JPH0236108Y2 - - Google Patents
Info
- Publication number
- JPH0236108Y2 JPH0236108Y2 JP1983202965U JP20296583U JPH0236108Y2 JP H0236108 Y2 JPH0236108 Y2 JP H0236108Y2 JP 1983202965 U JP1983202965 U JP 1983202965U JP 20296583 U JP20296583 U JP 20296583U JP H0236108 Y2 JPH0236108 Y2 JP H0236108Y2
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- temperature
- power
- heating
- resistance value
- 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
- 238000010438 heat treatment Methods 0.000 claims description 61
- 238000005259 measurement Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Drying Of Solid Materials (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は、熱源により試料を加熱乾燥して水分
を蒸発させ、乾燥前後後の重量変化から水分率を
求める水分計に関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to a moisture meter that evaporates water by heating and drying a sample with a heat source and determines the moisture content from the change in weight before and after drying.
(ロ) 従来技術
熱源により試料を加熱する際、加熱温度を制御
するために、試料の温度を検出する場合と、熱源
の温度を検出する場合がある。後者の場合、熱源
の発熱体が通常、ある体積や面積を有しているた
め、どの点の温度を検出すべきかが問題となり、
従来は、複数の検出器を発熱体の諸所に設置し
て、それら検出器の検出値の平均を求めるか、ま
たは、検出面積の大きな検出器を使用して発熱体
の温度を検出していたが、いずれにしても、発熱
体を代表する温度を検出することが困難であつ
た。(B) Prior Art When heating a sample with a heat source, in order to control the heating temperature, there are cases in which the temperature of the sample is detected, and there are cases in which the temperature of the heat source is detected. In the latter case, the heating element of the heat source usually has a certain volume or area, so the question is which point should the temperature be detected?
Conventionally, the temperature of the heating element was detected by installing multiple detectors at various locations on the heating element and calculating the average of the detection values from those detectors, or by using a detector with a large detection area. However, in any case, it was difficult to detect the temperature representative of the heating element.
(ハ) 考案の目的
本考案はこのような点に鑑みてなされたもの
で、加熱乾燥用の発熱体を代表する温度を、検出
の応答遅れを伴うことなく正確に検出することが
でき、もつて常に設定された温度のもとに試料を
加熱して正確な水分率の測定を行うことのできる
水分計の提供を目的としている。(c) Purpose of the invention The present invention has been developed in view of the above points, and is capable of accurately detecting the temperature typical of a heating element for heating and drying without any delay in detection response. The purpose of the present invention is to provide a moisture meter that can accurately measure moisture content by heating a sample at a constant temperature.
(ニ) 考案の構成
上記の目的を達成するため、本考案では、加熱
温度設定器と、熱源となる電気抵抗発熱体と、そ
の発熱体に供給する電力を制御する電力制御器
と、その電力制御器からの電力とは異なる周波数
の電気信号を発熱体に供給する交流電源と、その
交流電源からの電気信号を発熱体から周波数選別
して抽出する回路手段と、その抽出された電気信
号を用いて発熱体の電気抵抗値を測定する抵抗値
測定回路を設け、その抵抗値測定結果から発熱体
の温度情報を得て、その情報と加熱温度設定器の
設定値とによつて電力制御器の動作信号を得るよ
う構成している。(d) Structure of the invention In order to achieve the above object, the invention includes a heating temperature setting device, an electric resistance heating element serving as a heat source, a power controller for controlling the electric power supplied to the heating element, and a power controller for controlling the electric power supplied to the heating element. An AC power supply that supplies an electrical signal of a frequency different from that of the electric power from the controller to the heating element, a circuit means for frequency-selecting and extracting the electrical signal from the AC power supply from the heating element, and a circuit means for extracting the electrical signal from the heating element by frequency selection. A resistance value measuring circuit is provided to measure the electric resistance value of the heating element using the resistance value measurement result, and the temperature information of the heating element is obtained from the resistance value measurement result. The system is configured to obtain an operating signal.
(ホ) 実施例
本考案の水分計の実施例を以下図面に基づいて
説明する。(e) Examples Examples of the moisture meter of the present invention will be described below based on the drawings.
