JPS5956127A - Temperature measuring instrument - Google Patents
Temperature measuring instrumentInfo
- Publication number
- JPS5956127A JPS5956127A JP16738482A JP16738482A JPS5956127A JP S5956127 A JPS5956127 A JP S5956127A JP 16738482 A JP16738482 A JP 16738482A JP 16738482 A JP16738482 A JP 16738482A JP S5956127 A JPS5956127 A JP S5956127A
- Authority
- JP
- Japan
- Prior art keywords
- resistance
- circuit
- temperature
- standard resistor
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
- G01K7/206—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit in a potentiometer circuit
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】 た温度計測器に関する。[Detailed description of the invention] related to temperature measuring instruments.
一般的な温度計測器は、第１図に示すように、側温抵抗
体２１を一辺とした３線式ブリッジ回路を構成し、測温
抵抗体２ｌの温度変化に対応する抵抗変化によって生ず
るブリッジ回路の不平衡電圧を電圧計２２で検出すると
いう構成になっている。なお第１図中２３は定電流源、
２４は伝送ケーブルである。As shown in Fig. 1, a general temperature measuring instrument constitutes a three-wire bridge circuit with a side temperature resistor 21 on one side, and the bridge is generated by a change in resistance corresponding to a change in temperature of the resistance temperature detector 2l. The configuration is such that a voltmeter 22 detects the unbalanced voltage in the circuit. In addition, 23 in Fig. 1 is a constant current source,
24 is a transmission cable.
この種の温度計測器は、３線ブリッジ回路を構成するこ
とによって伝送ケーブルの導線抵抗を一応無視できるが
、厳密には出力のリラヤリティ、・スパン等に影響が生
じ、伝送ケーブルを含めた現場設置状態での再調整を必
要とし、これによってもリニャリティーの悪化は防げら
れず、しかも伝送ケーブルは長くなってしまうためノイ
ズの混入による誤差も生じ、ノイズ除去フィルタ一定数
を大きくする必要性から高速のデータ採取は不可能とな
っている。This type of temperature measuring instrument can ignore the conductor resistance of the transmission cable by configuring a 3-wire bridge circuit, but strictly speaking, it affects the output reliability, span, etc. readjustment is required, and even this does not prevent deterioration of linearity.Moreover, the transmission cable becomes longer, which causes errors due to noise intrusion, and the need to increase the number of noise removal filters increases the speed of high-speed transmission. Data collection is not possible.
また第２図に示すように、ブリッジを現場に設置して伝
送ケーブル２４ａを短＜シ、変換器２５を組み込んで、
ブリッジの不平衡電圧をその場で信号変換し、４〜２０
ｍＡｓ度のディジクル信号として受信計に伝送する形式
のものもあるが、この場合は、ブリッジ、変換器等が温
度条件等環境の悪い現場に設置されているため、部品全
てを温度特性の良いものを選択したとしても、周囲温度
の大幅な変化に伴なう回路構成素子自体の温度変化によ
る誤差が生じ易いものとなっている。Further, as shown in FIG. 2, a bridge is installed at the site, the transmission cable 24a is shortened, the converter 25 is installed,
The unbalanced voltage of the bridge is converted into a signal on the spot, and 4 to 20
There is also a format that transmits a digital signal of mAs degrees to the receiver, but in this case, the bridge, converter, etc. are installed in a site with poor temperature conditions, so all components must have good temperature characteristics. Even if this is selected, errors are likely to occur due to temperature changes in the circuit components themselves due to large changes in ambient temperature.
本発明は斯かる諸点に着目してなされたもので、温度条
件の悪い現場に設置しても高精度な温度計測を可能とし
た温度計測器を提供できるようにした。しかしてその要
旨とするところは、側温抵抗体と標準抵抗体とを並列配
置した抵抗温度計と、前記測温抵抗体と標準抵抗体の抵
抗値の比を時間比に変換する積分回路とからなる温度ｉ
ｔ測器に存する。The present invention has been made with attention to these points, and has made it possible to provide a temperature measuring instrument that can measure temperature with high precision even when installed at a site with poor temperature conditions. However, the gist of this is a resistance thermometer in which a side-temperature resistance element and a standard resistance element are arranged in parallel, and an integrating circuit that converts the ratio of the resistance values of the temperature-detecting resistance element and the standard resistance element into a time ratio. temperature i consisting of
It exists in the t measuring instrument.
