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1.Changing the thermophysical properties of gases: Changes in fluid temperature can alter the thermophysical properties of gases, such as thermal conductivity and specific heat capacity. Generally speaking, as the temperature increases, the thermal conductivity of the gas increases, and the specific heat capacity also changes. This means that under the same heating power, the ability of gas to absorb and transfer heat changes. According to the working principle of a thermal gas mass flowmeter, changes in the thermal physical properties of the gas can cause changes in the temperature difference detected by the sensor, which in turn affects the mass flow rate results calculated based on the temperature difference. For example, when the gas temperature is higher than the calibration temperature, due to the increase in thermal conductivity, the speed at which the gas carries away heat increases, and the temperature difference detected by the sensor will decrease. If the calculation model under the calibration temperature is still followed, it will result in a smaller measured mass flow rate value. 2.Impact on sensor performance: The sensor of a thermal gas mass flowmeter usually has a certain adaptability range to temperature. When the fluid temperature exceeds this range, the performance of the sensor may be affected. On the one hand, excessive temperature may accelerate the aging and even damage of the heating element of the sensor, leading to unstable heating power and affecting measurement accuracy. On the other hand, temperature changes may cause changes in the sensitivity of temperature sensors. For example, in low-temperature environments, the response speed of temperature sensors may slow down, making it difficult to detect changes in gas temperature in a timely and accurate manner, resulting in measurement errors. 3.Causing thermal expansion of pipelines: Large diameter pipelines undergo thermal expansion or contraction when temperature changes. This may change the flow state of gas inside the pipeline, such as causing local deformation of the pipeline, resulting in uneven airflow distribution, or causing slight changes in the installation position of the flow meter, affecting the accurate measurement of gas flow rate by the sensor. In addition, thermal expansion of pipelines may also subject flow meters to additional stress, affecting their internal structure and the normal operation of sensors, ultimately leading to a decrease in measurement accuracy. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1.The correlation between impeller rotation and flow velocity: When the measured fluid flows through the turbine flowmeter, the force of the fluid causes the impeller to rotate. According to the principles of fluid mechanics, under certain conditions, the rotational speed of the impeller is directly proportional to the average flow velocity of the fluid in the pipeline. This is because the faster the fluid velocity, the greater the pushing effect on the impeller, resulting in faster rotation of the impeller. 2.Electromagnetic induction generates pulse signals: magnetic propeller blades are installed on the impeller, and electromagnetic induction devices, including permanent magnets and induction coils, are installed on the casing of the flowmeter. When the impeller rotates, the blades periodically cut the magnetic field lines generated by the permanent magnet, causing the magnetic flux in the induction coil to undergo periodic changes. According to the law of electromagnetic induction, changes in magnetic flux will induce pulsating electric potential signals in the coil, known as electrical pulse signals. 3.The relationship between flow rate and pulse signal frequency: Through theoretical analysis and experimental verification, the frequency of the electrical pulse signal is directly proportional to the flow rate of the measured fluid. Therefore, by measuring the frequency of the electrical pulse signal, the flow rate of the measured fluid can be calculated. Usually, in the design and calibration process of turbine flow meters, an accurate proportional coefficient is determined to convert the pulse frequency into the actual flow rate value, thereby achieving precise measurement of fluid flow rate. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1.0.1 level: indicates that the maximum allowable error of the pressure transmitter is ± 0.1% of the full range. For example, a 0.1 level pressure transmitter with a full range of 10MPa has a measurement error within ± 0.01MPa. This is a higher level of accuracy, typically used in applications that require extremely high precision in pressure measurement, such as aerospace, precision instrument manufacturing, and other fields. 2.Level 0.2: The maximum allowable error is ± 0.2% of the full scale. It is common in industrial automation control systems, laboratory measurements, and other scenarios that require high precision. For example, in the high-precision pressure control process of the pharmaceutical industry, pressure transmitters up to level 0.2 may be used to ensure precise control of pressure parameters during drug production. 3.Level 0.5: The maximum allowable error is ± 0.5% of the full scale. This is a commonly used precision level in industrial production, which can meet most general precision requirements for pressure measurement occasions. For example, in general pipeline pressure measurement in chemical production, pressure monitoring in water treatment systems, etc., a 0.5-level pressure transmitter can provide more accurate measurement results and has a high cost-effectiveness. 4.Level 1.0: The maximum allowable error is ± 1.0% of the full scale. Suitable for situations where pressure measurement accuracy is not particularly strict, such as pressure monitoring of some ordinary industrial equipment, air pressure monitoring in construction, etc. Although the accuracy is relatively low, the cost is relatively low and the economy is good while meeting the measurement requirements. There are also some other precision levels of pressure transmitters, such as 0.05 level and higher precision products, which are generally used in special high-precision measurement fields; And products with slightly lower accuracy such as 1.5 and 2.0 are used for some simple measurement scenarios that do not require high accuracy.

