水検出器を組み込ん
で、量水器と一体化構成している。なお、第２
図、第３図において１４，１４Ａ，１５は夫々出
力端子で、漏水検出出力の記録や伝送用として使
用するものであり、テレメータシステムによる集
中監視制御が可能である。 FIG. 3 shows a specific example of the arrangement of a water meter incorporating the water leakage detector described above. In the figure, a water supply pipe 18 is branched from a water distribution pipe 16 by a water distribution valve 17, and this water supply pipe 18 is further connected to a water meter 13 via a water stop valve 19. Here, the water meter 13 includes the pressure-electrical signal converter 5 and the amplifier 7, the flow rate-electrical signal converter 11 and the amplifier 12, the small long-life battery 8, the bandpass filter 23, and the peak value discriminator. A water leakage detector consisting of a circuit 24, a flow rate comparator 25, a water leakage determination circuit 26, and a clock pulse generation circuit 27 is incorporated to form an integrated structure with the water meter. In addition, the second
3, 14, 14A, and 15 are output terminals, respectively, which are used for recording and transmitting water leakage detection output, and central monitoring and control by a telemeter system is possible.
かかる如く構成した量水器において、今量水器
入口２に水が供給されると、羽根車９が回転して
その回転力が羽根車軸１０を介して表示部１に与
えられる。表示部１では、羽根車９よりの機械的
な流量信号（回転力）を積算して流量積算値を表
示する。一方、水道水中を伝播してくるあらゆる
振動は圧力−電気信号変換器５にて電気信号に変
換され、これより増幅器７で増幅してバンドパス
フイルター２３に印加される。すると、このバン
ドパスフイルター２３において、漏水振動の周波
数帯以外の低周波、高周波信号成分が除去され、
後段の波高値弁別回路２４で一定の大きさ以上の
信号のみを抽出して漏水判定回路２６に入力され
る。 In the water meter configured as described above, when water is supplied to the water meter inlet 2, the impeller 9 rotates and its rotational force is applied to the display section 1 via the impeller shaft 10. The display unit 1 integrates the mechanical flow signal (rotational force) from the impeller 9 and displays the integrated flow value. On the other hand, any vibrations propagating through the tap water are converted into electrical signals by the pressure-to-electrical signal converter 5, amplified by the amplifier 7, and applied to the bandpass filter 23. Then, in this bandpass filter 23, low frequency and high frequency signal components other than the frequency band of water leakage vibration are removed,
A wave height value discrimination circuit 24 in the subsequent stage extracts only signals having a certain magnitude or more and inputs them to a water leakage determination circuit 26.
また、一方においては上記羽根車９よりの回転
速度を検出して流量信号とする流量−電気信号変
換器１１により、本量水器を通過する水道水の流
量を検出して電気信号に変換され、これより増幅
器１２で増幅して流量比較器２５に印加される。
すると、この流量比較器２５において該実流量信
号が、量水器の需要家側での通常使用水量の最低
流量Q0と比較され、実流量信号が最低流量Q0以
上である時には、その比較出力が漏水判定ロツク
信号として漏水判定回路２６に入力される。これ
により、漏水判定回路２６においては漏水判定を
行ない、流量比較器２５よりのロツク信号の入力
がない場合で、且つ波高値弁別回路２４よりの出
力が一定時間（クロツクパルス出力）連続的に印
加されたことを条件に、漏水振動と判定して漏水
検出出力が送出され、漏水判定結果を記憶回路２
８に記憶すると共に表示部２９に表示が成され
る。 On the other hand, a flow rate-to-electrical signal converter 11 detects the rotation speed of the impeller 9 and converts it into a flow rate signal, which detects the flow rate of tap water passing through the main water meter and converts it into an electric signal. , this is amplified by the amplifier 12 and applied to the flow rate comparator 25.
Then, in this flow rate comparator 25, the actual flow rate signal is compared with the minimum flow rate Q 0 of the normal water usage on the consumer side of the water meter, and when the actual flow rate signal is equal to or higher than the minimum flow rate Q 0 , the comparison is The output is input to the water leakage determination circuit 26 as a water leakage determination lock signal. As a result, the water leakage judgment circuit 26 performs water leakage judgment, and when the lock signal from the flow rate comparator 25 is not input, and the output from the peak value discrimination circuit 24 is continuously applied for a certain period of time (clock pulse output). On the condition that the water leakage vibration occurs, a water leakage detection output is sent out, and the water leakage judgment result is stored in the storage circuit 2.
