WO2014112398A1 - Electronic weighing device having flow calculation function - Google Patents

Electronic weighing device having flow calculation function Download PDF

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Publication number
WO2014112398A1
WO2014112398A1 PCT/JP2014/050003 JP2014050003W WO2014112398A1 WO 2014112398 A1 WO2014112398 A1 WO 2014112398A1 JP 2014050003 W JP2014050003 W JP 2014050003W WO 2014112398 A1 WO2014112398 A1 WO 2014112398A1
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unit
flow rate
value
arithmetic processing
measured value
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PCT/JP2014/050003
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French (fr)
Japanese (ja)
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雄二 深見
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株式会社 エー・アンド・デイ
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/007—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring the level variations of storage tanks relative to the time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight

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  • the present invention relates to an electronic weighing device such as an electronic balance and an electronic balance, and more particularly to an electronic weighing device having a function of calculating a flow rate of a liquid or a granular material.
  • the measurement of the flow volume using an electronic balance is generally performed as follows. First, when measuring the amount to be injected into a container, as shown in FIG. 4, the container is placed on a weighing platform of an electronic balance, and the mass of liquid injected from the tank into the container by a device such as a pump is determined. While the electronic balance is configured to be capable of weighing, an external device such as a personal computer connected to the electronic balance can record the weighing value of the electronic balance at regular intervals (recording interval: ⁇ t). Then, the flow rate is calculated from the change in the mass of the liquid caused by the liquid injection and the recording interval ( ⁇ t). Second, when measuring the mass of the liquid discharged from the tank to the container, as shown in FIG. 5, the tank is placed on the weighing platform of the electronic balance, and the liquid in the tank is discharged in the same manner as described above. Calculate the amount.
  • the external device records the measured value w 0 at the measurement start time t 0 .
  • the measurement w 1 is similarly recorded at time t 1 after the elapse of the recording interval ( ⁇ t) from time t 0 .
  • the time t 0, t 1, t metric w 0 when the 2 ⁇ t n, w 1, w constantly records the 2 ⁇ ⁇ ⁇ w n .
  • the current flow rate is obtained by the above-described method, and the flow rate is adjusted from the external device to the pump from the difference between the target flow rate and the current flow rate, so that the target flow rate is obtained. Control is performed.
  • Patent Document 1 Japanese Patent Document 1
  • an external device such as a personal computer is time-controlled based on an internal clock (for example, a crystal oscillator), and records the weighing value of the electronic balance at every recording interval ( ⁇ t).
  • the electronic balance is also time-controlled based on an internal clock (for example, a crystal oscillator), and updates the measurement every predetermined time and sends a measurement value request signal from an external device.
  • an internal clock for example, a crystal oscillator
  • the electronic balance is also time-controlled based on an internal clock (for example, a crystal oscillator), and updates the measurement every predetermined time and sends a measurement value request signal from an external device.
  • an internal clock for example, a crystal oscillator
  • the case of 2 seconds (updated 5 times per second) will be described.
  • the electronic balance outputs the measured value when the measured value is updated next, or sends the measured value that was updated immediately before to the external device, according to the position determined in advance by the measured value request signal.
  • the issuance of the weighing value request signal in the above (1) requests the electronic balance to output the weighing value accurately every second, and the updating interval of the weighing value of the electronic balance is If it is exactly 0.2 seconds, the measured value is output to the external device and recorded every time the measured value is updated five times. Therefore, the calculation of the flow rate according to the above formula is always performed correctly.
  • the measurement value update interval of the electronic balance remains every 0.19 seconds, and the measurement value recording interval (measurement value request signal issuance interval) by the external device is 1 to 10 seconds. If the value is changed to, the weighing value recorded by the external device may be recorded every 52 times or every 53 times when the weighing value of the electronic balance is updated.
  • both the first and second methods are methods for reducing an error that occurs when the flow rate is calculated, and the error cannot theoretically be completely eliminated.
  • an electronic weighing device having a flow rate calculation function includes a load sensor unit, a clock unit that generates a reference time signal, and a reference time signal from the clock unit.
  • the analog load signal output from the load sensor unit is converted into digital load data, and when the reference time signal is received from the clock unit, the A / D converter outputs the analog load signal.
  • An arithmetic processing unit that corrects load data and converts it to a measured value, calculates the amount of change per unit time of the measured value to obtain a flow rate, and a display unit that displays predetermined data output from the arithmetic processing unit And a storage unit for storing various data necessary for arithmetic processing in the arithmetic processing unit, and an input / output unit for inputting / outputting various data between the arithmetic processing unit and an external device.
  • an electronic measuring apparatus having a flow rate calculation function according to the first aspect, wherein the storage unit is newly converted by a reference time signal from a clock unit in the arithmetic processing unit.
  • the measured value is recorded every time the measured value is updated a predetermined number of times, and the arithmetic processing unit calculates the difference between the measured value previously recorded in the storage unit and the currently recorded measured value for each measured value that is a unit time.
  • the flow rate is obtained by dividing by the recording interval.
  • the predetermined data displayed on the display unit is a measured value and a flow rate value. It is characterized by.
  • the load sensor unit of the electronic weighing device outputs an analog load signal to the A / D conversion unit, and the A / D conversion unit is generated at a constant time interval (update interval), that is, at the clock unit.
  • the load signal is digitally converted into load data and output to the arithmetic processing unit.
  • the arithmetic processing unit receives the reference time signal generated by the clock unit, it performs a correction operation on the load data output from the A / D conversion unit to convert it into a measured value, and a unit time of this measured value More specifically, the difference between the measured value recorded last time in the storage unit and the calculated value recorded this time is divided by the recording interval of each calculated value to obtain the flow rate.
  • the measurement value and the flow rate value output from the arithmetic processing unit are displayed on the display unit.
  • the arithmetic processing unit mounted on the electronic weighing device has a function of calculating the flow rate from the measured value, and the update interval of the measured value is determined to be unique depending on the design of the electronic weighing device.
  • the measurement value update interval is determined depending on the processing based on the reference time from the clock unit made of a crystal oscillator, for example, mounted in the electronic weighing device and the design of the parts, etc.
  • the update interval of the measured value can be obtained based on the accuracy of the logically mounted clock unit.
  • the accuracy of the clock unit is in the order of ppm in the crystal oscillator, and the time error factor in calculating the flow rate is small enough to be ignored.
  • the electronic weighing device According to the electronic weighing device according to the inventions of claims 1 and 2 of the present application, it is possible to eliminate an error that occurs at the time of flow rate calculation and to provide an accurate flow rate measurement result with high accuracy. In addition, according to the electronic weighing device according to the invention of claim 3 of the present application, it is possible to visually confirm the accurate measurement value and flow rate value displayed on the display unit.
  • the schematic block diagram which similarly shows the flow volume calculation state of a liquid.
  • the flowchart which similarly shows processing operation.
  • Schematic which shows the structural example in the case of measuring the injection quantity to the conventional container.
