JP4135230B2 - Gas shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off device for ensuring safety in use of gas after use of a gas meter, and more particularly to an error of the internal clock.
[0002]
[Prior art]
Conventionally, this type of gas shut-off device is shown in FIG. In the figure, the flow rate sensor unit 1 outputs a flow rate signal A corresponding to the gas flow rate passing through the gas passage, and the flow rate determination unit 2 calculates the gas flow rate value B when receiving the flow rate signal A of the flow rate sensor unit 1. . The pointer value holding unit 3 integrates the gas flow rate value B of the flow rate determining unit 2 and holds it as a pointer value D, and the clock unit 4 outputs a pointer value transmission time signal C when the time reaches a preset time. Further, when the external communication means 5 receives the pointer value transmission time signal C of the clock unit 4, the external communication unit 5 transmits the pointer value D of the pointer value holding unit 3 to the outside.
[0003]
[Problems to be solved by the invention]
However, in the conventional gas shut-off device, until the current time is newly set <once it is set at the time of shipment from the factory, it is not corrected until the lifetime (10 years), or every time the guideline value is transmitted (every month) Update> Accumulated errors.
As a result, the meter reading center that conducts centralized meter reading from the outside (using a public telephone line, etc.) is set so that the pointer value is sent to each gas shut-off device to be metered in sequence without delay. However, since an error occurs in the time when the guide value is transmitted, there is a problem in that the guide value transmission between the gas cutoff devices is congested.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention receives the internal current time in the gas shut-off device and the external current time sent from the outside using a public telephone line or the like, and the internal current time and the external current time The internal current time is automatically corrected thereafter. As a result, the deviation of the current time can be reduced.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate that passes through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and the gas flow rate of the flow rate determination unit A pointer value holding unit that accumulates and holds the values as a pointer value; a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time; and a pointer value transmission time signal of the clock unit Externally transmitting the pointer value of the pointer value holding unit to the outside and outputting the external current time when receiving the current time from the outside; acquiring the external current time from the external communication unit; An error determination unit that obtains an internal current time, calculates an error from the difference and holds an error correction value, and the error correction value of the error determination unit when the internal current time of the clock unit becomes an error correction time To the resulting to new internal current time is one having a error correcting unit for correcting.
[0006]
A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage; a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit; and the flow rate determination unit A pointer value holding unit that accumulates gas flow values and holds them as a pointer value, a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time, and the pointer value transmission time signal of the clock unit When receiving, the pointer value of the pointer value holding unit is transmitted to the outside, and the external communication means for receiving the automatic time correction data from the outside, and when the automatic time correction data is acquired from the external communication means, the time correction coefficient is held. A correction data unit; and an automatic correction unit that acquires the time correction coefficient of the correction data unit and corrects it to a new internal current time when the internal current time of the clock unit becomes an error correction time. .
[0007]
A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage; a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit; and the flow rate determination unit A pointer value holding unit that accumulates gas flow values and holds them as a pointer value, a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time, and the pointer value transmission time signal of the clock unit Upon receipt, the external communication means for transmitting the pointer value of the pointer value holding unit to the outside, the temperature input means for acquiring the current temperature from the temperature sensor, and the temperature input when the internal current time of the clock unit becomes the error correction time And a temperature correction unit that acquires the current temperature from the means and corrects it to the new internal current time.
[0008]
A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage; a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit; and the flow rate determination unit A pointer value holding unit that accumulates gas flow values and holds them as a pointer value, a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time, and the pointer value transmission time signal of the clock unit When receiving, externally transmitting means for transmitting the pointer value of the pointer value holding unit and receiving the current time from outside, external communication means for outputting the current current time; temperature input means for acquiring the current temperature from a temperature sensor; and the external When the external current time is acquired from the communication means, the internal current time is acquired from the clock unit, an error determination unit that calculates an error from the difference and outputs an error correction value, and the error correction value of the error determination unit The error analysis unit that acquires the current temperature of the temperature input means, calculates a temperature error coefficient and an individual error correction value and holds the error analysis value, and the internal current time of the clock unit corrects the error. An error integrated correction unit that acquires the error analysis value of the error analysis unit and the current temperature of the temperature input means and corrects the current internal time when the time comes.