8 and displayed on the display unit 29.
すなわち、漏水振動の場合には上記流量比較器
２５からはロツク信号が送出されないが、水道水
の使用による振動等の場合にはロツク信号が送出
されるため、漏水音と、水道水の使用音、その他
の断続的発生音とを明確に判別することができる
ものである。 That is, in the case of water leakage vibration, the flow rate comparator 25 does not send out a lock signal, but in the case of vibration due to the use of tap water, a lock signal is sent out, so that the sound of water leakage and the sound of tap water being used are , and other intermittent sounds can be clearly distinguished from each other.
このように、水道管からの漏水を検出する目的
で、圧力−電気信号変換器５と、この変換器５の
出力を増幅する増幅器７と、バンドパスフイルタ
ー２３を介して入力される増幅器７の出力信号中
一定値以上の信号を弁別する波高値弁別回路２４
と、この波高値弁別回路２４の出力が一定時間連
続して印加されたことを判定して漏水検出出力を
送出する漏水判定回路２６とより成る漏水検出器
を備えた量水器において、量水器を通過する水道
水の流量を検出して電気信号に変換する流量−電
気信号変換器１１と、この変換器１１の出力を増
幅する増幅器１２と、この増幅器１２の出力（実
流量）と予め設定された量水器の需要家側での通
常使用水量の最低流量Q0とを比較する流量比較
器２５とを付加し、実流量が最低流量Q0以上で
あることを条件に、漏水判定回路２６における漏
水判定をロツクするように構成したものである。 In this way, for the purpose of detecting water leakage from water pipes, the pressure-to-electrical signal converter 5, the amplifier 7 that amplifies the output of this converter 5, and the amplifier 7 input via the bandpass filter 23 are used. A peak value discrimination circuit 24 that discriminates signals of a certain value or more among output signals.
In a water meter equipped with a water leakage detector consisting of a water leakage detection circuit 26 that determines that the output of the peak value discrimination circuit 24 has been continuously applied for a certain period of time and sends out a water leakage detection output, A flow rate-electrical signal converter 11 that detects the flow rate of tap water passing through the device and converts it into an electric signal, an amplifier 12 that amplifies the output of this converter 11, and an output (actual flow rate) of this amplifier 12 and a A flow rate comparator 25 is added to compare the set water meter with the minimum flow rate Q 0 of the normal water usage on the consumer side, and water leakage is determined on the condition that the actual flow rate is greater than or equal to the minimum flow rate Q 0 . The structure is such that water leakage determination in the circuit 26 is locked.
従つて、量水器の需要家側での水道水使用によ
る使用音での漏水検出の誤判定を防止して、極め
て信頼性の高い漏水検出を確実に行なうことが可
能となる。また、かかる漏水検出器を量水器に内
蔵して一体化構成として設けているので、簡単な
構成にて確実な漏水検出を行なうことができる。 Therefore, it is possible to prevent an erroneous determination of water leakage detection due to the sound of tap water being used on the consumer side of the water meter, and to ensure extremely reliable water leakage detection. Further, since the water leakage detector is built into the water meter and provided as an integrated structure, reliable water leakage detection can be performed with a simple structure.
尚、上記実施例における圧力−電気信号変換器
とその増幅器と、流量−電気信号変換器とその増
幅器とのみを量水器内に設け、漏水判定を外部装
置を使用して行なうようにすれば、量水器をより
一層コンパクトなものとすることができる。 Incidentally, if only the pressure-electrical signal converter and its amplifier and the flow rate-electrical signal converter and its amplifier in the above embodiment are installed in the water meter, and water leakage determination is performed using an external device. , the water meter can be made even more compact.
その他、本発明はその要旨を変更しない範囲
で、種々に変形して実施することができるもので
ある。 In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.
以上説明したように本発明によれば、通過水道
水の実流量が需要家側での通常使用水量の最低流
量以上である場合に漏水判定を中断するようにし
たので、需要家側での水道水の使用に伴なう使用
音による漏水検出の誤判定を防止して確実な漏水
検出を行なうことができる極めて信頼性の高い量
水器が提供できる。 As explained above, according to the present invention, water leakage determination is interrupted when the actual flow rate of passing tap water is equal to or higher than the minimum flow rate of the normal water usage on the customer side. It is possible to provide an extremely reliable water meter that can prevent erroneous determination of water leakage detection due to the noise that accompanies the use of water and can perform reliable water leakage detection.
