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Level gauges are commonly used in industrial production to measure the height of a liquid or the volume of a liquid in a container. The daily inspection of liquid level meter is very important to ensure the accuracy and reliability of the liquid level meter, as well as timely detection and resolution of potential failure problems. In this article, we will introduce the contents and methods of daily inspection of liquid level meter.I. Appearance checkAppearance check of the level meter is mainly to check whether the external parts of the level meter are intact, including the level meter body, connecting pipelines, valves and sensors. First of all, check whether there is obvious damage or breakage of the level meter body, such as cracks, scratches, etc.. Secondly, check the tightness of the connecting piping to ensure that there is no air leakage at the connection. Finally, check whether the valves and sensors are working properly, such as whether the opening and closing are flexible and whether there is abnormal sound, etc.II. liquid level measurementThe core function of the liquid level meter is to measure the height of the liquid or the volume of the liquid in the container. Therefore one of the focuses of daily inspection of the liquid level meter is to carry out liquid level measurement. First, check whether the measurement range of the level meter matches the actual demand, such as whether it can measure the highest and lowest level of the liquid. Secondly, carry out level measurements, observe whether the measurement results are accurate and stable and compare them with the actual liquid level.III. Power-on inspectionThe level meter usually needs to be connected to the power supply to work normally, therefore, the power-on check is one of the important parts of the daily check of the level meter. First of all, check whether the power cord is intact and free from breakage and damage. Secondly, turn on the power and observe whether the level meter starts normally and whether the display shows the level information normally. At the same time, you also need to check whether the alarm system of the liquid level meter is working normally, such as alarm indicator, sound alarm and so on whether it can send out alarm signals normally.IV. Cleaning and maintenanceThe daily inspection of the liquid level meter also includes cleaning and maintenance work. First, the external surface of the level meter is cleaned regularly to ensure that there is no dust and debris attached. Second, clean the measuring parts of the level meter to remove dirt and deposits that may affect measurement accuracy. When cleaning, care should be taken to use appropriate cleaning agents and tools to avoid damage to the level meter. In addition, regularly check the sealing performance of the level meter, such as whether the waterproof seal is intact, to ensure the normal operation of the level meter in a humid environment.V. Record and analyzeThe last step in the daily inspection of the level meter is to record and analyze the inspection results. The date, time, inspection content and results of each inspection should be recorded for subsequent analysis and comparison. At the same time, you can also compare and analyze the results of multiple inspections to understand the level meter's working status and performance changes, and timely detection and resolution of potential faults.The daily inspection of liquid level meter includes appearance inspection, liquid level measurement, power-on inspection, cleaning and maintenance, as well as recording and analysis. Through regular daily inspection of the liquid level meter, it can ensure the normal operation and accurate measurement of the liquid level meter, and improve the production efficiency and product quality. At the same time, it can also timely find and solve the problem of liquid level meter failure, to avoid production interruption or other safety hazards caused by failure. Therefore, the daily inspection of liquid level meter is very important and should be given enough attention and concern.

