JPH07294309A - Water level measuring system - Google Patents

Abstract

PURPOSE:To achieve prevention of failure in measurement because of a trouble or the like by monitoring a water level constantly based on a water level doubled to select the water level decided to be correct by a certain fixed algorithm. CONSTITUTION:Water level meters 11 and 12 are set at a specified location where a water level is to be measured to detect a water level constantly. Detection data are converted to BCD codes to be inputted into an automatic water level selector 20, which 20 determines any one of the water levels to be correct by a judgment according to a fixed algorithm based on the two water level data taken. For example, a checking is made to spot an instantaneous input data error, such as parity error, errors other than that of BCD, abnormality in a counter part converter and the like. When any error is found and if the data from the water level meter 11 is normal while the data from the water level meter 12 is abnormal, the automatic water level selector 20 selects the instantaneous input data from the water level meter 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level measuring system in which a water level gauge for water level observation is doubled to prevent missing.

[0002]

2. Description of the Related Art Conventionally, it has been common to observe the water level with one water level gauge. However, the observation with one water level gauge will be missed (unmeasurable) if the sensor or the body of the water level fails for some reason, and it will affect the statistical processing of data. become. In this case, the above problem can be solved by using two water level gauges for water level observation. However, simply duplicating the water level gauge does not make it possible to know which data level is obtained from which water level gauge when one of the water level gauges fails.

[0003]

The present invention has been made to solve such a problem, and when a water level gauge is duplicated, a water level judged to be accurate is automatically selected by a certain algorithm. By doing so, it is an object of the present invention to realize a water level measuring system that prevents a failure due to equipment failure or abnormal water level.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a duplicated water level gauge and data from both of the water level gauges are taken in, and errors in the data taken in, errors in the other side water level gauge, and water level measurement of both water level gauges. An automatic water level selection device that determines the output data of the water level gauge that is judged to be accurate from the above two water level gauges due to the range abnormality, the water level change abnormality due to the water level gauge, and the longest time over which the water level does not change. Be prepared.

[0005]

In the present invention as described above, the water level observed by the duplicated water level gauge is constantly monitored, and the water level determined to be accurate is automatically selected by a certain algorithm.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a measuring system according to the present invention. In the figure, 11 and 12 are water level gauges, 20 is C
A water level automatic selection device consisting of a PU board, to which both water level gauges are connected. Output 21 of automatic water level selection device 20
Is sent to a measuring device (not shown) as a telemeter output.

The water level gauges 11 and 12 are installed in a predetermined place such as a river where the water level should be measured, and both water level gauges constantly detect the water level, and the detected data is converted into a BCD code to the automatic water level selection device 20. It is captured. The automatic water level selection device 20 determines one of the water levels judged to be accurate by a certain algorithm based on the two acquired water level data. The determined water level data is sent to the measuring device as a telemeter output.

Here, there are the following conditions that are preconditions for determining whether the two water level data are normal or abnormal. A-Measurement water level upper / lower limit ... Water level measurement effective range of water level gauges 11 and 12 Designated water level ... Standard water level switching that allows selection of water level on the safe side when it is not selectable ... Main water level meter in water level area Example: 0 to Water level up to 100 cm, water level gauge 11 as main water level gauge 101-200 cm as Middle area water level, water level 12 as main water level gauge 201-300 cm as High area water level, water level gauge 11 as main Tolerance of water level meter ... Difference between two water levels Continuity ... Amount of change between previous water level and current water level by water level meter Zero fluctuation time ... Longest time to judge normal when water level does not change Hysteresis width ... Prevention of frequent water level gauge switching

On the other hand, there are the following items for judging whether or not the data obtained from the two water gauges are accurate: B-Error in data to be taken (eg parity error, BC
Error other than D code) Abnormality of water level meter on the other side (Example: Abnormality of sensor, Abnormality of low battery) Abnormality of measured water level range due to A- Abnormality of water level change due to A- (Discontinuity) No water level change Longest time over

When the two water level gauges are both normal and the main water level gauge is set in the water level area C-2 If both water level gauges belong to the same water level area,
Select the main water level side If the data obtained from the two water level gauges are different, select from the water level standard on the safety side. On the other hand, if the main water level gauge is set in the water level area,
If one of the water level standards exceeds the water level standard on the safety side, select that water level, and if both are below the water level standard, select the lower water level.

FIG. 2 shows an automatic water level selecting device 2 according to the present invention.
The flow of the algorithm of the automatic selection process performed at 0 is shown below. The water level data obtained from the water level gauges 11 and 12 installed in the water under measurement such as a river is read into the water level automatic selection device 20. The automatic water level selection device 20 checks the following items based on the read water level data.

