JP2012127750A - Meter system and flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a cumulative flow rate at a flow meter side when a fluid to be measured flows backward and to notify a user of correction.SOLUTION: A flowmeter 1 constituting a meter system comprises: a storage section 63 to store a cumulative flow rate calculated by a flow rate calculation section 62 when a rotation direction determination section 61 determines that a flow direction of a fluid to be measured changes from a forward flow to a backward flow; a pulse signal output section 66 which outputs a pulse signal when the cumulative flow rate calculated by the flow rate calculation section 62 is equal to or larger than the cumulative flow rate stored in the storage section 63; a display control section 67 which, when the pulse signal output section 66 stops an output of the pulse signal, displays to that effect on a display section 7. A counter 2 calculates the cumulative flow rate of the fluid to be measured based on the pulse signal output by the pulse signal output section 66 and displays the cumulative flow rate.

Description

  The present invention relates to a meter system for measuring a flow rate of a fluid to be measured such as a water meter, a gas meter, or a power meter, and a flow meter thereof.

  Conventionally, flow meters such as electronic gas meters, water meters, and power meters have permanent magnets and resonance coils attached to the rotor shaft and shafts that have been transmitted by a gear, etc., and the rotation is detected by a magnetic sensor. A metering pulse is generated, and the amount of fluid used is calculated based on the metering pulse. A counter having a display function is connected to the flow meter via a wired or wireless communication line. When the counter receives a pulse signal, the counter displays an integrated value of the amount used according to the number of pulses. In such a system, an error occurs between the integrated flow rate of the fluid displayed on the flow meter side and the integrated flow rate value on the counter side.

  As a countermeasure, in the meter system disclosed in Patent Document 1, a forward pulse signal is supplied to the counter when the fluid flows in the forward direction, and a reverse pulse signal is supplied when the fluid flows in the reverse direction. In the counter, when the forward rotation pulse signal is supplied, the flow rate integrated value is added, and when the reverse rotation pulse signal is supplied, the flow rate integrated value is subtracted. Thereby, the integrated flow rate of the fluid displayed on the flow meter side is matched with the integrated flow rate value on the counter side.

JP 2002-221439 A

  In the conventional meter system, since the forward rotation pulse signal and the reverse rotation pulse signal are output from the flow meter side, it is necessary to judge whether the pulse signal is forward or reverse on the counter side and to perform addition processing or subtraction processing of the integrated flow rate value. there were. Furthermore, there is a problem that when the reverse pulse signal cannot be output to the counter side due to a malfunction of the flow meter, the counter side is mistaken for a failure.

  The present invention has been made to solve the above-described problems. Even when a back flow of the fluid to be measured occurs, the accurate integrated flow rate value is not obtained on the counter side without performing subtraction processing on the integrated flow rate value. And a meter system that notifies the user that the integrated flow rate is being corrected on the flow meter side.

  According to a first aspect of the present invention, there is provided a meter system that outputs a detection signal corresponding to the flow rate of the fluid to be measured, and a direction for determining the flow direction of the fluid to be measured based on the detection signal output from the detection portion. Based on the determination unit, the detection signal output from the detection unit and the determination result of the direction determination unit, the flow rate calculation unit that performs addition / subtraction processing to calculate the integrated flow rate of the fluid to be measured, and the flow of the fluid to be measured in the direction determination unit A memory unit that stores the integrated flow rate calculated by the flow rate calculation unit when the direction changes from a forward flow that flows in a preset direction to a reverse flow that flows in the direction opposite to the forward flow direction, and an integration value that is calculated by the flow rate calculation unit Outputs a pulse signal when the flow rate is greater than or equal to the integrated flow rate stored in the memory unit, and outputs a pulse signal when the integrated flow rate calculated by the flow rate calculation unit is less than the integrated flow rate stored in the memory unit. stop A pulse signal output unit that performs the display control of the integrated flow rate calculated by the flow rate calculation unit and the display control unit that performs display control indicating the stop when the pulse signal output unit stops outputting the pulse signal, Based on the display control of the display control unit, a flow meter provided with a display unit for displaying the integrated flow rate and displaying the stop of the pulse signal, and the flow rate integration of the fluid to be measured based on the pulse signal output from the pulse signal output unit And a counter for calculating and displaying the value.