[0009]
Furthermore, a flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a flow rate determination unit A pointer value holding unit that integrates and holds the gas flow rate value as a pointer value, a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time, and the pointer value transmission time signal of the clock unit , The external communication means for transmitting the pointer value of the pointer value holding unit to the outside, the correction signal input means for acquiring the time correction timing from the outside, and the timepiece clock when the time correction timing is acquired from the correction signal input means A correction signal processing unit that acquires the internal current time of the unit and corrects it to the new internal current time.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
(Example 1)
FIG. 1 is a functional block diagram of a gas cutoff device according to Embodiment 1 of the present invention. FIG. 2 is a program flow diagram of the first embodiment.
[0012]
In FIG. 1, the flow sensor unit 1 outputs a flow signal A corresponding to the gas flow rate passing through the gas passage (for example, the flow rate signal A may be output when a certain gas passes through the gas passage). The same effect can be obtained by using a flow rate sensor that can measure the instantaneous flow rate in the gas passage.) The flow rate determination unit 2 calculates the gas flow rate value B from the flow rate signal A of the flow rate sensor unit 1.
[0013]
The pointer value holding unit 3 integrates the gas flow rate value B of the flow rate determining unit 2 and holds it as a pointer value D. When the clock unit 4 reaches a preset time (for example, “determination is“ more than time ”so as not to skip the set time determination because the following time correction is performed”), the pointer value transmission time signal C Is output.
[0014]
When the external communication means 5 receives the pointer value transmission time signal C of the clock unit 4, the pointer value of the pointer value holding unit 3 is externally provided (for example, a meter reading center that uses a public telephone line to centrally measure the gas shut-off device). When D is transmitted and the current time is received from the outside, the external current time E is output.
[0015]
When the error determination unit 6 acquires the external current time E from the external communication unit 5, the error determination unit 6 acquires the internal current time F from the clock unit 4, and calculates an error from the difference (for example, the internal current time acquired for the first time and the external current time). An error per unit time is calculated by dividing the time difference and the difference between the internal current time acquired externally and the external current time obtained by dividing the time difference by the elapsed time of the external current time), and the error correction value G is held.
[0016]
The error correction unit 7 determines that the internal current time F of the clock unit 4 is the error correction time (for example, the time when the previously determined error per unit time is 1 second elapses, and thereafter the time correction is performed at each error correction time. The error correction value G of the error determination unit 6 is acquired and corrected to the new internal current time H.
[0017]
Next, the operation and action will be described. FIG. 2 shows a program flow of the above means from process T1 to process T18. Now, it is assumed that the flow from the start to the end of processing is periodically processed by an interval calendar or the like.
[0018]
In the flow rate sensor unit 1 of the gas shut-off device, the process T1 detects the flow rate of the gas passing through the gas passage and shifts to the process T2. The process T2 proceeds to the process T3 when there is a gas flow rate, and proceeds to the process T5 when there is no gas flow rate (for example, the flow rate may be detected every time a certain amount of gas passes through the gas passage. The same effect can be obtained by using a flow sensor that can measure the instantaneous flow rate in the gas passage).
[0019]
In the flow rate determination unit 2, the process T3 calculates a gas flow rate value (for example, in a small gas shut-off device, the flow rate signal that appears when a certain gas passes through the gas passage is 0.6 L, so the gas flow rate value is 0. 6L), and the process proceeds to process T4. In the guide value holding unit 3, the process T4 holds the sum of the gas flow rate values and proceeds to the process T5.
[0020]
In the external communication means 5, a time setting message for changing the current internal time of the gas shut-off device has been transmitted from the outside (for example, a metering center that centrally measures the gas shut-off device using a public telephone line) in process T5. If the time setting message is not transmitted, the process proceeds to process T6.
[0021]
In the error determination unit 6, the process T6 proceeds to process T7 if the time setting message has been sent for the first time, and proceeds to process T9 if it is not the first time. The process T7 holds the external time 1 of the time setting message sent from the outside, and proceeds to the process T8. In process T8, the internal time 1 of the gas shut-off device is held, and the process proceeds to process T14.
[0022]
The process T9 holds the external time 2 of the time setting message sent from the outside, and proceeds to the process T10. In process T10, the internal time 2 of the gas shut-off device is held, and the process proceeds to process T11.