次に、本発明の実施の一例を第３図、第４図を参照して
説明する。Next, an example of implementation of the present invention will be described with reference to FIGS. 3 and 4.
図中１は抵抗温度計であり、この抵抗温度計１は一般的
なＰｔ１．０Ｏｆ１等の測温抵抗体２と標準抵抗体３が
並列配置で組み込まれている。In the figure, reference numeral 1 denotes a resistance thermometer, and this resistance thermometer 1 incorporates a temperature measuring resistor 2 such as a general Pt1.0Of1 and a standard resistor 3 arranged in parallel.
この抵抗温度計１の測温抵抗体２と標準抵抗体３には定
電流源４からスイッチ５を介して定電流が供給されるも
のとなっている。A constant current is supplied from a constant current source 4 to the temperature measuring resistor 2 and standard resistor 3 of the resistance thermometer 1 via a switch 5.
定電流回路の出力電流をＩＯとし、スイッチ５が測温抵
抗体２又は標準抵抗側に切り換っている場合の図中Ｐ点
の電圧Ｖｐはそれぞれ次のようになる。When the output current of the constant current circuit is IO and the switch 5 is switched to the resistance temperature detector 2 or standard resistance side, the voltage Vp at point P in the figure is as follows.
Ｖｐ ＝Ｖｔ ＝（Ｒｏ＋４ＲＴ） Ｉｏ 、、９
．、、■Ｖｐ ＝Ｖｓ ＝ Ｒ’ｏＩｏ 、
、、、、、 （２）ここで、ｈは基準温度に於る測温抵
抗体２の抵抗、乙Ｒは測温抵抗体２の温度係数（Ω１０
Ｃ）、Ｔは基準温度からの温度差、ＲＩＯは標準抵抗体
３の抵抗である。Vp = Vt = (Ro+4RT) Io,, 9
．． ,, ■Vp = Vs = R'oIo,
,,,,, (2) Here, h is the resistance of the resistance temperature detector 2 at the reference temperature, and R is the temperature coefficient of the resistance temperature detector 2 (Ω10
C), T is the temperature difference from the reference temperature, and RIO is the resistance of the standard resistor 3.
また、図中６は極性変換回路であり、７の計測制御回路
がスイッチ５を測温抵抗体２ （Ｅｌ！ｌに切り挨えて
いる場合に正極性、標準抵抗体３側に切り換えている場
合には負極性となるようになっている。In addition, 6 in the figure is a polarity conversion circuit, and when the measurement control circuit 7 is switching the switch 5 to the resistance temperature detector 2 (El!l), it is positive polarity, and when it is switching it to the standard resistor 3 side, it is It is designed to have negative polarity.
すなわち、図中Ｑ点の電位■０は測温抵抗体２側に切り
換っている場合、標準抵抗体３側に切り換っている場合
にそれぞれ次のようになる。That is, the potential 0 at point Q in the figure is as follows when switching to the temperature-measuring resistor 2 side and when switching to the standard resistor 3 side, respectively.
Ｖａ＝Ｖｔ ＝（ｒ（ｏ ＋ａＲＴ） Ｉｏ
、、、、、、■Ｖａ＝−Ｖｓ＝ −Ｒ’ｏ Ｉｏ
、１０．、、■また、図中８は電流変換回路で
あり、図中Ｑ点の電圧に比例した定電流を発律する機能
を有し、その電流は測温抵抗体２側に切り換えの場合な
Ｉｔ、標準抵抗体３側に切り換えの場合をＩｓとすると
それぞれ次のようになる。Va=Vt=(r(o+aRT)Io
, , , , ■Va=-Vs=-R'o Io
, 10. ,,■ In addition, 8 in the figure is a current conversion circuit, which has the function of generating a constant current proportional to the voltage at point Q in the figure, and when the current is switched to the resistance temperature detector 2 side, Letting Is be the case of switching to the standard resistor 3 side, the results are as follows.
