JPH0257660B2 - - Google Patents
Info
- Publication number
- JPH0257660B2 JPH0257660B2 JP56116714A JP11671481A JPH0257660B2 JP H0257660 B2 JPH0257660 B2 JP H0257660B2 JP 56116714 A JP56116714 A JP 56116714A JP 11671481 A JP11671481 A JP 11671481A JP H0257660 B2 JPH0257660 B2 JP H0257660B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- sample
- temperature sensor
- heat
- heat source
- 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 - Lifetime
Links
- 238000005303 weighing Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 9
- 238000012790 confirmation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Description
【発明の詳細な説明】
この発明は試料の水分率測定に用いる水分計に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moisture meter used for measuring the moisture content of a sample.
はかり皿に載せられた試料を加熱乾燥して試料
重量の減少から試料に含まれる水分量を測定する
水分計において、従来、設定すべき試料温度の制
御は、試料に熱を照射する熱源と試料の中間の大
気中の温度を基準として行われていた。しかし、
その大気中の温度と試料の温度に差があつて正確
な温度制御を行うことができず、試料が過熱され
るなどの欠点があつた。また、試料表面または試
料中に温度センサの測温接点を接触あるいは挿入
する場合、温度センサの重量の一部が試料重量と
ともに秤量されるから正確な水分量を得ることが
困難であつた。 In a moisture meter that measures the amount of water contained in a sample by heating and drying a sample placed on a weighing pan and determining the amount of water contained in the sample from the decrease in sample weight, conventionally, the sample temperature that must be set has been controlled by using a heat source that irradiates the sample and the sample. This was done based on the atmospheric temperature between . but,
There was a difference between the temperature in the atmosphere and the temperature of the sample, making it impossible to control the temperature accurately, resulting in the sample being overheated. Further, when a temperature measuring contact of a temperature sensor is brought into contact with or inserted into the sample surface or into the sample, it is difficult to obtain an accurate moisture content because a part of the weight of the temperature sensor is weighed together with the sample weight.
この発明は上述の点に鑑み、試料温度を設定す
べき値に制御して高精度に水分量を測定する水分
計を提供することを目的としている。 In view of the above-mentioned points, it is an object of the present invention to provide a moisture meter that measures moisture content with high accuracy by controlling the sample temperature to a desired value.
この発明は上記目的を達成するために、はかり
皿上に載せられた試料の温度を測定する第１の温
度センサと、上記第１の温度センサの測温接点を
移動する移動装置と、熱源からの照射熱の温度を
測定する第２の温度センサと、上記第２の温度セ
ンサによつて測定された温度を記憶する記憶装置
と、上記記憶装置に記憶された温度を保持するよ
う上記熱源の照射熱量を制御する制御装置とを有
し、上記第１の温度センサの測温接点が上記はか
り皿上に載せられた試料中に投入されその試料の
温度が所定の値に達したとき、そのときの上記熱
源による照射熱の温度を上記記憶装置に記憶し、
以降上記第１の温度センサの測温接点を試料外に
出し上記照射熱の温度を上記記憶装置に記憶した
温度に保持するよう構成されていることを特徴と
している。 In order to achieve the above object, the present invention includes a first temperature sensor that measures the temperature of a sample placed on a weighing pan, a moving device that moves a temperature measuring contact point of the first temperature sensor, and a moving device that moves a temperature measuring contact point of the first temperature sensor, and a second temperature sensor for measuring the temperature of the irradiated heat; a storage device for storing the temperature measured by the second temperature sensor; and a storage device for storing the temperature stored in the storage device. and a control device that controls the amount of heat irradiated, and when the temperature measuring contact of the first temperature sensor is put into the sample placed on the weighing pan and the temperature of the sample reaches a predetermined value, storing in the storage device the temperature of the irradiated heat from the heat source at the time;
Thereafter, the temperature measuring contact of the first temperature sensor is taken out of the sample, and the temperature of the irradiated heat is maintained at the temperature stored in the storage device.