  • Schematic which shows the structural example in the case of measuring the discharge
  • Schematic which shows the example of a structure in the case of performing the conventional flow control.
  • the timing chart which shows the example which the reference time signals of an electronic balance and an external apparatus are synchronizing.
  • the timing chart which shows the example which the reference time signal of an electronic balance and an external apparatus is not synchronizing.
  • the electronic balance 10 includes a load sensor unit 1 including a weighing table 1 a on which a container 21 for injecting a liquid to be weighed, an A / D conversion unit 2, and an arithmetic processing unit 3.
  • a clock generation circuit 4 that is a clock unit having a crystal resonator that outputs a reference time signal and an analog load signal output from the load sensor unit 1 are digitally converted into load data every time the reference time signal is received.
  • the load data output from the A / D converter 2 and the A / D converter 2 is converted into a measured value every time a reference time signal is received, and the amount of change per unit time of the measured value is calculated to obtain a flow rate.
  • An arithmetic processing unit 3 composed of a CPU for obtaining the data, a memory 5 that stores various data necessary for arithmetic processing in the arithmetic processing unit 3, a display unit 6 that displays data such as measurement results, and various data Input / output Consisting of radical 19 serving as a key switch unit 7, and the interface unit 8.
  • commands such as so-called “tare” and “measurement value output” to the electronic balance 10 are performed by the operator via the key switch unit 7, and these command signals are input to the arithmetic processing unit 3. It is processed. Further, when the flow rate value is output to an external device (not shown) such as a personal computer, or the command from the external device is performed via the interface unit 8, these command signals are input to the arithmetic processing unit 3. It is processed. Further, as shown in FIG. 2, the liquid in the tank 22 is injected into the container 21 by a pump 23.
  • the recording interval (T) which is a unit time for calculating the flow rate
  • the measured value update count (m) corresponding to the recording interval and the actual recording interval ( ⁇ t) are calculated from the recorded recording interval (T) and the measured value update interval (t R ) specific to the electronic balance 10.
  • the recording interval (T) may be a rough guide rather than a strict value.
  • the input recording interval (T) is 1 second and the measurement value update interval (t R ) is 0.19 seconds
  • the measurement value update count (m) corresponding to the recording interval and the actual recording interval ( ⁇ t) are recorded in the memory 5 for use in later processing.
  • a flow rate measuring operation is started (step 103).
  • the load data output from the A / D converter 2 is corrected and converted into a measured value, and this measured value is updated every time the reference time signal is received. .
  • Metric is updated (step 104), as the first metric w 0 at the start of measurement, recorded in the memory 5 (step 105).
  • the counter (hereinafter referred to as CNT) of the arithmetic processing unit 3 adds +1 every time the measured value is updated, and is used to record the measured value every m times of the updated measured value. Is initialized to zero to record the metric value after m times (step 106).
  • Metric is updated (step 109), CNT is incremented by one (step 110), the weighing value of the update and reaches m times (step 111), the memory 5 the weight value at that time (w i) (Step 112).
  • This measured value (w i ) may be displayed on the display unit 6. Since the next measurement value is recorded when the measurement value is updated again m times, the CNT value is cleared to zero (step 113).
  • Step 116 If there is a request to output the flow rate value (Q i ) to an external device (step 116), the flow rate value is output via the interface unit 8 (step 117). After that, or when there is no request for output of the flow value, the process returns to Step 107, and if the stop of the liquid flow process is not input from the key switch unit 7, the operation from Step 109 to Step 117 is repeated while it is input. The processing operation is terminated (step 108).
  • the input of the recording interval (T) for calculating the flow rate (see step 101), the flow measurement start instruction (see step 103), and the flow measurement stop instruction (see step 107) are received from the key switch unit 7. Instead of the input, it may be performed by a command from an external device connected to the interface unit 8.
  • a display unit different from the display unit 6 may be provided there, but there is an extra display space. If not, for example, by operating the key switch unit 7 of the electronic balance or a separately provided switching key (not shown), the display unit 6 is temporarily or temporarily replaced with the display unit 6 instead of the original mass display.
  • the flow rate value may be continuously displayed until a switching signal is input.
  • the output of the flow rate from the electronic balance 10 to an external device may be performed by an output command from the external device or a key operation mounted on the electronic balance 10.
  • an output command from the external device or a key operation mounted on the electronic balance 10. if you want to check whether the target flow rate is within the allowable range, set the upper and lower limit values for the target flow rate. When the flow rate exceeds the upper limit value or falls below the lower limit value, a buzzer sound or warning is displayed. If the alarm action is performed, the convenience will be improved.
  • the measured flow rate is “mass / hour”, but if the liquid can be specified, the mass is converted to the unit of “volume / hour” by correcting the density with the density. It is also possible.
  • the density of a plurality of liquids is stored in the memory 5 of the electronic balance 10 in advance, density correction data is read out by selecting the liquid during flow rate measurement, and the flow rate is output in “volume / time” It becomes possible to do.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Provided is an electronic weighing device, such as an electronic balance, having a flow calculation function, which is able to eliminate an error that occurs when the flow is calculated and accurately obtain an exact flow measurement result. An electronic weighing device having a flow calculation function comprises: a load sensor unit (1) which is provided with a weighing table (1a); a clock generation circuit (4) which generates a reference time signal; an A/D conversion unit (2) which converts an analog load signal outputted from the load sensor unit (1) into digital load data every time receiving the reference time signal; an arithmetic processing unit (3) which converts the load data outputted from the A/D conversion unit (2) into a weighed value by performing a correction operation every time receiving the reference time signal, calculates the change amount per unit time of the weighed value, and finds the flow amount; a display unit (6) which displays data such as the weighed value or a flow amount value outputted from the arithmetic processing unit (3); a memory (5) which stores various kinds of data; and an input/output unit which is composed of a key switch unit (7) and an interface unit (8) and to/from which the various kinds of data are inputted/outputted.

Description

流量算出機能を有する電子計量装置Electronic weighing device with flow rate calculation function
　本発明は、電子天びん、電子はかり等の電子計量装置に関し、特に、液体や粉粒体の流量算出機能を有する電子計量装置に関する。 The present invention relates to an electronic weighing device such as an electronic balance and an electronic balance, and more particularly to an electronic weighing device having a function of calculating a flow rate of a liquid or a granular material.
　従来から、微少な流量を精度よく測定したい場合には、感度が高い測定器である電子計量装置、例えば電子天びんを用いることが多い。具体的には、液体を移送するポンプなどの機器は、流量の正確さ・安定度が、機器の性能として重要になるので、機器の性能確認や機器毎の調整のため、流量を測定する場合がある。この場合に、特に流量が微少となる機器では、電子天びんと当該電子天びんに接続したパソコンなどの外部機器を利用して流量を測定するのが一般的である。 Conventionally, when it is desired to accurately measure a minute flow rate, an electronic weighing device, for example, an electronic balance, which is a highly sensitive measuring instrument, is often used. Specifically, for devices such as pumps that transfer liquids, the accuracy and stability of the flow rate are important as the performance of the device, so when measuring the flow rate for checking the performance of the device and adjusting each device. There is. In this case, particularly in a device with a very small flow rate, the flow rate is generally measured using an electronic balance and an external device such as a personal computer connected to the electronic balance.