Ｉｔ ＝ｋ （Ｒｏ−＋−りＲ’Ｉ’ ） Ｉｏ
、、、１．、 ■Ｉｓ ＝ ｋＲ’ｏ ＩＯ・
自・・・■ここでｋは電流変換回路８の電流変換定数で
あるＯ
さらに図中９は発振回路で、一定周波数のクロックパル
スを発振しており、このクロックパルスを前記した計測
制御回路７が分周して、スイッチ５を測温抵抗体２側に
切り換え、極性変換回路６を正極性にする。かくするこ
とによりコンデンサ１０には０式よりＩｔ＝ｋ（Ｒｏ＋
ムＲＴ）Ｉの電流が流れ込み、これを充電し始める。第
１測制御回路７はこの積分時間をクロックパルスの先め
定められたＮパル２分の時間Ｔｏとなるよう制御するの
で、Ｔｏ後のコンデンサ１０の両端の電圧Ｖｃは次のよ
うになる。It = k (Ro-+-riR'I') Io
,,,1. , ■Is = kR'o IO・
Auto... ■Here, k is the current conversion constant of the current conversion circuit 8. Furthermore, 9 in the figure is an oscillation circuit that oscillates a clock pulse of a constant frequency, and this clock pulse is transmitted to the measurement control circuit 7. divides the frequency, switches the switch 5 to the resistance temperature detector 2 side, and sets the polarity conversion circuit 6 to positive polarity. By doing this, the capacitor 10 has It=k(Ro+
The current from RT) I flows into the circuit and begins to charge it. The first measurement control circuit 7 controls this integration time to be the predetermined time To of two N pulses of the clock pulse, so the voltage Vc across the capacitor 10 after To is as follows.
時間がＴだゆ経過すると、計測制御回路７はスイッチ５
を標準抵抗体３側に切り換え、極性変換回路６を負極性
に切り換えてコンデンサ１０で積分を行う。ここでコン
デンサＩＯの両端の電圧がゼロとなるまで９時間１反は
コンデンサー０の両端の電圧が前回の積分でＶｃ ＝ｖ
（ｌｌｏ＋乙Ｒｔ）ＩｏＴ。When the time T has elapsed, the measurement control circuit 7 switches the switch 5
is switched to the standard resistor 3 side, the polarity conversion circuit 6 is switched to negative polarity, and the capacitor 10 performs integration. Here, for 9 hours until the voltage across the capacitor IO becomes zero, the voltage across the capacitor 0 is the previous integration, Vc = v
(llo + Otsu Rt) IoT.
であるから、
０式より （Ｒｏ −ｔ４ＲＴ）Ｔｏ−Ｒ’ｏＴｘ
＝０ 、、、、、＠どなる。Therefore, from equation 0, (Ro -t4RT)To-R'oTx
=0 , , , , @ roar.
このように、時間豚が経過してコンデンサー０の両端電
圧がゼロと芹ると、零検゛出回路１１より出力が発生し
、フリツプフロツプ回路１２をリセットする。この７リ
ツプフロツプ回［１２はス、イッチ５が標準抵抗体３側
に切り換わると同時にセットされるようになっているか
ら、セットとリセットの間の時間は１″Ｘであり、また
ノリノブフロップ回路１２の出力はアンドゲートＩ３に
接続されているので、アントゲ−１・１３からは′■＼
の時間、発振回路９の出力クロックを通過させ、出力回
路１４を通して受信４側へ発信されることとなる。In this way, when the voltage across the capacitor 0 reaches zero after a period of time has elapsed, an output is generated from the zero detection output circuit 11 and the flip-flop circuit 12 is reset. These 7 lip-flop circuits [12 are switches] are set at the same time as switch 5 is switched to the standard resistor 3 side, so the time between setting and resetting is 1'' Since the output of the circuit 12 is connected to the AND gate I3, the output from the AND gates 1 and 13 is '■\
The output clock of the oscillation circuit 9 is passed through for a time of , and is transmitted to the receiving side 4 through the output circuit 14.
