KR20010104654A - Compensating method and device for instrumental error in positive displacement type flowmeter - Google Patents

Abstract

(assignment)

Between the indicated flow rate indicated by the rotational movement of the metering element of the flowmeter and the measured value, the error caused by the change in viscosity, volume expansion, and instrument error characteristics of the meter body due to the temperature change of the measured body is eliminated. The present invention relates to a method for acquiring an instrument error correction method for a volumetric flowmeter for the purpose of correcting and giving an accurate flow indication.

(Solution)

Since the error correction value of the volume change, the viscosity change, and the characteristic change of the characteristic characteristics of the fluid, which are error factors of the volumetric flowmeter, are obtained in real time, correction is performed by means of high resolution from the viscosity measurement by a temperature sensor with high measurement accuracy. Compensation is performed by converting into a reference value using the value.In particular, ROM which inputs data of unique instrument error according to the change of the viscosity and specific gravity of the fluid according to the change of the micro temperature during the process and the change of the temperature of the system base. An instrument compensator for displaying an accurate flow rate using an electronic compensator equipped with a pressure gauge and a rotating body of a dual rotor volumetric flowmeter without resistance, and has a system base structure having a stable metering function. By correcting with an electronic correction device, an ultra high precision weighing function is obtained.

Description

Instrument error correction method and device for volumetric flowmeters {COMPENSATING METHOD AND DEVICE FOR INSTRUMENTAL ERROR IN POSITIVE DISPLACEMENT TYPE FLOWMETER}

The present invention relates to an improved method and apparatus for an industrial machine for highly accurate metering of a fluid flowing in a pipe.

Volumetric flowmeters have excellent measurement functions for measurement fluids with low viscosity indexes, but have large measurement coefficients of viscosity change due to temperature conditions. Even a slight temperature change produces an error accompanied by a change in viscosity. High precision is achieved by precise temperature control, but the constant temperature equipment costs are high, so accurate metering is displayed by the function of correcting the instrument error leaking from the gap of the metering chamber due to the change of the viscosity of the fluid due to the temperature change.

With the high precision flow rate display function of the electronic instrument error compensator, it is necessary to correct the change in the instrument error caused by the temperature of the measured fluid. In addition, the correct flow rate is displayed by correcting an error that changes with the change of the volume in the weighing chamber due to the expansion coefficient of the constituent material of the flow meter.

A volumetric flowmeter having excellent performance as a metering function of an electrically insulating fluid has a mechanical structure. Since the performance decreases due to the elapse of the use time and the wear of the rotating body having the weighing function, it is important that the shape of the rotating body be excellent in durability. Weighing accuracy is maintained by accurately maintaining this durability and the position of the rotor in the weighing chamber. By combining the function of the electronic instrument error device, it is possible to further increase the performance of the volumetric flowmeter. That is, since the precision of the volumetric flowmeter does not change with the passage of the use time, and high accuracy is ensured, all the causes of the error which are mutually correlated with temperature can be corrected, so that high precision can be compensated. However, since the instrument error characteristic of the main body of the flow meter changes with temperature, it is necessary to correct the error. In addition, it is important to maintain the gap between the rotating body and the metering chamber accurately, so that the rotating body rotates at the center position.

The problem of the present invention is corrected by removing the change in viscosity, volume expansion, and instrument error of the meter base body between the flow rate indicated by the rotational movement of the metering element of the flow meter and the actual flow rate. The purpose is to provide a method and apparatus for calibrating instrument errors in volumetric flowmeters for the purpose of giving accurate weighing indications.

The error factor that measures the flow rate of the measured fluid by the function of the rotating body having the weighing function of the volumetric flow meter,

Factors that fluctuate flow rate:

1. changes in the temperature range, volume expansion and contraction of the measured fluid;

2. Changes in the temperature zone of the fluid to be measured and leakage inside the metering chamber;

3. Changes in volume due to temperature ranges in the weighing chambers, as well as temperature changes in the weighing chambers;

4. Rotation speed of rotor, inherent error of flow meter body; And

5. The change of rotational resistance by the rotational speed of the rotor and the rotational speed of the rotor.

By operating the ROM in which the data of each item is inputted by mounting, inserting or switching, the variation factor for each liquid type is corrected.