　そして、電子天びんを利用した流量の測定は、一般に次のように行なわれる。
　第１に、容器への注入量を計量する場合は、図４に示すように、電子天びんの秤量台に容器を載せて、ポンプなどの機器によりタンクから容器に注入される液体の質量を、電子天びんで計量可能に構成する一方、電子天びんに接続されたパソコンなどの外部機器では、一定間隔（記録間隔：Δｔ）毎に、電子天びんの計量値を記録できるようにする。そして、液体の注入による液体の質量変化と、記録間隔（Δｔ）により、流量を算出する。第２に、タンクから容器に排出される液体の質量を測定する場合には、図５に示すように、電子天びんの秤量台にタンクを載せて、上述と同様にしてタンク内の液体の排出量を算出する。 And the measurement of the flow volume using an electronic balance is generally performed as follows.
First, when measuring the amount to be injected into a container, as shown in FIG. 4, the container is placed on a weighing platform of an electronic balance, and the mass of liquid injected from the tank into the container by a device such as a pump is determined. While the electronic balance is configured to be capable of weighing, an external device such as a personal computer connected to the electronic balance can record the weighing value of the electronic balance at regular intervals (recording interval: Δt). Then, the flow rate is calculated from the change in the mass of the liquid caused by the liquid injection and the recording interval (Δt). Second, when measuring the mass of the liquid discharged from the tank to the container, as shown in FIG. 5, the tank is placed on the weighing platform of the electronic balance, and the liquid in the tank is discharged in the same manner as described above. Calculate the amount.
　ここで、パソコンなどの外部機器による流量算出の具体的方法を説明すると、まず、外部機器は、測定開始の時刻ｔ０時の計量値ｗ０を記録する。次いで、時刻ｔ０から記録間隔（Δｔ）経過後の時刻ｔ１にて、同様に計量ｗ１を記録する。このようにして、記録間隔（Δｔ）毎の、時刻ｔ０、ｔ１、ｔ２・・・ｔｎの時の計量値ｗ０、ｗ１、ｗ２・・・ｗｎを刻々と記録する。そして、時刻ｔｎ時の流量Ｑｎを、「その時の計量値と前回の計量値との差分により求める」とすることで、次の式から所定の時刻ｔｎ　における流量Ｑｎを求めることができる。
Ｑｎ　＝（ｗｎ　－　ｗｎ－１）／Δｔ Here, a specific method of calculating the flow rate by an external device such as a personal computer will be described. First, the external device records the measured value w 0 at the measurement start time t 0 . Next, the measurement w 1 is similarly recorded at time t 1 after the elapse of the recording interval (Δt) from time t 0 . In this way, for each recording interval (Delta] t), the time t 0, t 1, t metric w 0 when the 2 ··· t n, w 1, w constantly records the 2 · · · w n . Then, the flow rate Q n at time t n, by a "determined by the difference between the weight value and the previous weight value at that time", that determine the flow rate Q n from the following equation at a predetermined time t n it can.
Q n = (w n −w n−1 ) / Δt
　また、細胞培養などでは、培養時の条件を定量化するため、培養液や薬液を培地に投入・排出する際に、規定の目標流量に制御したい場合がある。この場合には、図６に示す構成で、上述した方法で現在の流量を求め、目標流量となるよう、目標流量と現在流量の差から、外部機器からポンプに対して流量の調整、すなわち流量制御が行われる。 In addition, in cell culture and the like, in order to quantify the culture conditions, there are cases where it is desired to control the flow rate to a specified target when a culture solution or a chemical solution is charged into or discharged from the medium. In this case, in the configuration shown in FIG. 6, the current flow rate is obtained by the above-described method, and the flow rate is adjusted from the external device to the pump from the difference between the target flow rate and the current flow rate, so that the target flow rate is obtained. Control is performed.
　さらに、液体だけではなく、微少量の粉体の切り出し時の流量の測定においても、感度が高い電子天びんが使用されている（特許文献１）。 Furthermore, not only liquids but also electronic balances with high sensitivity are used in measuring the flow rate when cutting out a small amount of powder (Patent Document 1).
特開２０１１－５８８８５号公報JP 2011-58885 A
　しかしながら、従来においては、パソコンなどの外部機器は、内部のクロック（例えば水晶発振子）を基にした時間管理が行われており、記録間隔（Δｔ）毎に、電子天びんの計量値を記録する処理を行う一方、電子天びんは、同じく内部のクロック（例えば水晶発振子）を基にした時間管理が行われており、所定時間毎に計量の更新を行い、外部機器からの計量値要求信号を受けると、受信直前あるいは受信直後のあらかじめ決められた一方の計量値を外部機器に送っている。このため、外部機器と電子天びんの各内部クロックの同期をとることは実際上不可能となり、各内部クロックの差を原因とした電子天びんにおける計量の更新と外部機器の計量値要求信号の送信のタイミングのずれによって、正確な流量計算ができないという不都合があった。 Conventionally, however, an external device such as a personal computer is time-controlled based on an internal clock (for example, a crystal oscillator), and records the weighing value of the electronic balance at every recording interval (Δt). On the other hand, the electronic balance is also time-controlled based on an internal clock (for example, a crystal oscillator), and updates the measurement every predetermined time and sends a measurement value request signal from an external device. Upon receipt, one of the predetermined measurement values immediately before reception or immediately after reception is sent to the external device. For this reason, it is practically impossible to synchronize the internal clocks of the external device and the electronic balance, and it is not possible to update the weighing in the electronic balance due to the difference between the internal clocks and transmit the weighing value request signal of the external device. There was an inconvenience that the flow rate could not be calculated accurately due to the timing shift.
　この不都合が生じる原因を、例えば、外部機器が電子天びんの計量値を１秒毎に記録（記録間隔（Δｔ＝１秒））することを目標とし、電子天びんの計量値の更新間隔が０．２秒（１秒間に５回更新）とする場合について説明する。
　外部機器は、内部クロックにより、記録間隔（Δｔ＝１秒）毎に、電子天びんの計量値を記録する処理を以下の手順で行う。
（１）外部機器は、記録間隔のタイミングになると、電子天びんに対して計量値を出力させる指示である計量値要求信号の発行を行う。
（２）電子天びんは、計量値要求信号により、あらかじめ決められているところにしたがい、次に計量値が更新される際に計量値を出力するか、あるいは直前に更新された計量値を外部機器に出力する。
（３）外部機器は、電子天びんから出力された計量値を記録し、前回に記録した計量値と、記録間隔から、Ｑｎ　＝（ｗｎ　－　ｗｎ－１）／Δｔの式により、流量を算出する。 The cause of this inconvenience is, for example, that the external device records the weighing value of the electronic balance every second (recording interval (Δt = 1 second)), and the updating interval of the weighing value of the electronic balance is 0. The case of 2 seconds (updated 5 times per second) will be described.
