HS code mapping for re-importation

List of the catalog of this article:

• 1, What is the working principle of the liquid level switch?
• 2, What are the characteristics of the electrode dual-color water level meter
• 3, Hello, I have a question. What is the principle of measuring the water level of a solar water heater? Why is it always at 60kΩ...
• 4
  、liquid level single closed-loop control principle
• 5,HS code mapping for re-importation How to balance the double-capacate water tank
• 6, What is the difference between the liquid level pid control system of the double-capacity water tank system and the single-capacity water tank system

What is the working principle of the liquid level switch?

The working principle of the water level switch, the capacitive water level switch uses a special ADA capacitance detection chip for signal processing according to the change of the small capacitance difference caused by detecting the change of the water level, and can output a variety of signal communication protocols.

Sound fork liquid level switch ● Working principle: Sound fork liquid level switch is a new type of liquid level switch. It is designed and made using the principle of tuning fork vibration.

The principle of water level switch The water level switch is also known as water level pressure switch, water level sensor and water level controller. It uses the pressure generated by the high and low tide of the water level in the laundry bucket to control the on-off of the contact switch. The structure is shown in the figure below. The water level switch is connected to the gas chamber mouth on the lower side of the water bucket with a plastic hose.

The working principle of the tuning fork liquid level switch is to make the tuning fork vibration at a certain resonance frequency through a pair of piezoelectric crystals installed on the base.

What are the characteristics of the electrode dual-color water level meter?

It has the following characteristics: clear water level display, bright color, large observation angle, and long visual distance. It is suitable for all kinds of medium and low pressure boilers, which are not affected by water quality, with stable performance and long service life.The water level can be displayed from a distance to any position. High and low water level sound and light alarm.

The water level meter adopts a diode cold light source, which has good viewing effect, adjustable brightness, long life, easy maintenance, low energy consumption, and a wide viewing range. After the water level meter is installed, the light source basically does not need to be adjusted, and you can see gas red and liquid green. The ruler has a light source, which is conducive to night viewing. If a water level meter is installed for monitoring, there is no need to add another lighting source to the scene.

The two-color water level meter is reliable to use and the display is intuitive. It can be connected to the central control room through the camera, which is an ideal boiler water level meter. However, you should pay attention to regular flushing, and some manufacturers' product bulbs have a short life and need to be replaced frequently. Magnetic flip plate level meter. It is also a vertical pipe.

Make the gas phase red and the liquid phase green. Nowadays, many manufacturers call liquid level meters that can identify liquid levels in different colors as two-color liquid level meters.In fact, the former refers to a measurement principle, and the latter refers to a display form. The former has good performance under high temperature and high pressure, while the latter has advantages in cost and scope of application.

Hello, I have a question. What is the principle of measuring the water level of a solar water heater? Why is it always at 60kΩ...

1. Conductive detection principle The principle of conductive water level sensor is to use the conductivity of water to detect the height of the water surface, and use resistance connections for switch control. The principle of float detection The principle of float is to detect the height of the water surface through the interruption of the reed at different heights.

2, conductive water level water temperature sensor (probe): There is also a temperature probe in the middle of the sensor. At present, more than 50% of the sensors of solar water heaters are conductive sensors, which has the advantages of low cost and easy installation; the biggest disadvantage is that it is greatly affected by the quality of water, is easy to scale, and has a service life of about one year.

3. The water level sensor in the solar water heater transmits the perceived water level signal to the controller. The computer in the controller compares the actual measured water level signal with the set signal to obtain the deviation. Then, according to the nature of the deviation, it sends a switch instruction to the water supply electric valve to ensure solar thermal The water level reaches the set water level.

liquid level single closed-loop control principle

1. The basic working principle of the closed-loop control system is as follows: (1) Detect the actual value of the controlled amount or output quantity;(2) Compare the actual value with the given value to obtain the deviation value; (3) Use the deviation value to produce control and adjustment effects to eliminate the deviation. This kind of system based on the feedback principle, which corrects the deviation by detecting the deviation, is called a closed-loop control system.

2. Control according to the information of changes in the system output, that is, by comparing the deviation between the system behavior (output) and the expected behavior, and eliminating the deviation to obtain the expected system performance.

3. Most of the controls implemented in management are closed-loop control, and the control principle used is mainly the feedback principle.

4. The basic principle is the same as the steel belt level meter, but it has an accurate force sensor and servo system to form a closed-loop adjustment system. By considering the gravity of the steel belt itself, the height of the float is accurately adjusted to balance buoyancy and gravity, and the current liquid level to the top of the tank is obtained to obtain the liquid level value.

5. The so-called feedback principle is to control according to the information of the system output changes, that is, to obtain the expected system performance by comparing the deviation between the system behavior (output) and the desired behavior and eliminating the deviation.

How to balance the dual-caporate water tank

1. First of all, the zero point of the double chamber equilibrium level meter needs to ensure that the positive and negative pressure chamber is filled with condensate. Secondly, close the balance valve and open the positive and negative phase valves. Finally, close the vapor-liquid phase valve of the double chamber balance container at the same time.

2. I) There are 2 adjustable bottom corners (2 in the front row) at the bottom. When you find that the refrigerator is unflat or shaking, adjust the bottom foot to level the refrigerator. Rotating the bottom foot clockwise can raise the refrigerator, and rotating the bottom foot counterclockwise can lower the refrigerator.

3. In addition, if you are sure that the height of your B water tank needs to reach is H, then you just need to put your inlet pipe position a few centimeters higher than the height of the B water tank H.

4. The real dual water tank system is to divide the two water tanks into solar energy sets.Hot water tank (specialized in absorbing and storing solar energy) and hot water supply tank (water tank constant temperature control, water tank temperature directly controls the start and stop of the auxiliary heat source), this system is energy-saving and safe.

5. First of all, close the balance gate under the premise of ensuring that the positive and negative pressure chamber of the single-chamber balance container is filled with condensate. Secondly, open the positive and negative phase gate. Finally, open the gas-liquid phase valve of the double-chanter balance container to complete the debugging.

6. Thermostat knob adjustment method: The refrigerator temperature controller knob generally has 0 and 7 gears. The larger the number, the lower the temperature in the freezer. Generally, we put it in the 3rd gear in spring and autumn. It depends on your requirements and whether the freezer can reach below minus 18 degrees.

What is the difference between the liquid level pid control system of the dual-capacitance water tank system and the single-capacitance water tank system

1. The single-capacitance liquid level control system has only one storage tank, so there is no lag effect, the response speed is faster, and it is easier to achieve stable control.

2. The integral effect is enhanced. The enhancement of the integral effect makes the system unstable and becomes a second-order system, and the output may oscillate, which makes the dual-capacitance liquid level control system more difficult to stabilize than the single-capacity liquid level control system. The proportion should be increased while the integral action is enhanced.

3. Because the double volume is equivalent to the series of two single volumes, it becomes a second-order system, and the output may oscillate. The single volume is a first-order system, and the output is exponentially monotonically converged.

4. The coolant used in different regions is also different. AppearAll cars use special coolant, and pure water can be used in a short-term emergency, but you have to go to a professional car repair shop to repair the cooling system immediately, then clean the cooling system, and then add a new coolant. The coolant can be replaced with a cycle of two years or 20,000 kilometers.

5. More energy-saving. The double-capacity water tank is a very cost-effective refrigerator. The purpose of liquid level control is to be more energy-saving and more power-saving.