[0023]
In process T11, an error (for example, the external elapsed time obtained by subtracting external time 1 from external time 2 is further subtracted by the internal elapsed time obtained by subtracting internal time 1 from internal time 2. This elapsed time difference is divided by the external elapsed time. (The error per unit time is calculated. Note that the external time is always corrected to Japan Standard Time, and if the error is calculated multiple times, it should be added to the error per unit time previously calculated.) The calculation proceeds to process T12.
[0024]
In the error correction unit 7, the process T12 holds an error per unit time and proceeds to the process T13. In the error determination unit 6, the process T13 moves the external time 2 to the external time 1 and the internal time 2 to the internal time 1, and moves to process T14. In the clock unit 4, the process T14 updates the internal time and proceeds to the process T15.
[0025]
In the error correction unit 7, the process T15 determines whether the time for correcting the error has elapsed (whether the unit time has elapsed). If it has elapsed, the process proceeds to process T16 and has not elapsed. If so, the process proceeds to process T17. In process T16, the internal time is corrected and the process proceeds to process T17. In the external communication means 5, the process T17 determines whether the transmission time of the pointer value has elapsed. If the transmission time has elapsed, the process proceeds to process T18, and if the transmission time has not elapsed, the process ends. In process T18, the guide value is transmitted to the outside, and the process ends.
[0026]
(Example 2)
FIG. 3A is a functional block diagram of the gas shutoff device according to the second embodiment of the present invention. FIG. 3B is an example of temperature characteristics of a crystal oscillator that creates a reference clock for operating a microcomputer. FIG. 4 is a program flow diagram of the second embodiment. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0027]
The difference from the first embodiment is that in the functional block diagram of FIG. 3A, when the correction data unit 8 acquires the time automatic correction data J from the external communication means 5, the time correction coefficient I (for example, FIG. 3B) is obtained. Temperature coefficient data, coefficients to be multiplied with temperature correction data, error data due to individual differences of crystal oscillators, and a temperature calendar in which changes in annual temperature in each region are converted into data.
[0028]
The automatic correction unit 9 acquires the internal current time F from the clock unit 4 and, when an error correction time held in advance (for example, at 23:00 on the first day of every month), an error from the time correction coefficient I of the correction data unit 8 is obtained. (For example, the temperature fluctuation from the previous correction date to the current correction date is extracted from the temperature calendar held in advance. The extracted temperature fluctuation is integrated using the data value of the temperature characteristic data, and the coefficient is added to this. The error is further multiplied by an individual difference) and corrected to the new internal current time H.
[0029]
Next, a specific description of operation and action will be given with reference to FIG.
FIG. 4 shows a program flow of the above means from process T1 to process T22. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0030]
However, processing T5 to processing T13 and processing T15 are omitted. In the case where there is no gas flow rate, the process T2 shifts to the process T19, the process T4 shifts to the process T19, and the process T14 shifts to the process T21.
[0031]
In the external communication means 5, the process T19 determines whether or not the automatic time correction data has been received from the outside. If the automatic time correction data is received, the process proceeds to the process T20. If the automatic time correction data is not received, the process T14 is performed. Migrate to
[0032]
In the correction data unit 8, when the time T correction data J is acquired in the process T20, the time correction coefficient I (for example, temperature characteristic data, a coefficient to be multiplied with the temperature correction data, error data due to individual differences of crystal oscillators, (Temperature calendar, etc. in which changes in annual temperature in each region are converted into data) are held, and the process proceeds to process T14.
[0033]
In the automatic correction unit 9, the process T 21 acquires the internal current time, determines whether or not the error correction time is held in advance (for example, at 23:00 on the first day of every month), and proceeds to the process T 22 in the case of the error correction time. If it is not the error correction time, the process proceeds to process T17.
[0034]
The process T22 calculates the new internal current time from the time correction coefficient (for example, extracts temperature fluctuations from the previous correction date and time to the current correction date and time from the temperature calendar held in advance. The extracted temperature fluctuations are the data of the temperature characteristic data. The values are integrated using values, multiplied by a coefficient, and an error due to individual differences is added), and the process proceeds to process T16.
[0035]
(Example 3)
FIG. 5 is a functional block diagram of the gas cutoff device according to Embodiment 3 of the present invention. FIG. 6 is a program flow diagram of the third embodiment. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
The difference from the first embodiment is that in the functional block diagram of FIG. 5, the temperature input means 10 obtains the temperature around the hardware circuit of the gas shut-off device, and corresponds to that temperature from the actual temperature. The current temperature K is acquired by (b) (temperature correction data value can be acquired).
