JPH0926347A - Wireless liquid level measurement and transmission device - Google Patents
Wireless liquid level measurement and transmission deviceInfo
- Publication number
- JPH0926347A JPH0926347A JP7199199A JP19919995A JPH0926347A JP H0926347 A JPH0926347 A JP H0926347A JP 7199199 A JP7199199 A JP 7199199A JP 19919995 A JP19919995 A JP 19919995A JP H0926347 A JPH0926347 A JP H0926347A
- Authority
- JP
- Japan
- Prior art keywords
- measurement
- interval
- displacement
- value
- measuring
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、給油所等に埋設されて
いる地下タンクの燃料油の液位を測定し、測定した液位
を無線によって送信する無線式液位測定送信装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless liquid level measuring and transmitting device for measuring the liquid level of fuel oil in an underground tank buried in a gas station and transmitting the measured liquid level wirelessly. is there.
【０００２】[0002]
【従来の技術】一般に、給油所では、地下タンクから離
れた事務所内で、地下タンクの液位を監視できるように
している。ここで、地下タンクに設けた計測手段からの
信号を、ケーブルで伝送しようとすると、防爆対策上、
配線工事が大がかりなものになる。そのため、従来よ
り、計測手段にバッテリーを設け、測定値を無線で事務
所に送信している。2. Description of the Related Art Generally, at a gas station, the liquid level of an underground tank can be monitored in an office away from the underground tank. Here, if you try to transmit the signal from the measuring means installed in the underground tank with a cable,
Wiring work becomes large-scale. Therefore, conventionally, a battery is provided in the measuring means and the measured value is wirelessly transmitted to the office.
【０００３】こうしたシステムでは、バッテリーが切れ
ると、バッテリー交換をするのであるが、防爆対策上、
給油所の作業者ではなく、別のサービスマンがバッテリ
ーの交換を行う。したがって、１回のバッテリー交換の
コストが高いので、極力、バッテリーの寿命を伸ばす工
夫が必要となる。そこで、従来は、計測手段の測定結果
に基づいて送信の間隔を調節することにより、省電力化
を図っている（たとえば、特公平６−６３８１０号公
報、特開平４−５８１１６号公報、同３３１３２６号公
報参照）。In such a system, when the battery runs out, the battery is replaced.
Another service person replaces the battery, not the operator at the gas station. Therefore, since the cost of one battery replacement is high, it is necessary to devise to extend the life of the battery as much as possible. Therefore, conventionally, power saving is achieved by adjusting the transmission interval based on the measurement result of the measuring means (for example, Japanese Patent Publication No. 6-63810, Japanese Patent Application Laid-Open No. 4-58116, and Japanese Patent No. 331326). (See the official gazette).
【０００４】[0004]
【発明が解決しようとする課題】しかし、これらの先行
技術では、送信時の省電力化を図ることはできるが、測
定時の省電力化については何ら考慮されていない。した
がって、今一つ十分にバッテリーの寿命を伸ばすことが
できない。However, in these prior arts, although power saving during transmission can be achieved, no consideration is given to power saving during measurement. Therefore, the life of the battery cannot be fully extended.
【０００５】本発明は、前記従来の課題に鑑みてなされ
たもので、その目的は、送信時だけでなく、測定時につ
いても省電力化を図ってバッテリーの寿命を十分に伸ば
すことができる無線式液位測定送信装置を提供すること
である。The present invention has been made in view of the above problems of the related art, and its purpose is to save power not only at the time of transmission but also at the time of measurement, so that the battery life can be sufficiently extended. A liquid level measuring and transmitting device is provided.
【０００６】[0006]
【課題を解決するための手段および作用】前記目的を達
成するために、本出願の第１発明は、今回の測定値Ｈ0
と今回よりも前の測定値Ｈm とを比較する比較手段と、
短い測定間隔ＴS および長い測定間隔ＴL の少なくとも
２種類の測定間隔で計測手段に測定させると共に、前記
比較手段による比較結果に基づいて、次回以後（次回を
含む）の測定間隔を制御する測定間隔制御手段とを備え
ていることを特徴とする。Means and Actions for Solving the Problems In order to achieve the above-mentioned object, the first invention of the present application is based on the present measurement value H 0.
And a comparison means for comparing the measured value H m before this time,
Measurement in which the measuring means measures at least two kinds of measuring intervals of a short measuring interval T S and a long measuring interval T L , and controls the measuring interval of the next time (including the next time) based on the comparison result by the comparing means. And an interval control means.
【０００７】第１発明によれば、比較手段による比較の
結果、液位が上昇しているか、安定しているか、あるい
は、下降しているかを知ることができるので、たとえ
ば、液位が上昇している場合に短い測定間隔ＴS で測定
し、一方、安定・下降中には長い測定間隔ＴL で測定す
ることができる。ここで、液位が上昇するのは、ローリ
ーから荷降し注油を行うような、極く短い期間であるか
ら、測定時の省電力化を図ることができる。According to the first aspect of the present invention, it is possible to know whether the liquid level is rising, stable, or falling as a result of the comparison by the comparing means. Therefore, for example, the liquid level is rising. In this case, the measurement can be performed at a short measurement interval T S , while the measurement can be performed at a long measurement interval T L during the stable / descent. Here, since the liquid level rises for an extremely short period, such as when unloading from a lorry and performing lubrication, it is possible to save power during measurement.
【０００８】第１発明は、次の第２発明により、より具
体的に実現される。第２発明は、測定間隔基準変位ΔＰ
１を記憶する記憶部と、今回の測定値Ｈ0から今回より
も前の測定値Ｈm を減算した変位ΔＨ0 を、前記測定間
隔基準変位ΔＰ１と比較する比較手段と、短い測定間隔
ＴS および長い測定間隔ＴL の少なくとも２種類の測定
間隔で前記計測手段に測定させると共に、前記比較手段
による比較の結果、前記変位ΔＨ0 が測定間隔基準変位
ΔＰ１よりも大きいときには、次回の測定までの測定間
隔を前記短い測定間隔ＴS で測定させる測定間隔制御手
段とを備えていることを特徴とする。The first invention is more specifically realized by the following second invention. The second invention is the measurement interval reference displacement ΔP.
1 and a comparing means for comparing the displacement ΔH 0 obtained by subtracting the measurement value H m before this time from the measurement value H 0 at this time with the measurement interval reference displacement ΔP 1; and the short measurement interval T S. And at least two measurement intervals of a long measurement interval TL, the measuring means is caused to measure, and when the displacement ΔH 0 is larger than the measurement interval reference displacement ΔP1 as a result of comparison by the comparing means, until the next measurement. And a measuring interval control means for measuring the measuring interval at the short measuring interval T S.
【０００９】[0009]
【実施例】以下、本発明の一実施例を図面にしたがって
説明する。図１において、給油所の地下には、複数の地
下タンク１が埋設されており、一方、地上の事務所には
監視装置２が設置されている。各地下タンク１には、地
上に開口するピット１０が設けられていると共に、この
ピット１０の開口は蓋１１で閉塞されている。各ピット
１０内には、無線式液位測定送信装置３が収納されてい
る。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a plurality of underground tanks 1 are buried underground in a gas station, while a monitoring device 2 is installed in an office on the ground. Each underground tank 1 is provided with a pit 10 that opens to the ground, and the opening of this pit 10 is closed by a lid 11. A wireless liquid level measurement / transmission device 3 is housed in each pit 10.
