JPH01422A - Water level detection end operation confirmation device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operation confirmation device for confirming whether or not the operation of a water level detection end using an electrode rod is normal.

(Problems to be solved by conventional technology and invention) -C
The method of using an electrode rod to detect the water level is often used, but in the case of canned water from boilers, for example, the concentration of impurities is high, and the electrode rod is insulated with scale attached to it, causing the water level to drop. If the system is used without knowing this, an abnormal rise or fall in the water level may not be detected, which could lead to an accident.

The present invention eliminates the drawbacks of the conventional method by detecting the conduction state of the electrode rod at predetermined short intervals and detecting an abnormal state by the combination of conduction signals or the quasi-transfer mode. The object of the present invention is to provide a water level detection end operation confirmation device that can immediately detect abnormalities caused by short circuits and prevent accidents.

[Means for solving problems]

The present invention is equipped with IMn electrode rods having lower end heights different from each other, and is turned on by contacting the lower end of each electrode rod with a liquid.
In an operation confirmation device for a water level detection end which is configured to issue an OFF signal when a signal is issued and there is no contact, the operation of detecting the signal of the electrode rod is repeated at predetermined short intervals to check the signal. Compared to the detection state at a certain point in time, a change in the detection state at the next point in time is a failure if the signals of two or more electrode rods change from ON to OFF or from OFF to ON at the same time. Water level detection end operation &1! It is an authentication device.

[For production]

The confirmation device of the present invention checks the signals from the electrode rods 2, 3, 4, and 5 at each measurement point at predetermined short intervals (for example, about 7 milliseconds) during boiler operation, and then checks the combination of signals. Anomalies are detected by the mode in which the combination of signals changes when the state or measurement time changes.

For example, water level fluctuations cannot occur in a very short period of time, such as about 7 milliseconds. If the signals of two or more electrode rods change from O to 1 or from 1 to O at the same time, it is assumed that at least one of the electrode rod lines is faulty. .

〔Example〕

The present invention will be explained with reference to the drawings based on examples.

In the figure, four electrode rods 2.degree. 3.4.5 are provided as detection ends in order to detect the water level of water such as canned water in a boiler. The lower end of each electrode has a height of 52.3° and 4.5°, and the height of each lower end corresponds to the following water level.

Electrode t*2...Level H----Water level electrode rod 3 that will stop the water supply pump if it exceeds this level---Level M---Water level electrode rod 4 that will cause the water supply pump to operate if it is below this level -------Level L...--- Water level electrode rod 5 that will cause combustion in the boiler if the level is higher than this Level C--Reference water level each electrode rod 2. 3. 4. 5, there is continuity when its lower end is in contact with the liquid, giving a signal 1;
No signal is emitted when there is no contact (this state can be defined as
Suppose that the signal is O).

In this embodiment, for example, as shown in the flowchart of FIG. 2, if MLC is 0010 then L fault 1) 01 then L fault 0101 if L fault otoo then M fault 101) then M fault 1 0 0 0 then It can be estimated that this is an H failure.

Furthermore, since rapid water level fluctuations cannot occur in an extremely short period of time, e.g. about 7 milliseconds, the combination of signals detected at a certain point in time changes to the combination of signals detected at the next point in time. If the signals of two or more electrode rods change from 0 to 1 or from 1 to 0 at the same time, it is estimated that at least one of the electrode rod lines is faulty.

Furthermore, for example, you can stop the combustion while the water pump is running and gradually increase the water level, and make sure that signal 1 is emitted in sequence starting from the lowest level. Gradually decrease the signal and check that the signal becomes 0 starting from the highest level to confirm that it is normal. If not, it is assumed that there is a failure. In addition, if the water level is gradually increased or decreased in this way and the highest level still does not emit a signal l or the lowest level does not become a signal 0 even after a predetermined period of time has elapsed, it is presumed to be malfunctioning. It is.

〔Effect of the invention〕

The present invention provides an operation confirmation device for a water level detection end, in which the operation of detecting the signal of the electrode rod is repeated at predetermined short intervals, and the detection state of the signal is compared with the detection state at a certain point in time.
By adopting a configuration that indicates a failure when the detection state changes at the next point in time, the signals of two or more electrode rods change from ON to OFF or from OFF to ON at the same time, the water level detection terminal The water level detection end operation confirmation device can be used safely by always reliably confirming that the circuit is operating normally, detecting abnormalities due to insulation or short circuits, and preventing accidents due to abnormal water levels. It is highly effective in raking soil safely.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram of electrode rod arrangement, and FIG. 2 is a flowchart of the state of use. 1... Water surface, 2... Electrode rod, 3... Electrode rod, 4.
... Electrode rod, 5... Electrode rod.

Claims (1)

[Claims] (1) Equipped with a plurality of electrode rods having mutually different lower end heights, an ON signal is emitted when the lower end of each electrode comes into contact with the liquid, and an OFF signal is emitted when there is no contact with the water level. In the detection end operation confirmation device, the operation of detecting the signal of the electrode rod is repeated at predetermined short intervals, and the detection state of the signal is compared with the detection state at a certain point in time, and the detection state changes at the next point in time. A water level detection end operation confirmation device, characterized in that it is configured to indicate a failure when the signals of two or more electrode rods change from ON to OFF or from OFF to ON at the same time.