JPS6360848B2 - - Google Patents
Info
- Publication number
- JPS6360848B2 JPS6360848B2 JP57053586A JP5358682A JPS6360848B2 JP S6360848 B2 JPS6360848 B2 JP S6360848B2 JP 57053586 A JP57053586 A JP 57053586A JP 5358682 A JP5358682 A JP 5358682A JP S6360848 B2 JPS6360848 B2 JP S6360848B2
- Authority
- JP
- Japan
- Prior art keywords
- input
- terminal
- resistance
- resistance temperature
- temperature detector
- 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
- 239000007788 liquid Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000012827 research and development Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【発明の詳細な説明】
本発明はタンクやタンカー等に収容されている
原油や重油等の実質液量の計測回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for measuring the actual amount of liquid such as crude oil or heavy oil contained in a tank, tanker, or the like.
原油や重油は温度の変化に伴つてその体積が変
化するので、収容されている液の数点から温度を
検出してその平均値を算出し、基準温度の体積に
換算して実質液量を計測することが行なわれてい
る。 The volume of crude oil and heavy oil changes as the temperature changes, so the temperature is detected from several points in the contained liquid, the average value is calculated, and the actual liquid volume is calculated by converting it to the volume at the reference temperature. Measurements are being taken.
一般的にこの平均温度の計測については、例え
ば第１図乃至第３図に示す如き回路を構成して行
なわれている。 Generally, the average temperature is measured by configuring a circuit as shown in FIGS. 1 to 3, for example.
図中１は測温抵抗体を示し、この測温抵抗体１
が抵抗２，３，４と組んでブリツジを構成してい
る。また、図中５は電源で、この電源５によつて
出力がＰ，Ｑ点に加えられ、測温抵抗体１の温度
変化に対応する抵抗変化はＲ，Ｓ点によつて電圧
変化として検出される。さらに、測温抵抗体１と
ブリツジ間の距離が長い場合、導線の抵抗R1，
R2，R3が無視でき得ない値となつたときでもR2
＝R3となるように導線抵抗を調整することによ
つて計測値はR2，R3の直接的影響を受けないよ
うになつている。 In the figure, 1 indicates a resistance temperature detector, and this resistance temperature detector 1
is combined with resistors 2, 3, and 4 to form a bridge. In addition, 5 in the figure is a power supply, and this power supply 5 applies output to points P and Q, and the resistance change corresponding to the temperature change of the resistance temperature detector 1 is detected as a voltage change at points R and S. be done. Furthermore, if the distance between the resistance temperature detector 1 and the bridge is long, the resistance of the conductor R 1 ,
Even when R 2 and R 3 reach values that cannot be ignored, R 2
By adjusting the conductor resistance so that = R 3 , the measured value is not directly influenced by R 2 and R 3 .
この３線ブリツジ回路に２以上の測温抵抗体を
接続する場合は、第２図に示す如く、各々の測温
抵抗体からそれぞれ３芯ケーブルをブリツジ側に
引き込んで、一つのブリツジで直接多数点の測温
抵抗体の平均値を求め得るように接続することは
不可能で、必ずブリツジを複数個分用意して、各
ブリツジの出力後に平均値を算出する必要があ
る。 When connecting two or more RTDs to this 3-wire bridge circuit, as shown in Figure 2, connect 3-core cables from each RTD to the bridge side, and connect multiple RTDs directly to one bridge. It is impossible to connect so that the average value of the temperature measuring resistor at a point can be determined, and it is necessary to prepare a plurality of bridges and calculate the average value after each bridge outputs.
あるいは第３図に示す如く、測温抵抗体１，１
ａ間を３芯ケーブルで結び、その３芯ケーブルの
一芯６を測温抵抗体１，１ａが直列となるように
結線し、他の二芯７，８は測温抵抗体１のＢ，ｂ
端子より一芯６と同じ経路を通り、測温抵抗体１
ａの中継端子Ｃ，Ｄで中継して更に３芯ケーブル
９，１０，１１によりブリツジへ接続することも
ある。 Alternatively, as shown in FIG.
A is connected with a 3-core cable, and one core 6 of the 3-core cable is connected so that the resistance temperature detectors 1 and 1a are connected in series, and the other two cores 7 and 8 are connected to B and B of the resistance temperature detector 1. b
Pass through the same route as one wire 6 from the terminal, and connect the resistance temperature detector 1.