【００１０】図２において、無線式液位測定送信装置３
は、計測手段３０、送信手段３１および制御手段４を備
えている。制御手段４には、バッテリー３２から電力が
供給されており、この制御手段４は計測スイッチ３３お
よび送信スイッチ３４をＯＮ・ＯＦＦさせることによ
り、後述するように、計測手段３０および送信手段３１
の動作を制御する。In FIG. 2, a wireless liquid level measuring and transmitting device 3 is provided.
Includes a measuring unit 30, a transmitting unit 31, and a controlling unit 4. Electric power is supplied to the control means 4 from the battery 32, and the control means 4 turns on and off the measurement switch 33 and the transmission switch 34, so that the measurement means 30 and the transmission means 31 will be described later.
Control the operation of.
【００１１】図３は計測手段３０の一例を示す。計測手
段３０は、地下タンク１（図１）内の燃料油の液位が変
動するのに伴って上下動するフロート３０ａと、このフ
ロート３０ａにワイヤ３０ｂを介して接続されたポテン
ショメータ３０ｃを備えている。このポテンショメータ
３０ｃは、液位に応じた電圧を電圧周波数変換手段３０
ｄに出力する。この電圧周波数変換手段３０ｄは、変換
した周波数信号を周波数認識手段３０ｅに出力する。周
波数認識手段３０ｅは、認識した周波数を測定値（液
位）Ｈとして、図２の制御手段４に出力する。無線式液
位測定送信装置３の送信手段３１は、後述するように測
定値Ｈを監視装置２に無線で送信する。なお、送信する
電波の周波数は、地下タンク１ごとに異なっている。FIG. 3 shows an example of the measuring means 30. The measuring means 30 includes a float 30a that moves up and down as the liquid level of fuel oil in the underground tank 1 (FIG. 1) fluctuates, and a potentiometer 30c connected to the float 30a via a wire 30b. There is. This potentiometer 30c uses a voltage frequency conversion means 30 for converting a voltage corresponding to the liquid level.
Output to d. The voltage frequency conversion means 30d outputs the converted frequency signal to the frequency recognition means 30e. The frequency recognition means 30e outputs the recognized frequency as a measured value (liquid level) H to the control means 4 in FIG. The transmitting means 31 of the wireless liquid level measurement transmitting device 3 wirelessly transmits the measured value H to the monitoring device 2 as described later. The frequency of the radio wave to be transmitted differs for each underground tank 1.
【００１２】図４は監視装置２の一例を示す。監視装置
２は、送信手段３１（図２）からの無線信号を受信する
無線受信手段２０と、受信した測定値（液位）Ｈを残油
量に換算する液位／量換算手段２１と、残油量を表示す
る表示手段２２とを備えている。なお、警報手段２３
は、オーバーフローするおそれがある場合や残油量が所
定値よりも少ない場合に警報を発するものである。FIG. 4 shows an example of the monitoring device 2. The monitoring device 2 includes a wireless reception unit 20 that receives a wireless signal from the transmission unit 31 (FIG. 2), a liquid level / volume conversion unit 21 that converts the received measurement value (liquid level) H into a residual oil amount, A display unit 22 for displaying the amount of residual oil is provided. The alarm means 23
Gives an alarm when there is a risk of overflow or when the amount of residual oil is less than a predetermined value.
【００１３】つぎに、本発明の要部である図５の制御手
段４について説明する。この図において、制御手段４
は、たとえばマイクロコンピュータで構成されており、
記憶部４０を備えている。この記憶部４０には、以下の
値が予め設定記憶されている。 ΔＰ１：測定間隔第１基準変位 ΔＰ２：測定間隔第２基準変位 ΔＰ：正の送信基準変位 ΔＮ：負の送信基準変位 また、記憶部４０には、以下の値が更新記憶される。 Ｈ0 ：今回の測定値 Ｈ1 ：前回の測定値 ｈ：送信値Next, the control means 4 shown in FIG. 5, which is an essential part of the present invention, will be described. In this figure, the control means 4
Is composed of, for example, a microcomputer,
The storage unit 40 is provided. The following values are preset and stored in the storage unit 40. ΔP1: Measurement interval first reference displacement ΔP2: Measurement interval second reference displacement ΔP: Positive transmission reference displacement ΔN: Negative transmission reference displacement Further, the storage unit 40 updates and stores the following values. H 0 : Current measurement value H 1 : Previous measurement value h: Transmission value
【００１４】制御手段４は、第１ないし第３比較手段４
１〜４３、継続上昇液位安定判別手段４４、測定間隔制
御手段４５および送信間隔制御手段４６などを備えてい
る。測定間隔制御手段４５は、後述するように、第１比
較手段４１，第２比較手段４２による比較結果および継
続上昇液位安定判別手段４４の判別結果に基づいて、次
回および次回よりも後の測定間隔を制御するものであ
る。一方、送信間隔制御手段４６は３つの比較手段４１
〜４３による比較結果および継続上昇液位安定判別手段
４４の判別結果に基づいて、次の送信までの間隔を制御
するものである。The control means 4 comprises first to third comparing means 4
1 to 43, continuous rising liquid level stability determination means 44, measurement interval control means 45, transmission interval control means 46 and the like. As will be described later, the measurement interval control means 45 measures the next time and after the next time based on the comparison result by the first comparison means 41 and the second comparison means 42 and the determination result by the continuous rising liquid level stability determination means 44. It controls the interval. On the other hand, the transmission interval control means 46 has three comparison means 41.
The interval until the next transmission is controlled on the basis of the comparison result of ~ 43 and the determination result of the continuous rising liquid level stability determining means 44.
【００１５】第１比較手段４１は、今回の測定値Ｈ0 か
ら前回の測定値Ｈ1 を減算した短期変位ΔＨ0 を算出
し、この短期変位ΔＨ0 と測定間隔第１基準変位ΔＰ１
とを比較し、短期変位ΔＨ0 が測定間隔第１基準変位Δ
Ｐ１よりも大きいときに、短周期信号ｔｓを測定間隔制
御手段４５に出力する。一方、この第１比較手段４１
は、短期変位ΔＨ0 が測定間隔第１基準変位ΔＰ１以下
のときには、長周期信号ｔ１を測定間隔制御手段４５に
出力する。[0015] The first comparing means 41 calculates the short-term displacement [Delta] H 0 obtained by subtracting the measured value H 1 of the previous from the current measurement value H 0, the short-term displacement [Delta] H 0 and the measuring interval a first reference displacement ΔP1
The short-term displacement ΔH 0 is compared with the measurement interval first reference displacement Δ
When it is larger than P1, the short cycle signal ts is output to the measurement interval control means 45. On the other hand, this first comparison means 41
Outputs a long cycle signal t1 to the measurement interval control means 45 when the short-term displacement ΔH 0 is less than or equal to the measurement interval first reference displacement ΔP1.
【００１６】第２比較手段４２は、今回の測定値Ｈ0 か
ら、前回送信した前回送信値ｈ1 を減算した測定送信間
変位Δｈ0 を算出し、この測定送信間変位Δｈ0 と測定
間隔第２基準変位ΔＰ２とを比較し、測定送信間変位Δ
ｈ0 が測定間隔第２基準変位ΔＰ２よりも大きいとき
に、短周期信号ｔｓを測定間隔制御手段４５に出力す
る。一方、この第２比較手段４２は、測定送信間変位Δ
ｈ0 が測定間隔第２基準変位ΔＰ２以下のときには、長
周期信号ｔ１を測定間隔制御手段４５に出力する。な
お、前記測定間隔第２基準変位ΔＰ２は、測定間隔第１
基準変位ΔＰ１よりも大きな値に設定されている。The second comparing means 42 calculates a displacement Δh 0 between measurement transmissions obtained by subtracting the previously transmitted value h 1 transmitted last time from the measured value H 0 this time, and the displacement Δh 0 between measurement transmissions and the measurement interval 2 Reference displacement ΔP2 is compared and displacement between measurement transmissions Δ
When h 0 is larger than the second measurement interval reference displacement ΔP2, the short cycle signal ts is output to the measurement interval control means 45. On the other hand, the second comparison means 42 measures the displacement Δ between measurement transmissions.
