JP2000065625A - Water level gage - Google Patents
Water level gageInfo
- Publication number
- JP2000065625A JP2000065625A JP10238101A JP23810198A JP2000065625A JP 2000065625 A JP2000065625 A JP 2000065625A JP 10238101 A JP10238101 A JP 10238101A JP 23810198 A JP23810198 A JP 23810198A JP 2000065625 A JP2000065625 A JP 2000065625A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- signal
- display
- digital display
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は上下水道や河川，貯
水池などの水位の測定や堰などの水位測定から流量を測
定するための検出器と変換器からなる投込式水位計に関
し、特に、水位を表示する表示器にかんするものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion type water level meter comprising a detector and a converter for measuring a water level of a water supply and sewage system, a river, a reservoir, and the like, and measuring a flow rate from a water level measurement of a weir. It relates to an indicator that displays the water level.
【０００２】[0002]
【従来の技術】従来の水頭圧力を利用した投込式水位計
は図２に示すように検出器１と変換器２からなり、両者
を電線３および、大気圧を導入するパイプ４を組み込ん
だ中空ケーブル５で接続している。検出器は水中６に沈
めて設置されるため、検出器の先端にある圧力センサで
圧力を測定し、圧力値を水位に変換しレベル信号として
いる。検出器に加わる圧力は水の水頭圧と大気の圧力の
和であり、水位計としては大気圧はレベルに関係しない
ため不要である。2. Description of the Related Art As shown in FIG. 2, a conventional immersion type water level gauge utilizing a head pressure comprises a detector 1 and a converter 2, both of which incorporate an electric wire 3 and a pipe 4 for introducing atmospheric pressure. They are connected by a hollow cable 5. Since the detector is placed submerged in the water 6, the pressure is measured by a pressure sensor at the tip of the detector, and the pressure value is converted into a water level to be used as a level signal. The pressure applied to the detector is the sum of the head pressure of the water and the pressure of the atmosphere. Atmospheric pressure is not necessary for a water level gauge because it does not depend on the level.
【０００３】しかしながら、大気圧は時々刻々と変動
し、かつ、無視できない大きな圧力であるため、圧力セ
ンサの他方には大気圧をパイプで導入し、大気圧を相殺
するように構成して正確な水位測定をしている。[0003] However, since the atmospheric pressure fluctuates every moment and is a large pressure that cannot be ignored, the atmospheric pressure is introduced into the other of the pressure sensors by a pipe to correct the atmospheric pressure. I am measuring the water level.
【０００４】このような水位計では従来変換器の水位を
表示するアナログの表示器７が備えられ、変換器のレベ
ル出力信号であるＤＣ４〜２０ｍＡで動作している。８
は水位計の電源を示す。[0004] Such a water level meter is conventionally provided with an analog display 7 for displaying the water level of the converter, and operates at 4 to 20 mA DC which is the level output signal of the converter. 8
Indicates the power supply of the water level gauge.
【０００５】以前は表示器としてアナログ指示計が主流
で、文字板に測定範囲に合わせた実目盛りを書いてい
た。このような実目盛りアナログ指示計は製作期間が長
く、製作数も少ないため高価なものであった。In the past, analog indicators were mainly used as indicators, and actual scales were written on the dial in accordance with the measurement range. Such a real scale analog indicator is expensive because of a long production period and a small number of productions.
【０００６】近年ではアナログ指示計にかわってデジタ
ル指示計が主流になっており、アナログ指示計は製作さ
れなくなっている。一般のデジタル指示計では信号配線
の他にデジタル指示計駆動電源が必要であり、配線数が
電源配線２本と信号配線が２本の合計４本必要なものが
一般的であった。また、表示を調整する機能が無かった
り、有ったとしても調整範囲が極端に少ないなど問題が
あった。In recent years, digital indicators have become the mainstream in place of analog indicators, and analog indicators have not been manufactured. A general digital indicator requires a digital indicator drive power supply in addition to the signal wiring, and the number of wirings is generally two, that is, two power supply wirings and two signal wirings in total. In addition, there is a problem that there is no function for adjusting the display, or even if there is, the adjustment range is extremely small.
【０００７】特に、水位計では測定の基準位置を地表、
または、水底、あるいは水位を測定する水処理システム
の特定レベルを基準とするため、例えば−１０ｍから１
０ｍの測定範囲となることもある。水位の表示もマイナ
スのレベル範囲が広くなったり、プラスのレベル範囲が
広かったりすることが多い。など、従来のデジタル指示
計では表示できないなどの問題があった。[0007] In particular, in the water gauge, the reference position of the measurement is the ground surface,
Or, for reference to a specific level of a water treatment system for measuring a water bottom or a water level, for example, from -10 m to 1
The measurement range may be 0 m. The display of the water level often has a wide negative level range and a wide positive level range. There was a problem that the display could not be performed with a conventional digital indicator.