In order to accurately display the flow rate, the volume expansion due to the change of the measured fluid and the influence of the instrument error due to the correlation between temperature and viscosity are eliminated, and the gap between the rotating bodies of the base body and the gap between the inner surface of the weighing chamber is eliminated. By correcting the amount of leakage from the device, the flow rate can be accurately displayed by correcting the error in the capacity display following the change in temperature and the error inherent in the instrument.

Since the state of the flow of the measured fluid of the process in the plant does not correlate directly with these factors in relation to temperature, in order to grasp these changes in real time and obtain a conversion measurement, Instantaneous precision measurement provides a high resolution correction value. Since an electronic correction device with high resolution gives an extremely accurate correction value, it is important to combine it with a flow meter body with stable metering function. This method allows accurate measurement of the error and can be corrected.

The curve (B) indicating the rotational speed of the instrument error band and the rotating body measured with respect to the theoretical line A as shown in Fig. 1 shows a constant relationship. The amount displayed by the rotation of the rotating body is corrected to zero the increasing instrument error E in the low speed rotation area of the rotor and the high speed rotation area, thereby displaying the correct flow rate. Next, even if the shape is the same, the viscosity and specific gravity of the fluid change due to slight temperature changes. Therefore, the flow rate displayed and calculated by the rotational speed of the rotating body needs to add a correction value.

The line A in Fig. 2 shows the relationship between the flow rate of the instrument error range, and the curve C and the curve D are flow rate curves for the instrument error indicating the actual value. The curve of (D) shows the case of high temperature rather than the curve of (C). In the results of the experiment, the deviation between the temperature changes of the peaks X1 and X2 of the curves (C) and (D) and the low-speed rotation zones Y1 and Y2, and the high-speed rotation zones Z1 and Z2 are not proportional to each other. Indicates. In addition, instrument error ranges and flow curves according to the type of liquid in the measurement fluid have a specific shape, and values increase in low viscosity fluids. When the measurement reference temperature is set to 20 ° C, the curve (C) or curve (D) is corrected by the condition correction value to remove the influence of the viscosity, resulting in the instrument error range and the flow curve (B) at 20 ° C. .

As a result, the error is eliminated by the correction method shown in FIG. 1, the theoretical curve A is displayed, and the correct flow rate is displayed. According to the metering error and characteristic curve determined by the shape of the system main body, the corrected flow rate is obtained by using the metering error value corresponding to the flow rate, that is, the rotational speed of the rotor.

3 shows a QE curve as shown in the figure because of the large amount of internal leakage in the case of a fluid of low viscosity and a large gap between the rotors of the flowmeter.

4 shows a QE curve as shown in the figure because the amount of internal leakage is large when the interval between the rotors and the gap of the rotors of the flowmeter are wide. The instrument error is small, but there is a danger of stopping other solid foreign matter in the gap.

In order for the rotor to rotate, a gap is required, and the instrument error curve is curved, but free rotation of the rotor is given. And weighing function is given.

The rotating body is supported by a shorter shaft that is gradually tapered with respect to the axis diameter of the cross section, and maintains the same clearance gap between the rotating bodies so that the rotating bodies can be rotated about the center of the shaft. In order to solve the above problems, the metering function is maintained at a constant condition during the rotation of the rotating body so as to display an accurate flow rate. However, if this flow curve is stable without change after a long time of operation, accurate flow rate display is possible with an electronic correction device.

For instrument error-flow curves that are ideal values, there is a relationship between the rotational speed of the rotor, the instrument error, and the temperature change instrument error, and these are expressed as errors, and corrections are made using a specific ratio. Display the correct value.