When h 0 is equal to or less than the second measurement interval reference displacement ΔP2, the long cycle signal t1 is output to the measurement interval control means 45. The second reference displacement ΔP2 of the measurement interval is the first measurement interval
It is set to a value larger than the reference displacement ΔP1.
【００１７】前記第１比較手段４１は、短期変位ΔＨ0
が測定間隔第１基準変位ΔＰ１よりも大きいときに、短
周期信号ｔｓを継続上昇液位安定判別手段４４にも出力
し、一方、短期変位ΔＨ0 が測定間隔第１基準変位ΔＰ
１以下のときに、長周期信号ｔ１を継続上昇液位安定判
別手段４４にも出力する。継続上昇液位安定判別手段４
４は、短周期信号ｔｓおよび長周期信号ｔ１に基づい
て、液位が継続的に上昇しているか、あるいは、液位が
安定しているかを判断するものである。たとえば、継続
上昇液位安定判別手段４４は、カウンタを備えており、
第１比較手段４１から連続して短周期信号ｔｓが入力さ
れた場合は、液位が継続的に上昇していると判断し、そ
れ以後、液位が安定するまで測定間隔制御手段４５に短
周期信号ｔｓを出力する。一方、継続上昇液位安定判別
手段４４は、第１比較手段４１から数回連続して長周期
信号ｔ１が入力された場合は、液位が安定したと判断し
て、短周期信号ｔｓの出力を停止して測定間隔制御手段
４５に長周期信号ｔ１を出力する。The first comparing means 41 has a short-term displacement ΔH 0.
Is larger than the measurement interval first reference displacement ΔP1, the short cycle signal ts is also output to the continuous rising liquid level stability determination means 44, while the short-term displacement ΔH 0 is the measurement interval first reference displacement ΔP1.
When it is 1 or less, the long-period signal t1 is also output to the continuously rising liquid level stability determination means 44. Continuous rising liquid level stability determination means 4
4 determines whether the liquid level continuously rises or is stable based on the short cycle signal ts and the long cycle signal t1. For example, the continuous rising liquid level stability determination means 44 includes a counter,
When the short cycle signal ts is continuously input from the first comparison means 41, it is determined that the liquid level is continuously rising, and thereafter, the measurement interval control means 45 is short-circuited until the liquid level stabilizes. The periodic signal ts is output. On the other hand, the continuous rising liquid level stability determining means 44 determines that the liquid level is stable and outputs the short cycle signal ts when the long cycle signal t1 is continuously input from the first comparing means 41 several times. Then, the long cycle signal t1 is output to the measurement interval control means 45.
【００１８】測定間隔制御手段４５は、短い測定間隔Ｔ
S および長い測定間隔ＴL の２種類の測定間隔で計測手
段３０に測定をさせるもので、第１比較手段４１，第２
比較手段４２および継続上昇液位安定判別手段４４のい
ずれか１つから短周期信号ｔｓが入力されたときにタイ
マ６１の設定時間Ｔをたとえば２秒に設定し、一方、短
周期信号ｔｓが入力されない場合にはタイマ６１の設定
時間をたとえば５秒に設定する。タイマ６１は、設定時
間Ｔに応じて、計測スイッチ３３を２秒または５秒ごと
に閉成させて、バッテリー３２の電力を計測手段３０に
供給させる。これにより、計測手段３０は、２秒または
５秒ごとに１回の計測を行って測定値Ｈを制御手段４に
出力する。The measurement interval control means 45 has a short measurement interval T.
The measuring means 30 is made to measure at two types of measuring intervals, S and a long measuring interval T L.
When the short cycle signal ts is input from any one of the comparison means 42 and the continuously rising liquid level stability determination means 44, the set time T of the timer 61 is set to, for example, 2 seconds, while the short cycle signal ts is input. If not, the set time of the timer 61 is set to 5 seconds, for example. The timer 61 closes the measurement switch 33 every 2 seconds or 5 seconds according to the set time T to supply the power of the battery 32 to the measurement means 30. As a result, the measuring unit 30 measures once every 2 seconds or 5 seconds and outputs the measured value H to the control unit 4.
【００１９】また、測定間隔制御手段４５は、両比較手
段４１，４２および判別手段４４のいずれか１つから短
周期信号ｔｓが入力されたときは、送信間隔制御手段４
６に短周期信号ｔｓを出力し、一方、前記各手段４１，
４２，４４のすべてから長周期信号ｔ１が入力されたと
きは、送信間隔制御手段４６に長周期信号ｔ１を出力す
る。送信間隔制御手段４６は、測定間隔制御手段４５か
ら短周期信号ｔｓを受けると、カウンタ６２の設定値を
たとえば「２」に設定し、長周期信号ｔ１を受けると、
カウンタ６２の設定値をたとえば「６０」に設定する。
カウンタ６２は、クロックパルスをカウントして、設定
値に達すると計数内容を帰零すると共に、送信スイッチ
３４を閉成させて、バッテリー３２の電力を送信手段３
１に供給させる。したがって、送信間隔制御手段４６に
短周期信号ｔｓが入力されたときには、ＴS （２秒）×
２回＝４秒ごとに、送信手段３１が今回の測定値Ｈ0 を
今回送信値ｈ0 として送信する。一方、送信間隔制御手
段４６に長周期信号ｔ１が入力されているときには、Ｔ
L （５秒）×６０回＝５分ごとに、送信手段３１が今回
の測定値Ｈ0 を今回送信値ｈ0 として送信する。Further, the measurement interval control means 45 receives the short period signal ts from any one of the comparison means 41, 42 and the discrimination means 44, and the transmission interval control means 4 is provided.
6 outputs a short period signal ts to the respective means 41,
When the long cycle signal t1 is input from all of 42 and 44, the long cycle signal t1 is output to the transmission interval control means 46. When the transmission interval control means 46 receives the short cycle signal ts from the measurement interval control means 45, it sets the set value of the counter 62 to, for example, "2", and when it receives the long cycle signal t1,
The set value of the counter 62 is set to "60", for example.
The counter 62 counts clock pulses, and when the set value is reached, the counter contents are reset to zero, and the transmission switch 34 is closed to transmit the power of the battery 32 to the transmission means 3.
1 to supply. Therefore, when the short cycle signal ts is input to the transmission interval control means 46, T S (2 seconds) ×
The transmission means 31 transmits the current measurement value H 0 as the current transmission value h 0 every two times = 4 seconds. On the other hand, when the long cycle signal t1 is input to the transmission interval control means 46, T
Every time L (5 seconds) × 60 times = 5 minutes, the transmitting means 31 transmits the present measurement value H 0 as the present transmission value h 0 .
【００２０】なお、カウンタ６２が一旦、設定値「６
０」に設定された後、帰零前に、送信間隔制御手段４６
が短周期信号ｔｓを受けると、カウンタ６２を強制的に
帰零し送信スイッチ３４を閉成させて送信させると共
に、設定値が「２」に設定される。一方、カウンタ６２
が一旦、設定値「２」に設定された後、送信間隔制御手
段４６が長周期信号ｔ１を受けても、カウンタ６２の設
定値は次回の送信までの間は「２」に保持されるように
なっている。It should be noted that the counter 62 is temporarily set to "6".