1.Accuracy level classification ①Common accuracy levels: generally including 0.1 level, 0.2 level, 0.5 level, 1.0 level, 1.5 level, 2.0 level, etc. For example, an electromagnetic flowmeter with a precision of 0.5 indicates a measurement error within ± 0.5%. ②High precision level: Some high-precision electromagnetic flow meters can achieve a precision of 0.1 or even higher, mainly used in applications that require extremely high flow measurement accuracy, such as scientific research experiments, high-precision chemical production processes, etc. ③Ordinary accuracy level: Electromagnetic flow meters with an accuracy level of 1.0 or below are suitable for some industrial applications and general civilian fields where accuracy requirements are not particularly strict, such as ordinary water supply and drainage systems, general industrial fluid transportation, etc. 2.Classification basis ①Measurement error: This is the main basis for the classification of accuracy levels. Measurement error refers to the difference between the measured value of a flowmeter and the actual flow rate value, usually expressed as a percentage of the actual flow rate. For example, the accuracy level of a certain electromagnetic flowmeter is 0.5, which means that under the specified working conditions, its measurement error does not exceed ± 0.5% of the actual flow rate. ②Repeatability: Repeatability refers to the degree of consistency in measurement results when multiple measurements of the same flow rate are taken under the same measurement conditions. A flow meter with good repeatability has low dispersion of measurement results and relatively high accuracy level. Generally speaking, high-precision electromagnetic flow meters require repeatability errors within ± 0.1% - ± 0.2%. ③Linearity: Linearity refers to the degree to which the measurement characteristic curve of a flowmeter is close to an ideal straight line. An electromagnetic flowmeter with good linearity has a closer linear relationship between the measured value and the actual flow rate, which facilitates accurate measurement and calibration. High precision electromagnetic flow meters typically require a linearity error within ± 0.2% - ± 0.5%. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

Generally speaking, the measurement accuracy of ordinary industrial thermal flow meters can reach ± 1% to ± 3% FS (full range). For example, in some industrial applications where flow measurement accuracy is not extremely high, such as general gas pipeline flow measurement, the accuracy of the thermal flowmeter used may be around ± 2% FS. For high-precision thermal flow meters, after careful design, manufacturing, and calibration, their measurement accuracy can reach ± 0.5% FS or even higher. This type of high-precision thermal flowmeter is usually applied in fields that require extremely strict flow measurement accuracy, such as scientific research experiments, high-end medical equipment, etc. For example, in some scientific research experiments, precise measurement of small flow rates of gases or liquids is required, and high-precision thermal flow meters can meet their demanding requirements for accuracy. In addition, some thermal flow meters can achieve higher measurement accuracy within specific flow ranges or for specific fluids through optimization design and algorithm compensation. However, in practical applications, due to various factors such as changes in fluid characteristics, limitations in installation conditions, and environmental factors, the actual measurement accuracy of the flowmeter may slightly decrease. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

The accuracy levels of oxygen pressure gauges usually include 1.0, 1.6, 2.5, etc. Oxygen pressure gauges with different accuracy levels are suitable for the following different scenarios: 1.1.0 level high-precision oxygen pressure gauge Applicable scenarios: Mainly used in situations where high precision is required for oxygen pressure measurement, such as aerospace, scientific research laboratories, high-end medical equipment, and other fields. In aerospace, high-precision pressure gauges are required for monitoring the pressure of aircraft oxygen systems to ensure the safety of astronauts and the smooth progress of flight missions; In scientific research laboratories, when conducting precise experiments related to oxygen, a 1.0 level precision oxygen pressure gauge can provide accurate data support; In high-end medical equipment, such as advanced ventilators and hyperbaric oxygen chambers, precise control of oxygen pressure is required to ensure the effectiveness and safety of patient treatment. 2.1.6 level medium precision oxygen pressure gauge Applicable scenarios: Suitable for most industrial production and general medical facilities. In industrial fields such as chemical, steel, and power industries, pressure monitoring is used for oxygen production, storage, and transportation processes, which can meet the general accuracy requirements for oxygen pressure measurement and ensure the safety and stability of the production process; In general medical settings, such as wards and operating rooms in ordinary hospitals, pressure monitoring of oxygen supply systems is used. A 1.6-level precision oxygen pressure gauge can provide patients with safe and stable oxygen supply. 3.2.5 level lower precision oxygen pressure gauge Applicable scenarios: Usually used in simple situations where the accuracy of oxygen pressure measurement is not high, such as small oxygen filling stations, industrial auxiliary systems with relatively relaxed oxygen pressure requirements, etc. In small oxygen filling stations, the main purpose is to roughly control the oxygen filling pressure, and a 2.5-level precision oxygen pressure gauge can meet basic filling requirements; In some industrial auxiliary systems, such as for processes such as blowing and displacement that do not require strict oxygen pressure, using a 2.5-level precision oxygen pressure gauge can reduce costs while also meeting the basic needs of the process. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1.Petrochemical industry ①Used to measure the flow rate of various petroleum products such as crude oil, gasoline, diesel, etc., accurately measure the transportation volume of oil products for trade settlement and production process control. ②Monitoring the flow rate of chemical raw materials such as ethylene, propylene, benzene, toluene, etc. helps to accurately control the feed rate of chemical reactions, ensuring product quality and production safety. 2.Power industry ①Measure the air flow required during the power generation process, optimize the combustion process, improve combustion efficiency, reduce energy consumption and pollutant emissions. ②Monitor steam flow for power generation calculation and steam system operation management, ensuring the rational allocation and utilization of steam. 3.Metallurgical Industry ①Accurate measurement of the flow rate of industrial gases such as oxygen, nitrogen, and argon is carried out in the production processes of ironmaking and steelmaking to meet process requirements and improve product quality. ②Measure the flow rate of gases such as blast furnace gas and coke oven gas to achieve reasonable energy measurement and utilization, and reduce production costs. 4.Pharmaceutical industry ①Accurately control and measure the flow rate of various fluids in the pharmaceutical process, such as raw materials, solvents, injection water, etc., to ensure the quality stability and consistency of drug production. ②Used for flow monitoring of clean air, nitrogen and other gases to ensure the cleanliness and stability of the pharmaceutical production environment. 