  According to a second aspect of the present invention, the meter system includes a rotor that rotates according to the flow rate of the fluid to be measured, and the direction determination unit determines the flow direction of the fluid to be measured based on the rotation direction of the rotor.

  According to a third aspect of the present invention, the meter system includes a display control unit that displays the pulse signal output stop time of the pulse signal output unit on the display unit.

  According to a fourth aspect of the present invention, a meter system includes a display control unit that displays a reverse flow rate of the fluid to be measured on the display unit.

  A meter system according to a fifth aspect of the present invention includes a display control unit that displays a difference between the integrated flow rate of the display unit and the integrated flow rate stored in the memory unit on the display unit.

  According to a sixth aspect of the present invention, there is provided a flowmeter for detecting a flow direction of the fluid to be measured based on a detection unit that outputs a detection signal corresponding to the flow rate of the fluid to be measured, and a detection signal output from the detection unit. Based on the determination unit, the detection signal output from the detection unit and the determination result of the direction determination unit, the flow rate calculation unit that performs addition / subtraction processing to calculate the integrated flow rate of the fluid to be measured, and the flow of the fluid to be measured in the direction determination unit A memory unit that stores the integrated flow rate calculated by the flow rate calculation unit when the direction changes from a forward flow that flows in a preset direction to a reverse flow that flows in the direction opposite to the forward flow direction, and an integration value that is calculated by the flow rate calculation unit Outputs a pulse signal when the flow rate is greater than or equal to the integrated flow rate stored in the memory unit, and outputs a pulse signal when the integrated flow rate calculated by the flow rate calculation unit is less than the integrated flow rate stored in the memory unit. Pause to stop A display signal output unit, a display control unit that performs display control to indicate the stop when the pulse signal output unit stops the output of the pulse signal, and the display control of the integrated flow rate calculated by the flow rate calculation unit, and the display A flow meter comprising: a display unit that performs display of integrated flow rate and display of pulse signal stop based on display control of the control unit.

  According to the present invention, when the pulse signal output unit stops the output of the pulse signal, the display unit displays the stop, so the integrated flow rate displayed on the flow meter and the counter It is possible to notify the user of the factor that the displayed flow rate integrated value is different. This eliminates the need for the user to reset the device or determine a failure, and can efficiently measure the amount of fluid to be measured.

  In addition, according to the present invention, since the time during which the output of the pulse signal is stopped is displayed on the display unit, the output stop state of the pulse signal can be specifically grasped.

  Further, according to the present invention, since the reverse flow rate of the fluid to be measured is displayed on the display unit, it is possible to specifically grasp the output stop status of the pulse signal.

  In addition, according to the present invention, since the difference between the integrated flow rate of the display unit and the integrated flow rate stored in the memory unit is displayed on the display unit, it is possible to specifically grasp the output stop status of the pulse signal. Can do.

It is a figure which shows the structure of the meter system by Embodiment 1. FIG. 3 is a flowchart showing the operation of the meter system according to the first embodiment. 2 is an example showing the operation of the meter system according to the first embodiment. It is a figure which shows the example of a display of the flowmeter in the meter system of FIG. It is a figure which shows the other example of a display of the meter system by Embodiment 1. FIG.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a meter system according to the first embodiment. The meter system shown in FIG. 1 is connected to a flow meter 1 that can output a pulse signal composed of, for example, an electronic water meter, and the flow meter 1 via a pulse signal line or a communication line from the meter. Counter 2.
The flow meter 1 includes a rotor 3, a permanent magnet 4, a detection unit 5, a control unit 6, and a display unit 7. The permanent magnet 4 rotates in conjunction with the rotor 3 that rotates according to the amount of fluid to be measured, and the magnetic field changes due to the rotation of the permanent magnet 4. The magnetic sensor 51 of the detection unit 5 detects a change in the magnetic field, and a detection circuit 52 performs amplification and wavelength formation to generate a detection signal.