The external device performs processing of recording the weighing value of the electronic balance at the recording interval (Δt = 1 second) by the internal clock according to the following procedure.
(1) When the timing of the recording interval is reached, the external device issues a measurement value request signal that is an instruction to output a measurement value to the electronic balance.
(2) The electronic balance outputs the measured value when the measured value is updated next, or sends the measured value that was updated immediately before to the external device, according to the position determined in advance by the measured value request signal. Output to.
(3) The external device records the measurement value output from the electronic balance, and calculates the flow rate from the previously recorded measurement value and the recording interval according to the formula Q n = (w n −w n−1 ) / Δt. Is calculated.
　図７に示すように、上記（１）での計量値要求信号の発行が、正確に１秒毎に、電子天びんに対して計量値の出力を要求し、電子天びんの計量値の更新間隔が、正確に０．２秒である場合は、計量値の更新５回毎に必ず１回、計量値が外部機器に出力され、記録される。よって、上記式に従った流量の計算は、常に正しく行われる。 As shown in FIG. 7, the issuance of the weighing value request signal in the above (1) requests the electronic balance to output the weighing value accurately every second, and the updating interval of the weighing value of the electronic balance is If it is exactly 0.2 seconds, the measured value is output to the external device and recorded every time the measured value is updated five times. Therefore, the calculation of the flow rate according to the above formula is always performed correctly.
　しかし、上述したように、外部機器や電子天びんは、それぞれの機器に搭載された個々のクロックを基にした時間管理を行っており、両クロックの同期をとることは実際上不可能である。そして、外部機器と電子天びんにおける両クロックの同期がとれない限り、外部機器による一定間隔の計量値の記録処理においては、何回かに一度電子天びんの計量値の更新間隔の１回分のずれが発生することは、原理的に避けられない。その結果、実際の流量は一定であっても、計算される流量は周期的に変化し、使用者にとって使いにくいものとなっていた。 However, as described above, external devices and electronic balances perform time management based on individual clocks mounted on each device, and it is practically impossible to synchronize both clocks. As long as the clocks of the external device and the electronic balance are not synchronized, in the process of recording the measurement value at regular intervals by the external device, the deviation of the update value of the measurement value of the electronic balance once is several times. It is unavoidable in principle to occur. As a result, even if the actual flow rate is constant, the calculated flow rate changes periodically, making it difficult for the user to use.
　例えば、電子天びんの計量値の更新が、厳密に０．２秒でなく、－５％ずれた０．１９秒であった場合は、図８に示すように、外部機器が１秒毎に計量値要求信号を発行しても、－５％ずれることによって計量値の更新が５回毎で記録する場合と、６回で記録する場合が生じ、このとき計量値の実際の記録間隔は、
　計量値の更新が５回で記録した場合は、０．１９秒×５回＝０．９５秒
　計量値の更新が６回で記録した場合は、０．１９秒×６回＝１．１４秒
となり、外部機器は１秒毎の計量値の変化を検出できず、０．９５秒毎や１．１４秒毎の計量値の変化を記録することになる。よって実際の流量に対し、算出される流量の誤差は、更新が５回の場合は－５％、６回の場合は＋１４％となってしまう。 For example, if the weight value of the electronic balance is not exactly 0.2 seconds but 0.15 seconds shifted by -5%, the external device weighs every second as shown in FIG. Even if the value request signal is issued, the measurement value update is recorded every 5 times due to a deviation of -5%, and there are cases where the measurement value is recorded every 6 times.
If the measurement value update is recorded 5 times, 0.19 seconds x 5 times = 0.95 seconds If the measurement value update is recorded 6 times, 0.19 seconds x 6 times = 1.14 seconds Thus, the external device cannot detect the change in the measurement value every second, and records the change in the measurement value every 0.95 seconds or every 1.14 seconds. Therefore, the calculated flow rate error is −5% when the update is performed 5 times, and + 14% when the update is performed 6 times.
　従来、上記誤差を低減する方法として、第１に、天びんの計量値の更新間隔を短くする、第２に、外部機器による計量値の記録間隔を長くする、という２つの方法が取られている。 Conventionally, as a method for reducing the error, two methods have been adopted: firstly, the update interval of the weighing value of the balance is shortened, and secondly, the interval of the measurement value recording by the external device is lengthened. .
　すなわち、第１の方法によると、外部機器が、同じく１秒毎に計量値要求信号を発行する場合でも、電子天びんの計量値の更新間隔が０．１９秒毎から０．０１９秒毎の１／１０に短縮すると、外部機器による計量値の記録は、電子天びんの計量値の更新が、５２回毎に記録される場合と、５３回毎に記録される場合が発生することになる。 That is, according to the first method, even when the external device similarly issues a weighing value request signal every second, the weighing value update interval of the electronic balance is 1 every 0.19 seconds to every 0.019 seconds. When the value is shortened to / 10, the measurement value recorded by the external device may be recorded every 52 times or every 53 times when the measurement value of the electronic balance is updated.
　そして、このときの計量値の実際の記録間隔は、計量値の更新が５２回で記録した場合は、０．０１９秒×５２回＝０．９８８秒であり、計量値の更新が５３回で記録した場合は、０．０１９秒×５３回＝１．００７秒
である。したがって、目標の記録間隔１秒に対して、更新が５２回の場合は－１．２％、５３回の場合は＋０．７％となり、実際の流量に対して、算出される流量の誤差も同様となる。よって、電子天びんの計量値の更新間隔を短縮することで、計算される流量の誤差が小さくなる。 The actual recording interval of the measurement value at this time is 0.019 seconds × 52 times = 0.888 seconds when the update of the measurement value is recorded 52 times, and the update of the measurement value is 53 times. In the case of recording, it is 0.019 seconds × 53 times = 1.007 seconds. Therefore, for the target recording interval of 1 second, the update is -1.2% for 52 times and + 0.7% for 53 times, and the calculated flow rate error is also different from the actual flow rate. It becomes the same. Therefore, by shortening the update interval of the weighing value of the electronic balance, the calculated flow rate error is reduced.
　また、第２の方法によると、電子天びんの計量値の更新間隔は０．１９秒毎のままで、外部機器による計量値の記録間隔（計量値要求信号の発行間隔）を１秒から１０秒に変更すると、外部機器による計量値の記録は、電子天びんの計量値の更新が、５２回毎で記録される場合と、５３回毎に記録される場合が発生することになる。 In addition, according to the second method, the measurement value update interval of the electronic balance remains every 0.19 seconds, and the measurement value recording interval (measurement value request signal issuance interval) by the external device is 1 to 10 seconds. If the value is changed to, the weighing value recorded by the external device may be recorded every 52 times or every 53 times when the weighing value of the electronic balance is updated.
