JP2922593B2 - Integrated value abnormality monitoring device in integrating flow meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronic flow meter for measuring and integrating the supply amounts of gas, water, electric power, and the like, and relates to a device for monitoring an abnormality in the integrated value. is there.

[Conventional technology]

As a so-called automatic meter reading system for integrating a flow pulse and sending the integrated value to a center in a conventional integrating flow meter, JP-A-64-12652 is known.

[Problems of the prior art]

This known example has no problem when there is no abnormality in the integrated value, but when an abnormality occurs in the integrated value due to electrical noise or other causes, or when an abnormality occurs in the integrated value of the communication means, There is a problem that no action can be taken.

[Means for solving the problem]

The present invention is proposed in view of such a point, and the configuration is as follows.

A main operation circuit having a flow rate calculation and integration function, a unit flow rate signal generation function, an integration abnormality determination function, and an abnormality signal output function; and a unit flow rate integration function for integrating a unit flow rate signal output from the unit flow rate signal generation function, A monitoring circuit having a sending function of sending the integrated value integrated by the unit flow integrating function to the integrated value abnormality determining circuit of the main arithmetic circuit;

It should be noted that the monitoring circuit may be configured to send the integrated value to the main arithmetic circuit every certain time interval or every time a certain amount is added.

[Action]

The main arithmetic circuit calculates and integrates the flow rate measured by the flow rate sensor to function as a meter, and outputs a unit flow rate signal to the monitoring circuit every time a constant flow rate is integrated. The monitoring circuit integrates the unit flow rate signal and outputs the integrated value to the integrated value abnormality determination circuit of the main arithmetic circuit at fixed time intervals or every time a fixed amount is added. The integrated value abnormality determination circuit compares the integrated value calculated by the main arithmetic circuit with the integrated value input from the monitoring circuit, and determines that the integrated value is normal when the difference between the integrated values is within a preset range. Continue to accumulate as it is,
If it is out of the range, it is determined to be abnormal and an abnormal signal is output to the monitoring circuit. When an abnormality signal is input, the monitoring circuit notifies the abnormality to, for example, a monitoring center.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The reference numeral 1 designates a main operation circuit. The main operation circuit 1 calculates a flow rate signal output from the flow rate sensor to calculate an integrated value of the flow rate, and a flow rate calculating and integrating function 2; It comprises a unit flow rate signal generating function 3 for outputting a unit signal every time integration is performed, and an integrated value abnormality determination and abnormality signal output function 4.

Reference numeral 5 denotes a monitoring circuit. The monitoring circuit 5 includes a unit flow rate integrating function 7 for integrating the unit flow rate signal output from the unit flow rate signal generating function 3 and a constant time interval (or every time a constant amount is integrated). A sending function 6 for outputting the unit flow integrated value to the integrated value abnormality determination and abnormality signal output function 4 of the main processing circuit 1 and a time interval of generation of the unit flow signal are measured, and from this time interval, the usage status (supply amount). And a use function judging function 8 for issuing an alarm or closing the shut-off valve when it is judged that the use is abnormal, and a communication function 9 for transmitting the integrated value or the abnormality of the main processing circuit 1 to the monitoring center. I have.

The integrated value abnormality determination circuit and abnormality signal output function 4
Compares the integrated value that changes every moment with its own and the production value based on the unit flow rate signal.If the value is within a predetermined range, it is determined to be normal. And records the occurrence time, and sends an abnormal signal from the communication function 9 to the monitoring center.

(Effect of the present invention)

According to the present invention, the abnormality of the integrated value is instantaneously determined, and the integrated value and the use status at that time are notified. Therefore, the integrated value is output without noticing the abnormality, and there is no worry that the integrated value becomes the basis of the charge calculation.

[Brief description of the drawings]

 The figure is an explanatory view of the device according to the present invention. 1 Main calculation circuit 2 Flow rate calculation and integration function 3 Unit flow signal generation function 4 Integrated value abnormality judgment and abnormality signal output function 5 Monitoring circuit 6 Transmission function 7 Unit flow rate integration Function 8: Usage status judgment function 9: Communication function

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G01F 15/07 G08C 19/00 301 G08C 15/07

Claims (2)

(57) [Claims] 1. A main arithmetic circuit having a flow rate calculation and integration function, a unit flow signal generation function, an integration abnormality determination function, and an abnormality signal output function, and a unit for integrating a unit flow signal output from the unit flow signal generation function. A monitoring circuit having a flow rate integrating function and a sending function of sending an integrated value integrated by the unit flow rate integrating function to an integrated value abnormality determining circuit of a main arithmetic circuit; 2. The integrated value abnormality monitoring device for an integrated flow meter according to claim 1, wherein the integrated value is sent to the main arithmetic circuit every time a predetermined time interval or a predetermined amount is integrated in the monitoring circuit.