The control unit 6 includes a rotation direction determination unit 61, a flow rate calculation unit 62, a memory unit 63, a display control unit 64, and a pulse signal output unit 65.
Based on the detection signal obtained from the detection unit 5, the rotation direction determination unit 61 determines whether the rotation direction of the rotor 3 is normal or reverse with respect to a preset rotation direction. The flow rate calculation unit 62 performs signal processing of the detection signal obtained from the detection unit 5, performs addition / subtraction processing of the fluid to be measured based on the forward / reverse rotation determination determined by the rotation direction determination unit 61, and calculates the flow rate of the fluid to be measured. calculate. The memory unit 63 stores the integrated flow rate of the fluid to be measured calculated by the flow rate calculation unit 62 when the determination result of the rotation direction determination unit 61 shifts from normal rotation to reverse rotation.

  The display control unit 64 displays the flow rate of the measured fluid calculated by the flow rate calculation unit 62 on the display unit 7. The pulse signal output unit 65 outputs a pulse signal to the counter 2 based on the flow rate of the fluid to be measured calculated by the flow rate calculation unit 62. Further, the pulse signal output unit 65 refers to the integrated flow rate calculated by the flow rate calculation unit 62 and the integrated flow rate stored in the memory unit 63, and the integrated flow rate calculated by the flow rate calculation unit 62 is stored in the memory unit 63. A pulse signal is output to the counter 2 when the accumulated flow rate is greater than or equal to. Accordingly, the display control unit 64 refers to the pulse signal output state of the pulse signal output unit 65. When the output of the pulse signal is stopped, the display control unit 64 stops the output of the pulse signal on the display unit 7 and the flow rate. The fact that the total flow rate is being corrected is displayed on the total 1 side. Further, the display control unit 64 may be configured to refer to the determination result of the rotation direction determination unit 61 and to perform display indicating the reverse rotation when the rotor 3 is reversely rotated.

The counter 2 includes a pulse input unit 21, an integration unit 22, and a display unit 23.
The pulse input unit 21 receives an input of a pulse signal supplied from the pulse signal output unit 65 of the control unit 6. The integrating unit 22 performs a process of adding the flow rate integrated value of the fluid to be measured based on the pulse signal input via the pulse input unit 21. The display unit 23 displays the flow rate integrated value of the fluid to be measured added by the integrating unit 22.

  Thus, when the integrated flow rate displayed on the display unit 7 is less than the integrated flow rate stored in the memory unit 63 and the output of the pulse signal to the counter 2 is stopped, the display unit 23 of the counter 2 is stopped. Stops at the counter value at the time when the reverse rotation of the rotor 3 occurs. The cause of the difference between the counter value of the display unit 23 of the counter 2 and the integrated flow rate of the display unit 7 of the flow meter 1 is the reverse of the rotation direction of the rotor 3, that is, the flow path of the fluid to be measured (not shown). ), The display unit 7 displays that the integrated flow rate is being corrected.

Next, the operation of the meter system according to Embodiment 1 will be described. FIG. 2 is a flowchart showing the operation of the meter system according to the first embodiment, and shows the operation of the control unit 6 when a detection signal is input from the detection unit 5.
When the detection signal is input from the detection unit 5 (step ST1), the control unit 6 determines whether the rotation direction of the rotor 3 is normal based on the detection signal obtained from the detection unit 5 by the rotation direction determination unit 61. Or whether it is reverse rotation (step ST2). Further, the flow rate calculation unit 62 performs signal processing of the detection signal, and performs addition processing when the rotation direction of the rotor 3 is normal rotation in step ST2 and subtraction processing when the rotation direction of the rotor 3 is reverse rotation. The integrated flow rate of the fluid to be measured is calculated and output to the display unit 7 via the display control unit 64 (step ST3).