まず、本実施例の水分計は、第１図に示す如
く、下記の機器、回路により構成されている。 First, as shown in FIG. 1, the moisture meter of this embodiment is composed of the following equipment and circuits.
発熱体４は、電力制御器１１により制御された
電力を、電路２１を通じて供給されて、発熱し、
試料３を加熱する。 The heating element 4 is supplied with electric power controlled by the power controller 11 through the electric line 21, and generates heat.
Heat sample 3.
電力制御器１１は、発熱体４が、温度設定器１
３によりあらかじめ設定された温度になるよう、
温度調節器１２から制御動作信号２６を送られ
る。 The power controller 11 is configured such that the heating element 4 is connected to the temperature setting device 1.
3, so that the temperature is set in advance.
A control operation signal 26 is sent from the temperature controller 12 .
発振器８は、上記電力制御器１１の出力する電
力の商用周波数とは別周波数の、微小な交流電力
を生成し、その電圧を、トランス７を介して電路
２１に、電力制御器１１の供給電力に重畳して印
加する。このため発熱体４には、電力制御器１１
による加熱電圧、電流に加えて、別周波数の電
圧、電流が追加されるが、後者の電圧、電流は下
記の如く、発熱体４の電気抵抗値測定のために使
用される。 The oscillator 8 generates minute alternating current power with a frequency different from the commercial frequency of the power output by the power controller 11, and transmits the voltage to the electric line 21 via the transformer 7 as the power supplied by the power controller 11. It is superimposed on and applied. For this reason, the heating element 4 is equipped with a power controller 11.
In addition to the heating voltage and current, a voltage and current of another frequency are added, and the latter voltage and current are used to measure the electrical resistance value of the heating element 4 as described below.
即ち変流器５は、電路２１の電流を測定し、次
いでフイルタ６は、変流器５の測定電流のうち、
上記の別周波数の電流成分２３のみを通過させ
て、それを抵抗値測定回路９に出力する。更に、
抵抗値測定回路９は、上記の電流成分２３と、発
振器８の発振電圧２２を受け、これらの電流、電
圧から、発熱体４の電気抵抗値を計算し、計算結
果の信号２４を温度変換器１０に出力する。 That is, the current transformer 5 measures the current of the electric line 21, and then the filter 6 measures the current of the current transformer 5.
Only the current component 23 of the above-mentioned different frequency is allowed to pass and is outputted to the resistance value measuring circuit 9. Furthermore,
The resistance value measuring circuit 9 receives the above-mentioned current component 23 and the oscillation voltage 22 of the oscillator 8, calculates the electrical resistance value of the heating element 4 from these currents and voltages, and sends the calculated signal 24 to a temperature converter. Output to 10.
温度変換器１０は、上記の信号２４を受け、こ
れを温度に変換し、その温度の信号２５を、発熱
体４の温度として、温度調節器１２にフイードバ
ツクする。 The temperature converter 10 receives the above signal 24, converts it to temperature, and feeds back the temperature signal 25 to the temperature controller 12 as the temperature of the heating element 4.
次に、天秤１は試料３を皿２に載せ、加熱乾燥
前後の重量を測定し、乾燥完了時はその旨の信号
２０を、温度制御器１２に送る。 Next, the balance 1 places the sample 3 on a plate 2, measures its weight before and after heating and drying, and sends a signal 20 to that effect to the temperature controller 12 when drying is complete.
次に作用を述べる。 Next, we will discuss the effect.
水分計は上述のような機器、回路により構成さ
れているので、発熱体４が電力制御器１１の供給
電力により加熱されている間の、その電気抵抗
は、抵抗値測定回路９により、（電圧値２２）÷
（電流値２３）の算式により算出される。 Since the moisture meter is composed of the above-mentioned devices and circuits, while the heating element 4 is being heated by the power supplied by the power controller 11, its electrical resistance is determined by the resistance value measuring circuit 9 (voltage Value 22) ÷
It is calculated using the formula (current value 23).