5.Food and Beverage Industry ①Measure the flow rate of various liquid raw materials, such as milk, juice, syrup, etc., to achieve precise ingredients and ensure the stability of product taste and quality. ②Control the flow rate of gases such as carbon dioxide and nitrogen for processes such as carbonation and packaging protection of beverages. 6.Water Treatment Industry ①Monitor the water flow rate of different water qualities such as raw water, clean water, and sewage to help optimize water treatment processes, control dosage and operating parameters of treatment equipment. ②Measure the air flow rate during the aeration process to ensure the dissolved oxygen content in the water, promote the growth and metabolism of microorganisms, and improve the effectiveness of sewage treatment. 7.Building heating and cooling industry ①Measure the flow rate of hot and cold water in heating and cooling systems to achieve accurate measurement of heat and cooling capacity, facilitating energy billing and system operation adjustment. ②Monitor the airflow in the air conditioning system to ensure indoor air quality and comfort. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1.General industrial applications: For most electromagnetic flow meters used in conventional industrial environments, measuring media are general fluids, and the frequency of use is not particularly high, the calibration cycle can be set to 1-2 years. For example, in some chemical production processes, electromagnetic flow meters used to measure the flow rate of media such as water and general corrosive liquids can be calibrated every 1-2 years if their operating conditions are stable. 2.Harsh environments or critical applications: If the electromagnetic flowmeter is installed in harsh environments such as high temperature, high pressure, strong corrosion, high wear, or used in critical processes that require extremely high flow measurement accuracy, the calibration cycle may need to be shortened to six months or even shorter. For example, electromagnetic flow meters used in the petrochemical industry to measure the flow rate of high-temperature, high-pressure, and high viscosity crude oil, or in the pharmaceutical industry to precisely control the flow rate of raw materials, may need to be calibrated every six months to ensure measurement accuracy and reliability. 3.Frequent use of flow meters: For electromagnetic flow meters that are frequently used and have significant changes in flow rate, it is recommended to calibrate them once a year. For example, in some public utility fields, such as urban water supply systems, electromagnetic flow meters used to measure large amounts of water flow, due to their long-term operation and constantly changing flow rates, can be calibrated once a year to promptly detect and correct possible measurement errors. 4.Reliable quality flow meters: Some well-known brands of electromagnetic flow meters with reliable quality and high stability can have relatively longer calibration cycles under normal use conditions. For some flow meters with unstable quality or without long-term validation, more frequent calibration may be required to ensure their measurement accuracy. Enterprises should develop a reasonable calibration cycle based on the actual situation, comprehensively consider the above factors, and regularly calibrate and maintain electromagnetic flow meters to ensure their measurement accuracy and reliability. At the same time, when there are abnormal situations or doubts about the measurement results of the flowmeter, calibration and inspection should be carried out in a timely manner. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

The accuracy level of pressure transmitters is classified based on their maximum allowable error, and the following are common classification criteria: 1.Level 0.1 : indicates that the maximum allowable error of the transmitter is ± 0.1% of the full range. For example, a 0.1 level pressure transmitter with a full range of 10MPa has a maximum error of no more than ± 0.01MPa. 2.Level 0.2: The maximum allowable error is ± 0.2% of the full scale. For the above 10MPa full-scale transmitter, the error shall not exceed ± 0.02MPa. 3.Level 0.5: The maximum allowable error is ± 0.5% of the full range, which means that the error is within ± 0.05MPa when the full range is 10MPa. 4.Level 1.0: The maximum allowable error is ± 1.0% of the full scale, corresponding to a full scale of 10MPa, with an error not exceeding ± 0.1MPa. 5.Level 1.5: The maximum allowable error is ± 1.5% of the full scale. At a full scale of 10MPa, the error range is ± 0.15MPa.   The smaller the value of the accuracy level, the higher the measurement accuracy of the transmitter, and the relatively higher the price. In practical applications, the appropriate accuracy level of pressure transmitters should be selected based on specific measurement requirements and budget. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

Installation 1.Installation environment selection: Dry, well ventilated, and non strong electromagnetic interference areas should be selected to avoid installation in high temperature, humid, or corrosive gas environments. At the same time, it should be easy for operators to observe, operate, and maintain. 2.Pipeline installation requirements ①Requirements for straight pipe section: The length of the upstream straight pipe section where the flowmeter is installed should be ≥ 20 times the pipe diameter, and the length of the downstream straight pipe section should be ≥ 5 times the pipe diameter to ensure a stable flow state of the fluid before entering the flowmeter. ②Installation direction: Ensure that the fluid flow direction is consistent with the arrow direction on the flowmeter housing, and do not install it upside down. ③Concentric installation: The flowmeter should be installed concentric with the pipeline to avoid measurement errors caused by eccentric installation. ④Avoid vibration: The flowmeter should be installed away from the vibration source. If it cannot be avoided, shock-absorbing measures should be taken, such as using shock-absorbing brackets or rubber hose connections. 3.Connection method: Choose the appropriate connection method based on the pipeline connection method and diameter size, such as flange connection, threaded connection, or clamp connection. Ensure good sealing during connection to prevent leakage. 4.Filter installation: In order to prevent impurities from entering the flowmeter and affecting measurement accuracy and service life, a suitable filter should be installed upstream of the flowmeter, with a filtration accuracy generally not less than 200 mesh. 5.Installation of bypass pipeline: Cut off valves should be installed upstream and downstream of the flowmeter, and a bypass pipeline should be set up to ensure that the normal operation of the pipeline system is not affected during maintenance or repair of the flowmeter. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