  Further, the flow rate calculation unit 62 calculates the determination result of the rotation direction determination unit 61 and determines whether the rotation direction of the rotor 3 is normal rotation or reverse rotation (step ST4). If the rotation direction of the rotor 3 is normal in step ST4, the process proceeds to step ST6. On the other hand, when the rotation direction of the rotor 3 is reverse in step ST4, the flow rate calculation unit 62 stores the integrated flow rate of the fluid to be measured in the memory unit 63 (step ST5).

  Next, the pulse signal output unit 65 determines whether or not the current integrated flow rate calculated by the flow rate calculation unit 62 is greater than or equal to the integrated flow rate stored in the memory unit 63 (step ST6). When it is determined in step ST6 that the current flow rate calculated by the flow rate calculation unit 62 is less than the integrated flow rate stored in the memory unit 63, the display control unit 64 corrects the integrated flow rate on the flow meter 1 side. Is displayed on the display unit 7 (step ST7). Thereafter, the flow returns to the process of step ST1.

  On the other hand, if it is determined in step ST6 that the current flow rate displayed on the display unit 7 is greater than or equal to the integrated flow rate stored in the memory unit 63, the pulse signal output unit 65 outputs a pulse signal to the counter 2. (Step ST8). Further, when the display control unit 64 performs control to display on the display unit 7 that the integrated flow rate is being corrected on the flow meter 1 side, the display unit 7 is instructed to cancel the display. (Step ST9). Thereafter, the flow returns to the process of step ST1, and the above-described process is repeated.

  Next, correction of the integrated flow rate on the flow meter 1 side will be described with reference to specific examples of FIGS. 3 and 4. FIG. 3 is an explanatory diagram showing correction of the flow rate when a backflow occurs in the meter system according to Embodiment 1, and FIG. 4 shows a display example on the display unit of the flow meter at that time. In the specific example of FIG. 3, one pulse is output per 10 L of fluid flow rate. That is, when the rotor 3 is rotating forward, when one pulse is output, the flow rate 10L is added in the integrating unit 22 of the counter 2.

  FIG. 3A shows a state where the rotor 3 is rotating forward and the fluid to be measured is flowing in a forward direction through a flow path (not shown). The current integrated flow rate is 340 L, and the pulse signal output unit 65 outputs a pulse signal to the counter 2. The example of a display of the display part 7 of the flowmeter 1 in Fig.3 (a) is shown to Fig.4 (a). Since the fluid to be measured flows in the forward direction in the flow path, and the accumulated flow rate is not corrected on the flow meter 1 side and a pulse signal is output on the counter 2 side, the accumulated flow rate 7a ( In this case, “340” is displayed) and only the pilot lamp 7b is displayed.

  FIG. 3B shows a case where a back flow of the fluid to be measured occurs when the integrated flow rate reaches 340L and the integrated flow rate is subtracted to 150L. When the rotation direction discriminating unit 61 discriminates the reverse rotation of the rotor 3, the integrated flow rate (here, 340 L) calculated by the flow rate calculating unit 62 is stored in the memory unit 63. Further, in the pulse signal output unit 65, the pulse signal is not output in a range where the current integrated flow rate of the flow rate calculation unit 62 is determined to be less than the integrated flow rate stored in the memory unit 63, and the display control unit 64 A mark indicating the integrated flow rate correction is displayed on the display unit 7.

  Alternatively, in the pulse signal output unit 65, the amount of reverse rotation (here, 190 L of the difference of 150 L after the reverse rotation from 340 L) is recorded in the memory unit 63. A method may be used in which the display control unit 64 displays a mark indicating the correction of the integrated flow rate on the display unit 7 without outputting the pulse signal until the normal rotation is performed by the same amount as that recorded in the memory unit 63.