以下、この発明の実施例を図面に従い説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
荷重−電気変換装置１ははかり皿２に載せられ
た試料による荷重を電気信号に変換するものであ
る。この荷重−電気変換装置１の出力はＡ／Ｄ変
換器によるＡ／Ｄ変換後、入出力（Ｉ／Ｏ）ポー
ト１２およびバスライン１８を経て中央処理装置
（CPU）１５、ROM１６、RAM１７に導入され
る。熱源６ははかり皿２上に照射する熱を発生す
るものであり、その照射熱量は温度調節装置９に
よつて調節される。温度センサ（第１の温度セン
サ４）は試料の温度を測定するためのものであ
り、はかり皿２に載せられた試料に挿入する測温
接点を移動するために上下移動用機構（例えばベ
ルト）１９に取り付けられている。温度センサ４
の出力はＡ／Ｄ変換器８に接続されている。上下
移動用ベルト１９は駆動装置７によつて駆動され
る。温度センサ（第２の温度センサ）５は熱源６
の照射熱の温度を測定するためのものであり、熱
源６の近傍にその測定接点が設けられている。温
度センサ５の出力は温度調節装置９に接続されて
いる。温度調節装置９は調節すべき熱源６の照射
熱の温度を記憶する記憶装置を有し、この記憶装
置に記憶した温度を保持するよう熱源６への電源
供給を調節するものである。中央処理装置
（CPU）１５は、ROM１６に書き込まれたシー
ケンスプログラムに従い温度調節装置９の動作を
制御し、タイマ１１によつて設定された測定時間
が経過したか、または荷重−電気変換装置１によ
つて測定された試料重量の単位時間あたりの変化
量が予め設定した一定範囲内に入つたとき、試料
に含まれている水分量がなくなつたことを表す絶
乾点に達したと判断して水分率を算出しその値を
ドライバ１３を介して表示装置１４に表示する処
理を行うよう構成されている。この水分率は、加
熱前の試料重量W1と絶乾点に達したときの試料
重量W2から求まる（W1−W2）／W1の値であ
る。RAM１７は加熱前の試料重量の値、水分率
測定のために予め設定する試料温度の値、たとえ
ば100℃の値、および試料温度が予め設定された
値に達したときの熱源６の照射熱の温度の値など
を記憶する記憶領域を有する。荷重−電気変換装
置１によつて測定された加熱前の試料重量のデー
タは一定時間経過して安定したときRAM１７に
記憶される。設定される試料温度の値は予め
RAM１７に書き込まれるか、キーボード１０の
キー操作によつてRAM１７に入力される。 The load-to-electrical conversion device 1 converts the load caused by a sample placed on a weighing pan 2 into an electrical signal. After A/D conversion by an A/D converter, the output of this load-electrical converter 1 is introduced into a central processing unit (CPU) 15, ROM 16, and RAM 17 via an input/output (I/O) port 12 and a bus line 18. be done. The heat source 6 generates heat to be irradiated onto the weighing pan 2, and the amount of irradiated heat is adjusted by a temperature control device 9. The temperature sensor (first temperature sensor 4) is for measuring the temperature of the sample, and has a vertical movement mechanism (for example, a belt) to move the temperature measuring contact to be inserted into the sample placed on the weighing pan 2. It is attached to 19. Temperature sensor 4
The output of is connected to an A/D converter 8. The vertically moving belt 19 is driven by a drive device 7. Temperature sensor (second temperature sensor) 5 is a heat source 6
It is for measuring the temperature of the irradiated heat, and its measurement contact is provided near the heat source 6. The output of the temperature sensor 5 is connected to a temperature adjustment device 9. The temperature adjustment device 9 has a storage device that stores the temperature of the irradiated heat from the heat source 6 to be adjusted, and adjusts the power supply to the heat source 6 so as to maintain the temperature stored in the storage device. The central processing unit (CPU) 15 controls the operation of the temperature control device 9 according to the sequence program written in the ROM 16, and when the measurement time set by the timer 11 has elapsed or the load-electricity conversion device 1 When the amount of change in the measured sample weight per unit time falls within a preset range, it is determined that the absolute dry point, which indicates that the amount of water contained in the sample has disappeared, has been reached. The system is configured to calculate the moisture content and display the calculated value on the display device 14 via the driver 13. This moisture content is the value of (W 1 −W 2 )/W 1 determined from the sample weight W 1 before heating and the sample weight W 2 when the absolute dry point is reached. The RAM 17 stores the value of the sample weight before heating, the sample temperature value preset for moisture content measurement, for example, a value of 100°C, and the irradiation heat of the heat source 6 when the sample temperature reaches the preset value. It has a storage area for storing temperature values, etc. The data of the sample weight before heating measured by the load-electricity converter 1 is stored in the RAM 17 when it becomes stable after a certain period of time. The sample temperature value to be set is
The information is written into the RAM 17 or input into the RAM 17 by key operations on the keyboard 10.