Here are some methods to determine whether an oxygen pressure gauge needs calibration: 1. Check calibration cycle : Refer to the user manual or relevant regulations of the oxygen pressure gauge. The usual calibration cycle is six months to one year. If the time since the last calibration has reached or exceeded the specified period, even if the pressure gauge appears to be working normally, calibration should still be performed to ensure measurement accuracy. 2.Observe the appearance of the pressure gauge: Check for damage, deformation, or corrosion of the case, dial, pointer, and other components. If the dial is stained, the scale is blurry, the pointer is bent, loose, or does not return to zero, it may affect the measurement accuracy and requires calibration. 3.Comparing multiple pressure gauge readings: In the same oxygen system, if there are multiple pressure gauges measuring the same part of the pressure, their readings can be compared. If the reading difference exceeds the allowable error range, the relevant pressure gauge needs to be calibrated. 4.Comparison with standard pressure source: Use a high-precision standard pressure source, such as a piston pressure gauge, to compare and measure with an oxygen pressure gauge. Compare the pressure value output by the standard pressure source with the indicated value of the oxygen pressure gauge. If the error exceeds the accuracy level requirement of the pressure gauge, calibration is required. 5.According to the production process requirements, if the production process requires high accuracy in oxygen pressure, such as in some chemical production processes, even if the pressure gauge reading appears normal, regular calibration should be carried out to ensure the accuracy of process parameters and the stability of product quality. When there is an abnormality in the process and it is suspected to be related to inaccurate oxygen pressure measurement, the pressure gauge should also be calibrated in a timely manner. 6.Judgment after experiencing special circumstances: When the oxygen pressure gauge experiences severe vibration, sudden temperature changes, overload, or other situations that may affect its performance, such as equipment handling, pipeline bursting, etc., even if there is no obvious damage to the appearance, it should be calibrated to confirm whether its measurement accuracy is affected. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1.Oil and gas industry ①Natural gas transportation measurement: In the long-distance transportation of natural gas, precise measurement of flow rate is required for trade settlement. Gas turbine flow meters can accurately measure the volumetric flow rate of natural gas, providing accurate measurement data for both supply and demand sides, ensuring fair and just transactions. For example, in large-scale natural gas transmission projects such as the West East Gas Pipeline, gas turbine flow meters are widely used in various metering stations. ②Measurement of associated gas in oil fields: During the process of oil extraction, a large amount of associated gas is generated. Accurately measuring associated gas is helpful for the rational utilization of this resource and can also provide data support for oilfield production management. Gas turbine flowmeter can adapt to the complex working conditions of associated gas in oil fields and achieve accurate measurement. 2.Chemical industry ①Chemical raw gas metering: In chemical production, many chemical reactions require precise control of the flow rate of raw gas to ensure the smooth progress of the reaction and stable product quality. Gas turbine flow meters can quickly and accurately measure the flow rate of various chemical raw gases, such as hydrogen, nitrogen, chlorine, etc., providing precise flow control for chemical production processes. ②Process gas monitoring: In chemical processes, real-time monitoring of the flow rate of various gases is required to adjust process parameters in a timely manner, ensuring production safety and product quality. Gas turbine flow meters can be installed at different process nodes to monitor real-time changes in gas flow rate, providing reliable data for the automation control of chemical production. 3.Power industry ①Gas turbine intake metering: Gas turbines are important equipment in power plants, and accurate measurement of their intake flow rate is crucial for optimizing the performance and operating efficiency of the unit. Gas turbine flow meters can accurately measure the intake flow rate of gas turbines, helping operators adjust fuel supply and combustion parameters according to actual operating conditions, improve the power generation efficiency of gas turbines, and reduce energy consumption. ②Auxiliary system gas metering: The auxiliary systems of power plants, such as air compressors, hydrogen production systems, etc., also require precise measurement and control of gas flow. Gas turbine flow meters can provide accurate flow data for these auxiliary systems, ensuring the stable operation of the system. 4.Metallurgical Industry ①Measurement of blast furnace gas: Blast furnace gas is an important secondary energy source for metallurgical enterprises, and accurate measurement is of great significance for energy management and cost accounting. Gas turbine flowmeter can adapt to complex working conditions such as dust and humidity in blast furnace gas, accurately measure gas flow rate, and provide data support for energy balance and energy conservation and emission reduction in metallurgical enterprises. ②Measurement of industrial gases such as oxygen and nitrogen: In metallurgical production processes, industrial gases such as oxygen and nitrogen are widely used in processes such as steelmaking and steel rolling. Gas turbine flow meters can accurately measure the flow rate of these gases, achieve precise gas supply control, and improve production efficiency and product quality. 5.Pharmaceutical industry ①Clean gas metering: In the pharmaceutical production process, a large amount of clean gas, such as compressed air, nitrogen, etc., is required for packaging, transportation, and process protection of drugs. Gas turbine flow meters can accurately measure the flow rate of clean gases, ensuring that the gas supply during drug production meets GMP (Good Manufacturing Practice) requirements and guaranteeing drug quality and safety. ②Process gas metering: In some pharmaceutical synthesis reactions, precise control of the flow rate of reaction gases is required to ensure the accuracy and repeatability of the reaction. Gas turbine flow meters can provide high-precision gas flow measurement for pharmaceutical processes, helping to improve the consistency and stability of drug production. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. High accuracy: It can measure liquid level accurately, with a general accuracy of ± 10mm or even higher, meeting the measurement needs of most industrial occasions. 2. Strong reliability: Using the principle of magnetic coupling for liquid level measurement, there is no complex electronic component in contact with the measured medium, reducing the possibility of measurement failure due to electronic component failure, and ensuring stable and reliable operation. 3. Long service life: The structure is simple, and the parts in contact with the medium are mostly made of corrosion-resistant materials. As long as they are used and maintained properly, the service life of the magnetic flap level gauge is long. 4. Good compatibility: It can output multiple standard signals, such as 4-20mA current signals, HART protocol signals, etc., making it easy to be compatible with various automation control systems and achieve remote monitoring and data acquisition.We specialize in producing electromagnetic flowmeter, vortex street flowmeter, turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.  

