How the water level is measured and how to measure the water level

It is a cable with a depth scale, when it touches the water, it forms a loop through the water, (the water is equivalent to a switch), and then there is a loop display or indicator on the ground, the cable needs to mark the depth scale, and the scale is written down when the cable hits the water. It's still more troublesome to do, and you can sell it directly online, and now it's sold online.

<> a lot of people say that it is a variety of float meters, laser ranging, ultrasonic, probes or something high-tech, oops, can really pit people, expensive and unstable, play a few times on the well to feed the well, do not solve the actual problem at all, these people have not measured the well water level a few times, do not know how to measure the well water level, as a 10 years of hydrogeology veteran, let me tell you, except for the simple loop type of well water level measurement rope, other TM are. Just buy it online, how convenient it is to use, our entire industry is using this thing to measure the well water level, except for the automatic probe used to do the pumping test, the other running well point surveys are used to measure the artificial water level rope, don't listen to some nerds foolishly.

Just use the well water level measurement rope, there are such products sold on the Internet, black line, white indicator box.

Well water level electric measuring rope.

FYC-3 float type water level sensor, using photoelectric or contact series encoders, with precision speed change mechanism, wire wheel, stainless steel wire rope, heavy hammer, wave hammer and float, etc. The sensor is installed above the logging head or the gauge pipe, when the liquid level changes, the float rises or falls, the measuring rope drives the wire wheel to do a rotating movement, and the encoder coaxially connected with the wire wheel outputs the digital signal corresponding to the liquid level and sends it to the intelligent measurement and control instrument, so as to achieve the purpose of real-time measurement and display of the liquid level.

The sensor has reasonable structure, strong anti-interference ability, high resolution, large range, long life, signal tracking memory function after power failure, it can be used for long-term liquid level measurement and can ensure the stability and reliability of performance, it is an ideal liquid level sensor for rivers and lakes, reservoirs, locks, hydropower stations, hydrological stations, water plants and petrochemical industries.

Technical indicators: 1. Detection range: 0-5m, 10m, 20m, 32m; 40m ，80m ，320m

2. Measurement accuracy: range 1

3. Resolution: 1mm; 1cm

4. Return: 2mm

5. Working voltage: DC5V-30V

6. Long transmission distance: 1200m

7. Output signal: a. Basic type: parallel gray code signal (b).

B. Intelligent type: 4-20mA standard analog signal (A), RS485 serial signal (C), C, SSI synchronous serial signal (S).

8. Environmental parameters: temperature -20 +80, relative humidity 95% (RH40).

The first thing to do in water level measurement is to confirm the purpose of the measurement, whether to monitor the height of the water level in real time or to alarm at a certain location to determine whether to choose a switch or a continuous Zhengsen touch sensor, the simplest is to have a water level probe.

1. Capacitive type.

Capacitive water level switch principle: It is a small capacitance difference change caused by detecting water level changes, and the signal processing is carried out by a special ADA capacitance detection chip, which can output a variety of signal communication protocols.

2. Electronic.

Electronic water level switch principle: through the built-in electronic probe to detect the water level, and then by the chip to process the detected signal, when judging that there is water, the chip output high level of 24V or 5V, etc., when judging that there is no water, the chip output 0V.

3. Electrode type.

Principle of electrode water level switch: The electrode water level switch is composed of a primary electrode sensor and a secondary controller, the liquid level switch is installed on the top of the container or on the wall of the container, and the electrode is inserted into the liquid.

4. Photoelectric type.

Photoelectric liquid level switch principle: it uses infrared detection, using the principle of refraction and reflection of light, and the light will be reflected or refracted at the interface of two different media.

The water mark is just a simple mark, which can be engraved on the product by simply engraving it on the production tool.

There are two rows of scales on the inner tank, one row represents the amount of water used to cook rice, assuming that the rice cooker is 3L, and the scale is or 6; The 4L scale is 8; The 5L scale is 10. Use the measuring cup of the rice cooker to measure the rice, 1 cup of rice corresponds to 1 scale of water, boil 6 cups of rice, waterproof to the 6th scale, and cook the rice from the Duan Yan Guess Xiangpei is more delicious.

Another row of scales represents the amount of water used to cook porridge, which means the water mark corresponding to 1 cup of rice, which means the amount of water corresponding to a cup of rice. The amount of water to cook porridge can be increased or decreased according to the thickness of your needs, but it should not exceed the water level scale, and it is easy to overflow.

There are three types of rice cooker liner materials:

1. Aluminum liner.

Advantages: Aluminum conducts heat evenly, is easy to form, is more beautiful, can be compounded with other metals or alloys, and is the main material for mid-range pots.

Disadvantages: In the actual use process, the aluminum liner cannot be in direct contact with food, and the surface must be protected.

2. Stainless steel liner.

Advantages: The best stainless steel liner is made of 304 plate, which has excellent stainless steel corrosion resistance and good intergranular corrosion resistance.

Disadvantages: Because the dissolution of harmful metals of 201 stainless steel that can be purchased in China is generally difficult to meet the national hygiene standards for stainless steel tableware containers, the rice cooker with stainless steel liner with a very low price must be carefully selected.

3. Composite multi-layer material liner.

Advantages: The composite multi-layer material liner is made of a variety of materials, divided into two layers of composite plate liner with outer aluminum and inner steel, and its inner surface is stainless steel, which not only meets the requirements of stainless steel on the inner surface, but also improves the thermal conductivity of stainless steel by using the overall heat soaking effect of aluminum.

The water level line is inside the water tank, and the water tank is the place where the water is supplied and stored, and there is a positioning line in the water tank, which is called the "water level line". The water level is determined according to different water consumption, water key height and tank capacity.

