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METHOD AND DEVICE FOR DETERMINING FAILURE OF LIQUID LEVEL SWITCH, METHOD AND DEVICE FOR DETERMINING FAILURE OF LIQUID LEVEL METER, METHOD AND DEVICE FOR CONTROLLING LIQUID LEVEL IN LIQUID TANK, AND LIQUID LEVEL CONTROL METHOD IN LIQUID TANK USING THEM
METHOD AND DEVICE FOR DETERMINING FAILURE OF LIQUID LEVEL SWITCH, METHOD AND DEVICE FOR DETERMINING FAILURE OF LIQUID LEVEL METER, METHOD AND DEVICE FOR CONTROLLING LIQUID LEVEL IN LIQUID TANK, AND LIQUID LEVEL CONTROL METHOD IN LIQUID TANK USING THEM
PROBLEM TO BE SOLVED: To provide a method and a device for detecting a failure of liquid level switches 6 or a liquid level meter 9, and a method and a device for detecting the liquid level, operating or stopping a pump 2 automatically, and thereby controlling surely the liquid level, even if the liquid level switches 6 or the liquid level meter 9 fail.;SOLUTION: Each determination level by the liquid level switches 6 and the liquid level meter 9 is provided respectively on a plurality of spots having each different height in a liquid tank 100 so that each height is shifted mutually. When an actual liquid level detected by the liquid level meter 9 to a determination level by some liquid level meter is changed from a low position to a high position or from a high position to a low position, if a liquid level switch which is different from a naturally-supposed ON/OFF pattern of the liquid level switches exists, the liquid level switch is determined to be failed.;COPYRIGHT: (C)2009,JPO&INPIT
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