【０００８】[0008]
【発明が解決しようとする課題】変換器の水位出力信号
であるＤＣ４〜２０ｍＡで動作するデジタル表示器を内
蔵する変換器にあって、４ｍＡ時のデジタル表示器の表
示レベル範囲が広く、その調整量が測定スパンの調整量
とほぼ同じとする。SUMMARY OF THE INVENTION A converter having a built-in digital display operating at 4 to 20 mA DC, which is a water level output signal of the converter, has a wide display level range at 4 mA and its adjustment. The amount shall be approximately the same as the adjustment amount of the measurement span.
【０００９】[0009]
【課題を解決するための手段】最小動作電流がＤＣ４ｍ
Ａのデジタル２線式表示器のＤＣ／ＤＣ変換器と演算器
の間に定電圧発生器とその電圧を分割し、演算器のもう
１つ入力とする抵抗群を設けて、大幅なゼロ点調整範囲
を得る。The minimum operating current is DC4m.
A constant voltage generator and its voltage are divided between the DC / DC converter and the arithmetic unit of the digital two-wire display of A, and a resistor group as another input of the arithmetic unit is provided, and a large zero point is provided. Get the adjustment range.
【００１０】[0010]
【発明の実施の形態】図３はＤＣ４〜２０ｍＡで動作す
る２線式のデジタル表示器のブロックダイアグラムを示
すものである。図においてデジタル表示器のプラス入力
端子９とマイナス入力端子９′の間にはＤＣ／ＤＣ変換
器１０と演算器１１，コンピュータ１２，液晶表示器１
３，信号電流検出抵抗Ｒｓ１４などがあり、Ｒｓの信号
電圧は可変抵抗Ｒｖ１５で演算器へ水位信号を入力し、
可変抵抗Ｒｖでスパンの５％程度のわずかなゼロ点調整
をする。FIG. 3 shows a block diagram of a two-wire digital display operating at 4-20 mA DC. In the figure, a DC / DC converter 10, an arithmetic unit 11, a computer 12, a liquid crystal display 1 are provided between a positive input terminal 9 and a negative input terminal 9 'of the digital display.
3. There is a signal current detection resistor Rs14, etc., and the signal voltage of Rs is input to the arithmetic unit with a variable resistor Rv15,
A slight zero point adjustment of about 5% of the span is performed by the variable resistor Rv.
【００１１】また、演算器には増幅率を決めた測定量を
定めるスパン調整可変抵抗Ｒｐ１６がある。また、ＤＣ
／ＤＣ変換器と演算器の間には本発明のＤＣ／ＤＣ変換
器の大きな電圧を定電圧発生器とその電圧を分割し、演
算器の入力とする抵抗群を設けて、大幅なゼロ点調整範
囲を得る構成としている。以下本発明を詳細に説明す
る。The arithmetic unit has a span adjustment variable resistor Rp16 for determining a measured quantity for which the amplification factor is determined. Also, DC
Between the DC / DC converter and the arithmetic unit, a large voltage of the DC / DC converter of the present invention is divided into a constant voltage generator and the voltage, and a resistor group as an input of the arithmetic unit is provided to greatly reduce the zero point. The adjustment range is obtained. Hereinafter, the present invention will be described in detail.
【００１２】ＤＣ／ＤＣ変換器ではレベル信号回路の１
次側電圧降下１.５から２.５Ｖの電圧を３.５Ｖ から６
Ｖの２次側電圧に変換している。また、レベル信号検出
抵抗Ｒｓ部の電圧降下は最小でＲｓ×４ｍＡで、Ｒｓを
１０オームとしても４０ｍＡと小さい。したがって、Ｒ
ｓの信号電圧のみでゼロ点調整を行った場合は測定スパ
ンの±５％程度となる。In the DC / DC converter, one of the level signal circuits
The secondary side voltage drop of 1.5 to 2.5V is changed from 3.5V to 6
V is converted to a secondary voltage. Further, the voltage drop of the level signal detection resistor Rs is a minimum of Rs × 4 mA, and is as small as 40 mA even if Rs is set to 10 ohms. Therefore, R
When the zero point adjustment is performed only with the signal voltage of s, it is about ± 5% of the measurement span.