In this way, it can be used for ultra-precision measurement of industrial flow rate and industrial management, especially in the field of fine chemical industry, and by adding an electronic correction mechanism to the volumetric flowmeter, extremely high accuracy of ± 0.1% or less can be obtained.

According to the present invention, since the error correction value of the volume change, the viscosity change of the fluid, and the characteristic change of the characteristic characteristic of the instrument, which are the error factors of the volumetric flowmeter, are obtained in real time, the resolution from the viscosity measurement by the temperature sensor with high measurement accuracy is obtained. Correction is performed by converting into a reference value using the correction value obtained by this high means, and in particular, changes in the viscosity of the fluid according to the micro temperature change, the specific gravity change, and the intrinsic instrument error change due to the temperature change of the base body during the process. Structure that exhibits stable metering function by using the electronic correction device equipped with ROM that inputs each data to display the correct flow rate and the rotor of the twin rotor type flowmeter without resistance. By mounting the system base body with the electronic correction device, an ultra high precision weighing function can be obtained.

Electronic central control unit that measures the period of the pulse indicating the flow rate sent for each rotation of the rotating body, and reads and converts the pulse 1 pulse indicating the flow rate for the period from data stored in ROM and correction flow rate in advance. Use A rotation sensor for outputting a pulse signal representing the flow rate for each revolution of the rotor, a temperature sensor for measuring the temperature of the fluid, and an electronic central control device are provided. The period of the flow rate pulse signal is measured, and the temperature correction coefficient is read in real time from the specific gravity for each temperature previously stored in the ROM and the temperature correction data shown, and the flow rate for each pulse is corrected.

Further, a correction value is obtained from the correction coefficient data indicating the viscosity for each temperature previously stored in the ROM, using a correction coefficient obtained from the correlation of the viscosity-gap error with temperature, Correction is made by adding these correction values.

1 is an explanatory diagram showing an instrument error curve of a volumetric flow meter;

2 is an explanatory diagram showing an instrument error curve of a volumetric flow meter;

3 is an explanatory diagram showing an instrument error curve of a volumetric flow meter;

4 is an explanatory diagram showing an instrument error curve of a volumetric flow meter;

5 is an explanatory diagram showing a configuration of an electronic central control device for instrument error correction and flow rate indication;

6 is an explanatory diagram showing a configuration of an electronic central control device for instrument error correction and flow rate indication;

7 is a circuit diagram of a control device incorporating an electronic computing device for correcting instrument error for removing instrument inherent errors of the present invention;

Fig. 8 is a circuit diagram of a control device incorporating an electronic computing device for compensating instrument error for removing instrument specific errors of the present invention.

9 is an accessory electronic control device having a built-in instrument error correction for removing instrument inherent errors connected to a control device that has a built-in electronic operation mechanism for correcting an instrument error correction mounted on a flowmeter and a correction function of an internal leak design instrument error. It is explanatory drawing which shows a structure.

<Description of the reference numerals for the main parts of the drawings>

1 flow meter

2 temperature sensor

3 lead wire

4. Magnetic sensor

5, 6 lead wire

7 Viscosity Sensor

8,9 conductor

100 electronic central control unit

101,102,103 A / D Converter

104,106 Drivers

107 clocks

108,109 interface

111 ROM I

112 CPU I

113 RAM II

114 ROM II

115 CPU II

116 RAM III

117 ROM III

118 CPU III

120 indicator

5 is an explanatory diagram of a conventional electronic instrument error correction apparatus. The signal of the temperature sensor 2 installed in the dual rotor type flowmeter 1 or in a continuous pipe is routed to the electronic central controller 100 via the A / D converter 101. Continues. The magnetic sensor 4 which transmits the rotation of the rotor is continued by the conductor 5 to the electronic central control device 100 via the A / D converter 102. The signal of the viscosity sensing device 7 is continued to the electronic central controller 100 via the conductor 8 via the A / D converter 103. The signal transmitted from the computing device in the control device 100 passes through the lead 9 to operate the indicator 120.