  Alternatively, in the pulse signal output unit 65, the number of detection signals reversed is recorded in the memory unit 63. A method may be used in which the display control unit 64 displays a mark indicating the correction of the integrated flow rate on the display unit 7 without outputting the pulse signal until the normal rotation is made in the same number as the number of detection signals recorded in the memory unit 63.

  Further, the display control unit 64 may be configured to display a mark indicating the backflow of the fluid to be measured when the rotor 3 is reversed. The flow rate calculation unit 62 subtracts the integrated flow rate based on the detection signal input from the detection unit 5, and displays the value of the integrated flow rate 7a on the display unit 7 (for example, 150L).

  FIG. 4B shows a display example of the display unit 7 of the flow meter 1 in FIG. Since the fluid to be measured flows through the flow path in the reverse direction, and the correction of the integrated flow rate (subtraction of the integrated flow rate) is performed on the flow meter 1 side, the display unit 7 includes the integrated flow rate 7a, the pilot lamp 7b, and the integrated flow rate. A correction mark 7c and a backflow alarm 7d are displayed.

  In FIG. 3 (c), when the integrated flow rate is subtracted to 150L, the fluid to be measured flows in the forward direction in the flow path, and the flow rate exceeds "340L" when the rotor 3 is reversed. The case where the fluid flows in the forward direction is shown. The rotation direction discriminating unit 61 determines that the fluid is flowing in the forward direction, and the display control unit 64 cancels the display of the mark indicating the back flow of the fluid to be measured. Further, in the pulse signal output unit 65, in the range where the current integrated flow rate of the display unit 7 is determined to be less than the integrated flow rate stored in the memory unit 63 (here, the range of 150L to less than 340L), the output of the pulse signal is Without being performed, a pulse signal is output in a range (340 L or more) in which it is determined that the current integrated flow rate of the display unit 7 is less than the integrated flow rate stored in the memory unit 63. In the example of FIG. 3, since one pulse is output per 10 L of the fluid flow rate, a pulse signal of one pulse is output to the counter 2 when the integrated flow rate becomes 350 L.

FIG. 4C shows a display example of the display unit 7 of the flow meter 1 in FIG. 3C (range from the integrated flow rate 150L to less than 340L). In the range from the integrated flow rate 150L to less than 340L, the fluid to be measured flows in the forward direction, but until the integrated flow rate becomes 340 or higher, the correction of the integrated flow rate (the integrated flow rate stored in the memory unit 63 (340L )), The integrated flow rate 7a, the pilot lamp 7b, and the integrated flow rate correction mark 7c are displayed on the display unit 7.
On the other hand, when the integrated flow rate is 350L or more, the display of the integrated flow rate correction mark 7c is canceled and the display returns to the above-described display of FIG.

  Thus, when the fluid to be measured flows in the forward direction of the flow path, the pulse signal is supplied to the counter 2 and the count value of the display unit 23 is added. On the other hand, when a back flow of the fluid to be measured occurs, the integrated flow rate of the flow rate calculation unit 62 at that time is stored in the memory unit 63, and the integrated flow rate of the flow rate calculation unit 62 is stored in the memory unit 63. Until returning to, the output of the pulse signal is stopped and the addition of the count value of the display unit 23 of the counter 2 is stopped. Thereby, the integrated flow rate of the display unit 7 of the flow meter 1 and the count value of the display unit 23 of the counter 2 are different, but the values are different by displaying the integrated flow rate correction mark 7c and the backflow alarm 7d on the display unit 7. The user is notified of the cause of the failure.