[0036]
The temperature correction unit 11 obtains the current temperature K from the temperature input means 10 and corrects it to the new internal current time H when the internal current time F of the clock unit 4 becomes an error correction time (for example, every day at 13:00). .
[0037]
It should be noted that the current temperature K of the temperature input means 10 is acquired at an interval (for example, one hour interval) held in advance, and the error correction coefficient is accumulated by linear approximation of the previously calculated temperature correction data value and the difference. When the internal current time F becomes the error correction time, the same effect can be obtained by correcting to the new internal current time H using the accumulated correction coefficient. Next, a specific description of the operation and action will be given with reference to FIG.
[0038]
FIG. 6 shows a program flow of the above means from process T1 to process T24. In addition, the thing of the same code | symbol as Example 1 and Example 2 has the same structure, and abbreviate | omits description. However, process T5 to process T13, process T15, process T19 to process T20, and process T22 are omitted. In the case where there is no gas flow rate, the process T2 shifts to the process T14, the process T4 shifts to the process T14, and the process T21 shifts to the process T23 when the automatic correction time comes.
[0039]
In the temperature correction unit 11, the process T21 acquires the internal current time, determines whether or not the error correction time is held in advance (for example, every day at 13:00). If it is not the correction time, the process proceeds to process T17. In the temperature input means 10, the process T23 acquires the current temperature from the temperature sensor, and proceeds to the process T24.
[0040]
In the temperature correction unit 11, the process T23 obtains a correction value from the temperature characteristic data of FIG. 3b (if the correction value is 1 second or less, it holds a fractional value of less than 1 second and uses this fractional value at the next error correction time. The correction value of the new internal current time is calculated, and the process proceeds to process T16.
[0041]
Example 4
FIG. 7 is a functional block diagram of the gas cutoff device according to Embodiment 4 of the present invention. FIG. 8 is a program flow diagram of the fourth embodiment. In addition, the thing of the same code | symbol as Example 1 and Example 3 has the same structure, and abbreviate | omits description.
[0042]
The difference from the first embodiment and the third embodiment is that, in the functional block diagram of FIG. 7, when the error analysis unit 12 receives the error correction G of the error determination unit 6, the error analysis unit 12 acquires the current temperature K of the temperature input unit 10. Error coefficients and individual error correction values (Estimated errors are individually estimated and errors due to temperature characteristics are made clear in the first to third embodiments, so that error correction can be performed more accurately.
[0043]
For example, the temperature characteristic error is calculated by setting the coefficient to be applied to the temperature characteristic portion to a fixed value of 0.5, and the time obtained by subtracting the correction value due to the temperature characteristic from the actual error time is calculated as the error of the individual crystal oscillator. Alternatively, the coefficient obtained by multiplying the error analysis result calculated at the first time and the temperature characteristic portion of the error analysis result calculated at the second time within an arbitrary range, and the time obtained by subtracting the error due to the temperature characteristic from the actual error time becomes the same value. By calculating the coefficient, the error of the temperature characteristic and the error of the crystal oscillator can be estimated), and the error analysis value L is held.
[0044]
When the internal current time F of the clock unit 4 becomes the error correction time, the error integration correction unit 13 acquires the error analysis value L of the error analysis unit 12 and the current temperature K of the temperature input means 10 and corrects them to the new internal current time. By the way.
[0045]
Next, a specific description of the operation and action will be given with reference to FIG.
FIG. 8 shows a program flow of the above means from process T1 to process T31. In addition, the thing of the same code | symbol as Example 1 and Example 3 has the same structure, and abbreviate | omits description.
However, processing T13, processing T19 to processing T22, and processing 24 are omitted. The process T8 shifts to the process 25, the process T12 shifts to the process T26, and the process T15 shifts to the process T23 if the time for correcting the error in the internal time has elapsed. In the error analysis unit 12, the process T25 maintains the current temperature 1 and proceeds to the process T14, and the process T26 retains the current temperature 2 and proceeds to the process T27.
[0046]
In process T27, a temperature error coefficient (for example, an error of the temperature characteristic is calculated by setting the coefficient to be applied to the temperature characteristic portion to a fixed value of 0.5) and the process proceeds to process T28. In process T28, individual error correction (for example, a time obtained by subtracting the correction value based on the temperature characteristic from the actual error time is calculated as an error of the crystal oscillator individual), and the process proceeds to process T29. In process T29, the current temperature 2 is shifted to the current temperature 1, and the process proceeds to process T13.