FIG. 6 is a control unit CPU (I) of an electronic correction function for correcting a change in instrument error of a temperature-to-measured fluid shown in FIG. 5, and a previously prepared electronic correction for correcting instrument error of a temperature-to-measured fluid of another fluid. It is explanatory drawing of the internal electric circuit of the electronic central control unit which provided the function control unit CPU (II) in parallel, and the apparatus connected.

The pulse signal from the rotation sensor 7 which transmits the rotation of the rotating body of the flowmeter is input to the input interface 108 and to the terminal of the electronic controller CPU (I) 112.

The electronic controller CPU (I) 112 incorporating the ROM (I) function for correcting the temperature-to-volume expansion and contraction change checks the input / output interfaces 108 and 109 for input of this signal. Check and proceed to integration. According to the time between the pulse input and the previous pulse input, that is, the pulse interval, the flow rate of the pulse 1 pulse is read from the correction data of the instrument error stored in the ROM (I) 111 in advance, and the A / D converter The electrical signal converted into the flow rate at the reference temperature obtained by converting the temperature obtained by converting the digital value into the digital value by the ROM (I) 111 by the volume-weighted data by the ROM (I) 111 is again inputted to the input / output interface 109. At the same time as the input to the CPU (II) (115). With the read temperature signal transmitted from the bypass of the temperature sensor, a condition correction value obtained from the correlation of the internal leakage amount of the temperature-viscosity change pre-written in the ROM (II) 114 is corrected at the reference temperature. Converted to the flow rate, the converted flow rate or the instantaneous flow rate is displayed on the display unit 120, or the counter 105 is operated.

The temperature obtained by converting the specific resistance of the temperature sensor 2 installed in the flowmeter 1 into a digital value by the analog-digital converter 101 is read. From the temperature-specific data stored in advance in the ROM (II) 111, the flow rate per pulse is converted into a flow rate in a state of a reference temperature, for example, 20 ° C. The converted flow rate is fed back to the input and output interface (108, 109). Next, the flow rate per pulse 1 pulse from the rotation sensor 7 is read from the instrument error correction data stored in the ROM (II) 114, and the signal of the temperature sensor 2 installed inside the flowmeter is digitally read. The correction value is obtained from the instrument error correction data due to the temperature-viscosity change obtained by conversion to the value, and the flow rate is converted into the flow rate of the reference temperature. Next, the integrated flow rate or the instantaneous flow rate is displayed on the display 120 through the driver 104 or the counter 105 is operated. 7 indicates a sensor for continuous viscosity measurement, and can be used for a wide range of liquids by independence or alteration with a temperature sensor. However, since the viscosity cannot be accurately displayed, it is used as a reference data.

The accuracy of 0.05% of the corrected accuracy means an error within 1/2000 of the displayed flow rate, and it has no structure of wear deformation of the rotating parts such as the rotor, bearing, and thrust ring which measure the volumetric flowmeter of the mechanical structure. It is important to do. For example, if the teeth of the rotating body of the non-circular gear flowmeter are formed so as not to cause deformation of the interlocking tooth surface without closing, it is possible to exert a precise flow rate correction effect by mounting the electronic control device.

In addition, since the flowmeter body has a mechanical structure, it is preferable that the operating conditions are not severe, and it is important to have a low rotational speed of the rotating body in the measurement flow rate range and a low rotational speed in the small flow rate. In other words, the lightweight rotor having a large discharge rate (ratio of discharge amount per revolution to rotational capacity) satisfies this requirement. As there is a characteristic that the instrument error increases in the low speed rotation area, a means for correcting the characteristic error unique to the instrument is effective.

Next, using the electronic correction mechanism, the flow rate is converted to the correct flow rate at the reference temperature, and the instrument error is corrected and displayed. However, it is important that deformation due to mechanical abrasion of the rotor and the bearing serving as the metering body of the system basic body does not occur. Since deformation of these rotating elements changes the value of the clearance gap of a flowmeter main body, a meter error curve changes and a meter error correction conversion value must be corrected. Therefore, the rotor uses a saw tooth type such that no closing of cycloid tooth type occurs. Accordingly, the gear is excellent in durability since it does not generate frictional scratches. In addition, the rotor resistance is small and the metering function is excellent.