After being set to "0" and before zeroing, the transmission interval control means 46
When the short period signal ts is received, the counter 62 is forcibly reset to zero, the transmission switch 34 is closed and transmitted, and the set value is set to "2". On the other hand, the counter 62
Even if the transmission interval control means 46 receives the long cycle signal t1 after the setting value is once set to "2", the setting value of the counter 62 is kept at "2" until the next transmission. It has become.
【００２１】前記第３比較手段４３は、今回の測定値Ｈ
0 から前回送信値ｈ1 を減算した測定送信間変位Δｈ0
を算出し、この測定送信間変位Δｈ0 と正の送信基準変
位ΔＰとを比較し、測定送信間変位Δｈ0 が正の送信基
準変位ΔＰよりも大きいときに、送信指令ａを出力して
カウンタ６２をリセットすると共に送信スイッチ３４を
閉成させる。また、第３比較手段４３は、算出した測定
送信間変位Δｈ0 と負の送信基準変位ΔＮ（負の値）と
を比較し、測定送信間変位Δｈ0 の方が負の送信基準変
位ΔＮよりも小さいとき（絶対値が大きいとき）も、送
信指令ａを出力して、カウンタ６２をリセットすると共
に送信スイッチ３４を閉成させる。なお、正の送信基準
変位ΔＰの絶対値は負の送信基準変位ΔＮの絶対値より
も小さな値に設定されている。また、正の送信基準変位
ΔＰの値は、測定間隔第１基準変位ΔＰ１および測定間
隔第２基準変位ΔＰ２よりも大きな値に設定されてお
り、したがって、測定送信間変位Δｈ0 の絶対値が非常
に大きい場合には、無条件に送信される。The third comparing means 43 measures the current measured value H
0 Measurements transmitted between displacement Delta] h 0 obtained by subtracting the previous transmission value h 1 from
Is calculated and this displacement between measurement transmissions Δh 0 is compared with the positive transmission reference displacement ΔP, and when the displacement between measurement transmissions Δh 0 is larger than the positive transmission reference displacement ΔP, the transmission command a is output and the counter is output. 62 is reset and the transmission switch 34 is closed. The third comparing means 43 compares the calculated inter-measurement-transmission displacement Δh 0 with the negative transmission reference displacement ΔN (negative value), and the inter-measurement-transmission displacement Δh 0 is more negative than the negative transmission reference displacement ΔN. Also when it is small (when the absolute value is large), the transmission command a is output to reset the counter 62 and close the transmission switch 34. The absolute value of the positive transmission reference displacement ΔP is set to be smaller than the absolute value of the negative transmission reference displacement ΔN. Further, the value of the positive transmission reference displacement ΔP is set to a value larger than the measurement interval first reference displacement ΔP1 and the measurement interval second reference displacement ΔP2, and therefore the absolute value of the measurement transmission displacement Δh 0 is extremely small. If it is large, it will be sent unconditionally.
【００２２】つぎに、上記構成の動作について説明す
る。まず、図６のように、液位が安定している場合は、
今回の測定値Ｈ0 と前回の測定値Ｈ1 との短期変位ΔＨ
0 が小さく、また、今回の測定値Ｈ0 と前回送信値ｈ1
との測定送信間変位Δｈ0 も小さいので、図５の測定間
隔制御手段４５には、長周期信号ｔ１が入力される。し
たがって、計測手段３０が長い測定間隔ＴLで測定を繰
り返す。したがって、無駄な測定がなされないから、測
定時の省電力化が図られる。Next, the operation of the above configuration will be described. First, as shown in FIG. 6, when the liquid level is stable,
Short-term displacement ΔH between the current measured value H 0 and the previous measured value H 1
0 is small, and the measured value H 0 of this time and the previously transmitted value h 1
Since the displacement Δh 0 between the measurement and transmission is also small, the long period signal t1 is input to the measurement interval control means 45 in FIG. Therefore, the measuring means 30 repeats the measurement at the long measurement interval T L. Therefore, since unnecessary measurement is not performed, power saving at the time of measurement can be achieved.
【００２３】この場合、送信間隔制御手段４６にも長周
期信号ｔ１が入力されるので、カウンタ６２の設定値が
「６０」に設定され、６０回の測定につき１回の送信が
なされる。したがって、送信時の省電力化も図られる。In this case, since the long-period signal t1 is also input to the transmission interval control means 46, the set value of the counter 62 is set to "60", and one transmission is made for every 60 measurements. Therefore, power saving at the time of transmission can be achieved.
【００２４】一方、図７のように液位が上昇して、今回
の測定値Ｈ0 から前回の測定値Ｈ1を減算した短期変位
ΔＨ0 が測定間隔第１基準変位ΔＰ１よりも大きくなる
と、図５の第１比較手段４１から測定間隔制御手段４５
に短周期信号ｔｓが出力されるので、タイマ６１の設定
時間が２秒に設定される。これにより、図７のように、
次回までの測定間隔が短い測定間隔ＴS （２秒）に設定
されて、計測手段３０が２秒間隔で計測を行う。この場
合、送信間隔制御手段４６にも短周期信号ｔｓが入力さ
れるので、２回の測定を行った後に１回の送信がなされ
る。したがって、ローリーから荷降し（注油）を行って
いる場合などは、短い測定間隔ＴS （２秒）で測定を行
い、４秒ごとに送信がなされるから、オーバーフローの
防止や、注油するタンクの間違いを早期に発見すること
が可能となる。つまり、レスポンスが損なわれるおそれ
もない。On the other hand, when the liquid level rises as shown in FIG. 7 and the short-term displacement ΔH 0 obtained by subtracting the previous measurement value H 1 from the current measurement value H 0 becomes larger than the first measurement interval reference displacement ΔP 1, From the first comparison means 41 to the measurement interval control means 45 in FIG.
Since the short cycle signal ts is output to, the set time of the timer 61 is set to 2 seconds. As a result, as shown in FIG.
The measurement interval until the next time is set to a short measurement interval T S (2 seconds), and the measuring means 30 measures at intervals of 2 seconds. In this case, the short cycle signal ts is also input to the transmission interval control means 46, so that the measurement is performed twice and then the transmission is performed once. Therefore, when unloading (lubrication) from the lorry, the measurement is performed at a short measurement interval T S (2 seconds), and the transmission is performed every 4 seconds, which prevents overflow and tanks for lubrication. It will be possible to detect the mistakes of earlier. That is, there is no fear that the response will be impaired.
【００２５】ところで、測定間隔第１基準変位ΔＰ１を
小さくすると、液面の揺れなどによる測定誤差で、誤っ
て液位の上昇を検知するので、測定間隔第１基準変位Δ
Ｐ１は、０よりも大きい正の値に設定するのが好まし
い。一方、測定間隔第１基準変位ΔＰ１を大きな値にす
ると、図８のように液位が徐々に上昇している場合には
連続する２回の測定値Ｈ1 ，Ｈ0 だけでは、液位の上昇
を検知できなくなる。特に、図１の地下タンク１は、断
面形状が円形であるため、液位が中間にある場合には、
液位の変動が極めて小さくなる。そこで、本実施例で
は、短期変位ΔＨ0だけでなく、以下のように、長期的
な変位に基づいて、測定間隔を制御している。By the way, if the first measurement interval first reference displacement ΔP1 is made small, a rise in the liquid level is erroneously detected due to a measurement error due to the fluctuation of the liquid surface or the like.