[0047]
In the error integration correction unit 13, the process T30 acquires a correction value from the temperature characteristic data of FIG. 3b (if the correction value is 1 second or less, the fractional value of less than 1 second is held and this fractional value is used at the next error correction time. ), A temperature correction value is calculated, and the process proceeds to process T31. In process T31, the correction value of the new internal current time is calculated in consideration of the error of the individual crystal oscillator, and the process proceeds to process T16.
[0048]
(Example 5)
FIG. 9 is a functional block diagram of the gas cutoff device according to Embodiment 5 of the present invention. FIG. 10 is a program flow diagram of the fifth embodiment. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0049]
The difference from the first embodiment is that, in the functional block diagram of FIG. 9, the correction signal input means 14 receives a signal from the time correction timing M (for example, a function for automatically correcting the time by analyzing a time signal on a television or the like). Receive). When the correction signal processing unit 15 acquires the time correction timing M from the correction signal input means 14, the correction signal processing unit 15 acquires the internal current time F of the clock unit 4 and corrects it to the new internal current time H.
[0050]
Next, a specific description of the operation and action will be given with reference to FIG.
FIG. 4 shows a program flow of the above means from process T1 to process T33. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0051]
However, processing T5 to processing T13, processing T15, processing T16, and processing T19 to processing T31 are omitted. In the case where there is no gas flow rate, the process T2 shifts to the process T14, the process T4 shifts to the process T14, and the process T14 shifts to the process T32.
[0052]
In the correction signal input means 14, the process T32 determines whether or not there is a time correction timing (for example, a signal is received from a function that automatically corrects the time by analyzing a time signal on a television or the like). If it is not time correction timing, the process proceeds to process T17. In the correction signal processing unit 15, the process T33 corrects the internal time and proceeds to the process T17.
[0053]
【The invention's effect】
As apparent from the description, the gas shutoff device of the present invention provides the following effects. According to the first aspect of the present invention, until the current time is newly set <once set at the time of factory shipment, there is no correction until the lifetime (10 years) or the time is updated every time the guideline value is transmitted (every month)> By setting the time several times for the operation that has accumulated the errors, the error of the internal time can be calculated, and thereafter the correction can be automatically performed. Therefore, even if the meter reading center that centrally measures the gas shut-off device from the outside using a public telephone line etc. is set to transmit the guide value to each gas shut-off device to be metered sequentially without delay, the guide value Since the error of the internal time at the time of transmission is reduced, it is possible to prevent congestion due to the transmission of the guide value between the gas cutoff devices. In addition, since the meter reading center does not need to set the time each time, the communication time corresponding to the time setting time can be shortened, and not only the processing capacity at one meter reading center is improved, but also the gas shut-off device has a time By reducing the number of communications by setting, the margin of the battery driving the gas cutoff device can be reduced. This makes it possible to design a battery with a small capacity, and by using a small battery, the gas shut-off device can be miniaturized, or the product life can be extended even if a battery with the same capacity is used. Can do.
[0054]
Further, according to the second aspect of the present invention, by correcting the temperature of the crystal oscillator that generates the reference clock of the gas shut-off device, it is possible to correct the correction in the case where an error in summer / winter is likely to occur. The error can be further reduced and the error can be further reduced.
[0055]
Further, according to the third aspect of the present invention, the temperature correction of the theoretical value (the model value of the temperature fluctuation) in the second aspect of the present invention 2 is obtained by acquiring the temperature of the gas shut-off device that is actually installed. By correcting, the error can be corrected more accurately.
[0056]
Further, according to the fourth aspect of the present invention, the error caused by the temperature included in the first to third aspects of the present invention and the error of the crystal oscillator can be distinguished, and the temperature-dependent error can be calculated more accurately.
