CN201396976Y - Dual Rod Resistive Solar Water Temperature and Level Sensor - Google Patents

Abstract

The utility model relates to a solar water temperature and water level sensor, which comprises a common electrode, a water level electrode and a control circuit, and is characterized in that the water level electrode is parallel to the common electrode, and the common electrode and the water level electrode are respectively connected with the control circuit. The utility model has a simple structure, and the distance between the electrodes is the same as that of the common electrodes, which can eliminate the influence of polarization on the measurement results and make the measurement results reliable. Can reduce water quality, scale sensitivity to measurement results.

Description

Dual Rod Resistive Solar Water Temperature and Level Sensor

technical field

The utility model relates to a double-rod resistance solar water temperature and level sensor.

Background technique

Basic principle: The environment of the sensor is domestic water, which contains a certain amount of positive and negative ions, and the positive and negative ions in the water, driven by an external voltage, have a certain conductivity and form an equivalent resistance. The sensor is composed of multiple water level electrodes and a common electrode. The water level electrodes are respectively recorded as 1 water level electrode, 2 water level electrodes, 3 water level electrodes, 4 water level electrodes..., among which 1 water level electrode is the bottom. When the water is full to the level 1 electrode, the common electrode and the level 1 electrode are immersed in water at the same time, and the equivalent resistance between the two changes. Similarly, when the water is full to other water level electrodes, the equal resistance between the corresponding water level electrode and the common electrode is changed. Through a certain circuit, the equivalent resistance change between each water level electrode and the common electrode is detected, thereby detecting the corresponding water level state.

The common electrode is at the bottom, and a resistor is connected in series between adjacent water level electrodes, which are denoted as R10, R20, R30, and R40. When there is no water, the overall equivalent resistance of the sensor is R10+R20+R30+R40, and a certain frequency is output to the main controller through resistance-capacitance oscillation (RC oscillation). When the water is full to 1 water level, an equivalent resistance R1 in parallel with R10 is formed between the 1 water level electrode and the common electrode. At this time, the overall equal resistance of the sensor is: (R10 and R1)+R20+R30+R40, thus changing Resistance-capacitance oscillation (RC oscillation) output frequency. Similarly, when the water is full to other water levels, the overall equivalent resistance of the sensor is changed. Through detailed calculation, it can be found that this detection method changes the overall equivalent resistance of the sensor, but the amount of change is not obvious. Therefore, the water quality of the sensor and the scale can easily interfere with the water level test results.

Contents of the invention

The purpose of the utility model is to provide a double-rod resistive solar water temperature and water level sensor.

For realizing the purpose of this utility model, this adopts following technical scheme:

The dual-rod resistive solar water temperature and water level sensor includes a common electrode, a water level electrode and a control circuit, and the common electrode and the water level electrode are respectively connected to the control circuit.

A parallel circuit is adopted among the above-mentioned water level electrodes and connected with the control circuit.

Each water level of the utility model is detected independently. Can reduce water quality, scale sensitivity to measurement results. When testing, MCU port PP is +5V, PN is 0V. When the water level is lower than the 1 water level electrode, the equivalent resistance between the 1 water level electrode and the common terminal is infinite, and the voltage of the chip port A1 is +5V at this time. When the water is full to the 1 water level electrode, an equivalent resistance R1 is formed between the 1 water level electrode and the common electrode, and R1 and R01 divide the voltage. It can detect whether the water is full of 1 water level. Other water levels are also detected in the same way. The chip arranges the status of each water level detection port A1, A2, A3, A4, and communicates with the control board through digital (0 and 1 sequence) communication mode, the communication distance can be relatively long, and the reliability is high.

When in use, an alternating current square wave power supply with a duty ratio of 50% is applied between the common electrode and the others, and the detection of the water level is completed within a certain half cycle. That is to make each water level electrode form positive and negative voltage signals of equal time alternately with respect to the common electrode. The influence of polarization on the measurement results can be eliminated to make the measurement results more reliable. The conduction of water is essentially the conduction of positive and negative ions in water. If the signal is asymmetrical, it is easy to make the positive and negative ions move to the opposite electrode respectively, that is, the positive ions move to the negative electrode, and the negative ions move to the positive electrode, so that the ion concentration in the water is uneven. , The conductivity of water is unstable, which is the so-called polarization phenomenon.

Whether the water is over 1 water level can be detected from the surface chip. Other water levels are also detected in the same way. The chip organizes the status of each water level detection port A1, A2, A3, A4, and communicates with the control board through a digital (0 and 1 sequence) communication method. The communication distance can be relatively long and the reliability is high.

The utility model has a simple structure, and the distance between the electrodes is the same as that of the common electrodes, which can eliminate the influence of polarization on the measurement results and make the measurement results more reliable. Can reduce water quality, scale sensitivity to measurement results.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The following structural drawings further illustrate:

As shown in Figure 1, the double-rod resistive solar water temperature and water level sensor includes a common electrode, a water level electrode and a control circuit.

When testing, MCU port PP is +5V, PN is 0V. When the water level is lower than the 1 water level electrode, the equivalent resistance between the 1 water level electrode and the common terminal is infinite, and the voltage of the chip port A1 is +5V at this time. When the water is full to the 1st water level electrode, an equivalent resistance R1 is formed between the 1st water level electrode and the common electrode, and R1 and R01 divide the voltage. At this time, the voltage of the A1 port of the chip is R01*5V/(R01+R1). It can detect whether the water is full of 1 water level. Other water levels are also detected in the same way. The chip arranges the status of each water level detection port A1, A2, A3, A4, communicates with the control board through digital (0 and 1 sequence) communication mode, the communication distance can be relatively long, and the reliability is high.

Whether the water is over 1 water level can be detected from the surface chip. Other water levels are also detected in the same way. The chip organizes the status of each water level detection port A1, A2, A3, A4, and communicates with the control board through a digital (0 and 1 sequence) communication method. The communication distance can be relatively long and the reliability is high.

The purpose, features and advantages of the utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments. The examples will help to understand the utility model, but do not limit the content of the utility model. All deformations that a person skilled in the art can derive or associate directly from the content disclosed in the utility model shall be considered as the protection scope of the utility model.

Claims (2)

1, two bar resistance-type solar water-temperature water-level sensors, it comprises public electrode, level electrode and control circuit, it is characterized in that level electrode is parallel with public electrode, public electrode is connected with control circuit respectively with level electrode.

2,1 described solar water-temperature water-level sensor as requested is characterized in that: adopt parallel circuit between each level electrode and be connected with control circuit.

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