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Liquid level meters make up a large percentage of wastewater treatment applications and are used in almost every aspect of the entire wastewater treatment process. In wastewater treatment, liquid levels need to be measured for wastewater, sludge, chemical solutions, and so on.In the use of automatic control of the sewage system, the level meter in addition to measuring the level meter, many also involves automatic control of the chain pump start and stop and control the opening and closing of the valve. Therefore, the proper selection of the level meter is very important to reasonably meet the requirements of the production process.I. Radar level meterThe antenna of the radar sensor transmits electromagnetic wave signals in the form of a beam, the transmitted wave is reflected on the surface of the measured material, and the reflected return signal is still received by the antenna. Each point in the emitted and reflected beam is collected by ultrasonic sampling method. The signal is processed by the intelligent processor to derive the distance between the medium and the probe, and sent to the terminal display for display, alarm, operation and so on. Distance from the surface of the material D is proportional to the pulse time travel T: D = C × T / 2 where C is the speed of light due to the distance of the empty tank E is known, then the level L is: L = E - DRadar level meter features:(1) Radar level meter adopts integrated design, no moving parts, no mechanical wear and tear, long service life.(2) Due to the characteristics of electromagnetic wave, it is not affected by the environment. Therefore, the application occasions of its measurement are relatively wide. The probe of the radar level meter has no contact with the surface of the medium, which is non-contact measurement, and can accurately and quickly measure different media. The probe is almost unaffected by temperature, pressure, gas and so on. Can be used in poor working conditions, large changes, water, steam, foam and other ultrasonic level meter can not be competent occasions.(3) Radar level meter is also suitable for use in the agitator, the liquid level is unpredictable, changeable occasions.(4) radar level meter price is relatively expensive, but almost can be applied to sewage treatment process level control process.II. Magnetic flap level meterPrinciple: The liquid level gauge works according to the principle of buoyancy and magnetic coupling. When the liquid level in the measured vessel rises and falls, the float in the main tube of the liquid level gauge rises and falls with it, and the magnet inside the float is transmitted to the field indicator through magnetic coupling, driving the red and white flip column to turn 180°, when the liquid level rises, the flip column turns from white to red, and when the liquid level falls, the flip column turns from red to white, and the red and white boundaries of the indicator are the actual height of the level of the medium in the vessel, so as to realize the indication of the liquid level. When the liquid level drops, the flip column turns from red to white.Features of Magnetic Flip Plate Level Gauge:(1) Simple structure, clear display, intuitive reading, especially suitable for on-site display.(2) Less equipment openings, generally use the magnetic flap level meter with remote output, so that the site and remote monitoring.(3) According to the media, such as easy to dirty and easy to block the media, it is necessary to regularly clean the dominant tube to remove the deposits in the pipeline, in order to ensure the accuracy of the measurement.In the sewage treatment process, the magnetic flip-flop level meter is commonly used in chemical solvent tanks, acid tanks, alkali tanks and other liquid level measurement.III. Ultrasonic level meterUltrasonic level meter is the use of ultrasonic reflection principle at the liquid surface for liquid level away from the degree of detection, that is, the application of echo measurement distance principle work. When the ultrasonic probe transmits a short ultrasonic pulse to the liquid surface, after a time t, the probe receives the echo pulse reflected back from the liquid surface.Therefore the distance from the probe to the liquid surface can be found according to the following formula: set the distance from the ultrasonic probe to the bottom of the container as h, then the actual liquid level. Where, v is the speed of ultrasonic propagation in the measured medium (that is, the speed of sound m / s), which shows that as long as you know the speed of sound v, you can accurately measure the time t, to find out the height of the liquid level H.Features of ultrasonic level meter:(1) ultrasonic level meter can do non-contact measurement, stable and reliable operation: ultrasonic level meter installed in the silo, liquid tank above, not directly contact with the material, to overcome the other models of liquid (material) level meter direct contact with the material and the resulting drawbacks.(2) Can measure a wide range of liquid, lump, powder level can be measured.(3) Can be fixed-point continuous measurement, and can easily provide telemetry and remote control of the measurement signal.