1. Range ratio ① The vortex precession flowmeter: Generally, the range ratio can reach 10:1, and some intelligent  vortex precession flowmeters can reach a range ratio of 15:1 or even 30:1. ② Vortex street flowmeter: The typical range ratio is 10:1, and some high-performance vortex street flowmeters can achieve a range ratio of 100:1. 2. Measurement range ① The vortex precession flowmeter: suitable for flow measurement in small-diameter pipelines (usually with diameters below 150mm). Taking the JKLUX series  vortex precession flowmeter as an example, the flow range of DN20 is 1.2-1.5m ³/h, DN25 is 2.5-30m ³/h, DN50 type A is 10-150m ³/h, and type B is 6-75m ³/h. ② Vortex street flowmeter: suitable for flow measurement of large caliber and high flow velocity. The common full tube vortex street flowmeter has a diameter range of DN25-DN300, while the insertion vortex street flowmeter has an inner diameter range of 350-1200mm. Taking a certain vortex street flowmeter as an example, DN20 measures liquid flow rates ranging from 0.8-10m ³/h and gas flow rates ranging from 5-40m ³/h; The DN200 measures a liquid flow rate range of 90-900m ³/h and a gas flow rate range of 480-4000m ³/h. 3. Effects of Applicable Media ①The vortex precession flowmeter: mainly used for measuring gas flow rate. When measuring gas, its range has certain limitations at different diameters, and it can also adapt well to small flow gas measurement. ② Vortex street flowmeter: capable of measuring various media such as gas, liquid, steam, etc. For liquids, there may be measurement accuracy issues at low flow rates, while for gases and vapors, their range can cover a wide range. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.  

The accuracy of vortex flowmeter and vortex street flowmeter is affected by various factors. Generally speaking, it is not easy to determine which one has higher accuracy. The following is a specific situation analysis: 1.The vortex precession flowmeter : The general accuracy level can reach ± 1.0% FS and ± 1.5% FS. Some high-performance the vortex precession flowmeter s can achieve a liquid accuracy of up to ± 0.5%. 2.Vortex street flowmeter: The common measurement accuracy is generally ± 1.0 level, ± 1.5 level, and ± 2.5 level. Some high-performance vortex street flowmeters can achieve an accuracy of ± 0.5% of the measured value. In practical applications, the accuracy of the two flow meters will also be affected by the following factors: 1.Fluid characteristics: For the vortex precession flowmeters, changes in fluid viscosity, density, and other factors have a relatively small impact on their accuracy, making them suitable for fluid media with high viscosity, high solid content, and high gas content. Vortex street flowmeter can generally work normally when measuring fluids containing impurities, dust, and particulate matter, but at low flow rates, it is greatly affected by fluid characteristics and the measurement accuracy will be reduced. 2.Installation conditions: The vortex precession flowmeter  requires a relatively short straight pipe section, generally 3D in the front and 1D in the back (D is the pipe diameter). Vortex street  flowmeters usually require a certain length of upstream and downstream straight pipe sections to ensure stable fluid flow. If the installation does not meet the requirements, the measurement accuracy of both will be affected. 3.Environmental factors: Strong electromagnetic interference, vibration, and other environmental factors may cause certain interference to the vortex precession flowmeter , affecting its accuracy. The  vortex street  flowmeter adopts a new type of signal processing amplifier and unique filtering technology, which can effectively eliminate interference signals caused by pressure fluctuations and pipeline vibrations to a certain extent. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. Characteristics of the medium ① Conductivity: Plug in electromagnetic flow meters generally require the conductivity of the measured medium to be greater than 5 μ s/cm. ② Corrosivity: Select appropriate electrode and lining materials based on the corrosiveness of the medium. For measuring neutral solutions such as industrial and domestic water, 316L stainless steel electrodes can be used; Measuring highly corrosive acid, alkali, and salt solutions may require electrode materials such as Hastelloy and tantalum. In terms of lining materials, chloroprene rubber is suitable for corrosive environments with low concentrations of acid, alkali, and salt, while polytetrafluoroethylene can resist corrosion from almost all chemical media. ③ Temperature and pressure: Ensure that the rated temperature and pressure range of the flowmeter can meet the working temperature and pressure requirements of the medium. For example, the working temperature of a flowmeter with ordinary rubber lining is generally between -20 ℃ and+60 ℃. If the medium temperature is high, high-temperature rubber lining or polytetrafluoroethylene lining can be selected. 2. Traffic parameters ① Flow range: Determine the maximum flow, minimum flow, and commonly used flow in actual use. Select the appropriate flow meter based on these flow values, so that the measurement range can cover the actual flow changes. Generally, a flow rate of 2-4m/s is more suitable. ② Pipeline diameter: If the pipeline size has been determined, select an inserted electromagnetic flowmeter that matches the pipeline diameter; If the pipeline size has not been determined yet, the appropriate pipeline diameter can be calculated based on the flow range, and then the corresponding flowmeter can be selected. 3. Installation conditions ① Environmental factors: It should be installed in a place far away from strong electromagnetic field equipment, without strong vibration, with securely fixed pipelines, and moderate environmental temperature changes. ② Requirements for straight pipe section: Generally, the length of the upstream straight pipe section of the sensor should be ≥ 20D, and the length of the downstream straight pipe section should be ≥ 7D to ensure stable fluid flow and improve measurement accuracy. ③ Installation method: Based on the actual situation on site, choose a plug-in electromagnetic flowmeter with or without a globe valve. The globe valve can be installed and disassembled without interruption, making it easy to maintain and repair. 