First, manual or automatic is selected. When the manual is selected, the data of the designated water level gauge of the water level gauge 11 or 12 is selected. On the other hand, in the case of automatic selection, the automatic water level selection device 20 checks the following items for each water level gauge based on the data obtained from the water level gauges 11 and 12. First, the instantaneous input data obtained from the water level gauges 11 and 12 are checked for errors (for example, a parity error, an error other than BCD, an abnormality of the counterpart converter, etc.). If there is an error, the data from the water gauge 11 is normal and the water gauge 1
When the data from 2 is abnormal, the automatic water level selection device 20 selects the instantaneous input data from the water level gauge 11. In the opposite case, the data from the water gauge 12 is selected. If the data of both water gauges are abnormal, do not select. If there is no error in the instantaneous input data obtained from the water level gauges 11 and 12, it is checked whether or not the water level is within the effective range of water level measurement of each water level gauge. When it is outside the effective range, the water level meter 11 is selected when it is the water level gauge 12, the water level meter 12 is selected when it is the water level meter 11, and when both water level meters are out of the effective range, it is not selected. If the water level measurement range is within the water level measurement effective range of each water level gauge, check the continuity setting, and if so, check whether the measurement mode is continuous. In the continuous measurement mode, check whether there is a change between the previous water level measurement amount and this time measurement amount for each water level gauge. If the amount of change is large, then when it is the water level gauge 12, the water level gauge 11 is selected, and if it is the water level gauge 11, the water level gauge 12 is selected. If the amount of change is large for both water level gauges, neither water level gauge is selected. Has become. If there is no continuity error in both water level gauges, check the fluctuation zero time error. As described in A-, this is the longest time check for determining normal when the water level does not change. If there is a fluctuation zero time error, when the error is the water level gauge 12, the water level gauge 11 is selected. When the error is the water level gauge 11, the water level gauge 12 is selected. It is not selected. If there is no fluctuation zero time error, then it is checked whether the water level switching setting shown by A- is set. In case of water level switching setting, select water level by High, Middle and Low. In this case, when the water level gauges 11 and 12 are both in the same water level area and the water level is Low, the water level meter 11 in the Low area is selected as the main water level gauge. When the water level is Middle, the water level gauge 12 in the Middle area is selected as the main water level gauge, and when the water level is High, the water level gauge 11 in the High area is selected as the main water level gauge. In this case, A-
It is necessary to check the hysteresis due to. on the other hand,
If the water level gauges 11 and 12 cannot be selected in different water level regions, the selected water level is selected. If there is a difference equal to or more than the allowable difference between the two water level gauges instead of the water level switching setting, a selection is made from preset preset water levels. In this case, the selection judgment is made as follows by comparing with the designated water level. a. Designated water level ≤ Water level data from water level gauges 11 and 12 →
Select a higher water level. However, if they are equal, a water gauge 1
Select 1. b. Water level data from water level gauge 11 <designated water level ≤ water level meter 1
Water level data from 2 → Select water level gauge 12. c. Water level meter 12 <designated water level ≤ water level meter 11 → water level meter 1
Select 2. d. Water level data from water level gauges 11 and 12 <designated water level →
Choose a smaller water gauge. However, if they are equal, the water level gauge 11 is selected. In addition, when there is a difference equal to or larger than the allowable difference between the two water level gauges, the automatic water level selection device 20 outputs an abnormal signal.

[0013]

As described above, according to the present invention, by using a predetermined algorithm, it is possible to automatically select the water level judged to be accurate when the water level gauge is duplicated. It is possible to realize a water level measuring system which prevents a missing or abnormal measurement due to an abnormal water level. It should be noted that the present invention is not limited to the water level, and a system with high safety and reliability can be obtained by performing the measurement in duplicate.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of FIG.

[Explanation of symbols]

 11, 12 Water level meter 20 Water level automatic selection device

Front Page Continuation (72) Inventor Hiroshige Kobayashi 1-5-13 Shinkawa, Chuo-ku, Tokyo Inside Yokogawa Wesack Co., Ltd.

Claims (1)

[Claims] 1. A dual water level gauge and data from both of the water level gauges are taken in, and errors in the data taken in,
Abnormality of water level gauge on the other side, abnormality of water level measurement range of both water level gauges,
A water level meter equipped with a water level automatic selection device that determines the output data of the water level gauge that is judged to be accurate among the two water level gauges, for example, due to abnormalities in the water level variation due to the water level gauge, and the maximum time for which the water level does not change. Measuring system.