P1 is preferably set to a positive value greater than zero. On the other hand, when the measurement interval first reference displacement ΔP1 is set to a large value, when the liquid level gradually rises as shown in FIG. 8, the continuous two measured values H 1 and H 0 alone are enough to determine the liquid level. The rise cannot be detected. In particular, since the underground tank 1 of FIG. 1 has a circular cross-sectional shape, when the liquid level is in the middle,
The fluctuation of the liquid level becomes extremely small. Therefore, in this embodiment, the measurement interval is controlled based on not only the short-term displacement ΔH 0 but also the long-term displacement as follows.
【００２６】図８のように、液位が緩やかに上昇する
と、今回の測定値Ｈ0 から前回送信値ｈ1 を減算した測
定送信間変位Δｈ0 が測定間隔第２基準変位ΔＰ２より
も大きくなる。この場合、図５の第２比較手段４２から
測定間隔制御手段４５に短周期信号ｔｓが出力されるの
で、計測手段３０が短い測定間隔ＴS で測定を行う。し
たがって、緩やかな液位の上昇も検出し得る。As shown in FIG. 8, when the liquid level gradually rises, the displacement Δh 0 between measurement transmissions obtained by subtracting the previous transmission value h 1 from the current measurement value H 0 becomes larger than the second measurement interval reference displacement ΔP 2. . In this case, since the short period signal ts is output from the second comparing means 42 of FIG. 5 to the measurement interval control means 45, the measuring means 30 measures at the short measurement interval T S. Therefore, a gradual rise in the liquid level can also be detected.
【００２７】また、図９のように、液位が著しく上昇し
た場合には、早く送信して監視装置２に知らせる必要が
ある。そこで、本実施例では、図９のように、今回の測
定値Ｈ0 から前回送信値ｈ1 を減算した測定送信間変位
Δｈ0 が正の送信基準変位ΔＰよりも大きい場合は、図
５の第３比較手段４３がこれを検出して、送信スイッチ
３４に送信指令ａを出力する。したがって、測定間隔が
短い測定間隔ＴS になるだけでなく、直ちに今回の測定
値Ｈ0 が送信される。Further, as shown in FIG. 9, when the liquid level rises remarkably, it is necessary to send it early to notify the monitoring device 2. Therefore, in the present embodiment, as shown in FIG. 9, when the measured transmission-to-transmission displacement Δh 0 obtained by subtracting the previous transmission value h 1 from the current measurement value H 0 is larger than the positive transmission reference displacement ΔP, FIG. The third comparison means 43 detects this and outputs the transmission command a to the transmission switch 34. Therefore, not only the measurement interval is short measurement interval T S, immediately the current measurement value H 0 is transmitted.
【００２８】一方、図１０のように、液位が継続的に上
昇しているときは、ローリーから荷降し（注油）を行っ
ているのであるから、液位が安定するまで、短い測定間
隔ＴS で測定を繰り返すのが好ましい。そこで、本実施
例では、図１０のように、液位が継続して上昇している
場合には、図５の第１比較手段４１から継続上昇液位安
定判別手段４４に連続して入力された短周期信号ｔｓに
より、継続上昇を検知し、その後、継続上昇液位安定判
別手段４４が連続して数回長周期信号ｔ１を受けるま
で、図１０のように、短い測定間隔ＴS で測定を繰り返
す。On the other hand, as shown in FIG. 10, when the liquid level continuously rises, unloading (lubrication) is being carried out from the lorry. Therefore, a short measurement interval is required until the liquid level stabilizes. It is preferred to repeat the measurement at T S. Therefore, in the present embodiment, as shown in FIG. 10, when the liquid level is continuously rising, it is continuously input from the first comparing means 41 of FIG. 5 to the continuously rising liquid level stability determining means 44. the short period signal ts were senses continued rise, then to undergo several long-period signal t1 is continued rising liquid level stability determination means 44 in succession, as in FIG. 10, measured in the short measurement interval T S repeat.
【００２９】また、図１１のように、液位が著しく下降
した場合にも、早く送信して、監視装置２に知らせる必
要がある。そこで、本実施例では、図１１のように、今
回の測定値Ｈ0 から前回送信値ｈ1 を減算した測定送信
間変位Δｈ0 （負の値）が、負の送信基準変位ΔＮ（負
の値）よりも小さい（絶対値が大きい）場合には、図５
の第３比較手段４３がこれを検出して、送信指令ａを送
信スイッチ３４に出力する。したがって、この場合に
は、直ちに今回の測定値Ｈ0 が送信される。Further, as shown in FIG. 11, even when the liquid level is significantly lowered, it is necessary to send it early to notify the monitoring device 2. Therefore, in the present embodiment, as shown in FIG. 11, the measurement transmission displacement Δh 0 (negative value) obtained by subtracting the previous transmission value h 1 from the current measurement value H 0 is a negative transmission reference displacement ΔN (negative value). Value is smaller (absolute value is larger),
The third comparing means 43 detects the above and outputs the transmission command a to the transmission switch 34. Therefore, in this case, the current measurement value H 0 is immediately transmitted.
【００３０】ところで、本実施例では、発明の内容を分
かり易くするために、図３の計測手段３０が液位を測定
することとしたが、計測手段３０はたとえば天井から液
面までの距離を測定するものでもよく、本発明の範囲
は、かかる場合も含まれる。なお、液面までの距離を測
定した場合は、液位を測定する場合と変位ΔＨ0 の符号
が逆になる。したがって、本明細書において、「変位Δ
Ｈ0 ，Δｈ0 が基準変位ΔＰ１，ΔＰ２，ΔＰ，ΔＮよ
りも大きい」とは、「絶対値が大きい」ことを意味する
ものと解釈しなければならない。In the present embodiment, in order to make the content of the invention easy to understand, the measuring means 30 in FIG. 3 measures the liquid level, but the measuring means 30 measures the distance from the ceiling to the liquid surface, for example. It may be measured, and the scope of the present invention includes such cases. When the distance to the liquid surface is measured, the sign of the displacement ΔH 0 is opposite to that when the liquid level is measured. Therefore, in this specification, "displacement Δ
"H 0 and Δh 0 are larger than the reference displacements ΔP1, ΔP2, ΔP, and ΔN" should be interpreted to mean that "the absolute value is large".
【００３１】また、本実施例では、今回の測定値Ｈ0 と
前回の測定値Ｈ1 との変位を短期変位ΔＨ0 としたが、
本発明では、今回の測定値Ｈ0 と前々回の測定値Ｈ
2 （今回よりも前の測定値Ｈm ）との変位を短期変位Δ
Ｈ0 としてもよい。たとえば、測定を５秒ごとに行って
いる場合に、今回の測定値Ｈ0 と１０秒前の測定値（２
回前の測定値）Ｈ2 との変位を算出した場合にも、本発
明に含まれる。Further, in this embodiment, the displacement between the measurement value H 1 of the current measured value H 0 and the previous was a short-term displacement [Delta] H 0,
In the present invention, the measured value H 0 of this time and the measured value H of the previous two times are
2 (measured value H m before this time) is the short-term displacement Δ
It may be H 0 . For example, when the measurement is performed every 5 seconds, the current measurement value H 0 and the measurement value 10 seconds before (2
The present invention also includes the case where the displacement with respect to the measured value before the measurement) H 2 is calculated.
