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LF17-...4 Series Metal Rotameters
The LF17-... series of metal rotor flowmeters employs the variable-area measurement principle and is designed for continuous measurement of volumetric flow rates of liquids and gases in closed pipelines. These metal-tube float flowmeters feature a robust and reliable design, a wide operating temperature range, high accuracy, and an affordable price, making them suitable for flow measurement in various applications. This series comes in a smart on-site indicator version, available in three installation configurations: bottom-in-top-out, left-in-right-out, and bottom-in-side-out. They can be widely used in departments such as national defense, chemical industry, petroleum metallurgy, power generation, environmental protection, pharmaceuticals, and light industries for measuring liquid and gas flow rates. Key features of this product include:
● Resistant to Harsh Operating Conditions: Its metal construction—such as stainless steel—endows it with high-pressure and high-temperature resistance, making it suitable for corrosive or high-temperature media in industrial sectors like petroleum and chemical processing.
● Ideal for small to medium flow rates: Based on the float-up principle, it offers higher measurement accuracy for low flow velocities and media flowing through small to medium pipe diameters (typically DN15–DN200), making it especially suitable for applications with unstable flow conditions.
● Easy installation and maintenance: Can be installed vertically without needing to reserve long straight pipe sections like turbine flowmeters; features a simple design with no complex moving parts inside, resulting in low maintenance costs.
● Intuitive readings: Traditional models feature a transparent conical tube with scale markings, allowing direct observation of the float position to measure flow rate; the smart version, meanwhile, supports digital display, making data acquisition even more convenient.
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● Resistant to Harsh Operating Conditions: Its metal construction—such as stainless steel—endows it with high-pressure and high-temperature resistance, making it suitable for corrosive or high-temperature media in industrial sectors like petroleum and chemical processing.
● Ideal for small to medium flow rates: Based on the float-up principle, it offers higher measurement accuracy for low flow velocities and media flowing through small to medium pipe diameters (typically DN15–DN200), making it especially suitable for applications with unstable flow conditions.
● Easy installation and maintenance: Can be installed vertically without needing to reserve long straight pipe sections like turbine flowmeters; features a simple design with no complex moving parts inside, resulting in low maintenance costs.
● Intuitive readings: Traditional models feature a transparent conical tube with scale markings, allowing direct observation of the float position to measure flow rate; the smart version, meanwhile, supports digital display, making data acquisition even more convenient.
LF14 Series Electromagnetic Flowmeters
The LF14 series electromagnetic flowmeter consists of two main components: the sensor and the converter. It operates based on Faraday's law of electromagnetic induction, designed to measure the volumetric flow rate of conductive liquids—and is classified as a velocity-type instrument. In addition to measuring the volume flow of common conductive liquids, it can also be used to accurately determine the flow rates of highly corrosive fluids such as strong acids and strong bases, as well as uniform liquid-solid two-phase suspensions like mud, mineral slurries, and pulp. This product finds extensive applications in industries such as petroleum, chemical engineering, metallurgy, light textile, papermaking, environmental protection, and food processing, as well as in municipal management, water conservancy projects, and river dredging operations for flow measurement.
● Measurement is unaffected by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity.
● The measuring tube features no obstructive components, resulting in zero pressure loss and reduced requirements for straight pipe sections. It also exhibits unique adaptability for slurry measurement.
● Properly select electrode and lining materials that exhibit excellent corrosion resistance and wear resistance.
● Fully digital processing, strong anti-interference capability, reliable measurement, high accuracy, and a wide flow measurement range
● Ultra-low EMI switching power supply, suitable for a wide range of input voltage variations and featuring excellent EMI resistance.
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● Measurement is unaffected by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity.
● The measuring tube features no obstructive components, resulting in zero pressure loss and reduced requirements for straight pipe sections. It also exhibits unique adaptability for slurry measurement.
● Properly select electrode and lining materials that exhibit excellent corrosion resistance and wear resistance.
● Fully digital processing, strong anti-interference capability, reliable measurement, high accuracy, and a wide flow measurement range
● Ultra-low EMI switching power supply, suitable for a wide range of input voltage variations and featuring excellent EMI resistance.