　そして、このときの計量値の実際の記録間隔は、更新が５２回の場合の経過時間は、０．１９秒×５２回＝９．８８秒であり、５３回の場合の経過時間は、０．１９秒×５３回＝１０．０７秒
である。したがって、目標の記録間隔１０秒に対して、更新が５２回の場合は－１．２％、５３回の場合は、＋０．７％となり、実際の流量に対して、算出される流量の誤差も同様となる。よって、外部機器による計量値の記録間隔を長くすることで、計算される流量の誤差が小さくなる。 The actual measurement interval of the measured value at this time is 0.19 seconds × 52 times = 9.88 seconds when the update is 52 times, and the elapsed time when the number is 53 times is 0. 19 seconds × 53 times = 10.07 seconds. Therefore, for the target recording interval of 10 seconds, the update is -1.2% for 52 times, and + 0.7% for 53 times, and the calculated flow rate error with respect to the actual flow rate. Is the same. Therefore, the error in the calculated flow rate is reduced by increasing the recording interval of the measurement value by the external device.
　しかしながら、第１の方法によると、電子天びんは、計量値の更新をより頻繁に行うことが必要であり、高速処理が可能となる設計が必要となって、電子天びん本体のコスト増に繋がる、という不都合がある。また、第２の方法によると、流量を算出するまでの計測時間が長くなるため、実際の流量変化に対する応答性が悪くなり、流量変化の検出が遅くなる、という不都合がある。また、第１、第２のいずれの方法も、流量を算出する場合に発生する誤差を小さくするための方法であり、理論的に誤差を完全に無くすことはできない。 However, according to the first method, the electronic balance needs to be updated more frequently, and a design that enables high-speed processing is required, leading to an increase in the cost of the electronic balance body. There is an inconvenience. In addition, according to the second method, since the measurement time until the flow rate is calculated becomes long, there is a disadvantage that the response to the actual flow rate change is deteriorated and the detection of the flow rate change is delayed. In addition, both the first and second methods are methods for reducing an error that occurs when the flow rate is calculated, and the error cannot theoretically be completely eliminated.
　本発明はこれら従来の不都合をすべて解消し、電子天びんなどの電子計量装置を利用した流量計測において、外部機器で流量を算出する場合に発生していた誤差の問題を無くし、正確な流量の測定結果を得られる流量算出機能を有する電子計量装置を提供することを目的とする。 The present invention eliminates all of these conventional inconveniences, eliminates the problem of error that occurs when calculating the flow rate with an external device in flow measurement using an electronic weighing device such as an electronic balance, and accurately measures the flow rate. An object of the present invention is to provide an electronic weighing device having a flow rate calculation function capable of obtaining a result.
　この目的を達成するために、本発明の請求項１に係る流量算出機能を有する電子計量装置は、荷重センサ部と、基準時間信号を生成するクロック部と、このクロック部からの基準時間信号を受けると前記荷重センサ部から出力されたアナログの荷重信号をデジタルの荷重データに変換するＡ／Ｄ変換部と、前記クロック部からの基準時間信号を受けると前記Ａ／Ｄ変換部から出力された荷重データを補正演算して計量値に換算し、この計量値の単位時間あたりの変化量を算出して流量を求める演算処理部と、この演算処理部から出力された所定データを表示する表示部と、前記演算処理部における演算処理に必要な各種データを記憶する記憶部と、前記演算処理部と外部機器との間で各種データを入出力する入出力部と、からなる。 In order to achieve this object, an electronic weighing device having a flow rate calculation function according to claim 1 of the present invention includes a load sensor unit, a clock unit that generates a reference time signal, and a reference time signal from the clock unit. When received, the analog load signal output from the load sensor unit is converted into digital load data, and when the reference time signal is received from the clock unit, the A / D converter outputs the analog load signal. An arithmetic processing unit that corrects load data and converts it to a measured value, calculates the amount of change per unit time of the measured value to obtain a flow rate, and a display unit that displays predetermined data output from the arithmetic processing unit And a storage unit for storing various data necessary for arithmetic processing in the arithmetic processing unit, and an input / output unit for inputting / outputting various data between the arithmetic processing unit and an external device.
　また、本発明の請求項２に係る流量算出機能を有する電子計量装置は、上述の請求項１の構成において、前記記憶部は、前記演算処理部でクロック部からの基準時間信号により新たに換算される計量値が所定回数更新される毎に記録し、前記演算処理部は、前記記憶部に前回記録された計量値と今回記録された計量値との差分を単位時間である各計量値の記録間隔で除算して流量を求めることを特徴とする。 According to a second aspect of the present invention, there is provided an electronic measuring apparatus having a flow rate calculation function according to the first aspect, wherein the storage unit is newly converted by a reference time signal from a clock unit in the arithmetic processing unit. The measured value is recorded every time the measured value is updated a predetermined number of times, and the arithmetic processing unit calculates the difference between the measured value previously recorded in the storage unit and the currently recorded measured value for each measured value that is a unit time. The flow rate is obtained by dividing by the recording interval.
　さらに、本発明の請求項３に係る流量算出機能を有する電子計量装置は、上述の請求項１または２の構成において、前記表示部に表示する所定のデータが、計量値と流量値であることを特徴とする。 Furthermore, in the electronic weighing apparatus having a flow rate calculation function according to claim 3 of the present invention, in the configuration of claim 1 or 2, the predetermined data displayed on the display unit is a measured value and a flow rate value. It is characterized by.
　上述の構成によって電子計量装置の荷重センサ部は、アナログの荷重信号をＡ／Ｄ変換部に出力し、Ａ／Ｄ変換部は、一定の時間間隔（更新間隔）で、すなわちクロック部で生成された基準時間信号を受ける毎に、荷重信号を荷重データにデジタル変換し、演算処理部に出力する。演算処理部は、クロック部で生成された基準時間信号を受ける毎に、Ａ／Ｄ変換部から出力された荷重データに対し、補正演算を行って計量値に換算し、この計量値の単位時間あたりの変化量を算出して、より具体的には、記憶部に前回記録された計量値と今回記録された計算値との差分を各計算値の記録間隔で除算して、流量を求め、表示部に前記演算処理部から出力された計量値及び流量値を表示する。 With the above configuration, the load sensor unit of the electronic weighing device outputs an analog load signal to the A / D conversion unit, and the A / D conversion unit is generated at a constant time interval (update interval), that is, at the clock unit. Each time the reference time signal is received, the load signal is digitally converted into load data and output to the arithmetic processing unit. Every time the arithmetic processing unit receives the reference time signal generated by the clock unit, it performs a correction operation on the load data output from the A / D conversion unit to convert it into a measured value, and a unit time of this measured value More specifically, the difference between the measured value recorded last time in the storage unit and the calculated value recorded this time is divided by the recording interval of each calculated value to obtain the flow rate. The measurement value and the flow rate value output from the arithmetic processing unit are displayed on the display unit.