このように算出された発熱体４の電気抵抗値の
信号２４は、回路９から、温度変換器１０に送ら
れる。この電気抵抗信号２４は、温度変換器１０
において、電気抵抗値が温度に対して所定の関数
関係にある理に基づき、抵抗値−温度の較正曲線
を用いた変換回路により、温度に変換され、変換
された温度信号２５は発熱体４の温度の測定値と
して、温度調節器１２に送られる。温度調節器１
２では、温度設定器１３により設定された温度
と、上記の如く測定された発熱体４の温度が比較
され、両者が一致するよう、制御動作信号２６が
電力制御器１１に送られ、発熱体４に供給される
電力が制御される。 A signal 24 representing the electrical resistance value of the heating element 4 calculated in this way is sent from the circuit 9 to the temperature converter 10. This electrical resistance signal 24 is transmitted to the temperature converter 10
Based on the principle that the electrical resistance value has a predetermined functional relationship with the temperature, the converted temperature signal 25 is converted to temperature by a conversion circuit using a resistance value-temperature calibration curve, and the converted temperature signal 25 is It is sent to the temperature controller 12 as a temperature measurement value. Temperature controller 1
2, the temperature set by the temperature setting device 13 and the temperature of the heating element 4 measured as described above are compared, and so that the two match, a control operation signal 26 is sent to the power controller 11, and the temperature of the heating element 4 is 4 is controlled.
試料３は、このようにして発熱を制御される発
熱体４により加熱されるが、その水分が蒸発して
重量変化がなくなる点、即ち絶乾点は、天秤１に
より検出される。絶乾点が検出された時には、そ
の旨の信号２０が天秤１から、温度調節器１２に
送られる。その結果、電力制御器１１による熱源
４への電力供給は、停止される。その時点におい
て、試料３の水分率が算出される。 The sample 3 is heated by the heating element 4 whose heat generation is controlled in this manner, and the balance 1 detects the point at which the moisture evaporates and there is no change in weight, that is, the absolute dry point. When the absolute dry point is detected, a signal 20 to that effect is sent from the balance 1 to the temperature controller 12. As a result, the power supply to the heat source 4 by the power controller 11 is stopped. At that point, the moisture content of sample 3 is calculated.
ここで注目すべき点は、発熱体４の電気抵抗を
測定するために、発熱体４に、加熱用の電力とは
別の周波数の交流信号を重畳印加する点である。
この構成によつて、発熱体４の電気抵抗つまり温
度情報を時間遅れを生じることなく常時得ること
が可能となる。 What should be noted here is that in order to measure the electrical resistance of the heating element 4, an alternating current signal of a frequency different from that of heating power is applied to the heating element 4 in a superimposed manner.
With this configuration, it is possible to constantly obtain electrical resistance, ie, temperature information of the heating element 4 without any time delay.
すなわち、発熱体４の電気抵抗は、これを加熱
するための電力からも測定可能であるが、この加
熱用電力は、発熱体４の温度制御をすべく電力制
御器１１による所定の制御下に置かれる。このこ
とは、電力制御器１１による制御の形態が例えば
ON・OFF制御であれ、電圧制御、あるいは位相
制御であれ、この電力が定常的なものとはなら
ず、例えば設定温度を越えた状態ではこの電力は
零ないしはその近傍となることを意味し、この電
力を利用して発熱体４の電気抵抗を常時測定する
ことは極めて困難となる。そこで本考案では、加
熱用電力とは別に発熱体４に測定用電気信号を重
畳して印加し、その電気信号を周波数選別して抽
出することによつて発熱体４の電気抵抗を測定す
る構成を採ることで、発熱体４の電気抵抗の時々
刻々の測定を可能とし、検出の時間遅れを生じる
ことなく発熱体４を代表する温度の検出を可能と
している。 That is, the electrical resistance of the heating element 4 can also be measured from the electric power used to heat it, but this heating electric power is under a predetermined control by the power controller 11 in order to control the temperature of the heating element 4. placed. This means that the form of control by the power controller 11 is, for example,
Whether it is ON/OFF control, voltage control, or phase control, this power is not constant; for example, when the temperature exceeds the set temperature, this power will be at or near zero. It is extremely difficult to constantly measure the electrical resistance of the heating element 4 using this power. Therefore, in the present invention, the electrical resistance of the heating element 4 is measured by applying a superimposed electrical signal for measurement to the heating element 4 separately from the heating power, and extracting the electrical signal by frequency selection. By adopting this method, it is possible to measure the electrical resistance of the heating element 4 from time to time, and it is possible to detect the representative temperature of the heating element 4 without causing a time delay in detection.