【００３２】さらに、本実施例では、今回の測定値Ｈ0
と前回送信値ｈ1 との変位である測定送信間変位Δｈ0
を長期変位ΔＨL としたが、本発明では、今回の測定値
Ｈ0と前の測定値Ｈm （たとえば前回の測定値Ｈ1 ）よ
りも更に以前に測定した古い測定値Ｈn との変位を長期
変位ΔＨL として測定し、長期変位ΔＨL と測定間隔第
２基準変位ΔＰ２とを比較することで、長期的な変動、
つまり、液位の緩やかな上昇を検出してもよい。Further, in the present embodiment, the present measured value H 0
Displacement between measurement and transmission Δh 0 which is the displacement between the previous transmission value h 1 and
The long-term displacement [Delta] H L and the but, in the present invention, the displacement between the current measured value H 0 and the previous measurement value H m (e.g. previous measurement value H 1) older measurements H n measured more previously than was measured as a long-term displacement [Delta] H L, by comparing the long-term displacement [Delta] H L and the measurement interval second reference displacement [Delta] P2, long-term variations,
That is, a gradual rise in the liquid level may be detected.
【００３３】また、本実施例では、短い測定間隔ＴS と
長い測定間隔ＴL との２種類の測定間隔で測定を行うこ
ととしたが、測定間隔は３種類以上に設定してもよく、
あるいは、無段階的に測定間隔を設定してもよい。無段
階にする方法としては、たとえば、設定値を短期変位Δ
Ｈ0 で除算して、短期変位ΔＨ0 が小さい程、大きな測
定間隔で測定させ、一方、短期変位ΔＨ0 が大きい程、
小さな測定間隔で測定させてもよい。なお、この場合、
上下限の測定間隔を予め設定しておくのが好ましい。Further, in the present embodiment, the measurement is performed at two kinds of measurement intervals, that is, the short measurement interval T S and the long measurement interval T L , but the measurement interval may be set to three or more,
Alternatively, the measurement interval may be set steplessly. As a method of making stepless, for example, the set value is set to
Dividing by H 0 , the smaller the short-term displacement ΔH 0 , the larger the measurement interval, and the larger the short-term displacement ΔH 0 becomes.
You may make it measure at small measurement intervals. In this case,
It is preferable to preset the upper and lower measurement intervals.
【００３４】また、本実施例では、測定間隔が長い場合
に、６０回測定するごとに送信したが、送信の最大許容
間隔を時間で設定して、少なくとも最大許容時間になる
毎に送信を行うこととしてもよい。Further, in the present embodiment, when the measurement interval is long, the measurement is performed every 60 times, but the maximum allowable transmission interval is set by time, and the transmission is performed at least at the maximum allowable time. It may be that.
【００３５】また、本実施例では、液位が２回連続して
上昇した場合、液位が継続して上昇していると判断した
が、ｎ回（ｎは２以上）測定して、ｍ回（ｍはｎ以下の
２以上の自然数）以上液位が上昇していれば、液位が継
続的に上昇しているとみなしてもよい。In this embodiment, when the liquid level continuously rises twice, it is determined that the liquid level continuously rises. However, the measurement is performed n times (n is 2 or more) and m If the liquid level rises more than times (m is a natural number of 2 or more, which is n or less), it may be considered that the liquid level continuously rises.
【００３６】一方、本実施例では、液位が数回連続して
下降ないし同じであれば、液位が安定したと判断した
が、２回ないし１０回程度連続して液位が下降ないし同
じであれば、液位が安定したと判断することとしてもよ
い。On the other hand, in the present embodiment, if the liquid level is lowered or the same for several consecutive times, it is judged that the liquid level is stable, but the liquid level is lowered or the same for 2 to 10 times continuously. If so, it may be determined that the liquid level is stable.
【００３７】なお、本無線式液位測定送信装置では、数
十回〜数百回の送信毎にＡ／Ｄ変換したバッテリーの電
圧値を、図１の無線式液位測定送信装置３から監視装置
２に送信してもよい。このようにすれば、監視装置２に
おいて、バッテリー３２の交換時期を推定することがで
き、したがって、バッテリー切れによるシステムダウン
を未然に防止することができる。In the wireless liquid level measuring / transmitting device, the voltage value of the battery A / D converted every several tens to several hundreds of transmissions is monitored from the wireless liquid level measuring / transmitting device 3 in FIG. It may be transmitted to the device 2. With this configuration, the monitoring device 2 can estimate the replacement time of the battery 32, and thus can prevent the system from going down due to the battery exhaustion.
【００３８】ところで、前記実施例では、送信手段３１
からの送信周波数を地下タンク１ごとに異ならせたが、
本発明では、必ずしもそうする必要はない。たとえば、
図２の各無線式液位測定送信装置３が、送信手段３１お
よび受信手段を備え、送信前に、他の地下タンク１から
の送信が行なわれているか否かを判断し、送信が行なわ
れていないことを条件に、タンクＮｏ．を含めて、送信
を開始することとしてもよい。この場合には、送信周波
数をタンクごとに異ならせる必要がない。By the way, in the above embodiment, the transmitting means 31
I changed the transmission frequency from each underground tank 1,
The present invention does not have to do so. For example,
Each wireless liquid level measuring and transmitting device 3 in FIG. 2 is provided with a transmitting means 31 and a receiving means, judges whether or not another underground tank 1 is transmitting before transmitting, and transmits. If the tank No. It is also possible to start the transmission including. In this case, it is not necessary to make the transmission frequency different for each tank.
【００３９】[0039]
【発明の効果】以上説明したように、本発明によれば、
今回の測定値Ｈ0 と今回よりも前の測定値Ｈm とを比較
して、送信間隔の他に、測定間隔をも変化させるので、
ローリーから荷降しを行っているような特別な場合等を
除き、測定間隔を長くすることができる。したがって、
レスポンスの良い測定を行いつつ、送信時だけでなく、
測定時についても省電力化が図られる。その結果、防爆
仕様における特別な技術が必要なバッテリーの交換回数
を極力減らすことができる。As described above, according to the present invention,
Since the measured value H 0 this time and the measured value H m before this time are compared and the measurement interval is changed in addition to the transmission interval,
The measurement interval can be extended except in special cases where the truck is unloaded. Therefore,
While making a measurement with a good response, not only when sending,
Power saving is also achieved during measurement. As a result, the number of battery replacements that require special technology for explosion-proof specifications can be reduced as much as possible.
【００４０】また、請求項３の発明によれば、今回の測
定値Ｈ0 から今回よりも前の測定値Ｈm を減算した短期
変位ΔＨ0 を測定間隔第１基準変位ΔＰ１と比較するだ
けでなく、今回の測定値Ｈ0 から、前記今回よりも前の
測定値Ｈm よりも更に以前に測定した古い測定値Ｈn を
減算した長期変位ΔＨL を、測定間隔第２基準変位ΔＰ
２と比較している。したがって、緩やかな液位の上昇を
長期変位ΔＨL で検出し得ると共に、短期変位ΔＨ0 と
比較する測定間隔第１基準変位ΔＰ１を差程小さな値に
する必要がないので、液面の波打ちなどによる検出の誤
りで、測定間隔が度々短くなるという事態を防止できる
から、より一層省電力化を図ることができる。According to the third aspect of the invention, the short-term displacement ΔH 0 obtained by subtracting the measurement value H m before this time from the measurement value H 0 at this time is simply compared with the first measurement interval reference displacement ΔP 1. without the current measurement value H 0, the long-term displacement [Delta] H L obtained by subtracting the old measured value H n measured further before than the measurement value H m before the than this, the measurement interval second reference displacement ΔP
Compared to 2. Therefore, since it is possible to detect a gradual increase in the liquid level by the long-term displacement ΔH L and it is not necessary to make the measurement interval first reference displacement ΔP1 to be compared with the short-term displacement ΔH 0 a value that is too small, it is possible to corrugate the liquid surface. Since it is possible to prevent a situation in which the measurement interval is often shortened due to a detection error caused by, it is possible to further reduce power consumption.