このような構成において、まず試料３がはかり
皿２に載せられ、温度センサ４の測温接点は試料
３と接触しない位置におかれ、加熱前の試料重量
W1が荷重−電気変換装置１によつて測定されて
RAM１７に記憶され、その値は表示装置１４に
表示される。操作者はこの表示を確認してキーボ
ード１０の入力指示キーを押しCPU１５に確認
信号を送る。CPU１５はこの確認信号を受けて、
駆動装置７に駆動信号を発して移動用ベルト１９
を駆動させる。移動用ベルト１９の移動により温
度センサ４の測温接点が試料内に挿入される。さ
らに、熱源６への電源供給が温度調節装置９によ
つて開始される。熱源６からの照射熱の温度は温
度センサ５によつて検出されそのデータは温度調
節装置９に導入され、また、熱源６によつて加熱
された試料の温度は温度センサ４によつて検出さ
れCPU１５に導入される。RAM１７に設定すべ
き試料温度として100℃の値が記憶されていると
すると、CPU１５は温度センサ４によつて検出
された温度が100℃になつたかどうかを判断する。
試料温度が100℃に達したと判断したとき、CPU
１５は温度センサ５によつて検出されるその時の
照射熱の温度を温度調節装置９に記憶させる。以
降、温度調節装置９は記憶した温度を保持するよ
う熱源６への電源供給の調節を開始する。CPU
１５は、温度調節装置９が作動すると、駆動装置
７に駆動信号を発し、移動用ベルト１９を移動さ
せて温度センサ４の測温接点を試料外に取り出さ
せる。これにより荷重−電気変換装置１は加熱に
よつて含有水分量が減少していく試料重量だけを
検出し続ける。操作者が予めタイマ１１によつて
設定した測定時間が経過したか、または試料重量
の単位時間あたりの変化量が一定範囲内に入つた
とき、CPU１５は絶乾点に達したと判断し、温
度調節装置９に加熱終了信号を発して加熱を停止
するとともに、その時の試料重量W2と加熱前の
試料重量W1から水分率（W1−W2）／W1を算出
し表示装置１４にその値を表示する。 In such a configuration, the sample 3 is first placed on the weighing pan 2, the temperature measuring contact of the temperature sensor 4 is placed in a position where it does not come into contact with the sample 3, and the weight of the sample before heating is measured.
W 1 is measured by the load-electrical converter 1
The value is stored in the RAM 17 and displayed on the display device 14. The operator confirms this display and presses the input instruction key on the keyboard 10 to send a confirmation signal to the CPU 15. Upon receiving this confirmation signal, the CPU 15
A drive signal is sent to the drive device 7 to move the moving belt 19.
drive. As the moving belt 19 moves, the temperature measuring contact of the temperature sensor 4 is inserted into the sample. Further, power supply to the heat source 6 is started by the temperature adjustment device 9. The temperature of the irradiated heat from the heat source 6 is detected by the temperature sensor 5 and the data is introduced into the temperature controller 9, and the temperature of the sample heated by the heat source 6 is detected by the temperature sensor 4. Introduced to CPU15. Assuming that a value of 100°C is stored as the sample temperature to be set in the RAM 17, the CPU 15 determines whether the temperature detected by the temperature sensor 4 has reached 100°C.
When it is determined that the sample temperature has reached 100℃, the CPU
15 causes the temperature adjustment device 9 to store the temperature of the irradiated heat detected by the temperature sensor 5 at that time. Thereafter, the temperature control device 9 starts adjusting the power supply to the heat source 6 so as to maintain the stored temperature. CPU
15 issues a drive signal to the drive device 7 when the temperature adjustment device 9 is activated, and moves the moving belt 19 to take out the temperature measuring contact of the temperature sensor 4 outside the sample. As a result, the load-to-electricity converter 1 continues to detect only the weight of the sample whose water content decreases due to heating. When the measurement time preset by the operator using the timer 11 has elapsed, or when the amount of change in the sample weight per unit time falls within a certain range, the CPU 15 determines that the absolute dry point has been reached, and the temperature A heating end signal is issued to the adjustment device 9 to stop the heating, and the moisture content (W 1 - W 2 )/W 1 is calculated from the sample weight W 2 at that time and the sample weight W 1 before heating and displayed on the display device 14. Display its value.
この発明において、温度調節装置９に記憶させ
る温度を、試料温度が設定した値に達したときの
熱源からの照射熱の温度より少し低い値にすれ
ば、より正確に熱源の温度調節を行うことができ
る。また、試料温度を表示装置に表示して、設定
した値に達したとき操作者自ら温度センサを試料
外に取り外してもよい。 In this invention, the temperature of the heat source can be controlled more accurately by setting the temperature stored in the temperature control device 9 to a value slightly lower than the temperature of the irradiated heat from the heat source when the sample temperature reaches the set value. Can be done. Alternatively, the sample temperature may be displayed on the display device, and when the temperature reaches a set value, the operator may remove the temperature sensor from the sample.