It may be relayed by relay terminals C and D of a and further connected to the bridge by three-core cables 9, 10, and 11.
ケーブル６，７，８を同じ経路とするのはこの
３本のケーブルの抵抗を等しくするためであり、
同様にケーブル９，１０，１１も抵抗が等しくせ
ねばならない。 The reason why cables 6, 7, and 8 are routed the same way is to equalize the resistance of these three cables.
Similarly, cables 9, 10, and 11 must also have equal resistance.
しかしながら、このような構成とした場合には
測温抵抗体１ａに余分な中継端子Ｃ，Ｄが必要と
なり、現場における計装工事上はこの些細な特殊
性が大幅なコストアツプの要因となつてしまう。 However, with such a configuration, extra relay terminals C and D are required for the resistance temperature detector 1a, and this trivial peculiarity becomes a factor in significantly increasing costs when it comes to on-site instrumentation work. .
そこで、本発明はかかる諸点に着目してなされ
たもので、複数個の測温抵抗体を用いて平均温度
を計測するについて、該当数だけのブリツジを用
意したり、中継端子等の特殊な要素を必要とせず
に、測温抵抗体からの温度信号の平均値の算出を
直接的に行うことにより実質液量の計測回路を提
供できるようにした。 Therefore, the present invention has been made with attention to these points, and in order to measure the average temperature using a plurality of resistance temperature sensors, it is necessary to prepare the corresponding number of bridges, or to use special elements such as relay terminals. By directly calculating the average value of the temperature signal from the resistance temperature sensor without requiring a circuit, it is possible to provide a circuit for measuring the actual liquid amount.
次に、本発明の実施の一例を第４図乃至第７図
を参照して説明する。 Next, an example of the implementation of the present invention will be described with reference to FIGS. 4 to 7.
図中１，１ａ，１ｂはそれぞれ抵抗ｒ―１，ｒ
―ａ，ｒ―ｂを備え、しかも各抵抗の両端にそれ
ぞれＡ，Ｂ端子を有する第１、第２、第３の測温
抵抗体を示す。 In the figure, 1, 1a, and 1b are resistances r-1 and r, respectively.
-a, r-b, and has first, second, and third temperature measuring resistors having A and B terminals at both ends of each resistor, respectively.
第１測温抵抗体１のＢ端子は変換器のP1〜P7
端子中のP1の端子に接続され、このP1端子は抵
抗１３を介してアースされている。 The B terminal of the first resistance temperature detector 1 is connected to P 1 to P 7 of the converter.
It is connected to the P 1 terminal among the terminals, and this P 1 terminal is grounded via a resistor 13 .
しかして抵抗１３は測温抵抗体の数へ測温抵抗
体の基準温度における抵抗値を乗じた積の値のも
のとしてある。 Therefore, the resistor 13 has a value equal to the product of the number of temperature-measuring resistors multiplied by the resistance value of the temperature-measuring resistors at the reference temperature.
第１〜第３測温抵抗体は互いに直列に接続され
ている。 The first to third resistance temperature detectors are connected in series with each other.
すなわち、第１測温抵抗体１のＡ端子は変換器
の直列接続用のP3端子を介して第２測温抵抗体
１ａのＢ端子へ接続され、第２測温抵抗体１ａの
Ａ端子は変換器の直列接続用端子P5を介して第
３測温抵抗体１ｂのＢ端子へ接続されており、第
３測温抵抗体１ｂのＡ端子は変換器の終端端子
P7を介して定電流電源１２に接続されている。 That is, the A terminal of the first resistance temperature detector 1 is connected to the B terminal of the second resistance temperature detector 1a via the P3 terminal for series connection of the converter, and the A terminal of the second resistance temperature detector 1a is connected to the A terminal of the second resistance temperature detector 1a. is connected to the B terminal of the third resistance temperature detector 1b via the series connection terminal P5 of the converter, and the A terminal of the third resistance temperature detector 1b is the terminal terminal of the converter.
It is connected to constant current power supply 12 via P7 .