　このように、計量値から流量を算出する機能を、電子計量装置に搭載した演算処理部が備え、また、前記計量値の更新間隔は、電子計量装置の設計によって固有のものに決定される。具体的には、電子計量装置内部に搭載された、例えば水晶発振子からなるクロック部からの基準時間を基にした処理と部品等の設計に依存して、計量値の更新間隔が決まるので、計量値の更新間隔については、論理的に搭載したクロック部の精度に基づいて求めることが可能となる。そして、クロック部の精度は、水晶発振子ではｐｐｍオーダーであり、流量を算出する際の時間的な誤差要因としては、無視できる程度に小さい。このように、従来はパソコンなどの外部機器で行なっていた流量の算出を、電子計量装置自身で行い、完結した流量データとし、電子計量装置の表示部に流量値を表示したり、あるいは外部機器から要求された時に、この流量データを電子計量装置から外部機器に送信することにより、基準時間が同期しないことによる誤差がなくなり、精度良く流量を算出することが可能となる。 Thus, the arithmetic processing unit mounted on the electronic weighing device has a function of calculating the flow rate from the measured value, and the update interval of the measured value is determined to be unique depending on the design of the electronic weighing device. Specifically, the measurement value update interval is determined depending on the processing based on the reference time from the clock unit made of a crystal oscillator, for example, mounted in the electronic weighing device and the design of the parts, etc. The update interval of the measured value can be obtained based on the accuracy of the logically mounted clock unit. The accuracy of the clock unit is in the order of ppm in the crystal oscillator, and the time error factor in calculating the flow rate is small enough to be ignored. In this way, the calculation of the flow rate that was conventionally performed by an external device such as a personal computer is performed by the electronic weighing device itself, and the flow rate value is displayed on the display unit of the electronic weighing device, or the external flow rate data is displayed. By transmitting this flow rate data from the electronic metering device to an external device when requested by the controller, there is no error due to the reference time not being synchronized, and the flow rate can be accurately calculated.
　本願の請求項１及び２の発明に係る電子計量装置によれば、流量算出時に発生する誤差をなくし、精度良く正確な流量の測定結果を提供することができる。また、本願の請求項３の発明に係る電子計量装置によれば、表示部に表示した正確な計量値と流量値を視覚により確認できる。 According to the electronic weighing device according to the inventions of claims 1 and 2 of the present application, it is possible to eliminate an error that occurs at the time of flow rate calculation and to provide an accurate flow rate measurement result with high accuracy. In addition, according to the electronic weighing device according to the invention of claim 3 of the present application, it is possible to visually confirm the accurate measurement value and flow rate value displayed on the display unit.
本発明を電子天びんに適用した場合の内部構成を示すブロック図。The block diagram which shows an internal structure at the time of applying this invention to an electronic balance. 同じく液体の流量算出状態を示す概略的構成図。The schematic block diagram which similarly shows the flow volume calculation state of a liquid. 同じく処理動作を示すフロー図。The flowchart which similarly shows processing operation. 従来の容器への注入量を計量する場合の構成例を示す概略図。Schematic which shows the structural example in the case of measuring the injection quantity to the conventional container. 従来の容器への排出量を計量する場合の構成例を示す概略図。Schematic which shows the structural example in the case of measuring the discharge | emission amount to the conventional container. 従来の流量制御を行なう場合の構成例を示す概略図。Schematic which shows the example of a structure in the case of performing the conventional flow control. 電子天びんと外部機器との基準時間信号が同期している例を示すタイミングチャート。The timing chart which shows the example which the reference time signals of an electronic balance and an external apparatus are synchronizing. 電子天びんと外部機器との基準時間信号が同期していない例を示すタイミングチャート。The timing chart which shows the example which the reference time signal of an electronic balance and an external apparatus is not synchronizing.
　以下、本発明の好適な実施例を説明する。
　図１及び図２に示すように、電子天びん１０は、計量する液体を注入する容器２１を載置する秤量台１ａを備えた荷重センサ部１と、Ａ／Ｄ変換部２と演算処理部３に基準時間信号を出力する水晶振動子を備えたクロック部たるクロック発生回路４と、前記荷重センサ部１から出力されたアナログの荷重信号を、基準時間信号を受ける毎に荷重データにデジタル変換するＡ／Ｄ変換部２と、Ａ／Ｄ変換部２から出力された荷重データを、基準時間信号を受ける毎に計量値に換算し、この計量値の単位時間あたりの変化量を算出して流量を求めるＣＰＵからなる演算処理部３と、この演算処理部３における演算処理に必要な各種データを記憶する記憶部たるメモリ５と、計量結果などのデータを表示する表示部６と、各種データを入出力する入出力部たるキースイッチ部７及びインターフェイス部８とからなる。 Hereinafter, preferred embodiments of the present invention will be described.
As shown in FIGS. 1 and 2, the electronic balance 10 includes a load sensor unit 1 including a weighing table 1 a on which a container 21 for injecting a liquid to be weighed, an A / D conversion unit 2, and an arithmetic processing unit 3. A clock generation circuit 4 that is a clock unit having a crystal resonator that outputs a reference time signal and an analog load signal output from the load sensor unit 1 are digitally converted into load data every time the reference time signal is received. The load data output from the A / D converter 2 and the A / D converter 2 is converted into a measured value every time a reference time signal is received, and the amount of change per unit time of the measured value is calculated to obtain a flow rate. An arithmetic processing unit 3 composed of a CPU for obtaining the data, a memory 5 that stores various data necessary for arithmetic processing in the arithmetic processing unit 3, a display unit 6 that displays data such as measurement results, and various data Input / output Consisting of radical 19 serving as a key switch unit 7, and the interface unit 8.
　なお、Ａ／Ｄ変換部２や演算処理部３がクロック発生回路４に相当するものを内蔵している構成の場合は、クロック発生回路４を独立して設ける必要はない。また、電子天びん１０に対する、いわゆる「風袋引き」や「計量値の出力」などの指令は、操作者によりキースイッチ部７を介して行われ、これらの指令信号は演算処理部３に入力して処理される。さらに、流量値をパソコンなどの外部機器（図示せず）に出力する場合や、前記外部機器からの指令は、インターフェイス部８を介して行なわれ、これら指令信号は演算処理部３に入力して処理される。また、図２に示すように、容器２１にタンク２２内の液体がポンプ２３によって注入されるよう構成している。 Note that in the case where the A / D conversion unit 2 and the arithmetic processing unit 3 have a configuration corresponding to the clock generation circuit 4, it is not necessary to provide the clock generation circuit 4 independently. In addition, commands such as so-called “tare” and “measurement value output” to the electronic balance 10 are performed by the operator via the key switch unit 7, and these command signals are input to the arithmetic processing unit 3. It is processed. Further, when the flow rate value is output to an external device (not shown) such as a personal computer, or the command from the external device is performed via the interface unit 8, these command signals are input to the arithmetic processing unit 3. It is processed. Further, as shown in FIG. 2, the liquid in the tank 22 is injected into the container 21 by a pump 23.