LF-19P Series Nozzle Flow Meters
The LF-19P series nozzle flowmeter is a differential-pressure type flow measurement instrument based on the throttling principle. Its core component is a nozzle with a specially designed curved profile. By installing the nozzle directly into the pipeline, the flowing fluid creates a pressure difference as it passes through, allowing the flow rate to be accurately calculated. As the fluid flows through the nozzle, it gradually contracts at the inlet, causing the flow velocity to increase while the static pressure decreases. At the throat section immediately downstream of the nozzle outlet, the flow velocity reaches its maximum, and the static pressure drops to its lowest point. By measuring the pressure difference before and after the nozzle—and combining this data with fluid properties such as density and temperature—it becomes possible to determine the fluid’s instantaneous and cumulative flow rates using Bernoulli’s equation. The streamlined design of the nozzle minimizes turbulence at the throttling point, making the device less sensitive to solid particles in the medium and significantly enhancing its resistance to clogging. This makes it particularly well-suited for measuring fluids that are dirty or contain minor impurities. The product is widely used in industries such as power generation, chemical processing, and petroleum, especially for applications involving steam, gases, and high-viscosity liquids. Key features of this product include:
●Low pressure loss and excellent energy-saving performance: Compared to traditional orifice plates, the nozzle's streamlined design effectively minimizes vortex formation.
● Anti-clogging and wear-resistant with a robust structure: The internal design features no complex components, making the throttling edges highly resistant to wear. Its design prevents debris buildup, making it ideal for handling dirty media containing small particles—and ensuring an exceptionally long service life.
● High measurement accuracy and stable performance: Measurement accuracy typically ranges from ±0.5% to ±2% of full scale, with minimal impact from fluid viscosity and flow velocity fluctuations, ensuring consistent and reliable measurements across a wide flow range.
● Wide range of applicable conditions: It can measure various media such as liquids, gases, and steam, making it particularly suitable for high-temperature, high-pressure, and high-flow applications. It is widely used in industries like power generation, chemical processing, and petroleum.
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●Low pressure loss and excellent energy-saving performance: Compared to traditional orifice plates, the nozzle's streamlined design effectively minimizes vortex formation.
● Anti-clogging and wear-resistant with a robust structure: The internal design features no complex components, making the throttling edges highly resistant to wear. Its design prevents debris buildup, making it ideal for handling dirty media containing small particles—and ensuring an exceptionally long service life.
● High measurement accuracy and stable performance: Measurement accuracy typically ranges from ±0.5% to ±2% of full scale, with minimal impact from fluid viscosity and flow velocity fluctuations, ensuring consistent and reliable measurements across a wide flow range.
● Wide range of applicable conditions: It can measure various media such as liquids, gases, and steam, making it particularly suitable for high-temperature, high-pressure, and high-flow applications. It is widely used in industries like power generation, chemical processing, and petroleum.
The LF-19Q Venturi flowmeter is a differential-pressure-type flow measurement instrument designed based on Bernoulli's equation and the principle of fluid continuity. Its core structure consists of three main sections: an inlet contraction section, a central throat, and an outlet diffusion section. Due to its simple design and low energy consumption, it is widely used in industrial fluid measurement applications. This product features the following characteristics:
● Minimal pressure loss and excellent energy efficiency: The unique "contraction-throat-expansion" structure recovers approximately 90% of the static pressure energy.
● Anti-clogging and wear-resistant with strong adaptability: The inner wall features a smooth surface free of sharp edges or constricted dead zones, making it highly resistant to impurity buildup (such as particles in wastewater or deposits in steam). This design ensures stable performance even under challenging conditions, including liquids containing minor impurities, high-temperature gases like steam, and corrosive media such as chemical solutions.
● Stable measurement with reliable accuracy: Measurement accuracy typically ranges from ±1% to ±2.5% of full scale (FS), and is minimally affected by fluctuations in fluid flow velocity or changes in medium viscosity. It ensures consistent, stable readings across a wide range of flow rates—from small to large (pipe diameters DN50 to DN2000).