【００４１】さらに、請求項４の発明によれば、今回の
測定値Ｈ0 から前回送信値ｈ1 を減算した測定送信間変
位Δｈ0 を前記長期変位ΔＨL としたから、前回送信値
ｈ1と今回の測定値Ｈ0 との差（測定送信間変位Δ
ｈ0 ）が大きくなったときは、短い測定間隔ＴS で測定
を行うので、レスポンスの良い測定を行うことができ
る。Furthermore, according to the invention of claim 4, the measurement transmission between displacement Delta] h 0 obtained by subtracting the previous transmission value h 1 from the current measured value H 0 because the said long displacement [Delta] H L, previous transmission value h 1 And the measured value H 0 of this time (displacement Δ between measured transmissions
When h 0 ) becomes large, the measurement is performed at a short measurement interval T S , so that the measurement with good response can be performed.
【図１】本発明の一実施例にかかる給油所のシステムを
説明する断面図である。FIG. 1 is a cross-sectional view illustrating a system of a gas station according to an embodiment of the present invention.
【図２】同システムの概略構成図である。FIG. 2 is a schematic configuration diagram of the system.
【図３】計測手段の一例を示す概略構成図である。FIG. 3 is a schematic configuration diagram showing an example of a measuring unit.
【図４】監視装置の一例を示す概略構成図である。FIG. 4 is a schematic configuration diagram showing an example of a monitoring device.
【図５】無線式液位測定送信装置の一実施例を示す概略
構成図である。FIG. 5 is a schematic configuration diagram showing an embodiment of a wireless liquid level measurement and transmission device.
【図６】液位安定中の測定・送信間隔を示す概念図であ
る。FIG. 6 is a conceptual diagram showing a measurement / transmission interval during liquid level stabilization.
【図７】液位が上昇した場合の測定・送信間隔を示す概
念図である。FIG. 7 is a conceptual diagram showing a measurement / transmission interval when the liquid level rises.
【図８】液位が緩やかに上昇した場合の測定・送信間隔
を示す概念図である。FIG. 8 is a conceptual diagram showing a measurement / transmission interval when the liquid level gently rises.
【図９】液位が急激に上昇した場合の測定・送信間隔を
示す概念図である。FIG. 9 is a conceptual diagram showing a measurement / transmission interval when the liquid level rises sharply.
【図１０】液位が継続的に上昇した場合の測定・送信間
隔を示す概念図である。FIG. 10 is a conceptual diagram showing a measurement / transmission interval when the liquid level continuously rises.
【図１１】液位が急激に下降した場合の測定・送信間隔
を示す概念図である。FIG. 11 is a conceptual diagram showing a measurement / transmission interval when the liquid level sharply drops.
３：無線式液位測定送信装置 ４０：記憶部 ４１：第１比較手段 ４２：第２比較手段 ４５：測定間隔制御手段 ４６：送信間隔制御手段 3: Wireless liquid level measurement transmission device 40: Storage unit 41: First comparison means 42: Second comparison means 45: Measurement interval control means 46: Transmission interval control means
Claims (4)
定し、この測定した測定値を無線で送信すると共に、測
定値の送信間隔を測定結果に基づいて変化させる無線式
液位測定送信装置において、 今回の測定値Ｈ0 と今回よりも前の測定値Ｈm とを比較
する比較手段と、 短い測定間隔ＴS および長い測定間隔ＴL の少なくとも
２種類の測定間隔で前記計測手段に測定させると共に、
前記比較手段による比較結果に基づいて、次回以後の測
定間隔を制御する測定間隔制御手段とを備えていること
を特徴とする無線式液位測定送信装置。1. A wireless liquid level measurement transmission in which a value related to the liquid level of fuel oil is measured by a measuring means, the measured value is transmitted wirelessly, and the transmission interval of the measured value is changed based on the measurement result. In the apparatus, a comparing means for comparing the measured value H 0 of this time with the measured value H m before this time, and the measuring means with at least two kinds of measuring intervals of a short measuring interval T S and a long measuring interval T L Let me measure,
A wireless liquid level measuring and transmitting apparatus comprising: a measurement interval control unit that controls a measurement interval from the next time on the basis of a comparison result by the comparison unit.
定し、この測定した測定値を無線で送信すると共に、測
定値の送信間隔を測定結果に基づいて変化させる無線式
液位測定送信装置において、 測定間隔基準変位ΔＰ１を記憶する記憶部と、 今回の測定値Ｈ0 から今回よりも前の測定値Ｈm を減算
した変位ΔＨ0 を、前記測定間隔基準変位ΔＰ１と比較
する比較手段と、 短い測定間隔ＴS および長い測定間隔ＴL の少なくとも
２種類の測定間隔で前記計測手段に測定させると共に、
前記比較手段による比較の結果、前記変位ΔＨ0 が測定
間隔基準変位ΔＰ１よりも大きいときには、次回の測定
までの測定間隔を前記短い測定間隔ＴS で測定させる測
定間隔制御手段とを備えていることを特徴とする無線式
液位測定送信装置。2. A wireless liquid level measurement transmission in which a value relating to the liquid level of fuel oil is measured by a measuring means, the measured value is wirelessly transmitted, and the measured value transmission interval is changed based on the measurement result. In the apparatus, a storage unit that stores the measurement interval reference displacement ΔP1 and a comparison unit that compares the displacement ΔH 0 obtained by subtracting the measurement value H m before this time from the measurement value H 0 of this time with the measurement interval reference displacement ΔP1. And causing the measuring means to measure at least two types of measurement intervals, a short measurement interval T S and a long measurement interval T L ,
When the displacement ΔH 0 is larger than the measurement interval reference displacement ΔP1 as a result of the comparison by the comparison unit, a measurement interval control unit for measuring the measurement interval until the next measurement at the short measurement interval T S is provided. A wireless liquid level measuring and transmitting device characterized by:
定し、この測定した測定値を無線で送信すると共に、測
定値の送信間隔を測定結果に基づいて変化させる無線式
液位測定送信装置において、 測定間隔第１基準変位ΔＰ１および測定間隔第２基準変
位ΔＰ２を記憶する記憶部と、 今回の測定値Ｈ0 から今回よりも前の測定値Ｈm を減算
した短期変位ΔＨ0 を、前記測定間隔第１基準変位ΔＰ
１と比較する第１比較手段と、 今回の測定値Ｈ0 から、前記前の測定値Ｈm よりも更に
以前に測定した古い測定値Ｈn を減算した長期変位ΔＨ
L を、前記測定間隔第２基準変位ΔＰ２と比較する第２
比較手段と、 短い測定間隔ＴS および長い測定間隔ＴL の少なくとも
２種類の測定間隔で前記計測手段に測定させると共に、
前記比較の結果、前記短期変位ΔＨ0 が測定間隔第１基
準変位ΔＰ１よりも大きいときと、前記長期変位ΔＨL
が測定間隔第２基準変位ΔＰ２よりも大きいときには、
次回の測定までの測定間隔を前記短い測定間隔ＴS で測
定させる測定間隔制御手段とを備えていることを特徴と
する無線式液位測定送信装置。3. A wireless liquid level measurement transmission in which a value related to the liquid level of fuel oil is measured by a measuring means, the measured value is transmitted wirelessly, and the transmission interval of the measured value is changed based on the measurement result. In the device, a storage unit that stores the first measurement interval reference displacement ΔP1 and the second measurement interval reference displacement ΔP2, and the short-term displacement ΔH 0 obtained by subtracting the measurement value H m before this time from the measurement value H 0 at this time, The measurement interval first reference displacement ΔP
And a long-term displacement ΔH obtained by subtracting an old measurement value H n measured earlier than the previous measurement value H m from the present measurement value H 0.