第１図ａ，ｂは本発明の一実施例を示す構成
図、第２図は漏水検出器を示すブロツク図、第３
図は量水器の具体的な配置例を示す構成図であ
る。
１，２９……表示部、５……圧力−電気信号変
換器、６……感圧部、７，１２……増幅器、８…
…小形長寿命電池、９……羽根車、１１……流量
−電気信号変換器、１３……量水器、１４，１４
Ａ，１５……出力端子、１６……配水管、１８…
…給水管、２３……バンドパスフイルタ、２４…
…波高値弁別回路、２５……流量比較器、２６…
…漏水判定回路、２７……クロツクパルス発生回
路、２８……記憶回路。
Figures 1a and b are block diagrams showing one embodiment of the present invention, Figure 2 is a block diagram showing a water leak detector, and Figure 3 is a block diagram showing an embodiment of the present invention.
The figure is a configuration diagram showing a specific example of arrangement of water meters. 1, 29...Display section, 5...Pressure-electrical signal converter, 6...Pressure sensing section, 7, 12...Amplifier, 8...
... Compact long-life battery, 9 ... Impeller, 11 ... Flow rate-electrical signal converter, 13 ... Water meter, 14, 14
A, 15...Output terminal, 16...Water pipe, 18...
... Water supply pipe, 23 ... Bandpass filter, 24 ...
... Peak value discrimination circuit, 25 ... Flow rate comparator, 26 ...
...Water leakage determination circuit, 27...Clock pulse generation circuit, 28...Memory circuit.
Claims (1)
流量信号として表示部へ伝達する流量測定用の羽
根車を有する計量部と、前記管内を通過する水中
の振動を検出して電気信号に変換し且つ該信号が
一定値以上の状態を一定時間連続的に検出した時
に漏水と判定して漏水検出出力を送出する漏水検
出器と、前記管内を通過する水の流量を検出して
電気信号に変換し且つ該信号（実流量）が需要家
側での通常使用水量の最低流量の大きさ以上であ
ることを検出したことを条件に前記漏水判定を阻
止する漏水判定ロツク出力を送出する漏水判定ロ
ツク回路とを具備したことを特徴とする量水器。1. A metering section that has an impeller for measuring flow rate that is rotated by the water passing through the pipe and transmits the rotational force to the display section as a flow rate signal, and a metering section that detects vibrations in the water passing through the pipe and converts them into electrical signals. and a water leak detector that determines a water leak and sends out a water leak detection output when the signal continuously detects a certain value or more for a certain period of time, and a water leak detector that detects the flow rate of water passing through the pipe and converts it into an electrical signal. and a water leakage judgment lock that sends a water leakage judgment lock output that blocks the water leakage judgment on the condition that the signal (actual flow rate) is detected to be greater than or equal to the minimum flow rate of the normal water consumption on the consumer side. A water meter characterized by comprising a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16674481A JPS5866816A (en) | 1981-10-19 | 1981-10-19 | Water meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16674481A JPS5866816A (en) | 1981-10-19 | 1981-10-19 | Water meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5866816A JPS5866816A (en) | 1983-04-21 |
| JPH0126497B2 true JPH0126497B2 (en) | 1989-05-24 |
Family
ID=15836939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16674481A Granted JPS5866816A (en) | 1981-10-19 | 1981-10-19 | Water meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5866816A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6449928A (en) * | 1987-08-20 | 1989-02-27 | Matsushita Electric Ind Co Ltd | Water leak detecting device |
| JPS6449927A (en) * | 1987-08-20 | 1989-02-27 | Matsushita Electric Ind Co Ltd | Water leak detecting device |
| JPH0631402Y2 (en) * | 1988-12-29 | 1994-08-22 | 西部瓦斯株式会社 | Gas leak inspection device |
| JPH03287040A (en) * | 1990-04-03 | 1991-12-17 | Matsushita Electric Ind Co Ltd | Leak detecting device |
| EP2107357A1 (en) | 2008-04-03 | 2009-10-07 | HERA S.p.A. | Method for detecting the presence of leaks in a water distribution network and kit for applying the method |
-
1981
- 1981-10-19 JP JP16674481A patent/JPS5866816A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5866816A (en) | 1983-04-21 |
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