Non-circular gear type flowmeters have high volumetric efficiency and therefore have high weighing accuracy. The larger the flatness of the rotating body is, the larger the discharge rate is, and the instrument error characteristic is improved and the size of the system base body is smaller. However, since the pair of gear rotors of gear engagement rotate while repeating acceleration and deceleration with each other, vibration and noise increase with high speed rotation, and the braking force by the rotating body becomes large, resulting in a large flow area leakage. .

Figure 7 shows a circuit of the electronic instrument error correction apparatus with the function of eliminating the instrument-specific error of the present invention. A control device for inputting a separate clock signal by inputting a signal from the sensor for correcting an error in a characteristic curve with respect to an ideal QE curve between a temperature sensor, a flowmeter equipped with a rotation sensor and an controller. In the assembled circuit, the electronic central controller 100 described with reference to FIG. 6 corrects the instrument error due to the volume change of the fluid and the correlation between the temperature and the viscosity, and at the same time eliminates the instrument error in the micro flow region. The electric circuit diagram which reads and corrects the data which correct | amends the error of the instrument specific characteristic with respect to the above QE curve memorize | stored in ROM (III) 117 which inputted the data of the function to perform.

The magnetic sensor 4 which transmits the rotation of the rotating body of the meter 1, and the pulse signal from the temperature sensor 2 are input to the input interface 108, and the electronic control unit CPU (III) 118 is connected to this. The signal input confirms that there is a pulse input by checking the signal input from the input / output interface 108, and the flow rate per pulse is determined by the time interval between the pulse input and the previous pulse input. Reading from the rotational speed of the rotating body and the calibration data of the instrument characteristic instrument error, and correcting the error inherent in the instrument error in each flow region, and then to the control device 100 described with reference to FIG. The flow rate correcting the meter error due to the temperature change of the fluid is displayed on the display 120.

FIG. 8 shows ROM (I) 111 and ROM () for correcting values of volume change of fluid caused by electric temperature change measured by the volumetric flow meter of the present invention, and instrument error change of internal leakage caused by viscosity change. II) An electric circuit diagram of an electronic control apparatus incorporating the circuit (ROM) (III) 117 into which the data of the function for correcting the characteristic characteristic error is corrected by the flowmeter and the flowmeter is combined with the circuit. It is an explanatory view of the electronic correction apparatus of the embodiment using a means for correcting the three components of the temperature range specific gravity, temperature range viscosity, and temperature range instrument characteristic error of the present invention, which has a function of displaying and transmitting the instrument error correction value.

The function of the electronic central control unit installed in the volumetric flowmeter installed in advance is an instrument error correction function based on the correlation of the volume expansion and contraction of the fluid with the temperature as described above, and the accumulated flow rate of the fluid calculated by the pulse of the magnetic sensor. Flow rate display function, which is an instantaneous flow rate display function and corrects an error caused by a multi-function instrument error correction operation of the present invention, is a pre-installed electronic correction control device, for example, a flow chamber internal leakage correction and an instrument unique error The electronic correction control device having functions such as correction and correction of volume change based on the temperature coefficient of expansion of the material of the flowmeter main body is connected to the electronic central controller as an attached electronic control device, so that the pulse of the magnetic sensor of the flowmeter , Electronic central control by inputting the signal from the electronic central control device to the attached electronic control device The value of the function accurate flow has met characterized in that displayed on the display.