（ヘ） 考案の効果
以上説明したように、本考案によれば、加熱用
の発熱体の電気抵抗を測定して温度情報としてい
るので、発熱体を代表する温度を得ることができ
るとともに、その発熱体の電気抵抗、加熱制御の
ための電力とは別の電気信号を用いて測定されの
で、加熱温度の状態や制御状況に拘らず時々刻々
と正確な測定が可能となり、測定の時間遅れを生
じることもなくなり、その結果として、正確な温
度制御が可能となる。(f) Effects of the device As explained above, according to the present invention, the electrical resistance of the heating element for heating is measured and used as temperature information, so it is possible to obtain a representative temperature of the heating element, and also to measure the temperature of the heating element. Since the electrical resistance of the heating element is measured using an electrical signal separate from the power used for heating control, accurate measurements can be made from moment to moment regardless of the heating temperature state or control status, eliminating time delays in measurement. As a result, accurate temperature control becomes possible.
図面は、本考案の実施例の構成を示すブロツク
図である。
１……天秤、２……皿、３……試料、４……発
熱体、５……変流器、６……フイルタ、７……ト
ランス、８……発振器、９……抵抗値測定回路、
１０……温度変換器、１１……電力制御器、１２
……温度調節器。
The drawing is a block diagram showing the configuration of an embodiment of the present invention. 1... Balance, 2... Dish, 3... Sample, 4... Heating element, 5... Current transformer, 6... Filter, 7... Transformer, 8... Oscillator, 9... Resistance value measurement circuit ,
10... Temperature converter, 11... Power controller, 12
……air conditioner.
Claims (1)
の重量変化から水分率を求める装置において、加
熱温度設定器と、熱源となる電気抵抗発熱体と、
その発熱体に供給する電力を制御する電力制御器
と、その電力制御器からの電力とは異なる周波数
の電気信号を上記発熱体に供給する交流電源と、
その交流電源からの電気信号を上記発熱体から周
波数選別して抽出する回路手段と、その抽出され
た電気信号を用いて上記発熱体の電気抵抗値を測
定する抵抗値測定回路を有し、その抵抗値測定結
果から上記発熱体の温度情報を得て、その情報と
上記加熱温度設定器の設定値とによつて上記電力
制御器の動作信号を得るよう構成されていること
を特徴とする水分計。 A device that heats and dries a material to evaporate moisture and determines the moisture content from the weight change before and after drying, which includes a heating temperature setting device, an electric resistance heating element serving as a heat source,
a power controller that controls the power supplied to the heating element; and an AC power source that supplies the heating element with an electrical signal of a different frequency from the power from the power controller;
It has circuit means for frequency-selecting and extracting an electrical signal from the AC power source from the heating element, and a resistance value measuring circuit for measuring the electrical resistance value of the heating element using the extracted electrical signal. The moisture content is characterized in that the temperature information of the heating element is obtained from the resistance value measurement result, and the operation signal of the power controller is obtained based on the information and the setting value of the heating temperature setting device. Total.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20296583U JPS60106150U (en) | 1983-12-23 | 1983-12-23 | Moisture meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20296583U JPS60106150U (en) | 1983-12-23 | 1983-12-23 | Moisture meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60106150U JPS60106150U (en) | 1985-07-19 |
| JPH0236108Y2 true JPH0236108Y2 (en) | 1990-10-02 |
Family
ID=30765388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20296583U Granted JPS60106150U (en) | 1983-12-23 | 1983-12-23 | Moisture meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60106150U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2822396B2 (en) * | 1988-09-30 | 1998-11-11 | 株式会社島津製作所 | Thermogravimeter |
-
1983
- 1983-12-23 JP JP20296583U patent/JPS60106150U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60106150U (en) | 1985-07-19 |
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