【００１３】本発明ではゼロ点調整に使用する電圧をＤ
Ｃ／ＤＣ変換器の出力電圧を固定抵抗Ｒ1１７ と定電圧
発生器１８で安定な定電圧を発生し、この電圧をゼロ点
調整抵抗Ｒｚ１９と固定抵抗Ｒ2２０ で分割し、ゼロ点
調整用の大きな電圧を得る。定電圧発生器はＩＣ化され
たローパワーの１.２５から２.５Ｖ出力の素子を使用す
る。現在では２００マイクロワットのローパワーの素子
もあるため、レベル信号電流増加による影響もなく、目
的を達成することができた。なお、可変抵抗Ｒｖは調整
範囲が狭いため、半固定抵抗か固定抵抗としレベル信号
検出器のみとし、ゼロ点調整はＲｚのみで行うこととす
ることができる。In the present invention, the voltage used for zero point adjustment is D
The output voltage of the C / DC converter stable constant voltage generated and the fixed resistor R 1 17 in the constant voltage generator 18 divides the voltage zero point adjustment resistor Rz19 fixed resistors R 2 20, the zero point adjustment To get a big voltage for. The constant voltage generator uses a low-power 1.25 to 2.5 V output element integrated into an IC. At present, there is an element having a low power of 200 microwatts, so that the object can be achieved without being affected by an increase in the level signal current. Since the variable resistor Rv has a narrow adjustment range, the variable resistor Rv can be a semi-fixed resistor or a fixed resistor, and only the level signal detector can be used, and the zero point adjustment can be performed only by Rz.
【００１４】以上述べたようにレベル信号入力とゼロ点
調整信号入力を独立させることにより、ゼロ点調整範囲
はＲｚとＲ2 の値の選択や取り付け位置をかえることに
より任意にできる。[0014] By independent on the level signal input and zero point adjustment signal input as mentioned above, the zero point adjustment range can arbitrarily by varying the selection and mounting position of the value of Rz and R 2.
【００１５】図３は本発明のゼロ点とスパン点の調整範
囲例をグラフで示したものである。横軸はレベル信号０
％におけるゼロ点表示の調整範囲を示す。また、縦軸は
レベル信号１００％におけるスパン点表示の調整範囲を
示す。図中の点線で示す範囲は従来装置の調整範囲（±
２.５ｍ ）を示し、実線は本発明の調整範囲を示す。本
発明の例ではゼロ点表示の調整範囲が−５０ｍ〜５０ｍ
まで可能で、スパン点も最大で６５ｍまで変えられる。
但し、この例ではスパン点表示の最大が５０ｍにしてあ
るためゼロ点が−１５ｍ以上ではスパン調整範囲が狭く
なっている。なお、レベル表示の最大は計器精度が０.
２から０.５％であるため３1/2 桁が一般的である。FIG. 3 is a graph showing an example of the adjustment range of the zero point and the span point according to the present invention. The horizontal axis is level signal 0
The adjustment range of the zero point display in% is shown. The vertical axis indicates the adjustment range of the span point display at the level signal of 100%. The range indicated by the dotted line in the figure is the adjustment range (±
2.5 m), and the solid line indicates the adjustment range of the present invention. In the example of the present invention, the adjustment range of the zero point display is −50 m to 50 m.
The span point can be changed up to 65m.
However, in this example, since the maximum of the span point display is set to 50 m, the span adjustment range is narrow when the zero point is -15 m or more. In addition, the maximum of the level display is the instrument accuracy of 0.
Since it is 2 to 0.5%, 3 1/2 digits are common.
【００１６】[0016]
【発明の効果】以上のように、本発明によれば、実目盛
表示が可能な２線式デジタル表示器が短期間で安価に得
られる。As described above, according to the present invention, a two-wire digital display capable of displaying actual scales can be obtained in a short time and at low cost.
【図１】本発明の実施例である水位計の回路を示す図で
ある。FIG. 1 is a diagram showing a circuit of a water level meter according to an embodiment of the present invention.
【図２】従来装置を示す図である。FIG. 2 is a diagram showing a conventional device.
【図３】本発明のゼロ点とスパン点の調整範囲を説明す
るグラフである。FIG. 3 is a graph illustrating an adjustment range of a zero point and a span point according to the present invention.