4. Functional requirements ① Output signal: Select the appropriate output signal type based on the connection requirements with the control system or data acquisition system, such as 4-20mA current signal, pulse signal, digital communication signal, etc. ② Display function: If you need to directly observe flow data on site, you can choose a flow meter with on-site display function; If the main purpose is to transmit data to the control room for monitoring and control, economical products without on-site display can be selected. ③ Protection level: Select the protection level according to the requirements of the installation environment. If installed in places that are frequently flooded below ground level, a submersible type (IP68) should be selected; Generally, water spray resistant (IP65) is selected for installation on the ground. 5. Other factors ① Accuracy requirements: Select the accuracy level according to specific measurement needs, generally including 0.5 level, 1.0 level, 1.5 level, etc. ② Budget: The prices of plug-in electromagnetic flowmeters of different brands, specifications, and functions may vary. On the premise of meeting measurement needs, choose products with high cost-effectiveness based on the budget. ③ Brand and after-sales service: Choosing products from well-known brands usually results in more reliable quality and better after-sales service and technical support. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. Installation precautions ① Installation location a. The vertical installation position should be selected to ensure that the level gauge is perpendicular to the horizontal plane, with an inclination of no more than ± 5 °, to ensure that the float can move freely up and down in the main tube and accurately reflect changes in the liquid level. b. Keep away from the liquid inlet and outlet, as well as the agitator, to avoid the impact of liquid flow and the vortex generated by agitation from interfering with the float and affecting measurement accuracy. ② Connection method a. When using flange connections, it is necessary to ensure that the flange surface is flat and free of deformation, and that the bolt tightening force is uniform to prevent leakage and unstable installation. b. If a threaded connection is used, attention should be paid to the specification matching and sealing performance of the thread. Sealing tape or sealant can be used appropriately to ensure that there is no leakage at the connection. ③ Distance from other devices a. A certain distance, generally not less than 200mm, should be maintained between the liquid level gauge and adjacent equipment or obstacles for maintenance and repair operations. b. For level gauges with remote transmission devices, it is necessary to ensure that the length of the signal transmission line between the remote transmitter and the display instrument meets the requirements, generally not exceeding 100m, to avoid signal attenuation. ④ Float installation a. When installing the float, pay attention to the direction of the float, ensuring that its heavy end is downward and the light end is upward, so that the float can maintain the correct posture in the liquid and smoothly follow the rise and fall of the liquid level. b. Be careful during the installation process to avoid collision between the float and the main pipe, prevent damage to the float or affect the performance of its internal magnetic steel. ⑤ Heat tracing and insulation measures a. If the temperature of the measured medium is too low or too high, the level gauge needs to be heat traced or insulated. The heat tracing medium should be non-magnetic, such as hot water, steam, etc., to avoid affecting the magnetic system of the magnetic flap level gauge. b. The insulation material should be selected with appropriate material and thickness to ensure good insulation effect. At the same time, attention should be paid to the installation of the insulation layer not affecting the normal observation and maintenance of the liquid level gauge. 2. Maintenance precautions ① Regular inspection a. Regularly inspect the appearance of the liquid level gauge, check for corrosion, deformation, leakage, and other issues in the main tube, and ensure clear and accurate display on the flip plate. If there are any problems, promptly address them. b. Check the activity of the float to ensure that it can move freely up and down within the main tube without any obstruction. The float can be manually operated to observe whether it can drive the flipping plate to flip normally. ② Cleaning and maintenance a. Regularly clean the inner wall of the main tube and the surface of the float of the liquid level gauge to prevent dirt, impurities, etc. from adhering to it, which may affect the buoyancy and magnetic coupling effect of the float. When cleaning, use a soft damp cloth or specialized cleaning agent to avoid scratching with sharp tools. b. For the flip indicator, its surface should be kept clean to avoid dust and oil stains blocking the line of sight and affecting the observation of the liquid level. ③ Magnetic steel performance inspection a. Regularly check the magnetic strength of the magnetic steel inside the float and the flipping plate. If the magnetic strength weakens or disappears, the magnetic steel should be replaced in a timely manner to ensure the normal operation of the magnetic coupling. b. During use, it is necessary to avoid interference from strong magnetic fields on the level gauge and prevent demagnetization of the magnetic steel. ④ Remote transmission device maintenance a. For level gauges with remote transmitters, it is necessary to regularly check the working status of the transmitter, including whether the power supply is normal and whether the signal output is stable. b. Check whether the installation of the transmitter and the main pipe is firm, and whether the distance between the sensor and the float is appropriate. If there is any looseness or displacement, it should be adjusted in a timely manner. ⑤ Seal replacement a. Regularly inspect the sealing components of the liquid level gauge, such as sealing rings, gaskets, etc. If aging, damage, or leakage is found, they should be replaced in a timely manner to ensure good sealing of the liquid level gauge. b. When replacing seals, it is important to choose the appropriate material and specifications to ensure the sealing effect. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. Installation precautions ① Installation location a. Requirements for straight pipe section: To ensure measurement accuracy, there should be at least 10 times the diameter of the straight pipe section upstream of the flowmeter and at least 5 times the diameter of the straight pipe section downstream. If there are bends, valves, and other pipe fittings upstream, the length of the straight pipe section should be appropriately increased. b. Avoid vibration sources: Keep away from vibration equipment such as pumps and compressors. If unavoidable, vibration reduction measures should be taken, such as installing vibration pads or using flexible connecting pipes. c. Installation direction: Generally, horizontal installation is required, and in special cases, vertical or inclined installation can also be used, but it is necessary to ensure that the fluid is filled in the pipeline and the flow direction is consistent with the direction indicated by the flowmeter. d. Easy to maintain: The installation location should be easy for personnel to operate and maintain, with sufficient space around for easy disassembly and maintenance. ② Pipeline connection a. Sealing requirement: A sealing gasket should be used between the connecting pipeline and the flowmeter to ensure good sealing and prevent leakage. b. Concentricity: The axis of the pipeline and flowmeter should be kept concentric, and the deviation should not exceed the specified value, otherwise it will affect the measurement accuracy. c. Avoid stress: During installation, it is necessary to prevent pipeline stress from being transmitted to the flow meter. Flexible connections or compensators can be used on the pipeline. ③ Other precautions a. Filter installation: A filter must be installed upstream of the flowmeter, and the filtration accuracy should be determined according to the fluid medium and flowmeter requirements, generally not less than 200 mesh, to prevent impurities from entering the flowmeter and damaging the impeller. b. Exhaust device: For liquid measurement, an exhaust device should be installed upstream of the flowmeter to remove gas from the pipeline and avoid gas affecting measurement accuracy. c. Electrical connection: Wiring should be carried out according to the instructions to ensure that the wiring is firm and correct. Shielded wires should be reliably grounded to prevent electromagnetic interference. 2. Maintenance precautions ① Daily maintenance a. Appearance inspection: Regularly inspect the appearance of the flowmeter to check for leaks, damage, corrosion, and other issues. If there are any problems, they should be dealt with promptly. b. Monitoring of operating parameters: Pay attention to the operating parameters of the flowmeter, such as flow rate, pressure, temperature, etc., to ensure that it operates within the normal range. If abnormal fluctuations are found, the cause should be promptly investigated. c. Signal inspection: Check if the output signal of the flowmeter is normal, and if there are any issues such as signal interruption or interference, which can be detected using a signal tester. ② Regular maintenance a. Cleaning: Regularly clean the flowmeter according to the cleanliness of the fluid medium, usually every 3-6 months. Be careful when disassembling during cleaning to avoid damaging the impeller and other components. Rinse with clean solvent or water, and then air dry for assembly. b. Calibration: It is recommended to calibrate the flowmeter annually or periodically based on actual usage. It can be sent to a professional metrology institution for calibration to ensure measurement accuracy. c. Component replacement: Check the wear of vulnerable components such as impellers and bearings. If there is obvious wear or damage, they should be replaced in a timely manner to ensure the performance of the flowmeter. ③ Special case handling a. Fluid changes: When the measured fluid medium changes, such as viscosity, density, and other parameters, it may be necessary to recalibrate or adjust the parameters of the flowmeter. b. Fault repair: If the flowmeter malfunctions, such as impeller jamming, abnormal signal, etc., it should be stopped for repair in a timely manner. The maintenance personnel need to have professional knowledge and skills and operate according to the maintenance manual. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. No traffic output ① Power supply issues: Insufficient power supply voltage, power circuit board failure, blown fuses, etc. can cause abnormal power supply to the instrument. Connection issue: Cable damage, loose connection or poor contact, resulting in signal transmission failure. ② Media and installation issues: The pipeline is not filled with liquid, the direction of liquid flow does not meet the requirements of the instrument, and the sensor installation position is improper, all of which can prevent the instrument from measuring correctly. ③ Component damage: Sensor electrodes, excitation coils, and other components are damaged, or converter components are malfunctioning, making it impossible to generate or process flow signals. 2. Output numerical fluctuations ① External interference: Large electrical equipment and welding machines nearby generate strong magnetic fields, radio waves, and other electromagnetic interference, which affects signal transmission. ② Pipeline and liquid issues: The pipeline vibrates greatly, causing the flowmeter circuit board to loosen; There are bubbles in the liquid or the pipeline is not filled with liquid, resulting in unstable measurement. ③ Electrical connection issues: terminal oxidation and poor contact on the circuit board, resulting in unstable signal transmission. 3. Zero drift ① Sensor issues: Aging of internal coils, decreased insulation performance, or electrode contamination or corrosion, causing changes in measurement standards. ② Environmental and installation issues: significant temperature changes without effective compensation; Improper installation position, sensor not in sufficient contact with fluid or subject to external interference. ③ Liquid characteristic issues: Uneven liquid conductivity, presence of small flow, etc., affect the stability of the zero point. 