また、第１、第２、第３の各測温抵抗体におけ
る各抵抗ｒ―１，ｒ―ａ，ｒ―ｂと各Ｂ端子間に
はそれぞれ中間ｂ端子を設けてあつて、それぞれ
の中間ｂ端子を変換器の端子P2，P4，P6へ接続
してある。 In addition, an intermediate b terminal is provided between each resistor r-1, r-a, r-b and each B terminal in the first, second, and third resistance temperature detectors. The b terminal is connected to terminals P 2 , P 4 , and P 6 of the converter.
なお、各測温抵抗体のＡ，Ｂ，ｂの各端子と変
換器の端子P1〜P7を接続する３芯ケーブルは抵
抗が等しくなるように調整されており、仮りにア
ンバランスになつたときには可変抵抗を組み入れ
て調整する。 Note that the three-core cables that connect terminals A, B, and b of each resistance temperature detector and terminals P 1 to P 7 of the converter are adjusted so that their resistances are equal, so if they become unbalanced, If necessary, adjust by incorporating a variable resistor.
なお、符号E1〜E7は変換器の各端子P1〜P7点
における電圧を示す。 Note that symbols E 1 to E 7 indicate voltages at respective terminals P 1 to P 7 of the converter.
このような測温抵抗体群の各端子からの出力信
号は第５図に示す演算回路に入力される。 The output signals from each terminal of such a group of resistance temperature detectors are input to an arithmetic circuit shown in FIG.
すなわち、端子P2，P4，P6からの出力信号は
第５図の増巾器における反転側入力端子（負側端
子）へe2信号として入力され、端子P3，P5，P7
からの出力信号は非反転側入力端子（正側端子）
へe1信号として入力される。 That is, the output signals from terminals P 2 , P 4 , and P 6 are input as e 2 signals to the inverting side input terminal (negative side terminal) of the amplifier shown in FIG.
The output signal from is the non-inverting side input terminal (positive side terminal)
input as e1 signal.
ここで各測温抵抗体の抵抗は各々基準温度にお
ける測温抵抗体の抵抗（RT0）と基準温度と測定
温度の差に対する測温抵抗体の抵抗変化分
（ΔRT1〜3）とを加えた値となり、変換器の各端
子P1〜P7における電圧E1〜E7の関係は
E3−E1＝（RT0＋ΔRT1）Ｉ＋2R1I
＝（RT0＋ΔRT1）Ｉ＋２（E2−E1）
即ち、
（RT0＋ΔRT1）Ｉ＝E3−E1−２（E2−E1）
…(1)式
同様にして
（RT0＋ΔRT2）Ｉ＝E5−E3−２（E4−E3）
…(2)式
（RT0＋ΔRT3）Ｉ＝E7−E5−２（E6−E5）
…(3)式
(1)，(2)，(3)式より
（RT0＋ΔRT1＋RT0＋ΔRT2
＋RT0＋ΔRT3）Ｉ
＝E3−E1−２（E2−E1）
＋E5−E3−２（E4−E3）
＋E7−E5−２（E6−E5）
となり、即ち、
（3RT0＋ΔRT1＋ΔRT2＋ΔRT3）Ｉ
＝E1−2E2＋2E3−2E4＋2E5−2E6＋E7…(4)式
ここで抵抗１３をRxとすればE1＝IRxであるか
らRx＝3RT0とおけば
E1＝3RT0 …(5)式
となり、(5)式を(4)式に代入して整理すると
（ΔRT1＋ΔRT2＋ΔRT3）Ｉ
＝２（E3−E2）＋２（E5−E4）−2E6＋E7 …(6)式
となる。 Here, the resistance of each RTD is calculated by adding the resistance of the RTD at the reference temperature (RT 0 ) and the change in resistance of the RTD due to the difference between the reference temperature and the measured temperature (ΔRT 1 to 3 ). The relationship between the voltages E 1 to E 7 at each terminal P 1 to P 7 of the converter is E 3 −E 1 = (RT 0 +ΔRT 1 )I+2R 1 I = (RT 0 +ΔRT 1 )I+2(E 2 −E 1 ) That is, (RT 0 +ΔRT 1 )I=E 3 −E 1 −2(E 2 −E 1 )
…Similarly to equation (1), (RT 0 +ΔRT 2 )I=E 5 −E 3 −2(E 4 −E 3 )
…(2) Formula (RT 0 +ΔRT 3 )I=E 7 −E 5 −2(E 6 −E 5 )
…(3) From formulas (1), (2), and (3) (RT 0 +ΔRT 1 +RT 0 +ΔRT 2 +RT 0 +ΔRT 3 )I = E 3 −E 1 −2 (E 2 −E 1 ) +E 5 −E 3 −2(E 4 −E 3 ) +E 7 −E 5 −2(E 6 −E 5 ), that is, (3RT 0 +ΔRT 1 +ΔRT 2 +ΔRT 3 )I =E 1 −2E 2 +2E 3 − 2E 4 +2E 5 −2E 6 +E 7 ...Equation (4) Here, if the resistor 13 is Rx, E 1 = IRx, so if Rx = 3RT 0 , E 1 = 3RT 0 ...Equation (5), ( Substituting equation 5) into equation (4) and rearranging (ΔRT 1 +ΔRT 2 +ΔRT 3 )I = 2(E 3 −E 2 )+2(E 5 −E 4 )−2E 6 +E 7 …(6) equation becomes.