A second comparing L with the second reference displacement ΔP2 of the measurement interval
A comparing means, and causing the measuring means to measure at least two kinds of measuring intervals of a short measuring interval T S and a long measuring interval T L ,
As a result of the comparison, when the short-term displacement ΔH 0 is larger than the measurement interval first reference displacement ΔP 1, and when the long-term displacement ΔH L is
Is larger than the measurement interval second reference displacement ΔP2,
A wireless liquid level measuring and transmitting device comprising: a measuring interval control means for measuring the measuring interval until the next measurement at the short measuring interval T S.
定し、この測定した測定値を無線で送信すると共に、測
定値の送信間隔を測定結果に基づいて変化させる無線式
液位測定送信装置において、 測定間隔第１基準変位ΔＰ１および測定間隔第２基準変
位ΔＰ２を記憶する記憶部と、 今回の測定値Ｈ0 から今回よりも前の測定値Ｈm を減算
した短期変位ΔＨ0 を、前記測定間隔第１基準変位ΔＰ
１と比較する第１比較手段と、 今回の測定値Ｈ0 から前回送信した前回送信値ｈ1 を減
算した測定送信間変位Δｈ0 を、前記測定間隔第２基準
変位ΔＰ２と比較する第２比較手段と、 短い測定間隔ＴS および長い測定間隔ＴL の少なくとも
２種類の測定間隔で前記計測手段に測定させると共に、
前記比較の結果、前記短期変位ΔＨ0 が測定間隔第１基
準変位ΔＰ１よりも大きいときと、前記測定送信間変位
Δｈ0 が測定間隔第２基準変位ΔＰ２よりも大きいとき
には、次回の測定までの測定間隔を前記短い測定間隔Ｔ
S で測定させる測定間隔制御手段とを備えていることを
特徴とする無線式液位測定送信装置。4. A wireless liquid level measurement transmission in which a value related to the liquid level of fuel oil is measured by a measuring means, the measured value is wirelessly transmitted, and the measurement value transmission interval is changed based on the measurement result. In the device, a storage unit that stores the first measurement interval reference displacement ΔP1 and the second measurement interval reference displacement ΔP2, and the short-term displacement ΔH 0 obtained by subtracting the measurement value H m before this time from the measurement value H 0 at this time, The measurement interval first reference displacement ΔP
1st comparison means for comparing with 1, and second comparison for comparing displacement Δh 0 between measurement and transmission obtained by subtracting previously transmitted value h 1 transmitted last time from measured value H 0 of this time with said measurement interval second reference displacement ΔP2 Means for causing the measuring means to measure at least two types of measurement intervals, a short measurement interval T S and a long measurement interval T L ,
As a result of the comparison, when the short-term displacement ΔH 0 is larger than the measurement interval first reference displacement ΔP1 and when the inter-measurement transmission displacement Δh 0 is larger than the measurement interval second reference displacement ΔP2, the measurement until the next measurement is performed. The interval is the short measurement interval T
A wireless liquid level measuring and transmitting device comprising: a measuring interval control means for measuring at S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19919995A JP3516776B2 (en) | 1995-07-11 | 1995-07-11 | Wireless liquid level measurement transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19919995A JP3516776B2 (en) | 1995-07-11 | 1995-07-11 | Wireless liquid level measurement transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0926347A true JPH0926347A (en) | 1997-01-28 |
| JP3516776B2 JP3516776B2 (en) | 2004-04-05 |
Family
ID=16403795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19919995A Expired - Fee Related JP3516776B2 (en) | 1995-07-11 | 1995-07-11 | Wireless liquid level measurement transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3516776B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168674A (en) * | 2000-11-30 | 2002-06-14 | Oyo Corp | Submerged water level meter |
| JP2003296866A (en) * | 2002-03-29 | 2003-10-17 | Omron Corp | Information processor and processing method |
| EP1412929A2 (en) * | 2001-07-25 | 2004-04-28 | Atlinks USA, Inc. | Method and system for efficiently regulating data transmissions |
| JP2009053111A (en) * | 2007-08-28 | 2009-03-12 | Toshiba Corp | Sensor device |
| US7716000B2 (en) | 2007-08-28 | 2010-05-11 | Kabushiki Kaisha Toshiba | Sensor apparatus having sensor element |
| JP2011042943A (en) * | 2009-08-19 | 2011-03-03 | Metawater Co Ltd | Manhole unit for measuring water level |
| JP2020180939A (en) * | 2019-04-26 | 2020-11-05 | 松村物産株式会社 | Residual amount management system, distance measuring unit, and residual amount management method |
| JP2021099350A (en) * | 2015-08-21 | 2021-07-01 | トゥルマ・ゲレーテテッヒニク・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ウント・コムパニー・コマンディットゲゼルシャフトＴｒｕｍａ Ｇｅｒａｅｔｅｔｅｃｈｎｉｋ ＧｍｂＨ ＆ Ｃｏ． ＫＧ | Liquid level measurement device, method of operating the same, and assembly consisting of the same and at least one spacer |
-
1995
- 1995-07-11 JP JP19919995A patent/JP3516776B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168674A (en) * | 2000-11-30 | 2002-06-14 | Oyo Corp | Submerged water level meter |
| JP4569999B2 (en) * | 2000-11-30 | 2010-10-27 | 応用地質株式会社 | Submerged water level gauge |
| EP1412929A2 (en) * | 2001-07-25 | 2004-04-28 | Atlinks USA, Inc. | Method and system for efficiently regulating data transmissions |
| EP1412929A4 (en) * | 2001-07-25 | 2008-03-12 | Atlinks Usa Inc | Method and system for efficiently regulating data transmissions |
| JP2003296866A (en) * | 2002-03-29 | 2003-10-17 | Omron Corp | Information processor and processing method |
| US7239982B2 (en) | 2002-03-29 | 2007-07-03 | Omron Corporation | Information processing device and method |
| JP2009053111A (en) * | 2007-08-28 | 2009-03-12 | Toshiba Corp | Sensor device |
| US7716000B2 (en) | 2007-08-28 | 2010-05-11 | Kabushiki Kaisha Toshiba | Sensor apparatus having sensor element |
| JP2011042943A (en) * | 2009-08-19 | 2011-03-03 | Metawater Co Ltd | Manhole unit for measuring water level |
| JP2021099350A (en) * | 2015-08-21 | 2021-07-01 | トゥルマ・ゲレーテテッヒニク・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ウント・コムパニー・コマンディットゲゼルシャフトＴｒｕｍａ Ｇｅｒａｅｔｅｔｅｃｈｎｉｋ ＧｍｂＨ ＆ Ｃｏ． ＫＧ | Liquid level measurement device, method of operating the same, and assembly consisting of the same and at least one spacer |
| US11530942B2 (en) | 2015-08-21 | 2022-12-20 | Truma Geraetetechnik Gmbh & Co. Kg | Device and method for measuring the level of liquid in a container |
| JP2020180939A (en) * | 2019-04-26 | 2020-11-05 | 松村物産株式会社 | Residual amount management system, distance measuring unit, and residual amount management method |
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|---|---|
| JP3516776B2 (en) | 2004-04-05 |
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