4. Inaccurate measurement values ① Parameter setting issue: The parameter settings of the converter are incorrect, such as instrument constants, ranges, etc., resulting in measurement result deviation. ② Installation issue: The upstream flow condition of the sensor does not meet the requirements, such as insufficient length of the straight pipe section, or the distance between the flow blocking components such as the regulating valve and the sensor is too close. ③ Changes in medium properties: Changes in the density, viscosity, and other characteristics of the measured liquid can affect measurement accuracy. ④ Signal cable problem: The insulation performance of the signal cable decreases and is interfered with, causing distortion of the transmitted signal. 5. Instrument damage or alarm ① Header malfunction: The header does not light up when powered on and displays a yellow screen, which may be due to power issues, damaged fuse, or malfunction of the header itself. ② Excitation alarm: open circuit in excitation wiring, abnormal resistance in excitation coil, or converter failure. ③ Air traffic control alarm: The measurement tube is not filled with fluid, the fluid conductivity is low, the air traffic control threshold and range are set incorrectly, the signal connection is incorrect, or the electrode is faulty. ④ Upper or lower limit alarm: If the output current or frequency exceeds the set upper or lower limit value, it may be due to unreasonable process range setting or actual flow exceeding the range. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.

1. Industrial sector ① Petrochemical industry: In the process of petroleum refining, the flow rate of crude oil, refined oil, etc. can be measured to provide accurate data for production scheduling and measurement settlement. In chemical production, it is possible to measure the flow rate of various corrosive conductive liquids such as acid, alkali, salt solutions, and organic solutions, such as sulfuric acid, sodium hydroxide solutions, etc., to ensure accurate material ratios for chemical reactions and guarantee product quality. ② Metallurgical industry: used to measure the flow rate of cooling water in metallurgical production, to monitor the operating status of the cooling system and ensure the normal cooling of equipment. It can also measure the flow rate of acidic and alkaline solutions in processes such as acid washing and electroplating, which helps to control process parameters, improve product quality and production efficiency. ③ Textile industry: In the process of textile printing and dyeing, the flow rate of dyes, slurries and other fluids can be accurately measured to ensure the stability of dyeing and sizing processes, resulting in uniform color and stable quality of textiles. ④ Paper industry: It can measure the flow of pulp, white water, etc., help control the supply of pulp and water circulation in the paper making process, improve paper quality and production efficiency, and can also be used for flow monitoring of wastewater discharge, facilitating environmental management. 2. Environmental protection field ① Sewage treatment: In sewage treatment plants, the inflow, outflow, and sewage flow in each treatment process can be monitored to provide data support for the operation control and effectiveness evaluation of sewage treatment processes, ensuring that sewage is discharged in compliance with standards. It can also be used for flow monitoring of enterprise sewage discharge outlets, supervising the sewage discharge situation of enterprises, and preventing illegal discharge. ② River and Lake Monitoring: In water environment monitoring, it can be used to measure the flow of water bodies such as rivers and lakes, understand the flow of water resources, and provide important basis for water resource management, water ecological protection, flood control and disaster reduction. 3. Municipal field ① Urban water supply: In the urban water supply system, it is installed on the main pipeline or residential water supply pipeline to measure the flow rate of tap water, which facilitates water allocation, billing, and network operation management by the water supply department, ensuring the stability and efficiency of urban water supply. ② Heating system: In a centralized heating system, the flow rate of hot water can be measured, and the heating amount can be calculated based on temperature data to achieve accurate measurement and charging of heat. At the same time, it helps heating enterprises optimize heating scheduling and improve heating quality. 4. Food and pharmaceutical industry ① Food processing: In beverage production, it is possible to accurately measure the flow rate of raw materials such as juice, syrup, and water, achieve precise ingredients, and ensure consistency in product taste and quality. In dairy processing, the flow rate of fluids such as milk and yogurt can be measured for production process control and yield statistics. ② Pharmaceutical industry: In the process of drug production, the flow rate of drugs, purified water, etc. can be measured to ensure accurate and error free material addition during drug production, in compliance with Good Manufacturing Practice (GMP) requirements, and to ensure the stability and consistency of drug quality. 5. Water conservancy and hydropower field ① Water conservancy engineering: Installing split type electromagnetic flow meters in the discharge pipelines or irrigation channels of reservoirs and dams can measure the flow rate of water, providing accurate data for water resource allocation, irrigation water management, and flood control scheduling. ② Hydroelectric power station: used in the diversion or tailwater pipelines of hydroelectric power stations to measure water flow rate, in order to calculate power generation, evaluate unit operating efficiency, and carry out water conservancy scheduling. We specialize in producing electromagnetic flowmeter, vortex street flowmeter,  turbine flowmeter, thermal gas mass flowmeter, metal tube rotameter, orifice flowlmeter, ultrasonic flowmeter, verabar flowmeter, target type flowmeter, magnetic level indicator, differential pressure transmitter, etc.