一方、第５図に示すのは演算回路であり、
（E3−e1／R0＋E5−e1／R0＋Ｏ−e1／R0＋E7−e1／2R
0）R1
＋Eovt＝e1 …(7)式
（E2−e2／R0＋E4−e2／R0＋E6−e2／R0＋Ｏ−e1／2R
0）R1＝
e2 …(8)式
ここで演算増幅器における入力条件から
e1＝e2 …(9)式
が成立するので、これによつて(7)，(8)式を整理す
ると、
Eout＝R1／2R0｛２（E3−E2）
＋２（E5−E4）−2E6＋E7｝ …(10)式
この(10)式は第４図＝第５図のE2〜E7の対応す
る入出力を接続して第５図に示す演算器によつて
E2〜E7を演算すると、(6)，(10)式は同時に成立す
ることとなり、この条件に基いて(6)，(10)式を整理
すると
Eout＝IR1／2R0（ΔRT1＋ΔRT2＋ΔRT3） …(11)式
が導かれる。 On the other hand , what is shown in FIG .
0 ) R 1 +Eovt=e 1 ...Equation (7) (E 2 −e 2 /R 0 +E 4 −e 2 /R 0 +E 6 −e 2 /R 0 +O−e 1 /2R
0 ) R 1 = e 2 ...Equation (8) Here, e 1 = e 2 ...Equation (9) holds true from the input conditions in the operational amplifier, so by rearranging Equations (7) and (8), , Eout=R 1 /2R 0 {2(E 3 −E 2 ) +2(E 5 −E 4 )−2E 6 +E 7 } …Equation (10) This equation (10) is shown in Figure 4 = Figure 5. Connect the corresponding inputs and outputs of E 2 to E 7 and use the arithmetic unit shown in Figure 5.
When E 2 to E 7 are calculated, equations (6) and (10) will hold true at the same time. If we rearrange equations (6) and (10) based on this condition, Eout=IR 1 /2R 0 (ΔRT 1 +ΔRT 2 +ΔRT 3 ) ...Equation (11) is derived.
第６図は測温抵抗体をＮ個直列に接続した状態
であり、各測温抵抗体の抵抗をアース接続側から
順次
RT0＋ΔRT1，RT0＋ΔRT2，RT0＋ΔRT3…
RT0＋ΔRTN―1，RT0＋ΔRTN
とした時の一般式は
Ｉ・N
〓n=1
RTN＝２N
〓n=1
（E2(o-1)+1
−E2(o-1)）−2E1−2E2N＋E2N+1 …(12)式
ここで、Ｎ及びｎは不特定の自然数を表す。ま
た、第６図における接地抵抗Rxは、Rx＝NRT0
となるように選定してある。 Figure 6 shows a state in which N resistance temperature detectors are connected in series, and the resistance of each resistance temperature detector is sequentially determined from the grounded side as R T0 +ΔR T1 , R T0 +ΔR T2 , R T0 +ΔR T3 ... R T0 +ΔR The general formula when TN ― 1 , R T0 + ΔR TN is I・N 〓 n=1 R TN = 2 N 〓 n=1 (E 2(o-1)+1 −E 2(o-1) ) -2E 1 -2E 2N +E 2N+1 ...Equation (12) Here, N and n represent unspecified natural numbers. Also, the grounding resistance Rx in Figure 6 is Rx=NR T0
It has been selected so that.