The highwatermark is a line that represents the surface water or groundwater level in professional drawings such as geological section drawings of engineering geology, geotechnical engineering, water conservancy and hydropower engineering, etc., which is called the water mark. The line type is a dashed line, and the symbol is below plus three line segments of decreasing length.

Function: The water mark is just a simple logo, which can appear on the product as long as it is engraved on the production abrasive. There is usually no or only one water mark, but some toilets are marked with two water lines.

Some toilets have two water marks, the basic water mark and the maximum water mark. The minimum water level is required to be no lower than the next water mark, and the highest water level cannot exceed the maximum water mark. Because if the water stored in the tank does not reach a certain amount, it may produce less siphon force, which affects the flushing effect, and it is necessary to flush repeatedly, and if the water volume is too much, it will overflow, which will also cause a waste of water resources.

The water mark serves as a measure of the water level.

Commonly used are water gauges and water level gauges. The draft survey is a traditional and effective direct observation device. When measured, the reading on the water gauge plus the zero elevation of the water gauge is the water level.

A water level gauge is an instrument made by using the principles of floats, pressure, and sound waves that can provide information about the fluctuation of the water surface. The water level gauge can directly draw the process line of the water level change. The water level process line recorded by the water level gauge should be checked using the records of other items observed at the same time.

The water gauge and water level gauge are set in the place where the river is straight, the section is relatively regular, the water flow is stable, there is no diversion oblique flow and no obstruction of rocks; Generally avoid wharves, docks and sites where large quantities of industrial and municipal wastewater are discharged into obstruction of observations, so that the measured water level and the information of other items observed at the same time are representative and accurate; In order to stabilize the relationship between water level and flow, it is generally necessary to avoid the influence of fluctuating backwater and the influence of upstream and downstream damming and water diversion.

Monitoring Center: Main hardware: server, client, mobile data line or GPRS data transmission module Data-6123. Main software: operating system software, database software, water level monitoring system software, firewall software.

Communication network: Internet public network + China Mobile GPRS network.

Terminal equipment: micropower measurement and control terminal Data-6216, mains power supply, solar power supply, battery power supply optional.

Measuring equipment: water level gauge or water level transmitter.

Commonly used are water gauges and self-gauges.

Water level refers to the elevation of the free water surface of a water body above the fixed base surface. It is measured in meters. It is represented by the English letter "z".

According to the different structural forms of the water survey, it can be divided into upright type, inclined type, low pile type, and cantilever type. When observing, the reading of the water surface on the draft plus the elevation of the zero point of the draft is the water level value at that time.

The self-counting water level meter can record the continuous process of water level changes, and can also transmit the observed data to the database in the form of numbers or images, so that the water level observation work tends to be automated and telemetric.

The function of water level observation is to directly provide data with independent use value for water conservancy, water transportation, flood control and flood control, and also provide indirect application data for extrapolating other hydrological data. Water level observations include the basic gauge and the specific water level of the precipitation gauge.

The observation of the basic water gauge, when the water level changes slowly (including the daily variation), is observed once a day at 8 o'clock and 20 o'clock, also known as the 2-stage system, the daily variation amplitude is within the dry season, the observation is carried out with the 1-stage system, the daily variation is at the time, the observation is carried out with the 4-stage system, and when there are peaks and valleys, the measurement should be added. The purpose of the observation of the specific precipitation gauge is to calculate the specific fall of the water surface and analyze the roughness of the riverbed, and the number of observations depends on the needs.

There are usually two types of base planes used to express water levels: one is the absolute base plane and the other is the base surface of the station.

As of 2014, the absolute base surface adopted by China is the base surface of the Yellow Sea, which is based on the characteristic sea surface of a coastal site in the mouth of the Yellow Sea. In order to make the water level of each station easy to compare, the conversion relationship between the Yellow Sea and the base surface of Wusong was noted in the "Hydrological Yearbook".

The electric measuring rope of the well water level, or the well water level measuring instrument, is a thin black wire, with a meter scale on it, and the range is 0-500m, which is to measure the well water level through the electrical signal, and the probe is lowered into the well, and the indicator table of the wellhead will react when it touches the water, and the scale at the wellhead is the buried depth of the well water level, which is the distance from the well water level to the wellhead.

The multimeter can be used to measure the water level with a length label of the rope (wire) that can be used to measure the water level, and the loop is displayed on the universal meter through the surface and the well water, and the length of the rope in the well is the depth of the water level, not to mention the thousands of automatic water level observation and recording instruments, this method is now the most economical and convenient manual method for measuring a single water level in the world. There are some sold on the Internet, which are easier to use than a multimeter, and you can search for "measuring well water level" on a certain treasure.

The open container adopts the submersible type, which is relatively simple and reliable; For closed, pressurized containers, it is recommended to use differential pressure or magnetic flaps.

Float switches are now widely used to measure water levels, and they are easy and convenient!

Ultrasonic water level tester can directly see the water level value and signal remote transmission.

Many people say that they use all kinds of water level gauges, all kinds of float gauges, laser ranging, ultrasonic, probes or something high-tech, by it, it can really pit people, it is expensive and unstable, and it is fed to the well after playing a few times. These people have not measured the well level a few times at all. As a veteran of hydrogeology for 10 years, I tell you that except for the simple loop well water level measurement rope, all other TMs are nonsense.

You don't have to do it yourself now, you can sell it on the Internet, how convenient it is to use, don't listen to some nerds.

The water mark (high water mark) is the line that represents the blind travel of surface water or groundwater level in the geological section drawings of engineering geology, geotechnical engineering, water conservancy and hydropower engineering, etc., which is called the water line. The line type is a dashed line, and the symbol is below plus three line segments of decreasing length.