● Flexible installation requirements: Only a straight pipe section of 5–10 times the pipe diameter upstream and 3–5 times downstream is needed—significantly less than the requirement for turbine flowmeters (10D upstream, 5D downstream)—making it more adaptable to limited installation spaces, especially ideal for scenarios with compact pipe layouts.
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● Minimal pressure loss and excellent energy efficiency: The unique "contraction-throat-expansion" structure recovers approximately 90% of the static pressure energy.
● Anti-clogging and wear-resistant with strong adaptability: The inner wall features a smooth surface free of sharp edges or constricted dead zones, making it highly resistant to impurity buildup (such as particles in wastewater or deposits in steam). This design ensures stable performance even under challenging conditions, including liquids containing minor impurities, high-temperature gases like steam, and corrosive media such as chemical solutions.
● Stable measurement with reliable accuracy: Measurement accuracy typically ranges from ±1% to ±2.5% of full scale (FS), and is minimally affected by fluctuations in fluid flow velocity or changes in medium viscosity. It ensures consistent, stable readings across a wide range of flow rates—from small to large (pipe diameters DN50 to DN2000).
● Flexible installation requirements: Only a straight pipe section of 5–10 times the pipe diameter upstream and 3–5 times downstream is needed—significantly less than the requirement for turbine flowmeters (10D upstream, 5D downstream)—making it more adaptable to limited installation spaces, especially ideal for scenarios with compact pipe layouts.
LF19B1 Series Balanced Orifice Flowmeter
The LF19B1 series balanced orifice plate flowmeter is a typical differential-pressure flowmeter, designed for use in conjunction with transmitters and display instruments (or control units). It enables precise measurement of fluid flow and is widely adopted across various industrial sectors due to its simple structure, convenient installation, and reliable operational performance.
Orifice plate flowmeters boast a long history of practical application, backed by extensive experimental data. Their design and manufacturing processes have already been standardized, eliminating the need for actual-flow calibration. Moreover, these flowmeters can handle a wide variety of measured media, accommodate diverse pipe diameters, and operate effectively at temperatures as high as 550°C—and even withstand pressures up to 32 MPa. As such, they remain one of the primary instruments used for flow measurement in industrial automation and control processes.
This product features the following key characteristics:
● The structure is easy to replicate, simple yet sturdy, with stable and reliable performance, and at an affordable price.
● Widely applicable, covering single-phase fluids (liquid, gas, steam), as well as partially immiscible flows. Products are available for pipe diameters and operating conditions—such as temperature and pressure—commonly encountered in industrial processes. Moreover, throttling devices, differential pressure transmitters, and display instruments can be manufactured separately by different suppliers, making large-scale production more convenient.
●The annular chamber and drilled holes enhance measurement accuracy while reducing the minimum required straight pipe length for installation.
● In addition to its online, dynamic full-compensation function, the intelligent orifice flowmeter also features self-diagnosis and automatic range setting.
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● The structure is easy to replicate, simple yet sturdy, with stable and reliable performance, and at an affordable price.
● Widely applicable, covering single-phase fluids (liquid, gas, steam), as well as partially immiscible flows. Products are available for pipe diameters and operating conditions—such as temperature and pressure—commonly encountered in industrial processes. Moreover, throttling devices, differential pressure transmitters, and display instruments can be manufactured separately by different suppliers, making large-scale production more convenient.
●The annular chamber and drilled holes enhance measurement accuracy while reducing the minimum required straight pipe length for installation.
● In addition to its online, dynamic full-compensation function, the intelligent orifice flowmeter also features self-diagnosis and automatic range setting.
LF-19B2 Series Ball-Type Flow Meters
The LF-19B2 series of vane-type flowmeters builds upon the traditional isolated-diaphragm target flowmeter by integrating a new strain sensor into the target design. At the same time, it leverages the latest digital and microelectronic technologies to process the detected sensor signals into a 4–20mA output proportional to the flow rate. The instrument also features dual-row large LCD displays that simultaneously show both instantaneous and cumulative flow rates, significantly enhancing both the structural design and performance of conventional target flowmeters. This model is particularly well-suited for measuring complex fluids with high viscosity, low Reynolds numbers, or those containing suspended particles. Key features of this product include:
● High-temperature and high-pressure resistance: Ranges from -80°C to +200°C, with pressure capacity up to 10 MPa
● Suitable for various diameters: φ15–φ1500mm
● Suitable for measuring highly viscous media containing sediment and sand
● Multiple installation options available: clamp-type, flange-type, threaded-type, insertion-type, detachable insertion-type, sanitary-type, and integrated/segmented designs.