第７図は第６図の測温抵抗体群を接続する演算
回路を示すものであり、第６図の出力端子と第７
図の入力端子の端子電圧が対応するもの同士を接
続する。 Figure 7 shows an arithmetic circuit that connects the resistance temperature detector group in Figure 6, and connects the output terminals in Figure 6 and the
Connect the input terminals in the figure whose terminal voltages correspond.
この入出力関係を示す式は
Eout＝R1／2R0｛２N
〓n=1
（E2(o-1)+1
−E2(o-1)）−2E1−2E2N＋E2N+1｝ …（13）式
となり(12)，（13）式より測温抵抗体をＮ個接続し
た場合の演算回路出力の式は
Eout＝IR1／2R0N
〓n=1
ΔRTo …（14）式
となる。 The formula showing this input/output relationship is Eout=R 1 /2R 0 {2 N 〓 n=1 (E 2(o-1)+1 −E 2(o-1) )−2E 1 −2E 2N +E 2N+ 1 } ...Equation (13) becomes, and from Equations (12) and (13), the formula for the arithmetic circuit output when N resistance temperature detectors are connected is Eout=IR 1 /2R 0N 〓 n=1 ΔR To ...(14 ).
(11)式と（14）式から、演算回路の出力Eoutは
Ｎ個の測温抵抗体の温度計測値の総和にIR1／
2R0を乗じた値であることを示している。 From equations (11) and (14), the output Eout of the arithmetic circuit is the sum of the temperature measurement values of N resistance temperature sensors plus IR 1 /
It shows that it is a value multiplied by 2R 0 .
但し、Ｉは定電流電源の電流値、R0，R1は
各々演算回路の回路定数を示しており、定電流電
源と演算回路が決まるとIR1／2R0は一定値とな
る。 However, I represents the current value of the constant current power supply, R 0 and R 1 each represent the circuit constant of the arithmetic circuit, and when the constant current power supply and the arithmetic circuit are determined, IR 1 /2R 0 becomes a constant value.
したがつて、定電流電源の電流値と演算回路の
回路定数を適宜に選択することによつてIR1／
2R0＝１／Ｎとすれば、計測した温度の平均値出
力が直接的に得られることを意味している。 Therefore, IR 1 /
If 2R 0 =1/N, it means that the average value output of the measured temperature can be directly obtained.
本発明は上述の如く構成したものであり、一般
的な３線式測温抵抗体を多数用いて多点の測温を
行わせると同時に、それらの平均温度を直接出力
させることが可能で、しかも特殊な要素、配線は
一切不要である。 The present invention is configured as described above, and it is possible to measure temperatures at multiple points using a large number of general 3-wire resistance temperature sensors, and at the same time directly output the average temperature. Moreover, no special elements or wiring are required.
また、各測温抵抗体のＡ，ｂ，Ｂ端子から変換
器への３芯ケーブルの抵抗値を一度等しく調整し
ておくと、その後温度変化等により生じる各ケー
ブルの均等な抵抗変化は、回路内で相殺されて自
動的に補正されることとなり、ケーブル抵抗の絶
対値に左右されることなく極めて高精度な計測を
行える。 In addition, once the resistance values of the three-core cables from the A, b, and B terminals of each resistance temperature detector to the converter are adjusted to be equal, the equal resistance changes of each cable caused by temperature changes, etc. This allows for extremely high precision measurements to be made without being influenced by the absolute value of the cable resistance.
さらにケーブル回路と比較すると直線性が良好
で、導線抵抗が直線性の関数となる現象は一切生
じることもないので、演算回路構成も非常に簡単
なもので済み、需要者にも低廉な価格で供給する
ことができる。 Furthermore, compared to cable circuits, linearity is better, and there is no phenomenon where conductor resistance is a function of linearity, so the arithmetic circuit configuration can be extremely simple, and it is inexpensive for consumers. can be supplied.
