Water level measurement device, water level measurement method and water level correction method

Abstract

The invention provides a water level measurement device, which comprises an electrode part and a signal processing unit, wherein the electrode part comprises an earthed reference electrode, a measuring electrode and a correction electrode; the length of the reference electrode is equal to that of the measuring electrode; the length of the correction electrode is smaller than that of the referenceelectrode; and at least one end of each of the three electrodes is flushly and mutually fixed; and the signal processing unit which is electrically connected with the electrode part is used for loading a fixed frequency signal to the measuring electrode and the correction electrode, and determining a water level value according to a detected frequency attenuation signal between the reference electrode and the measuring electrode. The invention also provides a water level measurement method and a water level correction method. The use of the device can reduce influences of environmental factors and obtain continuous and accurate water level values.

Description

technical field [0001] The invention relates to a water level measuring device and a water level measuring and correcting method. Background technique [0002] Water storage appliances, such as solar water heaters, need to detect and control the water temperature and water level in the water tank. Such home appliances have relatively high requirements on the measurement accuracy of the water level detection device. [0003] At present, there are mainly two types of water level sensors used for water level detection, one is capacitive liquid level sensor, the metal tube of this kind of liquid level sensor is connected to the junction box, and its measurement circuit adopts AC bridge circuit and start-up simulation, etc. circuit. This kind of water level sensor is easily affected by the length of the wire and the climate, resulting in poor signal quality and low measurement accuracy. [0004] The other is a resistance temperature liquid level measurement device. This sensor...

AI Technical Summary

Problems solved by technology

This water level sensor is easily affected by the length of the wire and the climate, resulting in poor signal quality and low measurement accuracy

[0004] The other is a resistance temperature liquid level measuring device. This sensor has only a few poles, so it can only send out segmented signals and cannot obtain continuous and accurate water level values.

[0005] Both of these sensors require the water in the water tank to be charged, which makes the surface of the sensor easy to scale, which can easily cause various failures

Also, environmental factors such as water quality can affect the versatility of the sensor

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