[0057]
Furthermore, according to the fifth aspect of the present invention, a time error can be eradicated by acquiring a correction signal that is periodically and error-free from the outside.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a gas shut-off device according to a first embodiment of the present invention. FIG. 2 is a program flow diagram of the device. FIG. 3A is a functional block diagram of a gas shut-off device according to a second embodiment of the present invention. b) Temperature characteristic diagram of the device FIG. 4 Program flow diagram of the device FIG. 5 Functional block diagram of the gas shutoff device of Example 3 of the present invention FIG. 6 Program flow diagram of the device FIG. Functional block diagram of a gas shut-off device according to a fourth embodiment of the present invention. FIG. 8 is a program flow diagram of the device. FIG. 9 is a functional block diagram of a gas shut-off device according to a fifth embodiment of the present invention. Flow diagram [Fig. 11] Functional block diagram of a conventional gas shut-off device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flow sensor part 2 Flow rate determination part 3 Pointer value holding part 4 Clock part 5 External communication means 6 Error determination part 7 Error correction part 8 Correction data part 9 Automatic correction part 10 Temperature input means 11 Temperature correction part 12 Error analysis valve 13 Error Integrated correction unit 14 Correction signal input means 15 Correction signal processing unit

Claims (5)

A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a gas flow rate value of the flow rate determination unit A pointer value holding unit that accumulates and holds as a pointer value, a clock unit that outputs a pointer value transmission time signal when the time reaches a preset time, and externally when the pointer value transmission time signal of the clock unit is received An external communication unit that transmits the pointer value of the pointer value holding unit and outputs the external current time when the current time is received from the outside; and when the external current time is acquired from the external communication unit, the internal current time is obtained from the clock unit. An error determination unit that calculates an error from the difference and holds an error correction value; and when the internal current time of the clock unit becomes an error correction time, acquires the error correction value of the error determination unit to obtain a new internal current time In Gas cutoff apparatus provided with an error correction unit that positive for. A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a gas flow rate value of the flow rate determination unit A pointer value holding unit for accumulating and holding as a pointer value, a clock unit for outputting a pointer value transmission time signal when the time reaches a preset time, and receiving the pointer value transmission time signal of the clock unit to the outside An external communication unit that transmits the guideline value of the pointer value holding unit and receives automatic time correction data from the outside, and when the automatic time correction data is acquired from the external communication unit, a correction data unit that holds a time correction coefficient, and A gas shut-off device comprising: an automatic correction unit that acquires a time correction coefficient of the correction data unit and corrects it to a new internal current time when the internal current time of the clock unit becomes an error correction time. A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a gas flow rate value of the flow rate determination unit A pointer value holding unit for accumulating and holding as a pointer value, a clock unit for outputting a pointer value transmission time signal when the time reaches a preset time, and receiving the pointer value transmission time signal of the clock unit to the outside External communication means for transmitting the pointer value of the pointer value holding unit, temperature input means for acquiring the current temperature from the temperature sensor, and acquiring the current temperature from the temperature input means when the internal current time of the clock unit becomes an error correction time A gas shut-off device comprising a temperature correction unit that corrects to the new internal current time. A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a gas flow rate value of the flow rate determination unit A pointer value holding unit for accumulating and holding as a pointer value, a clock unit for outputting a pointer value transmission time signal when the time reaches a preset time, and receiving the pointer value transmission time signal of the clock unit to the outside An external communication unit that transmits the pointer value of the pointer value holding unit and outputs the external current time when receiving the current time from the outside, a temperature input unit that acquires the current temperature from the temperature sensor, and an external current time from the external communication unit Is obtained from the clock unit, calculates an error from the difference and outputs an error correction value, receives the error correction value of the error determination unit, receives the temperature input An error analysis unit that obtains a current error temperature, calculates a temperature error coefficient and an individual error correction value, and holds an error analysis value; and when the internal current time of the clock unit becomes an error correction time, an error of the error analysis unit A gas shut-off device comprising an integrated error correction unit that acquires an analysis value and a current temperature of the temperature input means and corrects the new internal current time. A flow rate sensor unit that outputs a flow rate signal corresponding to a gas flow rate passing through the gas passage, a flow rate determination unit that calculates a gas flow rate value from the flow rate signal of the flow rate sensor unit, and a gas flow rate value of the flow rate determination unit A pointer value holding unit for accumulating and holding as a pointer value, a clock unit for outputting a pointer value transmission time signal when the time reaches a preset time, and receiving the pointer value transmission time signal of the clock unit to the outside External communication means for transmitting the pointer value of the pointer value holding unit, correction signal input means for acquiring time correction timing from the outside, and acquisition of the time correction timing from the correction signal input means acquires the internal current time of the clock unit And a correction signal processing unit for correcting to the new internal current time.

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