JPH01263453A - Water level detecting device - Google Patents

Abstract

PURPOSE:To enable a faulty condition of a water level sensor to be detected by a method wherein a water level signal discriminating means may input a water level data to judge whether a combination of water level signals detected by a plurality of water level detectors is normal or not and then if the combination is abnormal, the means may output an abnormal signal. CONSTITUTION:A water level signal discriminating means 12 may input a water level data outputted by a water level signal inputting means 5 to judge whether a combination of water level signals detected by water level sensors 2, 3 and 4 is normal or not. If it is abnormal, it may output an abnormal signal. In this case, a normal combination of the water level signals has only four combinations. Thus, in the case that any of the water level sensors 2, 3 and 4 is faulty in their ON states or OFF states to show an abnormal combination, the water level signal discriminating means 12 may judge it and output an abnormal signal. As its abnormal signal is inputted to the operating controlling means 6, a water reduction informing lamp 7, a full water informing buzzer 11, a heater 9 and a hot water circulation pump 10 are terminated for their operations. Thus, it is possible to prevent the water reduction informing lamp 7 or the full water informing buzzer 11 from being erroneously operated due to a trouble of the water level sensors 2, 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water level detection device in a hot water expansion tank of a hot water heating system or a hopper of an automatic hot water supply system.

2. Description of the Related Art A conventional water level detection device for a hot water heating system includes a plurality of water level detectors 2.
3.4 is installed to detect high water level, medium water level, and low water level respectively. Then, the water level signals detected by the water level detectors 2, 3.4 are inputted by the water level signal input means 5, and transmitted to the operation control means 6 as water level data. The operation control means 6 controls the operation based on the input water level data,
When the water level drops and the middle water level detector 3 turns off, the water reduction warning lamp 7 lights up, prompting the user to pour water. When the water level further decreases and the low water level detector 4 turns off, the heat exchanger 8 that warms the hot water is heated, but the operation of the heater 9 such as a svarna and the pump 10 that circulates the hot water is stopped. When the user pours water, the water level rises and the high water level detector 2
When turned on, the full water alarm buzzer 11 would sound.

Problems to be Solved by the Invention However, in the conventional configuration, if the middle water level detector 3 is turned off and malfunctions even though the water level is above the middle water level, the low water alarm lamp 7 is turned off.
If it lights up by mistake, or if the high water level detector 2 turns on even though the water level is below the high water level, the full water alarm buzzer 1 will turn on.
There was an issue where 1 was ringing incorrectly.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to detect a failure of a water level detector.

Means for Solving the Problems In order to solve the above problems, the water level detection device of the present invention includes a plurality of water level detectors, and a water level sensor that inputs a plurality of water level signals from the plurality of water level detectors and outputs water level data. A water level signal determination unit that inputs water level data output by a signal input means and the water level signal input means, determines whether a combination of water level signals detected by the plurality of water level detectors is normal, and outputs an abnormal signal if it is abnormal. It is equipped with means.

Effect: With the above-described configuration, the present invention inputs water level signals detected by a plurality of water level detectors by the water level signal input means and outputs them as water level data. Then, the water level signal determining means inputs the water level data and determines whether the combination of water level signals detected by the plurality of water level detectors is normal or not, and if the combination of water level signals is abnormal due to a failure of the water level detectors, Outputs an abnormal signal.

Embodiment An embodiment of the present invention will be described based on the drawings. Fig. 1 is a system configuration diagram of a hot water heating system equipped with a water level detection device, which is an embodiment of the present invention.
Detect high water level, medium water level, and low water level respectively. Reference numeral 5 denotes water level signal input means, which inputs the water level signals detected by the water level detectors 2, 3.4 and outputs water level data. Reference numeral 12 denotes water level signal determination means, which inputs the water level data output by the water level signal input means 5 and determines whether the combination of water level signals detected by the water level detectors 2 and 3.4 is normal, and if abnormal, it is determined as abnormal. Output a signal.

Here, there are only four normal combinations of water level signals as shown in FIG. Therefore, the water level detector 2. 3.
4 has an on-failure or an off-failure, resulting in an abnormal combination as shown in FIG. 3, the water level signal determining means 12 determines this and outputs an abnormal signal. and,
When the abnormality signal is input to the operation control means 6, the operation of the low water alarm lamp 7, the full water alarm buzzer 11, the heater 9, and the hot water circulation pump 10 is stopped.

Therefore, it is possible to prevent the low water alarm lamp 7 and the full water alarm buzzer 11 from operating erroneously due to a malfunction of the water level detectors 2, 3.4.

Effects of the Invention According to the present invention, when the water level detector malfunctions and the water level signals become an abnormal combination, the abnormal signal can be outputted by the water level signal determination means, so that the abnormal combination can be detected. Water level signals can prevent equipment and systems equipped with water level detection devices from malfunctioning.

Therefore, the reliability of the water level detection device and the devices and systems equipped with it can be improved.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of a hot water heating system equipped with an embodiment of the water level detection device of the present invention, Fig. 2 is a diagram showing a normal combination of water level signals, and Fig. 3 is an abnormality of the water level signal. FIG. 4 is a system configuration diagram of a hot water heating system equipped with an embodiment of the prior art. 2, 3. 4...Water level detector, 5...Water level signal input means, 12...Water level signal determination means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure? / . Figure 2 □ 970' /6 / Figure 3

Claims (1)

[Claims] a plurality of water level detectors; water level signal input means for inputting a plurality of water level signals from the plurality of water level detectors and outputting water level data; A water level detection device comprising water level signal determining means for determining whether a combination of water level signals detected by a water level detector is normal and outputting an abnormal signal if the combination is abnormal.