  Next, FIG. 5 shows another display example of the display unit 7. FIG. 5A shows a display example when the integrated flow rate is corrected, and FIG. 5B shows a display example when the integrated flow rate is not corrected. In this display example, the presence / absence of correction is notified by changing the shape of the pilot lamp described above when the integrated flow rate is corrected (7c ') and when it is not corrected (7b). FIG. 5C shows a display example at the time of correcting the integrated flow rate, and shows a configuration in which the display of the backflow alarm is omitted and only the integrated flow rate correction mark 7c is displayed. FIG. 5D shows a different shape (7c ″) of the integrated flow rate correction mark at the time of integrated flow rate correction. FIG. 5 (e) substitutes a generally used pilot lamp (7b ') as an integrated flow rate correction mark by always turning on or off without flashing according to the flow rate when correcting the integrated flow rate. You can also As described above, the integrated flow rate correction mark can be appropriately changed as long as the display method allows the user to recognize the correction of the integrated flow rate.

  As described above, according to the first embodiment, the rotation direction determination unit 61 that determines the rotation direction of the rotor 3 and the addition / subtraction processing of the fluid to be measured based on the rotation direction of the rotor are performed. A flow rate calculation unit 62 that calculates the flow rate, a memory unit 63 that stores the value of the integrated flow rate when the rotation direction of the rotor 3 changes from normal rotation to reverse rotation, and the integrated flow rate calculated by the flow rate calculation unit 62 are stored in the memory. A pulse signal output unit 65 that outputs a pulse signal to the counter 2 side when the accumulated flow rate stored in the unit 63 is greater than or equal to the accumulated flow rate, and a predetermined mark when the pulse signal output unit 65 stops outputting the pulse signal. Since the display control unit 64 for display is provided, it is possible to make the user recognize the factor that the display values of the display unit 7 of the flow meter 1 and the display unit 23 of the counter 2 are different. As a result, even if the displayed values are different, it becomes clear that the pulse signal is not output to the counter 2 side by correcting the integrated flow rate on the flow meter 1 side, and the flow meter 1 or the counter 2 is faulty. And can be distinguished. Furthermore, it is not necessary to reset the flow meter 1 or the counter 2 or determine a failure, and the amount of fluid to be measured can be efficiently confirmed.

  Further, according to the first embodiment, the pulse signal is output to the counter 2 side only when the integrated flow rate of the flow rate calculation unit 62 is equal to or greater than the integrated flow rate stored in the memory unit 63. There is only one pulse signal output, and there is no need to determine forward rotation or reverse rotation. Further, even if the pulse signal cannot be output to the counter 2 side for some reason during the back flow of the fluid to be measured, it is not necessary to correct the counter value. As a result, the use of the flow meter 1 or the meter system becomes more efficient.

In the first embodiment described above, the configuration is shown in which the integrated flow rate 7a, the pilot lamp 7b, the integrated flow rate correction mark 7c, and the backflow alarm 7d are displayed on the display unit 7, but the display items on the display unit 7 are added or changed. May be. For example, the time during which the integrated flow rate was corrected, that is, the time during which the pulse signal output was stopped, the reverse flow rate of the fluid to be measured, the integrated flow rate stored in the memory unit 63 and the integrated flow rate displayed on the display unit 7 One or more of the differences are combined and displayed. In addition, the contents other than those described above can be displayed as long as the contents correct the integrated flow rate correction status.
Thereby, the user can grasp | ascertain the condition where the backflow of the fluid to be measured occurred concretely, and specifically, the factor that the value of the display unit 7 of the flow meter 1 and the value of the display unit 23 of the counter 2 do not coincide with each other. Can be confirmed. Thereby, it is possible to efficiently determine the necessity of installing a backflow prevention valve in the flow path and whether or not the flow meter 1 or the counter 2 is out of order.