9 is connected from the temperature sensor 2 embedded in the Root Meter 1 of the volumetric flow meter of FIG. 9 to the electronic central controller 100 pre-installed on the conductive wire 13, and from the magnet 4 to the conductive wire 12. A signal is input by connecting to the central control apparatus 100. The wire pre-installed from the device inputs a signal to the indicator 120. The attached electronic controller 105 is connected by a laying conductor 11 branching off from a pre-installed conductor and corrects an error inherent in the instrument and / or internally corrects an electronic correction device having an internal leakage instrument error correction function. The flow rate is displayed by inputting a signal indicating the flow rate to be calculated and corrected by the accessory control device 105 to the indicator connected to the plurality of new conductive wires 10.

The attached electronic control device attached to the microcomputer installed in advance has the function of the microcomputer which corrects the internal leakage of a volumetric flowmeter as follows.

The following describes the symbol description of each element.

Measuring range ratio (Fr) = (maximum flow rate-minimum flow rate) ÷ minimum flow rate = XB

Internal leakage instrument error correction factor (E) = -0.0A% / ℃

Pre-installed flow meter display flow rate (Q) = RPM X Vs

Internal Leakage Instrument Error Correction Flow Rate (E rev)

Temperature (Tr) = T ℃-15 ℃

Rotor Rotation Speed (rpm)

Discharge amount per rotation of the flowmeter (Vs) = litter / rev., Cub.m / rev

Actual temperature (T) = T ℃

Error Correction Factor (Rr) = 100% + 0.0A% / ℃ × Tr ℃

Operating Temperature Range = -20 ℃ ~ + 60 ℃

Maximum temperature error (Emax) = -0.0A% / ℃ × 45 ℃

Minimum temperature error (Emin) = -0.0A% / ℃ × (-35 ℃)

= 0.0A% / ° C × 35 ° C

Internal Leakage Instrument Error Correction Flow Rate (Erev) = Q × (1 + 0.0A% / ℃ × Tr ℃)

The high-precision volumetric flowmeter is equipped with a microcomputer having a function of calculating a flow rate by rotation of a rotating body having a weighing function and correcting it in response to factors such as measured fluid temperature and viscosity.

The calibration function of the pre-installed microcomputer is the fluid temperature vs. Correction is made by a function (temperature x expansion coefficient) based on the correlation between volume expansion and contraction. The internal leakage compensation is corrected by multiplying the internal leakage measurement error correction coefficient E by the flow rate indicated by the microcomputer installed in advance.

The following shows the relationship between the measurement range ratio, instrument error correction coefficient, maximum temperature and minimum temperature difference of the attached microcomputer.

Microcomputer number Measurement range ratio (B) Instrument error correction factor (E) Maximum temperature error (Emax) SOZ10 X15 -0.01% / ℃ -0.45% SOZ20 X10 -0.02% / ℃ -0.90% SOZ30 X6 -0.03% / ℃ -1.35% SOZ40 X3 -0.04% / ℃ -1.80% SOZ50 X2 -0.06% / ℃ -2.70% Microcomputer number Measurement range ratio (B) Instrument error correction factor (E) Lowest Temperature Error (Emax) SOZ10 X15 -0.01% / ℃ + 0.35% SOZ20 X10 -0.02% / ℃ + 0.70% SOZ30 X6 -0.03% / ℃ + 1.05% SOZ40 X3 -0.04% / ℃ + 1.40% SOZ50 X2 -0.06% / ℃ + 2.70%

Multiply the internal leakage correction coefficient by the flow rate (Q) (output) indicating the meter error correction coefficient -0.02% / ℃ at the maximum temperature of 60 ℃,

Q × (100%-0.02% / ℃ × 45 ℃) = Q × 100.9%

Maximum temperature correction (Emax) = 0.9%. This is in the range of correction accuracy of the form recording method: -0.02%. The microcomputer SOZ of each number is connected to the flowmeter of a measurement range ratio (B).

The output pulse of the display flow rate of a flowmeter and the pulse of a temperature sensor are input into microcomputer SOZ. The microcomputer SOZ is a CPU incorporating a ROM that inputs a function of the correlation between the temperature range corresponding to the measurement range ratio and the internal leakage correction coefficient E. The microcomputer SOZ has a volume flow rate, an instantaneous flow rate, and a temperature range of a pre-installed microcomputer. It is an inexpensive accessory that has the function of adding the instrument leakage correction to the internal leakage of the temperature zone by the calculation function of volume expansion and shrinkage correction.