以上説明したように、本発明によれば、はかり
皿上に載せられた試料の温度を第１の温度センサ
で測定し、その試料温度があらかじめ設定した温
度に達したときの、熱源の照射熱を第２の温度セ
ンサで測定して、その測定値を記憶しておき、第
１の温度センサの測温接点を試料から外した状態
で、熱源の照射熱の温度を上記の記憶値に保持す
るよう構成したから、直接的に測定した試料自体
の温度を基準として熱源の照射熱量を制御するこ
とが可能となり、その温度制御が正確となつて、
精度の高い水分測定が行えるとともに、試料が必
要以上に過熱されることを防止できる。 As explained above, according to the present invention, the temperature of the sample placed on the weighing pan is measured by the first temperature sensor, and when the sample temperature reaches a preset temperature, the irradiated heat of the heat source is is measured with a second temperature sensor, the measured value is memorized, and the temperature of the irradiated heat from the heat source is maintained at the above memorized value with the temperature measuring contact of the first temperature sensor removed from the sample. Since the structure is configured to
Moisture measurement can be performed with high accuracy, and the sample can be prevented from being overheated more than necessary.
図面はこの発明の実施例の構成を示す図であ
る。
１……荷重−電気変換装置、２……はかり皿、
３……試料、４，５……温度センサ、６……熱
源、７……駆動装置、９……温度調節装置、１５
……中央処理装置（CPU）、１６……ROM、１
７……RAM。
The drawings are diagrams showing the configuration of an embodiment of the present invention. 1... Load-electrical conversion device, 2... Scale plate,
3... Sample, 4, 5... Temperature sensor, 6... Heat source, 7... Drive device, 9... Temperature adjustment device, 15
... Central processing unit (CPU), 16 ... ROM, 1
7...RAM.
Claims (1)
換する荷重−電気変換装置と、上記はかり皿に載
せられた試料に熱を照射する熱源とを備え、上記
はかり皿上で試料を加熱し、試料重量の減少よ
り、この試料に含まれている水分量を測定する装
置において、上記はかり皿上に載せられた試料の
温度を測定する第１の温度センサと、上記第１の
温度センサの測温接点を移動する移動装置と、上
記熱源の照射熱の温度を測定する第２の温度セン
サと、上記第２の温度センサによつて測定された
温度を記憶する記憶装置と、上記記憶装置に記憶
された温度を保持するよう上記熱源の照射熱量を
制御する制御装置とを有し、上記第１の温度セン
サの測温接点が上記はかり皿上に載せられた試料
中に投入されその試料の温度が所定の値に達した
とき、そのときの上記熱源による照射熱の温度を
上記記憶装置に記憶し、以降上記第１の温度セン
サの測温接点を試料外に出し上記照射熱の温度を
上記記憶装置に記憶した温度に保持するよう構成
された水分計。1. A load-to-electrical conversion device that converts a load applied onto a scale plate into an electrical signal, and a heat source that irradiates heat to a sample placed on the scale plate, and heats the sample on the scale plate; Due to the decrease in sample weight, in an apparatus for measuring the amount of water contained in this sample, the first temperature sensor that measures the temperature of the sample placed on the weighing pan, and the measurement of the first temperature sensor. a moving device that moves the hot junction; a second temperature sensor that measures the temperature of the irradiated heat of the heat source; a storage device that stores the temperature measured by the second temperature sensor; a control device that controls the amount of heat irradiated by the heat source so as to maintain the stored temperature, and the temperature measuring contact of the first temperature sensor is inserted into the sample placed on the weighing pan, and the temperature of the sample is When the temperature reaches a predetermined value, the temperature of the irradiated heat from the heat source at that time is stored in the storage device, and thereafter the temperature measuring contact of the first temperature sensor is brought out of the sample and the temperature of the irradiated heat is measured. A moisture meter configured to maintain the temperature stored in the storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11671481A JPS5818155A (en) | 1981-07-24 | 1981-07-24 | Moisture meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11671481A JPS5818155A (en) | 1981-07-24 | 1981-07-24 | Moisture meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5818155A JPS5818155A (en) | 1983-02-02 |
| JPH0257660B2 true JPH0257660B2 (en) | 1990-12-05 |
Family
ID=14693988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11671481A Granted JPS5818155A (en) | 1981-07-24 | 1981-07-24 | Moisture meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5818155A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176657A (en) * | 1983-03-25 | 1984-10-06 | Agency Of Ind Science & Technol | Quantitative analyzing method of thermally decomposed trace ore in rock |
| JPS61147955U (en) * | 1985-03-05 | 1986-09-12 | ||
| US8727608B2 (en) * | 2003-09-04 | 2014-05-20 | Flir Systems, Inc. | Moisture meter with non-contact infrared thermometer |
| DE102004053734B4 (en) | 2004-11-06 | 2007-01-18 | Sartorius Ag | drying balance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5280096A (en) * | 1975-12-26 | 1977-07-05 | Shimadzu Corp | Moisture measuring device |
-
1981
- 1981-07-24 JP JP11671481A patent/JPS5818155A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5280096A (en) * | 1975-12-26 | 1977-07-05 | Shimadzu Corp | Moisture measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5818155A (en) | 1983-02-02 |
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