　続いて、演算処理部３によってなされる流量算出に関する処理動作を図３に基づいて説明する。
　演算処理部３の初期処理がなされた後、操作者によるキースイッチ部７のキー操作によって、流量を算出する際の単位時間である記録間隔（Ｔ）が入力される（ステップ１０１）と、入力された記録間隔（Ｔ）と、電子天びん１０に固有の計量値の更新間隔（ｔＲ）から、記録間隔に対応する計量値の更新回数（ｍ）と、実際の記録間隔（Δｔ）を算出する（ステップ１０２）。前記記録間隔（Ｔ）は、厳密な値ではなくおおまかな目安でよく、例えば、入力された記録間隔（Ｔ）が１秒、計量値の更新間隔（ｔＲ）が０．１９秒の場合、計量値の更新回数は、Ｔ／ｔＲ＝５．２６・・・となり、計量値の更新５回毎（ｍ＝５）に計量値を記録するものとなる。また、実際の記録間隔（Δｔ）は、Δｔ＝ｔＲ×ｍ＝５回×０．１９秒／回＝０．９５秒となる。そして、記録間隔に対応する計量値の更新回数（ｍ）と、実際の記録間隔（Δｔ）は、後の処理で使用するので、メモリ５に記録する。 Next, processing operations relating to flow rate calculation performed by the arithmetic processing unit 3 will be described with reference to FIG.
After the initial processing of the arithmetic processing unit 3, the recording interval (T), which is a unit time for calculating the flow rate, is input by the key operation of the key switch unit 7 by the operator (step 101). The measured value update count (m) corresponding to the recording interval and the actual recording interval (Δt) are calculated from the recorded recording interval (T) and the measured value update interval (t R ) specific to the electronic balance 10. (Step 102). The recording interval (T) may be a rough guide rather than a strict value. For example, when the input recording interval (T) is 1 second and the measurement value update interval (t R ) is 0.19 seconds, The number of measurement value updates is T / t R = 5.26... And the measurement value is recorded every five measurement value updates (m = 5). The actual recording interval (Δt) is Δt = t R × m = 5 times × 0.19 seconds / times = 0.95 seconds. The measurement value update count (m) corresponding to the recording interval and the actual recording interval (Δt) are recorded in the memory 5 for use in later processing.
　操作者がポンプ２３を操作して、タンク２２から秤量台１ａ上の容器２１内に測定対象である液体の注入が開始され、キースイッチ部７から流量測定の開始指示信号が入力されると、流量測定動作を開始する（ステップ１０３）。 When the operator operates the pump 23 to start the injection of the liquid to be measured from the tank 22 into the container 21 on the weighing platform 1a, and the flow measurement start instruction signal is input from the key switch unit 7, A flow rate measuring operation is started (step 103).
　クロック発生回路４からの基準時間信号を受けるとＡ／Ｄ変換部２から出力された荷重データを補正演算して計量値に換算し、この計量値は前記基準時間信号を受ける毎に更新される。計量値が更新される（ステップ１０４）と、測定開始時の最初の計量値ｗ０として、メモリ５に記録する（ステップ１０５）。演算処理部３のカウンタ（以下、ＣＮＴという。）は、計量値の更新毎に＋１を加算するもので、計量値の更新ｍ回毎に計量値を記録するために利用され、計量値の更新がｍ回後に計量値を記録するよう、ゼロに初期化される（ステップ１０６）。 When the reference time signal from the clock generation circuit 4 is received, the load data output from the A / D converter 2 is corrected and converted into a measured value, and this measured value is updated every time the reference time signal is received. . Metric is updated (step 104), as the first metric w 0 at the start of measurement, recorded in the memory 5 (step 105). The counter (hereinafter referred to as CNT) of the arithmetic processing unit 3 adds +1 every time the measured value is updated, and is used to record the measured value every m times of the updated measured value. Is initialized to zero to record the metric value after m times (step 106).
　ここで、操作者がポンプ２３を操作して液体の注入を停止するとともに、電子天びん１０に対してキースイッチ部７から流量測定の処理停止を入力する（ステップ１０７）と、流量測定は終了する（ステップ１０８）一方、流量測定の処理停止指示が入力しない場合は、処理が続行される。 Here, when the operator operates the pump 23 to stop injecting the liquid and inputs the process stop of the flow measurement from the key switch unit 7 to the electronic balance 10 (step 107), the flow measurement ends. (Step 108) On the other hand, if the flow measurement stop instruction is not input, the process is continued.
　計量値が更新される（ステップ１０９）と、ＣＮＴは１を加算し（ステップ１１０）、計量値の更新がｍ回に達すると（ステップ１１１）、そのときの計量値（ｗｉ）をメモリ５に記録する（ステップ１１２）。この計量値（ｗｉ）を表示部６に表示してもよい。そして、次回の計量値の記録は、計量値の更新が再びｍ回に達したときに行うため、ＣＮＴ値をゼロにクリアする（ステップ１１３）。 Metric is updated (step 109), CNT is incremented by one (step 110), the weighing value of the update and reaches m times (step 111), the memory 5 the weight value at that time (w i) (Step 112). This measured value (w i ) may be displayed on the display unit 6. Since the next measurement value is recorded when the measurement value is updated again m times, the CNT value is cleared to zero (step 113).
　次いで、前回記録した計量値（ｗｉ－１）と今回の計量値（ｗｉ）、および記録間隔（Δｔ）から流量（Ｑｉ）を算出し（ステップ１１４）、算出した流量値（Ｑｉ）を表示部６に表示する（ステップ１１５）。 Next, the flow rate (Q i ) is calculated from the previously recorded measurement value (w i-1 ), the current measurement value (w i ), and the recording interval (Δt) (step 114), and the calculated flow rate value (Q i ) Is displayed on the display unit 6 (step 115).
　そして、流量値（Ｑｉ）を外部機器に出力する要求があれば（ステップ１１６）、インターフェイス部８を介して流量値を出力する（ステップ１１７）。その後、あるいは流量値出力の要求がない場合は、ステップ１０７に戻り、液体流量処理停止がキースイッチ部７から入力されていなければステップ１０９からステップ１１７までの動作を繰り返す一方、入力されていると処理動作を終了する（ステップ１０８）。 If there is a request to output the flow rate value (Q i ) to an external device (step 116), the flow rate value is output via the interface unit 8 (step 117). After that, or when there is no request for output of the flow value, the process returns to Step 107, and if the stop of the liquid flow process is not input from the key switch unit 7, the operation from Step 109 to Step 117 is repeated while it is input. The processing operation is terminated (step 108).