I. Installation of mass flow meters1. Mass flow meter is through the vibration of the sensor to achieve the measurement, in order to prevent external interference, the instrument installation site can not have a large source of vibration, and take reinforcement measures to stabilize the instrument near the pipeline.2. Mass flow meter work to use the excitation of the magnetic field, so it can not be installed in large transformers, motors, pumps and other equipment to produce a large magnetic field near, at least and they have to maintain a distance of 0.6 ~ 1.0m or more, in order to avoid interference.3. Mass flow meter sensor and pipeline connection should not be stress (mainly torque), for this reason, the sensor should be in a free state coal connected to the pipeline has been well supported.4 straight pipe mass flow meter is best installed vertically, so that the instrument can be deactivated to make the measurement of pipeline emptying, so as to avoid scaling, if installed horizontally, it is necessary to two measurement pipe at the same level.5. Bend flowmeter horizontal installation, if the measurement of liquid, the shell should be facing down to avoid the accumulation of gas in the measurement tube, if the measurement of gas, the shell should be facing up to avoid the accumulation of condensate measurement tube.6. Sensor and transmitter connection cable should be specified in the manual, because the transmitter accepts low-level signals, so it can not be too long, and should use the thermal mass flow meter manufacturer's special cable.II. Routine maintenance of the mass flow meter1. Zero check and adjustment.Check every two to three months, in the case of production allows, the installation of important monitoring points in the quality of the flowmeter, the zero check time should be appropriately shortened zero drift value is large, should first check the cause, to be ruled out, and then zero point adjustment.2. Flowmeter sealing performance inspection and maintenanceFlowmeter in corrosive gases, humidity or dusty environment, we should always pay attention to check the sensor junction seal intact, in order to prevent corrosion of the terminals, resulting in the instrument can not operate normally!3. Check the working parametersa. Often pay attention to whether the set operating parameters have changed, the display of the flow rate, density, temperature value is normalb. When the flow meter is running, pay attention to check the pressure difference before and after the flow meter.c. Check the flow transmitter menu at any time whether the working parameters are normal4. Regularly observe the flowmeter fault indication.According to the type of flowmeter, specifications, thermal mass flow meter manufacturers of different fault display and content are different, the different fault alarm instructions, you can check the product manual to determine the cause of the failure, processing.5. Flowmeter cycle calibration.Flowmeter use for a period of time, according to the requirements of the periodic calibration, in order to determine the performance of the flowmeter, according to the quality of the flowmeter national calibration procedures, the quality of the flowmeter calibration cycle according to the use of the situation is determined6. flowmeter visual inspectionCheck the meter indication, whether the cumulative value is consistent, sweep away the dust and dirt, instrumentation, electrical junction box and component box sealing is good, flowmeter line with or without damage and corrosion, flowmeter meter body and connectors with or without damage and corrosion, check the flowmeter and the process piping connection with or without leakage, check the heat preservation and accompanying heat with or without damage.III. Mass Flow Meter Common Failureshardware failureThis kind of failure is more harmful, and not easy to judge, it is more complicated to deal with.a. Installation is not standardized: non-standard installation can directly lead to zero drift of the flowmeter, bringing measurement error; if the installation error is the flowmeter can not work. b. Wiring problems: when the wiring is wrong, the transmitter can not work.b. Wiring problems: wiring errors when the transmitter can not work. If the wiring is not serious, resulting in coil circuit resistance value is too large or too small, the lesser brought about by the measurement error, the heavier the transmitter can not work.c. Changes in the process medium: If the measurement medium appears to be trapped gas, gasification or two-phase flow and other phenomena, the transmitter will send out an alarm; serious transmitter stop working.d. Transmitter failure: a part of the transmitter device failure may lead to transmitter zero drift over the limit to bring the measurement error; or a part of the device failure, resulting in transmitter failure can not work; or some kind of functional failure of the transmitter. This type of failure can be simply judged by replacing the transmitter.e. Sensor failure: sensor measurement tube if leakage, the measurement medium will be filled with the case leading to the measurement tube vibration damping increases, the transmitter drive voltage soars; or the medium temperature is too high, damage to the measurement tube on the coil, resulting in drive, detection voltage imbalance. This type of failure is the most difficult to judge, because it rarely occurs, and the transmitter does not correspond to the alarm information, can only be based on experience and a combination of factors to determine.software failurea. Wrong parameter settings: incorrect flow and density coefficients are bound to cause measurement errors; if the coefficient of difference is too large, the transmitter alarm and stop working.b. Zero calibration error: flowmeter installation (including new installation and removal and reinstallation) must be strictly in accordance with the requirements of the zero calibration, otherwise it will cause errors; long-term operation of the flowmeter has not been disassembled should also be zero calibration on a regular basis in order to eliminate the cumulative effect of the installation of stress. Special attention should be paid to, if there is a flow of zero calibration, it is possible to destroy some of the memory parameters. c. I / O configuration error: I / O (input / output) is wrong, the flowmeter system can work normally, but the secondary table is displayed abnormally. If the output adopts frequency signal, the pulse equivalent of both ends should be the same; if RS-485 communication is used, the communication protocol should be ensured.

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 meter uses 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 customized 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.