第１図乃至第３図は従来の方法を示す回路図、
第４図は本発明の実施の一例を示し、測温抵抗体
３個使用した場合の概略結線図、第５図は同演算
回路図、第６図は同測温抵抗体をＮ個使用した場
合の一般的な結線図、第７図は同演算回路図であ
る。
図中、１，１ａ，１ｂ…測温抵抗体、１２…定
電流電源、１３…抵抗、P1〜P7…変換器端子、
E1〜E7…電圧。
1 to 3 are circuit diagrams showing the conventional method,
Fig. 4 shows an example of the implementation of the present invention, and is a schematic wiring diagram when three resistance temperature detectors are used. Fig. 5 is a circuit diagram of the same operation circuit. Fig. 6 is a schematic connection diagram when three resistance temperature detectors are used. FIG. 7 is a general wiring diagram for this case, and is a diagram of the same calculation circuit. In the figure, 1, 1a, 1b... resistance temperature detector, 12... constant current power supply, 13... resistor, P1 to P7 ... converter terminal,
E1 to E7 ...Voltage.
Claims (1)
体群の第１測温抵抗体の一端をアースし、同第１
測温抵抗体の他端は第２測温抵抗体の一端へ、同
第２測温抵抗体の他端は第３測温抵抗体へとそれ
ぞれ直列接続用端子を介して順次接続して、Ｎ番
目の測温抵抗体の終端端子を定電流電源に接続す
るとともに、各測温抵抗体の低電位側端子とほぼ
同電位となる点から中間端子を引き出した測温抵
抗体群と、更に入力抵抗R0を有するＮ個の入力
端子及び入力抵抗2R0を有する１個の入力端子と
からなる入力端子群を、帰還抵抗及び補償抵抗を
R1とした演算増巾器の反転側、非反転側入力へ
それぞれ接続してなる演算回路とを備え、かつ演
算回路の反転側入力の入力抵抗R0を有するＮ個
の入力端子群へ、各測温抵抗体どうしを接続した
Ｎ―１個の端子をそれぞれ接続して、残る１個の
入力抵抗R0の端子はアースし、入力抵抗2R0の入
力端子にはＮ番目の測温抵抗体の終端端子を接続
し、また演算回路の非反転側入力の入力抵抗R0
を有するＮ個の入力端子へ、各測温抵抗体の中間
端子Ｎ個をそれぞれ接続して、残る入力抵抗2R0
を有する入力端子は接地してなる実質液量の計測
回路。1. Ground one end of the first resistance temperature detector of a group of N resistance temperature detectors each having a resistance, and
The other end of the resistance temperature detector is connected to one end of the second resistance temperature detector, and the other end of the second resistance temperature detector is connected to the third resistance temperature detector, respectively, through series connection terminals, A group of resistance temperature detectors in which the terminal terminal of the Nth resistance temperature detector is connected to a constant current power supply, and the intermediate terminal is drawn out from a point that has approximately the same potential as the low potential side terminal of each resistance temperature detector; An input terminal group consisting of N input terminals with input resistance R 0 and one input terminal with input resistance 2R 0 is connected to a feedback resistor and a compensation resistor.
and an arithmetic circuit connected to the inverting side and non-inverting side inputs of an operational amplifier set as R 1 , respectively, and to a group of N input terminals having an input resistance R 0 of the inverting side input of the arithmetic circuit; Connect the N-1 terminals of each RTD connected to each other, ground the terminal of the remaining input resistor R 0 , and connect the Nth RTD to the input terminal of input resistor 2R 0 . Connect the terminal terminal of the body, and also the input resistance R 0 of the non-inverting side input of the arithmetic circuit.
Connect the N intermediate terminals of each resistance temperature sensor to the N input terminals having the remaining input resistance 2R 0
A circuit for measuring the actual liquid volume whose input terminal is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57053586A JPS58169039A (en) | 1982-03-31 | 1982-03-31 | Substantial liquid measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57053586A JPS58169039A (en) | 1982-03-31 | 1982-03-31 | Substantial liquid measuring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58169039A JPS58169039A (en) | 1983-10-05 |
| JPS6360848B2 true JPS6360848B2 (en) | 1988-11-25 |
Family
ID=12946954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57053586A Granted JPS58169039A (en) | 1982-03-31 | 1982-03-31 | Substantial liquid measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58169039A (en) |
-
1982
- 1982-03-31 JP JP57053586A patent/JPS58169039A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58169039A (en) | 1983-10-05 |
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