一方、ＴＯはクロックのＮパル２分として予め定められ
、ｈ時間内には同一の周期のクロックが通過するから、
クロックパルスの１周期をＴｃとすると、
Ｔｏ ＝ Ｔｃ ｘ Ｎ 、、、、、、
、■ｎ＝ Ｔｃ ｘ ｎ ・・・・・
・・００式、０式を０式に代入すると
（Ｒｏ＋４ＲＴ）ＴｃｘＮ−Ｒ’ｏＴｃｘｎ＝ Ｏ、、
、、、＠これを整理すると一１ゝ１“”−−−” ：
、’、、、。On the other hand, TO is predetermined as 2 minutes of N pulses of the clock, and since clocks with the same period pass within h time,
If one period of the clock pulse is Tc, then To = Tc x N, , , ,
,■n=Tc x n...
...Substituting the 00 formula and 0 formula into the 0 formula gives (Ro+4RT)TcxN-R'oTcxn=O,,
,,,@If you organize this, １１ゝ１“”---”：
,',,,.
Ｒ”ｏ Ｎ
品に要求される特性は１サンプルの計測時間内で積分用
コンデンサの容量、クロックの発振周波数が安定してい
れば良いこととなる。The characteristics required of an R''o N product are that the capacitance of the integrating capacitor and the oscillation frequency of the clock are stable within the measurement time of one sample.
また、受信計に於ては標準抵抗体３の値Ｒ’ｏ、一定積
分時間Ｔｏに対するパルス数Ｎは読値であるから、０式
より、
として測温抵抗体２の現時点での抵抗を知り温度の計測
を行うことができる。In addition, in the receiving meter, the value R'o of the standard resistor 3 and the number of pulses N for a constant integration time To are the reading values, so from equation 0, the current resistance of the resistance temperature detector 2 can be found as can be measured.
さらに、以下の如くすれば、発信するパルスを直読値に
することも可能である。Furthermore, it is also possible to make the transmitted pulse a direct reading value by doing the following.
測温抵抗体２をｐｔｉｏｏΩとした場合、臣はＯＯＣ基
準で１００．０． 、 Ｒ’ｏを１００ｆｌ、、ｎ＝
Ｎ十乙ｎとすると、１００°Ｃノ時、ｄＲＴ＝３９．１
６ｆｌ、これを［相］式に代入するととなる。したがっ
て直読できるようにするためにはＡ ｎ ＝ １００と
おけばよい。また有効数字を１桁増して０．１℃単位ま
で表−Ｔために、！Ｊｎ＝１０００とすると、０式は
となり、との０式を［相］式に代入すると、４ｎ＝２５
．５４×Δｎｒ 、、、、、、＠となる。If the resistance temperature sensor 2 is ptiooΩ, the resistance is 100.0.0 based on the OOC standard. , R'o is 100fl, , n=
When N is 100°C, dRT=39.1 at 100°C.
6fl, and substituting this into the [phase] equation becomes. Therefore, in order to enable direct reading, it is sufficient to set A n = 100. Also, increase the number of significant figures by one digit to the nearest 0.1°C for table-T! When Jn=1000, the 0 equation becomes, and substituting the 0 equation into the [phase] equation, 4n=25
．． 54×Δnr , , , , @.
ここでＰｔ１００．Ｑ、各点による０式による１泊を示
すと表Ｉのようになる。Here, Pt100. Q. Table I shows one night's stay according to the 0 formula for each point.
受信針にはｎ ＝ Ｎ ＋ ４ ｎなるパルス数が伝送
されるので、Ｎ（ここでは２５５４パルス）を差し引き
してカウントすればよいことになる。Since the number of pulses n = N + 4 n is transmitted to the receiving needle, it is sufficient to subtract N (here, 2554 pulses) and count.
なお、パルスの発信状態は第４図に示す如く ｌで、
（Ａ）はコンデンサ１ｏの両端の電圧、（Ｂ）は発信出
力イｇ号を示す。The pulse transmission state is l as shown in Figure 4.
(A) shows the voltage across the capacitor 1o, and (B) shows the transmission output Ig.