１…検出器、２…変換器、３…電線、４…パイプ、５…
中空ケーブル、６…水中、７…表示器、８…電源、９…
プラス入力端子、９′…マイナス入力端子、１０…ＤＣ
／ＤＣ変換器、１１…演算器、１２…コンピュータ、１
３…液晶表示器、１４…信号電流検出器抵抗、１５…可
変抵抗Ｒｖ、１６…スパン調整抵抗Ｒｐ、１７…固定抵
抗Ｒ1 、１８…定電圧発生器、１９…ゼロ点調整抵抗Ｒ
ｚ、２０…固定抵抗Ｒ2 。DESCRIPTION OF SYMBOLS 1 ... Detector, 2 ... Converter, 3 ... Electric wire, 4 ... Pipe, 5 ...
Hollow cable, 6 ... underwater, 7 ... display, 8 ... power supply, 9 ...
Positive input terminal, 9 '... negative input terminal, 10 ... DC
/ DC converter, 11 arithmetic unit, 12 computer, 1
3 ... liquid crystal display device, 14 ... signal current detector resistor, 15 ... variable resistor Rv, 16 ... span adjustment resistor Rp, 17 ... fixed resistance R 1, 18 ... constant voltage generator, 19 ... zero-point adjustment resistor R
z, 20... fixed resistance R 2 .
Claims (8)
比例したデジタル表示のレベルを表示する２線式デジタ
ル表示器を有する水位計において、レベル表示のスパン
調整量とゼロ点調整量がほぼ同等でゼロ点表示がマイナ
スからプラスの範囲であることを特徴とする水位計。In a water level meter having a two-wire digital display for displaying a level of a digital display proportional to an output signal using an output signal of the water level meter as a power source, a span adjustment amount and a zero point adjustment amount of the level display are substantially equal. A water level gauge having an equivalent zero point range from minus to plus.
比例したデジタル表示のレベルを表示する２線式デジタ
ル表示器を有する水位計において、ゼロ点信号時のレベ
ルがマイナス表示で測定スパンと絶対値がほぼ同じ値で
あることを特徴とする水位計。2. A water level meter having a two-wire digital display for displaying a digital display level proportional to an output signal using an output signal of the water level meter as a power source. A water level gauge characterized in that the absolute values are almost the same.
式水位計であることを特徴とする水位計。3. The water level gauge according to claim 1, wherein the water level gauge is a flush type water level meter.
４〜２０ｍＡであることを特徴とする水位計。4. An output signal according to claim 1, wherein the output signal is DC.
A water level gauge characterized by being 4 to 20 mA.
信号のレベル表示を独立して調整できる設定機能を有す
ることを特徴とする水位計。5. The water level gauge according to claim 1, further comprising a setting function capable of independently adjusting the level display of the minimum signal and the maximum signal.
信号のレベル表示がともにマイナスであることを特徴と
する水位計。6. The water level meter according to claim 1, wherein the level indications of the minimum signal and the maximum signal are both negative.
負の極性と３1/2 桁の数字表示であることを特徴とする
水位計。7. The water level meter according to claim 1, wherein the level display is a positive / negative polarity and a 31/2 digit number display.
デジタル表示のレベルを表示する２線式デジタル表示器
を有する水位計において、２線式デジタル表示器がＤＣ
／ＤＣ変換器と演算器，コンピュータ，液晶表示器から
構成され、演算器へのレベル信号のゼロ点調整信号を独
自に入力したことを特徴とする水位計。8. A water level gauge having a two-wire digital display for displaying a level of a digital display proportional to the input signal using the input signal as a power supply, wherein the two-wire digital display is DC.
A water level meter comprising a / DC converter, a computing unit, a computer, and a liquid crystal display, and independently inputting a zero-point adjustment signal of a level signal to the computing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238101A JP2000065625A (en) | 1998-08-25 | 1998-08-25 | Water level gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238101A JP2000065625A (en) | 1998-08-25 | 1998-08-25 | Water level gage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000065625A true JP2000065625A (en) | 2000-03-03 |
Family
ID=17025198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10238101A Pending JP2000065625A (en) | 1998-08-25 | 1998-08-25 | Water level gage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000065625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103282752A (en) * | 2011-12-22 | 2013-09-04 | 罗斯蒙德公司 | Two-wire process variable indicator with microencapsulated electrophoretic display |
-
1998
- 1998-08-25 JP JP10238101A patent/JP2000065625A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103282752A (en) * | 2011-12-22 | 2013-09-04 | 罗斯蒙德公司 | Two-wire process variable indicator with microencapsulated electrophoretic display |
| JP2015504156A (en) * | 2011-12-22 | 2015-02-05 | ローズマウント インコーポレイテッド | Two-wire process variable indicator with microcapsule type electrophoretic display |
| US9429462B2 (en) | 2011-12-22 | 2016-08-30 | Rosemount Inc. | Two-wire process variable indicator with microencapsulated electrophoretic display |
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