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● High-temperature and high-pressure resistance: Ranges from -80°C to +200°C, with pressure capacity up to 10 MPa
● Suitable for various diameters: φ15–φ1500mm
● Suitable for measuring highly viscous media containing sediment and sand
● Multiple installation options available: clamp-type, flange-type, threaded-type, insertion-type, detachable insertion-type, sanitary-type, and integrated/segmented designs.
LF-19F Series Orifice Flow Meters
The LF-19F series orifice plate flowmeter is a typical differential-pressure flowmeter, designed for use with transmitters and display instruments (or control units). It enables precise measurement of fluid flow and is widely adopted across various industrial sectors due to its simple structure, convenient installation, and reliable operational performance. With a long history of practical application and abundant experimental data, the design and manufacturing of this flowmeter have been standardized, eliminating the need for actual-flow calibration. It supports a wide range of measured media, covers an extensive spectrum of pipe diameters, and can handle measurement temperatures up to 550°C as well as pressures as high as 32 MPa. As such, it remains one of the primary instruments used for flow measurement in industrial automation and control processes. This product boasts the following key features:
● The structure is easy to replicate, simple yet sturdy, with stable and reliable performance, and at an affordable price.
● Widely applicable, covering single-phase fluids (liquid, gas, steam), as well as partially miscible flows. Products are available for pipe diameters and operating conditions—such as temperature and pressure—commonly encountered in industrial processes. Moreover, throttling devices, differential pressure transmitters, and display instruments can be manufactured separately by different suppliers, making it easier to achieve large-scale production.
●The annular chamber and drilled holes enhance measurement accuracy while reducing the minimum required straight pipe length for installation.
● In addition to its online, dynamic full-compensation function, the intelligent orifice flowmeter also features self-diagnosis and automatic range setting.
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● The structure is easy to replicate, simple yet sturdy, with stable and reliable performance, and at an affordable price.
● Widely applicable, covering single-phase fluids (liquid, gas, steam), as well as partially miscible flows. Products are available for pipe diameters and operating conditions—such as temperature and pressure—commonly encountered in industrial processes. Moreover, throttling devices, differential pressure transmitters, and display instruments can be manufactured separately by different suppliers, making it easier to achieve large-scale production.
●The annular chamber and drilled holes enhance measurement accuracy while reducing the minimum required straight pipe length for installation.
● In addition to its online, dynamic full-compensation function, the intelligent orifice flowmeter also features self-diagnosis and automatic range setting.
LYA-R Thermocouple Isolation Safety Barrier
The LYA-R series thermocouple isolation safety barrier primarily serves to receive thermocouple signals from hazardous areas on-site, isolates and converts them, and then transmits the signals to control systems or other combined instruments located in safe areas. It prevents hazardous signals from entering the hazardous environment via the intrinsically safe terminals, while also ensuring electrical, input, and output circuits remain completely isolated from one another.
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LYA-Z Thermal Resistance Isolation Safety Barrier
The LYA-R series thermocouple isolation safety barrier primarily serves to receive thermocouple signals from hazardous areas on-site, isolates and converts them, and then transmits the signals to control systems or other combined instruments located in safe areas. It prevents hazardous signals from leaking back into the hazardous area via the intrinsically safe terminals, while also ensuring complete electrical isolation among the power supply, input, and output circuits.
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LYA-C Operation Terminal Isolation Safety Barrier
The LYA-C series operator-isolated safety barrier primarily functions by receiving the 4–20mA signal from controllers or operators located in the safe area, isolating and converting it before outputting, thereby driving field-mounted actuators. It also prevents hazardous signals from entering the potentially explosive environment via the intrinsically safe terminals, while ensuring complete electrical isolation among the power supply, input, and output circuits.
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Tianjin Ling Yu Technology Co., Ltd.
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Fax: 022-58285528
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Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
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