発情出力信号はスペースの後にパルス列信号が続く状態
が計測時間中周期的に繰り返されるので、受信計ではス
ペースとスペース間のパルスを計数して、次のスペース
でこのＲ−１゛測値をラッチする動作を繰り返し、その
信号をデコードして表示する等の受信動作をすればよい
。Since the estrus output signal has a space followed by a pulse train signal that is repeated periodically during the measurement time, the receiver counts the pulses between spaces and latches this R-1 measurement value in the next space. What is necessary is to perform a receiving operation such as repeating the above operation and then decoding and displaying the signal.
また、本実施例では、クロックの周波数をそのまま出力
するように構成したが、実際的にはアンドゲートの後に
カウンターを設け、ここでカウントした信号をコード化
し、て、これに適当なヘッドコードを付加してデータの
語長を短縮して伝送することが長距離伝送に適する。In addition, in this embodiment, the clock frequency is output as is, but in reality, a counter is provided after the AND gate, the counted signal is encoded, and an appropriate head code is applied to this. It is suitable for long-distance transmission to reduce the word length of data by adding it.
本発明に係る温度計測器は」二記の如く構成されている
ため、計測に際して回路構成部品の昼夜の温度差による
定数の変化等は一切影響がなく、現場に設置しても高精
度のデータを得ることができる。Since the temperature measuring device according to the present invention is configured as described in 2, there is no effect on constant changes due to temperature differences between day and night in circuit components during measurement, and highly accurate data can be obtained even when installed on site. can be obtained.
第１図、第２図は従来例を示す回路図、第３図は本発明
に併る温度＝ｉ６Ｉ＋ｉ器の回路図、第４図はパルスの
発（Ｍ状態を示す波形図である。
図中
１ 抵抗温度ぎ−１２測温抵抗体
３ 標準抵抗体 ６ ％性変換回路７ 計測制御
回路 ８ 電流変換回路９ 発振回路 １
０ コンデンサ１１ 零検出回路 １２
ソ１ルプフロツプ回路１３ アンドゲート
１４ 出力回路出願人 東京計装株式会社
代理人 弁理士 前 １）清 美1 and 2 are circuit diagrams showing a conventional example, FIG. 3 is a circuit diagram of a temperature=i6I+i device according to the present invention, and FIG. 4 is a waveform diagram showing pulse generation (M state. Middle 1 Resistance temperature -12 RTD 3 Standard resistance 6 Percentage conversion circuit 7 Measurement control circuit 8 Current conversion circuit 9 Oscillation circuit 1
0 Capacitor 11 Zero detection circuit 12
Solver flop circuit 13 AND gate
14 Output circuit applicant Tokyo Keiso Co., Ltd. Agent Patent attorney 1) Kiyomi
Claims (1)
、前記測温抵抗体と標準抵抗体の抵抗値の比を時間比に
変換する積分回路とからなる温度計測器。A temperature measuring instrument comprising a resistance thermometer in which a side temperature resistance element and a standard resistance element are arranged in parallel, and an integrating circuit that converts the ratio of the resistance values of the temperature measurement resistance element and the standard resistance element into a time ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16738482A JPS5956127A (en) | 1982-09-25 | 1982-09-25 | Temperature measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16738482A JPS5956127A (en) | 1982-09-25 | 1982-09-25 | Temperature measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5956127A true JPS5956127A (en) | 1984-03-31 |
Family
ID=15848703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16738482A Pending JPS5956127A (en) | 1982-09-25 | 1982-09-25 | Temperature measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5956127A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997006981A3 (en) * | 1995-08-17 | 1997-03-20 | Bosch Gmbh Robert | Process for checking a passenger safety device in a vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4967675A (en) * | 1972-10-18 | 1974-07-01 | ||
| JPS4974081A (en) * | 1972-11-15 | 1974-07-17 |
-
1982
- 1982-09-25 JP JP16738482A patent/JPS5956127A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4967675A (en) * | 1972-10-18 | 1974-07-01 | ||
| JPS4974081A (en) * | 1972-11-15 | 1974-07-17 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997006981A3 (en) * | 1995-08-17 | 1997-03-20 | Bosch Gmbh Robert | Process for checking a passenger safety device in a vehicle |
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