In the first embodiment described above, the rotation direction determination unit 61 determines the rotation direction of the rotor 3, and whether the fluid to be measured is flowing in the forward direction in the flow path with respect to the preset direction. Or although the structure which discriminate | determines whether it is flowing in the reverse direction was shown, if it is a structure which can discriminate | determine the flow direction of a fluid to be measured, it will not be limited to the structure discriminate | determined based on the rotation direction of the rotor 3, It changes suitably Is possible.
Also, other components can be modified or omitted within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Flowmeter 2 Counter 3 Rotor 4 Permanent magnet 5 Detection part 6 Control part 7 Display part 7a Integrated flow rate 7b, 7b 'Pilot lamp 7c, 7c', 7c "Integrated flow rate correction mark 7d Backflow alarm 21 Pulse input part 22 Integration Unit 23 Display unit 51 Magnetic sensor 52 Detection circuit 61 Rotation direction discrimination unit 62 Flow rate calculation unit 63 Memory unit 64 Display control unit 65 Pulse signal output unit

Claims (6)

A detection unit that outputs a detection signal corresponding to the flow rate of the fluid to be measured;
A direction discriminating unit for discriminating a flow direction of the fluid under measurement based on a detection signal output from the detection unit;
A flow rate calculation unit that performs addition / subtraction processing based on a detection signal output from the detection unit and a determination result of the direction determination unit, and calculates an integrated flow rate of the fluid to be measured;
The direction discriminating unit stores the integrated flow rate calculated by the flow rate calculating unit when the flow direction of the fluid to be measured changes from a forward flow flowing in a preset direction to a reverse flow flowing in a direction opposite to the forward flow direction. A memory section;
When the integrated flow calculated by the flow rate calculation unit is greater than or equal to the integrated flow rate stored in the memory unit, a pulse signal is output, and the integrated flow rate calculated by the flow rate calculation unit is stored in the memory unit A pulse signal output unit for stopping the output of the pulse signal when the flow rate is less than the flow rate;
A display control unit that performs display control indicating the stop when the display control of the integrated flow rate calculated by the flow rate calculation unit and the pulse signal output unit stop outputting the pulse signal;
Based on display control of the display control unit, a flow meter provided with a display unit that performs display of the integrated flow rate and display indicating stop of the pulse signal,
A meter system comprising: a counter that calculates and displays an integrated flow rate value of a fluid to be measured based on a pulse signal output from the pulse signal output unit. A rotor that rotates according to the flow rate of the fluid to be measured;
The meter system according to claim 1, wherein the direction discriminating unit discriminates a flow direction of the fluid to be measured based on a rotation direction of the rotor.   3. The meter system according to claim 1, wherein the display control unit displays a pulse signal output stop time of the pulse signal output unit on the display unit.   The meter system according to any one of claims 1 to 3, wherein the display control unit displays a reverse flow rate of the fluid to be measured on the display unit.   5. The display control unit according to claim 1, wherein the display control unit displays a difference between the integrated flow rate calculated by the flow rate calculation unit and the integrated flow rate stored in the memory unit on the display unit. The meter system according to any one of the above. A detection unit that outputs a detection signal corresponding to the flow rate of the fluid to be measured;
A direction discriminating unit for discriminating a flow direction of the fluid under measurement based on a detection signal output from the detection unit;
A flow rate calculation unit that performs addition / subtraction processing based on a detection signal output from the detection unit and a determination result of the direction determination unit, and calculates an integrated flow rate of the fluid to be measured;
The direction discriminating unit stores the integrated flow rate calculated by the flow rate calculating unit when the flow direction of the fluid to be measured changes from a forward flow flowing in a preset direction to a reverse flow flowing in a direction opposite to the forward flow direction. A memory section;
When the integrated flow calculated by the flow rate calculation unit is greater than or equal to the integrated flow rate stored in the memory unit, a pulse signal is output, and the integrated flow rate calculated by the flow rate calculation unit is stored in the memory unit A pulse signal output unit for stopping the output of the pulse signal when the flow rate is less than the flow rate;
A display control unit that performs display control indicating the stop when the display control of the integrated flow rate calculated by the flow rate calculation unit and the pulse signal output unit stop outputting the pulse signal;
A flow meter comprising: a display unit configured to display the integrated flow rate and to display the stop of the pulse signal based on display control of the display control unit.

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