Although the manufacturing cost of the microcomputer of each method corresponding to the structure, the size of the flowmeter body, the type of liquid to be measured, and the viscosity is high, the present invention is expensive for internal leakage measurement of a microcomputer mounted on a pre-installed flowmeter. The attached microcomputer correcting this insufficient function has a feature of adding a new performance improvement effect without changing the function of the microcomputer of a pre-installed flow meter.

The present invention provides a reliable and accurate measurement of the flow rate of a volumetric flowmeter, thereby real-time rotation of instrument specific measurement errors based on the specific gravity of the fluid, the viscosity, and the characteristics of the flowmeter body in response to changes in the measured fluid temperature. Electronic correction that displays and converts the flow rate as a calculated value calculated by speed has the effect of performing super-precision measurement function over a wide range of flow rates and even slight temperature changes, and is related to such slight temperature environment changes. It is characterized in that the control unit is equipped with a calculation device that catches and corrects small changes caused by temperature change of the measurement error inherent in the measuring instrument. The stable function of the rotating element makes it possible to make measurements without errors.

In the case of leakage inside the measuring room, the amount of the result which is affected by the change of the volume in the weighing chamber due to the temperature change of the flow meter main body is actually measured, but the amount of the internal leakage is larger than that shown, and the coefficient is calculated by the actual displaying amount. do.

Claims (4)

The rotation of the rotating body which forms the volumetric flowmeter's metering function is a correction in which an error of the flow rate calculated by calculating the flow rate in terms of a conversion value is given a correlation between the specific gravity of the measured fluid as a function of temperature and the instrument error. In order to output and display the flow rate corrected by the value, and to correct the error, a method and device for connecting a temperature sensor installed in the flow path to the electronic computing device with a conductor, and an electric signal indicating the temperature change is input to the extension device. A method and device for inputting a signal of a temperature sensor to an electronic controller equipped with a ROM that inputs a signal for correcting a volume of a measured fluid that changes in response to a temperature change. A volumetric flowmeter for continuously connecting a method of measuring a period of time, and a method and a device for calculating a flow rate from this pulse, the signal of a temperature sensor Correct the error by inputting a pulse sent from a temperature sensor mounted in the weighing chamber, inside the pipe, etc. to a control device equipped with a ROM that inputs a function to correct the error of the amount of fluid flowing. The instrument error correction method and apparatus for volumetric flowmeters, which are corrected by a signal that is corrected by a value calculated by using the expansion coefficient of the fluid in the flow rate calculated by the control device that inputs the pulse generated from the magnetic sensor. And an instrument error correction method for a volumetric flowmeter, wherein the displayed signal is corrected by the correction value. 2. The electronic pulse controller of claim 1, wherein the output pulses of the electronic central controller and temperature sensor mounted on the flowmeter and the pulses indicating the flow rate output from the electronic calculator by the rotational speed of the rotor are connected to the electronic calculator by a conductor. And a means for calculating the correction value as a function of the correlation of the function of correcting the instrument error in the weighing chamber by connecting the conductor of the temperature sensor installed in the flow path to this electronic computing device. Error correction method and apparatus. 2. An electronic control apparatus according to claim 1, wherein an electronic central control unit mounted on the flowmeter is joined with an accessory electronic control unit using a means for removing and correcting measurement errors inherent in the microfluidic region and / or the large flow region based on the characteristics of the flowmeter. Instrument error correction method and apparatus for a volumetric flow meter. The accessory electronic control according to any one of claims 1 to 3, wherein the electronic central control unit mounted on the flowmeter and the means for removing and correcting a measurement error inherent in the instrument due to thermal expansion and contraction of the material constituting the flowmeter. Instrument error correction method and apparatus for a volumetric flow meter, characterized in that the device is bonded.