(4) Simple and convenient installation, and does not require safety protection.Disadvantages of ultrasonic level meters:(1) ultrasonic level meter measurement will have a blind spot, the installation needs to avoid the blind spot, when the liquid level into the blind spot, the ultrasonic transmitter will not be able to measure the liquid level, so in determining the range of ultrasonic level meter, must leave a margin of the blind spot, installation, the transmitter probe must be higher than the highest level blind spot or so. This will ensure accurate monitoring of the liquid level and ensure the safety of ultrasonic level meter.(2) ultrasonic level meter in the case of foam, because the sound wave can not penetrate the foam, the sound wave will be reflected back in the foam, so that the measurement of the actual level with a large deviation. Foam can be added to the tank container defoamer to reduce the generation of foam to ensure accurate measurement.(3) Ultrasonic level meter in the container with agitator will be affected by the agitator, resulting in the reflection of false reflection echo, resulting in inaccurate measurement. By reducing the speed of the stirrer and installing the level meter away from the center of the stirrer, the influence of the stirrer on the ultrasonic level meter measurement can be reduced.(4) The temperature of the measurement medium also has an impact on the ultrasonic level meter, especially in the closed container, the temperature of the medium and the surrounding temperature temperature temperature difference, the probe will be condensed around the water droplets, which will affect the accuracy of the measurement. Can be installed in the ultrasonic level meter, connected to the compressed air pipe blowing against the probe, to reduce the temperature difference between the medium and the container and the probe condensation of water droplets on the measurement of the impact.IV. Hydrostatic Level GaugeHydrostatic level measurement method is based on the principle that the hydrostatic pressure of the liquid column is directly proportional to the height of the liquid column to achieve the realization of the liquid level measurement through the measurement of the hydrostatic pressure generated by the height of the liquid column. Differential Pressure Level Gauge, which is the use of the principle of working when the level of the liquid in the container is changed, by the hydrostatic pressure generated by the liquid column is also changed accordingly.Hydrostatic level gauge is to measure the liquid level by measuring the static pressure generated by the liquid level height to determine the liquid level. According to P = ρgh, and the density of the liquid ρ, the acceleration of gravity g is known, as long as the measured pressure P, you can find the liquid level h.A kind of pressure instrument for liquid level measurement is input level meter, that is, the level measurement instrument is put into the liquid level to be measured in the medium plants, with the change of liquid level, the pressure transmitter in the diffusion silicon and other pressure detecting elements will be the static pressure is converted into a resistance signal for the detection of the liquid level, the input level meter can be directly put into the medium to be measured.Characteristics of the input pressure level gauge:(1) Simple structure, solid state structure, no moving parts.(2) Quite easy to install and use, long service life.(3) Measuring range is relatively wide, can be measured from water, oil to the viscosity of the phase, etc..(4) It is not affected by the measured medium blistering, deposition, electrical hold, no material fatigue wear, vibration, shock insensitive.(5) Cheap and relatively high reliability.(6) installation, pay attention to choose a relatively smooth fluid, fluctuations in the installation of small places, if you can not avoid the impact of water flow, friction vibration, the need to install isolation pipe, reduce the impact of water flow, to ensure the accuracy and stability of measurement.(7) When installing the input level meter, it is best to leave the bottom of the pool or the bottom of the tank 100mm to 200mm, in order to reduce the bottom of the pool or the bottom of the tank because of silt and sediment media, affecting the accuracy of measurement.(8) in the poor water quality environment, especially when the medium has a lot of suspended solids, impurities, easy to block the pressure hole, affecting the accuracy of measurement. Need to regularly clean the level meter, dredge the pressure hole to ensure accurate and stable measurement.Pressure level meters are suitable for use in processes with good water quality, such as supernatant catchment pools, filtration pools, clearing pools, external discharge pools and SBR pools. It can also be used in thickening and regulating tanks with agitation by installing isolation tubes to avoid sludge impurities at the bottom of the tank.V. SummaryIn summary, due to the process of sewage treatment involves a lot of occasions need to measure the level, but also due to the characteristics of the process of sewage treatment itself, in the selection process, the need for each process and the characteristics of the medium, select the appropriate level meter, the accuracy and reliability of the process measurement of the stability and the economy of service life will have a great impact.It is recommended that in the case of funding allows, try to choose a high precision, low maintenance, long life of the liquid level meter. Make the whole sewage treatment level measurement and control in reliable, stable, safe operation.

