JPH11183233A - Water level gauge - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a highly reliable water level gauge. SOLUTION: The water level gauge of the present invention has an automatic water level diagnostic function 7 for comparing a water level detection signal detected by a water level meter 1 with an external signal, calculating a difference value, and automatically diagnosing the water level detection signal.
And a correction function 8 for correcting and adjusting the zero point of the water level detection signal when the diagnosis value diagnosed by the automatic water level diagnosis function 7 exceeds the signal deviation set value. According to the present invention, the operational safety of the water level gauge can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level gauge for measuring water level, liquid level, powder level, and the like of clean water, sewage, deep wells, rivers, and the like.

[0002]

2. Description of the Related Art In the prior art, when a water level gauge is installed or at the time of maintenance, zero point adjustment and span adjustment of the water level meter are performed, and the water level is measured based on the set zero point and span.

[0003]

In the prior art, the zero point adjustment and the span adjustment after the installation of the water level gauge cannot be performed automatically. Until manually adjusted again
It is used at the zero point and span where the water level gauge is off.

Accordingly, an object of the present invention is to provide a water level gauge capable of detecting a deviation of a water level signal due to a positional deviation or the like and automatically performing correction such as zero point adjustment and span adjustment.

[0005]

According to a first aspect of the present invention, there is provided a water level gauge having a reference water level meter for outputting a reference water level signal by measuring a preset fixed reference water level. When the reference water level gauge emits a reference water level signal, the measured water level is corrected to the reference water level to perform zero adjustment.

A water level meter according to a second aspect of the invention is characterized in that it has a function of adjusting the span of a water level signal by inputting two or more reference water levels.

The water level meter according to the third aspect of the present invention compares the reference water level and the measured water level, and if the difference between the reference water level and the measured water level is equal to or greater than a predetermined set value, determines that a failure has occurred and outputs a failure signal. It is characterized by having.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the water level meter of the present invention will be described. In FIG. 1, a water level setting function 6 includes a water level meter 1.
The external signal recognition function 5 is a function of recognizing and inputting a fixed reference level (water level) 2 from an external signal such as an electrode type level switch 4.

The automatic water level diagnostic function 7 is connected to the water level gauge 1 and the water level setting function 6, and compares the water level detection signal detected by the water level gauge 1 with an external signal input via the external signal recognition function 5. Then, it is a function of calculating the difference value and automatically diagnosing the water level detection signal.

The correction function 8 is an automatic water level diagnosis function 7.
And a function for correcting and adjusting the zero point of the water level detection signal when the diagnostic value diagnosed by the automatic water level diagnostic function 7 exceeds the signal deviation set value.

An external signal can be input via the reference level contact 3.

That is, the water level meter 1 has a structure in which a fixed reference level contact by a level switch 4 such as an electrode type is input from the outside. Then, when the water level passes through the reference level due to the fluctuation of the water level, the reference level and the water level signal are compared, and the difference is corrected (zero point adjustment).

Further, when two or more reference level contacts are input, the span is adjusted when the water level reaches the reference level 2 as shown in FIG. 2 so that the difference between the reference level and the water level signal exceeds a certain value. In this case, it is determined that a failure has occurred, and a failure signal is output. The function of recording the correction content of the water level signal and the history of the failure diagnosis as an overnight record is added, and the record can be viewed later.

That is, a contact signal of a level which becomes a fixed reference water level is externally inputted to one or more water level gauges by an electrode type level switch or the like, and when the actual water level passes through the reference point,
A contact signal is input from the outside, and the difference between the water level signal and the reference water level is automatically corrected by zero adjustment. Span adjustment is also performed by inputting two or more reference water level contacts. When the difference between the water level signal and the reference water level exceeds a certain value, it is determined that the water level gauge has failed and a failure signal is output.

With this configuration, even if the water level fluctuates, the zero point adjustment and the span adjustment of the water level signal can be automatically performed. In addition, failure diagnosis of the water level signal can be automatically performed. Then, since the water level signal can be automatically corrected, the water level gauge is not shifted due to an external factor such as a position shift of the water level gauge, and the accuracy of the water level signal is higher than that of the conventional water level gauge. Further, when the water level signal indicates an abnormal value in the measurement range due to a failure of the water level meter, the failure can be automatically determined.

[0016]

According to the present invention, the operational safety of the water level gauge can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water level gauge showing one embodiment of the present invention.

FIG. 2 is a configuration diagram for explaining the operation of FIG. 1;

[Explanation of symbols]

 1 Water level gauge 2 Reference level 3 Reference level contact 4 Level switch 5 External signal recognition function 6 Water level setting function 7 Automatic water level signal diagnosis function 8 Correction function

Claims (3)

[Claims] A reference level gauge for outputting a reference level signal by measuring a preset fixed reference level;
A water level gauge which measures a common water level with the reference water level gauge and, when the reference water level gauge emits the reference water level signal, corrects the measured water level to the reference water level to perform zero adjustment. 2. The water level gauge according to claim 1, further comprising a function of adjusting a span of a water level signal by inputting two or more reference water levels. 3. A function for comparing a reference water level and a measured water level, and when the difference between the reference water level and the measured water level is equal to or more than a predetermined set value, determines that a failure has occurred and outputs a failure signal. The water level gauge according to claim 1.