　なお、流量を算出する際の記録間隔（Ｔ）の入力（ステップ１０１参照）、流量測定の開始指示（ステップ１０３参照）、流量測定の停止指示（ステップ１０７参照）は、キースイッチ部７からの入力に換えて、インターフェイス部８に接続された外部機器からの指令により行ってもよい。また、電子天びん１０における流量の表示については、電子天びん１０に余分なスペースがある場合は、そこに表示部６とは別の表示部を設けて表示させてもよいが、余分な表示スペースがない場合は、たとえば電子天びんのキースイッチ部７や別途設けた切り替えキー（図示せず）を操作することにより、表示部６本来の質量表示に代わり、この表示部６に一時的にまたは次の切替え信号が入力するまで継続的に、流量値を表示させてもよい。さらに、電子天びん１０から、パソコンなどの外部機器への流量の出力は、外部機器からの出力指令や、電子天びん１０に搭載されたキー操作により、行わせてもよい。またさらに、目標流量に対して許容範囲内か否かを確認したい場合、目標流量に対する上限値、下限値を定め、流量が上限値を上回ったり、下限値を下回った際、ブザー音や警告表示によるアラーム動作を行えば、利便性がアップする。 The input of the recording interval (T) for calculating the flow rate (see step 101), the flow measurement start instruction (see step 103), and the flow measurement stop instruction (see step 107) are received from the key switch unit 7. Instead of the input, it may be performed by a command from an external device connected to the interface unit 8. In addition, regarding the display of the flow rate on the electronic balance 10, if there is an extra space in the electronic balance 10, a display unit different from the display unit 6 may be provided there, but there is an extra display space. If not, for example, by operating the key switch unit 7 of the electronic balance or a separately provided switching key (not shown), the display unit 6 is temporarily or temporarily replaced with the display unit 6 instead of the original mass display. The flow rate value may be continuously displayed until a switching signal is input. Further, the output of the flow rate from the electronic balance 10 to an external device such as a personal computer may be performed by an output command from the external device or a key operation mounted on the electronic balance 10. Furthermore, if you want to check whether the target flow rate is within the allowable range, set the upper and lower limit values for the target flow rate. When the flow rate exceeds the upper limit value or falls below the lower limit value, a buzzer sound or warning is displayed. If the alarm action is performed, the convenience will be improved.
　加えて、電子天びん１０を利用した流量計は、測定される流量は「質量／時間」となるが、液体が特定できれば、質量を密度で補正することにより「体積／時間」の単位に変換することも可能となる。この変化形としては、予め複数の液体の密度を電子天びん１０のメモリ５に記憶しておき、流量測定時に液体を選択することによって密度補正のデータを読み出し、「体積／時間」で流量を出力することが可能となる。 In addition, in the flowmeter using the electronic balance 10, the measured flow rate is “mass / hour”, but if the liquid can be specified, the mass is converted to the unit of “volume / hour” by correcting the density with the density. It is also possible. As this variation, the density of a plurality of liquids is stored in the memory 5 of the electronic balance 10 in advance, density correction data is read out by selecting the liquid during flow rate measurement, and the flow rate is output in “volume / time” It becomes possible to do.
１　　　荷重センサ部
１ａ　　　秤量台
２　　　Ａ／Ｄ変換部
３　　　演算処理部
４　　　クロック発生回路
５　　　メモリ
６　　　表示部
７　　　キースイッチ部
８　　　インターフェイス部
１０　　　電子天びん
２１　　　容器
２２　　　タンク
２３　　　ポンプ DESCRIPTION OF SYMBOLS 1 Load sensor part 1a Weighing base 2 A / D conversion part 3 Operation processing part 4 Clock generation circuit 5 Memory 6 Display part 7 Key switch part 8 Interface part 10 Electronic balance 21 Container 22 Tank 23 Pump

Claims (3)

  1. 　荷重センサ部と、基準時間信号を生成するクロック部と、このクロック部からの基準時間信号を受けると前記荷重センサ部から出力されたアナログの荷重信号をデジタルの荷重データに変換するＡ／Ｄ変換部と、前記クロック部からの基準時間信号を受けると前記Ａ／Ｄ変換部から出力された荷重データを補正演算して計量値に換算し、この計量値の単位時間あたりの変化量を算出して流量を求める演算処理部と、この演算処理部から出力された所定データを表示する表示部と、前記演算処理部における演算処理に必要な各種データを記憶する記憶部と、前記演算処理部と外部機器との間で各種データを入出力する入出力部と、からなることを特徴とする流量算出機能を有する電子計量装置。 A load sensor unit, a clock unit that generates a reference time signal, and an A / D conversion that converts an analog load signal output from the load sensor unit into digital load data upon receiving a reference time signal from the clock unit And a reference time signal from the clock unit, the load data output from the A / D converter is corrected and converted into a measured value, and a change amount of the measured value per unit time is calculated. An arithmetic processing unit for obtaining a flow rate, a display unit for displaying predetermined data output from the arithmetic processing unit, a storage unit for storing various data necessary for arithmetic processing in the arithmetic processing unit, and the arithmetic processing unit, An electronic weighing device having a flow rate calculation function, comprising: an input / output unit that inputs and outputs various data to and from an external device.
  2. 　前記記憶部は、前記演算処理部でクロック部からの基準時間信号により新たに換算される計量値が所定回数更新される毎に記録し、前記演算処理部は、前記記憶部に前回記録された計量値と今回記録された計量値との差分を単位時間である各計量値の記録間隔で除算して流量を求めることを特徴とする請求項１記載の流量算出機能を有する電子計量装置。 The storage unit records each time a measurement value newly converted by a reference time signal from the clock unit in the arithmetic processing unit is updated a predetermined number of times, and the arithmetic processing unit is recorded in the storage unit last time. 2. The electronic weighing apparatus having a flow rate calculation function according to claim 1, wherein the flow rate is obtained by dividing a difference between the measured value and the currently recorded measured value by a recording interval of each measured value which is a unit time.
  3. 　前記表示部に表示する所定のデータは、計量値と流量値であることを特徴とする請求項１または２記載の流量算出機能を有する電子計量装置。 3. The electronic weighing apparatus having a flow rate calculation function according to claim 1, wherein the predetermined data displayed on the display unit is a measured value and a flow rate value.
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JP6762218B2 (en) * 2016-12-13 2020-09-30 株式会社堀場エステック Flow rate calculation system and flow rate calculation method
JP7011882B2 (en) * 2018-01-24 2022-01-27 株式会社エー・アンド・デイ Weighing device with flow meter function

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JP2012063263A (en) * 2010-09-16 2012-03-29 Yamato Scale Co Ltd Quantitative supply device

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JPH0416914Y2 (en) * 1984-04-09 1992-04-15
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JP2012063263A (en) * 2010-09-16 2012-03-29 Yamato Scale Co Ltd Quantitative supply device

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Publication number Priority date Publication date Assignee Title
CN106323391A (en) * 2015-06-30 2017-01-11 株式会社堀场Stec Flow rate measuring device and flow rate controlling device
CN106323391B (en) * 2015-06-30 2020-04-21 株式会社堀场Stec Flow rate measuring device and flow rate control device

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