In industrial measurement technology, radar level meters are favored for their high accuracy and reliability. However, even such advanced equipment has its limitations - that is, the so-called “blind spot”. Today, we will be in-depth interpretation of this phenomenon, to unravel the mystery of the blind spot of the radar level meter.Radar level meters use microwave signals to measure the height of material in a vessel. When the microwave signal is emitted from the sensor and encounters the surface of the material, part of the signal is reflected back to the sensor and the horizontal height of the material is then calculated based on the time delay. This process is similar to the principle of echolocation, but uses electromagnetic waves rather than sound waves. However, under certain conditions these microwaves may not return to the sensor correctly, resulting in an inability to measure accurately or a complete loss of signal, creating what is known as a 'blind spot'. So what causes this to happen?First and foremost is the physical properties of the material surface. If the surface of the material is very rough or irregular, the microwaves are scattered in multiple directions and only a small portion is reflected back to the sensor. This is like in a dense forest where sound is absorbed and scattered by trees and branches, making it difficult to create a clear echo. In this case, the level meter may not receive enough signal to make an accurate measurement. Another factor is the mounting position and angle. If the level meter is not mounted in the proper position, or the angle is not adjusted optimally, the microwaves may hit the side walls of the vessel instead of reflecting directly back. This is similar to yelling into a valley, where the sound travels along the mountain wall and ultimately does not travel in the direction you want it to. In addition, microwaves travel at different speeds in different media. When there are vapors or other gases in the container, the propagation speed of the microwaves changes, which affects the measurement results. This is similar to how light travels at different speeds in water of different densities, causing the light to refract.Now, let's flesh this out with some more data and examples. Suppose a standard radar level meter has an effective measuring range of 20 meters in air, but in a high-density vapor environment, this range may be reduced to 15 meters or even less. If the actual height of the material in the vessel approaches this changed limit, the level meter may fail to detect the signal, creating a blind spot. One way to solve this problem is to use higher frequency microwaves, which are less sensitive to environmental changes. Another way is to optimize the mounting position and angle of the level meter to ensure that the microwaves are effectively reflected back to the sensor. Also, software algorithms can be used to compensate the measurement data for different environmental conditions.Blind zones in radar level meters are a complex phenomenon involving material characteristics, installation conditions, and environmental factors. Although there are challenges, through scientific analysis and appropriate adjustments, we can minimize the impact of the blind zone to ensure the accurate measurement of the level meter. As the old saying goes: “Know your enemy and know yourself, and you will never be in danger”, a deeper understanding of the working principle and potential problems of radar level meters will make us more comfortable in practical applications.

The level indicator transmitter offers continuous level measurements across a wide range of systems rather than a single point and generates an output signal that directly links to the level within the vessel.   Like other measuring instruments, this tool is also equally important in improving the efficiency of industrial processes by giving accurate and reliable measurements. Have you heard about Kaidi Sensors? It is one of the leading level indicator manufacturers and offers a huge variety of tools and instruments to improve the efficiency of numerous industrial processes. Kaidi Sensors also manufactures a good range of level indicator transmitters and allows you to ensure accurate measurement. To further know about Kaidi’s level transmitter, keep reading. Things to Consider Before Buying Level Indicator TransmitterHow do you select a pressure transmitter? There is a wide range of transmitters, however, before finalizing a level indicator transmitter you must consider some factors and select the transmitter that is best for your specifications and requirements. Let’s discuss these factors in detailProcess MediaThe first thing to consider before buying a level gauge transmitter is the nature of the process media. You must determine clearly whether you need a level transmitter for solid or liquid. Moreover, also decide on what type of solid or liquid you will deal in. For instance, viscous liquids or dirty liquids with mud will block the pressure port of pressure transmitters. Therefore, in the case of viscous liquids, a pressure transmitter is not a good choice. Pressure RangeYou must know the maximum pressure value within the system. Generally, as a rule of thumb, it is always recommended to choose a pressure transmitter having a pressure range of 1.5 times higher than the maximum pressure value within the system. Temperature RangeBesides pressure, it is also important to understand the maximum temperature range of the system. In the case of temperature, the transmitter possesses two temperature ranges i.e., normal operating temperature and compensation range. The normal temperature range is the temperature at which the transmitter performs its function very well without any chances of damage. On the other hand, if the temperature exceeds this range, then it is known as the compensation range. However, the transmitter may not meet performance specifications during application when temperature increases beyond the compensation range. AccuracyIt is also essential to assess the accuracy of the transmitter before deciding on a level indicator transmitter. The accuracy of the transmitter is determined by its hysteresis, nonlinearity, temperature, non-repeatability, zero offset scale, and the influence of temperature. However, you must understand that the higher the accuracy, the higher will be the price of the level gauge with transmitter. Output SignalsThe digital output is expressed as mV, mA, and V. Selecting one output is determined through multiple factors. These factors may include the distance between the system controller and transmitter, interference in the form of noise or electromagnetic signals, and amplifier location. In case you find a need to amplify the signals, then it is always recommended to employ the built-in amplification of the transmitter.In case, your industrial process operates in an environment having high RFI or EMI indicators, then you should also consider specialized protection filters in addition to frequency or mA output.VoltageWhat kind of voltage is suitable for your level indicator transmitter is determined by the type of output signals. In most cases, the transmitters possess built-in voltage regulation, therefore, there are multiple options for supplying voltage. On the other hand, in other cases, transmitters require stable voltage as they have to be configured quantitatively. Therefore, you should always consider both working voltage and system cost when deciding on purchasing a level gauge with transmitter. StabilityDetermining the stability of your transmitter is also a very important aspect to note as it will help you to understand the threshold limit of your transmitter and avoid any kind of performance failure or inconsistency. ProtectionThis factor is mostly overlooked in the majority of cases. However, ignoring this factor can lead to serious consequences in the future.So, before buying a transmitter, you must know suitable working conditions for your transmitter to protect your device, employees, and environment. Kind of ConnectionYou must always be clear on whether to use a short-distance or long-distance connection between your transmitter and electronic equipment as it is also important to ensure the optimal performance of your transmitter. Why Prefer Kaidi Over Others? Kaidi has been offering reliable products to enhance the operational efficiency of various industrial processes since 2012. Having a dedicated team of professionals and designers, the company not only offers a wide range of products but also promises to provide customers with customized solutions. Once you share your specifications and requirements with the company. A special technical session is arranged for you with the experts and depending on your requirements you will get three quotes. You can go with the quote that best matches your specifications. Let’s explore what type of level indicator transmitters are offered by Kaidi Sensors. Why Consider Kaidi for Level Indicator Transmitter - Product highlightsKaidi Sensors has been delivering a high-quality and high-performing level gauge transmitter for more than 20 years. Buying level transmitters from Kaidi Sensors will enable optimal resource optimization and enhance the efficiency of your industrial processes. Does your industrial process occur under high temperature or high pressure? You do not have to worry about whether Kaidi’s transmitter will work under high temperature or pressure as two types of level indicator transmitters are available at Kaidi. Let’s discuss this in detail.Vacuum Pressure TransmitterA vacuum pressure transmitter refers to a mechanical device that estimates the expansive force of a gas or liquid sample. It is also called a pressure transducer. This transmitter is composed of a surface area sensitive to pressure and is composed of silicone, steel, or other materials as per the analyte’s composition. It can be employed in various industrial processes and applications to measure the pressure of fluids, liquids, and gases under varying working equipment. Temperature TransmitterIt refers to an electrical tool that possesses a temperature sensor to separate, intensify, screen noise, and convert signals from sensors to transmit it to the control device. It is specially designed to measure temperature changes and is responsible for altering the small electrical signal from temperature sensors into understandable and readable signals for processing. ConclusionsTo conclude, a level indicator transmitter allows continuous level measurement of both liquid and solid media at any time. Kaidi Sensors offers two types of level transmitters i.e., temperature and pressure transmitters. These transmitters are designed to give precise measurements even during high temperatures and pressure and play a significant role in ensuring optimal resource usage and avoiding spills or accidents. 

It works according to the principle of buoyancy and magnetic coupling. When the magnetic liquid level gauge in the measured vessel rises and falls, the float in the main tube of the magnetic flap level gauge rises and falls with it, and the permanent magnet inside the float is transferred to the field indicator through magnetic coupling to drive the red and white flip columns to turn over 180 °, and when the level rises, the flip columns turn from white to red, and when the level falls, the flip columns turn from red to white, and the indicator's red and white boundaries are the actual height of the liquid level of the medium in the vessel, thus realizing the liquid level indication. Liquid level indication.Local display and remote control are possible. When used for remote control, the magnets and sensors (reed switches) in the float act to change the number of components (such as fixed-value resistors) connected in series into the circuit, which in turn changes the electrical quantity of the meter circuit system. In other words, the change in the position of the magnetic float causes a change in the electrical quantity.The change in electrical quantity is detected to reflect the liquid level in the vessel. It can directly output resistance value signals, or cooperate with the use of the transmission module, output current value (4 ~ 20mA) signals; at the same time with other converters, output voltage signals or switch signals. This enables remote transmission, analysis and control of electrical signals.Magnetic Flip Flop Level Gauge has direct reading feature with in situ display. There is no need to combine multiple level meters.Because of the magnetic coupling isolator closed structure. Especially suitable for flammable, explosive and corrosive toxic liquid level detection. So that the original complex environment of the liquid level detection means to become simple and reliable security.According to the different installation positions, there are side-mounted magnetic flap level gauge, top-mounted liquid level meter.Scope of application:Widely used in petroleum processing, food processing, chemical industry, activated carbon dosage device, lime dosage system, potassium permanganate dosage equipment, dosing equipment, pharmaceutical, electric power, papermaking, metallurgy, ships and boilers and other fields of liquid level measurement, control and monitoring.Advantages: Magnetic float level meter can achieve high sealing, anti-leakage and suitable for high temperature, high pressure, corrosion-resistant occasions. For high temperature, high pressure, poisonous, harmful, strong corrosive media to show its superiority.